Art
[1]The present invention relates to that, and more particularly that the molten iron production facility and method for manufacturing molten iron improve the melting property of the reduced iron on the molten iron production facility and method for manufacturing molten iron.
BACKGROUND
[2]The molten iron manufacturing apparatus is a fluidized-bed reactor for reduction of iron ore, the reduced iron that is, bulk solidifying molding the reduced iron, and melting the reduced iron lump screen including the melter-gasifier to produce the molten iron. For melting of the reduced iron, it reduced iron and the input heat source seonghyeongtan the upper side of the melter-gasifier, and when the injection of oxygen to the lower side, the reduced iron is melted by the softening reaction in each other to produce a molten iron.
[3]However, a high reduction rate, reduced iron containing additives is not delivered to the melt characteristics inferior, and a reducing atmosphere in the melter-gasifier is eokjae a low melting point slag formation. This, and fails to be molten reduced iron occurred, the unmelted reduced iron is lowered, and the lower the melter-gasifier, which is a cause of generating a hot metal chulseon deviation.
[4]Further, in order to prevent unmelted reduced iron occurs, the more increase the temperature of the melter-gasifier, it is caused the problem that the fuel for this increase.
[5]Therefore, as a method for solving such a problem, as in Korea Patent Publication 2000-0039376, by mixing the sludge with the reduced iron produced in the fluidized-bed reactors, such as melting or key, Korea Patent Publication 2003-0054281 in the melter-gasifier, a converter charged into the slag in the melter-gasifier with the reduced iron, a method for producing a high-quality slag into the melter-gasifier.
[6]However, for these methods, since the increase in the amount of slag from the inside the melter-gasifier, there is a problem of increased fuel costs to melt it occurs, it can not have a direct influence on the reduction and melting of the reduced iron, the effect is insufficient.
[7]In addition, these methods in such a way that molded by mainly mixing the sludge or converter slag to the reduced iron, degrade the productivity of the molding device, thereby deteriorating the strength of the compacted reduced iron screen. And if the strength of the reduced iron is low permeability is deteriorated in a molten visible, which degrades the reduced iron-fusible.
[8](Prior Art)
[9]Korea Patent Publication 2000-0039376
Detailed Description of the Invention
SUMMARY
[10]The present invention provides a molten iron manufacturing facility, and the molten iron manufacturing method which can improve the melting property of the reduced iron.
[11]The invention provides separate, without addition of an additive, reduced iron molten hot metal and the molten iron production equipment manufacturing method capable of increasing the inside of the reduced iron.
Problem solving means
[12]The molten iron manufacturing facility according to the invention by reducing the fine iron ores in fluidized-bed reactors for producing reduced iron; It has been provided with the reduced iron from said fluidized-bed reactor, by the injection of oxygen into the melt the reduced iron into the melter-gasifier for producing molten iron; Includes; and naengseon storage bin for storing a naengseon prepared by solidifying a molten iron is manufactured in a melter-gasifier, and wherein, In the naengseon as in the melter-gasifier.
[13]The bulk solidifying molding apparatus by molding the reduced iron produced in the fluidized-bed reactors in;
[14]Located on the upper side of said melter-gasifier, the compacted saving the screen of the reduced iron fed into the feed bin to the melter-gasifier; One end is connected to the molding apparatus, and the other end is connected to a feed line to the feed bin; One end coupled to the naengseon storage bin, the other end naengseon supply line connected to the material supply line; includes.
[15]Comprises a dryer to remove moisture from the naengseon prepared by solidifying the molten iron,
[16]The naengseon stores empty store the dried naengseon.
[17]One end is connected to the molding apparatus, the other end is connected to said dryer, comprises a gas supply line for supplying a carrier gas together when the reduced iron of said reduced flow is moved to the forming apparatus to the drier.
[18]The molten iron manufacturing method according to the invention by reducing the fine iron ores process for producing reduced iron; Bulk solidifying process by molding the reduced iron; And by a massive Chemistry reduced iron charged into the melter-gasifier, comprising the steps of: to melt the reduced iron manufacturing the molten iron; including, and a method to melt the reduced iron, naengseon prepared by solidifying the molten iron produced in the above melter-gasifier It is charged to the melter-gasifier to.
[19]According to contents in the naengseon to the melter-gasifier, it is charged with the seonghyeongtan.
[20]It includes drying process for removing moisture from naengseon prepared by solidifying the molten iron, and the contents of the dried naengseon as in the melter-gasifier.
[21]The naengseon: to put the reduced iron tuipbi of is less than or equal to 0.062 is preferred.
[22]And drying the naengseon using the gas generated when the reduction of the fine iron ores.
[23]According to contents in the naengseon to the melter-gasifier,
[24]Of the molten iron manufactured in the melter-gasifier, it is charged into molten iron in the production cost naengseon naengseon and gyeokoe component made of satisfying the object matter content of the molten iron are mixed.
Effects of the Invention
[25]According to an embodiment of the present invention, by charging the naengseon in the melter-gasifier, it is possible to melt the reduced iron at a temperature lower than the conventional. That is, the lower, the melting point of the reduced iron by naengseon turned on, thereby starting to melt the reduced iron from a temperature lower than the conventional. Therefore, it is possible to prevent problems such as unsubstituted or occurrence of unmelted reduced iron in the melter-gasifier, is minimized, so that the molten iron chulseon deviation intensified due to unmelted reduced iron, instability, and increased fuel costs of the reducing gas circulated.
[26]In addition, since the hot metal components of the gyeokoe molten iron produced in the melter-gasifier to manufacture a naengseon, were charged into a melting gasifier with the reduced iron produced during recycling, there is an effect that the molten iron is reduced cost.
Brief Description of the Drawings
[27]Figure 1 is a view of the molten iron manufacturing apparatus according to an embodiment of the present invention is conceptually
[28]2 is a flowchart illustrating a method for manufacturing molten iron according to an embodiment of the present invention
Mode for the Invention
[29]With reference to the accompanying drawings, the present will be described in more detail in an embodiment of the invention. However, the present invention is not limited to the embodiments set forth herein will be embodied in many different forms, but the embodiment are also the teachings of the present invention to complete, and will fully convey the concept of the invention to those of ordinary skill It will be provided to make known. Same numerals in the drawings refers to the same element.
[30]1 is a view of the molten iron manufacturing apparatus according to an embodiment of the present invention. 2 is a flowchart illustrating a method for manufacturing molten iron according to an embodiment of the invention.
[31]1, the molten iron manufacturing apparatus according to an embodiment of the present invention includes the iron ore fines with a plurality of fluidized-bed reactor (10; 11, 12, 13, 14) for producing a reduced iron (DRI) by reduction with, fluidized-bed reactors ( 10) the screen formed by compacting the fine direct reduced iron supplied reduced iron (HCI in: the melter-gasifier that melts the reduced iron manufacturing the molten iron supplied from the Hot compacted iron) molding apparatus (30), the forming device 30, 20, a melter-gasifier a quantity of naengseon upon temporarily saving the dryer 500, the dried naengseon for drying the produced naengseon by using the molten iron prepared in (20), and the reduced iron melted in the melter-gasifier 20 to the melter-gasifier (20 ) and to include a supply or charged naengseon storage bin 600.
[32]
Further, installed on the upper side of the melter-gasifier 20, and supplies the bulk Chemistry reduced iron in the feed bin (20a), the molding apparatus 30 for charging a compacted Chemistry reduced iron as in the melter-gasifier 20 to the feed bin a feed line (30a), by circulating the reducing gas discharged from the melter-gasifier (20), a cyclone 80, a fluidized-bed reactor for re-supplied to the melter-gasifier or a four fluidized-bed reactors (14) back to ( It is installed on the paths that the discharged off-gas is discharged at 11), and a carbon dioxide remover 70 for removing carbon dioxide from the exhaust gas and supplies it to the cyclone (80).
[33]
2, the molten iron manufacturing method according to an embodiment of the present invention by reducing the fine iron ores melting process (S110), bulk solidifying process by molding the reduced iron (S120), the bulk Chemistry reduced iron for producing direct reduced iron molten iron the include process 140 for loading with the manufacturing process (S130), a process of drying a portion of the produced solidified the produced molten iron naengseon (S140), dried naengseon that reduced iron at the time of melting.
[34]
Hereinafter, with reference to FIG. 1 to FIG. 2, it will be described in detail for the molten iron manufacturing apparatus and manufacturing method according to an embodiment of the invention.
[35]
The fluidized-bed reduction reactor 10 is a means for producing reduced iron by reduction of iron ore, wherein iron ore is used as a raw material may be a powder (powder) or the fine iron ores in the differential state, the additives may be added, if necessary. The fluidized-bed reactor (10) while reducing the sikineunde flow by the iron ores charged as described above, the gas, the fluidized-bed reduction reactor 10 for this purpose may be a gas distribution plate installed therein.
[36]
The fluidized-bed reduction reactor 10 is provided with a plurality of, the iron ore is reduced while the mounting of a plurality of fluidized-bed reactors (11, 12, 13, 14) sequentially. Embodiment are provided with the fluidized-bed reactors with four (the first to fourth the fluidized-bed reactors (11, 12, 13, 14)).
[37]
First the fluidized-bed reactors (11) to preheat iron ore in the reducing gas discharged from the iron ore is charged into the first area, the second flow reduced to 12. The pre-heated iron ore is first the fluidized-bed reactors 12 and the over the course of 13 with three fluidized-bed reactors there is the reduction or pre-reduction, a 2 fluidized-bed reactor 12 is discharged from the third fluidized-bed reactor (13) and reduction of iron ore by the reducing gas, with the three fluidized-bed reactors (13) is reduced to iron by a reducing gas discharged from the fourth fluidized-bed reactor (14). And claim 14 to the fluidized-bed reactor 4 is then the final reduction of iron ore by the reducing gas discharged from the melter-gasifier 20.
[38]
A plurality of fluidized-bed reactors (11, 12, 13, 14)) each of which is a raw material pipe (not shown) for moving the conduit and the gas, iron ore and other additives are reducing gas flowing connection. Gas conduit is a first gas conduit (21), the fourth claim 13 with three fluidized-bed reactors a reducing gas in the fluidized-bed reactors (14) for supplying a reducing gas to claim 14 to a fourth fluidized-bed reactors to the melter-gasifier supply of the second gas conduit 22, the third flow a third gas conduit 23, a 12, a second fluidized-bed reactors for supplying reducing gas in the reducing furnace 13 to the second flow reduced to 12, which a fourth gas conduit 24 for supplying a reducing gas to the fluidized-bed reactors 1 to 11.
[39]
In addition, the second and third gas conduit (22, 23), the burner (15, 16) formed on each of the extended route can be set up. A burner (15, 16) raises the second and third fluidized-bed reactors (12, 13) to the blown oxygen and the temperature 12, 13 of the fluidized-bed reactors to the exothermic reaction by the combustion of the reducing gas, respectively.
[40]
And, the movement through the first fluidized-bed reactor (11) is off-gas exhaust gas conduit (11a), and discharged from, the carbon dioxide is removed while passing through the CO remover 70, the go. And the carbon dioxide is removed, the exhaust gas is supplied to the cyclone 80 is supplied again to the first gas conduit (21) or to the melter-gasifier 20.
[41]
The number of the fluidized-bed reduction reactor 10 is not limited to the example described above, it can be variously changed, if necessary.
[42]
[43]
The molding apparatus 30 comprises a fourth reduced iron storing the reduced iron in a finely divided form produced in the fluidized-bed reactors 14, a storage unit 31, a molding machine 32 for bulk screen by molding the reduced iron derivative. The molding machine is a molding machine, that is, twin roll molding machine comprising a pair of rolls of the installation's face each other. Therefore, when a pair of reduced iron-powder-form between the rolls of the loading, the reduced iron lump screen by extrusion due to the rotation of the rolls of the pair are prepared.
[44]On the other hand, there is in reduced iron is charged into a molding device 30, in the fluidized-bed reduction reactor 10, a high temperature reducing gas of the fluidized-bed reactors is moved together with a molding device (30). The gas to the fluidized-bed reduction reactor 10 is because the reducing gas generated in the melter-gasifier to 20 to be described later, when this in other words, via the reducing gas is a fluidized-bed reactor 10 of the melter-gasifier 20, a reduced iron part moves to the molding device 30 with. Then, the gas moves together with the reduced iron from a fluidized-bed reactor 10 is re-supplied after sikineunde dryer 500. Dried naengseon.
[45]
[46]The melter-gasifier 20 as a means to melt the reduced iron as described above, for the melting of the reduced iron, and the seonghyeongtan and coke charged into the melter-gasifier 20, the injection of oxygen into the inside. At this time, the contents seonghyeongtan and coke as a heat source, and generates heat by reacting with the oxygen blow, resulting in the reduced iron is melted to produce a molten iron. These melter-gasifier 20 is that the upper space is formed as a dome shape wider than the other area, i.e. dome, is charged into the reduced iron, coke and seonghyeongtan upwardly the melter-gasifier 20.
[47]In the melter-gasifier 20, a reducing gas generated during melting of the reduced iron is discharged to the outside is supplied to the cyclone 80, the cyclone 80 is supplied to the reducing gas into the first gas conduit (21) or molten and supplies material in a gasifier (20). The reducing gas flowing through the first gas conduit (21) of claim 4 is supplied to the fluidized-bed reactors (14), a fourth gas is recycled to the reduction of iron ores in the fluidized-bed reactors (14).
[48]The molten iron produced in the melter-gasifier 20 after detecting matter content, satisfying the object matter content of the molten iron is moved by the steel making process after undergoing a series of polishing process is sent to the steel making process, or made of a cast steel, prepared immediately naengseon It is produced in a naengseon sent to the equipment.
[49]On the other hand, in the molten iron produced in the melter-gasifier 20, a component gyeokoe For example, they are disposed of when a large amount of the Si and Si-containing molten iron, typically.
[50]However, in the embodiment of the present invention to solidify the molten iron in components it gyeokoe naengseon production equipment (40) made of a naengseon, and charging them into the melter-gasifier 20.
[51]Naengseon manufacturing facility to solidify the molten iron produced in the melter-gasifier 20 to manufacture a naengseon or pig iron. These naengseon manufacturing facility is a facility for a well-known equipment in the art, it was charged sequentially with a hot metal mold which is moving are arranged in one direction, and cooling the respective molds solidify the molten iron.
[52]Embodiment, by loading a naengseon prepared in naengseon production equipment (40) to the melter-gasifier 20, it is possible to improve the melting property of the reduced iron. In other words, by loading with naengseon the reduced iron and seonghyeongtan sheet entrance to the melter-gasifier 20, the reduced iron is, and so that they can be melted at a temperature lower than the conventional, whereby unmelted a reduced iron is to avoid or minimize have.
[53]To this end, the storage naengseon the dryer 500, the dried naengseon drying the naengseon manufactured in production equipment, and the naengseon storage bin 600 for supplying a predetermined amount in the melter-gasifier 20 is provided.
[54]On the other hand, naengseon includes a, large amount of water as produced is cooled by water injection. If as charged into the melter-gasifier 20 such naengseon, it can adversely affect the operation. Thus, by the naengseon dried in a first dryer 500, prior to charged into the melter-gasifier 20 to remove water.
[55]Dryer 500 according to the embodiment is to dry the naengseon using a gas supplied from the forming apparatus 30. More specifically, the movement the melter-gasifier (20) by-product is fluidized-bed reactor (10) into the furnace feed, fluidized-bed reactors (10) molding apparatus (30) a portion of the gas with the reduced iron in which reduction of iron ore in the after in and, the gases go to forming device 30 is moved to the dryer to dry the naengseon. And the gases to be fed into the dryer 500 may be a dithering ghosting gas.
[56]
For example, the dryer 500 may be a configuration including a gas supply line for spraying or supplying a dither casting (dedusting) gas into the housing, the housing inside the internal space is provided with a capacity of naengseon.
[57]The naengseon dried in a dryer (500) has been stored in naengseon storage bin 600, the reduced iron is supplied a predetermined amount into the melter-gasifier in the melting (20). Embodiment, by supplying the naengseon naengseon storage bin 600 with a feed line (30a), is supplied with a feed bin (20a) with a reduced iron and naengseon. That is, the reduced iron and naengseon are mixed in a feed bin (20a), and the mixture is supplied to the melter-gasifier 20 is, of course, not limited to this, without having to supply the naengseon a raw material supply line (30a), naengseon separately by providing the supply pipe it can be supplied to the melter-gasifier 20.
[58]
Naengseon the general naengseon manufactured in production equipment (40) it includes a generally over 3.5 wt% carbon. Thus, naengseon has a characteristic which is easily melted at a temperature above 1150 ℃. Therefore, when naengseon is charged to the melter-gasifier 20, and begin to melt at temperatures above 1150 ℃, wherein naengseon the carbon is delivered to the reduced iron, to lower the melting point of the reduced iron. As a result, becomes to the melting of the reduced iron in the melter-gasifier 20 is more easily compared with the conventional, so that it is possible to reduced iron is in unmelted state to the melter-gasifier 20 to minimize or prevent the problem of falling to the lower side. Thus, it is possible to avoid problems such as reduced iron unmelted molten iron chulseon deviation intensified due to, instability, and increased fuel costs of the reducing gas circulated.
[59]And, because it does not put a slag or a separate additive to the ring wolcheol as in the prior art, the melter-gasifier 20, it is possible to prevent an increase in fuel cost problem of the slag ratio is increased, preventing the reduced productivity problem in the molding apparatus 30 can do. Further, the deterioration of physical properties such as the strength of the reduced iron of the slag or separate additive it is possible to prevent the problem of deterioration in ventilation properties the melter-gasifier.
[60]Embodiment, according to input line and the cold-reduced iron into the melter-gasifier, naengseon: and In the reduced iron tuipbi (naengseon mass / mass of reduced iron) to be less than 0.062. For example, naengseon: If the reduced iron tuipbi (naengseon mass / mass of reduced iron) exceeds 0.062, it is possible to hot metal cost is rather lifted by the fixed ratio increases.
[61]
[62]Table 1 is a result showing the reduced iron melting result by the process according to the comparative example and an embodiment of the present invention.
[63]TABLE 1
division Naengseon melt beginning temperature Melting start temperature of the reduced iron compacted Chemistry Melting completion temperature
Comparative Example - 1415℃ 1465℃
Example 1175℃ 1300℃ 1395℃
[64]
[65]
Comparative Examples and Examples each was reduced to the reduced iron produced in the molding equipment in a test device to simulate the fluidized-bed reactors, using a high-temperature X-ray visualization device, it was observed melting temperature.
[66]For the experiment, it was charged to the compacting screen reduced iron in a furnace, and the temperature was raised for 4 ℃ / min to 1000 ℃, was maintained at 1000 ℃ for 30 minutes. And, N up to 725 ℃ 2 in the atmosphere, that is also gas of 5% oxidized ℃ from 725 to the end of the reaction, CO 2 was fed to the gas at a flow rate of 5 l / min. Then, the melting behavior was observed in the sample into the cooled reduced iron (50mm) in the coke-filled layer simulating the melter-gasifier to the experimental setup, while warming up to 5 ℃ / min to 1500 ℃, X-ray visualization device. At this time, the case of the embodiment, the case where the position naengseon (20 to 30mm) in the coke packed bed and the upper reduced iron to melt, in the case of the comparative example is a case that is not the position naengseon.
[67]Referring to Table 1, the melting start temperature of the embodiment if it can be confirmed that the reduced iron is about 115 ℃ compared to the comparative example decreased. In addition, there is a reduced iron dropping the melted hot metal to the lower coke filling layer, when the dropping of the molten iron temperature to complete the embodiment it can be seen that over 70 ℃ lower than that of the comparative example. This is because naengseon this is melted at a relatively low temperature of 1150 ℃, this time was of molten naengseon carbon is easy to carburizing reduced iron, so that the melting point of the reduced iron becomes low result, the melting property is improved.
[68]
[69]In this way, in the embodiment of the present invention In the naengseon in the melter-gasifier, it is possible to easily melt the reduced iron at a temperature lower than the conventional. In other words, the lowered melting point of the reduced iron by naengseon turned on, thereby starting to melt the reduced iron from a temperature lower than the conventional. Therefore, it is possible to prevent problems such as in the melter-gasifier is minimized or does not occur in the unmelted reduced iron, so that the molten iron chulseon deviation intensified due to unmelted reduced iron, reduced instability in the gas circulation and increased fuel costs.
[70]In addition, since the hot metal components of the gyeokoe molten iron produced in the melter-gasifier to manufacture a naengseon, were charged into a melting gasifier with the reduced iron produced during recycling, there is an effect that the molten iron is reduced cost.
Industrial Applicability
[71]According to the molten iron manufacturing apparatus according to the embodiments of the present invention, does not occur in the unmelted reduced iron in the melter-gasifier, is minimized, so that the molten iron chulseon deviation intensified due to unmelted reduced iron, increased instability and fuel ratio of the reducing gas circulated and so on for it is possible to prevent the problem. In addition, since the hot metal components of the gyeokoe molten iron produced in the melter-gasifier to manufacture a naengseon, were charged into a melting gasifier with the reduced iron produced during recycling, there is an effect that the molten iron is reduced cost.

Claims
[Claim 1]
Minutes, the fluidized-bed reactors for producing reduced iron by reduction of iron ore; It has been provided with the reduced iron from said fluidized-bed reactor, by the injection of oxygen into the melt the reduced iron into the melter-gasifier for producing molten iron; And naengseon storage for storing a naengseon prepared by solidifying a molten iron is manufactured in a melter-gasifier, and wherein, In the naengseon to empty into the melter-gasifier; The molten iron manufacturing facility which comprises a.
[Claim 2]The method according to claim 1, the bulk solidifying molding apparatus by molding the reduced iron produced in the fluidized-bed reactors in; Located on the upper side of said melter-gasifier, the compacted saving the screen of the reduced iron fed into the feed bin to the melter-gasifier; One end is connected to the molding apparatus, and the other end is connected to a feed line to the feed bin; One end coupled to the naengseon storage bin, and the other end is the raw material supply line to the supply line naengseon; Chartering manufacturing facility that includes.
[Claim 3]The method according to claim 1, the molten iron manufacturing facility including a dryer for removing moisture from the naengseon prepared by solidifying the molten iron, and stores the naengseon storage bin is dried naengseon.
[Claim 4]The method according to claim 3, one end is coupled to the molding apparatus, the other end connected to said dryer, the gas supply line for supplying a carrier gas together when the reduced iron into the fluidized-bed reactors is moved to the forming apparatus to the drier the molten iron manufacturing facility which includes.
[Claim 5]Minute process for producing reduced iron by reduction of iron ore; Bulk solidifying process by molding the reduced iron; And by a massive reduced iron charged into the melter-gasifier screen, and melting the reduced iron process for producing molten iron; , Comprising a molten iron manufacturing method according to melt the reduced iron, it was charged to a naengseon prepared by solidifying a molten iron is manufactured in a melter-gasifier into the melter-gasifier to the.
[Claim 6]The method according to claim 5, the molten iron manufacturing method according to the contents in the naengseon to the melter-gasifier, charging with seonghyeongtan.
[Claim 7]The method according to claim 5, the molten iron manufacturing method comprising a drying step of removing moisture of the prepared by solidifying the molten iron naengseon, and charged to the drying in the naengseon to the melter-gasifier.
[Claim 8]The method according to claim 5, the molten iron manufacturing method, which is input in the naengseon mass relative to the mass of the reduced iron tuipbi is less than or equal to 0.062.
[Claim 9]The system according to claim 7, the molten iron manufacturing method of drying the naengseon using the gas generated when the reduction of the fine iron ores.
[Claim 10]A method according to any one of claim 5 to claim 9, according to contents in the naengseon to the melter-gasifier, the of the molten iron manufactured in the melter-gasifier, prepared by satisfying the object matter content of the molten iron naengseon and component gyeokoe the method for manufacturing a hot metal charge by mixing the naengseon produced in molten iron.