CN109244507B - Fuel cell hydrogen reflux method - Google Patents
Fuel cell hydrogen reflux method Download PDFInfo
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- CN109244507B CN109244507B CN201811057829.XA CN201811057829A CN109244507B CN 109244507 B CN109244507 B CN 109244507B CN 201811057829 A CN201811057829 A CN 201811057829A CN 109244507 B CN109244507 B CN 109244507B
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- 238000010992 reflux Methods 0.000 title claims abstract description 273
- 239000000446 fuel Substances 0.000 title claims abstract description 95
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims abstract description 87
- 239000001257 hydrogen Substances 0.000 title claims abstract description 86
- 229910052739 hydrogen Inorganic materials 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000002347 injection Methods 0.000 claims description 34
- 239000007924 injection Substances 0.000 claims description 34
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 5
- 239000013589 supplement Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 6
- 238000004134 energy conservation Methods 0.000 abstract 1
- 238000005265 energy consumption Methods 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000012495 reaction gas Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
- H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
- H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
- H01M8/04104—Regulation of differential pressures
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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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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
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Abstract
The invention relates to a fuel cell hydrogen reflux method, and belongs to the field of fuel cells. The reflux working mode provided by the invention comprises the following steps: combining the operating characteristics of the jet reflux device and the electric reflux pump, and operating the electric reflux pump in a low-power section; the high-power section jet reflux device works, the respective characteristics are overlapped, and the advantages of the high-power section jet reflux device and the high-power section jet reflux device are combined together, so that the high-efficiency reflux effect of the fuel cell under all working conditions is realized. The equipment used by the method has the advantages of convenient operation, simple system control, energy conservation and the like.
Description
Technical Field
The invention belongs to the field of fuel cells, and particularly relates to a hydrogen backflow method of a fuel cell.
Background
The hydrogen reflux pump is used for pumping unreacted hydrogen from the outlet of the fuel cell to the inlet of the fuel cell directly on the hydrogen loop of the power generation system of the fuel cell, and the unreacted hydrogen is converged with the inlet reaction gas and then enters the fuel cell. On one hand, the reflux pump can be used for realizing that the moisture of the tail gas of the reaction gas is brought into the battery to play a role in humidification; on the other hand, the flow rate of hydrogen in the anode flow channel of the fuel cell can be improved, the accumulation of anode water is prevented, and anode flooding is avoided; meanwhile, the purpose of improving the utilization rate of hydrogen is achieved.
There are two current methods for achieving reflux, jet reflux and electric reflux pumps. The reflux capacity of the jet reflux device has limited working range, and only works under large flow and large pressure difference, namely, the reflux effect is generated when the fuel cell has large air quantity under large power; when the fuel cell works at low power, the air quantity is small, and the jet mixer hardly flows back under the condition of small pressure difference; the electric reflux pump adopts a motor to drive a positive displacement compressor, realizes reflux quantity by adjusting the rotation speed of the motor, controls the motor to generate different reflux capacities by adopting a motor speed changing method so as to meet the humidification and drainage functions of the fuel cell, but has large volume and weight, high energy consumption and increases the electric function consumption and the system control complexity.
Operating characteristics of the fuel cell: the hydrogen consumption increases as the output power increases, and the pressure difference between the fuel cell inlet and outlet increases synchronously. The operating characteristics of the jet reflux are: the mechanical structure does not need motor driving, the suction force of the backflow of the mechanical structure is increased along with the increase of the pressure difference between the inlet and outlet of the fluid, and the greater the pressure difference between the inlet and outlet of the fluid is, the greater the suction force formed by the backflow port is, the higher the working threshold is, and the backflow requirement of the fuel cell in the low-power section cannot be met. The operating characteristics of the electric reflux pump are: the flow rate of the hydrogen reflux is increased along with the increase of the rotating speed, and the larger the flow rate and the pressure difference of the hydrogen reflux are, the larger the energy consumption is, especially in a high-power section of the fuel cell, the energy consumption is exponentially increased, and the comprehensive efficiency of the fuel cell is reduced.
Based on the above, it can be derived that: the traditional jet reflux device and method can not meet the conditions of low power and low gas quantity of the fuel cell, and the electric reflux pump works under the conditions of high power and high gas quantity of the fuel cell, so that the pump body and the weight are increased, and the power consumption is exponentially increased.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a fuel cell hydrogen reflux method, and the reflux working mode provided by the invention is as follows: the advantages of the operating characteristics of the injection reflux device and the electric reflux pump are fused together, and the efficient reflux effect of the fuel cell under all working conditions is realized. The equipment used by the method is convenient to operate, the system is simple to control, and the energy is saved.
The above object of the present invention is achieved by the following technical solutions:
combining the operating characteristics of the jet reflux device and the electric reflux pump, and operating the electric reflux pump in a low-power section; the high-power section jet reflux device works to realize the high-efficiency reflux effect of the fuel cell under all working conditions.
The working mode device provided by the invention comprises the following components: the device comprises an injection reflux device, an injection reflux device inlet, an injection reflux device outlet, an injection reflux device upper air suction port, an injection reflux device lower air suction port, a fuel cell inlet, a fuel cell hydrogen outlet, an electric reflux pump body, an electric reflux pump inlet and an electric reflux pump exhaust port;
the jet reflux device applied by the invention is different from the conventional jet reflux device in that the conventional jet reflux device is provided with only one air suction port, and the jet reflux device designed by the invention is provided with two air suction ports respectively: an upper air suction port of the jet reflux device and a lower air suction port of the jet reflux device, wherein the upper air suction port of the jet reflux device is connected with a branch pipe of a hydrogen outlet of the fuel cell; the lower air suction port of the jet reflux device is connected with the air exhaust port of the electric reflux pump, the hydrogen outlet of the fuel cell is connected with the inlet of the electric reflux pump, the inlet of the jet reflux device is connected with the hydrogen source, and the outlet of the jet reflux device is connected with the inlet of the fuel cell.
Combining an injection reflux device with two air inlets and an electric reflux pump in series, combining the working characteristics of the injection reflux device and the electric reflux pump, and operating the electric reflux pump in a low-power section; the high-power section jet reflux device works, the respective characteristics are overlapped, the advantages of the high-power section jet reflux device and the high-power section jet reflux device are combined together to form a special working characteristic curve, and the high-efficiency reflux effect of the fuel cell under the working condition is achieved.
Further, the fuel cell has two hydrogen manifolds; one branch pipe is connected with the hydrogen outlet of the fuel cell and the air suction port on the jet reflux device, and the other branch pipe is connected with the hydrogen outlet of the fuel cell and the inlet of the electric reflux pump;
further, the jet reflux device with two air inlets is designed according to specific use conditions in terms of the position and the diameter of the air inlets.
The invention provides a fuel cell hydrogen reflux method, which comprises the following specific operation steps:
firstly, calibrating the working characteristic curve of the jet reflux device, namely, the electric reflux pump does not work, and gradually increasing the hydrogen supply quantity to form the working characteristic curve; as shown in fig. 2, when the hydrogen supply amount is small, there is no reflux amount, and when the hydrogen supply amount reaches the threshold value, there is started the reflux amount, and as the amount of the gas and the pressure increase, an injection reflux operation characteristic curve is formed;
secondly, taking the hydrogen supply quantity threshold calibrated in the first step as a maximum rotating speed working point of the electric reflux pump, namely, when the hydrogen quantity is in a working condition before reaching the threshold, the hydrogen quantity is a working section of the electric reflux pump so as to supplement a blank generated when the jet reflux device does not have reflux quantity;
thirdly, independently designing the working rotation speed and the working characteristic curve of the electric reflux pump according to the hydrogen quantity corresponding to the threshold value calibrated in the second step, calibrating the required reflux quantity of the fuel cell, and forming a flow working characteristic curve of the electric reflux pump at different rotation speeds as shown in fig. 3, wherein the electric reflux pump adopts a positive displacement compressor and forms different flow through motor speed regulation;
the fourth step, in practical application, the electric reflux pump and the injection reflux pump with the working characteristic curves calibrated in the third step are respectively connected with the fuel cell, and the working characteristic curves are formed by fusing the characteristic curves of the injection reflux pump and the electric reflux pump, so as to form a curve shown in figure 4; finding the flow value of the electric reflux pump corresponding to the threshold value of the jet reflux device, corresponding to the rotating speed of the motor, and taking the value as a constant speed value (figure 5), wherein the value corresponding to the highest rotating speed of the motor is the reflux starting value of the jet reflux device; obtaining a new characteristic curve of the electric reflux pump;
fifthly, as shown in fig. 6, fitting the operation characteristic curve of the injection reflux device and the new operation characteristic curve of the electric reflux pump to form a compound operation characteristic curve which can cover the reflux quantity of the fuel cell under the complete working condition from small flow to large flow;
a sixth step, according to the composite working characteristic curve obtained in the fifth step, hydrogen flows into the fuel cell through the jet reflux device to participate in the reaction, unreacted hydrogen is divided into two paths, one path flows into an air suction port on the jet reflux device through a hydrogen pipeline, and the hydrogen continuously and circularly participates in the reaction; the other path of the hydrogen flows into the electric reflux pump, is discharged from the exhaust port of the electric reflux pump after being compressed, enters the lower air suction port of the jet reflux device, and the hydrogen continuously circulates to participate in the reaction.
Further, the pump body of the electric reflux pump is a positive displacement compressor, can be a reciprocating piston type or a diaphragm type, and the driving motor can be a variable frequency motor or a servo motor.
The working characteristics of the jet reflux device and the electric reflux pump are combined together, the suction port of the jet reflux device is connected with the electric reflux pump in series, namely the electric reflux pump works under the working condition of low power and low flow, the jet reflux device works under the working condition of high power and high flow, and the working characteristic curves of the jet reflux device and the electric reflux pump are fit into a reflux quantity which meets the power requirement of a fuel cell, so that the aims of draining and humidifying under the dynamic complete working condition are fulfilled.
Compared with the prior art, the invention has the beneficial effects that: the volume and the weight of the reflux device are reduced; the required reflux quantity of the fuel cell in the complete power range can be satisfied; the comprehensive efficiency of the fuel cell is improved; the hydrogen utilization rate is improved, the power consumption is reduced, and the noise and vibration are reduced; the purposes of dynamic obtaining, drainage under the complete working condition and humidification are realized; the system is simple to control, convenient to operate and energy-saving.
Drawings
The invention will be further described with reference to the drawings and examples.
Fig. 1 is a schematic diagram of the overall structure of the fuel cell hydrogen reflow method application apparatus of the present invention.
Fig. 2 is a graph of the operating characteristics of the jet reflux device of the present invention.
Fig. 3 is a graph of the operating characteristics of the electric reflux pump of the present invention.
Fig. 4 is a superimposed graph of the operating characteristics of the jet reflux and the electric reflux pump.
Fig. 5 is a graph of new operating characteristics of the electric reflux pump.
FIG. 6 is a graph of a composite operating characteristic of an injection-return operating characteristic fitted to a new operating characteristic of an electric return pump; wherein curve a represents the curve of the independent operation of the electric reflux pump; curve b represents the independent operation of the jet reflux; curve c represents the combined return operating curve of the two, i.e. the operating curve of the inventive application device.
Fig. 7 is a schematic diagram of a series arrangement of an ejector reflux and an electric reflux pump in the present invention.
In the figure, the fuel cell is characterized by comprising a jet reflux device 1, a jet reflux device inlet 2, a jet reflux device upper air suction port 3, a jet reflux device lower air suction port 4, a jet reflux device outlet 5, a fuel cell inlet 6, a fuel cell 7, a fuel cell hydrogen outlet 8, an electric reflux pump inlet 9, an electric reflux pump body 10 and an electric reflux pump exhaust port 11.
Detailed Description
The present invention is described in detail below by way of specific examples, but the scope of the present invention is not limited thereto. Unless otherwise specified, the experimental methods adopted in the invention are all conventional methods, and all experimental equipment, materials and the like used can be obtained from commercial sources.
Example 1
A fuel cell hydrogen gas reflux method: a fuel cell hydrogen reflow apparatus is applied, as shown in fig. 1, comprising: an injection reflux device 1, an injection reflux device inlet 2, an injection reflux device upper air suction port 3, an injection reflux device lower air suction port 4, an injection reflux device outlet 5, a fuel cell inlet 6, a fuel cell 7, a fuel cell hydrogen outlet 8, an electric reflux pump inlet 9, an electric reflux pump body 10 and an electric reflux pump exhaust port 11; the reflux device is applied to the fuel cell, wherein the air suction port 3 on the jet reflux device is connected with a branch pipe of the hydrogen outlet 8 of the fuel cell 7; wherein the lower air suction port 4 of the jet reflux device is connected with the air exhaust port 11 of the electric reflux pump, the hydrogen outlet 8 of the fuel cell 7 is connected with the inlet 9 of the electric reflux pump, the inlet 2 of the jet reflux device is connected with a hydrogen source, and the outlet 5 of the jet reflux device is connected with the inlet 6 of the fuel cell. The fuel cell outlet 8 has two branch pipes, which are respectively connected with the upper air suction port 3 of the jet reflux device and the inlet 9 of the electric reflux pump.
The closer the electric return pump is connected to the fuel cell, which can help reduce the generation of condensed water, the better the use effect.
A fuel cell hydrogen reflux method comprises the following operation steps:
firstly, calibrating the working characteristic curve of the jet reflux device 1, namely, the electric reflux pump does not work, and gradually increasing the hydrogen supply quantity to form the working characteristic curve; when the hydrogen supply amount is smaller, no reflux amount exists, and when the hydrogen supply amount reaches a threshold value, the reflux amount starts to exist, and the working characteristic curve of the jet reflux device 1 is formed along with the increase of the air amount and the pressure;
secondly, taking the hydrogen supply quantity threshold calibrated in the first step as a maximum rotating speed working point of the electric reflux pump, namely, when the hydrogen quantity is in a working condition before reaching the threshold, the hydrogen quantity is a working section of the electric reflux pump so as to supplement a blank generated when the jet reflux device 1 does not have reflux quantity;
thirdly, independently designing the working speed and the working characteristic curve of the electric reflux pump according to the hydrogen quantity corresponding to the threshold value calibrated in the second step and the reflux quantity required by the fuel cell 7, calibrating to form flow working characteristic curves at different speeds of the electric reflux pump, wherein the electric reflux pump adopts a positive displacement compressor, and different flows are formed through motor speed regulation;
the fourth step, in practical application, the electric reflux pump and the injection reflux device 1 with the working characteristic curves calibrated in the third step are respectively connected with the fuel cell 7, the working characteristic curves are superposition of the working curves of the two, and the working characteristic curves of the injection reflux device 1 and the electric reflux pump are superposed; finding a flow value of the electric reflux pump corresponding to the threshold value of the jet reflux device 1, corresponding to the rotating speed of the motor, and taking the value as a constant speed value, wherein the value corresponding to the highest rotating speed of the motor is the reflux starting value of the jet reflux device 1; obtaining a new working characteristic curve of the electric reflux pump
Fifthly, fitting the working characteristic curve of the jet reflux device 1 and the new working characteristic curve of the electric reflux pump to form a compound working characteristic curve which can cover the power of the fuel cell 7 and the reflux quantity of the complete working condition from small to large;
step six, according to the composite working characteristic curve obtained in the step five, hydrogen flows into the fuel cell 7 through the jet reflux device 1 to participate in the reaction, unreacted hydrogen is divided into two paths, one path flows into the air suction port 3 on the jet reflux device through a hydrogen pipeline, and the hydrogen continuously and circularly participates in the reaction; the other path of the hydrogen flows into the electric reflux pump, is discharged from the exhaust port 11 of the electric reflux pump after being compressed, enters the lower air suction port 4 of the jet reflux device, and the hydrogen continues to circulate and participate in the reaction.
The pump body of the electric reflux pump in the above embodiment is a positive displacement compressor, and may be a reciprocating piston type, a diaphragm type, or the like, and the driving motor may be a variable frequency motor, a servo motor, or the like.
As shown in a curve a of FIG. 6, the electric reflux pump adopts a positive displacement compressor and is driven by a speed regulating motor to form flow operating characteristic curves at different rotating speeds. As shown in curve b of fig. 3, the operating characteristic curve of the jet reflux device has no reflux quantity before the threshold value under the working condition of small air quantity. As shown in a curve c of fig. 3, the working characteristics of the injection reflux device 1 and the electric reflux pump are overlapped, the flow value of the electric reflux device corresponding to the threshold value of the injection reflux device 1 is found, the flow value corresponds to the rotation speed of the motor, and the flow value is used as a constant speed value to form the working characteristics of the invention, the working condition of the invention can cover the power of the fuel cell, and the reflux quantity of the complete working condition from small flow to large flow.
The working characteristics of the injection reflux device 1 and the electric reflux pump are combined together, and when the injection reflux device 1 and the electric reflux pump are connected in series, namely the electric reflux pump works under the working condition of low power and low flow, the injection reflux device works under the working condition of high power and high flow, the two working characteristic curves are fitted into a reflux quantity which meets the power requirement of a fuel cell, and the aims of drainage and humidification under the dynamic complete working condition are fulfilled.
Example 2
The hydrogen reflux device for fuel cell is applicable to fuel cell, as shown in FIG. 7, and comprises: jet reflux 1, fuel cell 7, electric reflux pump; the jet reflux device 1 includes: an injection return inlet 2, an injection return upper suction inlet 3, an injection return lower suction inlet 4, and an injection return outlet 5; the fuel cell 7 is provided with a fuel cell inlet 6 and a fuel cell hydrogen outlet 8; the electric reflux pump consists of an electric reflux pump inlet 9, an electric reflux pump body 10 and an electric reflux pump exhaust port 11; the electric reflux pump and the jet reflux device 1 are connected in series to form a reflux device, wherein an air suction port 3 on the jet reflux device is connected with a branch pipe of a hydrogen outlet 8 of the fuel cell 7; the lower air suction port 4 of the jet reflux device is connected with the air exhaust port 11 of the electric reflux pump, the hydrogen outlet 8 of the fuel cell 7 is connected with the inlet 9 of the electric reflux pump, the inlet 2 of the jet reflux device is connected with a hydrogen source, and the outlet 5 of the jet reflux device is connected with the inlet 6 of the fuel cell.
The fuel cell outlet 8 has two branches connected to the upper suction port 3 of the jet reflux unit 1 and the inlet 9 of the electric reflux pump, respectively.
The flow corresponding to the constant rotation speed point of the electric reflux pump is equal to the threshold flow of the jet reflux device 1.
The above-described embodiments are only preferred embodiments of the invention, and not all embodiments of the invention are possible. Any obvious modifications thereof, which would be apparent to those skilled in the art without departing from the principles and spirit of the present invention, should be considered to be included within the scope of the appended claims.
Claims (6)
1. A fuel cell hydrogen reflux method is characterized in that when in a low-power section, an electric reflux pump works, and a high-power section jet reflux device works, so that the required reflux quantity of the fuel cell in the complete power range can be met;
the specific operation steps are as follows:
firstly, calibrating a characteristic curve of an injection reflux device (1), namely, gradually increasing the hydrogen supply amount when an electric reflux pump does not work to form a working characteristic curve; when the hydrogen supply quantity is smaller, no reflux quantity exists, when the hydrogen supply quantity reaches a threshold value, the reflux quantity starts to exist, and a characteristic curve of the jet reflux device (1) is formed along with the increase of the gas quantity and the pressure;
secondly, taking the hydrogen supply quantity threshold calibrated in the first step as a maximum rotating speed working point of the electric reflux pump, namely, when the hydrogen quantity is in a working condition before reaching the threshold, the hydrogen quantity is a working section of the electric reflux pump so as to supplement a blank generated when the jet reflux device (1) has no reflux quantity;
thirdly, independently designing the working rotation speed and the characteristic curve of the electric reflux pump according to the hydrogen quantity corresponding to the threshold value calibrated in the second step and the reflux quantity required by the fuel cell (7); forming flow characteristic curves at different rotating speeds of the electric reflux pump;
the fourth step, connect the electric reflux pump and jet reflux device (1) of the characteristic curve calibrated in the third step with fuel cell (7) separately, its working characteristic curve is the characteristic curve superposition of jet reflux device (1) and electric reflux pump; finding a flow value of an electric reflux pump corresponding to a threshold value of the jet reflux device (1), corresponding to the rotating speed of a motor, and taking the value as a constant speed value, wherein the value corresponding to the highest rotating speed of the motor is a reflux starting value of the jet reflux device (1); obtaining a new characteristic curve of the electric reflux pump;
fifthly, fitting a composite working characteristic curve formed by the characteristic curve of the injection reflux device (1) and a new characteristic curve of the electric reflux pump to cover the reflux quantity of the fuel cell (7) from small to large under the complete working condition;
step six, according to the composite working characteristic curve obtained in the step five, hydrogen flows into the fuel cell (7) through the jet reflux device (1) to participate in the reaction, unreacted hydrogen is divided into two paths, one path flows into an air suction port (3) on the jet reflux device through a hydrogen pipeline, and the hydrogen continuously and circularly participates in the reaction; the other path of the hydrogen flows into the electric reflux pump, is discharged from the exhaust port (11) of the electric reflux pump after being compressed, enters the lower air suction port (4) of the jet reflux device, and the hydrogen continues to circulate and participate in the reaction.
2. The method for hydrogen recirculation of fuel cell according to claim 1, wherein the electric recirculation pump in the third step adopts a positive displacement compressor, and the different flow rates are formed by motor speed regulation.
3. A fuel cell hydrogen reflow method in accordance with claim 1, wherein the method is implemented by a fuel cell hydrogen reflow apparatus comprising: a jet reflux device (1), a fuel cell (7), an electric reflux pump; the jet reflux device (1) comprises: an injection reflux inlet (2), an injection reflux upper air suction port (3), an injection reflux lower air suction port (4), an injection reflux outlet (5); the fuel cell (7) is provided with a fuel cell inlet (6) and a fuel cell hydrogen outlet (8); the electric reflux pump consists of an electric reflux pump inlet (9), an electric reflux pump body (10) and an electric reflux pump exhaust port (11); the electric reflux pump and the jet reflux device (1) are connected in series to form a reflux device, wherein an air suction port (3) on the jet reflux device is connected with a branch pipe of a hydrogen outlet (8) of the fuel cell (7); the lower air suction port (4) of the jet reflux device is connected with the air exhaust port (11) of the electric reflux pump, the hydrogen outlet (8) of the fuel cell (7) is connected with the inlet (9) of the electric reflux pump, the inlet (2) of the jet reflux device is connected with a hydrogen source, and the outlet (5) of the jet reflux device is connected with the inlet (6) of the fuel cell; the flow corresponding to the constant rotating speed point of the electric reflux pump is equal to the threshold flow of the jet reflux device (1).
4. A fuel cell hydrogen return method according to claim 1, characterized in that the fuel cell hydrogen outlet (8) has two branches connected to the upper suction port (3) of the jet reflux (1) and to the inlet (9) of the electric return pump, respectively.
5. The method of claim 1, wherein the pump body of the electric reflux pump is a positive displacement compressor, is a reciprocating piston type or a diaphragm type, and the driving motor is a variable frequency motor or a servo motor.
6. A fuel cell hydrogen reflow method in accordance with claim 1, wherein the method is applied in a fuel cell.
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| CN201811057829.XA CN109244507B (en) | 2018-09-11 | 2018-09-11 | Fuel cell hydrogen reflux method |
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| CN201811057829.XA CN109244507B (en) | 2018-09-11 | 2018-09-11 | Fuel cell hydrogen reflux method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007028743A1 (en) * | 2007-06-21 | 2008-04-17 | Daimler Ag | Fuel e.g. hydrogen, cell e.g. polymer electrolyte membrane fuel cell, arrangement, has diffuser provided as ejector to suck reaction product flowing into reefed such as cathode exhaust gas and influx and mix gas in oxidizing agent |
| CN101325267A (en) * | 2007-06-15 | 2008-12-17 | 上海神力科技有限公司 | Method for integrating inner-humidification fuel batter with proton exchange film |
| CN204333123U (en) * | 2015-01-06 | 2015-05-13 | 上海新源动力有限公司 | The reflux in parallel of PEM fuel cell engine hydrogen system |
| CN208806308U (en) * | 2018-09-11 | 2019-04-30 | 大连锐格新能源科技有限公司 | A kind of fuel cell hydrogen reflux unit |
-
2018
- 2018-09-11 CN CN201811057829.XA patent/CN109244507B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101325267A (en) * | 2007-06-15 | 2008-12-17 | 上海神力科技有限公司 | Method for integrating inner-humidification fuel batter with proton exchange film |
| DE102007028743A1 (en) * | 2007-06-21 | 2008-04-17 | Daimler Ag | Fuel e.g. hydrogen, cell e.g. polymer electrolyte membrane fuel cell, arrangement, has diffuser provided as ejector to suck reaction product flowing into reefed such as cathode exhaust gas and influx and mix gas in oxidizing agent |
| CN204333123U (en) * | 2015-01-06 | 2015-05-13 | 上海新源动力有限公司 | The reflux in parallel of PEM fuel cell engine hydrogen system |
| CN208806308U (en) * | 2018-09-11 | 2019-04-30 | 大连锐格新能源科技有限公司 | A kind of fuel cell hydrogen reflux unit |
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