CN113471486B - Integrated hydrogen circulating device for hydrogen fuel cell system - Google Patents
Integrated hydrogen circulating device for hydrogen fuel cell system Download PDFInfo
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- CN113471486B CN113471486B CN202110769403.2A CN202110769403A CN113471486B CN 113471486 B CN113471486 B CN 113471486B CN 202110769403 A CN202110769403 A CN 202110769403A CN 113471486 B CN113471486 B CN 113471486B
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- cell stack
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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
- H01M8/04097—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with recycling of the 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
- H01M8/04119—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying
- H01M8/04156—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying with product water removal
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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
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04313—Processes for controlling fuel cells or fuel cell systems characterised by the detection or assessment of variables; characterised by the detection or assessment of failure or abnormal function
- H01M8/0438—Pressure; Ambient pressure; Flow
- H01M8/04388—Pressure; Ambient pressure; Flow of anode reactants at the inlet or inside the fuel cell
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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
- H01M8/04298—Processes for controlling fuel cells or fuel cell systems
- H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
- H01M8/04746—Pressure; Flow
- H01M8/04753—Pressure; Flow of fuel cell reactants
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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
Abstract
The application discloses an integral type hydrogen circulating device for hydrogen fuel cell system relates to fuel cell technical field. The ejector comprises an ejector part, a mechanical pump part, a gas-liquid separation part and a spring valve part. A first circulating air outlet and a second circulating air outlet of the air-liquid separation part are respectively connected with a circulating air inlet of the ejector part and a circulating air inlet of the mechanical pump part; the outlet of the ejector part is connected with the outlet of the mechanical pump part and then connected with the inlet of the fuel cell stack; a spring valve component for performing stepless switching control on the working states of the ejector component and the mechanical pump component is arranged at the first circulating air outlet; the control unit is used for controlling the mechanical pump component according to the working range of the fuel cell stack and the pressure value fed back by the first pressure sensor arranged at the outlet of the ejector component. The fuel cell stack can stably operate in a wide power variation range.
Description
Technical Field
The present application relates to the field of fuel cell technology, and more particularly, to an integrated hydrogen circulation device for a hydrogen fuel cell system.
Background
The hydrogen fuel cell can directly convert the chemical energy of the hydrogen into electric energy without combustion, has the advantages of high efficiency and power density, zero emission and silent operation, and is a new energy power generation power device with great prospect. In order to ensure the high-efficiency operation of the fuel cell, the hydrogen supply amount on the anode side is greater than the amount of the reacted hydrogen, so that an anode hydrogen circulation system needs to be established to recycle the unconsumed hydrogen again so as to improve the utilization rate of the hydrogen.
In a hydrogen circulation system of a hydrogen fuel cell vehicle, a mechanical pump or an ejector is generally used as a device for hydrogen circulation. In practical applications, the power of fuel cell vehicles is constantly changing, which requires that the hydrogen circulation device can provide a stable circulation capability over a wide power range. The mechanical pump is a device which uses electric energy to drive work, can meet the hydrogen circulation requirement under different electric pile working conditions by adjusting the rotating speed of the motor, but has higher cost and poorer reliability. Compared with a mechanical pump, the ejector does not consume electric energy, and meanwhile, the ejector is simple in structure, high in reliability and low in cost, but is difficult to adapt to a wide power range.
Therefore, the ejector and the mechanical pump are jointly used in the existing literature, the respective advantages of the ejector and the mechanical pump are combined, the power consumption of the whole system is reduced, and the system efficiency is improved. However, in both the series scheme and the parallel scheme, the mechanical switching valve is used for switching the working states of the ejector and the mechanical pump, so that the control of the system becomes more complicated, and meanwhile, because the working modes and the performances of the ejector part and the mechanical pump part are obviously different, the ejector part and the mechanical pump part cause the fluctuation of the circulation performance of the system during instantaneous switching, and the influence is generated on the performance and the service life of the pile.
Disclosure of Invention
The application provides an integral type hydrogen circulating device for hydrogen fuel cell system combines ejector part, mechanical pump part and water separator part to utilize the spring valve part to realize the stepless control to ejector part and mechanical pump part operating condition, furthest's reduction mechanical power consumption, make fuel cell pile can stabilize economic operation in the power variation range of broad.
To achieve the above object, the present application provides an integrated hydrogen circulation device for a hydrogen fuel cell system, comprising an ejector member, a mechanical pump member, a spring valve member, a gas-liquid separation member, a first pressure sensor, and a control unit, wherein:
the circulating gas inlet of the gas-liquid separation part is used for introducing gas discharged from the outlet of the fuel cell stack into the gas-liquid separation part; the first circulating air outlet and the second circulating air outlet of the air-liquid separation part are respectively connected with the circulating air inlet of the ejector part and the circulating air inlet of the mechanical pump part; the outlet of the ejector part is connected with the outlet of the mechanical pump part and then connected with the inlet of the fuel cell stack; a spring valve component for performing stepless switching control on the working states of the ejector component and the mechanical pump component is arranged at the first circulating air outlet;
the first pressure sensor is used for measuring the pressure value at the outlet of the ejector part;
the control unit is configured to: and controlling the mechanical pump part according to the working range of the fuel cell stack and the pressure value fed back by the first pressure sensor, so that the pressure value at the outlet of the ejector part is equal to the pressure value required by the inlet of the fuel cell stack.
Further, the spring valve member can automatically control the opening degree according to the change of the pumped circulation air flow.
Further, a hydrogen injection valve for supplying high-pressure hydrogen is provided at a high-pressure hydrogen inlet of the ejector member.
The working interval is divided into a high-power interval, a medium-power interval and a low-power interval according to the injection performance of the injector part;
when the injection performance of the injector part completely meets the requirement of the fuel cell stack, the fuel cell stack is in a high-power interval; when the injection performance of the injector part cannot meet the requirement of the fuel cell stack, the fuel cell stack is in a medium power range; when the ejector performance of the ejector component is reduced to complete failure, the fuel cell stack is in a low power region.
Further, the control unit is configured to: and judging the current working interval of the fuel cell stack, and if the fuel cell stack works in a medium-power interval or a low-power interval, controlling the opening and closing and the rotating speed of the mechanical pump component according to the pressure value fed back by the first pressure sensor to enable the pressure value at the outlet of the ejector component to be equal to the pressure value required by the inlet of the fuel cell stack.
Furthermore, when the fuel cell stack is in a high-power section, the mechanical pump part is in a closed state, and the ejector part works alone to pump circulating air;
when the fuel cell stack is in a middle power range, the mechanical pump part and the ejector part work simultaneously to pump circulating gas;
the mechanical pump assembly operates alone to pump the circulating gas when the fuel cell stack is in a low power range.
Further, the gas-liquid separation part and the mechanical pump part are positioned on the same side of the ejector part.
The ejector component is used for injecting high-pressure hydrogen into the circulating gas inlet of the gas-liquid separation component, and the circulating gas inlet of the gas-liquid separation component is used for introducing circulating gas into the circulating gas inlet of the gas-liquid separation component.
Compared with the prior art, the application has the following beneficial effects: the ejector component and the mechanical pump component are used in a combined mode, stepless switching is carried out through the spring valve component, and meanwhile the water separation function is combined, so that the device is stable and reliable; the hydrogen circulating device can be divided into three-level work according to the working states of the ejector component and the mechanical pump component, and comprises a high-power section only using the ejector component, a medium-power section combined with the ejector component and a low-power section only using the mechanical pump component. The mechanical pump part is controlled to be opened and closed and the rotating speed is controlled by monitoring the outlet pressure value of the ejector part, the three intervals are switched automatically according to the characteristics of the spring valve part, the mechanical switch valve is not needed to be used for electric control switching, the problem of performance fluctuation generated during switching is solved, and the system control is simpler. The whole device can cover a wider power interval of the electric pile, does not generate performance fluctuation when the working state is switched, and improves the performance and the service life of a fuel cell system.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an integrated hydrogen circulation device;
FIG. 2 is a schematic diagram of a fuel cell hydrogen supply system;
FIG. 3 is a schematic diagram of the operation of the hydrogen circulation device in a high power range;
FIG. 4 is a schematic view of the operation of the hydrogen circulation device in a medium power range;
FIG. 5 is a schematic diagram of the operation of the hydrogen circulation device in a low power region;
fig. 6 is a schematic control diagram of the hydrogen circulation device.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present application.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the specific meaning of the above terms in this application will be understood to be a specific case for those of ordinary skill in the art.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
Example 1: referring to fig. 1, an integrated hydrogen circulation device for a hydrogen fuel cell system according to an embodiment of the present disclosure mainly includes an ejector component 1, a gas-liquid separation component 3, a mechanical pump component 2, a first pressure sensor 602, a second pressure sensor 601, a third pressure sensor 603, and a control unit, where the gas-liquid separation component 3 and the mechanical pump component 2 are located on the same side of the ejector component 1.
A hydrogen injection valve 5 for supplying high-pressure hydrogen is provided at the high-pressure hydrogen inlet 702 of the injector part 1.
The circulation gas inlet 706 of the gas-liquid separation section 3 is for introducing the gas discharged from the outlet 142 of the fuel cell stack into the gas-liquid separation section 3; a first circulating air outlet and a second circulating air outlet of the gas-liquid separation part 3 are respectively connected with a circulating air inlet 703 of the ejector part and a circulating air inlet 704 of the mechanical pump part; the outlet 707 of the eductor part is connected to the outlet 705 of the mechanical pump part and then to the inlet 141 of the fuel cell stack. And a spring valve part 4 for automatically controlling the opening according to the change of the circulating air flow pumped by the ejector part 1 is arranged at the first circulating air outlet.
The first pressure sensor 602, the second pressure sensor 601 and the third pressure sensor 603 are used to measure the pressure values at the outlet 707 of the eductor part, the high-pressure hydrogen inlet 702 of the eductor part and the recycle gas inlet 706 of the gas-liquid separation part, respectively.
The control unit is configured to: and controlling the mechanical pump part 2 according to the working range of the fuel cell stack 14 and the pressure value fed back by the first pressure sensor 602, so that the pressure value at the outlet 707 of the ejector part is equal to the required pressure value at the inlet 141 of the fuel cell stack, namely the sum of the circulating air flow pumped by the mechanical pump part 2, the high-pressure hydrogen flow delivered by the ejector part 1 and the pumped high-pressure hydrogen flow is equal to the required flow of the fuel cell stack 14.
The operating range of the fuel cell stack 14 is divided into a high power range, a medium power range and a low power range according to the injection performance of the injector part; wherein, the circulating gas is automatically pumped by utilizing the ejector part in a high-power interval; pumping circulating air simultaneously by using a mechanical pump part and an ejector part in a medium-power interval; the circulating gas is pumped with a mechanical pump at low power intervals.
The control unit comprises the following specific operation steps: and judging the current working range of the fuel cell stack 14, and if the fuel cell stack 14 works in a medium-power range or a low-power range, controlling the opening, closing and rotating speed of the mechanical pump part according to the pressure value fed back by the first pressure sensor to enable the pressure value at the outlet of the ejector part to be equal to the pressure value required by the inlet of the fuel cell stack.
Referring to fig. 2, the fuel cell hydrogen supply system includes a high-pressure hydrogen cylinder 11, a cut-off safety valve 12, a pressure reducing valve 13, a hydrogen circulation device, and a fuel cell stack 14, which are connected in sequence. The structure and connection of the hydrogen circulation device are shown in fig. 1, and will not be described in detail.
The high-pressure hydrogen gas stored in the high-pressure hydrogen cylinder 11 is used as fuel of the fuel cell stack 14, and after passing through the stop safety valve 12 and the pressure reducing valve 13, the high-pressure hydrogen gas is supplied to the ejector component 1 through the inlet 701 of the hydrogen injection valve, and then enters the fuel cell stack 14 through the outlet 707 of the ejector component for reaction. The hydrogen electrochemically reacts with the oxygen at the cathode side in the fuel cell stack 14 to generate electric energy, and the unconsumed hydrogen is discharged from the stack together with the generated liquid water and water vapor to generate the circulating gas to be circulated.
The circulating gas is discharged from the outlet 142 of the fuel cell stack into the gas-liquid separation part 3, is mixed with hydrogen gas having a certain pressure value by pumping of the ejector part 1 or the mechanical pump part 2 after water separation and pressurization, and then enters the inlet 141 of the fuel cell stack through the outlet 707 of the ejector part.
Referring to fig. 3 to 6, the working process and control mode of embodiment 1 of the present application are as follows:
the operation range of the fuel cell stack 14 is three, including a high power range, a middle power range, and a low power range, and thus, the operation of the hydrogen circulation device can be divided into three states.
Referring to fig. 3, at this time, because the hydrogen consumption of the fuel cell stack 14 is very high, the hydrogen injector component 1 has high injection performance due to the high-pressure flow of hydrogen ejected by the hydrogen ejection valve 5, the fuel cell stack 14 works in a high-power region, and the injection capacity of the injector component 1 completely meets the hydrogen circulation requirement. Under the injection action of the injector part 1, low pressure is generated at the position of the circulating gas inlet 703 of the injector part (namely, the outlet position of the spring valve part 4), and under the action of the pressure difference between two sides of the valve sheet of the spring valve part 4, the valve sheet is completely opened, and circulating gas only passes through the circulating gas inlet 703 of the injector part. At this point the pressure at the outlet 707 of the eductor part meets the pressure value at the stack inlet 141 and the mechanical pump part 2 is in a closed state.
Referring to fig. 4, the consumption of hydrogen is reduced, the injection capacity of the injector component 1 is also reduced, and the fuel cell stack 14 works in a medium power range, at this time, the injection capacity of the injector component 1 cannot meet the requirement of the fuel cell stack 14. When the injection capacity of the injector part 1 is insufficient, the opening degree of the spring valve part 4 is reduced. At this time, the pressure value fed back by the first pressure sensor 602 is smaller than the pressure value required at the inlet 141 of the fuel cell stack, and the control unit turns on the mechanical pump part 2 and adjusts the rotation speed of the mechanical pump part 2 according to the pressure value fed back by the first pressure sensor 602. A portion of the circulating air flow is pumped by the mechanical pump assembly 2 such that the total flow pumped by the eductor assembly 1 and the mechanical pump assembly 2 is equal to the required flow of the fuel cell stack 14, even though the pressure value at the outlet 707 of the eductor assembly measured by the pressure sensor 602 is equal to the required pressure value at the inlet 141 of the fuel cell stack. In this state, the ejector component 1 and the mechanical pump component 2 both bear circulation, and as the power of the galvanic pile is reduced, the rotating speed of the mechanical pump component 2 is increased, and the amount of circulating hydrogen borne by the mechanical pump component 2 is increased. The spring valve part 4 automatically adjusts the amount of circulating hydrogen passing through the ejector part 1 through the valve opening in the power interval, has the capacity of automatically balancing pressure loss and flow, and can enable the ejection capacity of the ejector part 1 to be matched with the hydrogen circulation requirement of the fuel cell stack 14.
Referring to fig. 5, the ejector component 1 loses the ejector function, the fuel cell stack 14 operates in a low-power region, the pressure at the circulating air inlet 703 of the ejector component is higher than the pressure at the circulating air inlet 704 of the mechanical pump component, the spring valve 4 is closed under the action of the pressure difference, and at this time, the ejector component 1 cannot pump the circulating air. All the circulating air is supplied by the mechanical pump unit 2, and the pressure value fed back by the first pressure sensor 602 is smaller than the pressure value required at the inlet 141 of the fuel cell stack, and therefore, the control unit turns on the mechanical pump unit 2 and adjusts the rotation speed of the mechanical pump unit 2 so that the pressure value thereof is equal to the pressure value required at the inlet 141 of the fuel cell stack, based on the pressure value fed back by the first pressure sensor 602.
In summary, two key stack power values H and L are set for operation of the hydrogen circulation device as shown in FIGS. 3-5. When the power of the galvanic pile is higher than the H value, the injection performance of the injector part completely meets the requirement of the fuel cell pile, and the fuel cell pile 14 works in a high-power interval, at the moment, the circulating gas passing through the gas-liquid separation part 3 is pumped by the injector part 1; when the power of the galvanic pile is lower than the H value and is higher than the L value, the injection performance of the injector part cannot meet the requirement of the fuel cell pile, the device works in a medium power range, and at the moment, circulating air is pumped by the injector part 1 and the mechanical pump part 2 together; when the power of the galvanic pile is lower than the L value, the injection performance of the injector part is reduced to be completely ineffective, the device works in a low-power region, and at the moment, the circulating air is pumped only through the mechanical pump part 2. Meanwhile, the adjustment between the three working intervals is realized only by controlling the opening of the mechanical pump part 2 and adjusting the rotating speed, and the electric control switching between the mechanical switching valves is not needed, namely the ejector part 1 and the mechanical pump 2 are subjected to stepless switching control, so that the problem of performance fluctuation does not exist during adjustment, and the performance stability of the device can be kept.
Referring to fig. 6, the power values H and L are determined according to the relationship between the hydrogen circulation required by the fuel cell stack 14 and the hydrogen circulation that can be provided by the ejector assembly 1. The intersection point of the stack demand line and the ejector component line is a high-power point H, when the stack power is higher than H, the ejector component performance line is higher than the stack demand line, and at the moment, the performance of the ejector component 1 can meet the 14 requirements of the fuel cell stack. When the pile power is less than H, ejector part performance line is less than pile demand line, and ejector part 1 performance can not satisfy the pile demand this moment, consequently opens 2 pumps of machinery and makes up the difference of the circulating hydrogen volume between pile demand and the ejector part 1. The intersection point of the ejector part line and the transverse shaft is a low-power L point, the ejector part loses performance when the power of the galvanic pile is lower than an L value, all circulating air is supplied by the mechanical pump part 2, at the moment, the mechanical pump part 2 bears all circulating hydrogen, and the rotating speed of the mechanical pump part 2 is controlled to enable the inlet pressure of the galvanic pile to maintain a required value.
The above is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (6)
1. An integrated hydrogen circulation device for a hydrogen fuel cell system, comprising an ejector member, a mechanical pump member, a spring valve member, a gas-liquid separation member, a first pressure sensor, and a control unit, wherein: the gas-liquid separation part is used for introducing gas discharged from an outlet of the fuel cell stack into the gas-liquid separation part; the first circulating air outlet and the second circulating air outlet of the air-liquid separation part are respectively connected with the circulating air inlet of the ejector part and the circulating air inlet of the mechanical pump part; the outlet of the ejector part is connected with the inlet of the fuel cell stack, and the outlet of the mechanical pump part is connected between the outlet of the ejector part and the circulating air inlet of the ejector part; a spring valve component for performing stepless switching control on the working states of the ejector component and the mechanical pump component is arranged at the first circulating air outlet; the first pressure sensor is used for measuring the pressure value at the outlet of the ejector part; the control unit is configured to: controlling a mechanical pump component according to the working range of the fuel cell stack and the pressure value fed back by the first pressure sensor, so that the pressure value at the outlet of the ejector component is equal to the pressure value required by the inlet of the fuel cell stack; the second pressure sensor and the third pressure sensor are respectively used for measuring the pressure at the high-pressure hydrogen inlet of the ejector component and the pressure at the circulating gas inlet of the gas-liquid separation component;
the working interval is divided into a high-power interval, a medium-power interval and a low-power interval according to the injection performance of the injector part; when the fuel cell stack is in a high-power section, the mechanical pump part is in a closed state, and the ejector part works alone to pump circulating air; when the fuel cell stack is in a middle power range, the mechanical pump part and the ejector part work simultaneously to pump circulating gas; the mechanical pump components are operated alone to pump the circulating gas when the fuel cell stack is in a low power range.
2. The integrated hydrogen circulation device for a hydrogen fuel cell system according to claim 1, wherein the opening degree of the spring valve member is automatically controlled according to the change in the circulation gas flow rate pumped by the ejector member.
3. An integrated hydrogen circulation device for a hydrogen fuel cell system according to claim 2, wherein a hydrogen injection valve for supplying high-pressure hydrogen gas is provided at the high-pressure hydrogen gas inlet of the ejector member.
4. The integrated hydrogen circulation device for a hydrogen fuel cell system according to claim 1, wherein when the ejector performance of the ejector member fully satisfies the fuel cell stack requirement, the fuel cell stack is in a high power region; when the injection performance of the injector part cannot meet the requirement of the fuel cell stack, the fuel cell stack is in a medium power range; when the ejector performance of the ejector component is reduced to complete failure, the fuel cell stack is in a low power region.
5. An integrated hydrogen circulation device for a hydrogen fuel cell system according to claim 4, wherein the control unit is configured to: and judging the current working range of the fuel cell stack, and if the fuel cell stack works in a medium-power range or a low-power range, controlling the opening, closing and rotating speed of the mechanical pump part according to the pressure value fed back by the first pressure sensor to enable the pressure value at the outlet of the ejector part to be equal to the pressure value required by the inlet of the fuel cell stack.
6. An integrated hydrogen circulation device for a hydrogen fuel cell system according to claim 3, wherein the gas-liquid separation part and the mechanical pump part are on the same side of the ejector part.
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| CN114284528A (en) * | 2021-11-18 | 2022-04-05 | 北京格睿能源科技有限公司 | Fuel cell hydrogen circulation system and control method thereof |
| CN114725453A (en) * | 2022-03-31 | 2022-07-08 | 西安交通大学 | Gas-water separator for fuel cell, hydrogen supply system and method for regulating and controlling nitrogen concentration |
| CN114452724B (en) * | 2022-04-11 | 2022-07-15 | 中山大洋电机股份有限公司 | Steam-water separator and fuel cell system thereof |
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| US6800390B2 (en) * | 2001-03-23 | 2004-10-05 | Nissan Motor Co., Ltd. | Fuel cell power plant |
| CN102938467A (en) * | 2012-11-17 | 2013-02-20 | 新源动力股份有限公司 | Fuel cell positive pole system |
| CN110247083B (en) * | 2019-07-18 | 2023-08-01 | 中山大洋电机股份有限公司 | Fuel cell hydrogen supply system and fuel cell system using same |
| CN212485377U (en) * | 2020-07-06 | 2021-02-05 | 无锡沃尔福汽车技术有限公司 | Fuel cell hydrogen circulation system |
| CN112864420B (en) * | 2021-03-15 | 2021-08-31 | 烟台东德实业有限公司 | Hydrogen supply system of fuel cell integrated by parallel connection of hydrogen circulating pump and ejector |
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