JP7176025B2 - generator - Google Patents

Description

The present invention relates to power generators.

Biomass power generation is one of the promising options for carbon-neutral green power generation. For example, Patent Literature 1 discloses a biomass power generation device that includes a boiler that burns biomass fuel to generate steam, a turbine that is driven by the steam, and a generator that converts the rotational energy of the turbine into electrical energy. ing.

Japanese Patent No. 6718565

However, in the conventional power generator such as Patent Document 1, although biomass fuel is used for power generation, carbon dioxide is emitted as the fuel is burned. Therefore, if it is possible to suppress the emission of carbon dioxide, which is emitted during power generation, into the atmosphere and convert it into a valuable resource, it can be said that the value as a power generation device will be further increased not only from the environmental point of view but also from the economic point of view. Energy is also required to convert the carbon dioxide in the combustion exhaust gas. Therefore, it is important to be able to achieve both power generation and carbon dioxide conversion with high energy efficiency without using the power obtained from fuel combustion.

An object of the present invention is to provide a power generator capable of both generating power by burning fuel and converting carbon dioxide generated by combustion with high energy efficiency.

The present invention employs the following aspects.
(1) A power generation device according to an aspect of the present invention (for example, the power generation device 100 of the embodiment) is a combustion power generation device (for example, the combustion power generation device of the embodiment) that generates power using the heat of burning fuel. 1), an electrochemical reactor that electrochemically reduces carbon dioxide (for example, the electrochemical reactor 2 of the embodiment), and a power storage device that supplies power to the electrochemical reactor (for example, the and a power storage device 3), wherein the combustion type power generation device includes a combustor (for example, the combustor 11 of the embodiment) that burns fuel, and the carbon dioxide generated by the combustion of the combustor is the electrochemical Oxygen supplied to the reactor and by-produced in the carbon dioxide reduction of the electrochemical reactor is supplied to the combustor, and the power storage device is a conversion unit that converts renewable energy into electrical energy (e.g., and a storage unit (for example, the storage unit 32 of the embodiment) that stores the electrical energy converted by the conversion unit.

(2) The combustor may be a biomass combustor that burns biomass fuel.

(3) The combustion power generation device is driven by the combustor, a vaporizer (for example, the vaporizer 12 of the embodiment) that vaporizes water by heat generated by the combustor, and steam generated by the vaporizer. and a condenser (for example, the condenser 14 of the embodiment) that converts the steam discharged from the steam turbine back to water (for example, the condenser 14 of the embodiment). .

(4) Part of the condensate generated in the condenser may be added to the electrolyte used in the electrochemical reaction device.

(5) A power generating apparatus according to an aspect of the present invention is a carbon-increasing reactor (for example, the carbon-increasing reactor 4 of the embodiment) that increases the amount of ethylene produced by the carbon dioxide reduction in the electrochemical reactor to increase carbon. may further include

(6) The power generation device according to one aspect of the present invention may further include an ethanol refiner (for example, the ethanol refiner 6 of the embodiment) that refines the ethanol produced by the carbon dioxide reduction in the electrochemical reaction device. good.

According to the aspects (1) to (6), it is possible to provide a power generator capable of both power generation by fuel combustion and conversion of carbon dioxide generated by combustion with high energy efficiency.

It is a block diagram which shows the electric power generating apparatus which concerns on an embodiment. 1 is a schematic cross-sectional view showing an example of an electrolytic cell of an electrochemical reactor; FIG. It is a block diagram which shows the electric power generating apparatus which concerns on other embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the dimensions and the like of the drawings illustrated in the following description are only examples, and the present invention is not necessarily limited to them, and can be implemented with appropriate changes within the scope of not changing the gist of the present invention. .

[Power generator]
As shown in FIG. 1, a power generation device 100 according to one aspect of the present invention includes a combustion power generation device 1, an electrochemical reaction device 2, a power storage device 3, and a carbon enrichment reaction device 4. . The combustion power generator 1 includes a combustor 11 , a vaporizer 12 , a steam turbine 13 and a condenser 14 . The power storage device 3 includes a conversion section 31 and a storage section 32 electrically connected to the conversion section 31 . The coal-enhancing reactor 4 includes a reactor 41 and a gas-liquid separator 42 .

In the power generation device 100 , the combustor 11 and the electrochemical reaction device 2 are connected by the gas flow path 71 . The carburetor 12 and the steam turbine 13 are connected by a circulation passage 72 . The steam turbine 13 and condenser 14 are connected by a circulation flow path 73 . The condenser 14 and the evaporator 12 are connected by a circulation flow path 74 . In the electrochemical reaction device 2 , the inlet and outlet of the electrolytic solution in the electrochemical reaction device 2 are connected by a circulation flow path 75 provided outside the electrochemical reaction device 2 . A heat exchanger 5 is provided in the middle of the circulation flow path 75 . The condenser 14 and the circulation flow path 75 are connected by a liquid flow path 76 . The electrochemical reaction device 2 and the combustor 11 are connected by a gas flow path 77 . The electrochemical reactor 2 and reactor 41 are connected by a gas flow path 78 . The reactor 41 and the gas-liquid separator 42 are connected by gas channels 79 and 80 .

These flow paths are not particularly limited, and known pipes and the like can be used as appropriate. In the gas flow paths 71, 77 to 79, 80 and the circulation flow paths 72, 73, air supply means such as compressors, pressure reducing valves, measuring devices such as pressure gauges, etc. can be appropriately installed. Further, in the circulation flow paths 72 and 75 and the liquid flow path 76, liquid feeding means such as pumps, measuring instruments such as flowmeters, and the like can be appropriately installed.

The combustion power generation device 1 is a device that generates power using the heat of burning fuel. The mode of the combustion power generation device 1 is not particularly limited, and may be a biomass power generation device using biomass as a fuel, or a thermal power generation device using a fossil fuel such as liquefied natural gas, coal, or petroleum as a fuel. good. Among them, a biomass power generation device is preferable because it can realize carbon-neutral green power generation.

The mode of the biomass power generation device is not particularly limited. For example, a direct combustion method in which steam obtained by burning fuel is used to drive a steam turbine to generate power, a gas obtained by heat-treating fuel is converted into gas. Either a pyrolysis gasification method in which gas is burned in a turbine to generate power, or a biochemical gasification method in which a gas biochemically generated from fuel is burned in a gas turbine to generate power may be adopted.

In the combustion power generator 1 of this example, the fuel is burned in the combustor 11, and the water W is vaporized in the vaporizer 12 using the generated heat to become steam W1. The steam W1 generated by the evaporator 12 is sent to the steam turbine 13 through the circulation passage 72, and the steam turbine 13 is driven to generate power by a generator (not shown). The steam W1 discharged from the steam turbine 13 is sent to the condenser 14 through the circulation passage 73 and condensed into condensate W2. The condensate W2 generated in the condenser 14 is sent to the vaporizer 12 through the circulation passage 74 and circulated. Further, the exhaust gas G containing carbon dioxide generated by burning the fuel in the combustor 11 is supplied to the electrochemical reaction device 2 through the gas flow path 71 .

The modes of the combustor 11, the vaporizer 12, the steam turbine 13, and the condenser 14 are not particularly limited, and known modes can be employed without restriction. As the combustor 11, a biomass combustor that burns biomass fuel is preferable.

The electrochemical reaction device 2 is a device for electrochemically reducing carbon dioxide. As shown in FIG. 2, the electrochemical reaction device 2 includes a cathode 21, an anode 22, a liquid channel structure 23 forming a liquid channel 23a, and a gas channel structure 24 forming a gas channel 24a. , a gas channel structure 25 forming a gas channel 25 a , a power feeder 26 , and a power feeder 27 .

In the electrochemical reaction device 2, a power feeder 26, a gas channel structure 24, a cathode 21, a liquid channel structure 23, an anode 22, a gas channel structure 25, and a power feeder 27 are stacked in this order. A slit is formed in the liquid channel structure 23, and a portion of the slit surrounded by the cathode 21 and the anode 22 serves as a liquid channel 23a. A groove is formed on the cathode 21 side of the gas channel structure 24, and a portion of the groove surrounded by the gas channel structure 24 and the cathode 21 serves as a gas channel 24a. A groove is formed on the anode 22 side of the gas channel structure 25, and a portion of the groove surrounded by the gas channel structure 25 and the anode 22 serves as a gas channel 25a.

Thus, in the electrochemical reaction device 2, the liquid channel 23a is formed between the cathode 21 and the anode 22, the gas channel 24a is formed on the opposite side of the cathode 21 from the anode 22, and the cathode 21 of the anode 22 is formed. A gas flow path 25a is formed on the opposite side. The feeders 26 and 27 are electrically connected to the reservoir 32 of the power storage device 3 . Moreover, the gas channel structure 24 and the gas channel structure 25 are conductors, so that a voltage can be applied between the cathode 21 and the anode 22 by electric power supplied from the storage section 32 .

The cathode 21 is an electrode that reduces carbon dioxide and water. The cathode 21 may be any material as long as it can electrochemically reduce carbon dioxide and allows the generated gaseous product to permeate to the gas flow path 24a. A layered electrode can be exemplified. The cathode catalyst layer may partially enter the gas diffusion layer. A porous layer denser than the gas diffusion layer may be arranged between the gas diffusion layer and the cathode catalyst layer.

A known catalyst that promotes reduction of carbon dioxide can be used as the cathode catalyst that forms the cathode catalyst layer. Specific examples of cathode catalysts include metals such as gold, silver, copper, platinum, palladium, nickel, cobalt, iron, manganese, titanium, cadmium, zinc, indium, gallium, lead, tin, and alloys and intermetallic compounds thereof. , ruthenium complexes, and rhenium complexes. Among these, copper and silver are preferable, and copper is more preferable, because the reduction of carbon dioxide is promoted. As the cathode catalyst, one type may be used alone, or two or more types may be used in combination.
As the cathode catalyst, a supported catalyst in which metal particles are supported on a carbon material (carbon particles, carbon nanotubes, graphene, etc.) may be used.

The gas diffusion layer of the cathode 21 is not particularly limited, and examples thereof include carbon paper and carbon cloth.
The method of manufacturing the cathode 21 is not particularly limited, and for example, a method of applying a liquid composition containing a cathode catalyst to the surface of the gas diffusion layer on the side of the liquid flow path 23a and drying it can be exemplified.

Anode 22 is an electrode for oxidizing hydroxide ions to produce oxygen. As the anode 22, any material can be used as long as it can electrochemically oxidize hydroxide ions and allows the generated oxygen to permeate to the gas flow path 25a. can be exemplified.

The anode catalyst forming the anode catalyst layer is not particularly limited, and known anode catalysts can be used. Specifically, for example, metals such as platinum, palladium, and nickel, alloys and intermetallic compounds thereof, manganese oxide, iridium oxide, nickel oxide, cobalt oxide, iron oxide, tin oxide, indium oxide, ruthenium oxide, and lithium oxide. , metal oxides such as lanthanum oxide, and metal complexes such as ruthenium complexes and rhenium complexes. As the anode catalyst, one type may be used alone, or two or more types may be used in combination.

Examples of the gas diffusion layer of the anode 22 include carbon paper and carbon cloth. As the gas diffusion layer, a porous material such as a mesh material, a punching material, a porous material, or a metal fiber sintered material may be used. Examples of the material of the porous body include metals such as titanium, nickel and iron, and alloys thereof (for example, SUS).

Examples of the material of the liquid flow path structure 23 include fluororesins such as polytetrafluoroethylene.
Examples of materials for the gas channel structures 24 and 25 include titanium, metals such as SUS, and carbon.
Examples of materials for the power feeders 26 and 27 include metals such as copper, gold, titanium, SUS, and carbon. As the power feeders 26 and 27, a copper base material having a surface plated with gold or the like may be used.

In the electrochemical reaction device 2, the electrolytic solution A is caused to flow through the liquid flow path 23a. The electrolytic solution A flowing out from the outlet of the liquid channel 23a is returned to the inlet of the liquid channel 23a through the circulation channel 75 and circulated.
The electrolytic solution A is not particularly limited, and examples thereof include an aqueous potassium hydroxide solution and an aqueous sodium hydroxide solution. Among them, an aqueous potassium hydroxide solution is preferable because it promotes the reduction of carbon dioxide.

The exhaust gas G containing carbon dioxide supplied from the combustor 11 is flowed through the gas flow path 24a. By applying a voltage to the cathode 21 and the anode 22, carbon dioxide is electrochemically reduced by the following reaction at the cathode 21 to produce carbon monoxide and ethylene. In addition, hydrogen is produced from water by the following reaction. A gaseous product C containing ethylene and hydrogen produced at the cathode 21 permeates the gas diffusion layer of the cathode 21 , flows out from the gas channel 24 a and is sent to the reactor 41 through the gas channel 78 .
CO ₂ +H ₂ O→CO+2OH ⁻
2CO+8H2O→ _{C2H4 + 8OH- +} ^2H2O
2H ₂ O→H ₂ +2OH ⁻

Also, the hydroxide ions generated at the cathode 21 move through the electrolyte A to the anode 22 and are oxidized by the following reaction to generate oxygen. Oxygen gas B generated at the anode 22 permeates the gas diffusion layer of the anode 22 and flows out from the gas channel 25a.
4OH ⁻ →O ₂ +2H ₂ O

When the atmosphere is used for combustion of the fuel in the combustor 11, most of the composition of the atmosphere is nitrogen, so the concentration of carbon dioxide in the exhaust gas G is low. Therefore, in order to efficiently reduce carbon dioxide in the electrochemical reactor 2, the carbon dioxide in the exhaust gas G must be concentrated. On the other hand, in the power generation device 100, the oxygen by-produced by the carbon dioxide reduction in the electrochemical reaction device 2 is supplied to the combustor 11 through the gas passage 77 and used for fuel combustion. If high-purity oxygen that is by-produced in the electrochemical reaction device 2 is used for combustion in the combustor 11, the concentration of carbon dioxide in the exhaust gas G will be higher than in the case of using the air. As a result, carbon dioxide can be efficiently reduced in the electrochemical reaction device 2 without concentrating carbon dioxide, and the energy required for concentrating carbon dioxide can be reduced.

Moreover, when biomass fuel is used in the combustor 11, the biomass fuel is an oxygen-containing raw material, so oxygen in the raw material can also be used for combustion. Therefore, when biomass fuel is used, a sufficient amount of oxygen required for complete combustion can be secured only by oxygen supplied from the electrochemical reaction device 2 without using the atmosphere, so carbon dioxide in the exhaust gas G Concentrations can be further increased.

In the power generator 100 , exhaust heat from the steam turbine 13 of the combustion power generator 1 can be used to heat the electrolyte A flowing through the circulation flow path 75 through heat exchange in the heat exchanger 5 . As a result, the temperature of the electrolytic solution A supplied to the electrochemical reaction device 2 increases, thereby improving the oxidation-reduction reaction rate in the electrochemical reaction device 2 and further increasing the energy efficiency.

In addition, in the electrochemical reaction device 2, water electrolysis accompanies carbon dioxide electrolysis as described above, so water content in the electrolytic solution A decreases as carbon dioxide is reduced. In the power generation device 100, part of the condensate W2 generated in the condenser 14 of the combustion type power generation device 1 is added through the liquid flow path 76 to the electrolytic solution A flowing through the circulation flow path 75, and is reduced by water decomposition. Water in the electrolyte solution A is replenished. As the water content of the electrolyte solution A used in the electrochemical reaction device 2, high-purity water such as purified water is required. Therefore, when tap water is used, it is often purified with a filter, and purification requires energy. On the other hand, the condensate W2 obtained by condensing the steam W1 that drives the steam turbine 13 is distilled water, which has a higher purity than tap water and can be used as the electrolytic solution A as it is. Therefore, the mode in which part of the condensate W2 is replenished as the water content of the electrolytic solution A can reduce the energy required to produce purified water from tap water, thereby further increasing the energy efficiency.

The power storage device 3 is a device that supplies power to the electrochemical reaction device 2 .
The conversion unit 31 converts the renewable energy into electrical energy. The conversion unit 31 is not particularly limited, and examples thereof include a wind power generator, a solar power generator, and a geothermal power generator. The number of conversion units 31 included in the power storage device 3 may be one, or two or more.

The storage unit 32 stores the electrical energy converted by the conversion unit 31 . By storing the converted electrical energy in the storage unit 32, electric power can be stably supplied to the electrochemical reaction device 2 even when the conversion unit is not generating electricity. Also, when renewable energy is used, generally voltage fluctuations tend to be large, but by temporarily storing it in the storage unit 32, it is possible to supply power to the electrochemical reaction device 2 at a stable voltage.

The storage unit 32 may be any one that can be charged and discharged, and examples thereof include a nickel-metal hydride battery and a lithium-ion secondary battery. Among them, the nickel-metal hydride battery is preferable because it has the possibility of sharing and sharing the electrolytic solution by using potassium hydroxide as the electrolyte.

The original purpose of power generation by the combustion type power generator 1 is to meet the demand for power and supply it to the market. Therefore, by combining the power storage device 3 and supplying power from the power storage device 3 to the electrochemical reaction device 2, the combustion power generation device 1 can fully perform its original role. In particular, when the distance between the conversion unit 31 and the storage unit 32 and the distance between the power storage device 3 and the electrochemical reaction device 2 are shortened, the power transmission loss can be reduced. Direct current can be used in the device 2 as it is.

Further, for example, when the conversion unit 31 of the power storage device 3 is a solar power generator, power cannot be generated at night, but the power demand in the market also decreases during the night. Carbon dioxide reduction may be performed in the electrochemical reactor 2 using electric power. In this way, when using solar energy, the power storage device 3 assists the reduction of carbon dioxide during the daytime when the power demand in the market is high, and the surplus power generated by the combustion power generation device 1 at nighttime when the power demand is low. It is preferable to use the carbon dioxide reduction method. Not stopping the operation of the combustion power generator 1 is also reasonable from the viewpoint of power generation loss in the combustion power generator 1 .

The coal-increasing reactor 4 is a device for increasing the amount of ethylene produced by the reduction of carbon dioxide in the electrochemical reactor 2 to increase coal.
A gaseous product C containing ethylene produced by reduction in the electrochemical reactor 2 is sent to the reactor 41 through the gas passage 78 . In the reactor 41, an ethylene polymerization reaction is carried out in the presence of an olefin polymerization catalyst. This makes it possible to produce carbon-rich olefins such as 1-butene, 1-hexene, 1-octene, and the like.

The olefin multimerization catalyst is not particularly limited, and known catalysts used for multimerization reactions can be used. Examples thereof include solid acid catalysts using silica alumina or zeolite as a carrier, and transition metal complex compounds.

In the carbon enrichment reactor 4 of this example, the product gas D after the multimerization reaction that flows out from the reactor 41 is sent to the gas-liquid separator 42 through the gas flow path 79 . Olefins having 6 or more carbon atoms are liquid at room temperature. Therefore, for example, when an olefin having 6 or more carbon atoms is used as a target carbon compound, by setting the temperature of the gas-liquid separator 42 to about 30 ° C., the olefin having 6 or more carbon atoms (olefin liquid E1) and less than 6 carbon atoms olefin (olefin gas E2) can be easily separated from gas and liquid. Moreover, the carbon number of the olefin liquid E1 obtained can be enlarged by raising the temperature of the gas-liquid separator 42. FIG.

For example, using a gas-liquid separator 42 equipped with a cooling pipe, the atmosphere is passed through the cooling pipe and the product gas D is passed outside the cooling pipe, and is condensed on the surface of the cooling pipe to obtain the olefin liquid E1. In addition, the olefin gas E2 separated by the gas-liquid separator 42 contains unreacted components such as ethylene and olefins having fewer carbon atoms than the target olefin, so it is returned to the reactor 41 through the gas flow path 80. It can be reused for multimerization reactions.

The ethylene multimerization reaction in the reactor 41 is an exothermic reaction in which the feed material has a higher enthalpy than the product material and the reaction enthalpy is negative. Therefore, by utilizing the reaction heat generated in the reactor 41 to heat the electrolytic solution A in the heat exchanger 5, the energy efficiency can be further improved.

The carbon enrichment reactor 4 utilizes the hydrogen generated in the electrochemical reactor 2 to carry out a hydrogenation reaction of olefins obtained by enriching ethylene and an isomerization reaction of olefins and paraffins. may be provided.

A power generation method using the power generation device 100 will be described below.
First, fuel is burned in the combustor 11, and the heat is used to evaporate the water W in the evaporator 12 into steam W1. The steam W1 drives the steam turbine 13 to generate electricity. The steam W1 discharged from the steam turbine 13 is turned into condensate W2 in the condenser 14 and returned to the vaporizer 12 for circulation.

An exhaust gas G containing carbon dioxide discharged from the combustor 11 is supplied to the gas flow path 24 a of the electrochemical reaction device 2 . Electric power is supplied from the power storage device 3 to the electrochemical reaction device 2 to apply a voltage between the cathode 21 and the anode 22, and the cathode 21 electrochemically reduces carbon dioxide to produce ethylene, Water is reduced to produce a gaseous product C containing hydrogen. By heating the electrolytic solution A in the heat exchanger 5 using the waste heat from the steam turbine 13 and the reaction heat of the reactor 41, the reaction efficiency of the electrochemical reaction device 2 can be increased. The temperature of the electrolytic solution A supplied to the electrochemical reaction device 2 can be appropriately set, and can be set to 65 to 105° C., for example.

At the anode 22, hydroxide ions in the electrolyte A are oxidized to generate oxygen. The oxygen gas B generated at the anode 22 is supplied to the combustor 11 and used for fuel combustion. By using high-purity oxygen that is by-produced in the electrochemical reaction device 2 for combustion in the combustor 11, the concentration of carbon dioxide in the exhaust gas G supplied to the electrochemical reaction device 2 increases. Therefore, the energy required for concentrating carbon dioxide can be reduced, resulting in high energy efficiency.
The water content of the electrolyte A that decreases due to the reaction in the electrochemical reaction device 2 is replenished by adding part of the condensate W2 generated in the condenser 14 to the electrolyte A while supplying the water W to the vaporizer 12. do.

A gaseous product C containing ethylene produced by reducing carbon dioxide in the electrochemical reactor 2 is sent to the reactor 41, where it is brought into gas phase contact with an olefin enrichment catalyst to enrich ethylene. This gives an ethylene-enriched olefin. For example, when an olefin having 6 or more carbon atoms is used as the target carbon compound, the product gas D from the reactor 41 is sent to the gas-liquid separator 42 and cooled to about 30°C. Then, the target olefin having 6 or more carbon atoms (for example, 1-hexene) is liquefied, and the olefin having less than 6 carbon atoms remains as gas, so that it can be easily produced as olefin liquid E1 (target carbon compound) and olefin gas E2. Separable. The number of carbon atoms in the olefin liquid E1 and the olefin gas E2 to be gas-liquid separated can be adjusted by the temperature of the gas-liquid separation.

The olefin gas E2 after the gas-liquid separation can be returned to the reactor 41 and reused for the multi-layering reaction. Thus, when circulating an olefin having fewer carbon atoms than the target olefin between the reactor 41 and the gas-liquid separator 42, the reactor 41 feed gas (a mixture of the gaseous product C and the olefin gas E2 It is preferable to adjust the contact time between the gas) and the catalyst so that each olefin molecule undergoes a multi-layering reaction once on average. This prevents the olefin produced in the reactor 41 from unintentionally increasing in carbon number, so that the gas-liquid separator 42 can selectively separate the olefin having the desired carbon number (olefin liquid E1).

According to such a method, a valuable substance can be efficiently obtained from a renewable carbon source with high selectivity. Therefore, it does not require large-scale refining equipment such as a distillation column, which is required in conventional petrochemicals using the Fischer-Tropsch (FT) synthesis method or the MtG method, and is economically superior overall.

As described above, the power generation device 100 combines the combustion type power generation device 1 that generates power using the heat of burning fuel and the electrochemical reaction device 2 that electrochemically reduces carbon dioxide. The carbon dioxide generated by the power generator 1 and the oxygen generated by the electrochemical reactor 2 are mutually utilized. In the power generation device 100, the carbon dioxide concentration in the exhaust gas discharged from the combustor 11 is higher than in the case of using only the air as the oxygen source for fuel combustion, and the energy required for carbon dioxide concentration can be reduced. Furthermore, by combining the power storage device 3, the power generated by the combustion type power generation device 1 does not need to be used for carbon dioxide reduction in the electrochemical reaction device 2, so the combustion type power generation device 1 is said to meet the power demand. adequately fulfill its intended role. Thus, power generation and carbon dioxide conversion can be performed with high energy efficiency.

Moreover, if biomass power generation is performed in the combustion type power generation device 1, the carbon dioxide concentration in the exhaust gas discharged from the combustor 11 will be further increased, so that the energy efficiency will be further increased. In power generation using the power generation device 100, ethylene can be increased to produce olefins and paraffins that can be used as synthetic fuels.

In addition, the power generator of the present invention is not limited to the power generator 100 described above.
For example, the power generator of the present invention may include an ethanol refiner that refines ethanol produced by reducing carbon dioxide in the electrochemical reactor. Specifically, for example, the power generator 200 illustrated in FIG. 3 may be used. The same parts in FIG. 3 as those in FIG.

The power plant 200 includes an ethanol refining device 6 instead of the carbon enrichment reactor 4 in the power plant 100 .
The ethanol refiner 6 includes a distillation column 61 and a gas-liquid separator 62 . The distillation column 61 is connected by a liquid channel 81 to the outlet of the liquid channel 23 a of the electrochemical reactor 2 . The distillation column 61 and the gas-liquid separator 62 are connected by a gas flow path 84 . The distillation column 61 and the heat exchanger 5 are connected by a liquid flow path 82 . The heat exchanger 5 and the electrochemical reactor 2 are connected by a liquid flow path 83 .

In the power generation device 200, ethanol produced by reducing carbon dioxide at the cathode 21 is obtained as a mixed solution H with the electrolytic solution A, so the mixed solution H is sent to the distillation column 61 through the liquid flow path 81 and distilled. be. The ethanol gas I separated by distillation is sent to the gas-liquid separator 62 through the gas flow path 84 and recovered as liquid ethanol J. The electrolytic solution A from which ethanol has been separated in the distillation column 61 is sent through the liquid flow path 82 to the heat exchanger 5 to be heated, and returned through the liquid flow path 82 to the electrochemical reactor 2 for circulation.

In the power generation method using the power generation device 200, as in the method using the power generation device 100, carbon dioxide generated in the combustion type power generation device 1 is supplied to the electrochemical reaction device 2 and electrochemically reduced. Ethanol produced by reducing carbon dioxide in the electrochemical reaction device 2 is purified in the ethanol refining device 6 to obtain ethanol. In this way, power generation using the power generation device 200 can also produce ethanol.

In the power generator according to one aspect of the present invention, the combustion power generator 1 may be a thermal power generator. Further, the power generation device according to one aspect of the present invention may be a power generation device that does not include the coal-increase reactor, the heat exchanger, and the ethanol refiner. Ethylene can also be produced in power generation using this power generation device.
In addition, it is possible to appropriately replace the constituent elements in the above-described embodiment with well-known constituent elements without departing from the spirit of the present invention, and the modifications described above may be combined as appropriate.

DESCRIPTION OF SYMBOLS 100,200... Power generation apparatus 1... Combustion-type power generation apparatus 2... Electrochemical reaction apparatus 3... Power supply storage apparatus 4... Carbonization reaction apparatus 5... Heat exchanger 6... Ethanol refining apparatus 11... Combustor , 12... Vaporizer, 13... Steam turbine, 14... Condenser, 21... Cathode, 22... Anode, 23a... Liquid flow path, 31... Converting part, 32... Storage part, 41... Reactor, 42... Gas-liquid Separator 61 Distillation column 62 Gas-liquid separator A Electrolyte.

Claims (4)

A combustion-type power generation device that generates electricity using heat from burning fuel, an electrochemical reaction device that electrochemically reduces carbon dioxide, and a power storage device that supplies power to the electrochemical reaction device. ,
The combustion power generation device includes a combustor that burns fuel,
Carbon dioxide generated by combustion in the combustor is supplied to the electrochemical reaction device,
oxygen by-produced in carbon dioxide reduction in the electrochemical reaction device is supplied to the combustor;
The combustion-type power generation device includes the combustor, a vaporizer that vaporizes water by heat generated by the combustor, a steam turbine driven by the steam generated by the vaporizer, and exhaust gas discharged from the steam turbine. a condenser for converting the steam back to water;
A power generator , wherein part of the condensate produced in the condenser is added to the electrolyte used in the electrochemical reactor . The power generator according to claim 1, wherein the combustor is a biomass combustor that burns biomass fuel. 3. The power generator according to claim 1, further comprising a carbon-rich reactor that increases the amount of ethylene produced by the carbon dioxide reduction in the electrochemical reactor to increase carbon. The power generation device according to any one of claims 1 to 3 , further comprising an ethanol purifier that purifies ethanol produced by carbon dioxide reduction in the electrochemical reactor.

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