Technical field
[0001]
The present disclosure relates to a gypsum slurry dehydration system for dehydrating gypsum slurry produced as a by-product in a flue gas desulfurization apparatus.
Background technology
[0002]
For example, since the exhaust gas emitted from a combustion engine such as a boiler contains air pollutants such as sulfur oxides (SOx), sulfur oxides are removed from the exhaust gas in the flue gas desulfurization apparatus before being released into the atmosphere. ..
[0003]
As a flue gas desulfurization device, a wet flue gas desulfurization device using a lime gypsum method is widely known. In a wet flue gas desulfurization device, the exhaust gas is brought into contact with a limestone slurry (absorbent liquid), and sulfur oxides (for example, sulfite gas) in the exhaust gas are absorbed by the absorption liquid to remove sulfur oxides from the exhaust gas. It is being removed. Sulfur oxides absorbed in the absorption liquid react with calcium in the absorption liquid to become calcium sulfite, and calcium sulfite is oxidized by the air supplied into the absorption liquid to become gypsum. In a wet flue gas desulfurization device, gypsum slurry (absorption liquid containing gypsum) is produced as a by-product.
[0004]
Patent Document 1 discloses that gypsum slurry extracted from a wet flue gas desulfurization apparatus is solid-liquid separated by a gypsum separator to recover gypsum. More specifically, in Patent Document 1, the filter cloth is movably supported on a belt stretched between drums, and the vapor slurry supplied on the filter cloth is sucked from below the belt to form a filtrate and plaster. A belt-type plaster separator for separating steam, a steam injection nozzle for injecting steam into a gypsum slurry on a filter cloth, and a steam hood for covering the steam injection nozzle are disclosed. The steam injected from the steam injection nozzle heats and removes the water contained in the gypsum slurry on the filter cloth.
Prior art literature
Patent documents
[0005]
Patent Document 1: Japanese Unexamined Patent Publication No. 10-128055
Outline of the invention
Problems to be solved by the invention
[0006]
Conventionally, since measures have not been taken to recover the steam after injection from the steam injection nozzle, the steam injected from the steam injection nozzle may leak from the gap between the steam hood and the filter cloth and fill the room. be. When the room is filled with steam, a sensor such as a photoelectric type may detect the steam and cause a malfunction.
[0007]
In view of the above circumstances, an object of at least one embodiment of the present disclosure is to provide a gypsum slurry dehydration system capable of suppressing the filling of steam into a room in which a gypsum slurry dehydration facility is installed. ..
Means to solve problems
[0008]
The gypsum slurry dehydration system according to this disclosure is
A gypsum slurry dehydration system for dehydrating the gypsum slurry produced as a by-product in the flue gas desulfurization equipment.
A transport device having a transport belt that transports the gypsum slurry on a filter cloth, and
A steam ejection device capable of ejecting drying steam and having a steam ejection unit arranged above the transport belt, and a steam ejection device.
A hood of the steam ejection part that covers the steam ejection part and forms a steam ejection space for ejecting the drying steam between the upper surface of the transport belt and the hood of the steam ejection part.
The steam discharge pipe on the steam ejection part side, one end of which communicates with the opening formed in the hood of the steam ejection part,
It is provided with a suction device provided so as to be connected to the other end side of the steam discharge pipe on the steam ejection part side.
Effect of the invention
[0009]
According to at least one embodiment of the present disclosure, there is provided a gypsum slurry dehydration system capable of suppressing the filling of steam into a room in which a gypsum slurry dehydration facility is installed.
A brief description of the drawing
[0010]
FIG. 1 is a schematic configuration diagram schematically showing an overall configuration of an exhaust gas cleaning system including a gypsum slurry dehydration system according to an embodiment of the present disclosure.
FIG. 2 is a schematic configuration diagram schematically showing an overall configuration of a gypsum slurry dehydration system according to an embodiment of the present disclosure.
FIG. 3 is a schematic configuration diagram schematically showing an overall configuration of a gypsum slurry dehydration system according to an embodiment of the present disclosure.
FIG. 4 is a schematic cross-sectional view schematically showing a cross section along a transport direction of a transport belt near the hood of a steam ejection portion of the gypsum slurry dehydration system according to the embodiment of the present disclosure.
5 is a schematic plan view schematically showing a state in which the vicinity of the hood of the steam ejection portion of the gypsum slurry dehydration system shown in FIG. 4 is viewed from above.
FIG. 6 is a schematic cross-sectional view schematically showing a cross section along a transport direction of a transport belt near a hood of a gypsum slurry supply unit of the gypsum slurry dehydration system according to the embodiment of the present disclosure.
FIG. 7 is a schematic plan view schematically showing a state in which the vicinity of the hood of the gypsum slurry supply unit of the gypsum slurry dehydration system shown in FIG. 6 is viewed from above.
Mode for carrying out the invention
[0011]
Hereinafter, some embodiments of the present disclosure will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present disclosure, but are merely explanatory examples. do not have.
For example, expressions that represent relative or absolute arrangements such as "in a certain direction", "along a certain direction", "parallel", "orthogonal", "center", "concentric" or "coaxial" are exact. Not only does it represent such an arrangement, but it also represents a state of relative displacement with tolerances or angles and distances to the extent that the same function can be obtained.
For example, expressions such as "same", "equal", and "homogeneous" that indicate that things are in the same state not only represent exactly the same state, but also have tolerances or differences to the extent that the same function can be obtained. It shall also represent the existing state.
For example, an expression representing a shape such as a quadrangular shape or a cylindrical shape not only represents a shape such as a quadrangular shape or a cylindrical shape in a geometrically strict sense, but also an uneven portion or chamfering within a range in which the same effect can be obtained. The shape including the part and the like shall also be represented.
On the other hand, the expression "equipped", "includes", or "has" one component is not an exclusive expression that excludes the existence of another component.
Note that the same reference numerals may be given to similar configurations and the description may be omitted.
[0012]
(Exhaust gas cleaning system)
FIG. 1 is a schematic configuration diagram schematically showing the overall configuration of an exhaust gas cleaning system including the gypsum slurry dehydration system according to the embodiment of the present disclosure.
As shown in FIG. 1, the gypsum slurry dehydration system 1 according to some embodiments is mounted on the exhaust gas cleaning system 10. As shown in FIG. 1, the exhaust gas cleaning system 10 is subordinate to, for example, a wet flue gas desulfurization device 20 for desulfurizing exhaust gas discharged from a combustion facility 11 such as an engine or a boiler, and a flue gas desulfurization device 20. The gypsum slurry dehydration system 1 for dehydrating the produced gypsum slurry is provided.
[0013]
The flue gas desulfurization apparatus 20 brings the exhaust gas discharged from the combustion equipment 11 into contact with the absorbing liquid to absorb sulfur oxides (for example, sulfite gas) in the exhaust gas into the absorbing liquid, thereby oxidizing sulfur from the exhaust gas. It is configured to remove objects. In the flue gas desulfurization apparatus 20 using the limestone method, for example, a slurry liquid containing an alkaline component such as a limestone slurry in which limestone is dissolved (dispersed) is used as an absorption liquid, and a gypsum slurry (absorption liquid containing gypsum) is produced as a by-product. To. Although the slurry is not strictly a liquid, it is treated as a liquid in the present specification for convenience.
[0014]
The flue gas desulfurization apparatus 20 includes an absorption tower 20A configured to desulfurize the exhaust gas introduced into the flue gas desulfurization apparatus 20. The absorption tower 20A includes an absorption tower main body 22 configured to internally define an internal space 21 into which the exhaust gas discharged from the combustion equipment 11 is introduced, and an exhaust gas introduction port 23 for introducing the exhaust gas into the internal space 21. And an exhaust gas discharge port 24 for discharging exhaust gas from the internal space 21. Each of the exhaust gas introduction port 23 and the exhaust gas discharge port 24 communicates with the absorption tower main body 22.
[0015]
The internal space 21 is located below the gas-liquid contact portion 21A for bringing the exhaust gas and the absorbed liquid into gas-liquid contact, and is located below the gas-liquid contact portion 21A, and the sulfur oxide (for example, sulfur oxide in the exhaust gas) in the gas-liquid contact portion 21A. , Sulfur oxide gas) is included in the pool portion 21B in which the absorbing liquid that has absorbed the absorption liquid is stored.
[0016]
The exhaust gas discharged from the combustion equipment 11 is introduced into the internal space 21 through the exhaust gas introduction port 23. The exhaust gas guided to the internal space 21 flows while rising in the internal space 21 and is washed by the absorbing liquid when passing through the gas-liquid contact portion 21A, and sulfur oxides and the like in the exhaust gas are removed. The exhaust gas after being washed in the gas-liquid contact portion 21A is discharged to the outside of the absorption tower 20A through the exhaust gas discharge port 24 as purified gas which is the purified exhaust gas. The purified gas discharged to the outside of the absorption tower 20A is discharged into the atmosphere from a chimney (not shown) provided on the downstream side of the exhaust gas discharge port 24 in the flow direction of the purified gas (exhaust gas). As shown in FIG. 1, even if the mist eliminator 25 configured to remove water from the purified gas (exhaust gas) is provided on the downstream side of the gas-liquid contact portion 21A in the flow direction of the purified gas (exhaust gas). good.
[0017]
In the illustrated embodiment, the absorption tower 20A further includes a spraying device 26 arranged at the gas-liquid contact portion 21A. The spraying device 26 is configured to spray an absorbing liquid (limestone slurry) on the exhaust gas passing through the gas-liquid contact portion 21A. The absorbing liquid sprayed from the spraying device 26 comes into contact with the exhaust gas and absorbs and removes sulfur oxides (for example, sulfurous acid gas) contained in the exhaust gas.
[0018]
The spraying device 26 includes a spray pipe 261 extending along a horizontal direction that intersects the flow direction of exhaust gas, and a plurality of spray nozzles 262 provided in the spray pipe 261. As shown in FIG. 1, the spray nozzle 262 has a spray port 263 that sprays the absorbing liquid toward the downstream side in the flow direction of the exhaust gas, that is, upward in the vertical direction. In some other embodiments, the spray nozzle 262 may have a spray port for spraying the absorbing liquid downward in the vertical direction.
[0019]
In the liquid pool portion 21B, the exhaust gas guided to the internal space 21 is sprayed from the spray port 263 of the spray nozzle 262, and the absorbing liquid in which the sulfur oxides contained in the exhaust gas is absorbed and removed falls and is stored. .. The absorbing liquid stored in the pool portion 21B may include sulfites produced by sulfur oxides absorbed from exhaust gas and gypsum (calcium sulfate) produced by oxidation of sulfites.
[0020]
The absorption tower main body 22 is supplied with an absorption liquid outlet 221 for extracting the cleaning liquid stored in the liquid pool 21B to the outside, and an oxidizing gas (for example, air) for the absorption liquid stored in the liquid pool 21B. The nozzle insertion port 222 for inserting the nozzle 271 for inserting the gas is open. Each of the absorption liquid outlet 221 and the nozzle insertion port 222 communicates with the liquid pool portion 21B. Further, the absorption tower main body 22 is opened with an absorption liquid supply port 223 for introducing the limestone slurry and an absorption liquid return port 224 for returning the absorption liquid extracted to the outside to the liquid pool portion 21B. Each of the absorption liquid supply port 223 and the absorption liquid return port 224 communicates with the internal space 21 above the liquid pool portion 21B.
[0021]
The absorption tower 20A further includes an oxidation gas supply device 27 configured to supply an oxidation gas (for example, air) to the absorption liquid stored in the liquid pool 21B. In the illustrated embodiment, the oxidizing gas supply device 27 includes a nozzle 271 inserted through the nozzle insertion port 222 and a pump 272 that supplies the oxidizing gas to the nozzle 271 through a pipe. The oxidizing gas supplied by the pump 272 is supplied from the discharge port 273 at the tip of the nozzle to the absorbing liquid stored in the liquid pool 21B. As a result, the sulfite in the absorbing liquid stored in the pool portion 21B can be oxidized to form gypsum.
[0022]
The absorption tower 20A sends the absorption liquid supply line 12 configured to supply the absorption liquid to the liquid pool portion 21B of the absorption tower 20A and the absorption liquid extracted from the liquid pool portion 21B to the spraying device 26. The absorbed liquid circulating line 13 and the absorbed liquid extracted from the liquid pool portion 21B are sent to the gypsum slurry dehydration system 1.The extraction line 14 and the like are further included. The absorption tower 20A circulates the absorption liquid through the spray device 26, the liquid pool portion 21B, and the absorption liquid circulation line 13. Since the absorbing liquid stored in the liquid pool portion 21B is repeatedly used for cleaning the exhaust gas in the absorbing tower 20A, gypsum is gradually accumulated. By sending the gypsum slurry (absorption liquid containing gypsum) to the gypsum slurry dehydration system 1 via the absorption liquid extraction line 14, the absorption liquid circulation system (spraying device 26, liquid pool 21B, absorption liquid circulation line 13). The plaster is extracted from. In addition, in order to achieve both absorption and removal of sulfur oxides in the exhaust gas by the absorption liquid (higher pH is better efficiency) and oxidation of sulfite in the absorption liquid (lower pH is better efficiency). The absorption liquid is appropriately supplied via the absorption liquid supply line 12 so that the pH of the absorption liquid is in the range of 5 to 6.
[0023]
In the illustrated embodiment, the absorption liquid supply line 12 is arranged outside the absorption tower 20A, and is configured to define an internal space 122 for storing the absorption liquid, and an absorption liquid storage tank 121. One end side is connected to the absorption liquid storage tank 121, and the other end side is connected to the absorption liquid supply port 223. Includes a supply pump 124, which is configured to deliver an absorbent to the end side. By driving the supply pump 124, the absorption liquid is extracted from the internal space 122 and supplied to the liquid pool portion 21B of the absorption tower 20A.
[0024]
In the illustrated embodiment, the absorption liquid circulation line 13 is provided in the absorption liquid circulation pipe 131 in which one end side is connected to the absorption liquid outlet 221 and the other end side is connected to the spray pipe 261 and the absorption liquid circulation pipe 131. In addition, the circulation pump 132 configured to send the absorption liquid from one end side to the other end side of the absorption liquid circulation pipe 131 is included. One end of the absorption liquid extraction line 14 is connected to the first branch portion 133 located on the downstream side (spraying device 26 side) in the flow direction of the absorption liquid from the circulation pump 132 of the absorption liquid circulation pipe 131, and the other end side is plaster. The absorption liquid extraction pipe 141 connected to the slurry dehydration system 1 (specifically, the plaster slurry supply device 4 shown in FIGS. 2 and 3) is included. In this case, the absorption liquid circulation line 13 and the absorption liquid extraction line 14 share the circulation pump 132. By driving the circulation pump 132, the absorbing liquid is extracted from the pool portion 21B and pumped to the spray device 26 and the gypsum slurry dehydration system 1. In some other embodiments, the absorption liquid extraction line 14 may not have a shared portion with the absorption liquid circulation line 13.
[0025]
In the illustrated embodiment, the absorption liquid extraction line 14 further includes a regulating valve 142 provided on the other end side of the absorption liquid extraction pipe 141. The regulating valve 142 has a movable mechanism for opening and closing the absorption liquid extraction pipe 141, which is a flow path of the absorption liquid, and the absorption liquid (gypsum slurry) flowing through the absorption liquid extraction pipe 141 and being supplied to the gypsum slurry dehydration system 1. ) Is configured to be adjustable.
[0026]
The absorption tower 20A further includes an absorption liquid return line 15 for returning the absorption liquid from the absorption liquid extraction line 14 to the liquid pool portion 21B of the absorption tower 20A. One end of the absorption liquid return line 15 is connected to the second branch portion 143 located on the upstream side (first branch portion 133 side) in the flow direction of the absorption liquid from the adjusting valve 142 of the absorption liquid extraction pipe 141, and the other end. Includes an absorbent liquid return pipe 151 whose side is connected to the absorbent liquid return port 224. At least a part of the absorption liquid flowing through the absorption liquid extraction pipe 141 is pumped by the circulation pump 132 and returned to the absorption tower 20A via the absorption liquid return pipe 151. Even when the supply amount of the absorption liquid to the gypsum slurry dehydration system 1 is small, a larger amount of the absorption liquid than the required supply amount to the gypsum slurry dehydration system 1 is flowed through the absorption liquid extraction pipe 141 to absorb the excess liquid. By returning the liquid to the absorption tower 20A via the absorption liquid return pipe 151, the flow velocity of the absorption liquid in the absorption liquid extraction pipe 141 is maintained at a predetermined speed or higher, and the solid content (for example, gypsum slurry) in the absorption liquid (plaster slurry) is maintained. , Gypsum, etc.) can be prevented from settling in the absorption liquid extraction pipe 141.
[0027]
(Gypsum slurry dehydration system)
Each of FIGS. 2 and 3 is a schematic configuration diagram schematically showing the overall configuration of the gypsum slurry dehydration system according to the embodiment of the present disclosure.
The gypsum slurry dehydration system 1 according to some embodiments is configured to dehydrate the gypsum slurry (absorption liquid containing gypsum) sent from the absorption tower 20A via the absorption liquid extraction pipe 141 and separate it into gypsum and a filtrate. Has been done.
[0028]
The gypsum slurry dehydration system 1 includes, for example, as shown in FIGS. 2 and 3, a transport device 3 having a transport belt 32 for transporting the gypsum slurry on the filter cloth 31, and a transport belt 32 for transporting the gypsum slurry. In order to clean the gypsum slurry supply device 4 having the gypsum slurry supply unit 41 capable of supplying the gypsum slurry 31 and the gypsum cake formed on the filter cloth 31 in the process of transporting the gypsum slurry while being dehydrated, the gypsum cake It is provided with a cake cleaning device 5 having a cake cleaning liquid ejection unit 51 capable of ejecting the cake cleaning liquid toward the gypsum cake, and a steam ejection device 6 having a steam ejection unit 61 capable of ejecting drying steam toward the gypsum cake. The gypsum slurry supply unit 41, the cake cleaning liquid ejection unit 51, and the steam ejection unit 61 are arranged above the transport belt 32, respectively. The cake cleaning liquid ejection portion 51 is located on the downstream side (right side in FIGS. 2 and 3) of the gypsum slurry supply portion 41 in the direction along the conveying direction of the transport belt 32, and the steam ejection portion 61 is the cake cleaning liquid ejection portion 51. It is located on the downstream side in the direction along the transport direction of the transport belt 32.
[0029]
In the illustrated embodiment, the transport device 3 is connected to two rotatably supported drums 33 (33A, 33B) and one of the above two drums 33 (eg, 33A). It further includes a motor 34 configured to rotationally drive the drum 33 (33A), and a plurality of guide rollers 35. The transport belt 32 is made of an endless band-shaped rubber member (elastic body), and is rotatably hung on two drums 33 arranged apart from each other along the horizontal direction. Since the transport belt 32 is stretched on the two drums 33, the motor 34 rotationally drives one of the drums 33 (33A) to rotate the other drum 33 (33B) and the transport belt. 32 orbits along the transport direction of the transport belt 32.
[0030]
The filter cloth 31 is provided in an endless band shape, is rotatably hung on a plurality of guide rollers 35, and a part of the filter cloth 31 in the length direction is overlapped on the upper surface 321 of the transport belt 32. The portion of the filter cloth overlapped on the upper surface 321 of the transport belt 32 (hereinafter referred to as the supported portion 311) is supported by the transport belt 32 together with the transport belt 32 so as to travel along the transport direction. Therefore, when the drum 33 (33A) is rotationally driven and the transport belt 32 orbits around, the supported portion 311 of the filter cloth 31 becomes the support portion 322 that supports the supported portion 311 of the transport belt 32 from below. Together, they travel along the above-mentioned transport direction. In certain embodiments, the filter cloth 31 comprises a woven fabric formed by weaving a fibrous formed resin material (eg, polyester, polypropylene, etc.). Also, in some other embodiments, the filter cloth 31 includes a non-woven fabric formed by entwining fibrous resin materials (eg, polyester, polypropylene, etc.).
[0031]
The gypsum slurry supply device 4 is configured to supply the gypsum slurry sent from the absorption tower 20A via the absorption liquid extraction line 14 from the supply unit 41 onto the filter cloth 31 of the transport belt 32. In the illustrated embodiment, the gypsum slurry supply device 4 is connected to the gypsum slurry supply unit 41 (for example, an injection nozzle) and one end side thereof to the other end side of the absorption liquid extraction pipe 141, and the other end side is the gypsum slurry supply unit. It has a pipe 42 connected to 41. In this case, the gypsum slurry is pumped by the circulation pump 132 described above, passes through the pipe 42, and is supplied from the gypsum slurry supply unit 41 onto the filter cloth 31 of the transport belt 32. Strictly speaking, "on the filter cloth 31" means on the upper surface (outer surface) 312 of the supported portion 311 of the filter cloth 31.
[0032]
The gypsum slurry is placed on the filter cloth 31 of the transport belt 32 and dehydrated when it is transported together with the filter cloth 31 by the transport belt 32. The region where the gypsum slurry is dehydrated in the transport device 3 is designated as the dehydration section 36. In the dehydration section 36, the supported portion 311 of the filter cloth 31 is supported by the supported portion 311 of the transport belt 32. Each of the gypsum slurry supply section 41, the cake cleaning liquid ejection section 51, and the steam ejection section 61 is arranged in the region of the dehydration section 36.
[0033]
The filter cloth 31 is breathable, and the transport belt 32 is formed with a plurality of holes for allowing the filtrate to pass through. The gypsum slurry placed on the filter cloth 31 of the transport belt 32 is dehydrated by the filtrate passing through the filter cloth 31 and the transport belt 32 in the dehydration section 36.
[0034]
In the illustrated embodiment, the transport device 3 further includes a dehydrator device 37 configured to dehydrate the filtrate by sucking the gypsum slurry placed on the filter cloth 31 from below. The dehydration device 37 is provided below the support portion 322 of the transport belt 32, and has a dehydration chamber 371 in which the internal pressure is held at a negative pressure (pressure lower than the atmospheric pressure), a vacuum pump 372, and a dehydration chamber 371. Includes a decompression pipe 373 having one end connected to the vacuum pump 372 and the other end connected to the vacuum pump 372, and a vacuum tank 374 provided in the decompression pipe 373. By driving the vacuum pump 372, the dehydration chamber 371 is depressurized to a negative pressure, the water in the gypsum slurry placed on the filter cloth 31 is forcibly sucked from below, and the gypsum slurry is dehydrated.
[0035]
Moisture (filter liquid) sucked by the vacuum pump 372 and sent from the dehydration chamber 371 to the vacuum tank 374 is discharged from the filtrate whose one end is connected to the lower end of the vacuum tank 374 and the other end extends downward. It passes through the pipe 375 and flows down to the liquid storage tank 38.
[0036]
In the illustrated embodiment, the gypsum slurry dehydration system 1 is arranged outside the absorption tower 20A and is configured to define an internal space 381 for storing a liquid containing a filtrate 38. The liquid discharge line 39 configured to send the liquid stored in the liquid storage tank 38 to the wastewater treatment facility 16, and the liquid storage tank 121 using the liquid stored in the liquid storage tank 38 as make-up water. A liquid supply line 54, which is configured to feed the liquid supply line 54, is further provided. Make-up water and limestone are supplied to the absorption liquid storage tank 121 through a line (not shown), and the absorption liquid (limestone slurry) is adjusted in the absorption liquid storage tank 121.
[0037]
In the embodiment shown in FIGS. 2 and 3, the liquid discharge line 39 is connected to a liquid discharge pipe 391 and a liquid discharge pipe 391 having one end connected to the liquid storage tank 38 and the other end connected to the wastewater treatment facility 16. Includes a pump 392 provided. By driving the pump 392, the liquid stored in the liquid storage tank 38 is sent to the wastewater treatment facility 16 via the liquid discharge pipe 391. The liquid sent to the wastewater treatment facility 16 is discharged to the outside of the system after being treated in the wastewater treatment facility 16.
[0038]
In the embodiment shown in FIGS. 2 and 3, the liquid supply line 54 has a liquid supply pipe 541 and a liquid supply pipe 541 having one end connected to the liquid storage tank 38 and the other end connected to the absorption liquid storage tank 121. 542, and the pump 542 provided in the. By driving the pump 542, the liquid stored in the liquid storage tank 38 is sent to the absorption liquid storage tank 121 as make-up water via the liquid supply pipe 541. Limestone is supplied to the absorption liquid storage tank 121 through a line (not shown), and the absorption liquid (limestone slurry) is adjusted in the absorption liquid storage tank 121. The adjusted absorption liquid is sent to the absorption tower 20A via the absorption liquid supply line 12.
[0039]
Placed on filter cloth 31 The gypsum slurry that is transported is dehydrated as it is transported to the transport belt 32 to become a gypsum cake. In the illustrated embodiment, the cake cleaning device 5 has one end connected to the cake cleaning liquid ejection portion 51 (for example, an injection nozzle) and the cake cleaning liquid ejection portion 51, and the other end connected to a cleaning liquid tank (not shown). It has a cake cleaning liquid supply pipe 52 and a pump 53 provided in the cake cleaning liquid supply pipe 52. By driving the pump 53, the cleaning liquid is sent from the cleaning liquid tank to the cake cleaning liquid ejection portion 51, and is ejected from the cake cleaning liquid ejection portion 51 toward the gypsum slurry (gypsum cake) on the filter cloth located below. Impurities are removed from the gypsum slurry (gypsum cake) by washing with a washing liquid. Examples of the cake cleaning liquid include industrial water.
[0040]
In the illustrated embodiment, drying steam is supplied to the steam ejection unit 61 (for example, an injection nozzle) of the steam ejection device 6 from a steam pipe 62 connected to a boiler (not shown), and is located below the steam ejection unit 61. It is ejected toward the plaster slurry on the filter cloth. In the gypsum slurry on the filter cloth 31, the water contained in the gypsum slurry is removed by heating with the steam for drying.
[0041]
In the illustrated embodiment, the gypsum obtained by dehydrating the gypsum slurry on the filter cloth 31 in the dehydration section 36 is located downstream of the dehydration section 36 (for example, the steam ejection section 61) in the transport direction of the transport belt 32. , Removed from the top of the filter cloth 31. The region where the gypsum is removed from the filter cloth 31 in the transport device 3 is referred to as the gypsum discharge portion 43.
[0042]
As shown in FIGS. 2 and 3, for example, the gypsum slurry dehydration system 1 is a filter cloth cleaning liquid capable of ejecting a filter cloth cleaning liquid to the filter cloth 31 on the downstream side of the gypsum discharge portion 43 in the transport direction of the transport belt 32. A filter cloth cleaning device 44 having a ejection portion 45 (for example, an injection nozzle) is further provided. In the illustrated embodiment, the filter cloth cleaning device 44 has one end connected to the filter cloth cleaning liquid ejection portion 45 arranged below the two drums 33 and the filter cloth cleaning liquid ejection portion 45, and the other end portion is not. It has a filter cloth cleaning liquid supply pipe 46 connected to the shown cleaning liquid tank, and a pump 47 provided in the filter cloth cleaning liquid supply pipe 46. By driving the pump 47, the cleaning liquid is sent from the cleaning liquid tank to the filter cloth cleaning liquid ejection portion 45, and is ejected from the filter cloth cleaning liquid ejection portion 45 toward the filter cloth 31. Impurities are removed from the filter cloth 31 by cleaning with a cleaning liquid. Examples of the filter cloth cleaning liquid include industrial water. The filter cloth cleaning liquid is ejected toward at least one of the outer surface and the inner surface of the filter cloth 31.
[0043]
As shown in FIGS. 2 and 3, for example, the gypsum slurry dehydration system 1 is provided on a filter cloth cleaning liquid receiving portion 48 (for example, a tray) and a filter cloth cleaning liquid receiving portion 48 provided below the filter cloth cleaning liquid ejection portion 45. A filter cloth cleaning liquid discharge pipe 49, which is connected to one end side and extends downward on the other end side, is further provided. The filter cloth cleaning liquid ejected from the filter cloth cleaning liquid ejection portion 45 falls onto the filter cloth cleaning liquid receiving portion 48. The filter cloth cleaning liquid that has fallen onto the filter cloth cleaning liquid receiving portion 48 passes through the filter cloth cleaning liquid discharge pipe 49 and flows down to the liquid storage tank 38.
[0044]
The gypsum steam dehydration system 1 according to some embodiments includes, for example, as shown in FIGS. 2 and 3, a transport device 3 having a transport belt 32 for transporting the gypsum slurry in a state of being placed on a filter cloth 31. A steam ejection device 61 capable of ejecting drying steam, which covers the steam ejection device 6 having the steam ejection portion 61 arranged above the transport belt 32, the steam ejection portion 61, and the filter cloth 31. Steam ejection in which one end side 731 communicates with a hood 7 of a steam ejection portion forming a steam ejection space 71 for ejecting drying steam between the upper surface 312 and an opening 72 formed in the hood 7 of the steam ejection portion. It is provided with a steam discharge pipe 73 on the portion side and a suction device 74 (first suction device) provided so as to connect to the other end side 732 of the steam discharge pipe 73 on the steam ejection portion side.
[0045]
The steam ejection space 71 is a space formed between the hood 7 of the steam ejection portion and the upper surface 312 of the filter cloth 31 in the vertical direction. The suction device 74 is configured to generate a suction force for sending gas from one end side 731 to the other end side 732 of the steam discharge pipe 73 on the steam ejection portion side. In the illustrated embodiment, the suction device 74 includes a blower fan (a blower fan on the steam ejection part side) configured to blow a gas.
[0046]
According to the above configuration, the drying steam ejected from the steam ejection portion 61 of the steam ejection device 6 and staying in the steam ejection space 71 is formed in the hood 7 of the steam ejection portion by the suction force generated by the suction device 74. It is sucked into the steam discharge pipe 73 on the steam ejection part side from the opened opening 72. The drying steam sucked into the steam discharge pipe 73 on the steam ejection portion side is sent to the other end side 732 of the steam discharge pipe 73 on the steam ejection portion side by the suction force. By recovering the drying steam staying in the steam ejection space 71 by the steam discharge pipe 73 and the suction device 74 on the steam ejection portion side in this way, the drying steam staying in the steam ejection space 71 is collected by the hood 7 of the steam ejection portion. It is possible to prevent the steam from leaking to the outside of the steam ejection space 71 from the gap between the filter cloth 31 and filling the room in which the dewatering equipment for the gypsum slurry (for example, the transport device 3) is installed.
[0047]
In the illustrated embodiment, the other end side 732 of the steam discharge pipe 73 on the steam ejection part side is configured to communicate with the outdoor space 102 different from the indoor space 101 in which the transport device 3 is arranged. In the embodiment shown in FIGS. 2 and 3, the steam discharge pipe 73 on the steam ejection portion side is provided on the side wall 103 partitioning between the indoor space 101 and the outdoor space 102 arranged adjacent to the indoor space 101. A first pipe insertion hole 104 is formed through which the pipe can be inserted. The steam discharge pipe 73 on the steam ejection portion side is inserted through the first pipe insertion hole 104, the one end side 731 is located in the indoor space 101, and the other end side 732 is located in the outdoor space 102. In this case, since the steam recovered by the suction device 74 can be discharged to the outdoor space 102, it is possible to prevent the indoor space 101 from being filled with steam.
[0048]
In some embodiments, for example, as shown in FIG. 2, the gypsum slurry dehydration system 1 has a gypsum slurry supply device 4 having a gypsum slurry supply unit 41 capable of supplying gypsum slurry on the filter cloth 31 of the transport belt 32. The hood 8 of the gypsum slurry supply section and the hood 8 of the gypsum slurry supply section, which cover the gypsum slurry supply section 41 and form a steam retention space 81 for the steam generated from the gypsum slurry to stay between the gypsum slurry supply section 41 and the upper surface 312 of the filter cloth 31. Connected to the steam discharge pipe 83A (83) on the gypsum slurry supply part side and the other end side 832 of the steam discharge pipe 83A on the gypsum slurry supply part side, in which one end side 831 communicates with the opening 82 formed in the hood 8 of the supply part. It is provided with a suction device 84 (second suction device) provided so as to perform the gypsum.
[0049]
The steam retention space 81 is a space formed between the hood 8 of the gypsum slurry supply section and the upper surface 312 of the filter cloth 31 in the vertical direction. The suction device 84 is configured to generate a suction force for sending gas from one end side 831 to the other end side 832 of the steam discharge pipe 83A. In the illustrated embodiment, the suction device 84 includes a blower fan configured to blow a gas.
[0050]
Generally, the gypsum slurry supplied on the filter cloth 31 of the transport belt 32 by the gypsum slurry supply unit 41 of the gypsum slurry supply device 4 has a high temperature and may generate steam by itself. According to the above configuration, the steam generated from the gypsum slurry on the filter cloth 31 and staying in the steam retention space 81 is an opening formed in the hood 8 of the gypsum slurry supply unit by the suction force generated by the suction device 84. It is sucked into the steam discharge pipe 83A from 82. The steam sucked into the steam discharge pipe 83A is sent to the other end side 832 of the steam discharge pipe 83A by the suction force. By recovering the steam staying in the steam retention space 81 by the steam discharge pipe 83A and the suction device 84 in this way, the steam staying in the steam retention space 81 can be collected from the gap between the hood 8 and the filter cloth 31 of the gypsum slurry supply section. It is possible to prevent the steam from leaking to the outside of the steam retention space 81 and filling the room in which the gypsum slurry dehydration facility is installed.
[0051]
The invention according to the present embodiment can be implemented independently. For example, in a certain embodiment, the gypsum slurry dehydration system 1 includes a steam discharge pipe 83A and a suction device 84, but may not include a steam discharge pipe 73 and a suction device 74 on the steam ejection portion side. In a certain embodiment, the gypsum slurry dehydration system 1 includes a steam discharge pipe 73 and a suction device 74, but may not include a steam discharge pipe 83A and a suction device 84 on the gypsum slurry supply unit side. Further, in a certain embodiment, the gypsum slurry dehydration system 1 includes a steam discharge pipe 73 and a suction device 74, but may not include a hood 8 of a gypsum slurry supply unit, a steam discharge pipe 83A, and a suction device 84. good.
[0052]
In the illustrated embodiment, the other end side 832 of the steam discharge pipe 83A is configured to communicate with the outdoor space 102. In the embodiment shown in FIG. 2, a second pipe insertion hole 105 through which the steam discharge pipe 83A can be inserted is formed in the side wall 103. The steam discharge pipe 83A on the gypsum slurry supply unit side has a second pipe insertion hole 105 inserted, one end side 831 is located in the indoor space 101, and the other end side 832 is located in the outdoor space 102. In this case, since the steam recovered by the suction device 84 can be discharged to the outdoor space 102, it is possible to prevent the indoor space 101 from being filled with steam.
[0053]
In some embodiments, for example, as shown in FIG. 3, the gypsum slurry dehydration system 1 comprises a transfer device 3, a gypsum slurry supply device 4, a steam ejection device 6, a steam ejection hood 7, and steam. A steam discharge pipe 73 on the ejection portion side, a suction device 74, and a hood 8 on the gypsum slurry supply portion are provided. Then, in the gypsum slurry dehydration system 1, one end side 831 communicates with the opening 82 formed in the hood 8 of the gypsum slurry supply part, and the other end side 832 is steam on the steam ejection part side on the upstream side of the suction device 74. A steam discharge pipe 83B (83) on the gypsum slurry supply unit side connected to the discharge pipe 73 is further provided.
[0054]
According to the above configuration, in the steam discharge pipe 83B on the plaster slurry supply part side, the other end side 832 is connected to the steam discharge pipe 73 on the steam discharge part side on the upstream side of the suction device 74, so that the steam discharge part The suction force of the suction device 74 provided on the steam discharge pipe 73 on the side is applied not only to the steam discharge pipe 73 on the steam ejection portion side and the steam ejection space 71, but also to the steam discharge pipe 83B on the gypsum slurry supply portion side and steam retention. It can act on the space 81. By recovering the steam staying in the steam retention space 81 by the steam discharge pipe 83B on the gypsum slurry supply part side, the steam discharge pipe 73 on the steam ejection part side, and the suction device 74, the steam staying in the steam retention space 81 is collected in the gypsum slurry. It is possible to prevent leakage from the gap between the hood 8 and the filter cloth 31 of the supply unit and fill the room in which the gypsum slurry dehydration facility is installed. According to the above configuration, the suction device 74 can recover the drying steam staying in the steam ejection space 71 and the steam staying in the steam retention space 81. Therefore, in the above-described embodiment, the gypsum slurry supply unit side can be recovered. It is possible to omit the suction device 84 provided in the steam discharge pipe 83 of the above, and it is possible to suppress the increase in the cost of the steam recovery equipment.
[0055]
In the illustrated embodiment, the other end side 832 of the steam discharge pipe 83B on the gypsum slurry supply part side is connected to the steam discharge pipe 73 on the steam ejection part side in the interior space 101. In this case, the pipe length of the steam discharge pipe 83B on the gypsum slurry supply part side is shorter than that in the case where the outdoor space 102 is connected to the steam discharge pipe 73 on the steam ejection part side. By shortening the steam discharge pipe 83B on the gypsum slurry supply unit side, the suction force is applied to the steam retention space 81 on the gypsum slurry supply unit side without impairing the suction force generated by the suction device 74.Therefore, the suction device 74 can efficiently suck the steam staying in the steam retention space 81 on the gypsum slurry supply section side together with the steam staying in the steam ejection space 71 on the steam ejection section side.
[0056]
(Hood of steam ejection part)
FIG. 4 is a schematic cross-sectional view schematically showing a cross section along the transport direction of the transport belt near the hood of the steam ejection portion of the gypsum slurry dehydration system according to the embodiment of the present disclosure. FIG. 5 is a schematic plan view schematically showing a state in which the vicinity of the hood of the steam ejection portion of the gypsum slurry dehydration system shown in FIG. 4 is viewed from above. In FIGS. 4 and 5, gypsum slurries (including gypsum cake) are indicated by reference numerals GS.
In some embodiments, the hood 7 of the steam ejection section described above has a longitudinal direction along the width direction (vertical direction in FIG. 5) of the transport belt 32, as shown in FIGS. 4 and 5, for example. It is located on the upstream side (left side in FIG. 4, FIG. 5) of the plate portion 75 and the transport belt 32 from the front plate portion 75 in the direction along the transport direction (direction toward the right side in FIGS. 4 and 5). It includes a rear plate portion 76 having a longitudinal direction along the width direction, and a top plate portion 77 connecting the upper end portion 751 of the front plate portion 75 and the upper end portion 761 of the rear plate portion 76.
[0057]
In the illustrated embodiment, as shown in FIG. 5, the length of each of the front plate portion 75, the rear plate portion 76, and the top plate portion 77 in the longitudinal direction is larger than the length in the width direction of the transport belt 32. It is long and is arranged so as to cross the transport belt 32 above the upper surface 321 of the transport belt 32 and is supported by a support base (not shown). As shown in FIG. 4, each of the front plate portion 75 and the rear plate portion 76 is formed in the shape of a metal plate having a width direction along the vertical direction. The top plate portion 77 is formed in the shape of a metal plate having a width direction along the transport direction. The concave space 71A recessed upward is defined by the inner surfaces of the front plate portion 75, the rear plate portion 76, and the top plate portion 77, respectively.
[0058]
In the illustrated embodiment, the steam pipe 62 is inserted into the insertion hole 771 formed in the top plate portion 77, and the steam ejection portion 61 is arranged in the concave space 71A. Further, an opening 72 is formed in the top plate portion 77, and one end side 731 of the steam discharge pipe 73 is in contact with the upper surface 772 of the top plate portion 77 so as to surround the opening 72. It is fixed to the plate portion 77.
[0059]
According to the above configuration, the hood 7 of the steam ejection portion is formed in the concave space 71A by using the concave space 71A defined by the front plate portion 75, the rear plate portion 76 and the top plate portion 77 as a part of the steam ejection space 71. Since the drying steam can be retained, it is possible to prevent the steam retained in the steam ejection space 71 from leaking to the outside of the steam ejection space 71.
[0060]
In some embodiments, the hood 7 of the steam ejection section is further fitted with a skirt rubber 78A that is attached to the front plate portion 75 and hangs below the lower end portion 752 of the front plate portion 75, for example, as shown in FIG. include.
[0061]
In the illustrated embodiment, the hood 7 of the steam ejection part is further attached with a skirt rubber 78B which is attached to the rear plate portion 76 and hangs below the lower end portion 762 of the rear plate portion 76, as shown in FIG. 4, for example. include. Each of the skirt rubbers 78A and 78B is a flexible rubber member (elastic body), and the length in the longitudinal direction along the width direction of the transport belt 32 is longer than the length in the width direction of the transport belt 32. It is formed in the form of a single sheet. The skirt rubbers 78A and 78B are fixed to the front plate portion 75 and the rear plate portion 76, respectively, by fastening members 79 such as fastening bolts.
[0062]
According to the above configuration, the skirt rubber 78A hanging below the lower end portion 752 of the front plate portion 75 provides a gap between the hood 7 and the filter cloth 31 of the steam ejection portion (specifically, in the front plate portion 75). By narrowing the gap between the lower end of the fixed skirt rubber 78A and the filter cloth 31, the amount of steam leaking from the steam ejection space 71 to the outside can be reduced. Further, since the skirt rubber 78A is attached to the front plate portion 75, the gas facing the filter cloth 31 flows in the steam ejection space 71 along the conveying direction of the conveying belt 32, and is external from the steam ejection space 71. It is possible to suppress leakage to the air.
[0063]
Further, the skirt rubber 78B hanging below the lower end portion 762 of the rear plate portion 76 provides a gap between the hood 7 and the filter cloth 31 of the steam ejection portion (specifically, the skirt rubber fixed to the rear plate portion 76). By narrowing the gap between the lower end of the 78B and the filter cloth 31, the amount of steam leaking from the steam ejection space 71 to the outside can be reduced.
[0064]
In some embodiments, the hood 7 of the steam ejection portion has an opening 72 in which the one end side 731 of the steam discharge pipe 73 communicates with the top plate portion 77, as shown in FIGS. 4 and 5, for example. There is.
[0065]
According to the above configuration, since the opening 72 through which one end side 731 of the steam discharge pipe 73 communicates is formed in the top plate portion 77, the steam staying in the steam ejection space 71 is sucked by the suction device 74. By force, it is sucked into the steam discharge pipe 73 through the opening 72 formed in the top plate portion 77. Since the suction force of the suction device 74 forms an upward gas flow in the steam ejection space 71, a gap (steam ejection portion) between the hood 7 and the filter cloth 31 of the steam ejection portion formed downward is formed. The amount of steam leaking to the outside of the steam ejection space 71 from the gap on the downstream side of the) can be reduced.
[0066]
In some embodiments, the hood 7 of the steam ejection portion is one side of each of the front plate portion 75 and the rear plate portion 76 in the length direction (upper side in FIG. 5) as shown by the alternate long and short dash line in FIG. ), And the end portions of the metal plate-shaped side plate portion 70A (70) connecting the ends of the front plate portion 75 and the rear plate portion 76 on the other side (lower side in FIG. 5) in each length direction. Further includes a metal plate-shaped side plate portion 70B (70) for connecting the two. In this case, since both ends of the concave space 71A in the longitudinal direction (direction along the width direction of the transport belt 32) are covered by the side plate portion 70A and the side plate portion 70B, the amount of steam leaking from the concave space 71A to the outside is increased. Can be reduced.
[0067]
(Gypsum slurry supply section hood)
FIG. 6 is a schematic cross-sectional view schematically showing a cross section along the transport direction of the transport belt near the hood of the gypsum slurry supply unit of the gypsum slurry dehydration system according to the embodiment of the present disclosure. FIG. 7 is a schematic plan view schematically showing a state in which the vicinity of the hood of the gypsum slurry supply unit of the gypsum slurry dehydration system shown in FIG. 6 is viewed from above. In FIGS. 6 and 7, the gypsum slurry is indicated by the reference numeral GS.
[0068]
In some embodiments, the hood 8 of the gypsum slurry supply section has a front plate portion having a longitudinal direction along the width direction (vertical direction in FIG. 7) of the transport belt 32, as shown in FIGS. 6 and 7. The 85 and the front plate portion 85 are located on the upstream side (left side in FIG. 6, FIG. 7) in the direction along the transport direction (direction toward the right side in FIGS. 6 and 7) of the transport belt 32, and in the width direction. A rear plate portion 86 having a longitudinal direction along the above, and a top plate portion 87 connecting the upper end portion 851 of the front plate portion 85 and the upper end portion 861 of the rear plate portion 86 are included.
[0069]
In the illustrated embodiment, as shown in FIG. 7, the length of each of the front plate portion 85, the rear plate portion 86, and the top plate portion 87 in the longitudinal direction is larger than the length in the width direction of the transport belt 32. It is long and is arranged so as to cross the transport belt 32 above the upper surface 321 of the transport belt 32 and is supported by a support base (not shown). As shown in FIG. 6, each of the front plate portion 85 and the rear plate portion 86 is formed in the shape of a metal plate having a width direction along the vertical direction. The top plate portion 87 is formed in the shape of a metal plate having a width direction along the transport direction. The concave space 81A recessed upward is defined by the inner surfaces of the front plate portion 85, the rear plate portion 86, and the top plate portion 87, respectively.
[0070]
In the illustrated embodiment, the pipe 42 is inserted into the insertion hole 871 formed in the top plate portion 87, and the gypsum slurry supply portion 41 is arranged in the concave space 81A. Further, an opening 82 is formed in the top plate portion 87, and one end side 831 of the steam discharge pipes 83 (83A, 83B) is in contact with the upper surface 872 of the top plate portion 87 so as to surround the opening 82, for example, by welding. It is fixed to the top plate portion 87 by joining with or the like.
[0071]
According to the above configuration, in the hood 8 of the gypsum slurry supply portion, the concave space 81A defined by the front plate portion 85, the rear plate portion 86 and the top plate portion 87 is used as a part of the steam retention space 81, and the concave space 81A is used. Since the steam generated from the gypsum slurry can be retained, it is possible to prevent the steam retained in the steam retention space 81 from leaking to the outside of the steam retention space 81.
[0072]
In some embodiments, the hood 8 of the gypsum slurry supply section is further fitted with a skirt rubber 88A that is attached to the front plate portion 85 and hangs below the lower end portion 852 of the front plate portion 85, as shown in FIG. include.
[0073]
In the illustrated embodiment, the hood 8 of the gypsum slurry supply section is further fitted with a skirt rubber 88B that is attached to the rear plate portion 86 and hangs below the lower end portion 862 of the rear plate portion 86, as shown in FIG. include. Each of the skirt rubbers 88A and 88B is a flexible rubber member (elastic body), and the length in the longitudinal direction along the width direction of the transport belt 32 is larger than the length in the width direction of the transport belt 32. It is formed in the form of a long sheet. The skirt rubbers 88A and 88B are fixed to the front plate portion 85 and the rear plate portion 86, respectively, by fastening members 89 such as fastening bolts.
[0074]
According to the above configuration, the gap (specifically, the front plate portion 85) between the hood 8 and the filter cloth 31 of the gypsum slurry supply portion is provided by the skirt rubber 88A that hangs below the lower end portion 852 of the front plate portion 85. By narrowing the gap between the lower end of the skirt rubber 88A fixed to the gypsum and the filter cloth 31, the amount of steam leaking from the steam retention space 81 to the outside can be reduced. Further, since the skirt rubber 88A is attached to the front plate portion 85, the steam facing the filter cloth 31 flows in the steam retention space 81 along the transport direction of the transport belt 32, and is outside the steam retention space 81. It is possible to suppress leakage to the air.
[0075]
Further, a gap (specifically, a skirt fixed to the rear plate portion 86) between the hood 8 and the filter cloth 31 of the gypsum slurry supply portion by the skirt rubber 88B hanging below the lower end portion 862 of the rear plate portion 86. By narrowing the gap between the lower end of the rubber 88B and the filter cloth 31, the amount of steam leaking from the steam retention space 81 to the outside can be reduced.
[0076]
As described above, in some embodiments, the hood 8 of the gypsum slurry supply section has an opening 82 through which one end side of the steam discharge pipe 83 (83A or 83B) communicates, as shown in FIGS. It is formed on the plate portion 87.
[0077]
According to the above configuration, since the opening 82 through which one end side of the steam discharge pipe 83 communicates is formed in the top plate portion 87, the steam staying in the steam retention space 81 can be sucked by the suction device (suction device 74 or suction device). By the suction force generated by 84), the steam is sucked into the steam discharge pipe 83 through the opening 82 formed in the top plate portion 87. Since the suction force of the suction device forms an upward gas flow in the steam retention space 81, steam stays through the gap between the hood 8 and the filter cloth 31 of the gypsum slurry supply unit formed below. The amount of steam leaking to the outside of the space 81 can be reduced.
[0078]
In some embodiments, the hood 8 of the gypsum slurry supply section is one side of each of the front plate portion 85 and the rear plate portion 86 in the length direction (in FIG. 7), as shown by the alternate long and short dash line in FIG. The metal plate-shaped side plate portion 80A (80) connecting the ends of the upper side) and the end portions of the front plate portion 85 and the rear plate portion 86 on the other side (lower side in the middle of FIG. 7) of each in the length direction. Further includes a metal plate-shaped side plate portion 80B (80) that connects the two to each other. In this case, since both ends of the concave space 81A in the longitudinal direction (direction along the width direction of the transport belt 32) are covered by the side plate portion 80A and the side plate portion 80B, the amount of steam leaking from the concave space 81A to the outside is increased. Can be reduced.
[0079]
This disclosure is in the embodiment described above.The present invention is not limited to the above, and includes a modified form of the above-described embodiment and a form in which these forms are appropriately combined.
[0080]
The contents described in some of the above-described embodiments are grasped as follows, for example.
[0081]
1) The gypsum slurry dehydration system (1) according to at least one embodiment of the present disclosure is
A gypsum slurry dehydration system (1) for dehydrating the gypsum slurry produced as a by-product in the flue gas desulfurization apparatus (20).
A transport device (3) having a transport belt (32) for transporting the gypsum slurry on a filter cloth (31).
A steam ejection device (6) having a steam ejection portion (61) capable of ejecting drying steam and having a steam ejection portion (61) arranged above the transport belt (32).
The hood of the steam ejection part (71) that covers the steam ejection portion (61) and forms a steam ejection space (71) for ejecting the drying steam between the filter cloth (31) and the upper surface (312). 7) and
A steam discharge pipe (73) with one end communicating with the opening (72) formed in the hood (7),
A suction device (74) provided so as to be connected to the other end side of the steam discharge pipe (73) is provided.
[0082]
According to the configuration of 1) above, the drying steam ejected from the steam ejection part of the steam ejection device and staying in the steam ejection space is formed in the hood of the steam ejection part by the suction force generated by the suction device (74). It is sucked into the steam discharge pipe (73) through the opened opening. The drying steam sucked into the steam discharge pipe (73) is sent to the other end side of the steam discharge pipe (73) by the suction force. By recovering the drying steam staying in the steam ejection space by the steam discharge pipe (73) and the suction device (74) in this way, the drying steam staying in the steam ejection space is between the hood and the filter cloth of the steam ejection part. It is possible to prevent the steam from leaking to the outside of the steam ejection space from the gap and filling the room in which the dewatering equipment for the gypsum slurry (for example, the transport device 3) is installed.
[0083]
2) In some embodiments, the gypsum slurry dehydration system (1) according to 1) above is
A gypsum slurry supply device (4) having a gypsum slurry supply unit (41) capable of supplying gypsum slurry on a filter cloth (31) of a transport belt (32), and a gypsum slurry supply device (4).
A gypsum slurry supply unit that covers the gypsum slurry supply unit (41) and forms a steam retention space (81) between the filter cloth (31) and the upper surface (312) of the gypsum slurry supply unit (31). Hood (8) and
A steam discharge pipe (83A) with one end communicating with an opening (82) formed in the hood (8) of the gypsum slurry supply section.
Further provided with a suction device (84) provided so as to be connected to the other end side of the steam discharge pipe (83A).
[0084]
Generally, the gypsum slurry supplied from the gypsum slurry supply unit of the gypsum slurry supply device onto the filter cloth of the transport belt has a high temperature and may generate steam by itself. According to the configuration of 2) above, the steam generated from the gypsum slurry on the filter cloth and staying in the steam retention space was formed in the hood of the gypsum slurry supply unit by the suction force generated by the suction device (84). It is sucked into the steam discharge pipe (83A) from the opening. The steam sucked into the steam discharge pipe (83A) is sent to the other end side of the steam discharge pipe (83A) by the suction force generated by the suction device (84). By recovering the steam staying in the steam retention space by the steam discharge pipe (83A) and the suction device (84) in this way, the steam staying in the steam retention space can be collected from the gap between the hood and the filter cloth of the gypsum slurry supply section. It is possible to prevent the steam from leaking to the outside of the steam retention space and filling the room in which the gypsum slurry dehydration facility is installed.
[0085]
3) In some embodiments, the gypsum slurry dehydration system (1) according to 1) above is
A gypsum slurry supply device (4) having a gypsum slurry supply unit (41) capable of supplying gypsum slurry on a filter cloth (31) of a transport belt (32), and a gypsum slurry supply device (4).
A gypsum slurry supply unit that covers the gypsum slurry supply unit (41) and forms a steam retention space (81) between the filter cloth (31) and the upper surface (312) of the gypsum slurry supply unit (31). Hood (8) and
One end side communicates with the opening (82) formed in the hood (8) of the gypsum slurry supply part, and the other end side is upstream from the suction device (74) provided in the steam discharge pipe (73) on the steam ejection part side. On the side, a steam discharge pipe (83B) on the gypsum slurry supply part side connected to the steam discharge pipe (73) on the steam ejection part side is further provided.
[0086]
According to the configuration of 3) above, the steam discharge pipe (83B) on the gypsum slurry supply part side has the other end side steam ejected on the upstream side of the suction device (74) provided on the steam discharge pipe on the steam discharge part side. Since it is connected to the steam discharge pipe (73) on the part side, the suction force of the suction device (74) provided on the steam discharge pipe on the steam ejection part side can be applied to the inside of the steam discharge pipe (73) on the steam ejection part side or steam. It can act not only on the ejection space (71) but also on the steam discharge pipe (83B) on the plaster slurry supply portion side and the steam retention space. Steam staying in the steam retention space by the steam discharge pipe (83B) on the gypsum slurry supply part side, the steam discharge pipe (73) on the steam ejection part side, and the suction device (74) provided on the steam discharge pipe on the steam ejection part side. By collecting the steam, it is possible to prevent the steam staying in the steam retention space from leaking from the gap between the hood and the filter cloth of the gypsum slurry supply section and filling the room where the gypsum slurry dehydration facility is installed. can. According to the above configuration, the suction device (74) provided in the steam discharge pipe on the steam ejection part side causes the drying steam and the gypsum slurry supply part to stay in the steam ejection space in the hood of the steam ejection part. Since the steam staying in the steam retention space can be recovered, it is not necessary to provide a suction device in the steam discharge pipe on the side of the gypsum slurry supply unit, and it is possible to suppress the increase in the cost of the steam recovery equipment.
[0087]
4) In some embodiments, the gypsum slurry dehydration system (1) according to 2) or 3) above.
The hood (8) of the gypsum slurry supply section is
The front plate portion (85) having a longitudinal direction along the width direction of the transport belt (32) and
The rear plate portion (86), which is located upstream of the front plate portion (85) in the direction along the transport direction of the transport belt (32) and has a longitudinal direction along the width direction,
Includes a top plate portion (87) that connects the upper end portion (851) of the front plate portion (85) and the upper end portion (861) of the rear plate portion (86).
[0088]
According to the configuration of 4) above, the hood of the gypsum slurry supply section has a concave space (81A) defined by a front plate portion (85), a rear plate portion (86) and a top plate portion (87) as a steam retention space. Since the steam generated from the gypsum slurry can be retained in the concave space as a part of (81), it is possible to prevent the steam retained in the steam retention space from leaking to the outside of the steam retention space.
[0089]
5) In some embodiments, the gypsum slurry dehydration system (1) according to 4) above.
The hood (8) of the gypsum slurry supply section is
Further includes a skirt rubber (88A) that is attached to the front plate portion (85) and hangs below the lower end portion (852) of the front plate portion (85).
[0090]
According to the configuration of 5) above, the gap between the hood and the filter cloth (31) of the gypsum slurry supply portion is narrowed by the skirt rubber (88A) that hangs below the lower end portion of the front plate portion (85). Therefore, the amount of steam leaking to the outside of the steam retention space through the gap can be reduced. Further, since the skirt rubber (88A) is attached to the front plate portion (85), the steam facing the filter cloth flows in the steam retention space along the transport direction of the transport belt, and is outside the steam retention space. It is possible to suppress leakage to the air.
[0091]
6) In some embodiments, the gypsum slurry dehydration system (1) according to 4) or 5) above.
An opening (82) through which one end side of the steam discharge pipe (83, 83A or 83B) on the gypsum slurry supply portion side communicates is formed in the top plate portion (87).
[0092]
According to the configuration of 6) above, the opening through which one end side of the steam discharge pipe on the gypsum slurry supply portion side communicates is formed in the top plate portion (87), so that the steam staying in the steam retention space (81) can be removed. By the suction force generated by the suction device (suction device 74 or suction device 84), the steam is sucked into the steam discharge pipe on the gypsum slurry supply part side through the opening formed in the top plate part (87). Since the suction force of the suction device forms an upward gas flow in the steam retention space, steam stays through the gap between the hood and the filter cloth (31) of the gypsum slurry supply unit formed downward. The amount of steam leaking to the outside of the space can be reduced.
[0093]
7) In some embodiments, the gypsum slurry dehydration system (1) according to any one of 1) to 6) above.
The hood (7) of the steam ejection part is
The front plate portion (75) having a longitudinal direction along the width direction of the transport belt and
The rear plate portion (76), which is located upstream of the front plate portion (75) in the direction along the transport direction of the transport belt (32) and has a longitudinal direction along the width direction,
Includes a top plate portion (77) that connects the upper end portion (751) of the front plate portion (75) and the upper end portion (762) of the rear plate portion (76).
[0094]
According to the configuration of 7) above, the hood of the steam ejection portion has a concave space (71A) defined by the front plate portion (75), the rear plate portion (76) and the top plate portion (77) as the steam ejection space (71A). Since the drying steam can be retained in the concave space as a part of 71), it is possible to prevent the steam staying in the steam ejection space from leaking to the outside of the steam ejection space.
[0095]
8) In some embodiments, the gypsum slurry dehydration system (1) according to 7) above.
The hood (7) of the steam ejection part is
Further includes a skirt rubber (78A) that is attached to the front plate portion (75) and hangs below the lower end portion (752) of the front plate portion (75).
[0096]
According to the configuration of 8) above, the skirt rubber (78A) hanging below the lower end of the front plate portion (75) narrows the gap between the hood and the filter cloth (31) of the steam ejection portion. The amount of steam leaking to the outside of the steam ejection space (71) through the gap can be reduced. Further, since the skirt rubber (78A) is attached to the front plate portion (75), the steam facing the filter cloth flows along the transport direction of the transport belt (32) in the steam ejection space, and the steam It is possible to suppress leakage to the outside of the ejection space.
[0097]
9) In some embodiments, the gypsum slurry dehydration system (1) according to 7) or 8) above.
An opening (72) through which one end side of the steam discharge pipe (73) on the steam ejection portion side communicates was formed in the top plate portion (77).
[0098]
According to the configuration of 9) above, the opening through which one end side of the steam discharge pipe on the steam ejection portion side communicates is formed in the top plate portion (77), so that the steam staying in the steam ejection space (71) can be removed. By the suction force generated by the suction device (74), the steam is sucked into the steam discharge pipe on the steam ejection part side through the opening formed in the top plate part (77). Since the gas flow upward is formed in the steam ejection space by the suction force of the suction device, the steam ejection space is formed through the gap between the hood and the filter cloth (31) of the steam ejection portion formed below. The amount of steam leaking to the outside can be reduced.
Code description
[0099]
1 Gypsum slurry dehydration system
3 Conveyor device
31 Rofu
311 Supported part
312 Top surface
32 Conveyance belt
321 Top surface
322 Support part
33, 33A, 33B drums
34 Motor
35 Guide roller
36 Dehydration section
37 Dehydrator
371 Dehydration room
372 vacuum pump
373 Decompression piping
374 vacuum tank
375 Filtrate discharge piping
38 Liquid storage tank
381 Internal space
39 Liquid discharge line
391 Liquid discharge distribution tube
392 pump
4 Gypsum slurry supply device
41 Gypsum slurry supply section
42 plumbing
43 Gypsum discharge part
44 Filter cloth cleaning device
45 Filter cloth cleaning liquid ejection part
46 Filter cloth cleaning liquid supply piping
47 pump
48 Filter cloth cleaning liquid receiving part
49 Filter cloth cleaning liquid discharge piping
5 Cake washing device
51 Cake cleaning liquid spouting part
52 Cake cleaning liquid supply piping
53 Pump
54 Liquid supply line
541 Liquid supply piping
542 pump
6 Steam ejection device
61 Steam ejection part
62 Steam piping
7 Steam ejection part hood
71 Steam ejection space
71A concave space
72 opening
73 Steam discharge piping on the steam ejection part side
731 One end side
732 The other end side
74 (first) suction device
75 Front plate
751 Upper end
752 Lower end
76 Rear plate
761 Upper end
762 lower end
77 Top plate
771 Insertion hole
772 Top surface
78A, 78B Skirt rubber
79 Fastening member
8 Gypsum slurry supply section hood
81 Steam retention space
81A concave space
82 opening
83, 83A, 83B Steam discharge piping of gypsum slurry supply section
831 One end side
832 other end side
84 (second) suction device
85 Front plate
851 Upper end
852 Lower end
86 Rear plate
861 Upper end
862 Lower end
87 Top plate
871 Insertion hole
872 top surface
88A, 88B skirt rubber
89 Fastening member
10 Exhaust gas cleaning system
101 Interior space
102 Outdoor space
103 side wall
104 1st pipe insertion hole
105 2nd pipe insertion hole
11 Combustion equipment
12 Absorbent liquid supply line
121 Absorbent liquid storage tank
122 Internal space
123 Absorbent liquid supply piping
124 Supply pump
13 Absorbent liquid circulation line
131 Absorbent liquid circulation piping
132 Circulation pump
133 1st branch
14 Absorbent liquid extraction line
141 plumbing
142 Adjusting valve
143 2nd branch
15 Absorbent liquid return line
151 Absorbent liquid return piping
16 Exhaust gas treatment equipment
20 Flue gas desulfurization device
20A absorption tower
21 Internal space
21A Gas-liquid contact part
21B Liquid pool
22 Absorption tower body
221 Absorption liquid drain outlet
222 Nozzle insertion port
223 Absorbent liquid supply port
224 Absorbent liquid return port
23 Exhaust gas inlet
24 Exhaust gas outlet
25 Mist eliminator
26 Spraying device
261 spray tube
262 spray nozzle
263 Spray port
27 Oxidation gas supply device
271 nozzle
272 pump
273 Discharge port
GS gypsum slurry
The scope of the claims
[Claim 1]
A gypsum slurry dehydration system for dehydrating the gypsum slurry produced as a by-product in the flue gas desulfurization equipment.
A transport device having a transport belt that transports the gypsum slurry on a filter cloth, and
A steam ejection device capable of ejecting drying steam and having a steam ejection unit arranged above the transport belt, and a steam ejection device.
The hood of the steam ejection part that covers the steam ejection part and forms a steam ejection space for ejecting the drying steam between the filter cloth and the upper surface of the filter cloth.
The steam discharge pipe on the steam ejection part side, one end of which communicates with the opening formed in the hood of the steam ejection part,
The first suction device provided so as to be connected to the other end side of the steam discharge pipe on the steam ejection part side, and
Gypsum slurry dehydration system.
[Claim 2]
A gypsum slurry supply device having a gypsum slurry supply unit capable of supplying the gypsum slurry onto the filter cloth of the transport belt, and a gypsum slurry supply device.
The hood of the gypsum slurry supply section that covers the gypsum slurry supply section and forms a steam retention space for the steam generated from the gypsum slurry to stay between the filter cloth and the upper surface of the filter cloth.
The steam discharge pipe on the gypsum slurry supply side, one end of which communicates with the opening formed in the hood of the gypsum slurry supply,
A second suction device provided so as to connect to the other end side of the steam discharge pipe on the gypsum slurry supply unit side, and
The gypsum slurry dehydration system according to claim 1.
[Claim 3]
A gypsum slurry supply device having a gypsum slurry supply unit capable of supplying the gypsum slurry onto the filter cloth of the transport belt, and a gypsum slurry supply device.
The hood of the gypsum slurry supply section that covers the gypsum slurry supply section and forms a steam retention space for the steam generated from the gypsum slurry to stay between the filter cloth and the upper surface of the filter cloth.
One end side communicates with the opening formed in the hood of the gypsum slurry supply part, and the other end side is upstream of the first suction device provided in the steam discharge pipe on the steam ejection part side. The steam discharge pipe on the gypsum slurry supply side connected to the steam discharge pipe on the side,
The gypsum slurry dehydration system according to claim 1.
[Claim 4]
The hood of the gypsum slurry supply section is
The front plate portion having a longitudinal direction along the width direction of the transport belt and
A rear plate portion that is located upstream of the front plate portion in the direction along the transport direction of the transport belt and has a longitudinal direction along the width direction.
The gypsum slurry dehydration system according to claim 2 or 3, further comprising a top plate portion connecting the upper end portion of the front plate portion and the upper end portion of the rear plate portion.
[Claim 5]
The hood of the gypsum slurry supply section is
Skirt rubber that is attached to the front plate and hangs below the lower end of the front plate
The gypsum slurry dehydration system according to claim 4, further comprising.
[Claim 6]
The opening through which the one end side of the steam discharge pipe on the gypsum slurry supply portion side communicates was formed in the top plate portion.
The gypsum slurry dehydration system according to claim 4 or 5.
[Claim 7]
The hood of the steam ejection part is
The front plate portion having a longitudinal direction along the width direction of the transport belt and
A rear plate portion that is located upstream of the front plate portion of the hood of the steam ejection portion in the direction along the transport direction of the transport belt and has a longitudinal direction along the width direction.
Includes a top plate portion that connects the upper end portion of the front plate portion of the hood of the steam ejection portion and the upper end portion of the rear plate portion of the hood of the steam ejection portion.
The gypsum slurry dehydration system according to any one of claims 1 to 6.
[Claim 8]
The hood of the steam ejection part is
A skirt rubber that is attached to the front plate portion of the hood of the steam ejection portion and hangs below the lower end portion of the front plate portion of the hood of the steam ejection portion.
7. The gypsum slurry dehydration system according to claim 7.
[Claim 9]
The opening through which the one end side of the steam discharge pipe on the steam ejection portion side communicates was formed in the top plate portion of the hood of the steam ejection portion.
The gypsum slurry dehydration system according to claim 7 or 8.