WO2016072613A1 - Composite molten iron manufacturing apparatus - Google Patents

Abstract

A composite molten iron manufacturing apparatus is provided. According to the present invention, in a molten iron manufacturing apparatus based on a fluidized reduction furnace and a coal filling type gasification melting furnace and a molten iron manufacturing apparatus based on a molten bath type smelting reduction furnace, while the two molten iron manufacturing apparatuses are coupled to each other by a separate fluidized reduction furnace that is additionally configured, the molten iron manufacturing apparatus based on the fluidized reduction furnace and the coal filling type gasification melting furnace stably produces molten iron using a conventional lead material for metallurgy, and the molten iron manufacturing apparatus based on the molten bath type smelting reduction furnace, which is connected thereto, stably produces molten iron using a conventional low-grade lead material that is inappropriate for metallurgy.

Description

 【Specification】

 [Name of invention]

 Composite molten iron manufacturing equipment 【Technical field】

 The present invention relates to a composite molten iron manufacturing apparatus, and more specifically, in the manufacture of molten iron using the powdery or bulky coal and powdery iron-containing ore directly, a variety of grades and sizes of lead, raw materials can be used directly The present invention relates to a composite molten iron manufacturing apparatus comprising a combination of semi-unggi groups for reducing and dissolving a plurality of iron-containing substances having a form and function.

[Technique to become background of invention]

 At present, about 60% of the world's iron production comes from the blast furnace method developed since the 14th century. The blast furnace method is a method of manufacturing molten iron by reducing iron ore to iron by putting together coke prepared from sintering process and coke made from bituminous coal into a blast furnace.

 As such, the blast furnace method, which is a large scale of the molten iron production apparatus, requires a raw material having a certain level of strength and a particle size capable of ensuring the breathability in the furnace due to its reaction characteristics. The carbon source to be used depends on coke processed with specific raw coal, and the iron source mainly depends on sintered ore which has undergone a series of bulking processes.

 As a result, the current blast furnace method necessarily involves preliminary processing facilities such as coke manufacturing facilities and sintering facilities, and therefore, it is necessary to construct additional facilities other than blast furnaces. Due to the need for the installation of environmental pollution prevention equipment, there is a problem that the investment cost is consumed in large quantities and the manufacturing cost increases rapidly.

In order to solve the problems of the blast furnace method, molten reduction of molten iron is produced by directly using general coal as a fuel and a reducing agent in steel mills around the world, and by directly using spectroscopy that occupies more than 80% of the world's ore production as an iron source. Many efforts are being made to develop the steelmaking method. As an example of the molten iron reduction method, European Patent Publication Nos. 1, 689 and 892 disclose a molten iron manufacturing apparatus which directly uses powdered or bulky coal and powdered iron ore and a method for manufacturing molten iron thereof.

 In the European patent, a molten iron manufacturing apparatus which directly uses powdery or bulky coal and powdery iron-containing ore is a multi-stage flow reduction furnace for reducing and calcining powdery iron-containing ore and secondary raw materials by contacting with a high temperature reducing gas. ; A high temperature compaction apparatus for compacting the reduced iron discharged from the flow reduction furnace to produce a high temperature reduced compacted body; Coal briquettes and bulky coals produced by agglomeration from powdered coals are continuously supplied to form a coal filling layer having a predetermined height therein, and oxygen flows through a plurality of air holes formed at the bottom of the outer wall of the coal stratified layer. And pulverized coal ash is blown, the pulverized coal in the pulverized coal ash and coal filling layer is burned by oxygen, and the hot gas formed by the combustion is produced in the high temperature compaction apparatus as the sensible heat while raising the laminar layer. The molten iron and slag are manufactured by heating, melting and slagging the high-temperature reduced compacted material being charged into the coal packed bed and then being charged into the coal packed bed with the high-temperature reduced compacted material. The coal and slag to be discharged to the outside periodically And a molten gasifier for discharging the hot gas passing through the molten coal packed bed and supplying it to the multi-stage flow reduction reactor as a reducing gas for reducing powdered iron ore; And the like.

In addition, the gas discharged to the multi-stage flow reduction path is compressed through a collector device and then branched and compressed to remove a portion of co ₂ , and then mixed with the high-temperature reducing gas discharged from the molten gasifier to flow the multistage flow. A flue gas reforming circulator is provided to additionally supply reducing gas to the reduction furnace. The gas from which C0 ₂ is removed in the exhaust gas reforming circulator corresponds to the lowermost part of the multi-stage flow reduction reactor and is directly supplied by the reducing gas. Configured to be fed to the front end of the final flow reduction reactor.

The molten iron manufacturing process is carried out by indirect reduction by the reducing gas supplied from the melt gasification in the multi-stage flow reduction reactor of 6C 7 ° of the reduction of iron ore, the remaining 30-40% reduction is the iron ore With high temperature reduction After the production is put into the melt gasifier after indirect reduction by the coal combustion gas rising up the coal bed in the coal bed in the molten gasifier and the carbon component and coal combustion gas in the coal in the coal bed Proceed by direct reduction. ，

 Therefore, in order to smoothly proceed with the reduction of the iron ore, it is important to smoothly contact the high temperature coal combustion gas and the high temperature reducing agglomerate in the reducing gas / ferrous iron ore and melt gasification furnace in the flow reduction furnace.

 The gas / spectral contact in the above-mentioned flow path is considered to be no problem considering the high mixing efficiency of the flow reduction path. However, the contact of the gas / hot reduction compact in the coal packed bed due to the melt gasification is It is influenced by the gas flow distribution in the coal packed bed, and the factor which determines the gas flow distribution is the pore distribution in the coal bed.

 In addition, the pore distribution in the coal packed bed is the molten iron and slag produced by heating, melting and slagging the high-temperature reduced compact and subsidiary materials in the coal packed bed through the coal packed bed and discharged to the bottom of the coal packed bed. It also serves as a decisive factor in maintaining smooth molten iron / slag flow.

 The pore distribution in the coal packed bed is greatly influenced by the high temperature properties of the coal forming the coal packed bed, whereby the rank of coal that can be used in the molten iron manufacturing apparatus is limited. .

 In addition, as described above, in order to discharge molten iron and slag to the outside by melting gasification, the coal packing layer must be filled, and the quantity and flowability of the slag is particularly important among the molten iron and slag. The slag property is determined according to the amount and composition of the gangue in the ore used as a raw material in the molten iron manufacturing apparatus, the quality of the ore that can be used in the molten iron manufacturing apparatus is limited. In addition, when using ore containing a large amount of phosphorous (Posphorous) component according to the high reducing atmosphere in the coal stratified layer, the quality of the molten iron is maintained, such as a problem that contains a large amount of phosphorus component difficult to refine in the molten iron produced In order to do so, there will be restrictions on the raw ore used.

The published data on the actual operation results of the molten iron manufacturing apparatus disclosed in the above-mentioned European Patent Publication Nos. 1, 689, 892 show that the molten iron manufacturing apparatus is considerably The stable ore grades of available ore grades and coals are also increasing compared to the existing blast furnace method, but the ore grades and coal ranks that can be used in the molten iron manufacturing apparatus are reported to be quite limited. It is becoming.

 On the other hand, other examples of the melt reduction steelmaking method is disclosed in US Patent Publication US 6332745B1, US 6379422B1, US 6602321B1 and the like.

 The molten iron manufacturing apparatus in the US patent is a molten iron (mol len bath) reactor consisting of a molten iron layer, a slag layer formed on the molten iron layer and a gas layer formed on the slag layer; A secondary combustion lance formed from an upper portion of the molten bath type reaction vessel to an upper portion of the slag layer and configured to blow high temperature hot air enriched with oxygen into the slag layer; Through the molten bath reactor side portion and through the slag layer in the molten bath type reactor, the molten iron layer formed above the slag layer, that is, to the slag layer / molten iron layer boundary point is formed, such as coal and spectroscopy at the boundary point. A powdered coal blowing lance and a spectroscopic stone blowing lance configured to be blown separately from the outside; A pre-reduction furnace formed to preheat / pre-reduce the spectroscopy blown into the melt bath reactor using a portion of the hot gas discharged from the melt bath reactor; A scrubber for cooling / cleaning the gas discharged from the preliminary reduction path; A scrubber for entangling / cleaning the exhaust gas to the remaining molten bath reactor except for the gas supplied to the preheater; And a hot blast furnace provided to form the hot blast supplied through the secondary combustion lance.

 In the molten iron manufacturing apparatus, the reduction of iron ore proceeds in a molten state in a molten bath formed in a molten bath type reaction vessel, and for this, coal, which is a reducing agent required for the reduction, is supplied into the molten bath, and the heat required for the reduction is In the molten bath, the gas generated by the reduction reaction of iron ore and coal is supplied as the combustion generated by burning the oxygen-enriched air hot air supplied from the secondary combustion lance, that is, the heat generated in the secondary combustion.

As the combustion and oxidizing gas is used as the air hot air, the reducing power of the hot gas discharged from the molten bath-type reactor and supplied to the preliminary reduction reactor is very low, and the ore proceeding in the preliminary reduction reactor is reduced. Is limited to 20% or less. The ores and coals mentioned above are rapidly melted and reacted in the molten bath. It is pulverized to 1 kPa or less so that it can proceed. The molten iron and slag produced by the reaction are discharged continuously or periodically through separate outlets. The molten iron manufacturing apparatus is all the reaction and molten iron / slag discharge is made in the molten state, compared to the molten iron manufacturing apparatus disclosed in the above-mentioned European Patent Publication No. 1, 689, 892 described above for the quality of coal and ore There are very few limitations, and as described above, the melting and reducing reactions are performed simultaneously, and the secondary combustion is actively utilized, so the thermal efficiency is considered to be very high.

 However, in the published data on the actual operation results of the apparatus for manufacturing molten iron disclosed in US Patent Publication No. US 6332745B1 and the like, various equipment problems and operational problems have been reported.

 The problem that most affects the operation rate and productivity in the above problems is that the linking operation of the preliminary reduction reactor connected to the "melt bath type | mold reactor" is not performed smoothly, which is the secondary combustion in the melt bath type reactor. The temperature and properties of the generated gas are unstable, and thus fluctuations in ore temperature and reduction reaction in the preliminary reduction furnace using the gas are severe. It is reported that the characteristics are changed, and thus a vicious cycle in which the ore melt reduction reaction and the secondary combustion reaction are unstable in the melt bath reactor is reported.

 In addition, even when the linkage operation is temporarily smooth, the reduction rate of the preliminary reduction ore supplied from the preliminary reduction reactor to the melt bath reactor is too low, and the consumption of coal required for the molten reduction of the preliminary reduction ore is too high compared to the target. Iron slag oxide concentration in the molten bath reactor is too high has been reported to cause problems of excessive erosion of the molten bath reactor refractory material.

 Various methods for solving the above problems are applied, but the improvement effect is insignificant, and it is reported that the economic efficiency is lowered due to the decrease in thermal efficiency and reaction efficiency.

As described above, the development of the molten iron and steel manufacturing methods according to the molten iron and steel manufacturing methods has been reported one after another. Technical We have reached a level where we can identify performances.

 Therefore, in order to maximize the advantages of the respective apparatuses for manufacturing molten iron, a complex molten iron manufacturing process (apparatus) that combines a plurality of molten iron manufacturing processes (apparatuses) by applying a new intermediate process (apparatus) is required. .

[Content of invention]

 Problem to be solved

 The present invention combines the above-described flow reduction furnace and the coal-layered molten gasifier-based molten iron manufacturing apparatus and the molten bath-type molten reduction reactor-based molten iron production apparatus through the flow reduction reactor further comprising the two molten iron manufacturing apparatus. The present invention relates to a new apparatus for manufacturing molten iron, and more particularly, to a molten iron manufacturing apparatus based on a flow reduction reactor and a coal stratified melt gasification furnace, and a molten iron manufacturing apparatus based on a molten bath type molten reduction reactor. In addition, by combining a separate flow reduction reactor configured as a medium, in the molten iron production apparatus based on the flow reduction reactor and the coal-layered molten gasification furnace, using the conventional metallurgical lead, raw materials stably produce the molten iron and connected to the In the molten iron-type molten reduction furnace-based molten iron manufacturing apparatus, low grades that are not suitable for conventional metallurgy It is to provide a composite molten iron manufacturing apparatus that can stably produce molten iron using lead and raw materials.

In addition, the present invention is a mediated flow reduction furnace further comprising the two molten iron manufacturing apparatus in the molten iron manufacturing apparatus and the molten bath-type molten reduction furnace-based molten iron manufacturing apparatus based on the above-described flow reduction reactor and coal bed. The present invention relates to a new apparatus for producing molten iron which is combined with a furnace, and more specifically, to a molten iron manufacturing apparatus based on the flow reduction reactor and a coal-filled melt gasifier, a co ₂ component included in the final by-product gas of the molten iron manufacturing apparatus. Extract partly and remove it, raise it to high temperature reducing gas, supply it to a multistage flow reduction reactor configured separately, and reduce and sinter the spectroscopy and subsidiary materials to a predetermined level in the multistage flow reduction reactor, respectively. It is possible to prepare a branch reducing body and supply it to the apparatus for manufacturing molten iron based on the melt bath-type melt reduction reactor. By configuring so that the molten bath-type melt reduction reactor can be operated stably, in the molten iron manufacturing apparatus based on the flow reduction furnace and coal-filled melt gasification furnace advanced fuel, In the molten iron-type molten reduction furnace-based molten iron production apparatus connected to this and stably producing molten iron using a raw material to provide a composite molten iron production apparatus capable of stably producing molten iron using low-grade lead, raw materials.

 [Measures of problem]

According to one embodiment of the present invention, a plurality of high-temperature compaction process for producing the reduced-reduced iron from the first flow reduction furnace composed of a multi-stage, reducing the spectroscopic to convert to reduced-reduction iron, discharge iron from the first flow reduction reactor Apparatus, a conveying apparatus for conveying the shredded high temperature reduced compacted material to a predetermined size, a compacted material charging apparatus for continuously supplying the high temperature reduced compacted material transported by the conveying apparatus to a molten gasifier, and melting the bulky coal By using the high-temperature combustion gas generated by burning the bulky coal charging device for continuous supply to the gasification furnace, the bulky coal supplied from the bulky coal charging device and the pulverized coal ash blown from the lower part with oxygen Melting the high-temperature reduced compacted material supplied from the compacted material charging device and also required for spectroscopic reduction in the above U flow reduction reactor. Is a melt gasification furnace for supplying a reducing gas, and branching a part of the exhaust gas of the first flow reduction reactor to remove C0 ₂ and then supplying reducing gas to the crab flow reactor in addition to the reducing gas supplied from the melt gasification furnace. C0 ₂ removal apparatus, a dust circulator for separating dust contained in the reducing gas generated in the melt gasifier and re-injected into the melt gasifier, generated in the melt gasifier according to the pressure fluctuation of the melt gasifier A pressure control device for maintaining a constant pressure in the molten gasifier by discharging the gas to a byproduct gas line after partially branching the gas, and a first sensible heat recovery device for recovering sensible heat of the exhaust gas discharged from the first flow reduction reactor ， First gun for separating fugitive dust contained in exhaust gas discharged from the first flow reduction reactor Cyclones, and 1 to an apparatus for manufacturing molten iron including a first gas is nyaenggak nyaeng Sir apparatus for exhaust gas discharged from the fluidized-bed reactor to the first;

An iron bath-type molten reduction furnace, which is made of molten iron and slag and reacts with pulverized iron-containing material and pulverized coal, which are blown into the inside, and is discharged to the outside through reaction such as combustion and melt reduction, and as an oxidant for secondary combustion in the molten reduction furnace. A second molten iron manufacturing apparatus including a hot blast furnace for producing hot air blown in, and a cleaning device for engraving and cleaning the gas discharged from the melt reduction reactor; and The crab molten iron is provided between the first molten iron manufacturing apparatus and the second molten iron manufacturing apparatus to connect the first molten iron manufacturing apparatus and the second molten iron manufacturing apparatus, and is generated in a molten gasifier of the first molten iron manufacturing apparatus. The composite molten iron including a third molten iron manufacturing apparatus for branching a portion of the reducing gas supplied to the flow reduction reactor and using the branched reducing gas to reduce the spectroscopy to a certain level and supply it to the iron source of the second molten iron manufacturing apparatus. A manufacturing apparatus can be provided.

 The third molten iron manufacturing apparatus is provided on a conduit for supplying a high temperature reducing gas to the crab flow reducing reactor via a dust circulation device of the first molten iron manufacturing apparatus, and mixes oxygen into the high temperature reducing gas. in,

 A conduit provided at a rear end of the oxygen mixing furnace to branch a portion of the reducing gas, and

 Connected to the conduit and receiving a branched reducing gas from the conduit may include a two-flow reduction to convert the spectroscopy to a reducing agent.

 The second flow reduction path may be composed of two stages or three or more stages. A second sensible heat recovery device may be connected to a rear end of the second flow reducing path to recover sensible heat of exhaust gas discharged from the second flow reducing path. It may be connected to the rear end of the second sensible heat recovery device may include a second dry dust collector for separating the fugitive dust in the exhaust gas.

 A second gas connected to a rear end of the second dry dust collector to sense the exhaust gas;

It may include two gas cooler.

 In the second flow reduction path may include a reducing element storage tank for storing the reducing body is discharged through the conduit from the second flow reduction path is connected to the second lowest flow reduction path.

 It is connected to the lower end of the reduction ring storage tank to the inside of the iron bath-type melt reduction reactor through the ring reducing element pneumatic pipe connecting the branch reducing body storage tank and the iron bath-type molten reduction reactor from the ring reducing body storage tank It may include a reducing element conveying device blown.

At the lower end of the first dry dust collector, the dust separated in the first dry dust collector is the iron bath type together with the reductant discharged from the crab 2 flow reduction reactor. The first feeder, and the first feeder and the reducing element feeder to connect to the molten reduction furnace may be provided with one feeder pipe.

 At the bottom of the second dry dust collector, dust separated from the second dry dust collector may be blown into the iron bath-type melt reduction furnace of the second molten iron manufacturing apparatus together with the reducing member discharged from the second flow reduction reactor. A second feeder connecting the second feeder and the crab feeder 2 and the reducing element feeder may be provided. In order to supply fuel for the hot stove, the first flow reduction path of the first molten iron manufacturing apparatus and the flue gas of the crab flow path 2 are combined and branched from the rear end of the line branched to the by-product gas line to the hot stove. The hot stove fuel gas supply conduit may be connected. ·

In addition, according to another embodiment of the present invention, a plurality of high temperature to reduce the spectral to convert to reduced iron, the first flow reducing reactor, a plurality of high temperature to produce the reduced reducing iron discharged from the first flow reducing reactor as a high temperature reducing compact Agglomeration apparatus, a transfer apparatus for transferring the high temperature reduced compacted mass, a compacted material charging apparatus for continuously supplying the high temperature reduced compacted mass transported by the transfer apparatus to a molten gasifier, and a mass of coals in the molten gasifier The compacted coal charging device for continuously supplying to the mass, the compacted coal using high temperature combustion gas generated by burning the bulky coal supplied from the bulky coal charging device and the pulverized coal material blown from the lower part with oxygen; Reduction of spectroscopic reduction in the first flow reduction reactor while melting the high temperature reducing compact from the charging device Melter-gasifier to supply the gas to, C0 to the first to remove the C0 ₂ to branch the exhaust gas portion of the fluidized-bed reactors wherein in addition to the reducing gas supplied in to the melter-gasifier to supply the reduction gas in a first fluidized-bed reactor ₂ Removal apparatus Dust circulator for separating dust contained in the reducing gas generated in the melt gasifier and re-injecting it into the melt gasifier, the gas generated in the melt gasifier according to the pressure fluctuation of the melt gasifier A pressure control device for maintaining a constant pressure in the molten gasifier by branching and cooling the exhaust gas to a by-product gas line, and a first sensible heat recovery device for recovering sensible heat of the exhaust gas discharged from the first flow reduction reactor; 1 First dry dust collection station for separating fugitive dust contained in flue gas discharged from the flow reduction reactor , And to be discharged from the fluidized-bed reactors 1 A first molten iron manufacturing apparatus including a first gas cooling device for sensing exhaust gas;

 An iron bath-type melt reduction furnace which is made of molten iron and slag and reacts with pulverized iron-containing material and pulverized coal blown into the inside, reacted with combustion and melt reduction, and discharged to the outside as an oxidant for secondary combustion in the melt reduction reactor. And a second sensible heat rare water device for recovering the sensible heat of the exhaust gas discharged from the melting and reducing furnace, and a cleaning device for engraving and cleaning the gas discharged from the melting and reducing furnace. Molten iron manufacturing apparatus; And

C0 ₂ provided between the first molten iron manufacturing apparatus and the second molten iron manufacturing apparatus to connect the first molten iron manufacturing apparatus and the crab molten iron manufacturing apparatus and included in the final by-product gas of the first molten iron manufacturing apparatus. The components are partially extracted and removed, and the temperature is elevated to prepare a high-temperature reducing gas. The reduced gas is then reduced and calcined to a predetermined level using the reducing gas, thereby producing a reducing agent, which is then used for the production of the second molten iron manufacturing apparatus. A composite molten iron manufacturing apparatus including a crab molten iron manufacturing apparatus for supplying an iron source may be provided.

The fourth molten iron manufacturing apparatus is connected to a by-product gas conduit through which the by-product gas generated in the first molten iron manufacturing apparatus flows to compress the by-product gas, C0 ₂ component of the gas compressed from the compressor connected to the compressor Remove the 2 C0 ₂ removal device ，

A heat exchanger and a gas heater connected to the second C0 ₂ removal device and configured to raise the C0 ₂ removal gas discharged from the second C0 ₂ removal device to produce a high temperature reducing gas;

 An oxygen mixing furnace connected to the gas heater to blow oxygen into the hot reducing gas;

 It may be connected to the oxygen mixing furnace and supplied with the high temperature reducing gas may include a second flow reduction reactor for reducing and calcining the spectroscopic and subsidiary materials.

 The second flow reduction path may be composed of two stages or three or more stages. It may be connected to the rear end of the heat exchanger and discharged from the second flow reduction path after passing through the heat exchanger may include a two dry dust collector for separating the fugitive dust in the exhaust gas.

A second second coolant connected to a rear end of the crab dry dust collector; It may include a gas cooler.

And a gas conduit connected to a rear end of the second gas relief device to circulate a portion of the exhaust gas to the second C0 ₂ removal device.

 It may include a final exhaust gas conduit connected to the rear end of the second gas relief device for discharging the remaining gas of the exhaust gas to the outside.

The second C0 ₂ removal device and the final exhaust gas conduit may include a gas conduit for discharging the C0 ₂ separated from the second CO ₂ removal device to the outside.

 In the second flow reduction path may include a reduction ring storage tank for storing the branching member discharged through the conduit from the lower flow path.

 It may include a reducing element conveying device for injecting the reducing element from the reducing element storage tank into the inside of the iron bath-type molten reduction reactor through the branch reducing body connecting pipe connecting the reducing element storage tank and the iron bath-type molten reduction path; Can be.

 A first conveying apparatus at a lower end of the first dry dust collector so that the dusts separated by the first dry dust collector are blown into the iron bath-type melt reduction furnace together with the branching body discharged from the second flow reduction reactor; And, it may include a first pneumatic tube connecting the first feeding device and the reducing element pneumatic tube.

 A second conveying apparatus so that dust separated from the second dry dust collector at the bottom of the crab dry dust collector is blown into the iron bath-type melt reduction furnace together with the branched body discharged from the second flow reduction reactor; And, it may include a second feed pipe for connecting the second feeder and the reducing element air pipe.

The gas is heated and the second molten iron from the gas and the second apparatus for manufacturing molten iron includes the C0 ₂ in which the to remove from the 2 C0 ₂ removing device according to the conduit for supplying the fuel required for a hot air producing device It may include a fuel gas supply conduit branched at the front end of the point where the discharged gas is combined to be connected to the hot stove and the gas heating furnace.

【Effects of the Invention】

In the apparatus for manufacturing molten iron, which consists of a plurality of reaction furnaces that directly use powdery or bulky coal and powdery iron-containing ore according to one embodiment of the present invention, a flow reducing reactor using conventional metallurgical ore and coal And coal filled Using low-grade coal in the molten iron-type molten reduction furnace-based molten iron manufacturing apparatus by producing molten iron in the molten gas furnace-based molten iron manufacturing apparatus and stably reducing the low-grade ore by using a portion of the reducing gas generated stably. It is possible to manufacture molten iron stably and with high efficiency.

In addition, according to another embodiment of the present invention, in the composite molten iron manufacturing apparatus composed of a plurality of semi-furnace furnaces directly using powdered or bulky coal and powdered iron ore using conventional metallurgical ore and coal In the molten iron manufacturing apparatus based on the fluid reduction reactor and the coal stratified melt gasification furnace, molten iron is manufactured, the co ₂ component included in the final by-product gas is partially extracted and removed, and the temperature is raised to high temperature reducing gas. By using it to stably reduce low-grade ore and use it as an iron source, it is possible to manufacture molten iron stably and with high efficiency in the molten bath-type molten reduction furnace based molten iron manufacturing apparatus.

 Therefore, by using the apparatus for producing composite molten iron according to one embodiment and / or another embodiment of the present invention, molten iron may be simultaneously produced using not only conventional metallurgical ores and coal, but also ores and coal conventionally known as unsuitable for metallurgy. Can be.

[Brief Description of Drawings]

 1 is a schematic configuration diagram of a composite molten iron manufacturing apparatus according to an embodiment of the present invention.

 2 is a schematic process flow diagram illustrating a material flow in the composite molten iron manufacturing apparatus as an embodiment of the composite molten iron manufacturing apparatus according to an embodiment of the present invention.

 Figure 3 is a table showing the gas properties ratio according to the material flow in the composite molten iron manufacturing apparatus as an embodiment of the composite molten iron manufacturing apparatus according to an embodiment of the present invention.

 4 is a schematic configuration diagram of a composite molten iron manufacturing apparatus according to another embodiment of the present invention.

 5 is a schematic process flow diagram illustrating a material flow in the composite molten iron manufacturing apparatus as an embodiment of the composite molten iron manufacturing apparatus according to another embodiment of the present invention.

FIG. 6 is a table illustrating gas property ratios according to material flow in a composite molten iron manufacturing apparatus as an embodiment of the composite molten iron manufacturing apparatus according to another embodiment of the present invention. [Specific contents to carry out invention]

 Hereinafter, with reference to the accompanying drawings, it will be described an embodiment of the present invention to be easily implemented by those skilled in the art. As can be easily understood by those skilled in the art, the embodiments described below may be modified in various forms without departing from the spirit and scope of the present invention. Where possible, the same or similar parts are represented using the same reference numerals in the drawings.

 The terminology used below is merely to refer to a specific embodiment and is not intended to limit the present invention. As used herein, the singular forms “a,” “an,” and “the” include plural forms as well, unless the phrases clearly indicate the opposite. As used herein, the meaning of "comprising" embodies a particular characteristic, domain, integer, step, equivalent, element and / or component, and other specific characteristics, domain, integer, step, operation, element, component and / or group. It does not exclude the presence or addition of.

 All terms including technical terms and scientific terms used below have the same meaning as those commonly understood by those skilled in the art. Terms defined in advance are additionally interpreted to have a meaning consistent with the related technical literature and the presently disclosed contents, and are not interpreted in an ideal or very formal sense unless defined.

 1 is a schematic configuration diagram of a composite molten iron manufacturing apparatus according to an embodiment of the present invention.

 Referring to Figure 1, the first molten iron manufacturing apparatus of the composite molten iron manufacturing apparatus composed of a plurality of semi-furnace furnaces directly using powdered or bulky coal and powdered iron ore according to an embodiment of the present invention,

A plurality of high temperature compaction apparatuses (B) comprising a multi-stage first flow reduction reactor (A) configured to reduce spectroscopy to convert to reduced-reduced iron, and to produce the reduced-reduced iron discharged from the first flow reduction reactor (A) as a high-temperature reduced compacted body (B). ), A conveying apparatus (D) for conveying the high temperature reduced compacted material crushed to a predetermined size 괴 compacted material for continuously supplying the high temperature reduced compacted material conveyed by the conveying device (D) to the melt gasifier (G) For continuously supplying the charging device (E) and the bulky coal to the molten gasifier (G) The bulky coal charging device F, the bulky coal supplied from the bulky coal charging device F, and the pulverized coal material blown from the lower part are burned by using high-temperature combustion gas generated by oxygen. Melt gasification furnace (G) for melting the high-temperature reduced compacted material supplied from the sieve charging device (E) and for supplying the reducing gas required for spectroscopic reduction in the first flow reduction reactor (A), the first flow reduction reactor C0 ₂ removal device for supplying a reducing gas to the first flow reduction path (A) in addition to the reducing gas supplied from the molten gasifier (G) after branching a part of the exhaust gas of (A) to remove ω ₂ . A dust circulation device (H) for separating dust contained in the reducing gas generated in the melt gasifier (G) and re-injecting it into the melt gasifier (G), according to the pressure fluctuation of the melt gasifier (G) In the melt gasifier (G) A pressure control device (1) for maintaining a constant pressure in the molten gasifier (G) by discharging the generated gas by branching and discharging it to a by-product gas line (1), and exhaust gas discharged from the first flow reduction path (A). A first sensible heat recovery device (J) for recovering the sensible heat of the gas, a first dry dust collector (K) for separating the fugitive dust contained in the exhaust gas discharged from the first flow reduction path (A), and the first One gas filling device (L) may be included for the detection of the exhaust gas discharged from the one-flow flow path (A).

 In addition, the second molten iron manufacturing apparatus of the composite molten iron manufacturing apparatus,

 (A) An iron bath-type molten reduction furnace, which is made of molten iron and slag and reacts with powdered iron-containing material and pulverized coal blown into the inside, and is discharged to the outside through reaction such as combustion and melt reduction.

 A hot air furnace (b) for producing hot air blown into the melt reduction furnace (a) as an oxidant for secondary combustion; and

 It may include a washing device (d) for cooling and cleaning the gas discharged from the melt reduction path (a).

The composite molten iron production apparatus is provided between the first molten iron production apparatus and the second molten iron production apparatus to connect the first molten iron production apparatus and the second molten iron production apparatus, and to melt gasification of the first molten iron production apparatus. Branching a part of the reducing gas generated in (G) and supplied to the crab flow reducing reactor (A) and using the branched reducing gas to reduce the spectroscopy to a certain level to the iron source of the crab iron molten iron manufacturing apparatus It may include a third molten iron manufacturing apparatus for supplying. The system for manufacturing molten iron 3 is a conduit (30) for supplying a high temperature reducing gas to the first flow reduction path (A) of the first molten iron production apparatus via the dust circulation device (H) of the first molten iron production apparatus. An oxygen mixing furnace (2) which is provided in the for blowing oxygen into the high temperature reducing gas;

 A conduit 31 provided at a rear end of the oxygen mixing furnace 2 to branch a portion of the reducing gas; and

 It may be connected to the conduit 31 and supplied with a reducing gas branched partially from the conduit may include a two-flow reduction reactor (1) to reduce the spectroscopic conversion to a branching body.

 The second flow reduction path (1) may be composed of two or three or more stages. In addition, the second sensible heat recovery device (3), the second sensible heat recovery device (3) connected to the rear end of the second flow reduction path (1) for the hydration of the flue gas sensible heat discharged from the second flow reduction path (1) ( A second dry dust collector (4) connected to the rear end of 3) for separating fly dust in the exhaust gas; and

 A second gas filling device 5 connected to the rear end of the second dry dust collector 4 and cooling the exhaust gas may be sequentially provided.

 In addition, in the second flow reduction path (1) consisting of a plurality of stages are connected to the second lowest flow reduction path to store the branched body discharged through the conduit (19) from the second flow reduction path (1) Reduction tank for 20 and

 (A) an iron bath-type molten reduction furnace of the reducing agent storage tank 20 and the second molten iron manufacturing apparatus connected to the lower end of the reducing element storage tank 20 to convert the reducing body from the reducing element storage tank 20; It may be provided with a reducing element conveying device (21) and the like blown into the iron bath-type molten reduction furnace (a) of the second molten iron manufacturing apparatus through a reducing element pneumatic pipe (10) connecting.

 Further, at the lower end of the first dry dust collector (K), dust separated from the first dry dust collector (K) is manufactured with the second reducing iron discharged from the second flow reduction path (1). A U-feed pipe connecting the first feeder 6 and the first feeder 6 and the reducing element feeder 10 so as to be blown into the iron bath-type melt reduction reactor of the apparatus. (7) may be provided.

At the lower end of the second dry dust collector 4, the second dry dust collector 4 [0019] The two-feed apparatus (8) so that the separated dusts can be blown into the iron bath-type melt reduction reactor (a) of the second molten iron manufacturing apparatus together with the component reducing body discharged from the second flow reduction reactor (1). And a second pneumatic tube 9 which connects the second pneumatic apparatus 8 and the reducing element pneumatic tube 10.

 In addition, the exhaust gas of the first flow reduction path (A) and the second flow reduction path (1) of the first molten iron production apparatus for supplying fuel for the hot stove (b) in the second molten iron production apparatus. May include a hot stove fuel gas supply conduit (18) connected to the hot stove (b) by branching from the rear end of the line branching to the by-product gas line. Hereinafter, with reference to Figure 1, the operation of the composite molten iron manufacturing apparatus according to an embodiment of the present invention will be described.

The reducing gas generated in the melt gasification furnace (G) of the first molten iron manufacturing apparatus is combined with the C0 ₂ removal gas supplied from the C0 ₂ removal device (M) and then passed through a dust circulation device (H). Dust in the gas is removed. Some of the reducing gas from which the dust has been removed is branched to the pressure control device (I) and the other is supplied as a high temperature reducing gas through the conduit (30) to the rough U flow reduction path (A) of the first molten iron manufacturing apparatus. do.

 An oxygen mixing furnace (2) is provided on the conduit (30), and oxygen is blown into the oxygen mixing furnace (2) to combust a portion of the high temperature reducing gas flowing in the oxygen mixing furnace (2) as the heat of combustion. Raise the temperature of the high temperature reducing gas.

At this time, the temperature of the high temperature reducing gas at the rear end of the oxygen mixing furnace (2) is the first flow reduction path (A) to which the high temperature reducing gas is supplied and the second flow reduction path of the crab molten iron manufacturing apparatus (1 In order to prevent the spectroscopic adhesion in), it is preferable to set the level ^at approximately 700 to 780 ^° C.

The hot reducing gas heated up to the temperature at the rear end of the oxygen mixing furnace 2 is branched from the conduit 30 to the conduit 31 and then supplied to the second flow reduction reactor 1. The second flow reduction reactor (1) is composed of a multi-stage (for example, consisting of three stages in Figure 1), the second flow reduction reactor (1) of the second stage of the second flow reduction reactor of the multistage is supplied with spectroscopy and raw materials Multi-stage crab 2 flow reduction reactor (1) The hot gas and counter flow method, that is, the spectroscopic and subsidiary materials are supplied from the top to the bottom, and the hot gases are supplied from the bottom to the top and intersect with each other. In the process, the spectroscopic and subsidiary materials are reduced and calcined. Converted to reducible elements.

 The branch reducing body is discharged from the second flow reducing circuit of the crab 2 flow reducing reactor (1) and stored in the branch reducing body storage tank 20, and then to the pneumatic device 21 provided at the bottom of the reducing iron storage tank (20) Blown into the iron bath-type molten reduction reactor (a) in the second molten iron manufacturing apparatus through a branching-reduction element pipe (10), and then melt reduced and slagging after being dissolved in the iron bath-type molten reduction reactor (a). It is converted into molten iron and slag by reaction.

 In addition, the reduction rate of the reduced ore contained in the branch reducing body discharged from the bottom of the two flow reducing reactor (1) is about 60-70% is suitable, which is 6 (reduction rate of ore at 70% or more reduction rate This is because the energy required for the melt reduction and slagging of the reducing agent in the iron bath-type melt reduction reactor (a) in the second molten iron manufacturing apparatus is excessively increased at a reduction rate of 60-70% or less. In order to maintain a reduction rate, it is preferable that the second flow reduction path 1 is composed of, for example, two or three stages of multistage.

In addition, after the exhaust gas discharged from the second flow reduction path (1) is sensed through the second sensible heat recovery device (3), the dust contained in the exhaust gas is separated through the second dry dust collector (4) After cooling to room temperature in the second gas incineration device (5) and discharged from the crab 1 flow reduction path (A) of the first molten iron manufacturing apparatus, the crab 1 sensible heat recovery device (J), the crab 1 dry dust collector The dust is removed and merged with the sensed gas via 00 kPa and the first gas relief device (L). Part of the combined gas is supplied to the C0 ₂ removal device (M), and the remainder is combined with the gas discharged through the pressure control device (I) and discharged to the by-product gas line.

In addition, the first dry dust collector (K) and the second dry dust collector (4) at the lower end is provided with a crab 1 conveying device (6) and the second conveying device (7), respectively, the first conveying device (6) ) And the second conveying apparatus (7) are exhaust gas from the first dry dust collector (K) and the sieve 2 dry dust collector (4), the first flow reduction path (A) and the second flow reduction path (1) Receiving dust separated from the first and second pneumatic tubes (7,9) through the reducing agent By connecting with the feed pipe (10) is mixed with the ring reducing body in the ring reducing element (10) and then blown into the iron bath melt reduction reactor (a). An embodiment of manufacturing molten iron using a composite molten iron manufacturing apparatus including a plurality of reactors directly using powdery or bulky coal and powdery iron-containing ore according to an embodiment of the present invention. In order to meet the object of the present invention, the first apparatus for producing molten iron is to produce molten iron stably and with high efficiency, and the spectroscopy and coal used generally have relatively low iron contents as shown in Tables 1 to 3 below. Large high-grade ores and also highly metallurgical coal were used.

[Table 1] Composition of ore used in crab 1 molten iron manufacturing apparatus

[Table 2] Composition of coal used in the first molten iron production apparatus

Table 3 Composition of subsidiary materials used in first molten iron manufacturing apparatus

 Also, unlike the first molten iron manufacturing apparatus, the second molten iron manufacturing apparatus uses low-grade ore with high gangue content as shown in the following [Tables 4] to [Table 5] and low-cost anthracite coals without any coking property.

[Table 4] Composition of used ore of the second molten iron manufacturing apparatus

castle

In addition, the 3rd molten iron manufacturing apparatus used the subsidiary material of the same composition as the 1st molten iron manufacturing apparatus. 2 and 3 are used to manufacture a molten iron of 180 tons per hour in the molten iron manufacturing apparatus using a third molten iron manufacturing apparatus of the composite molten iron manufacturing apparatus according to an embodiment of the present invention, 100 ton per hour in the second molten iron manufacturing apparatus Table showing the flow chart and the gas physical properties ratio as an example of the process for producing.

 In addition, the following [Table 6] to [Table 9] is a composition table showing the contents of the main components of the molten iron and slag produced in the first and second molten iron manufacturing apparatus according to an embodiment of the present invention, respectively .

[Table 6] Composition of production molten iron of first molten iron manufacturing apparatus

Table 7 Composition of production slag of the first molten iron production apparatus

[Table 8] Composition of molten iron for production of second molten iron manufacturing apparatus

[Table 9] Composition of production slag of the second molten iron manufacturing apparatus

 In the case of the crab molten iron manufacturing apparatus, the use of inexpensive lead and raw materials compared to the first molten iron manufacturing apparatus increases the impurity content of S and P in the molten iron, but it is generally a level that can be removed in a refining process.

 As described above, in the first molten iron manufacturing apparatus, molten iron is stably and efficiently produced by using relatively expensive lead and raw materials, and as a result, high temperature reducing gas generated stably in the first molten iron manufacturing apparatus is used. By using the lower spectroscopy and secondary feedstock from the second flow reduction reactor (1) it is shown that a stable reducing agent of approximately 60 ~ 70% level.

Further, this powder reducing body was added to the iron bath-type melt reduction reactor (a) in the second molten iron manufacturing apparatus. By supplying to an iron source, the crab molten iron manufacturing apparatus as described above shows that molten iron is stably produced even using inexpensive anthracite coal. And, Figure 4 is a schematic diagram of a composite molten iron manufacturing apparatus according to another embodiment of the present invention.

 The apparatus for manufacturing complex molten iron according to another embodiment of the present invention is the same as that described in the apparatus for manufacturing complex molten iron according to the exemplary embodiment of the present invention, except for the matters described below in detail.

 Referring to Figure 4, the crab 1 molten iron manufacturing apparatus of the composite molten iron manufacturing apparatus composed of a plurality of semi-furnace furnaces directly using powdered or bulky coal and powdered iron ore according to another embodiment of the present invention,

A plurality of high temperature compaction apparatuses (B) comprising a multi-stage first flow reduction reactor (A) configured to reduce spectroscopy to convert to reduced-reduced iron, and to produce the reduced-reduced iron discharged from the first flow reduction reactor (A) as a high-temperature reduced compacted body (B). ), A conveying device (D) for conveying the shredded high temperature reduced compacted material into a constant size, and a compacted material charging for continuously supplying the high temperature reduced compacted material transported by the transporting device (D) to the melt gasifier (G) A bulk general coal charging device (F) for continuously supplying the device (E) and the bulk general coal to the melt gasifier (G), and the bulk general coal supplied from the bulk general coal charging device (F); The high-temperature reduced compacted material supplied from the compacted material charging device (E) is melted by using the combustion gas of fine silver generated by burning the pulverized coal ash blown from the lower part with oxygen, and the spectroscopy is performed in the flow reducing reactor (A). To reduce Is a molten gasifier (G) for supplying a reducing gas, and a portion of the exhaust gas of the crab flow reducing reactor (A) is removed to remove C0 ₂ and then added to the reducing gas supplied from the molten gasifier (G). 1 C0 ₂ removal device (M) for supplying the reducing gas to the flow reduction path (A), the dust contained in the reducing gas generated in the melt gasifier (G) is separated and re-injected into the melt gasifier (G). Dust circulating device 00, in accordance with the pressure fluctuations in the melt gasifier (G) branched and cooled the gas generated in the melt gasifier (G) and discharged to the by-product gas line in the melt gasifier (G) Pressure control device (1) for maintaining a constant pressure, discharged from the first flow reduction path (A) Crab sensible heat recovery device (J) for recovering the sensible heat of the exhaust gas, a first dry dust collector (K) for separating the fugitive dust contained in the exhaust gas discharged from the first flow reduction path (A), and the It may include a first gas engraving device (L) for sensing the exhaust gas discharged from the first flow reduction path (A).

 In addition, the second molten iron manufacturing apparatus of the composite molten iron manufacturing apparatus,

 (A) An iron bath-type molten reduction furnace, which is made of molten iron and slag and reacts with powdered iron-containing material and pulverized coal blown into the inside, and is discharged to the outside through reaction such as combustion and melt reduction.

 A hot air furnace (b) for producing hot air blown into the melt reduction furnace (a) as an oxidant for secondary combustion;

 A second sensible heat recovery device (c) for recovering sensible heat of the exhaust gas discharged from the melt reduction path (a), and

 It may include a cleaning device (d) for engraving and cleaning the gas discharged from the melt reduction path (a).

The composite molten iron manufacturing apparatus is provided between the first molten iron manufacturing apparatus and the second molten iron manufacturing apparatus to connect the first molten iron manufacturing apparatus and the second molten iron manufacturing apparatus, and the final by-product gas of the first molten iron manufacturing apparatus. Partially extract and remove the C0 ₂ component contained in the product and heat it to prepare a reduced silver gas, and then use the reducing gas to reduce and calcinate spectroscopy and subsidiary materials to a certain level to prepare a reducing agent. It may include a fourth molten iron manufacturing apparatus for supplying to the iron source of the second molten iron manufacturing apparatus.

 The fourth molten iron manufacturing apparatus is connected to the by-product gas conduit 120 through which the by-product gas generated in the first molten iron manufacturing apparatus flows, the compressor 101 for compressing the by-product gas;

A second C0 ₂ removal device 102 connected to the compressor 101 to remove co ₂ components of the compressed gas from the compressor 101;

Wherein the 2 C0 ₂ removing device 102 is connected to the crab 2 C0 ₂ removal unit 102, heat exchanger 104 and the gas heater is provided for the production of Ko Un reducing gas by raising the temperature of the C0 ₂ removing gas discharged from the (105) ，

Is connected to the gas heater 105 and oxygen is introduced into the hot reducing gas. Blowing oxygen mixing furnace (106), and

 It may include a second flow reduction reactor 107 is connected to the oxygen mixing furnace 106 and supplied with the high temperature reducing gas to reduce and calcine the spectroscopic and subsidiary materials.

 The two flow reduction path 107 may be composed of two or three or more stages.

 A second dry dust collector 115 connected to a rear end of the heat exchanger 104 and discharged from the second flow reduction path 107 to pass through the heat exchanger 104 to separate fly dust in the exhaust gas; ， And

 It may be connected to the rear end of the second dry dust collector (115), the two gas filling device (116) and the like to sequentially cool the exhaust gas.

A gas conduit 121 connected to a rear end of the second gas cooler 116 to circulate a portion of the exhaust gas to the second CO ₂ remover 102;

 A final exhaust gas conduit 124 connected to a rear end of the crab 2 gas filling device 116 to discharge the remaining gas from the exhaust gas to the outside; and

A gas conduit 126 may be provided to connect the second C0 ₂ removal device 102 and the final exhaust gas conduit 124 to discharge C0 ₂ separated from the second C0 ₂ removal device 102 to the outside. have.

 In addition, in the second flow reduction path 107, a reduction ring storage tank 109 for storing the ring reduction body discharged through the conduit 108 from the lowest flow reduction path, and the reduction ring storage tank 109 An iron bath-type melt reduction reactor of the second molten iron manufacturing apparatus through a ring-reducing body conveying pipe (111) connecting the ring-reducing body storage tank (109) and the iron bath-type molten reduction path (a) from ) May be provided with a reducing element conveying apparatus (110) to be blown into.

 In addition, at the lower end of the first dry dust collector (K), dust separated from the first dry dust collector (K) is manufactured with the second reducing iron together with the branched body discharged from the second flow reduction path (7). A first conveying pipe connecting the first conveying apparatus 113 and the first conveying apparatus 113 and the reducing element conveying tube 111 so as to be blown into the iron bath-type melt reduction reactor (a) of the apparatus. 114 may be provided.

At the bottom of the crab two dry dust collector 115, dust separated from the crab two dry dust collector 115 is discharged from the second flow reduction path 107. The second conveying apparatus 117 and the second conveying apparatus 117 and the reducing element conveying pipe so as to be blown into the iron bath-type melt reduction reactor (a) of the second molten iron manufacturing apparatus together with the reducing member. Two pneumatic tubes 118 may be provided to connect the 111.

In addition, in the conduit 120 to remove the fuel required for the gas heating furnace 105 and the hot stove (b) of the second molten iron manufacturing apparatus is removed from the crab 2 CO ₂ removal device 102 ^' A fuel gas supply conduit 119 branched at a front end of a point where the gas containing C0 ₂ and the gas discharged from the second molten iron are combined to be connected to the hot stove (b) and the gas heating furnace 105. It may be provided. Hereinafter, with reference to Figure 4, it will be described the operation of the composite molten iron manufacturing apparatus according to another embodiment of the present invention.

The by-product gas generated in the first molten iron manufacturing apparatus flows through the conduit 120 and merges with a part of the exhaust gas of the second flow reduction path 107 flowing through the conduit 121 to the compressor 101. After supplied and boosted, it is supplied to the second C0 ₂ removal device 102 connected to the compressor 101 to remove C0 ₂ in the gas.

Wherein the 2 C0 ₂ removing C0 ₂ concentration in the C0 ₂ removal gas discharged from the device 102 together about 3% to 15% degree is preferred, which is to become not more than C0 ₂ concentration of 3¾) wherein the 2 C0 ₂ removing device This is because the cost required for the installation and operation of the 102 becomes too high, and if the C0 ₂ concentration is 15% or more, the reducing power of the C0 ₂ removal gas is excessively lowered, resulting in the ore in the second flow reduction path 107. This is because the reduction is not smooth.

In addition, the C0 ₂ in the removing device 102 is removed from the product gas and the second flow reduced to 107, the exhaust gas of the first apparatus for manufacturing molten iron C0 ₂ is discharged via a separate gas conduit 126 to the outside.

The C0 ₂ removal gas discharged from the second C0 ₂ removal device 102 is provided inside the heat exchanger 104 and the hot gas discharged from the second flow reduction path 107 while passing through the heat exchanger 104. The hot combustion gas and the gas heater 105 generated by burning the exhaust gas supplied through the gas conduit 119 from the gas heater 105 after being heated by contacting through a heat exchange tube (Tube). Inside It is heated by contact through a heat exchange tube (Tube) provided.

Gas heating temperature in the gas heater 105 is preferably about 400 ~ 450 ^° C, which is a large amount of CO gas contained in the CO ₂ removal gas, the metal by the CO gas above the temperature This is because dust dusting causes damage to the heat exchange tube (Tube) provided inside the gas heater (105).

The gas heated to approximately 400 to 450 ^° C. in the gas heater 105 is partially combusted by oxygen blown out of the oxygen mixing furnace 106 in the oxygen mixing furnace 106, and is heated as the heat of combustion. At this time, the temperature of the gas discharged from the oxygen mixing furnace 106 is preferably about 700 ~ 780 ^° C in order to prevent the spectral adhesion in the two-flow reduction reactor (107) that the gas is supplied. . The hot gas heated up to the temperature at the rear end of the oxygen mixing furnace 106 is supplied to the second flow reduction reactor 107.

 The two-flow flow reactor 107 is composed of multiple stages (for example, consisting of three stages in Figure 1), the second flow reduction reactor of the second stage of the second flow reduction reactor 107 of the multi-stage spectroscopic and secondary raw materials are supplied 2 Flow Reduction Furnace (107) At the Lower End The hot gas and counter flow method supplied to the second flow reduction reactor, that is, the spectral and subsidiary materials are supplied from the top to the bottom, and the hot gases are supplied from the bottom to the top. In contact with each other, in the process, the spectroscopy and the subsidiary materials are reduced and calcined to be converted into a reducing agent.

 The ring reducing body is discharged from the second flow reducing path at the bottom of the second flow reducing path (107), transferred and stored in the ring reducing body storage tank (109) through the conduit (108), and the ring reducing body storage tank (109) After being blown into the iron bath-type molten reduction furnace (a) in the crab iron molten iron production apparatus through the powder reducing element pneumatic pipe 111 by the pneumatic device 110 provided at the lower end (a) After dissolving in, it is converted into molten iron and slag by melt reduction and slagging reaction.

In addition, the reduction rate of the reduced ore contained in the branch reducing body discharged from the bottom of the second flow reduction reactor (107) is suitable about 60 to 70%, which is more than the reduction rate of the ore occurs, At a reduction rate of less than that, the melt reduction of the reducing agent in the iron bath-type melt reduction reactor (a) in the molten iron manufacturing apparatus and This is because the energy required for slagging is excessively increased. In order to maintain such a reduction rate, the second flow reduction path 107 is preferably composed of, for example, two or three stages of multistage.

On the other hand, the exhaust gas discharged from the crab 2 flow reduction path 107 is cooled by heat exchange with the C0 ₂ removal gas while passing through the heat exchanger 104 as described above, the crab 2 dry dust collector (115) After the dust contained in the exhaust gas is separated, and after being sensed to room temperature in the crab 2 gas indenter 116, a part is branched and the first molten iron manufacturing apparatus through the conduit 121 as described above. Of the gas flowing through the conduit 124 through the conduit 119 is combined with the by-product gas of the re-supplied to the second CO ₂ removal device 102, the remainder is discharged to the outside via the conduit 124 It is supplied as the fuel of the gas heater 105 and the hot stove (b) of the 2nd molten iron manufacturing apparatus. In addition, a first conveying apparatus 113 and a second conveying apparatus 117 are provided at a lower end of the crab 1 dry dust collecting device K and the crab 2 dry dust collecting device 115, respectively. ) And the second feeding device (117) from the first dry dust collector (K) and the crab 2 dry dust collector (115) in the first flow reduction path (A) and the crab 2 flow reduction path (7) The separated dust is received and connected to the ring reducing element in the ring reducing element transport pipe (11) by connecting with the ring reducing element transport pipe (111) through the first and second air transport pipes (114, 118), respectively. It is blown into the iron bath type melting reduction furnace (a). An embodiment of manufacturing molten iron using a composite molten iron manufacturing apparatus including a plurality of reactors directly using powdered or bulky coal and powdered iron ore according to another embodiment of the present invention is described. In order to meet the object of the present invention, the first molten iron manufacturing apparatus is stable and highly efficient in order to produce molten iron, the spectroscopy and coal used generally have a relatively low iron content as shown in Tables 11 to 13 below. Large high-grade ores and also highly metallurgical coal were used.

 [Table 11] Composition of ore used in crab molten iron manufacturing apparatus

[표 12] 제 1 용철 제조 장치의 사용 석탄의 조성

[Table 12] Composition of coal used in the first molten iron production apparatus

[Table 13] Composition of used raw materials of crab molten iron manufacturing apparatus

 In addition, unlike the first molten iron production apparatus, the second molten iron manufacturing apparatus used low-grade ore with high gangue content as shown in the following [Table 14] to [Table 15] and low-cost anthracite coal without any coking property.

[Table 14] Composition of ore used in the second molten iron manufacturing apparatus

[Table 15] Composition of coal used in the second molten iron manufacturing apparatus

 In addition, the 4th molten iron manufacturing apparatus used the subsidiary material of the same composition as the 1st molten iron manufacturing apparatus.

 5 is a method for producing molten iron of 100 ton per hour in the second molten iron manufacturing apparatus using a fourth molten iron manufacturing apparatus according to another embodiment of the present invention using the exhaust gas of the first molten iron manufacturing apparatus for producing a molten iron of 180 tons per hour As an example of the process is a table showing the process flow and gas properties ratio according to the material flow. In addition, [Table 16] to [Table 19] is a composition table showing the main component content of the molten iron and slag produced in the first and second molten iron manufacturing apparatus according to another embodiment of the present invention.

[Table 16] Composition of molten iron for production of crab molten iron manufacturing apparatus

[Table 17] Composition of production slag of the first molten iron production apparatus Si02 AI203 CaO FeO S

 30.731 1 7,695 36, 893 10.516 0.488 1 .226-

[Table 18] Composition of production molten iron of the second molten iron manufacturing apparatus

 In the case of the second molten iron manufacturing apparatus, the use of inexpensive lead and raw materials, compared to the first molten iron manufacturing apparatus, increases the impurity content of S and P in the molten iron, but is generally at a level that can be removed in a refining process. As described above, in the first molten iron manufacturing apparatus, molten iron is stably and efficiently produced by using relatively expensive lead and raw materials, and as a result, the high temperature reducing gas stably generated in the U molten iron manufacturing apparatus is used. By using the lower spectroscopy and the feedstock from the second flow reduction reactor (107) it is shown that the approximate level of stable reducing agent is produced.

 Further, by supplying this branched body to the iron source of the iron bath-type molten reduction furnace (a) in the second molten iron production apparatus, as described above in the second molten iron production apparatus, molten iron can be stably produced. It is showing.

[Explanation of code]

 A Near U Flow Reduction B B High Temperature Compaction Unit

 D Feeding device E Compact material charging device

 F Mass Coal Charging Device G Melting Furnace

 H Dust Circulator I Pressure Control

 J No. 1 Sensible Heat Recovery System K No. 1 Dry Dust Collector

 L Crab 1 Gas Incinerator a Iron Bath Melting Reduction Furnace

 b Hot stove c Second sensible heat recovery device

d cleaning device : Crab 2 flow reduction reactor 2: oxygen mixing furnace

： Crab 2 sensible heat recovery device 4: 2nd dry dust collecting device: 2nd gas filling device 6, 8: 1st, 2nd conveying device, 9: 1st, 2nd conveying pipe 10: Reducing element supplying pipe, 30, 31 ： Conduit 20 ： Reducing element reservoir ： Reducing element pneumatic tube

01 Compressor 102: 2nd C0 ₂ Remover 04 Heat Exchanger 105: Gas Heater

06 Oxygen mixing furnace 107: Second flow reduction reactor 08 Conduit 109: Reducing element storage tank 10 Reducing element conveying device 111: Reducing body conveying pipe 13, 117: First and second feeding devices 114, 118: First, 2nd pneumatic tube 15, 116: 1st, 2nd angle relief device 119: fuel gas supply conduit 0: by-product gas conduit 121, 126: gas conduit 4: final exhaust gas conduit

Claims

[Patent Claims]  [Claim 1] A first flow reduction reactor consisting of a multi-stage reducing the spectroscopic conversion to a reduced reduction iron, A plurality of high temperature compaction apparatus for producing a reduced reduction iron discharged from the first flow reduction furnace as a high temperature reduction compact, The high temperature crushed to a certain size Transfer device for transporting reduced agglomerates, compacting device charging device for continuously supplying the high temperature reduced compacted material transported by the transport device to a molten gasifier, and agglomerate for continuously supplying a bulky coal to the molten gasifier General coal charging device of the high temperature, high temperature supplied from the compact body charging device by using the high temperature combustion gas generated by burning the fine coal and the fine coal powder blown from the lower Melting the reducing agglomerates and supplying a reducing gas for spectroscopic reduction in the first flow reduction reactor. By gasification, said going to remove the co ₂ branches the exhaust gas portion of a U fluidized C0 ₂ removal to the shop supplies a reducing gas in a first fluidized-bed reactor, in addition to the reducing gas supplied in to the melting gasifier, the A dust circulator for separating dust contained in reducing gas generated in a melt gasifier and re-injecting it into the melt gasifier, and partially branching the gas generated in the melt gasifier according to pressure fluctuations in the melter. A pressure control device for maintaining a constant pressure in the molten gasifier by discharging to the by-product gas line, a first sensible heat recovery device for recovering the sensible heat of the exhaust gas discharged from the first flow reduction path, the first flow reduction path Crab dry dust collector for separating the fugitive dust contained in the exhaust gas discharged from the, and the first Sir nyaeng the exhaust gas discharged from the reduction to copper is 1 to an apparatus for manufacturing molten iron including a first gas nyaenggak device;  An iron bath-type molten reduction furnace, which is made of molten iron and slag and reacts with pulverized iron-containing material and pulverized coal, which are blown into the inside, and is discharged to the outside through reaction such as combustion and melt reduction, and as an oxidant for secondary combustion in the molten reduction furnace A second apparatus for producing molten iron, comprising: a hot blast furnace for producing hot air blown in; and a cleaning device for sweeping and washing the gas discharged from the melt reduction reactor; And It is provided between the said 1st molten iron manufacturing apparatus and the said 2nd molten iron manufacturing apparatus, and connects the said 1st molten iron manufacturing apparatus and the said 2nd molten iron manufacturing apparatus, and the said 1st molten iron A part of the reducing gas generated in the melting gasifier of the manufacturing apparatus and supplied to the crab flow reducing reactor is branched and the spectroscopy is reduced to a constant level using the branched reducing gas to the iron source of the second molten iron manufacturing apparatus. Third molten iron manufacturing apparatus to supply  Composite molten iron manufacturing apparatus comprising a.  [Claim 2]  In U,  The third molten iron manufacturing apparatus is provided on a conduit for supplying a high temperature reducing gas to the first flow reduction path via a dust circulation device of the first molten iron manufacturing apparatus, the oxygen mixing to blow oxygen into the high temperature reducing gas in, A two-flow reducing reactor provided at a rear end of the oxygen mixing furnace for branching the portion of the reducing gas, and connected to the conduit and receiving a portion of the reducing gas branched from the conduit to reduce the spectroscopy and convert it into a branching body. Composite molten iron manufacturing apparatus which includes  [Claim 3]  The method of claim 2,  The two-flow reduction furnace is a composite molten iron manufacturing apparatus consisting of a multi-stage of two or three stages.  [Claim 4]  The method of claim 3,  And a second sensible heat recovery device for recovering the sensible heat of the exhaust gas discharged from the second flow reduction path connected to a rear end of the second flow reduction path.  [Claim 5]  The method of claim 4,  And a second dry dust collector connected to a rear end of the second sensible heat recovery device to separate the scattering dust in the exhaust gas. [Claim 6]  The method of claim 5, A second gas connected to a rear end of the second dry dust collector to sense the exhaust gas; Composite molten iron manufacturing system comprising a gas engraver.  [Claim 7]  According to claim 6,  An apparatus for manufacturing molten iron, comprising: a reducing element storage tank connected to a lowermost second flowing reduction path in the second flowing reduction path for storing the reducing element discharged through the conduit from the second flowing reduction path.  [Claim 8]  The method of claim 7,  It is connected to the lower end of the reduction ring storage tank to the inside of the iron bath-type melt reduction reactor through the ring reducing element pneumatic pipe connecting the branch reducing body storage tank and the iron bath-type molten reduction reactor from the ring reducing body storage tank Composite molten iron manufacturing apparatus including a reducing element conveying apparatus to be blown.  [Claim 9]  The method of claim 8,  At the bottom of the crab 1 dry dust collector, the dust separated from the crab 1 dry dust collector is blown into the iron bath-type melt reduction furnace together with the reducing agent discharged from the crab 2 flow reduction reactor. , And a crab 1 pneumatic tube connecting the crab 1 pneumatic apparatus and the branch reducing element pneumatic tube. [Claim 10]  According to claim 9,  At the bottom of the second dry dust collector, dust separated from the second dry dust collector may be blown into the iron bath-type melt reduction furnace of the crab molten iron manufacturing apparatus together with the branched body discharged from the second flow reduction reactor. A composite molten iron manufacturing apparatus is provided with a crab 2 feeder and a second feed pipe connecting said crab feeder 2 and said branching element feed pipe.  [Claim 11]  The method of claim 10, In order to supply fuel for the hot stove, the first flow reducing path of the first molten iron manufacturing apparatus and the second flue gas of the second flow reducing furnace are combined and branched from the rear end of the line branched to the by-product gas line to the hot stove. Hot stove connected Composite molten iron manufacturing apparatus including a fuel gas supply conduit.  [Claim 12]  First flow reduction furnace consisting of a multi-stage reducing the spectroscopic conversion to reduced reducing iron ᅳ A plurality of high temperature compaction apparatus for producing the reduced reduced iron discharged from the first flow reduction furnace as a high temperature reducing compact, transfer the high temperature reducing compact Conveying apparatus, a compacted material charging device for continuously supplying the high temperature reduced compacted material conveyed by the transporting device to the molten gasifier, and a massive general carbon charging device for continuously supplying the bulky coal to the molten gasifier The molten silver reduced compacted material supplied from the compacted material charging device is melted by using the high-temperature combustion gas generated by burning the bulky coal supplied from the bulky coal charging device and the pulverized coal ash blown from the lower part with oxygen. And a melt gasification furnace for supplying a reducing gas for spectroscopic reduction in the first flow reduction reactor. C02 removal apparatus for supplying a reducing gas to the first flow reduction reactor in addition to the reducing gas supplied from the molten gasifier after branching off a part of the exhaust gas of the copper reduction furnace, reducing gas generated from the molten gasifier A dust circulator for separating dust contained therein and re-injecting it into the melting gasifier, and partially diverting the gas generated in the melting gasifier according to the pressure fluctuation of the molten gasifier to discharge the byproduct gas line. A pressure control device for maintaining a constant pressure in the melt gasifier, a first sensible heat recovery device for recovering the sensible heat of the exhaust gas discharged from the first flow reduction reactor, the exhaust gas discharged from the crab flow path A first dry dust collector for separating fly dust, and discharged from the first flow reduction path 1, an apparatus for manufacturing molten iron-based gas to the nyaeng Sir comprises a first gas nyaenggak device; Inside the powdered iron-containing material and the fine coal is blown into the interior to melt, burn and iron yokhyeong smelting reduction for manufacturing and discharged to the outside as molten iron and slag through the banung, such as smelting reduction, the ^'for secondary combustion in a smelting reduction A hot blast furnace for producing hot air blown as an oxidant, a second sensible heat recovery device for recovering sensible heat of the exhaust gas discharged from the melt reduction reactor, and a cleaning device for engraving and cleaning the gas discharged from the melt reduction reactor; A second molten iron manufacturing apparatus; And ― The crab is provided between the first molten iron production apparatus and the second molten iron production apparatus The first molten iron manufacturing apparatus and the second molten iron manufacturing apparatus are connected to each other, the C02 component included in the final by-product gas of the first molten iron manufacturing apparatus is partially extracted and removed, and then heated to a high temperature reducing gas. Fourth molten iron manufacturing apparatus for producing spectroscopic reduction bodies by reducing and calcining spectroscopy and secondary raw materials to a predetermined level using reducing gas, and supplying them to the iron source of the crab molten iron manufacturing apparatus.  Composite molten iron manufacturing apparatus comprising a.  [Claim 13]  The method of claim 12, The fourth apparatus for producing molten iron is a compressor connected to a by-product gas conduit through which the by-product gas generated in the apparatus for manufacturing molten iron is flown to compress the by-product gas, and a gas increase C0 ₂ component connected to the compressor and compressed from the compressor. 2 C0 ₂ removal device for removing the ， Wherein said C0 2 removing device ₂ is connected with the first group 2 C0 ₂ removal is provided to produce a high-temperature reducing gas by raising the temperature of the C0 ₂ removing gas discharged from the heat exchanger and a gas burner,  An oxygen mixing furnace connected to the gas heater to blow oxygen into the hot reducing gas;  The apparatus for manufacturing molten iron connected to the oxygen mixing furnace and supplied with the high temperature reducing gas to reduce and calcinate spectroscopic and subsidiary materials. [Claim 14]  The method of claim 13,  The two-flow reduction furnace is a composite molten iron manufacturing apparatus consisting of a multi-stage of two or three stages.  [Claim 15]  The method of claim 14, Complex apparatus for manufacturing molten iron including a second dry dust collector for connection to a rear end of the heat exchanger and the second flow to exit the reduced to ^"remove the scattered dust in the exhaust gas after passing through the heat exchanger. [Claim 16] Clause 15  And a second gas cooling device connected to a rear end of the crab two dry dust collector to sense the exhaust gas.  [Claim 17]  The method of claim 16, And a gas conduit connected to a rear end of the second gas cooler to circulate a portion of the exhaust gas to the second C0 ₂ removal device.  [Claim 18]  The method of claim 17,  And a final exhaust gas conduit connected to a rear end of the second gas relief device for discharging the remaining gas from the exhaust gas to the outside. [Claim 19]  The method of claim 18, 2 wherein the C0 ₂ removal device and a composite apparatus for manufacturing molten iron including a gas conduit for connection to the end-off-gas conduit to the discharge the separated C0 ₂ eseo 2 C0 ₂ removing device to the outside.  [Claim 20]  에 19, wherein  Complex molten iron manufacturing apparatus comprising a reducing element storage tank for storing the reducing member discharged through the conduit from the lowest flow reduction in the second flow reduction reactor ᅳ  [Claim 21]  The method of claim 20,  And a reducing agent conveying device for blowing the reducing agent from the reducing agent storage tank into the iron bath-type melt reduction reactor through a reducing-reduction body connecting pipe connecting the reducing-element storage tank and the iron bath-type molten reduction path. Composite molten iron manufacturing equipment ᅳ  [Claim 22]  The method of claim 21, At the bottom of the first dry dust collector, the dust separated in the first dry dust collector is discharged from the second flow reduction path together with the reducing member, the iron bath type. A composite molten iron manufacturing apparatus comprising a crab 1 pneumatic device, and a crab 1 ply pipe connecting the first pneumatic device and the branch reducing body pneumatic pipe to be blown into the melt reduction furnace. [Claim 23]  The method of claim 22,  Crab 2 conveying apparatus so that the dust separated from the second dry dust collector at the bottom of the second dry dust collector can be blown into the iron bath-type melt reduction furnace with the reducing agent discharged from the second flow reduction reactor , And a second molten iron pipe connecting the second conveying device and the branch reducing element transporting pipe. [Claim 24]  The method of claim 23, In the conduit to supply the fuel required for a hot-air to the gas-heating and the shop second apparatus for manufacturing molten iron from the gas and the second apparatus for manufacturing molten iron it includes the C0 ₂ is removed from the second C0 ₂ removing device And a fuel gas supply conduit connected to the hot stove and the gas heating furnace by branching at a front end of the discharged gas.