KR102083540B1 - Apparatus for manufacturing molten iron and method for manufacturing thereof - Google Patents

Abstract

The present invention is a reactor having a space that can dissolve the raw material containing iron ore; And a hydrogen separator connected to the reactor to separate hydrogen from the flue gas generated in the reactor and to supply the reactor to the reactor.

Description

Apparatus for manufacturing molten iron and method for manufacturing

The present invention relates to a molten iron manufacturing apparatus and a molten iron manufacturing method, and more particularly, to a molten iron manufacturing apparatus and a molten iron manufacturing method that can reduce the amount of carbon dioxide generated during the operation.

Reduction of carbon dioxide (CO ₂ ) is emerging as a national emergency in various industrial sectors. Accordingly, in the steelmaking industry, which is one of the energy-saving industries, it is necessary to develop a technology that can reduce carbon dioxide in the steel making process, which accounts for more than 80% of the total carbon dioxide generation.

At this time, three methods can be used to greatly reduce the amount of carbon dioxide generated by using the coal resources and coal resources used in the process of manufacturing molten iron. That is, techniques such as recovering the thermal energy generated during the process to improve the reaction or process efficiency, reduce the absolute oxygen amount of the reduction target, or reduce the amount of coal resources used as the reducing agent and the heat source.

For example, in the blast furnace process, which is a representative method of molten iron production, the energy efficiency is so high that it is almost 95% of the theoretical value. In particular, Korea and Japan have high levels of introduction of advanced technology for steelmaking, and the potential for further energy reduction is at the lowest level in the world. Therefore, it is difficult to further improve the reaction or process efficiency.

In addition, in order to reduce the absolute amount of oxygen to be reduced, there is a method of using reduced iron or scrap having a high metal iron content as an iron source. Since reduced iron or scrap has a very high reduction rate, when it is used as a raw material in a steelmaking process, the amount of oxygen to be removed is low, so that the amount of coal resources used as a reducing agent can be reduced. In particular, the use of scrap is advantageous in that waste resources can be recycled. However, there may be a problem that an additional energy source may be required due to a decrease in gas utilization rate in a blast furnace or a melting furnace, and the use efficiency of an energy source that can be effectively used, such as carbon monoxide in exhaust gas, may be reduced.

On the other hand, in order to reduce the carbon dioxide generated in the iron making process, the development of technology using a resource containing hydrogen in place of coal resources is being actively made. However, the use of hydrogen-containing resources or costs to produce them is expensive, and the use of alternative energy sources due to the use of hydrogen-containing by-products such as coke oven gas is expensive compared to coal resources, and thus the use of the fuel is limited due to economic problems. In this case, when scrap is used as an iron source while using hydrogen-containing resources instead of coal resources, there is a problem in that the use efficiency of hydrogen-containing resources is lowered due to the high reduction rate of scrap, thereby lowering energy efficiency.

KR 2004-0056269 A

The present invention provides a molten iron manufacturing apparatus and a molten iron manufacturing method that can reduce the amount of carbon dioxide generated during the operation.

The present invention provides a molten iron manufacturing apparatus and a molten iron manufacturing method that can reduce the amount of coal resources used.

The present invention provides a molten iron manufacturing apparatus and a molten iron manufacturing method that can improve the energy use efficiency.

The present invention is a reactor having a space that can dissolve the raw material containing iron ore; And a hydrogen separator connected to the reactor to separate hydrogen from the exhaust gas generated in the reactor and supply the hydrogen to the reactor.

In the reactor, a blowing nozzle capable of supplying an oxygen-containing gas, pulverized coal, and a hydrogen-containing substance is provided.

And a preheating furnace having a space for preheating scrap, wherein the hydrogen separator is connected to the preheating furnace to supply the exhaust gas from which the hydrogen is separated to the preheating furnace.

The hydrogen separator may include a body member having a path through which the exhaust gas moves; And a pressure regulating member installed to adjust the pressure inside the body member.

The hydrogen separator is connected to at least one of the top and bottom of the reactor to supply the hydrogen.

The apparatus further includes a water remover installed between the hydrogen separator and the preheating furnace to remove water from the exhaust gas from which the hydrogen is separated.

The apparatus may further include a combustor connected to the preheater to supply an oxygen-containing gas to the preheater.

The apparatus may further include a molding machine installed between the preheating furnace and the reactor so as to mold the scrap supplied to the reactor.

The reactor includes at least one of the blast furnace and flow reduction reactor.

The present invention is a process for producing molten iron by melting iron ore in the reactor; Separating hydrogen from flue gas generated while producing the molten iron; And supplying the hydrogen to the reactor.

The manufacturing of the molten iron may include supplying an oxygen-containing gas, pulverized coal, and a hydrogen-containing material to the reactor.

The hydrogen-containing substance includes at least one of coke oven gas, Finex flue gas, natural gas, and heavy oil.

After separating the hydrogen from the exhaust gas generated while producing the molten iron, further comprising the step of supplying the exhaust gas separated from the hydrogen to the preheating furnace for preheating the scrap.

The method may further include removing water from the exhaust gas from which the hydrogen is separated before supplying the exhaust gas from the hydrogen to the preheating furnace.

The process of removing water from the exhaust gas from which the hydrogen is separated may include a process of liquefying water by cooling the exhaust gas from which the hydrogen is separated.

The process of supplying the exhaust gas from which the hydrogen is separated to the preheating furnace is a process of preheating the scrap with reaction heat generated by burning carbon monoxide contained in the exhaust gas from which the hydrogen is separated and oxygen-containing gas supplied to the preheating furnace. It includes.

After preheating the scrap, the method further includes the step of introducing the scrap into the reactor.

According to embodiments of the present invention, when manufacturing molten iron, scrap of less oxygen than iron ore may be used as a raw material of molten iron. Thus, the specific gravity of carbon dioxide in the exhaust gas can be reduced.

In addition, hydrogen may be separated from flue gas generated during molten iron production and used as a reducing agent. Thus, the amount of coal resources used as the reducing agent can be reduced, and the amount of carbon dioxide generated by the coal resources can be reduced.

In addition, the scrap may be preheated using carbon monoxide in the exhaust gas from which hydrogen is separated. Therefore, it is possible to reduce the energy cost required for the molten iron manufacturing. Therefore, energy use efficiency can be improved.

1 is a view showing the structure of a molten iron manufacturing apparatus according to an embodiment of the present invention.
Figure 2 is a flow chart showing a molten iron manufacturing method according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention in more detail. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the embodiments are intended to complete the disclosure of the present invention and to those skilled in the art to fully understand the scope of the invention. It is provided to inform you. BRIEF DESCRIPTION OF THE DRAWINGS The drawings may be exaggerated in order to describe the invention in detail, in which like reference numerals refer to like elements.

1 is a view showing the structure of a molten iron manufacturing apparatus according to an embodiment of the present invention. Hereinafter, a molten iron manufacturing apparatus according to an embodiment of the present invention will be described.

Referring to FIG. 1, the molten iron manufacturing apparatus 100 includes a reactor 110 and a hydrogen separator 120. In addition, the molten iron manufacturing apparatus 100 may further include a preheating furnace 140, a water remover 130, a combustor 150, a molding machine 170, and a carbon dioxide remover 160.

The reactor 110 may be formed in a container shape having an internal space. Thus, the raw material containing iron ore into the internal space from the upper portion of the reactor 110 may be charged and dissolved. In addition, a blowing nozzle may be installed at the lower portion of the reactor 110. The blowing nozzle may supply an oxygen containing gas, a fuel, and a hydrogen containing material into the reactor 110. The blowing nozzle may be provided to supply fuel, oxygen-containing gas, and hydrogen-containing material, or may be provided to supply fuel, oxygen-containing gas, and hydrogen-containing material together.

At this time, the charging raw material of the reactor 110 may include iron-containing raw materials such as iron ore, reduced iron, sintered ore and reducing agents such as coke, coal. If necessary, the feedstock may further contain auxiliary materials such as limestone.

In addition, the oxygen-containing gas blown into the reactor 110 through the blowing nozzle may be air having a higher oxygen content than pure oxygen or air in the atmosphere. For example, the oxygen concentration of the oxygen containing gas may exceed 21%. Thus, the nitrogen content of the exhaust gas generated in the reactor 110 can be lowered. Therefore, it is possible to increase the content of carbon monoxide (CO) gas and hydrogen (H ₂ ) that can be reused in the exhaust gas. Accordingly, the labor, carbon monoxide, and carbon dioxide may be easily separated from the exhaust gas generated in the reactor 110.

Pulverized coal can be used as fuel. The hydrogen-containing material may include hydrogen-containing by-product gas such as coke oven gas or Finex flue gas, hydrogen-containing gas such as natural gas, hydrogen-containing liquid such as heavy oil, and the like. Finex flue-gas is the flue-gas produced at the FINEX plant.

In this case, the reactor 110 may be various types of reactors capable of manufacturing molten iron. For example, a blast furnace or a fluid reduction reactor may be used as the reactor 110. When the reactor 110 is a reducing furnace, a reducing furnace for manufacturing reduced iron, which is a raw material of iron, introduced into the reactor 110 may be further provided.

The preheating furnace 140 has a space for accommodating scrap which is a raw material of iron. The preheating furnace 140 may preheat the scrap using the exhaust gas generated in the reactor 110. The preheating furnace 140 may be connected to the hydrogen separator 120 through a pipe or a duct. Thus, the exhaust gas of the reactor 110 in which hydrogen is separated from the hydrogen separator 120 may be supplied to the preheating furnace 140. The preheated scrap in the preheater 140 may be supplied to the reactor 110 along with other iron-containing raw materials.

The combustor 150 may supply an oxygen-containing gas such as pure oxygen to the preheater 140. The oxygen-containing gas may react with the exhaust gas from which hydrogen is separated in the hydrogen separator 120 and the preheating furnace 140 to generate heat of reaction. For example, the combustor 150 may be installed in the main body of the preheating furnace 140 to burn carbon monoxide in the exhaust gas from which hydrogen is separated, or after preheating carbon monoxide in the exhaust gas from which hydrogen is separated from the combustor 150. The heated gas may be supplied into the furnace 140. In this case, although the combustor 150 is described as being connected to the preheating furnace 140, a pipe or a duct connecting the combustor 150 and the preheating furnace 140 may be provided.

The molding machine 170 is installed between the preheating furnace 140 and the reaction furnace 110. Thus, the molding machine 170 may mold the scrap supplied from the preheating furnace 140 to the reactor 110. For example, the molding machine 170 may be processed by cutting or compacting the scrap into a suitable form. At this time, since the scrap is preheated in the preheating furnace 140 and hot, the scrap can be easily molded by the molding machine 170.

The carbon dioxide remover 160 is connected to the preheating furnace 140. For example, the inlet of the carbon dioxide remover 160 may be connected to the exhaust gas discharge part on the preheating furnace 140. Thus, the exhaust gas discharged from the preheating furnace 140 may be supplied to the carbon dioxide remover 160. The carbon dioxide remover 160 may remove or separate carbon dioxide from the exhaust gas discharged from the preheating furnace 140. That is, since carbon monoxide is generated by the reaction of carbon monoxide and the oxygen-containing gas of the exhaust gas generated in the reactor 110 inside the preheating furnace 140, it may be removed from the carbon dioxide remover 160. The carbon dioxide remover 160 may remove carbon dioxide using a pressure swing adsorption (PSA) method, a thermal swing adsorption (TSA) method, a chemical adsorption method, or the like, which selectively absorbs and separates carbon dioxide in exhaust gas using a solid absorbent. Can be.

In addition, the outlet of the carbon dioxide remover 160 may be connected to at least one of the reactor 110 and the preheater 140. Accordingly, the carbon dioxide remover 160 may supply the exhaust gas from which carbon dioxide has been removed to at least one of the reactor 110 and the preheater 140. In this case, the carbon dioxide remover 160 is described as being connected to the preheating furnace 140 or the reactor 110, but a pipe or duct connecting the carbon dioxide remover 160 to the preheating furnace 140 or the reactor 110 is provided. May be

Meanwhile, the exhaust gas passing through the carbon dioxide remover 160 includes carbon monoxide, hydrogen, methane (CH ₄ ), and the like, which is supplied to at least one of the reactor 110 and the preheater 140 or reduced in another process. Can be used as a raw material for agents or chemicals. For example, the carbon dioxide remover 160, the off-gas is molten reduced are supplied to the melter-gasifier and the fluidized-bed reactors of the steel making process may be used as the reducing agent, methanol and dimethyl ether with the separated carbon dioxide (CO ₂₎ through the (Dimethylether, It can also be used as a raw material to make DME).

Hydrogen separator 120 is connected to the reactor (110). For example, the inlet of the hydrogen separator 120 may be connected to the exhaust gas discharge portion of the upper portion of the reactor 110 through a pipe or duct. Therefore, exhaust gas generated in the reactor 110 may be supplied to the hydrogen separator 120. The hydrogen separator 120 may separate hydrogen from the flue gas generated in the reactor 110. In this case, a valve is installed in the pipe or the duct connecting the reactor 110 and the hydrogen separator 120 to selectively supply the exhaust gas to the hydrogen separator 120.

For example, the hydrogen separator 120 may separate hydrogen only by using a pressure swing adsorption (PSA) method in which a solid absorbent is selectively absorbed and separated from hydrogen in exhaust gas. Accordingly, the hydrogen separator may include a body member, an adsorption member, and a pressure regulating member.

The body member has a path through which the exhaust gas moves. The adsorption member is installed inside the body member to adsorb hydrogen in the exhaust gas passing through the body member. The pressure regulating member is installed to adjust the pressure inside the body member. Accordingly, when the pressure regulating member raises the pressure inside the body member to a predetermined adsorption pressure, hydrogen may be adsorbed to the adsorption member in the exhaust gas. When the pressure regulating member lowers the pressure inside the body member to a predetermined recovery pressure, hydrogen adsorbed on the adsorption member may be separated from the adsorption member and recovered. However, the structure of the hydrogen separator 120 and the method of separating hydrogen from the exhaust gas may be various.

At this time, a controller may be provided to control the operation of the valve. When the inside of the body member is at the adsorption pressure, the valve may be opened to introduce the exhaust gas generated in the reactor 110 into the body member. When the body member is at the recovery pressure, the valve may be closed to block the exhaust gas generated in the reactor 110 from being introduced into the body member. Therefore, it is possible to prevent the exhaust gas is introduced into the body member and mixed in the process of recovering hydrogen.

The hydrogen discharge unit for discharging hydrogen from the hydrogen separator 120 may be connected to at least one of the upper and lower portions of the reactor 110 through a pipe or a duct. Hydrogen separated from the hydrogen separator 120 may be supplied to the upper and lower portions of the reactor 110. Therefore, hydrogen may serve as a reducing agent, and the amount of reducing agent such as coke or coal supplied into the reactor 110 may be reduced. Alternatively, the hydrogen separator 120 may improve the reduction efficiency of the hydrogen containing material.

Hydrogen may be supplied into the reactor 110 in the form of a gas, and a controller may adjust the amount of hydrogen supplied to the upper or lower portion of the reactor 110. Therefore, hydrogen may be selectively supplied to the upper or lower portion of the reactor 110.

In addition, a portion of the hydrogen separator 120 to discharge the exhaust gas from which hydrogen is separated may be connected to the preheating furnace 140 through a pipe or a duct. Thus, exhaust gas from which hydrogen is separated from the hydrogen separator 120 may be supplied to the preheating furnace 140. Since the exhaust gas from which hydrogen is separated contains carbon monoxide (CO) components, it may cause combustion reaction with the oxygen-containing gas in the preheating furnace 140. At this time, the scrap may be preheated using the generated heat of reaction.

In this case, a heater (not shown) may be installed between the reactor 110 and the hydrogen separator 120. The heater may heat the hydrogen supplied from the hydrogen separator 120 to the reactor 110. Thus, hydrogen may be supplied to the reactor 110 at a high temperature.

The moisture remover 130 is installed between the hydrogen separator 120 and the preheater 140. Thus, exhaust gas from which hydrogen is separated from the hydrogen separator 120 may be supplied to the preheating furnace 140 through the water remover 130. The water remover 130 may remove water from the exhaust gas from which hydrogen is separated.

For example, the moisture remover 130 may be a cooler. Therefore, the moisture remover 130 cools the exhaust gas from which hydrogen is separated, thereby liquefying and collecting moisture. Thus, the preheating furnace 140 may be supplied with the exhaust gas from which the moisture is removed.

As such, since the raw material of the molten iron can be used as a raw material of the molten iron in the manufacture of molten iron, the amount of carbon dioxide in the exhaust gas can be reduced. In addition, since the scrap can be preheated by the exhaust gas generated during the molten iron production, the energy cost required for the molten iron can be reduced, and the energy use efficiency can be improved. In addition, since hydrogen may be separated from the exhaust gas generated during molten iron production and used as a reducing agent, the amount of coal resources used as the reducing agent may be reduced, and the amount of carbon dioxide generated by the coal resources may be reduced.

2 is a flowchart illustrating a method for manufacturing molten iron according to an embodiment of the present invention. Hereinafter, a molten iron manufacturing method according to an embodiment of the present invention will be described.

Referring to Figure 2, the molten iron manufacturing method, the process of producing molten iron by melting iron ore in the reactor (S110), the process of separating hydrogen from the exhaust gas generated while producing molten iron (S120), and hydrogen separated from the exhaust gas Supplying to the reactor (S130).

Referring to FIG. 1, first, a charging raw material for preparing molten iron is introduced into the reactor 110. In this case, the charging raw material may include iron-containing raw materials such as iron ore, reduced iron, sintered ore, and reducing agents such as coke, coal, and the like, and may also include auxiliary raw materials such as limestone as necessary. In addition, when the raw material is initially added to the reactor 110, scrap that is not preheated may be additionally added.

When the raw material is introduced into the reactor 110, an oxygen-containing gas, pulverized coal, and a hydrogen-containing substance may be blown into the reactor 110 through a blowing nozzle below the reactor 110. In this case, the oxygen-containing gas may be blown while heated to a temperature of several hundred degrees, and the raw material introduced into the reactor 100 may be dissolved by the heat generated while the pulverized coal is burned by the oxygen-containing gas and the hydrogen-containing material. . Further, the hydrogen-containing material may include hydrogen-containing by-product gas such as coke oven gas or Finex flue gas, hydrogen-containing gas such as natural gas, hydrogen-containing liquid such as heavy oil, and the like. Hydrogen contained in the hydrogen containing material may serve as a reducing agent. Therefore, by reducing the input amount of the reducing agent such as coke or coal, it is possible to reduce the amount of carbon dioxide generated in the reactor (110).

As the raw material is dissolved in the reactor 110, molten iron is manufactured. In this case, in order to reduce the ratio of nitrogen in the exhaust gas and increase the ratio of carbon monoxide (CO) and hydrogen (H ₂ ), pure oxygen may be blown into the reactor 110. Injecting pure oxygen into the reactor 110 may reduce the nitrogen content of the exhaust gas to facilitate the separation of carbon dioxide, which is subsequently performed, and increase the ratio of effective energy, such as carbon monoxide and hydrogen, in the exhaust gas.

In this regard, the reaction furnace is usually blown with hot air heated by air with an oxygen-containing gas, but the hot air is very high nitrogen content, carbon dioxide and nitrogen occupy most of the exhaust gas. Therefore, when injecting pure oxygen into the reactor 110, it is possible to reduce the nitrogen content of the exhaust gas.

Then, exhaust gas generated while the molten iron is manufactured may be supplied to the hydrogen separator 120. In the hydrogen separator 120, hydrogen may be separated from the exhaust gas generated in the reactor 110.

Looking at this, the exhaust gas generated as the molten iron is prepared as the charging raw material is reduced and dissolved, the content of carbon monoxide (CO) and hydrogen (H ₂ ) is higher than the exhaust gas of the existing blast furnace. This occurs because the utilization rate of the carbon monoxide gas in the reactor 110 is reduced by using a scrap having a higher reduction rate than the conventional iron ore as a charging raw material. In addition, since the hydrogen-containing material is blown into the reactor 110, the hydrogen introduced into the reactor 110 may also decrease the utilization rate. Therefore, the contents of carbon monoxide and hydrogen in the exhaust gas generated in the reactor 110 may increase.

In fact, based on the existing blast furnace (STD), the hydrogen containing gas COG (normal COG component is 56% H ₂ -27% CH ₄ -8% CO-3% CO ₂ -N ₂ level) Evaluated through theoretical heat and mass balance according to the change of reaction characteristics in the reactor (110). The results are shown in Table 1 below.

unit Blast Furnace (STD) COG (Direct) Gas blowing Nm ³ / tp
(kg / tp) - 134.5 (63.9) Hydrogen in gas - 147.4 Corksby (CR)
kg / tp
495.7 419.1 Pulverized coal ratio (PCR) 313.2 280 Reductant Ratio (CR + PCR) 182.5 139.1 Hydrogen content in flue gas Nm ³ / tp 49.1 97.7

When COG is blown into the existing blast furnace 134.5 Nm 3 / t-p, the amount of hydrogen is 147.4 Nm 3 / t-p, of which 97.7 Nm 3 / t-p is discharged into the flue gas. This is a result of assuming that the present conditions of the conventional blast furnace operating conditions, when a large amount of scrap is used, the ratio of hydrogen discharged to the injected hydrogen can be further increased.

For efficient use of carbon monoxide and hydrogen in the exhaust gas, the exhaust gas discharged from the reactor 110 may be introduced into the hydrogen separator 120 to selectively separate only hydrogen gas. For example, the hydrogen separator 120 may separate hydrogen from the reactor flue gas by using a pressure swing adsorption (PSA) method that selectively absorbs and separates hydrogen in the flue gas using a solid absorbent.

In this case, an oxygen-containing gas having a higher oxygen or oxygen content than air is blown into the reactor 110 to reduce the nitrogen content of the exhaust gas. Therefore, selective separation of the gas can be facilitated, and the ratio of carbon monoxide gas and hydrogen in the exhaust gas can be increased.

Hydrogen separated from the reactor flue-gas is supplied to the reactor (110). Since the selectively separated hydrogen has better reducing properties than carbon monoxide gas, the hydrogen is recycled and blown into the reactor 110 to be used for reducing the charged raw materials. In this case, the separated hydrogen may be blown into the upper part of the reactor (or a region where the charging raw material is mainly reduced by gas) or the lower part of the reactor 110 according to the operating conditions.

Hydrogen separated off-gas can be used to preheat scrap, which is the raw material for molten iron. Therefore, the exhaust gas from which hydrogen is separated may be supplied from the hydrogen separator 120 to the preheating furnace 140. Since the temperature of the degassed hydrogen is limited, a separate heat source may be required to preheat the scrap efficiently (or at high temperatures). At this time, since the pure oxygen is supplied to the reactor 110, the ratio of carbon monoxide that can be used as a fuel required to preheat the scrap and reduce the ratio of nitrogen in the components of the exhaust gas generated in the reactor 110, hydrogen The waste gas can be easily preheated using the exhaust gas.

Meanwhile, before supplying the exhaust gas of the reactor 110 in which hydrogen is separated to the preheating furnace 140, water (H ₂ O) may be removed from the exhaust gas from which hydrogen is separated. Since moisture may interfere with combustion in the preheater 140, hydrogen may be additionally separated or removed from the separated exhaust gas.

For example, the exhaust gas from which hydrogen is separated may be supplied to a cooler used as the moisture remover 130. The cooler can cool off the hydrogen separated off gas to less than 100 degrees Celsius. Accordingly, water in the exhaust gas from which hydrogen is separated is liquefied and separated, and carbon monoxide or the like may pass through the cooler in a gaseous state. Therefore, exhaust gas from which hydrogen and moisture have been removed may be supplied to the preheating furnace 140. At this time, without separately removing the water from the exhaust gas separated from the hydrogen, it is also possible to directly supply the exhaust gas separated from the hydrogen to the preheating (140).

In the preheating furnace 140, scrap may be charged as a raw material of iron. Scrap may be charged into the preheating furnace 140 before the molten iron is produced in the reactor 110 or before the molten iron is manufactured in the reactor 110. When the exhaust gas is supplied to the preheater 140, the combustor 150 blows oxygen-containing gas into the preheater 140. The oxygen-containing gas supplied to the preheater 140 may generate a heat source through a chemical reaction, such as the following formula, with carbon monoxide in the exhaust gas from which hydrogen is separated. In this case, the oxygen-containing gas may be pure oxygen.

Expression:

That is, the scrap charged in the preheating furnace 140 may be preheated primarily by the heat of the exhaust gas from which hydrogen is separated, and is generated through the combustion reaction of carbon monoxide in the exhaust gas and the oxygen-containing gas blown into the preheating furnace 140. It can be preheated secondary by the heat of reaction.

The scrap may be preheated in the preheater 140 and then introduced into the reactor 110 to be manufactured as molten iron. Alternatively, the scrap may be preheated in the preheating furnace 140 and then molded or processed into a predetermined shape in the molding machine 170 to be introduced into the reactor 110. After preheating the scrap and charging it into the reactor 110, the amount of heat is higher than when the scrap is charged in the cold state, thereby reducing the temperature in the furnace or the temperature of the molten iron, and reducing the energy consumption required for manufacturing the molten iron. Can be.

After that, the molten iron is produced into steel products through a steelmaking process. Steel products are supplied to users and become waste resources. Waste resources can be collected and used as scrap and used as raw materials to manufacture molten iron. Therefore, waste of resources can be prevented.

On the other hand, the exhaust gas generated in the preheating furnace 140 may pass through the carbon dioxide remover 160 to remove or separate carbon dioxide contained in the exhaust gas. The exhaust gas generated in the reactor 110 and supplied to the preheater 140 includes carbon dioxide, and the carbon dioxide is further generated during the preheating of the scrap in the preheater 140, and thus, in the preheater 140. The generated flue-gas may contain large amounts of carbon dioxide. Therefore, the exhaust gas generated in the preheating furnace 140 may pass through the carbon dioxide remover 160 to remove or separate carbon dioxide in the exhaust gas.

By preheating the carbon dioxide is separated from the carbon dioxide remover 160, the exhaust gas may contain carbon monoxide and methane. Therefore, the exhaust gas may be supplied to the reactor 110 by preheating the carbon dioxide separated and used as a reducing gas for reducing the raw material. Alternatively, the preheating furnace 140 may be supplied as a fuel gas for preheating the scrap. Alternatively, it may be used as a reducing gas by supplying a melt gasification furnace in a molten reduction steelmaking process, a flow reducing furnace, or as a raw material to prepare methanol, dimethylether (DME) together with separated carbon dioxide (CO ₂ ).

As such, the exhaust gas generated in the reactor 110 may be selectively separated and reused. That is, hydrogen in the reactor flue gas may be supplied back into the reactor 110 to be used as a reducing gas, and carbon monoxide may be supplied into the preheating furnace 140 for preheating the scrap and used as a heat source. Therefore, the energy efficiency of the process of manufacturing molten iron can be improved. In addition, since hydrogen, which is a reducing gas, may be supplied into the reactor 110 to reduce the amount of reducing agent such as coal or coke introduced into the reactor 110, carbon dioxide generated in the reactor 110 may be reduced. Can reduce the amount of. Alternatively, the reduction efficiency of the hydrogen-containing substance can be improved.

As described above, in the detailed description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the claims described below, but also by those equivalent to the claims.

100: molten iron manufacturing apparatus 110: reactor
120: hydrogen separator 130: moisture remover
140: preheating 150: burner
160: carbon dioxide remover 170: molding machine

Claims (17)

A reactor having a space capable of dissolving the raw material including iron ore; And
And a hydrogen separator connected to the reactor to separate hydrogen from the exhaust gas generated in the reactor and supply the hydrogen to the reactor.
The hydrogen separator is a body member having a path through which the exhaust gas moves, an adsorption member installed inside the body member to adsorb or separate hydrogen according to the pressure inside the body member, and installed to adjust the pressure inside the body member. A pressure regulating member, a valve for opening and closing between the reactor and the hydrogen separator, and a controller for controlling the operation of the valve according to the pressure inside the body member,
The controller opens the valve to introduce the exhaust gas into the body member when the pressure inside the body member rises to a predetermined suction pressure, and the valve when the pressure inside the body member falls to a preset recovery pressure. Closing the molten iron manufacturing apparatus for blocking the inlet of the exhaust gas into the body member. The method according to claim 1,
The molten iron manufacturing apparatus provided with the said blowing nozzle which can supply an oxygen containing gas, pulverized coal, and a hydrogen containing substance to the said reactor. The method according to claim 1,
Further comprising a preheating furnace having a space for preheating the scrap,
The hydrogen separator is connected to the preheating furnace to supply the exhaust gas from which the hydrogen is separated to the preheating furnace. delete The method according to claim 3,
The hydrogen separator is connected to at least one of the top and bottom of the reactor to supply the hydrogen. The method according to claim 3,
And a water remover installed between the hydrogen separator and the preheating furnace to remove water from the exhaust gas from which the hydrogen is separated. The method according to claim 3,
And a combustor connected to the preheating furnace to supply an oxygen-containing gas to the preheating furnace. The method according to claim 3,
And a forming machine installed between the preheating furnace and the reactor so as to mold the scrap supplied to the reactor. The method according to any one of claims 1 to 3 and 5 to 8,
The reactor is a molten iron manufacturing apparatus including at least one of the blast furnace, flow reduction furnace, and the electric furnace. Preparing molten iron by dissolving iron ore in a reactor;
Separating hydrogen from flue gas generated while producing the molten iron;
Recovering the hydrogen; And
And supplying the hydrogen to the reactor.
Separation of hydrogen from the exhaust gas, the process of increasing the pressure in the body member connected to the reactor to a predetermined adsorption pressure, the process of introducing the exhaust gas into the body member, and installed inside the body member Adsorbing hydrogen of the exhaust gas to an adsorption member,
The process of recovering the hydrogen may include lowering the pressure inside the body member to a predetermined recovery pressure, blocking the inflow of the exhaust gas into the body member, and recovering the hydrogen by separating the hydrogen from the adsorption member. The molten iron manufacturing method comprising a. The method according to claim 10,
The process of manufacturing the molten iron,
A molten iron manufacturing method comprising the step of supplying an oxygen-containing gas, pulverized coal, and a hydrogen-containing material to the reactor. The method according to claim 11,
The hydrogen-containing material, molten iron manufacturing method comprising at least one of coke oven gas, natural gas, and heavy oil. The method according to claim 11,
After separating the hydrogen from the flue gas generated while producing the molten iron,
The molten iron manufacturing method further comprising the step of supplying the exhaust gas from which the hydrogen is separated to a preheating furnace for preheating scrap. The method according to claim 13,
Before supplying the exhaust gas from which the hydrogen is separated to the preheating furnace,
The molten iron manufacturing method further comprising the step of removing water from the exhaust gas separated hydrogen. The method according to claim 14,
The process of removing water from the exhaust gas separated hydrogen,
And a process of liquefying water by cooling the exhaust gas from which the hydrogen is separated. The method according to claim 14,
The process of supplying the exhaust gas in which the hydrogen is separated to the preheating furnace,
And a heat of reaction generated by burning carbon monoxide contained in the exhaust gas from which hydrogen is separated and oxygen-containing gas supplied to the preheating furnace, and preheating the scrap. The method according to claim 16,
After preheating the scrap,
Melting process further comprising the step of injecting the scrap into the reactor.

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