KR102503631B1 - Gas processing device and hydrogen gas manufacturing method - Google Patents

Abstract

The present invention relates to a gas processing device and a method for producing hydrogen gas, comprising: a reducing gas generating unit for producing reducing gas from exhaust gas generated in an iron making process; To produce hydrogen gas, a hydrogen gas generating unit connected to the reducing gas generating unit; and a control unit for controlling supply and flow rate of the reducing gas supplied from the reducing gas generating unit to the hydrogen gas generating unit, and hydrogen gas may be produced using exhaust gas generated during operation.

Description

Gas processing device and hydrogen gas manufacturing method

The present invention relates to a gas processing device and a method for producing hydrogen gas, and more particularly, to a gas processing device capable of producing hydrogen gas using exhaust gas generated during operation and a method for producing hydrogen gas.

The smelting reduction iron manufacturing method is a method of producing molten iron by reducing fine iron ore and using it as an iron source. The molten pig iron manufacturing apparatus for performing the smelting reduction iron manufacturing method includes a multi-stage fluidized reduction furnace for reducing powdered iron ore, a forming device for manufacturing coal briquettes by forming powdered iron discharged from the fluidized reduction furnace, and a forming device for melting the coal briquettes and forming coal briquettes. It may include a melting furnace for supplying a reducing gas generated in the process of melting to the fluidized reducing furnace.

On the other hand, the process of reducing iron ore in the fluidized reduction reactor generates a large amount of flue gas. Such exhaust gas (FOG: Finex off gas) contains a large amount of carbon monoxide (CO), nitrogen (N ₂ ) and hydrogen gas (H ₂ ), which are rich in heat. Accordingly, reducing gas used to reduce iron ore and hydrogen gas are produced by treating exhaust gas.

However, in the prior art, in order to obtain reducing gas and hydrogen gas from exhaust gas, a device for removing carbon dioxide and a device for removing carbon monoxide and nitrogen are separately built and operated, so there is a problem in that the initial investment cost is high. In addition, since the device for removing carbon dioxide and the device for removing carbon monoxide and nitrogen occupy a relatively large space, space utilization is low.

KR 10-2017-0075057 A KR 10-2012-0071086 A

The present invention provides a gas processing device and a method for producing hydrogen gas capable of producing hydrogen gas using exhaust gas generated during operation.

The present invention provides a gas processing device and a hydrogen gas production method capable of reducing equipment construction costs and facilitating maintenance.

A gas processing device according to an embodiment of the present invention includes a reducing gas generator for producing a reducing gas from exhaust gas generated in an iron making process; To produce hydrogen gas, a hydrogen gas generating unit connected to the reducing gas generating unit; and a control unit for controlling whether to supply and flow rate of the reducing gas supplied from the reducing gas generating unit to the hydrogen gas generating unit.

The hydrogen gas generator may include a plurality of gas processors, the hydrogen gas generator may include at least one gas processor among the plurality of gas processors, and the reducing gas generator may include other gas processors.

The plurality of gas processors may be arranged in parallel and have the same structure.

The gas processor of the hydrogen gas generating unit is a hydrogen gas generator including an adsorbent capable of adsorbing carbon monoxide and nitrogen from reducing gas, and the gas treating unit of the reducing gas generating unit is a reducing gas including an adsorbent capable of adsorbing carbon dioxide from exhaust gas. can be a generator.

Each of the plurality of gas processors may include at least two adsorption towers communicating with each other, and each of the at least two adsorption towers may have the same structure.

The reducing gas generator includes a recovery pipe connected to the plurality of reducing gas generators to recover reducing gas, and the hydrogen gas generator is connected to the recovery pipe and the hydrogen gas generator to supply reducing gas to the hydrogen gas generator. It includes a reducing gas supply pipe and a valve formed in the reducing gas supply pipe, and the control unit can control the operation of the valve.

The reducing gas generator includes a plurality of recovery pipes respectively connected to the plurality of reducing gas generators to recover reducing gas and a plurality of first valves formed in the plurality of recovery pipes, and the hydrogen gas generator includes the plurality of recovery pipes. A plurality of reducing gas supply pipes connecting the recovery pipe and the hydrogen gas generator and a plurality of second valves formed in the plurality of reducing gas supply pipes, wherein the control unit includes the plurality of first valves and the plurality of first valves. The operation of 2 valves can be controlled.

The control unit may control the operation of the plurality of first valves and the plurality of second valves to supply reducing gas to the hydrogen gas generator from a normally operating reducing gas generator among the plurality of reducing gas generators.

The reducing gas generator includes a recovery pipe connected to some of the plurality of reducing gas generators, and the hydrogen gas generator is connected to the remaining reducing gas generators not connected to the recovery pipe and the hydrogen gas generator. It includes a reducing gas supply pipe and a valve installed in the reducing gas supply pipe, and the control unit can control the operation of the valve.

A bypass pipe connected to the reducing gas supply pipe and the recovery pipe may be further included, and one side of the bypass pipe may be connected between the valve and the reducing gas generator.

The hydrogen gas generator and the reducing gas generator may be installed at a ratio of 1:3 to 4.

A method for producing hydrogen gas according to an embodiment of the present invention includes preparing exhaust gas generated in a steelmaking process; removing carbon dioxide from the exhaust gas to produce a reducing gas containing carbon monoxide, nitrogen, and hydrogen gas; determining a flow rate of reducing gas to be subsequently treated; Separating reducing gas as much as the determined flow rate; and removing carbon monoxide and nitrogen from the separated reducing gas to produce hydrogen gas.

The process of producing the reducing gas may include supplying the exhaust gas to at least two gas processors among a plurality of gas processors; and adsorbing carbon dioxide contained in the exhaust gas, wherein the process of producing the hydrogen gas includes: supplying reducing gas to at least one gas processor among the plurality of gas processors; and adsorbing carbon monoxide and nitrogen contained in the reducing gas.

The process of producing the reducing gas includes a process of collecting the reducing gas each produced in the at least two gas processors, and the process of separating the reducing gas includes separating a part of the reducing gas from the total reducing gas collected. process may be included.

Separating the reducing gas may include separating at least some of the reducing gas from each of the at least two gas processors.

Separating the reducing gas may include separating at least a portion of the reducing gas from at least one gas processor among the at least two gas processors.

When the flow rate of the separated reducing gas is greater than the determined flow rate, a process of combining some of the separated reducing gas with the reducing gas produced by the remaining gas processors among the at least two gas processors may be included.

Separating the reducing gas may include separating at least a portion of the reducing gas from a normally operating gas processor among the at least two gas processors.

In the process of determining the flow rate of the reducing gas, 5 to 15% of 100% of the total flow rate of the reducing gas produced in the process of producing the reducing gas may be determined as the flow rate of the reducing gas for producing hydrogen gas.

The process of preparing the flue gas may include: charging iron ore into a fluidized reduction furnace and supplying reducing gas to produce reduced iron; and discharging exhaust gas generated in the process of producing the reduced iron from the fluidized reduction furnace.

According to the embodiments of the present invention, it is possible to produce exhaust gas generated in an iron manufacturing process into reducing gas and hydrogen gas using a single gas processing device. That is, reducing gas may be produced by removing carbon dioxide from the exhaust gas, and hydrogen gas may be produced by removing carbon monoxide and nitrogen from some of the reducing gas. At this time, the removal of carbon dioxide and the removal of carbon monoxide and nitrogen may be continuously performed in a single gas processing device. Therefore, since reducing gas and hydrogen gas can be produced without separately preparing a device for producing a reducing gas and a device for producing hydrogen gas, the cost required for facility construction can be reduced, and the scale of the facility can be reduced. It can be reduced to make efficient use of space.

1 is a view schematically showing a molten iron manufacturing facility according to an embodiment of the present invention.
2 is a schematic view of a gas processing device according to an embodiment of the present invention;
3 is a view schematically showing a gas processing device according to a first modified example of the present invention;
4 is a diagram schematically showing a gas processing device according to a second modified example of the present invention;
5 is a view showing a detailed structure of a gas processor according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, only these embodiments will complete the disclosure of the present invention, and will fully cover the scope of the invention to those skilled in the art. It is provided to inform you. In order to clearly express various elements in the drawings, the sizes are exaggerated or enlarged, and the same symbols refer to the same elements in the drawings.

A gas processing device and a method for producing hydrogen gas according to the present invention can be applied to produce hydrogen gas by treating various types of flue gases generated in a steelmaking process. Exhaust gases generated in the steelmaking process include exhaust gases from the smelting reduction process (FOG: FINEX Off Gas, FTG: FINEX Off Gas), blast furnace gas (BOG: Blast furnace Off Gas), converter gas (LDG: Linze Dinawiz Gas), Coke Oven Gas (COG) and the like may be included. Hereinafter, an example of producing hydrogen gas by treating exhaust gas generated in the smelting reduction method will be described.

1 is a view schematically showing the configuration of a molten iron manufacturing facility according to an embodiment of the present invention, and FIG. 2 is a view schematically showing a gas processing device according to an embodiment of the present invention. 1, the solid line represents the movement path of iron ore and reduced iron, and the dotted line represents the movement path of gas.

Referring to FIG. 1, a molten iron manufacturing facility according to an embodiment of the present invention includes a fluidized reduction furnace 110 for producing reduced iron by reducing iron ore, and reducing iron produced in the fluidized reduction furnace 110 at a high temperature. It may include a molding device 120 for molding into, a melting furnace 130 for producing molten iron by melting the compacted ore produced in the molding device 120. In addition, the molten pig iron manufacturing facility may include a gas treatment device 200 for treating flue gas generated in the fluidized reduction reactor 110 . The gas processing device 200 may process exhaust gas generated from the fluidized reduction reactor 110 to produce reducing gas for reducing iron ore, and may generate hydrogen gas using a part of the reducing gas.

The fluidized reduction reactor 110 may produce reduced iron by reducing fine iron ore using a reducing gas. A plurality of fluidized reduction reactors 110 are installed, and fine iron ore can be sequentially moved to the plurality of fluidized reduction reactors 110 to produce reduced iron. For example, the fluidized reduction reactor may include three fluidized reduction reactors (hereinafter, the first fluidized reduction reactor 111, the second fluidized reduction reactor 112, and the third fluidized reduction reactor 113). At this time, the fine iron ore is It is charged into the first flow-through reduction reactor 111, and can be produced as reduced iron through the second flow-through reduction reactor 112 and the third flow-through reduction reactor 113. And the first to third flow-through reduction reactors 111 to 113 ) can be supplied with a reducing gas from the melting furnace 130 and the gas processing device 200 to manufacture fine iron ore into reduced iron.

Reduced iron produced in the fluidized reduction furnace 110 may be charged into the melting furnace 130 after being agglomerated in a fine powder state in a hot state in the molding device 120. The forming device 120 includes a storage device 121 for storing reduced iron discharged from the fluidized reduction furnace 110, and reduced iron supplied from the first storage device 121 to manufacture compacted reduced iron such as briquettes, for example, coal briquettes. It may include a molding machine 123 to do.

The melting furnace 130 may melt coal briquettes to produce molten iron, and supply reducing gas generated in the process of manufacturing molten iron to the fluidized reducing furnace 110 . Accordingly, a supply pipe 132 communicating with the fluidized reduction furnace 110 may be connected to the melting furnace 130 to supply reducing gas to the fluidized reduction furnace 110 .

Exhaust gas discharged from the fluidized reduction reactor 110 may be supplied to the fluidized reduction reactor 110 via the gas treatment device 200 . Accordingly, the fluidized reduction furnace 110 and the gas processing device 220 may be connected through the circulation pipe 150 . The circulation pipe 150 includes a first circulation pipe 151 connecting the fluidized reduction reactor 110 and the gas processing device 200 and a second circulation pipe 151 connecting the gas processing device 200 and the fluidized reduction furnace 110. It may include a pipe (153). At this time, the first circulation pipe 151 may be connected to the first flow reduction furnace 111, and the second circulation pipe 153 may be connected to the third flow reduction furnace 113. A dust collector 140 may be formed in the circulation pipe 150, for example, the first circulation pipe 151 to remove dust and the like contained in the exhaust gas. Also, the gas processing device 200 may produce reducing gas and hydrogen gas from exhaust gas passing through the dust collector 140 .

Referring to FIG. 2 , a gas treatment device 200 according to an embodiment of the present invention includes a reducing gas generator 210 for producing a reducing gas from exhaust gas generated in a steelmaking process, and a reduction gas generating unit 210 for producing hydrogen gas. It may include a hydrogen gas generator 220 connected to the gas generator 210 and a control unit 230 for controlling whether or not to supply and flow rate of the reducing gas supplied from the reducing gas generator to the hydrogen gas generator 220. can

The gas processing device 200 according to an embodiment of the present invention may include a plurality of gas processing devices 201 (201A, 201B, 201C, 201D, 201E). For example, the gas processing device 200 may include a first gas processor 201A, a second gas processor 201B, a third gas processor 201C, a fourth gas processor 201D, and a fifth gas processor 201E. can Here, the gas processing device 200 is described as including five gas processors 201, but the gas processing device 200 may include less than or more than five gas processors.

A plurality of gas processors 201 have the same structure and may be continuously arranged in parallel. Each of the plurality of gas processors 201 may include at least two adsorption towers 2011 capable of communicating with each other, and the at least two adsorption towers 2011 may have the same structure. For example, at least two adsorption towers 2011 may have the same height and diameter, and may be arranged with the same spacing.

Meanwhile, the gas processor 201 may separate the mixed gas using a pressure swing absorption (PSA) method using a difference in adsorption selectivity of an adsorbate with respect to an adsorbent. That is, in the gas processor 201, objects to be removed from gas may vary depending on the type of adsorbent to be filled. That is, the function of the gas processor 201 may vary depending on the object to be removed from the exhaust gas. For example, in order to remove carbon dioxide contained in exhaust gas, an adsorbent such as activated carbon capable of adsorbing carbon dioxide may be filled in the adsorption tower 2011. In addition, in order to remove carbon monoxide and nitrogen contained in exhaust gas, the adsorption tower 210 may be filled with a zeolite-based adsorbent capable of adsorbing carbon monoxide and nitrogen. Through this, the function of the gas processor 201 may be determined. The gas processor 201 produces reducing gas or hydrogen gas while sequentially or alternately performing the processes of adsorption, decompression, washing, and pressure equalization in a plurality of adsorption towers 2011, and the specific structure and gas of the gas processor 201 The processing method will be described later.

In an embodiment of the present invention, in order to remove carbon dioxide from exhaust gas to produce reducing gas and to produce hydrogen gas using the produced reducing gas, the hydrogen gas generating unit 220 is at least one of a plurality of gas processors 201. of the gas processor 201E, and the reducing gas generator 210 may be configured to include the remaining gas processors 201A to 201D. Here, although the fifth gas processor 201E among the plurality of gas processors 201 is described as being used as the hydrogen gas generator 201E, at least one of the first to fifth gas processors 201A to 201E is used as the hydrogen gas generator. (201E) can also be used. Hereinafter, the first to fourth gas processors 201A to 201D are referred to as reducing gas generators 201A to 201D, and the fifth gas processor 201E is referred to as a hydrogen gas generator 201E. At this time, the reducing gas produced in the reducing gas generators 201A to 201D may be mainly used to produce reduced iron. Therefore, it is necessary to secure a greater number of reducing gas generators 201A to 201D than the number of hydrogen gas generators 201E so as to sufficiently supply reducing gas to the fluidized reduction reactor 110 . In this case, the number of reducing gas generators 201A to 201D and the number of hydrogen gas generators 201E may be installed to have a ratio of about 3 to 4:1. When the ratio of the reducing gas generators 201A to 201D is large, the production amount of hydrogen gas is small, or hydrogen gas cannot be produced smoothly. On the other hand, if the ratio of the reducing gas generators 201A to 201D is small, the flow rate of the reducing gas supplied to the fluidized reduction furnace 110 is low, making it impossible to smoothly produce reduced iron.

The reducing gas generator 210 includes four reducing gas generators 201A to 201D, an exhaust gas supply pipe 211 for supplying exhaust gas to each of the reducing gas generators 201A to 201D, and a reducing gas generator 201A to 201D. It may include a first recovery pipe 218 connected to the reducing gas generators 201A to 201D to recover the reducing gas produced in) and a first discharge pipe 215 for discharging carbon dioxide adsorbed from the exhaust gas.

The four reducing gas generators 201A to 201D are a first reducing gas generator 201A, a second reducing gas generator 201B, a third reducing gas generator 201C and a fourth reducing gas generator 201D arranged in parallel. can include The exhaust gas supply pipe 211 may be connected to lower portions of the four reducing gas generators 201A to 201D, and the first recovery pipe 218 may be connected to upper portions of the four reducing gas generators 201A to 201D. The first recovery pipe 218 may be connected to the four reducing gas generators 201A to 201D to collect the reducing gas produced by the four reducing gas generators 201A to 201D. Also, the exhaust gas supply pipe 211 may be connected to the first circulation pipe 151, and the first recovery pipe 218 may be connected to the second circulation pipe 153. The first discharge pipe 215 may be connected to lower portions of the first to fourth reducing gas generators 201A to 201D, respectively.

The hydrogen gas generator 220 includes at least one hydrogen gas generator 201E, a reducing gas supply pipe 221 for supplying reducing gas to the hydrogen gas generator 201E, and a second recovery for recovering hydrogen gas. It may include a pipe 228 and a second discharge pipe 225 for discharging carbon monoxide and nitrogen adsorbed from the reducing gas. In addition, the hydrogen gas generator 220 may include a control valve 2211 installed in the reducing gas supply pipe 221 to adjust the flow rate of the reducing gas supplied to the hydrogen gas generator 201E.

The hydrogen gas generator 201E may be arranged in parallel with the four reducing gas generators 201A to 201D. The reducing gas supply pipe 221 may be connected to the first recovery pipe 218 and the hydrogen gas generator 201E. In this case, the end of the reducing gas supply pipe 221 connected to the first recovery pipe 218 may be connected to one end of the first recovery pipe 218 connected to the second circulation pipe 153. The reducing gas discharged from the first reducing gas generator 201A, the second reducing gas generator 201B, the third reducing gas generator 201C, and the fourth reducing gas generator 201C is collected in the first recovery pipe 218. After that, it can be transported to the second circulation pipe 153. For example, when the collected reducing gas moves from the fourth reducing gas generator 201D to the first reducing gas generator 201A, the end of the reducing gas supply pipe 221 moves from the first recovery pipe 218 to the first reducing gas generator 201A. It may be connected between the part connected to the generator 201A and the part connected to the second circulation pipe 153.

The control unit 230 may control the overall operation of the gas processing device 200, and in particular, the operation of various valves installed in the reducing gas generators 201A to 201D and the hydrogen gas generator 201E. In addition, the control unit 230 controls the operation of the control valve 2211 of the hydrogen gas generator 201E to determine whether or not to supply the reducing gas to the hydrogen gas generator 201E, or the reducing gas to be supplied to the hydrogen gas generator 201E. supply flow rate can be adjusted.

The gas processing apparatus according to the embodiment of the present invention may separate a part of the reducing gas produced from the plurality of reducing gas generators 201A to 201D and supply the separated gas to the hydrogen gas generator 201E. However, in addition to this, the reducing gas generated in the reducing gas generators 201A to 201D may be separated and supplied to the hydrogen gas generator 201E in various ways.

Hereinafter, a gas processing device according to modified examples of the present invention will be described. Modified examples may be formed in a structure similar to the gas processing device according to the above-described embodiment, except for the method of supplying the reducing gas to the hydrogen gas generator 201E.

3 is a diagram schematically showing a gas processing device according to a first modified example of the present invention.

Referring to FIG. 3 , the reducing gas generator 210 includes a plurality of reducing gas generators 201A to 201D and a plurality of first recovery devices connected to the plurality of reducing gas generators 201A to 201D to recover the reducing gas. A plurality of first control valves 219 respectively formed in the pipe 218 and the plurality of first recovery pipes 218 may be included.

The plurality of first recovery pipes 218 include a 1-1 recovery pipe 218a connected to the first reduction gas generator 201A and a 1-2 recovery pipe connected to the second reduction gas generator 201B ( 218b), 1-3 recovery pipes 218c connected to the third reduction gas generator 201C, and 1-4 recovery pipes 218d connected to the 4th reduction gas generator 201D. . The reducing gas is collected at the ends of the 1-1 to 1-4 recovery pipes 218a to 218d so that the reducing gas recovered by the 1-1 to 1-4 recovery pipes 218a to 218d can be collected. A main recovery pipe 218A for this may be connected. The main recovery pipe 218A may be connected to the second circulation pipe 153. In addition, ends of the 1-1 to 1-4 recovery pipes 218a to 218d may be directly connected to the second circulation pipe 153.

The first control valve 219 includes a 1-1 control valve 219a installed in the 1-1 recovery pipe 218a and a 1-2 control valve installed in the 1-2 recovery pipe 218b ( 219b), and the 1-3 control valve 219c installed in the 1-3 recovery pipe 218c and the 1-4 control valve 219d installed in the 1-4 recovery pipe 218d. can

The hydrogen gas generator 220 includes at least one hydrogen gas generator 201E, a plurality of reducing gas supply pipes 221 and a plurality of reducing gas supply pipes 221 for supplying reducing gas to the hydrogen gas generator 201E. ) may include a plurality of second control valves 2211 each formed on the

The plurality of reducing gas supply pipes 221 supply a first reducing gas supply pipe 221a connected to the 1-1 recovery pipe 218a and a second reducing gas supply pipe connected to the 1-2 recovery pipe 218b. The pipe 221b, the third reducing gas supply pipe 221c connected to the 1-3 recovery pipe 218c, and the fourth reducing gas supply pipe 221d connected to the 1-4 recovery pipe 218d can include

In addition, the reducing gas supply pipe 221 may include a main reducing gas supply pipe 221A connecting the first to fourth reducing gas supply pipes 221a to 221d and the hydrogen gas generator 201E. The main reducing gas supply pipe 221A may collect the reducing gas separated through the first to fourth reducing gas supply pipes 221a to 221d and supply the collected reduced gas to the hydrogen gas generator 201E. Here, it is described that the first to fourth reducing gas supply pipes 221a to 221d are connected to the hydrogen gas generator 201E through the main reducing gas supply pipe 221A, but the first to fourth reducing gas supply pipes ( 221a to 221d) may be directly connected to the hydrogen gas generator 201E.

The second control valve 2211 includes a 2-1 control valve 2211a installed in the first reduction gas supply pipe 221a and a 2-2 control valve installed in the second reduction gas supply pipe 221b ( 2211b), a 2-3 control valve 2211c installed in the third reduction gas supply pipe 221c and a 2-4 control valve 2211d installed in the fourth reduction gas supply pipe 221d. can

4 is a diagram schematically showing a gas processing device according to a second modified example of the present invention.

Referring to FIG. 4, the reducing gas generator 210 is connected to a plurality of reducing gas generators 201A to 201D and some of the reducing gas generators 201A and 201B of the plurality of reducing gas generators 201A to 201D. A first recovery pipe 218 may be included.

The first recovery pipe 218 may be connected to the first and second reducing gas generators 201A and 201B among the first to fourth reducing gas generators 201A to 201D. Here, it is described that the first recovery pipe 201A is connected to the first and second reducing gas generators 201A and 201B, but is not limited thereto, and at least two of the first to fourth reducing gas generators 201A to 201D are described. Can be associated with dogs.

The hydrogen gas generator 220 is connected to at least one hydrogen gas generator 201E, some of the reducing gas generators 201C and 201D and the hydrogen gas generator 201E among the plurality of reducing gas generators 201A to 201D. A reducing gas supply pipe 221 and a control valve 2211 installed in the reducing gas supply pipe 221 may be included. In this case, the reducing gas supply pipe 221 may be connected to the third and fourth reducing gas generators 201C and 201D that are not connected to the first recovery pipe 218 . Although the drawing shows that the reducing gas supply pipe 221 is connected to the third and fourth reducing gas generators 201C and 201D, it may be connected to only one of the first to fourth reducing gas generators 201A to 201D. there is.

On the other hand, the hydrogen gas generator 220 includes a bypass pipe 229 for connecting the reducing gas supply pipe 221 and the first recovery pipe 218, and an auxiliary valve 229a installed in the bypass pipe 229. ) may be included. At this time, the bypass pipe 229 flows into the reducing gas supply pipe 221 when there is too much reducing gas produced in the third and fourth reducing gas generators 201C and 201D or when production of hydrogen gas is stopped. At least some of the reduced gas may be sent to the first recovery pipe 218 to be combined with the reduced gas produced in the first and second reduced gas generators 201A and 201B.

Hereinafter, the structure and operation method of a gas processor according to an embodiment of the present invention will be described.

5 is a view showing a detailed structure of a gas processor according to an embodiment of the present invention. The reducing gas generator 210 includes at least two gas processors, but only one gas processor is shown in FIG. 5 . In addition, each gas treatment unit may include at least two adsorption towers, but here it is described as including four adsorption towers. In addition, the gas processors forming the reducing gas generator 210 are referred to as reducing gas generators 201A to 201D, and the gas processors constituting the hydrogen gas generator 220 are referred to as hydrogen gas generators 201E.

Referring to FIG. 5, the reducing gas generators 201A to 201D include four first adsorption towers 2011, and the reducing gas is supplied while alternately or sequentially performing processes of carbon dioxide adsorption, depressurization, washing, and pressure equalization. can be manufactured For example, the first adsorption tower 2011 is composed of a 1-1 adsorption tower 2011a, a 1-2 adsorption tower 2011b, a 1-3 adsorption tower 2011c and a 1-4 adsorption tower 2011d, While carbon dioxide contained in exhaust gas is adsorbed in the first adsorption tower (2011a), depressurization and cleaning of the adsorbent may be performed in the first and second adsorption towers (2011b). In addition, the 1-3 adsorption towers 2011c and 1-4 adsorption towers 2011d may perform a pressure equalization process. The reducing gas generators 201A to 201D may alternately produce reducing gas while sequentially performing these processes in the 1-1st adsorption towers 2011a to 1-4th adsorption towers 2011d.

The reducing gas generators 201A to 201D include an exhaust gas supply pipe 211 connected to the first circulation pipe 151, a plurality of first adsorption towers 2011 connected to the exhaust gas supply pipe 211, and carbon dioxide adsorbed from the exhaust gas. It may include a first discharge pipe 215 for discharging and a first recovery pipe 218 for recovering the reducing gas discharged from the first adsorption tower 2011. At this time, a first compressor 212 may be installed in the exhaust gas supply pipe 211, and a first vacuum pump 214 may be installed in the first discharge pipe 215 to adjust the internal pressure of the plurality of first adsorption towers 2011. can be installed In addition, a first recovery pipe 218 for recovering the reducing gas discharged from the first adsorption tower 2011 and a plurality of first connection pipes (not shown) are formed in the first recovery pipe 218. Valves 213, 214, 216, and 217 may be installed for each connecting pipe.

The first adsorption tower (2011) is composed of the 1-1 to 1-4 adsorption towers (2011a to 2011d) arranged in parallel, and the exhaust gas is supplied to the lower end of each of the 1-1 to 1-4 adsorption towers (2011a to 2011d). A 1-1 connection pipe may be formed to connect the pipe 211 and the 1-1 to 1-4 adsorption towers 2011a to 2011d, respectively. In addition, the first valve 213 may be installed in each of the 1-1 connection pipes. In addition, 1-2 connection pipes may be formed at the lower portions of the 1-1 to 1-4 adsorption towers 2101 to 2104 to connect the first discharge pipe 215 and the first connection pipe, respectively. Second valves 214 may be respectively installed in the two connection pipes. At this time, the 1st-2nd connection pipe may connect the first discharge pipe 215 and between the first adsorption tower 2011a and the first valve 213.

At the upper end of the first adsorption tower 2011a, first-third connection pipes may be formed to connect the first recovery pipe 218 and the first adsorption tower 2011a, respectively. A third valve 217 capable of opening and closing the 1-3 connection pipe may be installed in the 1-3 connection pipe. In addition, a plurality of 1-4 connection pipes interconnecting the 1-1 to 1-4 adsorption towers 2011a to 2011d may be formed in the 1-3 connection pipe, and the 1-4 connection pipe may have a first A fourth valve 216 may be installed to independently supply gas to each of the 1-1 to 1-4 adsorption towers 2011a to 2011d.

The reducing gas generators 201A-201D may operate in the following manner.

First, exhaust gas containing hydrogen is supplied into the 1-1 adsorption tower 2101 through the exhaust gas supply pipe 211. At this time, as for the first valve 213, only the 1-1 valve 2131 connected to the 1-1 adsorption tower 2011a is open. When the exhaust gas is supplied into the 1-1 adsorption tower 2011a, carbon dioxide contained in the exhaust gas is adsorbed to the adsorbent and can be produced as a reducing gas. At this time, the reducing gas may include carbon monoxide, nitrogen and hydrogen. The reducing gas produced in the 1-1 adsorption tower 2011a may be recovered through the first recovery pipe 218.

At the same time, in the 1-2 adsorption tower 2011b, the 2-1 valve 2141 installed in the 1-2 connection pipe connected to the 1st discharge pipe 215 is opened, and the countercurrent pressure is reduced to below atmospheric pressure. In addition, the 1-3 adsorption tower (2011c) and the 1-4 adsorption tower (2011d) are co-currently depressurized so that the internal pressures of the 1-3 adsorption tower (2011c) and the 1-4 adsorption tower (2011d) can be equalized. there is. At this time, the fourth valve 216 is connected to the 1-3 adsorption tower 2011c so that the gas can be discharged through the 1-4 adsorption tower 2011d and supplied to the 1-3 adsorption tower 2011c. One of the -3 valves 2163a to 2163d and one of the 4-4 valves 2164a to 2164d connected to the 1-4 adsorption tower 2011d may be opened. Here, the countercurrent pressure reduction means reducing the pressure by discharging the gas in the direction opposite to the direction in which the exhaust gas moves in the first adsorption tower 2011a, and the cocurrent pressure reduction means reducing the pressure in the same direction as the direction in which the exhaust gas moves in the first adsorption tower 2011a. It means to release the gas and reduce the pressure.

When the internal pressures of the 1-4 adsorption towers 2011d and 1-3 adsorption towers 2011c become the same, the 1-4 adsorption tower 2011d opens one valve 2164a of the 4-4 valves 2164. A cleaning process step of supplying a large amount of exhaust gas as a cleaning gas to the 1-2 adsorption towers 2011b is performed while the co-current pressure is reduced.

The 1-2 adsorption tower 2011b opens one 2162a of the 4-2 valves 2162 connected to the 1-2 adsorption tower 2011b and the 2-2 valve 2142, so that the 1-4 The adsorbent inside can be cleaned by receiving the gas supplied from the adsorption tower 2011d. And the 1-3 adsorption tower (2011c) closes one (2163b) of the 4-3 valves (2163) and opens the valve (2163c) of the same connection pipe to introduce reducing gas in the countercurrent direction, The pressure of the adsorption tower 2011c can reach the adsorption pressure. After cleaning the 1-2 adsorption tower 2011b using the gas discharged from the 1-4 adsorption tower 2011d, closing the 2-2 valve 2142 connected to the 1-2 adsorption tower 2011b , The 1-4 adsorption tower 2011d and the 1-2 adsorption tower 2011b may be connected to each other through the opened 4-2 valve 2162b and 4-4 valve 2164b to equalize pressure. At this time, the 1-1 adsorption tower 2011a and the 1-3 adsorption tower 2011c continue to carry out the adsorption and pressure accumulation steps individually. When the adsorption of carbon dioxide is completed in the 1-1 adsorption tower 2011a, the 1-1 valve 2131 connected to the 1-1 adsorption tower 2011a and the 3-1 valve 2171 are closed, , by opening the 4-1 valve 2161b connected to the 1-1 adsorption tower 2011a and the 4-2 valve 2162b connected to the 1-2 adsorption tower 2011b to open the 1-1 adsorption tower 2011a ) and the pressure equalization of the 1-2 adsorption tower (2011b).

This process may be alternately repeated in the 1-2 to 1-4 adsorption towers 2011a to 2011d to produce reducing gas. In addition, the reducing gas is produced in the plurality of reducing gas generators 201A to 201D in the same way, and the reducing gas produced in each of the reducing gas generators 201A to 201D can be collected into the first recovery pipe 218. there is.

In addition, the hydrogen gas generator 201E includes four second adsorption towers 2012, and the four second adsorption towers 2012 alternately or sequentially perform processes of adsorption of carbon monoxide and nitrogen, decompression, cleaning, and pressure equalization while producing hydrogen gas.

The hydrogen gas generator 201E includes a reducing gas supply pipe 221 connected to the first recovery pipe 218, a control valve 2211 installed in the reducing gas supply pipe 221, and a reducing gas supply pipe 221 A plurality of second adsorption towers 2012 connected to, a second compressor 221 installed in the reducing gas supply pipe 221 to compress and supply reducing gas to the second adsorption tower 2012, and carbon monoxide adsorbed from the reducing gas And a second discharge pipe 225 for discharging nitrogen, a second vacuum pump 221 installed in the second discharge pipe 225 to adjust the internal pressure of the plurality of second adsorption towers 2012, and a second adsorption tower ( 2012), a plurality of second recovery pipes 228 for recovering hydrogen gas, a plurality of second adsorption towers 2012, a plurality of second recovery pipes 228, and a plurality of second discharge pipes 225 connecting It may include a connection pipe (not shown) and a plurality of valves 223 to 227 for opening and closing a plurality of second connection pipes.

The hydrogen gas generator 201E may generate hydrogen gas in the same manner as the reducing gas generators 201A to 201D. That is, the reducing gas generators 201A to 201D and the hydrogen gas generator 201E can operate in the same way, with only differences in the type of adsorbent filled in the adsorption tower and the object to be adsorbed from the gas. Therefore, description of the specific operating method of the hydrogen gas generator 201E is omitted.

The control unit 230 generally controls the gas treatment device 200 and, in particular, controls the operation of the control valve 2211 to adjust the flow rate of the reducing gas to be supplied to the hydrogen gas generator 201E.

Hereinafter, a method for producing hydrogen gas according to an embodiment of the present invention will be described.

A method for producing hydrogen gas according to an embodiment of the present invention includes a process of preparing exhaust gas generated in a steelmaking process, a process of removing carbon dioxide from the exhaust gas to produce a reducing gas containing carbon monoxide, nitrogen and hydrogen gas, and subsequent treatment It may include a process of determining the flow rate of the reducing gas to be used, a process of separating the reducing gas as much as the determined flow rate, and a process of producing hydrogen gas by removing carbon monoxide and nitrogen from the separated reducing gas. Here, a method of producing hydrogen gas using flue gas generated in the process of producing reduced iron during the steelmaking process will be described.

First, iron ore may be charged into the fluidized reduction reactor 110 and reduced iron may be produced by supplying a reducing gas. And the flue gas generated in the process of producing reduced iron is discharged from the fluidized reduction furnace 110, and the gas treatment device through a circulation pipe 150 connected to the fluidized reduction furnace 110, for example, the first circulation pipe 151 ( 200) can be supplied. At this time, the exhaust gas discharged from the fluidized reduction furnace 110 contains about 10 to 20% of hydrogen (H ₂ ), about 30 to 40% of carbon monoxide (CO), about 30 to 40% of carbon dioxide (CO ₂ ), and Nitrogen (N ₂ ) of about 10 to 20% may be included.

Exhaust gas generated in the fluidized reduction reactor 110 may be made of reducing gas and hydrogen gas for reducing iron ore. It is possible to determine the flow rate of the reducing gas to be used to produce exhaust gas generated in the fluidized reduction reactor 110 as reducing gas and to produce hydrogen gas from the produced reducing gas. At this time, since a large amount of reducing gas is required to reduce iron ore in the fluidized reduction reactor 110, some of the produced reducing gas may be used to produce hydrogen gas. Accordingly, the flow rate of the reducing gas for producing hydrogen gas may be determined to be about 5 to 15% or about 7 to 10% of the total flow rate of the reducing gas produced using the exhaust gas. If hydrogen gas is produced using an excessively small flow rate of reducing gas among all reducing gases, it is difficult to smoothly produce hydrogen gas or insufficient hydrogen gas cannot be produced. On the other hand, if an excessively large flow rate of reducing gas among the total reducing gases is used to produce hydrogen gas, the flow rate of reducing gas supplied to the fluidized reduction reactor 110 decreases, making it difficult to sufficiently reduce iron ore. Here, it has been described that the flow rate of the reducing gas to be used for producing hydrogen gas is determined after the process of preparing the exhaust gas, but these processes may be performed regardless of the order. In addition, the process of determining the flow rate of the reducing gas may be performed in the process of producing the reducing gas and hydrogen thereafter, and in this case, the predetermined flow rate of the reducing gas may be reduced or increased within a suggested range.

The process of separating the reducing gas may be performed as follows. Referring to FIG. 2 , exhaust gas is supplied to the plurality of reducing gas generators 201A to 201D through the exhaust gas supply pipe 211 connected to the first circulation pipe 151 . When exhaust gas is supplied to the plurality of reducing gas generators 201A to 201D, the exhaust gas passes through each of the reducing gas generators 201A to 201D, and the adsorbent and come into contact Through this, carbon dioxide contained in exhaust gas can be adsorbed and removed by the adsorbent, and exhaust gas from which carbon dioxide is removed, that is, reduced gas can be produced. In addition, the reducing gas may be discharged from the reducing gas generators 201A to 201D and returned to the first recovery pipe 218 . The reducing gas discharged from the plurality of reducing gas generators 201A to 201D may be collected in the first recovery pipe 218 connected to the plurality of reducing gas generators 201A to 201D. At this time, the reducing gas is about 20 to 30% of hydrogen (H ₂ ), about 35 to 45% of carbon monoxide (CO ), about 2 to 5% of carbon dioxide (CO ₂ ) and about 20 to 30% of nitrogen ( N ₂ ).

And, the reducing gas collected in the first recovery pipe 218 is separated by the amount determined by the reducing gas supply pipe 221 connected to the first recovery pipe 218 and supplied to the hydrogen gas generator 201E, and the remaining reducing gas may be transferred along the second circulation pipe 153 connected to the first recovery pipe 218 and supplied to the fluidized reduction furnace 110. At this time, the reducing gas collected in the first recovery pipe 218 may be separated by a determined flow rate using the control valve 2211 and introduced into the reducing gas supply pipe 221 .

The reducing gas separated through the reducing gas supply pipe 221 may be supplied to the hydrogen gas generator 201E, and carbon monoxide and nitrogen contained in the reducing gas may be adsorbed on an adsorbent to produce hydrogen gas. In addition, hydrogen gas may be discharged from the hydrogen gas generator 201E, recovered through the second recovery pipe 228, and supplied to the hydrogen storage tank 300 connected to the second recovery pipe 228 for storage. At this time, the hydrogen gas produced in the hydrogen gas generator 201E contains about 80 to 90% of hydrogen (H ₂ ), about 1 to 10% of carbon monoxide (CO), and about 0 to 1% of carbon dioxide (CO ₂ ). And about 10 to 20% of nitrogen (N ₂ ) It may include. Here, the hydrogen gas means a gas containing 80% or more of hydrogen, and does not mean pure hydrogen gas. When the second adsorption tower 2012 of the hydrogen gas generator 201E is additionally filled with an adsorbent capable of adsorbing nitrogen and carbon monoxide in addition to the adsorbent capable of adsorbing carbon dioxide, in addition to nitrogen and carbon monoxide, in the reducing gas generators 201A to 201D Carbon dioxide not already removed may be additionally removed. The hydrogen gas generator 201E may discharge carbon monoxide (CO) and nitrogen (N ₂ ) adsorbed when producing hydrogen gas to the outside through the second discharge pipe 225 connected to the hydrogen gas generator 201E. Here, the outside does not mean in the air, and may mean a separate processing space or container. Carbon monoxide and nitrogen discharged from the hydrogen gas generator 201E may be transferred to the second circulation pipe 153 and combined with reducing gas, or may be used as fuel gas in other steelmaking processes.

In the above, it has been described that all the reducing gases produced in the plurality of reducing gas generators 201A to 201D are collected and then some of them are separated, but in addition, they are separated in various ways and supplied to the hydrogen gas generator 201E.

Referring to FIG. 3 , exhaust gas is supplied to the plurality of reducing gas generators 201A to 201D through the exhaust gas supply pipe 211 connected to the first circulation pipe 151 . When exhaust gas is supplied to the plurality of reducing gas generators 201A to 201D, the exhaust gas passes through each of the reducing gas generators 201A to 201D, and the adsorbent and come into contact Through this, carbon dioxide contained in exhaust gas can be adsorbed and removed by the adsorbent, and exhaust gas from which carbon dioxide is removed, that is, reduced gas can be produced. In addition, the reducing gas may be discharged from the reducing gas generators 201A to 201D and returned to the first recovery pipe 218 . At this time, the reducing gas discharged from the first to fourth reducing gas generators 201A to 201D is passed through the 1-1 to 1-4 recovery pipes 218a to 218d connected to the respective reducing gas generators 201A to 201D. can be recovered with

And the reducing gas recovered from the 1-1 to 1-4 recovery pipes 218a to 218d is installed in the 1-1 to 1-4 recovery pipes 218a to 218d. Collected from the main return pipe 218A according to the operation of the 4 control valves 219a to 219d and the 2-1 to 2-4 control valves 2211a to 2211d installed in the reducing gas supply pipes 221a to 221d Alternatively, it may be introduced into the reducing gas supply pipes 221a to 221d and then supplied to the hydrogen gas generator 201E.

The reducing gas discharged from the reducing gas generators 201A to 201D may be separated by various methods and supplied to the hydrogen gas generator 201E.

First, it is assumed that the 1-1 to 1-4 recovery pipes 218a to 218d and the reducing gas supply pipes 221a to 221d are all opened by the first control valve 219 and the second control valve 2211. Assuming that, a method for separating the reducing gas will be described.

First, a portion of the reducing gas discharged from each of the reducing gas generators 201A to 201D passes through the 1-1 to 1-4 recovery pipes 218a to 218d and is collected in the main recovery pipe 218A, A portion passes through the first to fourth reducing gas supply pipes 221a to 221d through the 1-1 to 1-4 recovery pipes 218a to 218d and is collected in the main reducing gas supply pipe 221A, followed by hydrogen. It can be supplied to the gas generator 201E. At this time, the flow rate of the reducing gas moving to the main recovery pipe 218A and the hydrogen gas generator 201E may be adjusted by controlling the operations of the first control valve 219 and the second control valve 2211 . That is, by controlling the operation of the second control valve 2211, a reducing gas corresponding to the determined flow rate may be supplied to the hydrogen gas generator 201E. In this case, if the reducing gas of the determined flow rate can be separated and supplied to the hydrogen gas generator 201E, the 1-1 to 1-4 control valves 219a to 219d and the 2-1 to 2-4 control valves By controlling the operation of the valves 2211a to 2211d, the same flow rate of reducing gas may be introduced into each of the first to fourth reducing gas supply pipes 221a to 221d, and a different flow rate of reducing gas may be introduced into at least one of the first to fourth reducing gas supply pipes 221a to 221d. may be

Second, a plurality of reducing gas generators ( 201A to 201D), the reducing gas produced by some of the reducing gas generators may be supplied to the hydrogen gas generator 201E. For example, the 1-4 recovery pipe 218d is closed by the 1-4 valve 219d, and the 1st to 3rd reduction gas supply pipes are closed by the 2-1 to 2-3 control valves 2211a to 2211c. (221a ~ 221c) can be closed. In this case, the reducing gas discharged from the first to third reducing gas generators 201A to 201C is collected in the main recovery pipe 218A through the 1-1 to 1-3 recovery pipes 218a to 218c, and then , It can be moved to the second circulation pipe (153). In addition, the reducing gas discharged from the fourth reducing gas generator 201D may flow into the fourth reducing gas supply pipe 221d and be supplied to the hydrogen gas generator 201E.

Third, it may happen that at least one of the first to fourth reducing gas generators 201A to 201D does not operate normally. In this case, it is possible to block the inflow of reducing gas into a partial area of the first recovery pipe 219 and a partial area of the reducing gas supply pipe 221 connected to the reducing gas generator that does not operate normally. For example, when the first reducing gas generator 201A does not operate normally, the 1-1 recovery pipe 218a and the first control valve 219a and the 2-1 control valve 2211a are used. By closing the reducing gas supply pipe 221a, the gas discharged from the first reducing gas generator 201A is prevented from flowing into the 1-1 recovery pipe 218a and the first reducing gas supply pipe 221a. It can be prevented. In addition, it is also possible to prevent the reducing gas discharged from the second to fourth reducing gas generators 201B to 201D from flowing into the 1-1 recovery pipe 218a and the first reducing gas supply pipe 221a. Accordingly, reducing gas may be produced in a normally operating reducing gas generator, and hydrogen gas may be produced using the reducing gas. Through this, even when at least one of the first to fourth reducing gas generators 201A to 201D does not operate normally, reducing gas and hydrogen gas may be continuously produced without stopping operation.

In addition, hydrogen gas may be produced using a reducing gas produced only in some reducing gas generators among the plurality of reducing gas generators 201A to 201D.

Referring to FIG. 4 , exhaust gas is supplied to the plurality of reducing gas generators 201A to 201D through the exhaust gas supply pipe 211 connected to the first circulation pipe 151 . When exhaust gas is supplied to the plurality of reducing gas generators 201A to 201D, the exhaust gas passes through each of the reducing gas generators 201A to 201D, and the adsorbent and come into contact Through this, carbon dioxide contained in exhaust gas can be adsorbed and removed by the adsorbent, and exhaust gas from which carbon dioxide is removed, that is, reduced gas can be produced. The reducing gas produced by the first and second reducing gas generators 201A and 201B is recovered through the first recovery pipe 218, and the reducing gas produced by the third and fourth reducing gas generators 201C and 201D It can be recovered from the reducing gas supply pipe 221. At this time, the reducing gas discharged from the first and second reducing gas generators 201A and 201B is recovered and collected through the first recovery pipe 218, and then passed through the second circulation pipe 153 to the fluidized reduction furnace 110 can supply to Also, the reducing gas discharged from the third and fourth reducing gas generators 201C and 201D may be supplied to the hydrogen gas generator 201E through the reducing gas supply pipe 221 . At this time, the flow rate of the reducing gas supplied to the hydrogen gas generator 201E may be adjusted using the control valve 2211 installed in the reducing gas supply pipe 221 . At this time, since the reducing gas discharged from the third and fourth reducing gas generators 201C and 201D is collected in the reducing gas supply pipe 221 and supplied to the hydrogen gas generator 201E, the flow rate of the collected reducing gas is hydrogen It may be greater than the flow rate of the reducing gas required to produce the gas. Accordingly, surplus reducing gas may be transferred to the first recovery pipe 218 through the bypass pipe 229 connecting the reducing gas supply pipe 221 and the first recovery pipe 218 . The bypass pipe 229 may be maintained in a closed state by the auxiliary valve 229a and opened when excessive reducing gas is generated.

On the other hand, since the reducing gas generators 201A to 201D and the hydrogen gas generator 201E are arranged in parallel, when the reducing gas is supplied from the first reducing gas generator 201A farthest from the hydrogen gas generator 201E, the reducing gas A pressure loss may occur in the process of transferring the to the hydrogen gas generator 201E. Therefore, it is preferable to supply the reducing gas produced in the third reducing gas generator 201C or the fourth reducing gas generator 201D installed adjacent to the hydrogen gas generator 201E to the hydrogen gas generator 201E.

Although the technical idea of the present invention has been specifically described according to the above embodiments, it should be noted that the above embodiments are for explanation and not for limitation. In addition, those skilled in the art will understand that various embodiments are possible within the scope of the technical spirit of the present invention.

200: gas processing device 201: gas processing device
201A-201D: reducing gas generator 201E: hydrogen gas generator
230: control unit 300: hydrogen storage tank

Claims (20)

A gas processing device including a plurality of gas processing devices,
a reducing gas generator including at least two gas processors among the plurality of gas processors and producing reducing gas from flue gas generated in the steelmaking process;
a hydrogen gas generator including remaining gas processors among the plurality of gas processors and connected to the reducing gas generator to produce hydrogen gas; and
A control unit for controlling whether or not to supply and the flow rate of the reducing gas supplied from the reducing gas generating unit to the hydrogen gas generating unit;
The gas treatment unit of the hydrogen gas generator is a hydrogen gas generator including an adsorbent capable of adsorbing carbon monoxide and nitrogen from a reducing gas,
The gas treatment unit of the reducing gas generator is a reducing gas generator including an adsorbent capable of adsorbing carbon dioxide from exhaust gas,
The reducing gas generator includes a recovery pipe connected to some of the reducing gas generators among the plurality of reducing gas generators,
The hydrogen gas generator includes a remaining reducing gas generator not connected to the recovery pipe, a reducing gas supply pipe connected to the hydrogen gas generator, and a valve installed on the reducing gas supply pipe,
The control unit is a gas processing device capable of controlling the operation of the valve. delete The method of claim 1,
The plurality of gas processors are arranged in parallel and have the same structure. delete The method of claim 3,
Each of the plurality of gas processors includes at least two adsorption towers capable of communicating with each other,
Each of the at least two adsorption towers has the same structure. delete delete delete delete The method of claim 3,
Further comprising a bypass pipe connected to the reducing gas supply pipe and the recovery pipe,
One side of the bypass pipe is connected between the valve and the reducing gas generator. According to any one of claims 1, 3, 5 and 10,
The hydrogen gas generator and the reducing gas generator are installed at a ratio of 1: 3 to 4. A hydrogen gas production method for producing hydrogen gas using the gas processing device according to claim 1,
The process of preparing flue gas generated in the steelmaking process;
supplying the exhaust gas to at least two gas processors among the plurality of gas processors, and removing carbon dioxide from the exhaust gas to produce reducing gas containing carbon monoxide, nitrogen, and hydrogen gas;
determining a flow rate of reducing gas to be subsequently treated;
Separating reducing gas as much as the determined flow rate; and
Supplying the separated reducing gas to at least one gas processor among the plurality of gas processors, and removing carbon monoxide and nitrogen from the separated reducing gas to produce hydrogen gas; includes,
The step of separating the reducing gas includes separating at least a portion of the reducing gas from at least one gas processor that is not connected to each other among the at least two gas processors. The method of claim 12,
The process of producing the reducing gas,
Including; adsorbing carbon dioxide contained in the exhaust gas,
The process of producing the hydrogen gas,
A method for producing hydrogen gas comprising: adsorbing carbon monoxide and nitrogen contained in the reducing gas. delete delete delete The method of claim 12,
and combining a portion of the separated reducing gas with a reducing gas produced in the remaining gas processors among the at least two gas processors when the flow rate of the separated reducing gas is greater than the determined flow rate. delete According to any one of claims 12, 13 and 17,
The process of determining the flow rate of the reducing gas,
Hydrogen gas production method of determining the flow rate of the reducing gas for producing hydrogen gas is 5 to 15% with respect to 100% of the total flow rate of the reducing gas produced in the process of producing the reducing gas. According to any one of claims 12, 13 and 17,
The process of preparing the flue gas,
preparing reduced iron by charging iron ore into a fluidized reduction furnace and supplying a reducing gas; and
Method for producing hydrogen gas comprising a; process of discharging exhaust gas generated in the process of producing the reduced iron from the fluidized reduction furnace.

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