CN109860659B - Fuel supply self-driven direct methanol fuel cell and working method thereof - Google Patents
Fuel supply self-driven direct methanol fuel cell and working method thereof Download PDFInfo
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Abstract
A fuel supply self-driven direct methanol fuel cell and a working method thereof comprise a cell body, wherein a methanol buffer zone, a porous plate and a methanol evaporation zone are further arranged on the anode side of the cell body, carbon dioxide enters the carbon dioxide buffer zone through a carbon dioxide shunt valve, the carbon dioxide is heated and pressurized through a carbon dioxide pressurizing heat exchange pipeline to push a piston in a methanol storage tank to move to the methanol evaporation zone so as to stably convey liquid-phase methanol, and cell waste heat is used for heating the methanol evaporation zone through the cell heat exchange pipeline. The invention realizes the methanol supply and evaporation process without extra power consumption; the gradually-reducing and gradually-expanding structure is applied to a methanol evaporation area, so that the methanol evaporation process is more energy-saving and efficient; the methanol vapor with constant flow is obtained by accurately controlling the heat exchange quantity of the methanol working area and the evaporation area, the heat exchange quantity of the methanol working area and the carbon dioxide buffer area and the carbon dioxide supply quantity in the carbon dioxide buffer tank to participate in the cell reaction, so that the working efficiency and the stability of the methanol fuel cell are improved.
Description
Technical Field
The invention relates to the technical field of fuel cells, in particular to a fuel supply self-driven direct methanol fuel cell and a working method thereof.
Background
The direct methanol fuel cell has the advantages of simple structure, normal temperature operation, high specific energy of system volume, convenient fuel storage and transportation and the like, and has wide application prospect in the fields of communication, traffic, national defense and the like. At present, the research of direct methanol fuel cells is mostly concentrated in the field of taking liquid methanol as fuel, but because the fuel supply of the methanol fuel cells mostly needs to be mixed with water, the energy density of the fuel is reduced, and meanwhile, the serious methanol penetration problem exists in the operation process, so that when a large amount of raw materials are wasted, the energy utilization rate is reduced, the performance of the cell is seriously weakened, and the great difficulty is brought to the improvement of the performance of the methanol fuel cells.
Researches show that methanol can well reduce methanol penetration and further improve the utilization efficiency of methanol by participating in the reaction of the fuel cell in a steam form, but the fuel supply mode of the cell taking methanol steam as fuel is mostly an evaporation film evaporation form and an external heating device heating evaporation form, wherein the evaporation film evaporation form can not accurately control the flow of methanol in the use process, further influences the stable operation of the fuel cell, and the external heating device heating evaporation form increases the extra power consumption of the cell operation, further reduces the cell efficiency; meanwhile, the fuel supply pump is adopted for supplying liquid-phase methanol, so that extra power consumption is brought to further reduce the efficiency of the cell.
Therefore, in order to solve the problems of low efficiency, difficult distribution, easy leakage, etc. of the methanol fuel cell, a methanol fuel cell with high working efficiency, strong control precision and no extra power consumption is needed.
Disclosure of Invention
The invention aims to provide a fuel supply self-driven direct methanol fuel cell which can accurately, efficiently and stably operate and continuously output fuel without extra power consumption and an operating method thereof.
In order to achieve the aim, the fuel supply self-driven direct methanol fuel cell comprises a methanol fuel cell body, and a cathode flow field, a cathode diffusion layer, a cathode catalysis layer, a membrane, an anode catalysis layer, an anode diffusion layer and an anode flow field which are arranged in the methanol fuel cell body; wherein the diaphragm is connected with the cathode catalyst layer and the anode catalyst layer, the cathode diffusion layer is connected with the cathode flow field and the cathode catalyst layer, and the anode diffusion layer is connected with the anode catalyst layer and the anode flow field;
a methanol evaporation zone is arranged on the anode side of the methanol fuel cell body, a heat conducting plate with a plurality of methanol flow channels with gradually-reduced and gradually-enlarged structures is arranged on the inner outlet side of the methanol evaporation zone, a porous plate is arranged on the outlet side of the methanol evaporation zone, the other side of the porous plate is connected with a methanol buffer zone provided with a carbon dioxide discharge hole, and the other side of the methanol buffer zone is connected with an anode flow field; the inlet side of the methanol evaporation area is connected with a methanol storage tank through a methanol control valve, and the methanol storage tank is connected with a carbon dioxide buffer area made of heat conduction materials through a carbon dioxide control valve; the walls of the methanol evaporation zone and the carbon dioxide buffer zone are connected with the wall of the methanol fuel cell body through a surrounding external battery heat exchange pipeline to heat the heat conducting plate, and a carbon dioxide boosting heat exchange pipeline which is connected with the battery heat exchange pipeline to heat the carbon dioxide buffer zone is wound on the outer wall of the carbon dioxide buffer zone; the carbon dioxide discharge hole of the methanol buffer zone is externally connected with a carbon dioxide shunt valve, and the other two interfaces of the carbon dioxide shunt valve are respectively connected with the carbon dioxide buffer zone and air.
The cathode flow field and the anode flow field are made of conductive metal materials or carbon materials, wherein serpentine flow channels, parallel flow channels, discontinuous flow channels or interdigital flow channels are machined on the inner sides of the cathode flow field and the anode flow field.
The cathode diffusion layer and the anode diffusion layer are made of conductive metal materials or carbon materials with porous structures.
The cathode catalyst layer is a catalyst with catalytic reduction performance, and the anode catalyst layer is a catalyst with catalytic oxidation performance.
The diaphragm is a proton exchange membrane with proton conductivity.
The porous plate is a porous structure plate made of metal materials, carbon materials or organic materials.
The methanol control valve and the carbon dioxide control valve are one-way valves with one inlet and one outlet, and the carbon dioxide shunt valve is a three-way valve with one inlet and two outlets.
A movable piston is arranged in the methanol storage tank, and the piston and the tank body are both made of polyethylene or polyformaldehyde made of methanol-resistant materials.
The battery heat exchange pipeline and the carbon dioxide boosting heat exchange pipeline are gravity type heat pipes, wick liquid heat pipes or rotary heat pipes.
The working process of the invention is as follows:
step S100: after the methanol fuel cell is operated for a period of time in advance, high temperature generated on the wall surface of the methanol fuel cell body exchanges heat with a heat conducting plate in a methanol evaporation zone through a cell tube heat pipeline, and the temperature of the wall surface of an internal structure of the methanol evaporation zone is controlled by controlling the contact area of a cold end of the cell heat exchange pipeline and the methanol evaporation zone; carbon dioxide of an anode product of the methanol fuel cell enters a carbon dioxide buffer tank through a carbon dioxide shunt valve, the cold end of a carbon dioxide boosting heat exchange pipeline is in contact heat exchange with the wall surface of the carbon dioxide buffer tank to absorb heat and boost pressure of the carbon dioxide in the tank, a piston in a methanol storage tank is pushed to move to enable methanol to flow into a methanol evaporation area through a methanol control valve, then the cold end of the carbon dioxide boosting heat exchange pipeline is disconnected from being in contact with the carbon dioxide buffer tank to enable the carbon dioxide in the tank to be cooled and shrunk, the carbon dioxide shunt valve is controlled to enable the carbon dioxide of the anode product to flow into the carbon dioxide buffer tank for next circulation, and the flow of the; after methanol flows into the methanol evaporation zone, the methanol is compressed, heat exchanged and evaporated with the inner wall surface of the methanol evaporation zone through the gradually reducing structure to form methanol vapor, and the methanol vapor is uniformly mixed through the gradually expanding structure; methanol vapor flows into the methanol buffer zone from the methanol evaporation zone through the porous plate, so that the mixing is more uniform;
step S200: reaction and discharge of methanol vapor: methanol vapor is uniformly distributed through the anode flow field, and further flows into the anode catalyst layer through the anode diffusion layer to perform an oxidation reaction with water from the cathode side to generate carbon dioxide, electrons and protons, wherein the carbon dioxide is discharged to the atmosphere through the anode catalyst layer, the anode diffusion layer, the anode flow field and the methanol buffer area, the electrons are introduced into an external circuit through the anode catalyst layer, the anode diffusion layer and the anode flow field, and the protons pass through the membrane to migrate to the cathode catalyst layer under the action of an electric field; meanwhile, electrons enter the cathode catalyst layer through the cathode flow field and the cathode diffusion layer respectively by an external circuit, oxygen is pumped by an air pump or an oxygen bottle and enters the cathode catalyst layer through the cathode flow field and the cathode diffusion layer, protons from the anode side are subjected to reduction reaction with the oxygen and the protons in the cathode catalyst layer to generate water, and the water passes through the membrane to enter the anode catalyst layer under the action of concentration difference; the above process completes the methanol fuel cell discharge.
According to the invention, waste heat generated in the battery operation process is used as a heat source of a methanol evaporation area and a power source of a piston in a methanol storage tank through the battery heat exchange pipeline, so that the methanol supply and evaporation processes are realized on the premise of no extra power consumption; the methanol flow channel with the gradually-reduced and gradually-expanded structure is applied to the methanol evaporation area, so that the methanol gasification efficiency and the mixing degree can be improved to a greater extent; through the accurate control of the heat exchange quantity of the methanol working area and the evaporation area, the heat exchange quantity of the methanol working area and the carbon dioxide buffer area and the carbon dioxide supply quantity in the carbon dioxide buffer tank, the methanol vapor with constant flow is further obtained to participate in the cell reaction, and the working efficiency and the stability of the methanol fuel cell are further improved.
Compared with the prior art, the invention has the following advantages and effects:
(1) the invention adopts the self-heating self-circulation method to provide gas phase fuel for the battery, thereby effectively reducing methanol penetration, improving the output performance of the battery and further improving the fuel utilization rate of the battery;
(2) the fuel cell body is connected with the carbon dioxide buffer area through the cell heat exchange pipeline with the heat pipe structure, the outlet of the anode product is externally connected with the carbon dioxide buffer tank, and the piston in the methanol storage tank is provided with power through the cooperative management of the anode product of the fuel cell and the cell waste heat, so that the methanol fuel is supplied without extra power consumption;
(3) the fuel cell body is connected with the methanol evaporation zone through the cell heat exchange pipeline with the heat pipe structure, waste heat in the working process of the cell is used for heating the methanol evaporation zone and reducing the wall temperature of the fuel cell, and the gasification process of the methanol is realized without extra power consumption;
(4) compared with the traditional pervaporation technology, the method has the advantages that methanol vapor is provided for the cell, the heat exchange quantity of the methanol working area and the evaporation area and the supply quantity of cathode product water to the methanol storage tank are accurately controlled, the constant flow of methanol vapor is further obtained to participate in cell reaction, and the working efficiency and the stability of the methanol fuel cell are further improved;
(5) the methanol evaporation zone adopts a gradually-reduced and gradually-expanded structure, so that the methanol gasification efficiency can be improved to a greater extent, and methanol vapor can be fully mixed, thereby stably and uniformly providing methanol vapor for the battery, and realizing accurate and uniform material supply in space and time.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
In the figure, 1-a cathode flow field, 2-a cathode diffusion layer, 3-a cathode catalysis layer, 4-a membrane, 5-an anode catalysis layer, 6-an anode diffusion layer, 7-an anode flow field, 8-a methanol buffer zone, 9-a porous plate, 10-a methanol evaporation zone, 11-a methanol control valve, 12-a methanol storage tank, 13-a battery heat exchange pipeline, 14-a carbon dioxide shunt valve, 15-a carbon dioxide control valve, 16-a carbon dioxide buffer tank, 17-a carbon dioxide pressure-boosting heat exchange pipeline and 18-a heat-conducting plate.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the invention includes a methanol fuel cell body, and a cathode flow field 1, a cathode diffusion layer 2, a cathode catalysis layer 3, a membrane 4, an anode catalysis layer 5, an anode diffusion layer 6 and an anode flow field 7 which are arranged in the methanol fuel cell body; wherein the membrane 4 is connected with the cathode catalyst layer 3 and the anode catalyst layer 5, the cathode diffusion layer 2 is connected with the cathode flow field 1 and the cathode catalyst layer 3, and the anode diffusion layer 6 is connected with the anode catalyst layer 5 and the anode flow field 7;
the cathode flow field 1 is made of conductive materials such as metal materials and carbon materials, and runners are processed on the inner side of the cathode flow field 1, wherein the runners comprise serpentine runners, parallel runners, discontinuous runners, interdigital runners and the like in the case of an active methanol fuel cell, and comprise punctate runners, serpentine runners, parallel runners, discontinuous runners, interdigital runners and the like in the case of a passive methanol fuel cell; the cathode diffusion layer 2 should be a metal material having a porous structure or a conductive material such as a carbon material; the cathode catalyst layer 3 includes a catalyst having a catalytic reduction property; the membrane 4 should be a proton exchange membrane with proton conducting capacity; the anode catalyst layer 5 includes a catalyst having catalytic oxidation properties; the anode diffusion layer 6 should be a metal material having a porous structure or a conductive material such as a carbon material; the anode flow field 7 should be made of conductive materials such as metal materials and carbon materials, and flow channels are processed on the inner side of the cathode flow field 7, wherein the flow channels include serpentine flow channels, parallel flow channels, discontinuous flow channels, interdigital flow channels, and the like.
A methanol evaporation zone 10 is arranged on the anode side of the methanol fuel cell body, a heat conducting plate 18 with a plurality of methanol flow channels with gradually-reduced and gradually-enlarged structures is arranged on the inner outlet side of the methanol evaporation zone 10, a porous plate 9 is arranged on the outlet side of the methanol evaporation zone 10, the other side of the porous plate 9 is connected with a methanol buffer zone 8 with a carbon dioxide discharge hole, and the other side of the methanol buffer zone 8 is connected with an anode flow field 7; the inlet side of the methanol evaporation area 10 is connected with a methanol storage tank 12 through a methanol control valve 11, and the methanol storage tank 12 is connected with a carbon dioxide buffer area 16 made of heat conduction materials through a carbon dioxide control valve 15; the walls of the methanol evaporation zone 10 and the carbon dioxide buffer zone 16 are connected with the wall of the methanol fuel cell body through a surrounding external battery heat exchange pipeline 13 to heat the heat conducting plate 18, and a carbon dioxide boosting heat exchange pipeline 17 which is connected with the battery heat exchange pipeline 13 to heat the carbon dioxide buffer zone 16 is wound on the outer wall of the carbon dioxide buffer zone 16; a carbon dioxide shunt valve 14 is externally connected with a carbon dioxide discharge hole of the methanol buffer zone 8, and the other two interfaces of the carbon dioxide shunt valve 14 are respectively connected with a carbon dioxide buffer zone 16 and air.
See the examples in which the porous plate 9 should be a porous structure plate of a metal material, a carbon material, an organic material, or the like; the methanol control valve 11 is of a one-inlet one-outlet one-way valve structure; a movable piston is arranged in the methanol storage tank 12, and the piston and the tank body are made of methanol-resistant materials, wherein the methanol-resistant materials comprise polyethylene or polyformaldehyde and the like; the battery heat exchange pipeline 13 is a heat pipe structure and comprises a gravity type heat pipe, a liquid absorption core heat pipe and a rotary heat pipe; the carbon dioxide splitter valve 14 should be a three-way valve structure with one inlet and two outlets; the carbon dioxide control valve 15 should be a one-way valve structure with one inlet and one outlet; the tank body of the carbon dioxide buffer tank 16 is made of heat conducting materials; the carbon dioxide boosting heat exchange pipeline 17 is a heat pipe structure and comprises a gravity type heat pipe, a liquid absorption core heat pipe and a rotary heat pipe.
The working process of the invention is as follows:
step S100: after the methanol fuel cell is operated for a period of time in advance, high temperature generated on the wall surface of the methanol fuel cell body exchanges heat with the heat conducting plate 18 in the methanol evaporation zone 10 through the cell tube heat pipeline 13, and the temperature of the wall surface of the internal structure of the methanol evaporation zone 10 is controlled by controlling the contact area 10 of the cold end of the cell heat exchange pipeline 13 and the methanol evaporation zone; carbon dioxide of an anode product of the methanol fuel cell enters a carbon dioxide buffer tank 16 through a carbon dioxide diverter valve 14, the cold end of a carbon dioxide boosting heat exchange pipeline 17 is in contact heat exchange with the wall surface of the carbon dioxide buffer tank 16 to absorb heat and boost pressure of the carbon dioxide in the tank, a piston in a methanol storage tank 12 is pushed to move to enable methanol to flow into a methanol evaporation area 10 through a methanol control valve 11, then the cold end of the carbon dioxide boosting heat exchange pipeline 17 is disconnected from being in contact with the carbon dioxide buffer tank 16 to enable the carbon dioxide in the tank to be cooled and shrunk, the carbon dioxide diverter valve 14 is controlled to enable the carbon dioxide of the anode product to flow into the carbon dioxide buffer tank 16 for next circulation, and the flow of the methanol is; after methanol flows into the methanol evaporation zone 10, the methanol is compressed, heat exchanged and evaporated with the inner wall surface of the methanol evaporation zone 10 through a gradually reducing structure to form methanol vapor, and the methanol vapor is uniformly mixed through a gradually expanding structure; methanol vapor flows into the methanol buffer zone 8 from the methanol evaporation zone 10 through the porous plate 9, so that the mixing is more uniform;
step S200: reaction and discharge of methanol vapor: methanol vapor is uniformly distributed through the anode flow field 7, and further flows into the anode catalysis layer 5 through the anode diffusion layer 6 to perform oxidation reaction with water from the cathode side, so as to generate carbon dioxide, electrons and protons, wherein the carbon dioxide is discharged to the atmosphere through the anode catalysis layer 5, the anode diffusion layer 6, the anode flow field 7 and the methanol buffer zone 8, the electrons are led into an external circuit through the anode catalysis layer 5, the anode diffusion layer 6 and the anode flow field 7, and the protons pass through the membrane 4 and migrate to the cathode catalysis layer 3 under the action of an electric field; meanwhile, electrons enter the cathode catalyst layer 3 through the cathode flow field 1 and the cathode diffusion layer 2 respectively by an external circuit, oxygen is pumped by an air pump or an oxygen bottle and enters the cathode catalyst layer 3 through the cathode flow field 1 and the cathode diffusion layer 2, protons from the anode side are subjected to reduction reaction with the oxygen and the protons in the cathode catalyst layer 3 to generate water, and the water passes through the membrane 4 to enter the anode catalyst layer 5 under the action of concentration difference; the above process completes the methanol fuel cell discharge.
The invention adopts the self-heating self-circulation method to provide gas phase fuel for the battery, thereby effectively reducing methanol penetration, improving the output performance of the battery and further improving the fuel utilization rate of the battery; the fuel cell body is connected with the carbon dioxide buffer area through a cell heat exchange pipeline with a heat pipe structure, an anode product outlet is externally connected with a carbon dioxide buffer tank, and a piston in the methanol storage tank is provided with power through the cooperative management of the anode product of the fuel cell and the cell waste heat, so that the supply of methanol fuel is realized without extra power consumption; the fuel cell body is connected with the methanol evaporation zone through a cell heat exchange pipeline with a heat pipe structure, waste heat in the working process of the cell is used for heating the methanol evaporation zone and reducing the wall temperature of the fuel cell, and the gasification process of the methanol is realized without extra power consumption; compared with the traditional pervaporation technology, the method has the advantages that methanol vapor is provided for the cell, the heat exchange quantity of the methanol working area and the evaporation area and the supply quantity of cathode product water to the methanol storage tank are accurately controlled, the constant flow of methanol vapor is further obtained to participate in cell reaction, and the working efficiency and the stability of the methanol fuel cell are further improved; the methanol evaporation zone adopts a gradually-reducing and gradually-expanding structure, the methanol gasification efficiency can be improved to a greater extent, and methanol vapor is fully mixed, so that the methanol vapor can be stably and uniformly supplied to the cell, and accurate and uniform feeding in space and time is realized.
Claims (10)
1. A fuel supply self-driven direct methanol fuel cell is characterized by comprising a methanol fuel cell body, and a cathode flow field (1), a cathode diffusion layer (2), a cathode catalysis layer (3), a membrane (4), an anode catalysis layer (5), an anode diffusion layer (6) and an anode flow field (7) which are arranged in the methanol fuel cell body; wherein the diaphragm (4) is connected with the cathode catalyst layer (3) and the anode catalyst layer (5), the cathode diffusion layer (2) is connected with the cathode flow field (1) and the cathode catalyst layer (3), and the anode diffusion layer (6) is connected with the anode catalyst layer (5) and the anode flow field (7);
a methanol evaporation area (10) is arranged on the anode side of the methanol fuel cell body, a heat conducting plate (18) with a plurality of methanol flow channels with gradually-reduced and gradually-expanded structures is arranged on the inner outlet side of the methanol evaporation area (10), a porous plate (9) is arranged on the outlet side of the methanol evaporation area (10), the other side of the porous plate (9) is connected with a methanol buffer area (8) provided with a carbon dioxide discharge hole, and the other side of the methanol buffer area (8) is connected with an anode flow field (7); the inlet side of the methanol evaporation area (10) is connected with a methanol storage tank (12) through a methanol control valve (11), and the methanol storage tank (12) is connected with a carbon dioxide buffer tank (16) made of heat conduction materials through a carbon dioxide control valve (15); the methanol evaporation area (10) and the wall surface of the carbon dioxide buffer tank (16) are connected with the wall surface of the methanol fuel cell body through a surrounding external battery heat exchange pipeline (13) to heat the heat conducting plate (18), and a carbon dioxide boosting heat exchange pipeline (17) which is connected with the battery heat exchange pipeline (13) to heat the carbon dioxide buffer tank (16) is wound on the outer wall of the carbon dioxide buffer tank (16); a carbon dioxide shunt valve (14) is externally connected with a carbon dioxide discharge hole of the methanol buffer area (8), and the other two interfaces of the carbon dioxide shunt valve (14) are respectively connected with a carbon dioxide buffer tank (16) and air.
2. The fuel supply self-driven direct methanol fuel cell according to claim 1, wherein the cathode flow field (1) and the anode flow field 7 are made of conductive metal material or carbon material, and serpentine flow channels, parallel flow channels, discontinuous flow channels or interdigitated flow channels are formed on the inner sides of the cathode flow field (1) and the anode flow field 7.
3. The fuel-fed self-driven direct methanol fuel cell according to claim 1, wherein the cathode diffusion layer (2) and the anode diffusion layer 6 are conductive metal materials or carbon materials having a porous structure.
4. The fuel-fed self-driven direct methanol fuel cell according to claim 1, wherein the cathode catalytic layer (3) is a catalyst having catalytic reduction performance, and the anode catalytic layer (5) is a catalyst having catalytic oxidation performance.
5. The fuel-fed self-driven direct methanol fuel cell according to claim 1, characterized in that the membrane (4) is a proton exchange membrane with proton conducting capacity.
6. The fuel-fed self-driven direct methanol fuel cell according to claim 1, characterized in that the porous plate (9) is a porous structure plate of a metal material, a carbon material, or an organic material.
7. The fuel supply self-driven direct methanol fuel cell according to claim 1, wherein the methanol control valve (11) and the carbon dioxide control valve (15) are one-in one-out check valves, and the carbon dioxide split valve (14) is a one-in two-out three-way valve.
8. The fuel-fed self-driven direct methanol fuel cell as claimed in claim 1, wherein the methanol storage tank (12) is provided with a movable piston, and the piston and the tank are made of polyethylene or polyoxymethylene which are methanol-resistant materials.
9. The fuel-fed self-powered direct methanol fuel cell according to claim 1 wherein the battery heat exchange line (13), the carbon dioxide boost heat exchange line (17) are gravity heat pipes, wick heat pipes or rotary heat pipes.
10. A method of operating a fuel-fed self-driven direct methanol fuel cell as defined in claim 1, wherein:
step S100: after the methanol fuel cell is operated for a period of time in advance, high temperature generated on the wall surface of the methanol fuel cell body exchanges heat with a heat conduction plate (18) in a methanol evaporation zone (10) through a cell tube heat pipeline (13), and the temperature of the wall surface of an internal structure of the methanol evaporation zone (10) is controlled by controlling the contact area of the cold end of the cell heat exchange pipeline (13) and the methanol evaporation zone (10); carbon dioxide of an anode product of the methanol fuel cell enters a carbon dioxide buffer tank (16) through a carbon dioxide shunt valve (14), the cold end of a carbon dioxide boosting heat exchange pipeline (17) is in contact with the wall surface of the carbon dioxide buffer tank (16) for heat exchange to enable the carbon dioxide in the tank to absorb heat and boost pressure, a piston in a methanol storage tank (12) is pushed to move to enable methanol to flow into a methanol evaporation area (10) through a methanol control valve (11), then the cold end of the carbon dioxide boosting heat exchange pipeline (17) is disconnected to be in contact with the carbon dioxide buffer tank (16) to reduce the temperature and shrink the carbon dioxide in the tank, the carbon dioxide shunt valve (14) is controlled to make the anode product carbon dioxide flow into the carbon dioxide buffer tank (16) for the next circulation, the flow of methanol is controlled by controlling the amount of gas of carbon dioxide entering a carbon dioxide buffer tank (16) and the contact time of the cold end of a carbon dioxide boosting heat exchange pipeline (17) and the carbon dioxide buffer tank (16); after methanol flows into the methanol evaporation zone (10), the methanol is compressed, heat exchanged and evaporated with the inner wall surface of the methanol evaporation zone (10) through a gradually reducing structure to form methanol vapor, and the methanol vapor is uniformly mixed through a gradually expanding structure; methanol vapor flows into a methanol buffer zone (8) from a methanol evaporation zone (10) through a porous plate (9), so that the mixing is more uniform;
step S200: reaction and discharge of methanol vapor: methanol vapor is uniformly distributed through the anode flow field (7), and further flows into the anode catalyst layer (5) through the anode diffusion layer (6) to perform an oxidation reaction with water from the cathode side, so that carbon dioxide, electrons and protons are generated, the carbon dioxide is discharged to the atmosphere through the anode catalyst layer (5), the anode diffusion layer (6), the anode flow field (7) and the methanol buffer area (8), the electrons are respectively led into an external circuit through the anode catalyst layer (5), the anode diffusion layer (6) and the anode flow field (7), and the protons pass through the membrane (4) under the action of an electric field and migrate to the cathode catalyst layer (3); meanwhile, electrons enter the cathode catalyst layer (3) through the cathode flow field (1) and the cathode diffusion layer (2) respectively by an external circuit, oxygen is pumped by an air pump or an oxygen bottle and enters the cathode catalyst layer (3) through the cathode flow field (1) and the cathode diffusion layer (2), protons from the anode side are subjected to reduction reaction with the oxygen and the protons in the cathode catalyst layer (3) to generate water, and the water passes through the diaphragm (4) to enter the anode catalyst layer (5) under the action of concentration difference; the above process completes the methanol fuel cell discharge.
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| KR100718114B1 (en) * | 2005-05-25 | 2007-05-15 | 삼성에스디아이 주식회사 | Fuel cell system comprising structure for supplying fuel in vapor phase |
| US7625649B1 (en) * | 2006-05-25 | 2009-12-01 | University Of Connecticut | Vapor feed fuel cells with a passive thermal-fluids management system |
| KR20170080945A (en) * | 2015-12-31 | 2017-07-11 | 현대중공업 주식회사 | Ship |
| CN206340609U (en) * | 2016-12-15 | 2017-07-18 | 中氢新能技术有限公司 | A kind of methanol fuel cell utilized based on reformation and the integrated efficiency of pile |
| CN206210931U (en) * | 2016-12-15 | 2017-05-31 | 中氢新能技术有限公司 | A kind of intelligent feeding system for alcohol water fuel cell |
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