CN116826114A - Secondary heat exchange water temperature control device for fuel cell and control method thereof - Google Patents
Secondary heat exchange water temperature control device for fuel cell and control method thereof Download PDFInfo
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- CN116826114A CN116826114A CN202311063873.2A CN202311063873A CN116826114A CN 116826114 A CN116826114 A CN 116826114A CN 202311063873 A CN202311063873 A CN 202311063873A CN 116826114 A CN116826114 A CN 116826114A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 106
- 239000000446 fuel Substances 0.000 title claims abstract description 10
- 238000000034 method Methods 0.000 title claims abstract description 9
- 239000000110 cooling liquid Substances 0.000 claims abstract description 74
- 239000007788 liquid Substances 0.000 claims abstract description 57
- 238000001816 cooling Methods 0.000 claims abstract description 40
- 230000007613 environmental effect Effects 0.000 claims abstract description 24
- 238000011084 recovery Methods 0.000 claims abstract description 24
- 238000012360 testing method Methods 0.000 claims abstract description 19
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 24
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 12
- 239000002826 coolant Substances 0.000 claims description 8
- 239000008367 deionised water Substances 0.000 claims description 8
- 229910021641 deionized water Inorganic materials 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 3
- 238000007872 degassing Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 2
- 231100000331 toxic Toxicity 0.000 abstract description 4
- 230000002588 toxic effect Effects 0.000 abstract description 4
- 238000004064 recycling Methods 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 description 8
- 239000007789 gas Substances 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- H01M8/0432—Temperature; Ambient temperature
-
- 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
- H01M8/04007—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
-
- 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
- H01M8/04007—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids related to heat exchange
- H01M8/04029—Heat exchange using liquids
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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
- H01M8/043—Processes for controlling fuel cells or fuel cell systems applied during specific periods
- H01M8/04302—Processes for controlling fuel cells or fuel cell systems applied during specific periods applied during start-up
-
- 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
- H01M8/0432—Temperature; Ambient temperature
- H01M8/04358—Temperature; Ambient temperature of the coolant
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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
-
- 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
- H01M8/04701—Temperature
-
- 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
- H01M8/04701—Temperature
- H01M8/04723—Temperature of the coolant
-
- 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
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- Life Sciences & Earth Sciences (AREA)
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- Manufacturing & Machinery (AREA)
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- Sustainable Energy (AREA)
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Abstract
The application discloses a secondary heat exchange water temperature control device for a fuel cell and a control method thereof, wherein the device comprises a primary heat exchange module and a secondary heat exchange module; the primary heat exchange module is arranged in the electric pile environmental cabin, one side of the primary heat exchange module is reserved with a pipeline interface communicated with an inlet and an outlet of the electric pile liquid cooling pipeline, and the other side of the primary heat exchange module is reserved with a pipeline interface communicated with the secondary heat exchange module; the secondary heat exchange module is tightly attached to the end plate of the environmental cabin and arranged outside the environmental cabin, one side of the secondary heat exchange module, which is close to the end plate, is connected with the primary heat exchange module through a pipeline, and an interface communicated with a chilled water pipeline is reserved on the other side of the secondary heat exchange module. Through the primary heat exchange module and the secondary heat exchange module, the temperature of the cooling liquid input into the liquid cooling pipeline of the electric pile can be effectively controlled, and in addition, through additionally arranging the cooling liquid recovery module, the cooling liquid can be recovered after the cold start test of the electric pile is finished, so that the recycling or harmless treatment of the toxic cooling liquid is facilitated.
Description
Technical Field
The application belongs to the technical field of cold start of fuel cell stacks, and particularly relates to a secondary heat exchange water temperature control device for a fuel cell and a control method thereof.
Background
The cold start test of the fuel cell electric pile is an important ring for detecting the performance quality of the electric pile, and the cold start of the electric pile is realized by combining an electric pile environmental cabin and an electric pile test bench at present. During the test, the electric pile is placed in the environmental cabin, and the hydrogen/air inlet and outlet pipeline, the cooling circuit inlet and outlet pipeline and the like of the electric pile test table penetrate through the corresponding interfaces of the environmental cabin and the electric pile.
The existing scheme has the following three problems in a cooling circuit:
1) In a cold start test of a galvanic pile, the cooling circuit needs to be filled with a cooling liquid, such as a glycol solution, which is toxic and needs to be specially treated at the end of each cold start.
2) The cooling loop reduces the temperature of the cooling liquid through a single heat exchange mode, and the ambient temperature of the electric pile can not be quickly increased to the optimal working range during cold start.
3) The length of the cooling pipeline is longer, and the flow resistance of the pipeline is increased.
Disclosure of Invention
The application provides a secondary heat exchange water temperature control device for a fuel cell and a control method thereof, which solve the problems of difficult cooling liquid recovery treatment, low temperature regulation efficiency, high flow resistance and the like of a cooling loop by arranging a primary heat exchange module in an environmental cabin and arranging a secondary heat exchange module and a cooling liquid recovery module outside the environmental cabin.
The technical scheme provided by the application is as follows:
the secondary heat exchange water temperature control device for the fuel cell comprises a primary heat exchange module and a secondary heat exchange module; the primary heat exchange module is arranged in the electric pile environmental cabin, one side of the primary heat exchange module is reserved with a pipeline interface communicated with an inlet and an outlet of the electric pile liquid cooling pipeline, and the other side of the primary heat exchange module is reserved with a pipeline interface communicated with the secondary heat exchange module; the secondary heat exchange module is tightly attached to the end plate of the environmental cabin and arranged outside the environmental cabin, one side of the secondary heat exchange module, which is close to the end plate, is connected with the primary heat exchange module through a pipeline, and an interface communicated with a chilled water pipeline is reserved on the other side of the secondary heat exchange module.
Further, the primary heat exchange module comprises a cooling liquid storage tank, a first heat exchanger and a first water pump; the cooling liquid storage tank is arranged above the electric pile and the first heat exchanger, a cooling liquid output port of the cooling liquid storage tank is respectively communicated with a first medium input port of the first heat exchanger and an output port of the first water pump through a three-way pipeline, and a fourth pneumatic switch valve is further arranged at the cooling liquid output port; the first medium output port of the first heat exchanger is communicated with the input port of the electric pile liquid cooling pipeline through a pipeline, and a fifth pneumatic switch valve, a fourth temperature sensor and a second pressure sensor are arranged on the communicating pipeline; the output port of the first water pump is provided with a second pneumatic switch valve, the input port of the first water pump is communicated with the output port of the electric pile liquid cooling pipeline through a pipeline, and the communication pipeline is provided with a first pneumatic switch valve, a first temperature sensor and a first pressure sensor.
Further, the secondary heat exchange module comprises a normal temperature liquid storage tank, a second heat exchanger, a third water pump, a heater and a proportional control valve; the normal temperature liquid storage tank is arranged above the first heat exchanger and the second heat exchanger, the output port of the normal temperature liquid storage tank is respectively communicated with the output port of the third water pump and the first medium input port of the second heat exchanger through a three-way pipe, and the second medium output port of the first heat exchanger is communicated with the input port of the third water pump; the second medium input port and the output port of the first heat exchanger are respectively provided with a third temperature sensor and a second temperature sensor; the second medium input port of the second heat exchanger is communicated with the chilled water output pipeline through the proportional regulating valve, and the second medium output port of the second heat exchanger is used for discharging chilled water passing through the second heat exchanger.
Further, the device also comprises a cooling liquid recovery module: be provided with first recovery mouth and the second recovery mouth of coolant liquid on the coolant liquid reservoir, first recovery mouth is connected with the delivery outlet of first water pump through the pneumatic switch valve of third, and the second recovery mouth communicates with the delivery outlet of second water pump, and the input port of second water pump communicates with the first medium input port of first heat exchanger.
Preferably, the first heat exchanger and the second heat exchanger are both plate heat exchangers.
Preferably, the cooling liquid storage tank is internally provided with glycol solution, and the normal temperature liquid storage tank is internally provided with deionized water.
A control method for the secondary heat exchange water temperature control device comprises the following steps:
s1, hardware preparation: placing the galvanic pile in an environmental cabin and respectively connecting with a primary heat exchange module and a secondary heat exchange module, preparing glycol solution, pouring the glycol solution into a cooling liquid storage tank, and injecting deionized water into the normal-temperature liquid storage tank;
s2, degassing the pipeline: opening a first pneumatic switch valve, a second pneumatic switch valve, a fourth pneumatic switch valve and a fifth pneumatic switch valve, starting a first water pump, and discharging the gas in the primary heat exchange module and the electric pile liquid cooling pipeline through a cooling liquid storage tank by using cooling liquid flowing into a pipeline;
s3, low-temperature standing: closing all pneumatic switch valves and water pumps, adjusting the temperature of the environmental chamber to a set temperature, and standing for a period of time according to test requirements;
s4, starting a test: opening the first pneumatic switch valve, the second pneumatic switch valve, the fourth pneumatic switch valve and the fifth pneumatic switch valve, and starting the first water pump; starting a pile, monitoring the pressure of an inlet and an outlet of a pile liquid cooling pipeline in real time through a first pressure sensor and a second pressure sensor, and monitoring the temperature of the inlet and the outlet of the pile liquid cooling pipeline in real time through a first temperature sensor and a fourth temperature sensor; according to the test requirement, the working states of the third water pump, the heater and the proportional regulating valve are regulated;
s5, ending the test: closing the electric pile, all pneumatic switch valves, a proportional control valve, a water pump and a heater;
s6, recovering cooling liquid: opening a third pneumatic switch valve, a fifth pneumatic switch valve and a first pneumatic switch valve, starting a second water pump, and recovering the cooling liquid in the pipeline into a cooling liquid storage tank (7) through a first recovery port and a second recovery port;
and S7, after the cooling liquid is recovered, closing all pneumatic switch valves and water pumps.
Further, in step S4, when the temperature of the cooling liquid circulating between the first heat exchanger and the stack liquid cooling pipeline needs to be raised, the third water pump and the heater are started, and the temperature of the cooling liquid input to the stack liquid cooling pipeline is adjusted by controlling the rotation speed of the third water pump and the power of the heater; when the temperature of the cooling liquid circulating between the first heat exchanger and the stack liquid cooling pipeline needs to be reduced, a third water pump is started, a proportional regulating valve is opened, and the heater is closed.
The application has the beneficial effects that:
according to the application, the primary heat exchange module and the secondary heat exchange module are arranged, so that the temperature of the cooling liquid input into the liquid cooling pipeline of the electric pile can be effectively controlled, and the temperature of the working environment of the electric pile can be improved by using the heater between the two heat exchangers when necessary. In addition, the cooling liquid recovery module is additionally arranged, so that cooling liquid can be recovered after the cold start test of the galvanic pile is finished, and the recycling or harmless treatment of toxic cooling liquid is facilitated.
Drawings
The accompanying drawings are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate the application and together with the embodiments of the application, serve to explain the application.
Figure 1 is a schematic diagram of a frame of a secondary heat exchange water temperature control device according to an embodiment of the present application,
wherein each reference numeral is expressed as: 1-a first pressure sensor, 2-a first temperature sensor, 3-a first pneumatic switch valve, 4-a first water pump, 5-a second pneumatic switch valve, 6-a third pneumatic switch valve, 7-a cooling liquid storage tank, 8-a fourth pneumatic switch valve, 9-a second water pump, 10-a first heat exchanger, 11-a second temperature sensor, 12-a third water pump, 13-a second heat exchanger, 14-a proportional control valve, 15-a heater, 16-a third temperature sensor, 17-a fifth pneumatic switch valve, 18-a fourth temperature sensor, 19-a second pressure sensor and a normal temperature liquid storage tank-20.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
As shown in FIG. 1, the secondary heat exchange water temperature control device provided by the application comprises a primary heat exchange module and a secondary heat exchange module. The primary heat exchange module is arranged in the electric pile environmental cabin, one side of the primary heat exchange module is reserved with a pipeline interface communicated with an inlet and an outlet of the electric pile liquid cooling pipeline, and the other side of the primary heat exchange module is reserved with a pipeline interface communicated with the secondary heat exchange module; the secondary heat exchange module is tightly attached to the end plate of the environmental cabin and is placed outside the environmental cabin, one side of the secondary heat exchange module, which is close to the end plate, is connected with the primary heat exchange module through a pipeline, and an interface communicated with a chilled water pipeline is reserved on the secondary heat exchange module.
The primary heat exchange module comprises a cooling liquid storage tank 7, a first heat exchanger 10, a first water pump 4, a plurality of pneumatic switch valves and corresponding pipelines. The setting height of the cooling liquid storage tank 7 is larger than that of the galvanic pile and the first heat exchanger 10, the output port of the cooling liquid storage tank 7 is respectively communicated with the first medium input port of the first heat exchanger 10 and the output port of the first water pump 4 through a three-way pipeline, the output port of the cooling liquid storage tank 7 is provided with a fourth pneumatic switch valve 8, and the output port of the first water pump 4 is provided with a second pneumatic switch valve 5. The first medium output port of the first heat exchanger 10 is communicated with the input port of the stack liquid cooling pipeline through a pipeline, and a fifth pneumatic switch valve 17, a fourth temperature sensor 18 and a second pressure sensor 19 are arranged on the communicating pipeline. The output port of the electric pile liquid cooling pipeline is communicated with the input port of the first water pump 4 through a pipeline, and a first pneumatic switch valve 3, a first temperature sensor 2 and a first pressure sensor 1 are arranged on the communicating pipeline.
The secondary heat exchange module comprises a normal temperature liquid storage tank 20, a second heat exchanger 13, a third water pump 12, a heater 15 and a proportional control valve 14. The output port of the normal temperature liquid storage tank 20 is respectively communicated with the output port of the third water pump 12 and the first medium input port of the second heat exchanger 13 through a three-way pipe, and the second medium output port of the first heat exchanger 10 is communicated with the input port of the third water pump 12. The second medium input port of the first heat exchanger 10 is communicated with the first medium output port of the second heat exchanger 13 through a pipe, and a heater 15 is provided on the communicating pipe. The second medium input and output of the first heat exchanger 10 are respectively provided with a third temperature sensor 16 and a second temperature sensor 11, and the normal temperature liquid storage tank 20 is arranged at a higher height than the first heat exchanger 10 and the second heat exchanger 13. The second medium input port of the second heat exchanger 13 is communicated with the chilled water output pipeline through a proportional control valve 14, and the second medium output port of the second heat exchanger 13 is used for discharging chilled water passing through the second heat exchanger 13.
In some embodiments, both the first heat exchanger 10 and the second heat exchanger 13 are plate heat exchangers.
All the switching valves in the application are normally closed valves, the fourth pneumatic switching valve 8 is opened, the cooling liquid flows into the first heat exchanger 10 from the cooling liquid storage tank 7 under the action of gravity, the second pneumatic switching valve 5, the fifth pneumatic switching valve 17 and the first pneumatic switching valve 3 are opened, and the first water pump 4 is started, so that the cooling liquid circulates between the first heat exchanger 10 and the electric pile liquid cooling pipeline. Meanwhile, as the fourth pneumatic switch valve 8 is in an open state, even if the pipeline is damaged so that a small amount of leakage occurs to the cooling liquid, the cooling liquid can be timely supplemented. Similarly, in the case where the third water pump 12 is started, the liquid in the normal-temperature liquid reservoir 20 flows into the second heat exchanger 13 and circulates in the pipe between the first heat exchanger 10 and the second heat exchanger 13.
Before the device is used, the pipeline is required to be deaerated. The fourth pneumatic switch valve 8, the second pneumatic switch valve 5, the fifth pneumatic switch valve 17 and the first pneumatic switch valve 3 are opened, the first water pump 4 is started, and the gas in the primary heat exchange module and the electric pile liquid cooling pipeline is discharged through the cooling liquid storage tank 7 by the cooling liquid flowing into the pipeline. The liquid tank 7 is non-closed, and the gas in the pipeline can escape from the liquid level to be discharged.
The ambient temperature at which the stack is operated cannot be too high, but is not as low as possible. After a typical cold start, it is desirable that the ambient temperature of the stack be raised to the optimum operating temperature range and maintained in a short period of time. Before cold start of the electric pile or when the electric pile works, the fourth pneumatic switch valve 8, the second pneumatic switch valve 5, the fifth pneumatic switch valve 17 and the first pneumatic switch valve 3 are opened, the first water pump 4 is started to circulate cooling liquid between the first heat exchanger 10 and the electric pile liquid cooling pipeline, the third water pump 12 and the heater 15 are started at the same time, normal-temperature deionized water circulated in the pipeline between the first heat exchanger 10 and the second heat exchanger 13 is heated rapidly, and the cooling liquid circulated between the first heat exchanger 10 and the electric pile liquid cooling pipeline is heated rapidly through the first heat exchanger 10, so that the environmental temperature of the electric pile is improved. When the cooling liquid rises to a certain temperature, the heater 15 is turned off, and simultaneously the proportional control valve 14 is turned on, the deionized water is cooled by the chilled water entering the second heat exchanger 13, and the temperature of the cooling liquid is lowered by the deionized water flowing into the first heat exchanger 10, so that the ambient temperature of the operation of the electric pile is maintained in a certain range.
Since the cooling liquid of the fuel cell generally adopts glycol solution, and the glycol solution is toxic, the glycol solution needs to be specially treated at the end of each cold start, and the device also comprises a cooling liquid recovery module. As shown in fig. 1, a first recovery port and a second recovery port of the cooling liquid are provided on the cooling liquid storage tank 7, the first recovery port is connected with an output port of the first water pump 4 through the third pneumatic switch valve 6, the second recovery port is communicated with an output port of the second water pump 9, and an input port of the second water pump 9 is communicated with a first medium input port of the first heat exchanger 10.
After the cold start of the electric pile is finished, all the pneumatic switch valves, the water pumps and the heaters are firstly closed, then the third pneumatic switch valve 6, the fifth pneumatic switch valve 17 and the first pneumatic switch valve 3 are opened, the first water pump 4 and the second water pump 9 are started, and the cooling liquid in the pipeline is recovered into the cooling liquid storage tank 7 through the first recovery port and the second recovery port.
In summary, the method of using the device of the present application is summarized as follows:
s1, preparing hardware before cold start test of a galvanic pile: 1) Placing the galvanic pile in an environmental cabin and connecting the galvanic pile with the primary heat exchange module through a reserved pipeline interface, and connecting the secondary heat exchange module with chilled water; 2) Preparing glycol solution, pouring the glycol solution into a cooling liquid storage tank 7, and injecting deionized water into a normal temperature liquid storage tank (20).
S2, degassing the pipeline: the first pneumatic switch valve 3, the second pneumatic switch valve 5, the fourth pneumatic switch valve 8 and the fifth pneumatic switch valve 17 are opened, the first water pump 4 is started, and the gas in the primary heat exchange module and the electric pile liquid cooling pipeline is discharged through the cooling liquid storage tank 7 by the cooling liquid flowing into the pipeline.
S3, cold start low-temperature rest of the galvanic pile: and closing all the switch valves, the regulating valves and the water pump, regulating the temperature of the environmental chamber to a set temperature, and standing for a period of time according to test requirements.
S4, starting a cold start test of the galvanic pile:
1) Opening the first pneumatic switching valve 3, the second pneumatic switching valve 5, the fourth pneumatic switching valve 8 and the fifth pneumatic switching valve 17, and starting the first water pump 4;
2) Starting a pile, monitoring the pressure of an inlet and an outlet of a pile liquid cooling pipeline in real time through a first pressure sensor 1 and a second pressure sensor 19, and monitoring the temperature of the inlet and the outlet of the pile liquid cooling pipeline in real time through a first temperature sensor 2 and a fourth temperature sensor 18;
3) When the temperature of the cooling liquid circulating between the first heat exchanger 10 and the stack liquid cooling pipeline needs to be increased, the third water pump 12 and the heater 15 are started, and the temperature of the cooling liquid input to the stack liquid cooling pipeline is regulated by controlling the rotating speed of the third water pump 12 and the power of the heater 15;
4) When it is desired to reduce the temperature of the coolant circulating between the first heat exchanger 10 and the stack liquid cooling conduit, the third water pump 12 is started, the proportional control valve 14 is opened, and the heater 15 is turned off.
And S5, closing the electric pile, all pneumatic switching valves, regulating valves, a water pump and a heater after the cold start test of the electric pile is finished.
S6, recovering cooling liquid: the third pneumatic switch valve 6, the fifth pneumatic switch valve 17 and the first pneumatic switch valve 3 are opened, the first water pump 4 and the second water pump 9 are started, and the cooling liquid in the pipeline is recovered into the cooling liquid storage tank 7.
And S7, after the cooling liquid is recovered, closing all pneumatic switch valves and water pumps.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the application, the steps may be implemented in any order, and there are many other variations of the different aspects of the application as described above, which are not provided in detail for the sake of brevity; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
Claims (6)
1. The secondary heat exchange water temperature control device for the fuel cell is characterized by comprising a primary heat exchange module and a secondary heat exchange module; the primary heat exchange module is arranged in the electric pile environmental cabin, one side of the primary heat exchange module is reserved with a pipeline interface communicated with an inlet and an outlet of the electric pile liquid cooling pipeline, and the other side of the primary heat exchange module is reserved with a pipeline interface communicated with the secondary heat exchange module; the secondary heat exchange module is tightly attached to the end plate of the environmental cabin and arranged outside the environmental cabin, one side of the secondary heat exchange module, which is close to the end plate, is connected with the primary heat exchange module through a pipeline, and an interface communicated with a chilled water pipeline is reserved on the other side of the secondary heat exchange module;
the primary heat exchange module comprises a cooling liquid storage tank (7), a first heat exchanger (10) and a first water pump (4); the cooling liquid storage tank (7) is arranged above the electric pile and the first heat exchanger (10), a cooling liquid output port of the cooling liquid storage tank is respectively communicated with a first medium input port of the first heat exchanger (10) and an output port of the first water pump (4) through a three-way pipeline, and a fourth pneumatic switch valve (8) is further arranged at the cooling liquid output port; the first medium output port of the first heat exchanger (10) is communicated with the input port of the stack liquid cooling pipeline through a pipeline, and a fifth pneumatic switch valve (17), a fourth temperature sensor (18) and a second pressure sensor (19) are arranged on the communication pipeline; the output port of the first water pump (4) is provided with a second pneumatic switch valve (5), the input port of the first water pump (4) is communicated with the output port of the electric pile liquid cooling pipeline through a pipeline, and the communication pipeline is provided with a first pneumatic switch valve (3), a first temperature sensor (2) and a first pressure sensor (1);
the device also comprises a cooling liquid recovery module: be provided with first recovery mouth and the second recovery mouth of coolant liquid on coolant liquid reservoir (7), first recovery mouth is connected with the delivery outlet of first water pump (4) through third pneumatic switch valve (6), and the delivery outlet intercommunication of second water pump (9), the input port of second water pump (9) and the first medium input port intercommunication of first heat exchanger (10).
2. The secondary heat exchange water temperature control device according to claim 1, wherein the secondary heat exchange module comprises a normal temperature liquid storage tank (20), a second heat exchanger (13), a third water pump (12), a heater (15) and a proportional control valve (14);
the normal temperature liquid storage tank (20) is arranged above the first heat exchanger (10) and the second heat exchanger (13), the output port of the normal temperature liquid storage tank is respectively communicated with the output port of the third water pump (12) and the first medium input port of the second heat exchanger (13) through a three-way pipe, and the second medium output port of the first heat exchanger (10) is communicated with the input port of the third water pump (12); the second medium input port of the first heat exchanger (10) is communicated with the first medium output port of the second heat exchanger (13) through a pipeline, a heater (15) is arranged on the communicated pipeline, and a third temperature sensor (16) and a second temperature sensor (11) are respectively arranged at the second medium input port and the second medium output port of the first heat exchanger (10); the second medium input port of the second heat exchanger (13) is communicated with the chilled water output pipeline through a proportional control valve (14), and the second medium output port of the second heat exchanger is used for discharging chilled water passing through the second heat exchanger (13).
3. The two-stage heat exchange water temperature control device according to claim 2, wherein the first heat exchanger (10) and the second heat exchanger (13) are both plate heat exchangers.
4. The secondary heat exchange water temperature control device according to claim 2, wherein the cooling liquid storage tank (7) is filled with glycol solution, and the normal temperature liquid storage tank (20) is filled with deionized water.
5. A control method for the secondary heat exchange water temperature control device according to claim 4, comprising the steps of:
s1, hardware preparation: placing the galvanic pile in an environmental cabin and respectively connecting with a primary heat exchange module and a secondary heat exchange module, preparing glycol solution, pouring the glycol solution into a cooling liquid storage tank (7), and injecting deionized water into a normal-temperature liquid storage tank (20);
s2, degassing the pipeline: opening a first pneumatic switch valve (3), a second pneumatic switch valve (5), a fourth pneumatic switch valve (8) and a fifth pneumatic switch valve (17), starting a first water pump (4), and discharging the gas in the primary heat exchange module and the electric pile liquid cooling pipeline through a cooling liquid flowing into a pipeline through a cooling liquid storage tank (7);
s3, low-temperature standing: closing all pneumatic switch valves and water pumps, adjusting the temperature of the environmental chamber to a set temperature, and standing for a period of time according to test requirements;
s4, starting a test: opening the first pneumatic switching valve (3), the second pneumatic switching valve (5), the fourth pneumatic switching valve (8) and the fifth pneumatic switching valve (17), and starting the first water pump (4); starting a galvanic pile, monitoring the pressure of an inlet and an outlet of a galvanic pile liquid cooling pipeline in real time through a first pressure sensor (1) and a second pressure sensor (19), and monitoring the temperature of the inlet and the outlet of the galvanic pile liquid cooling pipeline in real time through a first temperature sensor (2) and a fourth temperature sensor (19); according to the test requirement, the working states of the third water pump (12), the heater (15) and the proportional control valve (14) are adjusted;
s5, ending the test: closing the electric pile, all pneumatic switch valves, a proportional control valve, a water pump and a heater;
s6, recovering cooling liquid: opening a third pneumatic switch valve (6), a fifth pneumatic switch valve (17) and a first pneumatic switch valve (3), starting a first water pump (4) and a second water pump (9), and recovering the cooling liquid in the pipeline into a cooling liquid storage tank (7) through a first recovery port and a second recovery port;
and S7, after the cooling liquid is recovered, closing all pneumatic switch valves and water pumps.
6. The control method according to claim 5, wherein in step S4, when the temperature of the coolant circulated between the first heat exchanger (10) and the stack liquid cooling pipe needs to be raised, the third water pump (12) and the heater (15) are activated, and the temperature of the coolant input to the stack liquid cooling pipe is adjusted by controlling the rotation speed of the third water pump (12) and the power of the heater (15); when it is desired to reduce the temperature of the coolant circulating between the first heat exchanger (10) and the stack liquid cooling conduit, the third water pump (12) is started, the proportional control valve (14) is opened, and the heater (15) is turned off.
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