KR102001213B1 - Fuel cell system having hydrogen generating and carbon dioxide removing apparatus using carbon dioxide - Google Patents

Abstract

The present invention relates to an apparatus for generating hydrogen and removing carbon dioxide, which comprises: a hydrogen generator including a reaction space, an electrolyte aqueous solution accommodated in the reaction space and containing chlorine anions, a reduction electrode at least partially immersed in the electrolyte aqueous solution in the reaction space, and an oxidation electrode at least partially immersed in the electrolyte aqueous solution in the reaction space; and a power source for applying DC electricity to the hydrogen generator, and including a negative electrode electrically connected to the reduction electrode and a positive electrode electrically connected to the oxidation electrode. The DC electricity is applied to the hydrogen generator by the power source and carbon dioxide gas is introduced into the electrolyte aqueous solution, such that hydrogen ions and bicarbonate ions are generated by a reaction of water of the electrolyte aqueous solution and the carbon dioxide gas. Moreover, the hydrogen ions and electrons of the reduction electrode are combined in the reduction electrode to generate hydrogen gas, and a chlorine generation reaction that electrons are separated from the chlorine ions to generate chlorine gas, occurs in the oxidation electrode.

Description

FUEL CELL SYSTEM HAVING HYDROGEN GENERATING AND CARBON DIOXIDE REMOVING APPARATUS USING CARBON DIOXIDE}

The present invention relates to a hydrogen generating and carbon dioxide removal apparatus and a fuel cell system having the same, and more particularly, to a hydrogen generating and carbon dioxide removing apparatus using carbon dioxide and a fuel cell system having the same.

With the recent industrialization, greenhouse gas emissions have been continuously increasing, and carbon dioxide accounts for the largest portion of greenhouse gases. Carbon dioxide emissions by industry type are the highest in energy sources such as power plants, and carbon dioxide from cement, steel, and refining industries, including power generation, accounts for half of the world's production. CO2 conversion / utilization can be classified into chemical conversion, biological conversion, and direct utilization, and the technical categories can be categorized into catalyst, electrochemical, bioprocess, light utilization, inorganic (carbonate), and polymer. Since carbon dioxide is produced in various industries and processes, and a single technology cannot achieve carbon dioxide reduction, various approaches for carbon dioxide reduction are required.

Currently, the US Department of Energy Department of Energy (DOE) is focusing on CCUS technology that combines Carbon Capture & Storage (CCS) and CC & Utilization (CCU) as a technology to reduce carbon dioxide. CCUS technology is recognized as an effective GHG reduction measure, but faces high investment costs, the possibility of release of harmful trapping agents into the air, and low technology maturity. In addition, from an energy and climate policy perspective, CCUS provides a means to substantially reduce greenhouse gas emissions, but there are many complements to the realization of technology. Therefore, there is a need for developing a new concept of breakthrough technology that more efficiently captures, stores and utilizes carbon dioxide.

As a prior patent document related to the technical field of the present invention, Patent No. 10-1451630 describes a technique for producing hydrogen by electrochemically reducing carbon dioxide.

Republic of Korea Patent Publication No. 10-1451630 (2014.10.23.)

An object of the present invention is to provide a device for removing carbon dioxide while producing hydrogen from carbon dioxide, which is a greenhouse gas, and a fuel cell system having the same.

Another object of the present invention is to provide a hydrogen generation and carbon dioxide removal device and fuel cell system having the same that can further dissolve the carbon dioxide to continue the hydrogen evolution reaction.

In order to achieve the above object of the present invention, according to an aspect of the present invention, the reaction space, the electrolyte aqueous solution contained in the reaction space and containing a chlorine anion, and at least a portion of the electrolyte solution in the reaction space A hydrogen generator having a reduction electrode and an oxide electrode at least partially submerged in the aqueous electrolyte solution in the reaction space; And a power supply having direct current applied to the hydrogen generator and having a cathode electrically connected to the reduction electrode and an anode electrically connected to the anode, wherein the direct current is applied to the hydrogen generator by the power supply. Carbon dioxide gas is introduced into the aqueous electrolyte solution, and hydrogen ions and bicarbonate ions are generated by the reaction of water in the aqueous electrolyte solution with the carbon dioxide gas. Is generated, and the anode is provided with a hydrogen generating and carbon dioxide removing device and a fuel cell system including the same, in which an electron is separated from the chlorine anion to generate a chlorine gas.

In order to achieve the above object of the present invention, according to another aspect of the present invention, an electrolyte containing a reaction space, a receiving space in communication with the reaction space, and both the reaction space and the receiving space and containing a chlorine anion An aqueous solution, a reduction electrode at least partially submerged in the electrolyte solution in the reaction space, an oxide electrode at least partially submerged in the electrolyte solution in the reaction space, and carbon dioxide gas introduced into the aqueous electrolyte in the accommodation space A hydrogen generator having a carbon dioxide treatment unit for separating carbon dioxide gas from the aqueous electrolyte so as not to be supplied to the reaction space; And a power supply having direct current applied to the hydrogen generator and having a cathode electrically connected to the reduction electrode and an anode electrically connected to the anode, wherein the direct current is applied to the hydrogen generator by the power supply. Carbon dioxide gas is introduced into the aqueous electrolyte solution of the accommodation space, and hydrogen ions and bicarbonate ions are generated by the reaction of water of the aqueous electrolyte solution and the carbon dioxide gas in the reaction space, and the hydrogen electrode and the reduction electrode of the cathode Electrons are combined to generate hydrogen gas, and the anode is provided with a hydrogen generation and carbon dioxide removal device and a fuel cell system including the chlorine generation reaction in which electrons are separated from the chlorine anion to generate chlorine gas.

In order to achieve the above object of the present invention, according to another aspect of the present invention, a reaction space, an aqueous electrolyte solution contained in the reaction space and containing a chlorine anion, a reduction electrode and an anode disposed in the reaction space And a hydrogen generator for generating hydrogen using electricity and carbon dioxide gas supplied from the outside, and in order to maintain the amount of carbon dioxide dissolved in the electrolyte solution above a set value, chlorine generation in the anode Provided is a hydrogen generation and carbon dioxide removal device for generating a reaction to maintain a pH of the electrolyte solution above a set value, and a fuel cell system having the same.

According to the present invention, all the objects of the present invention described above can be achieved. Specifically, by using an aqueous electrolyte containing chlorine ions such as an aqueous sodium chloride solution as the electrolyte solution, the chlorination reaction occurs at the anode, the pH of the electrolyte solution is increased by the chlorination reaction occurring at the anode, accordingly The carbon dioxide gas is further dissolved in the electrolyte solution so that the hydrogen evolution reaction can be continued.

1 is a schematic diagram showing the configuration of a hydrogen generating and carbon dioxide removal apparatus according to an embodiment of the present invention according to an embodiment of the present invention.
Figure 2 is a schematic diagram showing the configuration of a hydrogen generating and carbon dioxide removal apparatus according to another embodiment of the present invention.
3 is a block diagram schematically illustrating a configuration of a fuel cell system according to an exemplary embodiment of the present invention.
4 is a block diagram schematically illustrating a configuration of a fuel cell system according to another exemplary embodiment of the present invention.
5 is a block diagram schematically showing the configuration of a fuel cell system according to another embodiment of the present invention.

Hereinafter, with reference to the drawings will be described in detail the configuration and operation of the embodiment of the present invention.

1 schematically shows a configuration of a hydrogen generation and carbon dioxide removal apparatus according to an embodiment of the present invention. Referring to FIG. 1, the apparatus for generating hydrogen and carbon dioxide 1100 includes a hydrogen generator 1100a and a power supply 1200 for providing direct current electricity to the hydrogen generator 1100a. The hydrogen generation and carbon dioxide removal apparatus 1100 generates hydrogen gas by using carbon dioxide gas as electric raw material, thereby producing hydrogen while removing carbon dioxide, which is a greenhouse gas.

The hydrogen generator 1100a includes at least a reaction vessel 1110 providing a reaction space 1111 therein, an electrolyte solution 1115 contained in the reaction space 1111, and an electrolyte solution 1115 in the reaction space 1111. A cathode 1118, which is partially submerged, and an anode 1158, which is at least partially submerged in the electrolyte solution 1115 in the reaction space 1111 are provided. The hydrogen generator 1100a generates hydrogen gas using carbon dioxide as a raw material using direct current electricity supplied from the power source 1200.

The reaction vessel 1110 provides a reaction space 1111 in which an electrolyte solution 1115 is contained and a cathode 1118 and an anode 1158 are accommodated therein. In the reaction vessel 1110, a first inlet 1112 and a first outlet 1113 are formed in communication with the reaction space 1111. The first inlet 1112 is positioned below the reaction space 1111 to be below the water surface of the electrolyte solution 1115. The first outlet 1113 is positioned above the reaction space 1111 so as to be above the water surface of the aqueous electrolyte 1115. Carbon dioxide gas as a raw material is introduced into the reaction space 1111 through the first inlet 1112, and an electrolyte solution 1115 may also be introduced if necessary. The generated hydrogen gas is discharged through the first discharge port 1113. In the reaction space 111, a carbon dioxide elution reaction occurs.

The electrolyte solution 1115 is contained in the reaction space 1111, and at least a portion of the reduction electrode 1118 and at least a portion of the anode electrode 1158 are immersed in the electrolyte solution 1115. The electrolyte solution 1115 is an aqueous electrolyte containing chlorine ions (Cl ⁻ ), such as seawater or brine, and is described as an aqueous sodium chloride (NaCl) solution in this embodiment. The resulting electrolyte solution 1115 includes sodium cation (Na ⁺ ) and chlorine anion (Cl ⁻ ).

The cathode 1118 is at least partially submerged in the electrolyte solution 1115 in the reaction space 1111. The reduction electrode 1118 is electrically connected to the cathode of the power source 1200 to receive electrons from the power source 1200. The cathode 1118 may be carbon paper, carbon fiber, carbon felt, carbon cloth, metal foam, metal thin film, or a combination thereof, and a platinum catalyst may also be used. In the case of the catalyst, in addition to the platinum catalyst, carbon-based catalysts, carbon-metal-based composite catalysts, perovskite oxide catalysts, and other catalysts that can generally be used as hydrogen evolution catalysts are also included. In the cathode 1118, a hydrogen evolution reaction (HER) occurs by a reduction reaction.

The anode 1158 is at least partially submerged in the aqueous electrolyte 1115 in the reaction space 1111. The anode 1158 is electrically connected to the anode of the power source 1200 to supply electrons to the power source 1200. In the present embodiment, the oxide electrode 1158 may include vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), aluminum (Al), or It is explained that zinc (Zn) is used. In addition, the anode 1158 may be carbon paper, carbon fiber, carbon felt, carbon cloth, metal foam, metal thin film, or a combination thereof, and a platinum catalyst may also be used. In the case of the catalyst, in addition to the platinum catalyst, carbon-based catalysts, carbon-metal-based composite catalysts, perovskite oxide catalysts, and other catalysts which can generally be used as chlorine generation catalysts are also included. In the anode 158, a chlorine evolution reaction (CER) occurs by an oxidation reaction.

Now, a process of generating hydrogen while carbon dioxide is removed from the hydrogen generator 1100a will be described. As illustrated in FIG. 1, carbon dioxide gas is injected into the electrolyte solution 1115, which is an aqueous sodium chloride solution, through the first inlet 1112. In the reaction space 1111, a chemical elution reaction of carbon dioxide, such as the following [Scheme 1], is performed. Is done.

Scheme 1

_{H 2 O (l) + CO} 2 (g) → H + (aq) + HCO 3 - (aq)

That is, the carbon dioxide (CO ₂ ) supplied to the reaction space 1111 is hydrogen cation (H ⁺ ) and bicarbonate (HCO ₃ ⁻ ) through a spontaneous chemical reaction with water (H ₂ O), the solvent of the electrolyte solution 1115. Is generated. The reaction of [Scheme 1] acidifies the electrolyte solution.

In addition, in the cathode 1118, an electrical reaction is performed as shown in [Scheme 2].

Scheme 2

^{2H + (aq) + 2e -} → H 2 (g) (E 0 = 0.00 V vs. SHE)

That is, hydrogen cations (H ⁺ ) around the cathode 1118 receive electrons (e ⁻ ) from the cathode 1118 to generate hydrogen (H ₂ ) gas. The hydrogen evolution reaction occurring at the reduction electrode 1118 makes the electrolyte solution 1115 basic. The generated hydrogen (H ₂ ) gas is discharged to the outside through the first outlet 1113.

In addition, in the vicinity of the reduction electrode 1118, a complex hydrogen generation reaction is performed as shown in [Scheme 3].

Scheme 3

_{2H 2 O (l) + 2CO} 2 (g) + 2e - → H 2 (g) + 2HCO 3 - (aq)

In addition, in the anode 1158, a chlorine generation reaction as shown in [Formula 4] is performed.

Scheme 4

_{^{2Cl - (aq) → Cl 2}} (g) + 2e - (E 0 = 1.25 V vs. SHE)

As a result, the final reaction scheme is the following [Formula 6] which is a chemical reaction electrolysis scheme of the following [Formula 5].

Scheme 5

_{2NaCl (aq) + 2H 2 O} (l) + 2CO 2 (g) → 2NaHCO 3 (aq) + 2H + (aq) + 2Cl - (aq)

Scheme 6

^{2H + (aq) + 2Cl -} (aq) → H 2 (g) + Cl 2 (g)

As can be seen from [Scheme 5] and [Scheme 6], since the hydrogen ions (H ⁺ ) disappear after the electrolytic reaction, the pH of the electrolyte solution 1115 is increased to basicize the first inlet 1112. Incoming carbon dioxide gas can continue to dissolve. The electrolyte solution 1115, which was initially an aqueous sodium chloride (NaCl) solution, gradually changes to an aqueous sodium hydrogen carbonate (NaHCO ₃ ) solution as the reaction proceeds.

In the present embodiment, it was described that an aqueous sodium chloride (NaCl) solution is used as the electrolyte solution 1115, but a solution containing another cation such as an aqueous potassium chloride (KCl) solution or an aqueous calcium chloride (CaCl ₂ ) solution may be used instead of the aqueous sodium chloride solution. If so, other carbonates are produced.

If the electrolyte solution 1115 proceeds using a solution without chlorine ions (Cl ⁻ ), the oxygen generating reaction is performed at the anode 1158 as shown in [Scheme 7].

Scheme 7

^{_{4OH - → O 2 + 2H 2}} O + 4e -

Accordingly, the pH of the electrolyte solution 1115 is not changed so that carbon dioxide is not further dissolved.

Power source 1200 provides direct current electricity to hydrogen generator 1100a. The positive electrode of the power source 1200 is electrically connected to the oxidation electrode 1158 of the hydrogen generator 1100a, and the negative electrode of the power source 1200 is electrically connected to the reduction electrode 1118 of the hydrogen generator 1100a. The power source 1200 may be any type of power source capable of providing direct current electricity, including renewable energy such as solar cells and wind power generation.

2 schematically shows a configuration of a hydrogen generation and carbon dioxide removal apparatus according to another embodiment of the present invention. Referring to FIG. 2, the hydrogen generator 1100b includes a reaction container 1110 providing a reaction space 1111 therein, an electrolyte solution 1115 contained in the reaction space 1111, and an electrolyte in the reaction space 1111. A cathode 1118 at least partially submerged in the solution 1115, an anode 158 at least partially submerged in the electrolyte solution 1115 in the reaction space 1111, a carbon dioxide treatment unit 1120, and a carbon dioxide circulation supply unit ( 1130, and a connection pipe 1140 connecting the reaction space 1111 and the carbon dioxide treatment unit 1120. Since the reaction vessel 1110, the electrolyte solution 1115, the cathode 1118, and the anode 1158 are the same as those described in the embodiment illustrated in FIG. 1, a detailed description thereof will be omitted.

The carbon dioxide processing unit 1120 includes an electrolyte solution 1115 that is the same aqueous solution as the electrolyte solution 1115 contained in the accommodation space 1121 and contained in the reaction space 1111. The carbon dioxide processing unit 1120 includes a second inlet 1122 through which carbon dioxide is introduced into the accommodation space 1121, a communication port 1123 to which the connection pipe 1140 is connected, and an upper portion of the accommodation space 1121. 2 outlet 1124 is formed.

The second inlet 1122 is positioned above the communication port 1123 in the accommodation space 1121, and is located below the water surface of the second outlet 1124 and the aqueous electrolyte 1115. Carbon dioxide gas, which is used as a raw material in the hydrogen generation process, is introduced into the accommodation space 1121 through the second inlet 1122. The aqueous electrolyte 1115 may also be supplied through the second inlet 1122 as needed.

The communication port 1123 is positioned below the second inlet 1122 in the accommodation space 1121, and the connection pipe 1140 is connected to the communication port 1123. The accommodation space 1121 is in communication with the reaction space 1111 through the communication port 1123.

The second outlet 1124 is positioned above the water surface of the second inlet 1122 and the aqueous electrolyte 1115 in the accommodation space 1121. Carbon dioxide gas that has not been ionized because it is not dissolved in the electrolyte solution 1115 in the accommodation space 1121 through the second outlet 1124 is discharged to the outside. The carbon dioxide gas discharged through the second outlet 1124 is supplied to the second inlet 1122 through the carbon dioxide circulation supply unit 1130.

The carbon dioxide circulation supply unit 1130 circulates the carbon dioxide gas discharged through the second discharge port 1124 to the second inlet port 1122 and supplies it again.

The connector 1140 connects the first inlet 1112 of the reaction space 1111 and the communication port 1123 of the accommodation space 1121. The reaction space 1111 and the accommodation space 1121 communicate with each other through a connection passage 1141 formed in the connection pipe 1140.

Carbon dioxide gas which is not ionized because it is not dissolved in the electrolyte solution 1115 of carbon dioxide introduced into the receiving space 1121 of the carbon dioxide processing unit 1120 through the second inlet 1122 is not moved to the reaction space 1111 and rises. The carbon dioxide gas, which is collected in the space above the water surface of the electrolyte solution 1115 in the accommodation space 1121 and is discharged through the second outlet 1124 and discharged through the second outlet 1124, is discharged by the carbon dioxide circulation supply unit 1130. 2 is supplied to the accommodation space 1121 through the inlet 1122 and recycled. In addition, carbon dioxide gas that is not ionized because it is not dissolved in the electrolyte solution 1115 of carbon dioxide introduced into the accommodation space 1121 of the carbon dioxide processing unit 1120 does not move to the reaction space 1111, and thus, the first outlet 1113. Through this, high-purity hydrogen without carbon dioxide can be emitted.

3 is a block diagram showing a schematic configuration of a fuel cell system according to an embodiment of the present invention. Referring to FIG. 3, a fuel cell system 1000 according to an embodiment of the present invention includes a hydrogen generation and carbon dioxide removal device 1100 for generating hydrogen (H ₂ ) while removing carbon dioxide (CO ₂ ), and hydrogen-containing. A reformer 1300 for producing hydrogen-rich reformed gas from fuel and additionally generating carbon dioxide gas, and a fuel cell 1400 for generating electricity by receiving hydrogen as a fuel from the hydrogen generator 1100 and the reformer 1300. ).

Since the hydrogen generating and carbon dioxide removal device 1100 has the configuration shown in FIG. 1 or 2, detailed description thereof will be omitted herein.

The reformer 1300 produces reformed gas rich in hydrogen from the hydrogen containing fuel and additionally generates carbon dioxide gas. The reformed gas produced by the reformer 1300 is supplied to the fuel cell 1400, and the carbon dioxide gas additionally generated by the reformer 1300 is supplied to the hydrogen generators 1100a and 1100b. To this end, in the present embodiment, the reformer 1300 will be described as being a methane-steam reformer that produces hydrogen (H ₂ ) by the reforming reaction of methane (CH ₄ ) and steam (H ₂ O).

 Methane-steam reformers are a significant part of the hydrogen production process because of their low cost and high volume production. The following Reaction Scheme 8 relates to the reforming reaction of the methane-steam reformer 300.

Scheme 8

CH ₄ + H ₂ O-> CO + 3H ₂

CO + H ₂ O-> CO ₂ + H ₂

That is, carbon monoxide (CO) and hydrogen are produced by the chemical reaction of methane and water vapor, and hydrogen can be finally produced by the chemical reaction of carbon monoxide and water vapor.

By the way, the methane-steam reformer 300 has many advantages as described above, but as can be seen in [Scheme 8], it is necessary to supply steam from the outside for the operation of the process, and global warming as a by-product of hydrogen production. There is a problem that carbon dioxide, which is the main cause of environmental problems, must be generated. However, in the case of the present invention, the carbon dioxide generated in the methane-steam reformer is not released into the atmosphere or transferred to a separate carbon dioxide collection and storage process, but instead is transferred to the hydrogen generator 1100a as a raw material for generating hydrogen, thereby improving the methane-steam reformer. The problem of carbon dioxide generation, which is a necessary evil in operation, can be solved. Since the methane-steam reformer is a known technique, a detailed description thereof is omitted here.

The fuel cell 1400 generates water by generating water by a chemical reaction between hydrogen and oxygen. The fuel cell 1400 receives hydrogen generated from the hydrogen generators 1100a and 1100b and hydrogen produced from the reformer 1300 as fuel.

When the power source is a solar cell, during the day when the solar cell operates, the hydrogen generators 1100a and 1100b store hydrogen by using carbon dioxide generated from the reformer as a raw material, and the fuel cell 1400 supplies the hydrogen produced by the reformer. The fuel cell system 1000 so that the hydrogen produced by the hydrogen generator 1100a stored during the day is supplied to the fuel cell 1400 to produce electricity. ), The overall efficiency of the fuel cell system 1000 can be improved.

The fuel cell system 1000 illustrated in FIG. 3 is for the case where the fuel cell 1400 is a polymer electrolyte fuel cell (PEMFC) using hydrogen as a fuel, but the present invention is limited thereto. Alternatively, a solid oxide fuel cell (SOFC) may be used, and an embodiment thereof is illustrated in FIGS. 4 and 5.

Referring to FIG. 4, the fuel cell system 2000 includes hydrogen generators 1100a and 1100b, a power source 1200, a reformer 1300, and an SOFC 2400. Hydrogen, hydrocarbons and carbon monoxide discharged to the reformer 1300 are supplied to SOFC 2400 as fuel, and SOFC 2400 discharges carbon dioxide as a product. Carbon dioxide discharged to the SOFC 2400 is supplied to the hydrogen generators 1100a and 1100b. That is, the hydrogen generators 1100a and 1100b produce hydrogen while receiving and removing carbon dioxide generated from the reformer 1300 and the SOFC 2400, and supply the hydrogen to the fuel of the SOFC 2400. The rest of the configuration is the same as the embodiment shown in Figure 3, so a detailed description thereof will be omitted.

Referring to FIG. 5, the fuel cell system 3000 includes hydrogen generators 1100a and 1100b, a power supply 1200, and an SOFC 2400. The SOFC 2400 receives hydrocarbons as fuel from the outside and discharges carbon dioxide as a product. Carbon dioxide discharged to the SOFC 2400 is supplied to the hydrogen generators 1100a and 1100b. That is, the hydrogen generators 1100a and 1100b produce hydrogen while supplying and removing carbon dioxide generated from the SOFC 2400 and supply the hydrogen to the fuel of the SOFC 2400. The rest of the configuration is the same as the embodiment shown in Figure 4, so a detailed description thereof will be omitted.

Although the present invention has been described through the above embodiments, the present invention is not limited thereto. The above embodiments may be modified or changed without departing from the spirit and scope of the present invention, and those skilled in the art will recognize that such modifications and changes also belong to the present invention.

1000: Fuel Cell System
1100: hydrogen generating and carbon dioxide removal unit
1100a, 1100b: hydrogen generator 1110: reaction vessel
1111: reaction space 1112: first inlet
1113: first outlet 1115: electrolyte solution
1118: cathode 1120: carbon dioxide treatment unit
1121: accommodation space 122: second inlet
1123: communication port 1124: second outlet
1130: carbon dioxide circulation supply unit 1140: connector
1158: anode 1200: power supply
1300: reformer 1400: fuel cell
2400, 3400: solid oxide fuel cell

Claims (21)

delete delete delete delete delete delete delete delete delete delete delete delete delete delete Hydrogen generation and carbon dioxide removal device for generating hydrogen using electric energy as carbon dioxide as a raw material;
A methane-steam reformer which reacts methane with steam to generate hydrogen, carbon monoxide and carbon dioxide; And
Hydrogen generated in the hydrogen generating and carbon dioxide removal device, and a fuel cell receiving hydrogen, carbon monoxide and unreacted methane from the methane-steam reformer as a fuel, and discharges carbon dioxide as a product,
Carbon dioxide generated from the methane-steam reformer and carbon dioxide discharged from the fuel cell are removed by being supplied as raw materials to the hydrogen generation and carbon dioxide removal apparatus,
The hydrogen generation and carbon dioxide removal apparatus includes a reaction space, an electrolyte solution contained in the reaction space and containing a chlorine anion, a reduction electrode and an anode disposed in the reaction space, and electricity supplied from the outside. A methane-steam reformer and a hydrogen generator for generating hydrogen gas using carbon dioxide gas supplied from the fuel cell;
In order to maintain the amount of carbon dioxide dissolved in the electrolyte solution above a set value, electrons are separated from the chlorine anion at the anode to generate a chlorine generation reaction in which chlorine gas is generated, thereby maintaining the pH of the electrolyte solution above the set value. And
As the chlorine generation reaction proceeds, the electrolyte solution in the entire reaction space is changed to a sodium hydrogen carbonate solution as the pH is increased and basicized, and the hydrogen gas and the chlorine gas are generated and discharged together. delete delete The method according to claim 15,
The fuel cell is a solid oxide fuel cell (SOFC) fuel cell system. delete delete delete

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