CN212303726U - Circulating water pressure control system of fuel cell test platform - Google Patents
Circulating water pressure control system of fuel cell test platform Download PDFInfo
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- CN212303726U CN212303726U CN202021302902.8U CN202021302902U CN212303726U CN 212303726 U CN212303726 U CN 212303726U CN 202021302902 U CN202021302902 U CN 202021302902U CN 212303726 U CN212303726 U CN 212303726U
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/30—Hydrogen technology
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Abstract
The utility model provides a fuel cell test platform circulating water pressure control system, include: the air inlet arranged on the liquid storage container is communicated with the auxiliary air through the pressure control unit; the pressure control unit is used for controlling the on-off of an air inlet channel and an air outlet channel of the liquid storage container according to an instruction issued by the control unit; one end of the liquid circulation unit is connected with the water outlet of the liquid storage container, and the other end of the liquid circulation unit is connected with the water inlet of the fuel cell stack; the first pressure feedback unit is connected to a pipeline before the water inlet of the fuel cell stack and used for feeding back the pressure at the water inlet of the fuel cell stack; and the control unit is connected with the pressure control unit, the liquid circulation unit and the first pressure feedback unit and controls the pressure control unit to act according to the pressure value acquired by the first pressure feedback unit. The utility model discloses simple structure, operation precision height and low cost.
Description
Technical Field
The utility model relates to a fuel cell tests the field, particularly, especially relates to a fuel cell test platform circulating water pressure control system.
Background
Hydrogen fuel cells have become an important component of new energy sources as a new clean energy source capable of directly converting chemical energy into electrical energy. Today, the hydrogen energy industry is rapidly developed, a large amount of manpower and material resources are required to be input in the research and development production of high-power and high-stability electric piles, and scientific research and development layout is also required to be carried out on corresponding detection systems and supporting equipment. When the fuel cell stack test bench is used for testing the high-load operation of the stack, the circulating water pressure needs to change along with the gas pressure, and the pressure response is the premise of normal operation of the stack. The irreversible damage can be caused to the polar plate if the circulating water pressure of the cooling liquid of the galvanic pile is out of control. Because the electrode plates of the galvanic pile are different in material types, the requirements on steam-water pressure difference are different. The graphite electrode plate generally requires that the steam-water pressure difference cannot exceed 50KPA, and in the early stage test of the development of the galvanic pile, in order to measure the best performance of the galvanic pile, the galvanic pile is protected well, and even the steam-water pressure difference cannot exceed 20 KPA.
The existing fuel galvanic pile test platform does not consider a circulating water pressure control scheme, a water tank in a circulating water path structure cannot bear pressure, and the inlet and outlet pressure of a galvanic pile is realized passively by completely depending on the flow rate of circulating water, the resistance of the galvanic pile and the drift diameter of a pipeline. When the graphite galvanic pile is tested, the galvanic pile can be damaged irreversibly due to overlarge steam-water pressure difference, and a ball valve can only be added at the outlet of the galvanic pile for reducing the steam-water pressure difference, and pressure regulation is manually realized by changing the opening of the ball valve. The voltage regulating method needs to be matched by a plurality of persons in the test process, and has low precision and poor timeliness.
Chinese patent publication No. CN 109585880 discloses a control scheme commonly used in fuel cell testing platforms, in which a circulating water path has no pressure control function and is only used for passively detecting the pressure entering the fuel cell stack.
The known device and system can not meet the pressure control requirement of the fuel cell, and in order to better evaluate the fuel cell stack product, a more complete circulating water pressure control system of a fuel cell stack test bench needs to be developed.
Disclosure of Invention
According to the problem that the existing device and system cannot meet the pressure control requirement of the fuel cell, the circulating water pressure control system of the fuel cell test platform is provided. The invention can accurately control the pressure of the circulating waterway of the galvanic pile and can adapt to more types of galvanic piles.
The technical means adopted by the invention are as follows:
a fuel cell test platform circulating water pressure control system comprising:
the air inlet arranged on the liquid storage container is communicated with the auxiliary air through the pressure control unit;
the pressure control unit is used for controlling the on-off of an air inlet channel and an air outlet channel of the liquid storage container according to an instruction issued by the control unit;
one end of the liquid circulation unit is connected with the water outlet of the liquid storage container, and the other end of the liquid circulation unit is connected with the water inlet of the fuel cell stack;
the first pressure feedback unit is connected to a pipeline before the water inlet of the fuel cell stack and used for feeding back the pressure at the water inlet of the fuel cell stack;
and the control unit is connected with the pressure control unit, the liquid circulation unit and the first pressure feedback unit and controls the pressure control unit to act according to the pressure value acquired by the first pressure feedback unit.
Further, the system further comprises:
the second pressure feedback unit is connected to the liquid storage container and used for feeding back the internal pressure of the liquid storage container;
and the third pressure feedback unit is connected to the pipeline behind the water outlet of the fuel cell stack and is used for feeding back the pressure at the water outlet of the fuel cell stack.
Further, the system further comprises: and one end of the pressure protection unit is connected with the pile feeding pipeline behind the liquid circulating device, and the other end of the pressure protection unit is connected with the water return port of the liquid storage container.
Further, a pressure relief unit is connected to the liquid storage container.
Further, the liquid storage container is a sealed stainless steel tank.
Compared with the prior art, the invention has the following advantages:
the utility model discloses a fuel cell test platform circulating water pressure control system has realized fuel cell test platform to the accurate control of circulating water path pressure. The pressure control precision of the circulating water of the fuel cell test platform can reach within 0.01BAR, and the response time is within 10 seconds. The system is applied to the fuel cell test board, can control the pressure of circulating water in the test process, and has the advantages of accurate pressure control, simple pipe distribution, convenient control and low cost.
Based on the reason, the utility model discloses can extensively promote in fuel cell test field.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a circulating water pressure control system of a fuel cell testing platform in an embodiment.
In the figure: 1. a reservoir; 2. a pressure control unit; 3. a pressure relief unit; 4. a liquid circulation unit; 5. a first pressure feedback unit; 6. a second pressure feedback unit; 7. a third pressure feedback unit; 8. a pressure protection unit; 9. a control unit.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the field of evaluation and test of fuel cell stack performance, when the stack working condition is tested, not only the reactant and the temperature and humidity conditions need to be accurately controlled and managed, but also the pressure of the reactant and the cooling liquid needs to be controlled. In order to realize the accurate control of galvanic pile cooling fluid pressure, the utility model provides a fuel cell test platform circulating water pressure control system, as shown in FIG. 1, the system mainly includes stock solution container 1, pressure control unit 2, liquid circulation unit 4, first pressure feedback unit 5 and the control unit 9.
The liquid storage container 1 is provided with an air inlet, an air outlet, a water outlet and a water return port. The air inlet is connected with an air inlet pipeline, and the air inlet pipeline is communicated with an air outlet of the auxiliary air conveying device. And the exhaust port is connected with an exhaust pipeline, and the exhaust pipeline is communicated with the return port of the auxiliary gas conveying device. The water outlet is connected with the water inlet pipeline of the fuel cell stack. The water return port is connected with a water outlet pipeline of the fuel cell stack. In addition, the liquid storage container 1 is also provided with a pressure relief opening, and the pressure relief opening is connected with the pressure relief unit 3 through a pressure relief pipeline. When the pressure in the liquid storage container 1 exceeds a threshold value, the pressure is reduced by exhausting gas through the pressure relief unit 3. Further preferably, the liquid storage container is a pressure-bearing sealed stainless steel tank.
Further, the pressure control unit 2 is mainly used for controlling the on-off of an air inlet channel and an air outlet channel of the liquid storage container 1 according to an instruction issued by the control unit 9. When the control unit 9 judges that the pressure of the fuel cell stack inlet needs to be increased during testing of the stack, the pressure control unit 1 is controlled to open the air inlet channel, air is delivered into the liquid storage container 1, the pressure in the liquid storage container 1 is increased, and when the pressure of the fuel cell stack inlet reaches a set value, the control unit 9 controls the pressure control unit 1 to stop air supply. When the control unit 9 judges that the inlet pressure of the fuel cell stack needs to be reduced, the control pressure control unit 2 is controlled to open the exhaust channel to exhaust the gas in the liquid storage container, and when the inlet pressure of the fuel cell stack is reduced to a set value, the control unit 9 controls the pressure control unit 2 to stop exhausting. The invention realizes the active control of the pressure of the circulating water path by adjusting the gas mode.
Further, the system of the present invention comprises a second pressure feedback unit 6 and a third pressure feedback unit 7 in addition to the first pressure feedback unit 5. The first pressure feedback unit 5 is connected to a pipeline before the water inlet of the fuel cell stack and used for feeding back the pressure at the water inlet of the fuel cell stack. The second pressure feedback unit 6 is connected to the liquid storage container and used for feeding back the internal pressure of the liquid storage container. The third pressure feedback unit 7 is connected to the pipeline behind the water outlet of the fuel cell stack and used for feeding back the pressure at the water outlet of the fuel cell stack.
Further, one end of the liquid circulation unit 4 is connected with the water outlet of the liquid storage container, and the other end is connected with the water inlet of the fuel cell stack. The control unit 9 adjusts the power of the liquid circulation unit 4 according to the test requirements, and then controls the circulation water flow. Further preferably, the liquid circulation unit 4 adopts a circulating water pump, and when the circulating water is passively circulated to respond to the pressure, an active control pneumatic proportional valve is added to adjust the pressure. The pressure control system not only can accurately control the water pressure of the feed pile, but also can efficiently respond in time.
In addition, the system also comprises a pressure protection unit 8, one end of the pressure protection unit is connected with the pile feeding pipeline behind the liquid circulation device, and the other end of the pressure protection unit is connected with a water return port of the liquid storage container. When pressure is abnormal after the pump, the pressure protection unit can be automatically opened, and circulating water returns to the liquid storage container. In general, the pressure abnormality refers to the fact that the pressure exceeds the design value of the pressure protection unit 8, and most of the conditions are caused by abnormal flow channels or blocked pipelines in the electric pile.
The control unit 9 is in signal connection with the pressure control unit 2, the liquid circulation unit 4, the first pressure feedback unit 5, the second pressure feedback unit 6, the third pressure feedback unit 7 and other functional modules, and is mainly used for controlling the pressure control unit 2 to act according to the pressure value collected by the first pressure feedback unit 5. Specifically, the control unit 9 is the brain of the whole test platform, receives signals from the pressure feedback units and the like, and controls the operation of the functional devices such as the pressure control unit 2 and the like. For example, the pressure relief unit is controlled to release part of the gas in the liquid storage container 1 according to the pressure value fed back by the second pressure feedback unit 6, or the pressure protection unit 8 is controlled to guide the cooling water back to the inside of the liquid storage container 1 according to the pressure values fed back by the second pressure feedback unit 6 and the third pressure feedback unit 7.
The working process of the system is further explained by specific application examples. Fig. 1 shows the structure of the circulating water pressure control system of the fuel cell test bench. The first pressure feedback unit, the second pressure feedback unit and the third pressure feedback unit feed back AI signals, the control unit performs program control by reading input AI signals and control target logic, when a target value is larger than the first pressure feedback unit 5, the test board system needs to be boosted, when the control unit receives a circulating water pile inlet boosting instruction, the circulating water pile inlet boosting instruction is converted into a specific execution target value according to the difference value between the target value and the first pressure feedback unit 5, the pressure control unit 2 is controlled to work according to scientific control logic and an algorithm, an air inlet channel is opened, and auxiliary gas enters the liquid storage container 1 through the pressure control unit 2. The pressure of a second pressure feedback unit 6 in the liquid storage container 1 is increased, the pressure of a third pressure feedback unit 7 at the outlet of the galvanic pile is increased, and the control unit compares feedback values of the pressure feedback units in real time. When the control unit 9 detects that the first pressure feedback unit 5 reaches the target, the pressure control unit 2 is controlled to stop the intake of air. When the target value is smaller than the first pressure feedback unit 5, the test board system needs to reduce the pressure, when a circulating water pressure reduction instruction is received, the control unit 9 can convert the target value into a specific execution target value according to the difference value between the target value and the first pressure feedback unit 5, and controls the pressure control unit 2 to exhaust according to scientific control logic and algorithms, gas in the liquid storage container 1 is exhausted, the second pressure feedback unit 6 arranged in the liquid storage container 1 detects the pressure reduction, the third pressure feedback unit 7 arranged at the outlet of the electric pile also reduces accordingly, and when the first pressure feedback unit 5 reaches the target, the control unit 9 can control the pressure control unit 2 to stop exhausting. The circulating waterway liquid circulating device 4 is provided with a pressure protection unit 8, when the pressure after the pump exceeds a protection value, the pressure protection unit 8 is automatically opened, and the circulating water directly returns to the liquid storage container 1 through a large pipe diameter. The top end of the liquid storage container 1 is provided with a pressure relief unit 3, and when the pressure in the liquid storage container 1 reaches a pressure relief value, the pressure relief unit 3 on the liquid storage container 1 can automatically open for air exhaust.
The specific use steps of the system comprise:
step 1, starting all functional units of the system, and controlling the power of the liquid circulation unit by a control unit according to use requirements so as to control the circulation water flow.
And 2, acquiring the required pressure of the water inlet of the fuel cell stack by the control unit.
And 3, extracting the actual pressure at the water inlet of the fuel cell stack by the first pressure feedback unit, and sending the actual pressure to the control unit. Further, the control unit controls the pressure protection unit to be opened when the pressure value extracted by the first pressure feedback unit is abnormal, and water in a pipeline behind the liquid circulation unit is guided to flow back into the liquid storage container. And further, the pressure in the liquid storage container is obtained in real time through the second pressure feedback unit, and when the pressure value is larger than a set threshold value, the control unit controls the pressure relief unit to open to release the gas in the liquid storage container.
And 4, the control unit sends a control instruction to the pressure control unit according to the difference value between the required pressure and the actual pressure so as to control the on-off of the air inlet channel and the exhaust channel. The method specifically comprises the following steps: when the actual pressure is lower than the required pressure, the pressure control unit opens the air inlet channel and conveys air into the liquid storage container, and the air inlet channel is closed until the actual pressure is equal to the required pressure; when the actual pressure is larger than the required pressure, the pressure control unit opens the air inlet channel to discharge the gas in the liquid storage container, and the air outlet channel is closed until the actual pressure is equal to the required pressure.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (5)
1. The utility model provides a fuel cell test platform circulating water pressure control system which characterized in that includes:
the air inlet arranged on the liquid storage container is communicated with the auxiliary air through the pressure control unit;
the pressure control unit is used for controlling the on-off of an air inlet channel and an air outlet channel of the liquid storage container according to an instruction issued by the control unit;
one end of the liquid circulation unit is connected with the water outlet of the liquid storage container, and the other end of the liquid circulation unit is connected with the water inlet of the fuel cell stack;
the first pressure feedback unit is connected to a pipeline before the water inlet of the fuel cell stack and used for feeding back the pressure at the water inlet of the fuel cell stack;
and the control unit is connected with the pressure control unit, the liquid circulation unit and the first pressure feedback unit and controls the pressure control unit to act according to the pressure value acquired by the first pressure feedback unit.
2. The fuel cell test platform circulating water pressure control system of claim 1, further comprising:
the second pressure feedback unit is connected to the liquid storage container and used for feeding back the internal pressure of the liquid storage container;
and the third pressure feedback unit is connected to the pipeline behind the water outlet of the fuel cell stack and is used for feeding back the pressure at the water outlet of the fuel cell stack.
3. The fuel cell test platform circulating water pressure control system of claim 1, further comprising a pressure protection unit, one end of the pressure protection unit is connected to the pile feeding pipeline behind the liquid circulating device, and the other end of the pressure protection unit is connected to the water return port of the liquid storage container.
4. The fuel cell test platform circulating water pressure control system of claim 1, wherein a pressure relief unit is connected to the reservoir.
5. The fuel cell test platform circulating water pressure control system of any one of claims 1-4, wherein the reservoir is a sealed stainless steel tank.
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| CN202021302902.8U CN212303726U (en) | 2020-07-06 | 2020-07-06 | Circulating water pressure control system of fuel cell test platform |
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| CN202021302902.8U CN212303726U (en) | 2020-07-06 | 2020-07-06 | Circulating water pressure control system of fuel cell test platform |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111653808A (en) * | 2020-07-06 | 2020-09-11 | 大连擎研科技有限公司 | Circulating water pressure control system of fuel cell test platform and use method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111653808A (en) * | 2020-07-06 | 2020-09-11 | 大连擎研科技有限公司 | Circulating water pressure control system of fuel cell test platform and use method thereof |
| CN111653808B (en) * | 2020-07-06 | 2024-06-25 | 大连擎研科技有限公司 | Circulating water pressure control system of fuel cell test platform and application method thereof |
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