CN211238400U - Fuel cell system for purifying and reforming biogas to produce hydrogen - Google Patents
Fuel cell system for purifying and reforming biogas to produce hydrogen Download PDFInfo
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- CN211238400U CN211238400U CN201921974596.XU CN201921974596U CN211238400U CN 211238400 U CN211238400 U CN 211238400U CN 201921974596 U CN201921974596 U CN 201921974596U CN 211238400 U CN211238400 U CN 211238400U
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- reforming
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- methane
- biogas
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- 238000002407 reforming Methods 0.000 title claims abstract description 111
- 239000000446 fuel Substances 0.000 title claims abstract description 89
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 30
- 239000001257 hydrogen Substances 0.000 title claims abstract description 30
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 24
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 184
- 239000007789 gas Substances 0.000 claims abstract description 63
- 238000000746 purification Methods 0.000 claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 150000002431 hydrogen Chemical class 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 238000005406 washing Methods 0.000 claims description 12
- 239000007787 solid Substances 0.000 claims description 9
- 230000015572 biosynthetic process Effects 0.000 claims description 8
- 238000003786 synthesis reaction Methods 0.000 claims description 8
- 239000000498 cooling water Substances 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 abstract description 9
- 230000001105 regulatory effect Effects 0.000 description 15
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 9
- 239000003546 flue gas Substances 0.000 description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000006057 reforming reaction Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000000112 cooling gas Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 239000012495 reaction gas Substances 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 235000017550 sodium carbonate Nutrition 0.000 description 1
- 238000001991 steam methane reforming Methods 0.000 description 1
- 238000000629 steam reforming Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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- Fuel Cell (AREA)
- Hydrogen, Water And Hydrids (AREA)
Abstract
The utility model discloses a fuel cell system for hydrogen production by purifying and reforming marsh gas, which comprises a marsh gas source, a marsh gas purifying component connected with the marsh gas source, a reforming unit connected with the marsh gas purifying component and a fuel cell; the gas inlet end of the biogas purification component is connected with the gas outlet end of the biogas source; the reforming unit comprises a methane preheater and a reforming reactor for reforming methane and steam to produce hydrogen, a preheated methane inlet of the methane preheater is connected with an air outlet end of the methane purification assembly, a reformed gas inlet end of the reforming reactor is connected with a preheated methane outlet of the methane preheater, a reformed gas outlet end of the reforming reactor is connected with a fuel cell for supplying fuel, and a steam outlet of the reforming reactor is connected with a reformed gas inlet end of the reforming reactor through a flow regulator and is mixed with methane for reforming. The fuel cell is utilized to generate the power by reforming the methane to obtain the fuel, so that the conversion rate and the reaction rate of the methane can be effectively improved.
Description
Technical Field
The utility model belongs to the chemical industry field relates to marsh gas reforming hydrogen manufacturing system, especially relates to a marsh gas purifies reforming hydrogen manufacturing fuel cell system.
Background
The Solid Oxide Fuel Cell (SOFC) belongs to the third generation fuel cell, and is an all-solid-state chemical power generation device which can directly convert chemical energy stored in fuel and oxidant into electric energy at medium and high temperature with high efficiency and environmental friendliness. Is generally recognized as a fuel cell that will be widely used in the future as a Proton Exchange Membrane Fuel Cell (PEMFC).
The Chinese utility model patent application No. 201821771394.0 discloses a solid oxide fuel cell system based on marsh gas, which comprises a fuel cell, a marsh gas component, a flue gas component, a water component and an air component, wherein the marsh gas component comprises a marsh gas source, a marsh gas heat exchanger and a marsh gas reformer which are connected in sequence, and a discharge port of the marsh gas reformer is connected with the anode of the fuel cell; the air assembly comprises an air source and an air heat exchanger which are connected in sequence; the discharge port of the air heat exchanger is connected with the cathode of the fuel cell; the water component comprises a flue gas condenser and a water heat exchanger which are connected in sequence; the discharge hole of the water heat exchanger is connected with the feed inlet of the methane reformer; the flue gas assembly comprises a burner; the fuel cell, the biogas source and the air source are all connected with a feed inlet of the burner, and a discharge outlet of the burner is respectively connected with the biogas reformer, the biogas heat exchanger, the air heat exchanger, the water heat exchanger and the flue gas condenser.
In the above technical solution, the fuel source of the solid oxide fuel cell is provided by using the biogas, and the water in the flue gas and the exhaust gas of the fuel cell are collected and utilized to save resources, but the system layout is still unreasonable, for example, the outlet of the reformed flue gas flow channel is used for heat exchange of the biogas preheating flow channel, then water preheating is performed, and then the preheated water is circulated as the reforming reaction flow, so that the inlet temperature of the reforming reactor is low, thereby affecting the conversion efficiency of the methane and the utilization rate of the energy.
Disclosure of Invention
The utility model aims to provide a fuel cell system for hydrogen production by methane purification and reforming aiming at the problems; the technical problem of unreasonable layout in the prior art is solved.
In order to achieve the above purpose, the utility model adopts the following technical proposal:
the utility model creatively provides a fuel cell system for hydrogen production by purifying and reforming marsh gas, which comprises a marsh gas source, a marsh gas purifying component connected with the marsh gas source, a reforming unit connected with the marsh gas purifying component and a fuel cell;
the gas inlet end of the biogas purification component is connected with the gas outlet end of the biogas source;
the reforming unit comprises a methane preheater and a reforming reactor for reforming methane and steam to produce hydrogen, a preheated methane inlet of the methane preheater is connected with an air outlet end of the methane purification assembly, a reformed gas inlet end of the reforming reactor is connected with a preheated methane outlet of the methane preheater, a reformed gas outlet end of the reforming reactor is connected with a fuel cell for supplying fuel, and a steam outlet of the reforming reactor is connected with a reformed gas inlet end of the reforming reactor through a flow regulator and is mixed with methane for reforming.
In the fuel cell system for hydrogen production by biogas purification and reforming, the biogas purification component comprises a biogas filter, an alkali washing tank and a water washing tank which are sequentially connected and used for removing solid impurities and moisture in biogas.
In the above fuel cell system for hydrogen production by purifying and reforming biogas, the biogas purification assembly is connected to the gas-liquid inlet of the first gas-liquid separator, and the gas-phase outlet of the first gas-liquid separator is connected to the preheated methane inlet of the methane preheater of the reforming unit.
In the above fuel cell system for producing hydrogen by purifying and reforming biogas, the reforming unit further comprises a moderate-pressure reactor, a reformed gas outlet end of the reforming reactor is connected to a synthesis gas inlet end of the moderate-pressure reactor, a synthesis gas outlet end of the moderate-pressure reactor is connected to a gas-liquid inlet of a second gas-liquid separator, and a gas outlet of the second gas-liquid separator is connected to the fuel cell.
In the above fuel cell system for hydrogen production by purifying and reforming biogas, the reformed gas outlet end of the reforming reactor is connected to the heat source inlet of the methane preheater, and the heat source outlet of the methane preheater is connected to the synthesis gas inlet end of the reactor.
In the above fuel cell system for producing hydrogen by purifying and reforming biogas, the reforming unit further comprises a syngas cooler, a syngas inlet of the syngas cooler is connected with a syngas outlet of the reforming reactor, a syngas outlet of the syngas cooler is connected with a gas-liquid inlet of the second gas-liquid separator, and a cooling water outlet of the syngas cooler is connected with a cooling water inlet of the reforming reactor.
In the above fuel cell system for hydrogen production by purifying and reforming biogas, the fuel outlet of the fuel storage device of the fuel cell is also connected to the fuel inlet of the reforming reactor, and is used for combusting with an external air source.
In the fuel cell system for producing hydrogen by purifying and reforming biogas, the steam outlet of the reforming reactor is connected with an external pipeline through a pressure regulator for supplying heat.
In the above fuel cell system for purifying and reforming biogas to produce hydrogen, the gas phase outlet of the first gas-liquid separator is connected with the fuel inlet of the reforming reactor through a temperature regulator.
In the above fuel cell system for purifying and reforming biogas to produce hydrogen, the fuel cell is a solid oxide fuel cell.
Compared with the prior art, the utility model has the advantages of:
1) the fuel cell is utilized to prepare the fuel through methane reforming for power generation, in the reforming reactor, steam at the outlet of the steam flow channel is mixed with preheated methane along the inlet of the reforming gas flow channel so as to further improve the inlet temperature of the reforming gas, and the steam is used as reaction gas to react with the methane, so that the conversion rate and the reaction rate of the methane can be effectively improved.
2) The heat exchanger in the system is designed to improve the utilization rate of energy, the layout is reasonable, only a biogas source, an air source and a water source exist in the whole system, the system discharges less and is pollution-free, and the system has the advantages of environmental protection and energy conservation.
Drawings
Fig. 1 is a process flow chart provided by the present invention.
In the figure, a biogas source 1, a first regulating valve 100, a biogas purification assembly 2, a biogas filter 200, an alkaline washing tank 201, a water washing tank 202, a first gas-liquid separator 210, a second regulating valve 211, a reforming unit 30, a reforming reactor 300, a methane preheater 302, a shift reactor 303, a syngas cooler 304, a second gas-liquid separator 305, a fuel cell 4, a fuel inlet regulating valve 400, a fuel outlet regulating valve 401, a temperature regulator 501, a pressure regulator 601, a flow regulator 700, a pure water source 80, an air source 90, and a third regulating valve 900 are shown.
Detailed Description
The present invention is further illustrated by the following examples.
As shown in fig. 1, a methane hydrogenation purification system based on a fuel cell includes a methane source 1, a methane purification assembly 2 connected to the methane source 1, a reforming unit 30 connected to the methane purification assembly 2, and a fuel cell 4, which are connected in sequence. Wherein the reforming unit 30 is connected to the fuel cell 4 for supplying fuel.
Specifically, the biogas source 1 is connected to a biogas purification assembly 2 through a first regulating valve 100, and the biogas purification assembly 2 is used for purifying biogas and comprises a biogas filter 200, an alkaline washing tank 201 and a water washing tank 202 which are sequentially connected and used for removing solid impurities and moisture in the biogas.
In this embodiment, the filter element 2000 of the biogas filter 200 is a biogas filter element purchased from a kno billion square filter plant in north Hebei to achieve the purpose of dust removal. The alkali washing tank 201 adopts NaOH solution or Na2CO3 solution, so that H2S gas and alkali liquor are subjected to sufficient chemical reaction. The water washing tank 202 is used for removing carbon dioxide in the biogas.
The outlet end of the water wash tank 202 is connected to the gas-liquid inlet of the first gas-liquid separator 210, condensed water is discharged by gas-liquid separation, and the gas outlet of the first gas-liquid separator 210 is connected to the reforming unit 30 through the second regulating valve 211.
The reforming unit 30 includes a methane preheater 302, a reforming reactor 300, a varnishing reactor 303, a syngas cooler 304, and a second gas-liquid separator 305. A preheated methane inlet of the methane preheater 302 is connected with a gas outlet of the first gas-liquid separator 213, a preheated methane outlet of the methane preheater 302 is connected with a reformed gas inlet end of the reforming reactor 300, a reformed gas outlet end of the reforming reactor 300 is connected with a synthetic gas inlet end of the reforming reactor 303, a synthetic gas inlet of the synthetic gas cooler 304 is connected with a synthetic gas outlet of the reforming reactor 303, a synthetic gas outlet of the synthetic gas cooler 304 is connected with a gas-liquid inlet of the second gas-liquid separator 305, a cooling water inlet of the synthetic gas cooler 304 is connected with a pure water source 80, a cooling water outlet of the synthetic gas cooler 304 is connected with a cooling water inlet of the reforming reactor 300, a steam outlet of the reforming reactor 300 is connected with a reformed gas inlet end of the reforming reactor 300 and is mixed with methane for reforming, and a flow regulator 700 is arranged between a steam outlet of the reforming reactor 300 and the reformed gas inlet end, the water-carbon ratio is used for controlling the steam inlet amount so as to control the water-carbon ratio of the reforming reaction, and the forward movement of the methane steam reforming reaction is promoted, and the water-carbon ratio is preferably 3.5. Meanwhile, the steam outlet of the reforming reactor 300 is connected with an external pipeline for supplying heat through an external pipe, and the external pipe is provided with a pressure regulator 601. The reformed gas outlet end of the reforming reactor 300 is connected to the heat source inlet of the methane preheater 302 and the heat source outlet of the methane preheater 302 is connected to the syngas inlet end of the reforming reaction for providing heat for preheating methane. The gas outlet of the second gas-liquid separator 305 is connected to a fuel storage device (not shown in the drawings) of the fuel cell 4 through a fuel inlet regulating valve 400 for supplying fuel.
The gas outlet of the first gas-liquid separator 210 is also connected to the fuel inlet of the reforming reactor 300 for combustion with an external air source. The fuel storage device of the fuel cell 4 is connected to the fuel inlet of the reforming reactor 300 through a fuel outlet regulating valve 401, and is used for combustion with an external air source.
In the present embodiment, the reforming reactor 300 is a steam methane reforming reactor, and it will be understood by those skilled in the art that the reforming reactor 300 can be used to reform methane and steam to generate a reformed gas composed of hydrogen, carbon monoxide, carbon dioxide, methane and steam. For example, chinese utility model patent [ application No.: 201420422313.1 discloses a reaction device for preparing synthesis gas by reforming methane and water vapor, and other commercially available methane and water vapor reforming devices can be selected.
In the embodiment, the medium temperature shift reactor 303 is used for medium temperature shift of the synthesis gas to reduce the content of carbon monoxide, which is the prior art that should be known to those skilled in the art, wherein the temperature of the medium temperature shift bed is 300-390 ℃, and the concentration of the carbon monoxide at the outlet is lower than 3%.
The fuel cell 4 is specifically a Solid Oxide Fuel Cell (SOFC), and those skilled in the art should understand that SOFC has the characteristics of high efficiency and environmental friendliness.
The external air source 90 is connected to the solid oxide fuel cell of the fuel cell 4 and the air inlet of the reforming reactor 300 through a third regulating valve 900, respectively, for supplying combustion-supporting gas.
The working principle of the utility model is as follows:
as shown in fig. 1, the first regulating valve 100 is opened, biogas in a biogas source 1 sequentially passes through a biogas filter 200, an alkaline washing tank 201 and a water washing tank 202 to be purified and then enters a first gas-liquid separator 210, the second regulating valve 211 is regulated, gas in the first gas-liquid separator 210 enters a reforming gas flow channel of a reforming reactor 300 after being preheated by a preheated methane flow channel of a methane preheater 302, high-temperature gas at an outlet of the reforming gas flow channel enters the methane preheater 302 to exchange heat with gas in the preheated methane flow channel and then enters a middle shift reactor, so that energy is effectively utilized, gas at an outlet of a steam flow channel of the reforming reactor 300 is mixed with preheated methane along an inlet of the reforming gas flow channel to further increase the inlet temperature of the reforming gas, and simultaneously, the gas is used as reaction gas to react with methane, so that the conversion rate and the reaction rate of the methane can be effectively increased, the middle shift reactor 303 reduces the content, and enters the second gas-liquid separator 305 through the cooling gas flow channel of the syngas cooler 304 to be separated to obtain the fuel gas of the fuel cell, wherein the water of the pure water source 80 passes through the syngas cooler 304 and exchanges heat with the cooling gas flow channel before entering the steam flow channel inlet of the reforming reactor 300 to reach a higher temperature, thereby reducing energy consumption.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Although terms of the biogas source 1, the first regulating valve 100, the biogas purification assembly 2, the biogas filter 200, the caustic wash tank 201, the water wash tank 202, the first gas-liquid separator 210, the second regulating valve 211, the reforming unit 30, the reforming reactor 300, the methane preheater 302, the shift reactor 303, the syngas cooler 304, the second gas-liquid separator 305, the fuel cell 4, the temperature regulator 501, the pressure regulator 601, the flow regulator 700, the pure water source 80, the air source 90, etc., are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention and should not be interpreted as imposing any additional limitations that are contrary to the spirit of the present invention.
Claims (10)
1. The utility model provides a marsh gas purifies reformation hydrogen manufacturing fuel cell system, includes marsh gas source (1), purifies subassembly (2) with marsh gas source (1) is connected marsh gas, purifies reforming unit (30) and fuel cell (4) that subassembly (2) is connected with marsh gas, its characterized in that:
the gas inlet end of the biogas purification component (2) is connected with the gas outlet end of the biogas source (1); the reforming unit (30) comprises a methane preheater (302) and a reforming reactor (300) for reforming methane and steam to produce hydrogen, a preheated methane inlet of the methane preheater (302) is connected with an air outlet end of the biogas purification assembly (2), a reformed gas inlet end of the reforming reactor (300) is connected with a preheated methane outlet of the methane preheater (302), a reformed gas outlet end of the reforming reactor (300) is connected with a fuel cell (4) for supplying fuel, and a steam outlet of the reforming reactor (300) is connected with the reformed gas inlet end of the reforming reactor (300) through a flow regulator (700) and is mixed with methane for reforming.
2. The fuel cell system for purifying and reforming biogas to produce hydrogen according to claim 1, characterized in that: the biogas purification component (2) comprises a biogas filter (200), an alkaline washing tank (201) and a water washing tank (202) which are connected in sequence.
3. The fuel cell system for purifying and reforming biogas to produce hydrogen according to claim 2, characterized in that: the biogas purification assembly (2) is connected with a gas-liquid inlet of a first gas-liquid separator (210), and a gas-phase outlet of the first gas-liquid separator (210) is connected with a preheated methane inlet of a methane preheater (302) of the reforming unit (30).
4. The fuel cell system for purifying and reforming biogas to produce hydrogen according to claim 3, characterized in that: the reforming unit (30) further comprises a moderate shift reactor (303), the reformed gas outlet end of the reforming reactor (300) is connected with the synthesis gas inlet end of the moderate shift reactor (303), the synthesis gas outlet end of the moderate shift reactor (303) is connected with the gas-liquid inlet of a second gas-liquid separator (305), and the gas outlet of the second gas-liquid separator (305) is connected with the fuel cell (4).
5. The fuel cell system for purifying and reforming biogas to produce hydrogen according to claim 4, characterized in that: the reformed gas outlet end of the reforming reactor (300) is connected to the heat source inlet of the methane preheater (302), and the heat source outlet of the methane preheater (302) is connected to the synthesis gas inlet end of the shift reactor (303).
6. The fuel cell system for purifying and reforming biogas to produce hydrogen according to claim 4, characterized in that: the reforming unit (30) further comprises a syngas cooler (304), wherein a syngas inlet of the syngas cooler (304) is connected with a syngas outlet of the pitch reactor (303), a syngas outlet of the syngas cooler (304) is connected with a gas-liquid inlet of the second gas-liquid separator (305), and a cooling water outlet of the syngas cooler (304) is connected with a cooling water inlet of the reforming reactor (300).
7. The fuel cell system for purifying and reforming biogas to produce hydrogen according to claim 1, characterized in that: the fuel outlet of the fuel storage device of the fuel cell (4) is also connected with the fuel inlet of the reforming reactor (300) and is used for combusting with an external air source.
8. The fuel cell system for purifying and reforming biogas to produce hydrogen according to claim 1, characterized in that: the steam outlet of the reforming reactor (300) is connected with an external pipeline through a pressure regulator (601) for supplying heat.
9. The fuel cell system for purifying and reforming biogas to produce hydrogen according to claim 3, characterized in that: the gas phase outlet of the first gas-liquid separator (210) is connected to the fuel inlet of the reforming reactor (300) through a temperature regulator.
10. The fuel cell system for purifying and reforming biogas to produce hydrogen according to claim 1, characterized in that: the fuel cell (4) is a solid oxide fuel cell.
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| CN201921974596.XU CN211238400U (en) | 2019-11-15 | 2019-11-15 | Fuel cell system for purifying and reforming biogas to produce hydrogen |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921974596.XU CN211238400U (en) | 2019-11-15 | 2019-11-15 | Fuel cell system for purifying and reforming biogas to produce hydrogen |
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Inventor after: Wu Jian Inventor after: Hu Qiang Inventor after: Zhang Guimin Inventor after: Lu Kang Inventor after: Gong Jingbo Inventor before: Wu Jian Inventor before: Hu Qiang Inventor before: Zhang Guimin Inventor before: Sun Xiaomao Inventor before: Lu Kang Inventor before: Gong Jingbo |