The present invention relates to a molten iron manufacturing facility and a molten iron manufacturing method, and more particularly, to a molten iron manufacturing facility and a molten iron manufacturing method capable of manufacturing new raw materials by utilizing the gas generated during the molten iron manufacturing.
Background
[2]
Currently, 60% of the world's iron production is produced from the blast furnace operation method. The blast furnace operation method is a method of charging molten iron ore and bituminous coal as raw materials to charge blast furnace together, and blowing oxygen to reduce iron ore to iron to produce molten iron.
[3]
The blast furnace operation method requires a raw material having a strength of a certain level or higher and a particle size capable of ensuring air permeability in the furnace due to its reaction characteristics. Accordingly, coke is used as a carbon source to be used as a fuel and a reducing agent in the manufacturing of molten iron using a blast furnace, and it is mainly dependent on a sintered ore that has undergone a series of bulking processes as an iron source.
[4]
Accordingly, in the current blast furnace operation method, in addition to the blast furnace, raw material pre-treatment facilities such as coke manufacturing facilities and sintering facilities must be accompanied, and also due to the need to install environmental pollution prevention facilities for all environmental pollutants generated in auxiliary facilities. There is a problem in that the manufacturing cost increases rapidly because the investment cost is consumed in a large amount.
[5]
In order to solve the problems of the blast furnace method, steel mills around the world use direct coal as a fuel and a reducing agent, and molten iron is manufactured by directly using a spectral that occupies 80% or more of the world's ore production as an iron source. A lot of effort is being devoted to the development of the seasonal method.
[6]
The apparatus for manufacturing molten iron by the molten-reduction iron method includes a multi-stage flow reduction furnace for reducing powdery iron-containing ores, a molding apparatus for compacting the powdered iron discharged from the flow reduction furnace, coal briquettes and bulk coal (coal) It includes a melting gasifier that burns with oxygen and melts the hot compacted material provided by the combustion furnace to produce molten iron.
[7]
Meanwhile, a part of the high-temperature reduction gas generated in the molten gasifier is used to control the temperature of the high-temperature reduction gas supplied to the flow reduction furnace, and the rest is discharged to the outside to maintain a constant pressure in the molten gasifier. The gas discharged to the outside is referred to as a surplus gas, and in order to keep the pressure of the molten gasifier constant, the amount of the excess gas should be about 10 to 20% of the amount of the hot reducing gas generated in the molten gasifier. . Normally, the surplus gas discharged from the molten gasifier to the outside is discarded or supplied to a power plant to be used for power generation.
[8]
(Prior literature)
[9]
Korean Patent Publication 10-2000-0039376
Detailed description of the invention
Technical challenges
[10]
The present invention provides a molten iron manufacturing facility and a molten iron manufacturing method capable of manufacturing new raw materials by utilizing gas generated during the manufacturing of molten iron.
[11]
The present invention provides a charter manufacturing facility and a method for manufacturing molten iron that can recycle gas generated during the manufacturing of molten iron and reduce the cost of manufacturing chemical raw materials.
Task resolution
[12]
The molten iron manufacturing equipment according to the present invention includes a molten iron manufacturing apparatus having a molten gasifier for melting molten iron to produce molten iron; And a gas treatment device for synthesizing CO and H 2 from the gas discharged from the molten iron manufacturing apparatus to produce a raw material.
[13]
The gas processing apparatus includes: a gas processor that removes impurities from the gas discharged from the molten iron manufacturing apparatus; And a synthesis reactor for synthesizing CO and H 2 in the gas from which impurities have been removed from the gas processor .
[14]
The gas processor includes a cleaning device that removes tar and alkali components from the gas discharged from the molten iron manufacturing apparatus; And a desulfurization device for removing sulfur from the gas provided from the cleaning device.
[15]
And a separator for receiving raw materials and unreacted gas generated in the synthesis reactor and separating the raw materials and unreacted gas.
[16]
And a burner installed in the molten gasifier so as to inject hydrocarbon-containing gas and oxygen into the molten gasifier.
[17]
The burner is installed in the molten gasifier at a height spaced apart from the upper surface of the coal filling layer charged in the molten gasifier.
[18]
The burners are provided in plural, and are arranged in the circumferential direction of the molten gasifier to be spaced apart.
[19]
[20]
Method for manufacturing molten iron according to an embodiment of the present invention is a process of preparing reduced iron and coal; A process of manufacturing molten iron by melting the reduced iron by heat generated during combustion of the coal by charging the reduced iron and coal into a molten gasifier; And a process of synthesizing CO and H 2 in the gas discharged from the molten gasifier to prepare a raw material.
[21]
The process of manufacturing the raw material may include removing impurities from the gas discharged from the molten gasifier; And a process of synthesizing CO and H 2 contained in the gas from which impurities have been removed to prepare a raw material.
[22]
The process of removing the impurities may include removing tar and alkali components from the gas discharged from the molten gasifier; And removing sulfur from the gas from which the tar and alkali components have been removed.
[23]
And separating the raw material produced by the synthesis reaction and unreacted gas.
[24]
In the process of manufacturing the molten iron, hydrocarbon-containing gas and oxygen are blown into the molten gasification furnace to combust the hydrocarbon-containing gas.
[25]
In blowing the oxygen, it is blown in such a way that the molar ratio of the oxygen is 0.6 to 0.7 molar ratio of the number of carbon moles in the hydrocarbon-containing gas.
[26]
The intake flow rate of the hydrocarbon-containing gas is 30% or less of the amount of gas generated by combustion of the coal and reduction of the reduced iron in the molten gasifier in the amount of CO and H 2 gas generated by the hydrocarbon-containing gas and oxygen. Adjust as much as possible.
Effects of the Invention
[27]
According to the embodiments of the present invention, it is possible to produce a chemical raw material of high added value of any one of dimethyl ether, methanol and ethanol by recycling the surplus gas generated in the molten iron manufacturing apparatus. As a result, the economic efficiency of the charter manufacturing facility is greatly improved compared to the prior art, and it is possible to manufacture the chemical raw material at a lower cost than the production of the conventional chemical raw material, thereby securing cost competitiveness.
Brief description of the drawing
[28]
1 is a view conceptually showing the molten iron manufacturing equipment according to an embodiment of the present invention
[29]
FIG. 2 is a view more specifically showing a charter manufacturing facility including a charter manufacturing apparatus, a gas processing device, and a gas supply unit according to an embodiment of the present invention.
Mode for carrying out the invention
[30]
Hereinafter, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only these embodiments allow the disclosure of the present invention to be complete, and the subject of the invention is completely provided to those skilled in the art. It is provided to inform you. The same reference numerals in the drawings refer to the same elements.
[31]
1 is a view conceptually showing a molten iron manufacturing facility according to an embodiment of the present invention. 2 is a view more specifically illustrating a charter manufacturing facility including a charter manufacturing apparatus, a gas processing device, and a gas supply unit according to an embodiment of the present invention.
[32]
Referring to Figure 1, the molten iron manufacturing equipment according to an embodiment of the present invention by using the gas generated during the manufacturing of the molten iron in the molten iron manufacturing apparatus 100 and the molten iron manufacturing apparatus 100 for manufacturing molten iron by melting reduced iron It includes a gas processing apparatus 200 for manufacturing or producing raw materials. In addition, in order to increase the gas content for the production of raw materials, it may include a gas supply for supplying additional gas to the molten iron manufacturing apparatus 100.
[33]
The gas processing apparatus 200 according to the embodiment synthesizes CO and H 2 gas contained in the gas discharged from the molten iron manufacturing apparatus 100 , and chemical raw materials such as dimethyl ether, ethanol, and ethanol in a liquid state Produces one of them.
[34]
Hereinafter, with reference to FIGS. 1 and 2, the molten iron manufacturing apparatus and the gas processing apparatus according to the embodiment of the present invention will be described in more detail.
[35]
Referring to FIG. 2, the apparatus 100 for manufacturing molten iron according to an embodiment includes a plurality of fluidized reduction reactors (10; 11, 12, 13, 14) for reducing powdered iron ore to produce reduced iron (DRI), fluidized reduction furnace (10) Seonghyeon device 30 for producing compacted iron (HCI: hot compacted iron) formed by shaping the reduced iron provided, crushing machine to crush the compacted reduced iron provided from the molding device 30 to a predetermined size ( 33), which is installed in the molten gasifier 40, which melts the crushed reduced iron provided from the crusher 33 to manufacture molten iron, and melts the lumped coal with oxygen to melt molten iron. Burners that provide a heat source (hereinafter, first burner 41), each of which is installed on the upper side of the molten gasifier 40, the first and second charge to charge the reduced iron and coal into the molten gasifier 40 Devices 50a, 50b.
[36]
In addition, the molten iron manufacturing apparatus 100 according to the embodiment is a cyclone (60) for separating the dust from the gas discharged from the molten gasifier 40, one end is connected to the molten gasifier 40, the other end is a cyclone Connected to the (60), the discharge line 61 for discharging the gas generated during the molten iron manufacturing in the molten gas furnace 20, that is, reducing gas to the cyclone 60, one end is connected to the molten gas furnace 40, The other end is connected to the first burner 41, the re-supply line 62 for supplying the reducing gas with the dust removed from the cyclone 60 to the first burner 41, the reduction generated in the molten gasifier 40 In order to supply the gas to the flow reduction furnace 10, the first dust collector 70 for washing and collecting the reducing gas from which dust has been removed from the cyclone 60, one end is connected to the cyclone 60, and the other end is made 1 connected to the dust collector 70 to move the reducing gas discharged from the cyclone 60 to the first dust collector 70 The first dust collection line 71, the first recovery line 72 for supplying the reducing gas cleaned in the first dust collector 70 to the discharge line 61, is mounted on the extension path of the first recovery line 72 The first booster 73 for boosting the reducing gas is branched from the first dust collecting line 71 and connected to the flow reduction furnace 10, and the reduction gas from which dust is removed from the cyclone 60 is flow reduction furnace 10 It includes a reducing gas supply line 42 for supplying.
[37]
In addition, the molten iron manufacturing apparatus 100 according to the embodiment is a second dust collector 80 for cleaning and collecting the gas discharged from the flow reduction furnace 10, one end is connected to the flow reduction furnace 10 and the other end is the second The second dust collecting line 81 connected to the dust collector 80, the carbon dioxide remover 90 for removing carbon dioxide from the gas cleaned through the second dust collector 80, one end is connected to the second dust collector 80 and the other end is carbon dioxide Connected to the remover 90, the cleaning gas moving line 91 for supplying the cleaned gas discharged from the second dust collector 80 to the carbon dioxide remover 90, one end is connected to the carbon dioxide remover 90, the other end And a second recovery line 92 connected to the discharge line 61 to move the gas from which the carbon dioxide has been removed.
[38]
[39]
The flow reduction furnace 10 is a means for reducing iron ore to produce reduced iron, wherein the iron ore used as a raw material may be powder or finely divided iron ore, and auxiliary materials may be added as necessary. In the flow reduction furnace 10, the charged iron ore is reduced while flowing by gas as described above, and for this purpose, the flow reduction furnace 10 may be provided with a gas distribution plate therein.
[40]
A plurality of flow reduction furnaces 10 are provided, and iron ore is reduced while sequentially passing through a plurality of flow reduction reactors 11, 12, 13, and 14. In the embodiment, four flow reduction furnaces (hereinafter, first to fourth flow reduction furnaces 11, 12, 13, and 14) are provided.
[41]
The first flow reduction furnace 11 is a place where iron ore is initially charged, and preheats the iron ore with a reducing gas discharged from the second flow reduction furnace 12. The preheated iron ore is reduced or preliminarily reduced while passing through the second flow reduction reactor 12 and the third flow reduction reactor 13, and the second flow reduction reactor 12 is discharged from the third flow reduction reactor 13 The iron ore is reduced with a reducing gas, and the third flow reduction furnace 13 reduces the iron ore with a reducing gas discharged from the fourth flow reduction furnace 14. And the fourth flow reduction furnace 14 finally reduces the iron ore by the reducing gas discharged from the molten gasification furnace 40.
[42]
A gas conduit through which the reducing gas flows and a raw material conduit (not shown) for moving iron ore and various auxiliary materials are connected to each of the plurality of fluidized reduction furnaces 11, 12, 13, and 14, respectively. The gas conduit is a first gas conduit 21 that supplies the reducing gas of the molten gasification furnace 40 to the fourth flow reduction furnace 14, and the reducing gas of the fourth flow reduction furnace 14 to the third flow reduction furnace ( 13) a second gas conduit (22), a third gas conduit (23), and a second flow reduction reactor (3) for supplying the reducing gas of the third flow reduction reactor (13) to the second flow reduction reactor (12) And a fourth gas conduit 24 for supplying the reducing gas of 12) to the first flow reduction furnace 11.
[43]
In addition, burners 15 and 16 may be installed on the extension paths of the second and third gas conduits 22 and 23, respectively. Burners 15 and 16 inject oxygen into each of the second and third flow reductions 12 and 13, and increase the temperature 12 and 13 of the flow reduction furnace by exothermic reaction by combustion of the reducing gas.
[44]
The gas discharged from the first flow reduction furnace 11 is moved to the second dust collector 80 through the second dust collecting line 81, and the second dust collector 80 cleans the gas by a wet cleaning method. Subsequently, the gas cleaned in the second dust collector 80 is supplied to the carbon dioxide remover 90 through the cleaning gas moving line 91 to remove the carbon dioxide, and then the discharge line 61 through the first recovery line 72 Is supplied with.
[45]
The number of the flow reduction furnace 10 is not limited to the above-described example, and can be variously changed as necessary.
[46]
The molding apparatus 30 includes a reduced iron storage unit 31 for storing the reduced iron in the form of fine powder manufactured in the fourth flow reduction furnace 14, and a molding machine 32 for forming and reducing the finely reduced iron. Here, the molding machine 32 is a molding machine having a pair of rolls installed to face each other, that is, a twin roll type molding machine. Accordingly, when the reduced iron in the powder state is charged between the pair of rolls, the reduced iron massed by extrusion due to rotation of the pair of rolls is produced.
[47]
On the other hand, the reduced iron is charged in the forming apparatus 30 in the flow reduction furnace 10, the high-temperature reducing gas of the flow reduction furnace is moved to the forming apparatus 30 together. Here, since the gas to the flow reduction furnace 10 is a reducing gas generated in the molten gasification furnace 40 to be described later, in other words, the reducing gas of the melting gasification furnace 40 passes through the flow reduction furnace 10 and reduces iron. A part of the movement to the molding apparatus 30 together.
[48]
The molten gasifier 40 melts reduced iron as described above to manufacture molten iron. In order to melt the reduced iron, coal and coal briquettes are charged into the molten gasifier 40, and oxygen is blown under the molten gasifier 40. When the bulk coal is continuously supplied from the top of the molten gasifier 40, a coal filling layer having a constant height is formed therein. The charged coal and coal briquettes are heat sources, and react with the blown oxygen to generate heat, whereby molten iron is melted to produce molten iron. The molten gasification furnace 40 has a dome shape in which the upper space is formed wider than other spaces, and reduced iron, coal briquettes, and coke are charged into the dome portion, that is, above the molten gasification furnace 40.
[49]
After the molten iron produced in the molten gasifier 40 detects the content of the component, the molten iron that satisfies the desired component content is sent to the steelmaking process, and after being subjected to a series of refining processes, it is moved to the steelmaking process to be manufactured as a cast iron.
[50]
The first burner 41 is a means for providing a heat source for melting reduced iron by burning coal, and is mounted on the molten gasifier 40. That is, when the reducing gas and oxygen, which are discharged from the molten gasifier 40 and dust is removed from the cyclone 60, is supplied to the first burner 41, the first burner 41 is transferred to the molten gasifier 40. The supplied coal is burned with oxygen. At this time, molten iron is produced as the generated combustion gas melts the reduced iron supplied to the molten gasification furnace 40.
[51]
The reducing gas generated during melting of the reduced iron in the molten gasifier 40 is discharged to the outside of the molten gasifier 40 through the discharge line 61 and supplied to the cyclone 60. The cyclone 60 removes dust from the reducing gas, and a part of the reducing gas from which the dust is removed is supplied to the first burner 41 through the resupply line. In addition, some other reducing gas from which dust is removed from the cyclone 60 is moved to the first dust collector 70 through the first dust collecting line 71.
[52]
The first dust collector 70 is a device for cleaning the reducing gas from which the dust has been removed, and the first dust collector 70 according to the embodiment cleans the reducing gas by a wet method. Then, the reducing gas wet-cleaned in the first dust collector 70 is boosted through the first recovery line 72 and the first booster 73 and then supplied back to the discharge line 61, and thereafter the reducing gas supply line 42 ) Is supplied to the flow reduction furnace 10.
[53]
The reducing gas supply line 42 supplies the reducing gas discharged from the molten gasification furnace 40 to the fourth flow reduction furnace 14, and the reducing gas supplied to the fourth flow reduction furnace 14 uses iron ore. It is reused as a reducing gas.
[54]
As described above, the reducing gas wet-cleaned in the first dust collector 70 is supplied to the first booster 73 through the first recovery line 72 and boosted, as described above, and then the molten gasifier 40 It is re-supplied to the cyclone (60) connected to. Thereafter, it is re-supplied to the molten gasification furnace 40 or used to increase the temperature of the reducing gas supplied to the reducing gas supply line 42 and supplied to the flow reduction furnace 10.
[55]
On the other hand, in order to control the pressure in the molten gasifier 40, in general, a part of the reducing gas wet-cleaned in the first dust collector 70 is discharged to the outside, which is referred to as a surplus gas. ) Is 10% to 20% of the amount of reducing gas generated.
[56]
The gas generated in the molten gasifier 40 is a reducing gas, and among the reducing gas, excess gas that is not circulated in the molten iron manufacturing apparatus and is discharged to the outside contains CO, H 2 , tar, and alkali components. In an embodiment of the present invention, CO and H 2 are synthesized in a surplus gas to produce chemical raw materials such as dimethyl ether, methanol, and ethanol.
[57]
To this end, in an embodiment of the present invention, a gas processing apparatus 200 is provided to be connected to the first dust collector 70, and raw materials are produced using the excess gas in the gas processing apparatus 200.
[58]
As shown in FIG. 2, the gas processing apparatus 200 according to an embodiment of the present invention includes a gas processor 210 and a gas processor 210 that remove impurities from surplus gas discharged from the molten iron manufacturing apparatus 100. Synthesized or produced in the synthesis reactor 230, synthesis reactor 230 to produce chemical raw materials such as dimethyl ether, methanol, and ethanol by synthesizing H 2 and CO in a surplus gas from which impurities are removed by being connected. It includes a separator 250 for separating the raw material and the unreacted residual material.
[59]
The gas processor 210 includes a first cleaning device 210a for removing tar and alkali components, and a desulfurization device 210b for removing sulfur (S) from surplus gas from which tar and alkali components have been removed in the first cleaning device 210a. ), A second cleaning device 210c for further removing trace impurities from the gas from which sulfur has been removed in the desulfurization device 210b.
[60]
In addition, the gas processing apparatus 200 is installed to connect the first dust collector 70 and the first cleaning device 210a, more specifically, the molten iron manufacturing apparatus 100, and surplus gas cleaned in the first dust collector 70 Tar and alkali are removed from the first cleaning device 210a by connecting the first surplus gas line 220a, the first cleaning device 210a, and the desulfurization device 210b to supply the first cleaning device 210a. A booster installed on the extended paths of the second surplus gas line 220b and the second surplus gas line 220b to supply the surplus gas to the desulfurization device 210b to boost the surplus gas from which tar and alkali components have been removed. (Hereinafter, the second booster 270), the desulfurization device 210b and the second cleaning device 210c are connected to supply surplus gas from which the sulfur is removed from the desulfurization device 210b to the second cleaning device 210c. By connecting the third surplus gas line 220c, the second cleaning device 210c and the synthesis reactor 230, the second cleaning device 210c ), A product produced in the synthesis reactor 230 by connecting the fourth surplus gas line 220d, the synthesis reactor 230 and the separator 250 to supply the surplus gas from which trace impurities have been removed to the synthesis reactor 230 That is, the movement line 240 for supplying the chemical raw material and unreacted material to the separator 250, the first and second separation lines for moving the raw material and the unreacted material separated from the separator 250 to the outside of the separator 250 ( 260a, 260b).
[61]
Since the molten iron manufacturing apparatus 100 manufactures molten iron using coal, surplus gas discharged from the molten iron manufacturing apparatus 100 includes tar, alkali components, sulfur, and the like. Since the tar and alkali components inhibit the synthesis reaction for the production of chemical raw materials, the tar, alkali components, sulfur, and the like are removed using the gas processing apparatus 200 according to the embodiment of the present invention.
[62]
The first cleaning device 210a is a wet cleaning device that removes tar and alkali components from the excess gas by spraying an organic solvent toward the excess gas and dissolving the tar and alkali components in the organic solvent. Here, as the organic solvent, for example, acetone, alcohol, chloroform, and the like can be used.
[63]
[64]
The desulfurization device 210b removes sulfur (S) from the surplus gas from which tar and alkali components have been removed. The sulfur (S) is removed from the excess gas by passing the desulfurization device (210b) according to the embodiment through a desulfurization agent in a powder form capable of adsorbing sulfur (S). The desulfurizing agent may be, for example, ZnO.
[65]
The second cleaning device 210c removes traces of impurities, such as NH 3 , Ni (CO) 4 , Fe (CO) 4, etc., from the surplus gas from which tar, alkali components, and sulfur have been removed. The second cleaning device according to the embodiment may include a filter for passing excess gas except NH 3 , Ni (CO) 4 and Fe (CO) 4 . That is, the second cleaning device 210c according to the embodiment passes the excess gas through the filter, filtering the Ni and Co.
[66]
The synthesis reactor 230 synthesizes CO and H 2 contained in the surplus gas from which tar, alkali components, sulfur, and trace impurities are removed to produce new raw materials. For the synthesis reaction, when the inside of the synthesis reactor 230 is adjusted to a predetermined temperature, for example, 100 ° C to 200 ° C, in the synthesis reactor 230, CO and H 2 in the surplus gas are selected from either of the following reaction formulas 1 and 2 below. One of them is selectively reacted to produce either dimethyl ether or methanol.
[67]
Scheme 1) 3CO + 3H 2- > CO 3 OCH 3 (dimethyl ether) + CO 2
[68]
Scheme 2) CO + 2H 2- > CO 3 OH (methanol)
[69]
In addition, ethanol may be produced in addition to dimethyl ether and methanol.
[70]
As described above, in synthesizing CO and H 2 , a catalyst may be used to improve the reaction rate.
[71]
The catalyst used in the synthesis reactor 230 is preferably replaced periodically to maintain its performance, and the catalyst discharged for replacement in the synthesis reactor 230 can be recycled to the filter of the second cleaning device 210c. have.
[72]
On the other hand, in the synthesis reactor 230, CO and H 2 in the supplied surplus gas are synthesized, but all of the CO and H 2 in the surplus gas supplied into the synthesis reactor 230 may not be synthesized. Thus, in the embodiment of the present invention, a separator 250 is provided to be connected to the synthesis reactor 230, and raw materials produced by a synthetic reaction in the separator 250, for example, dimethyl ether. Methanol or ethanol is separated from unreacted gases CO and H 2 .
[73]
The raw material separated from the separator 250 is transferred to the outside of the separator 250 through the first separation line 260a, and is subjected to a purification process as necessary, and then sold to the place of use. In addition, unreacted CO and H 2 are mixed with the exhaust gas of the flow reduction furnace 10 to the outside of the separator through the second separation line 260b to be utilized as a fuel gas for the power plant.
[74]
[75]
As described above, the gas processing apparatus 200 according to the embodiment of the present invention uses a surplus gas discharged to the outside without circulating the molten iron manufacturing apparatus 100 among the reducing gases generated in the molten gasifier 40 To prepare new chemical raw materials.
[76]
At this time, in order to increase the production amount of the raw material, in the embodiment, a gas supply unit for supplying a gas for manufacturing the raw material to the molten gasification furnace 40 is connected.
[77]
The gas supply unit according to the embodiment blows hydrocarbon-containing gas and oxygen into the molten gasification furnace 40 and burns it. The gas supply unit includes a second burner 300, and hydrocarbon-containing gas and oxygen are blown into the second burner. The second burner 300 is installed on the upper portion of the molten gasification furnace 40, that is, the dome portion, and is preferably installed to be disposed at a position higher than 1.5 m from the uppermost surface of the coal filling layer in the molten gasification furnace 40. This is to prevent the oxygen blown through the second burner 300 from contacting the coal filling layer of the molten gasifier 40. In addition, it is effective that the second burner 300 is provided in a plurality of two or more, it is preferable that the plurality of second burners 300 are spaced apart along the circumferential direction of the dome portion of the molten gasifier 40.
[78]
Hydrocarbon-containing gas, CH 4 , C 2 H 6 and C 3 H 6, there are and the like, more specifically, combustion, such as Scheme 3 to Scheme 6 below is CO and H by the partial combustion reaction 2 is broken or the like.
[79]
Scheme 3) CH 4 + 0.5O 2 = CO + 2H 2
[80]
Scheme 4) C 2 H 6 + O2 = 2CO + 3H 2
[81]
Scheme 5) C 3 H 8 + 1.5O 2 = 3CO + 4H 2
[82]
In an embodiment, natural gas is used as the hydrocarbon-containing gas, but is not limited thereto, and various gases containing hydrocarbons may be applied.
[83]
[84]
In blowing oxygen into the gas supply unit, that is, the second burner 300, it is preferable to blow oxygen so that the molar ratio of oxygen is 0.6 to 0.7 molar ratio of the number of carbon moles in the hydrocarbon-containing gas. This is to ensure that the components in the hydrocarbon-containing gas are decomposed into CO and H 2 or the conversion rate is 90% or more.
[85]
For example, when the molar ratio of oxygen is less than 0.6 molar ratio of the number of carbon moles in the hydrocarbon-containing gas, the components in the hydrocarbon-containing gas may be decomposed into CO and H 2 or the conversion rate may be less than 90%. However, since the content of CO and H 2 in the surplus gas can be increased from when the hydrocarbon-containing gas and oxygen are additionally blown through the second burner 300 , the amount of oxygen injected must be in the above-described range There is no need to satisfy.
[86]
In addition, the intake amount of the hydrocarbon-containing gas is such that the amount of CO and H 2 gas generated by partial combustion of the hydrocarbon-containing gas is 30% or less of the amount of gas generated by combustion and gasification of coal in the molten gasification furnace 40. It is preferably adjusted, and it is more stable to adjust to 25% or less. This means that when the amount of CO and H 2 gas generated by partial combustion of a hydrocarbon-containing gas exceeds 30% of the amount of gas generated by combustion and gasification of coal in the molten gasifier 40, the molten gasifier 40 This is because excessive pressure may increase due to an excessive amount of gas compared to the volume of the dome.
[87]
As described above, in the embodiment of the present invention, as the hydrocarbon-containing gas and oxygen are blown into the molten gasifier 40 through the gas supply unit for combustion, the CO and H 2 contents in the gas discharged from the molten gasifier 40 are Is increased. Accordingly, the CO and H 2 content in the surplus gas discharged from the molten iron manufacturing apparatus 100 or the second dust collector 80 and supplied to the gas treatment apparatus 200 is increased. Thus, since the CO and H 2 contents participating in the synthesis reaction in the synthesis reactor 230 are increased, there is an effect of increasing the amount of chemical raw materials such as dimethyl ether and methanol.
[88]
[89]
Hereinafter, with reference to FIGS. 1 and 2, a method of producing a raw material in a gas processing apparatus using a surplus gas generated from a molten iron manufacturing apparatus will be described. At this time, the contents overlapping with the contents described above are omitted or briefly described.
[90]
For manufacturing molten iron, reduced iron and coal are charged to the dome of the molten gasification furnace 40 through the first charging device 50a and the second charging device 50b. Then, when oxygen is blown in using the inlet and the first burner 41 provided in the lower portion of the molten gasification furnace 40, the charged coal reacts with the blown oxygen to generate heat, and the reduced iron is melted by this heat. As it becomes, molten iron is manufactured. At this time, the amount of oxygen injected from the inlet of the molten gasification furnace 40 may be 76.900 Nm 3 / hr, and the amount of oxygen injected through the first burner may be 12,800Nm 3 / hr.
[91]
When manufacturing molten iron in the molten gasification furnace 40 in this way, natural gas and oxygen, which are hydrocarbon-containing gases, are blown through the second burner 300 installed in the dome of the molten gasification furnace 40. In the embodiment, natural gas is blown at a flow rate of 26,000 Nm 3 / hr and oxygen at 15,385 Nm 3 / hr.
[92]
In the molten gasifier 40 in which the process as described above proceeds, 180 ton / hr of molten iron is manufactured.
[93]
The reducing gas generated during the manufacturing of the molten iron in the molten gasification furnace 40 is removed by dust by the cyclone 60, some of which is supplied to the first burner 41, and the other part of the first dust collector 70 ).
[94]
The reducing gas generated during melting of the reduced iron in the molten gasifier 40 is discharged to the outside of the molten gasifier 40 through the discharge line 61 and supplied to the cyclone 60. The cyclone 60 removes dust from the reducing gas, and a part of the reducing gas from which the dust is removed is supplied to the first burner 41 through the resupply line. In addition, some other reducing gas from which dust has been removed from the cyclone 60 is transferred to the first dust collector through the first dust collecting line 71 or is supplied to the flow reduction furnace 10 through the reducing gas supply line.
[95]
In the first dust collector 70, the reducing gas from which the dust has been removed is cleaned, and some of them are re-supplied to the cyclone 60 connected to the molten gasifier 40 through the first recovery line 72.
[96]
Then, the remaining gas, that is, the surplus gas is supplied to the gas processing apparatus according to the embodiment of the present invention and is used to manufacture chemical raw materials. In an embodiment, as natural gas and oxygen are blown through the second burner 300 into the molten gasifier 40, the contents of CO and H 2 in the surplus gas are increased compared to when they are not blown .
[97]
The surplus gas of 140,000 Nm 3 / hr , which is a part of the surplus gas discharged from the first dust collector 70 , sequentially passes through the first cleaning device 210a and the desulfurization device 210b while removing tar, alkali and sulfur. In addition, the surplus gas from which tar, alkali and sulfur are removed is transferred to the synthesis reactor 230 after removing a small amount of residual impurities in the second cleaning device 210c.
[98]
In the synthesis reactor 230, CO and H 2 contained in the surplus gas are synthesized in a first reaction scheme, for example, and dimethyl ether raw materials are manufactured.
[99]
In addition, dimethyl ether, which is a raw material produced in the synthesis reactor 230, and unreacted gases, that is, CO and H 2 are transferred to a separator and separated. The production amount of dimethyl ether raw material separated from the separator 250 may be 24 ton / hr, and the unreacted gas may be 65,800 Nm 3 / hr.
[100]
As described above, in the embodiment of the present invention, the surplus gas generated in the molten iron manufacturing apparatus 100 may be recycled to produce chemical raw materials having high added value of at least one of dimethyl ether, methanol, and ethanol. As a result, the economic efficiency of the charter manufacturing facility is greatly improved compared to the prior art, and it is possible to manufacture the chemical raw material at a lower cost than the production of the conventional chemical raw material, thereby securing cost competitiveness.
Industrial availability
[101]
According to the charter manufacturing equipment according to the embodiments of the present invention, it is possible to produce a chemical raw material having high added value of any one of dimethyl ether, methanol and ethanol by recycling surplus gas generated in the charter manufacturing apparatus. As a result, the economic efficiency of the charter manufacturing facility is greatly improved compared to the prior art, and it is possible to manufacture the chemical raw material at a lower cost than the production of the conventional chemical raw material, thereby securing cost competitiveness.

WE Claim

[Claim 1]
A molten iron manufacturing apparatus having a molten gasifier for melting molten iron to produce molten iron; And a gas processing device for synthesizing CO and H 2 from the gas discharged from the molten iron manufacturing apparatus to produce a raw material. Charter manufacturing equipment comprising a.
[Claim 2]
The method according to claim 1, The gas processing apparatus, A gas processor for removing impurities from the gas discharged from the molten iron manufacturing apparatus; And a synthesis reactor for synthesizing CO and H 2 in the gas from which impurities have been removed from the gas processor . Charter manufacturing equipment comprising a.
[Claim 3]
The method according to claim 2, The gas processor, A cleaning device for removing tar and alkali components in the gas discharged from the molten iron manufacturing apparatus; And a desulfurization device for removing sulfur from the gas provided from the cleaning device. Charter manufacturing equipment comprising a.
[Claim 4]
The molten iron manufacturing equipment according to claim 2, comprising a separator for receiving raw materials and unreacted gases generated in the synthesis reactor and separating the raw materials and unreacted gases.
[Claim 5]
The molten iron manufacturing equipment according to any one of claims 1 to 4, comprising a burner installed in the molten gasifier to blow hydrocarbon-containing gas and oxygen into the molten gasifier.
[Claim 6]
The molten iron manufacturing facility of claim 5, wherein the burner is installed at the molten gasifier at a height spaced apart from an upper surface of the coal filling layer charged in the molten gasifier.
[Claim 7]
The method of claim 6, wherein the burners are provided in plural, and the molten iron manufacturing facilities are arranged and spaced apart in the circumferential direction of the molten gasifier.
[Claim 8]
A process of preparing reduced iron and coal; A process of manufacturing molten iron by melting the reduced iron by heat generated during combustion of the coal by charging the reduced iron and coal into a molten gasifier; And a process of synthesizing CO and H 2 in the gas discharged from the molten gasifier to produce a raw material. Method for manufacturing a molten iron containing.
[Claim 9]
The method according to claim 8, The process of manufacturing the raw material, The process of removing impurities from the gas discharged from the molten gasifier; And synthesizing CO and H 2 contained in the gas from which impurities have been removed to prepare a raw material; Method for manufacturing a molten iron containing.
[Claim 10]
The method according to claim 9, The process of removing the impurities, The process of removing the tar and alkali components of the gas discharged from the molten gasifier; And removing sulfur from the gas from which the tar and alkali components have been removed. Method for manufacturing a molten iron containing.
[Claim 11]
The method of claim 9, comprising the step of separating the raw material produced by the synthesis reaction and unreacted gas.
[Claim 12]
The method for manufacturing a molten iron according to any one of claims 8 to 11, wherein in the process of manufacturing the molten iron, hydrocarbon-containing gas and oxygen are blown into the molten gasifier to burn the hydrocarbon-containing gas.
[Claim 13]
The method for manufacturing molten iron according to claim 12, wherein in blowing the oxygen, the molar ratio of the oxygen is blown such that it is 0.6 to 0.7 molar ratio of the number of carbon moles in the hydrocarbon-containing gas.
[Claim 14]
The method according to claim 12, The intake flow rate of the hydrocarbon-containing gas is the amount of gas generated by the combustion of the coal and the reduction of the reduced iron in the molten gasifier CO and H 2 gas amount generated by the hydrocarbon-containing gas and oxygen Method of manufacturing molten iron is adjusted to be 30% or less.