CN115838945A - Circulating water temperature control system of PEM (proton exchange membrane) electrolytic stack test platform - Google Patents
Circulating water temperature control system of PEM (proton exchange membrane) electrolytic stack test platform Download PDFInfo
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- CN115838945A CN115838945A CN202211576157.XA CN202211576157A CN115838945A CN 115838945 A CN115838945 A CN 115838945A CN 202211576157 A CN202211576157 A CN 202211576157A CN 115838945 A CN115838945 A CN 115838945A
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- water temperature
- circulating water
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- temperature
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 148
- 238000012360 testing method Methods 0.000 title claims abstract description 70
- 239000012528 membrane Substances 0.000 title description 4
- 238000010438 heat treatment Methods 0.000 claims abstract description 28
- 238000001816 cooling Methods 0.000 claims abstract description 19
- 239000000498 cooling water Substances 0.000 claims abstract description 14
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 10
- 239000001257 hydrogen Substances 0.000 claims description 10
- 229910052739 hydrogen Inorganic materials 0.000 claims description 10
- 238000013459 approach Methods 0.000 claims description 6
- 238000005868 electrolysis reaction Methods 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- -1 hydrogen ions Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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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
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
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Abstract
The invention relates to the technical field of PEM electrolytic stack test platforms, and discloses a PEM electrolytic stack test platform circulating water temperature control system with stable circulating water temperature maintenance, which comprises the following steps: s101, setting a target water temperature of circulating water of a test system; s102, starting a test system; s103, when the temperature of the circulating water is lower than the target water temperature, heating the test system; s104, when the test system is heated and the water temperature is close to the target water temperature, the test system performs PID control on the heating element; s105, controlling heating of the heating element and operation of the PEM electrolytic stack by the test system to produce heat, wherein the temperature of circulating water is gradually higher than the target water temperature, and starting a circulating water cooling system; s106, when the water temperature is close to the target water temperature, the testing system performs PID control on the flow of cooling water entering the circulating water cooling system, and the opening of the electric flow valve is adjusted in real time; and S107, continuously alternating heating/cooling through the test system to maintain the temperature of the circulating water to be stable at a target value.
Description
Technical Field
The invention relates to the technical field of PEM electrolytic stack test platforms, in particular to a circulating water temperature control system of a PEM electrolytic stack test platform.
Background
The hydrogen gas is dissociated at its anode into positively charged hydrogen ions, releasing negatively charged electrons, which pass through the PEM proton membrane to the cathode to effect the hydrogen-oxygen separation. Currently, a PEM electrolytic stack releases a large amount of heat in an operating state, and the heat needs to be dissipated to the outside in time, so that the operating temperature of the PEM electrolytic stack is in a reasonable temperature range (such as 45 ℃ -58 ℃). However, when the inlet water temperature of the PEM electrolytic stack is at a lower temperature or a higher temperature, the resistance of the PEM electrolytic stack increases, so that the voltage correspondingly increases, and the electrolysis efficiency of the PEM electrolytic stack is low when the PEM electrolytic stack is operated at a high temperature or a low temperature for a long time.
Therefore, how to maintain the circulating water of the PEM electrolytic stack to operate at a stable temperature becomes a technical problem which needs to be solved urgently by the technical personnel in the field.
Disclosure of Invention
The invention aims to solve the technical problem that in the prior art, when the inlet water temperature of a PEM electrolytic stack is lower or higher, the resistance of the PEM electrolytic stack is increased, so that the voltage is correspondingly increased, and the electrolytic efficiency of the PEM electrolytic stack is low when the PEM electrolytic stack runs at a high-temperature or low-temperature state for a long time.
The technical scheme adopted by the invention for solving the technical problems is as follows: a circulating water temperature control system of a PEM electrolytic stack test platform is constructed, and is characterized by comprising the following steps:
s101, setting a target water temperature of circulating water of a test system;
s102, starting a test system, and controlling a PEM electrolytic stack to electrolyze and produce hydrogen;
s103, when the temperature of the circulating water is lower than the target water temperature, heating the test system;
s104, when the test system is heated and the water temperature is close to the target water temperature, the test system performs PID control on the heating element;
s105, the test system controls heating of the heating element and operation of the PEM electrolytic stack to produce hydrogen and generate heat, the temperature of circulating water is higher than the target water temperature, and the circulating water cooling system is started;
s106, when the test system is cooled and the water temperature is close to the target water temperature, the test system performs PID control on cooling water flow entering a circulating water cooling system, the cooling water flow is controlled through an electric flow valve, and the opening of the electric flow valve is adjusted in real time;
and S107, continuously alternating heating/cooling through the test system to maintain the temperature of the circulating water to be stable at a target value.
In some embodiments, in step S101, the target water temperature range of the circulating water is set at 45 ℃ to 55 ℃.
In some embodiments, in step S103, when the temperature of the circulating water is lower than the target water temperature, the test system is heated, and the cooling system is in a closed state at this time.
In some embodiments, in step S104, when the test system heats up and the water temperature approaches the target water temperature, the test system performs PID control on the heating element, and controls the on/off state of the heating element through a solid-state relay.
In some embodiments, in step S105, the cooling system at least comprises a cold water loop, a plate heat exchanger and a circulating water loop,
and the cold water loop and the circulating water loop respectively adopt independent plate heat exchangers, and cold and heat exchange is carried out in the plate heat exchangers.
In some embodiments, in step S106, when the test system is cooled and the water temperature approaches the target water temperature, the test system performs PID control on the flow rate of the cooling water entering the plate heat exchanger, and controls the flow rate of the cooling water through the electric flow valve, thereby adjusting the opening degree of the electric flow valve in real time.
In the circulating water temperature control system of the PEM electrolytic stack test platform, the target water temperature of the circulating water temperature is set in the test system, the temperature value of the circulating water temperature is detected in real time, the temperature value of the circulating water temperature is compared with the target water temperature, and the circulating water is heated or cooled according to the result to maintain the circulating water temperature to be stable at the target value, so that the circulating water of the PEM electrolytic stack can be maintained in a stable temperature range, the electrolytic conversion efficiency of the PEM electrolytic stack is improved, and the stability and the reliability of the running of the PEM electrolytic stack are ensured.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a flow chart illustrating the steps of one embodiment of a system for controlling the circulating water temperature of a PEM electrolytic cell test platform according to the present invention;
FIG. 2 is a schematic diagram of closed loop control of an embodiment of a circulating water temperature control system of a PEM electrolytic stack test platform provided by the invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1-2, in a first embodiment of the PEM electrolytic stack test platform circulating water temperature control system of the present invention, the PEM electrolytic stack test platform circulating water temperature control system comprises the following steps:
s101, setting a target water temperature of circulating water introduced into a PEM electrolytic cell by a test system;
s102, starting a test system, and controlling a PEM electrolytic stack to electrolyze and produce hydrogen;
s103, when the temperature of the circulating water is lower than the target water temperature, heating the test system;
s104, when the test system is heated and the water temperature is close to the target water temperature, the test system performs PID control on the heating element;
s105, heating the heating element along with the control of the test system, and producing heat by running the PEM electrolytic stack to make the return water temperature of the circulating water gradually higher than the target water temperature, starting the circulating water cooling system at the moment, and performing heat exchange on the circulating water temperature through the cooling system to reduce the temperature of the circulating water;
s106, when the test system is cooled and the water temperature is close to the target water temperature, the test system performs PID control on cooling water flow entering a circulating water cooling system, the cooling water flow is controlled through an electric flow valve, and the opening of the electric flow valve is adjusted in real time;
the feedback in the PID control is a control in which the deviation between the output value and the target value is integrated to control the input value.
S107, continuously alternating heating/cooling through the test system to maintain the temperature of circulating water to be stabilized at a target value and ensure that the PEM electrolytic cell runs to produce hydrogen at a better water temperature.
For example, a PEM electrolytic stack (e.g., 10 m) 3 H) operating at rated current/voltage;
when the temperature of the circulating water is in the range of 20-40 ℃, the hydrogen production of the PEM electrolytic stack is predicted to be 8m 3 /h；
When the water temperature of the circulating water is in the range of 45-55 ℃, the hydrogen production of the PEM electrolytic stack is predicted to be 10m 3 /h；
When the water temperature of the circulating water is more than 65 ℃, the hydrogen production of the PEM electrolytic stack is predicted to be 9.5m 3 And h, although the hydrogen production effect is only slightly lower than that of the PEM electrolytic stack operated in the optimal water temperature state when the circulating water temperature is higher than the optimal water temperature state, the service life of the PEM electrolytic stack can be influenced (for example, a proton membrane is broken down) when the PEM electrolytic stack is operated for a long time.
By using the technical scheme, the target water temperature of the circulating water temperature is set in the test system, the temperature value of the circulating water temperature is detected in real time, the temperature value of the circulating water temperature is compared with the target water temperature, and the circulating water is heated or cooled according to the result to maintain the circulating water temperature to be stable at the target value, so that the circulating water of the PEM electrolytic stack can be maintained in a stable temperature range, the electrolytic conversion efficiency of the PEM electrolytic stack is improved, and the stability and the reliability of the running of the PEM electrolytic stack are ensured.
In some embodiments, as shown in fig. 2, in step S101, the target water temperature range of the circulating water is set at 45 ℃ to 55 ℃, and the initial temperature range of the circulating water is typically between 20 ℃ to 30 ℃.
In some embodiments, in step S103, when the temperature of the circulating water is lower than the target water temperature, the test system is heated, and the cooling system is in a closed state.
In some embodiments, in step S104, when the test system heats and the water temperature approaches the target water temperature, the test system performs PID control on the heating element, and controls the on/off state of the heating element through a solid-state relay.
Specifically, the PLC is used for receiving a target water temperature value fed back and detected by the temperature sensor and the opening degree of the cold water valve, carrying out PID control according to the fed target water temperature value, and controlling the solid-state relay to be conducted when the target water temperature value is lower than a target water temperature range so as to control the heating element to heat circulating water;
when the target water temperature value is higher than the target water temperature range, the PLC is conducted by controlling the cooling water flow control valve, and then the plate heat exchanger is controlled to cool the circulating water, so that the temperature of the circulating water is maintained within the target water temperature range.
In some embodiments, in step S105, the cooling system at least comprises a cold water loop, a plate heat exchanger and a circulating water loop,
and the cold water loop and the circulating water loop respectively adopt independent plate heat exchangers, and cold and heat exchange is carried out in the plate heat exchangers.
In some embodiments, in step S106, when the test system is cooled and the water temperature approaches the target water temperature, the test system performs PID control on the flow rate of the cooling water entering the plate heat exchanger, and controls the flow rate of the cooling water through the electric flow valve, thereby adjusting the opening degree of the electric flow valve in real time.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. A circulating water temperature control system of a PEM electrolytic stack test platform is characterized by comprising the following steps:
s101, setting a target water temperature of circulating water of a test system;
s102, starting the test system, and controlling a PEM electrolytic stack to electrolyze and produce hydrogen;
s103, when the temperature of circulating water is lower than the target water temperature, heating the test system;
s104, when the test system is heated and the water temperature is close to the target water temperature, the test system performs PID control on the heating element;
s105, the test system controls heating of the heating element and operation of the PEM electrolytic stack to produce heat, the temperature of the circulating water is higher than the target water temperature, and the circulating water cooling system is started;
s106, when the test system is cooled and the water temperature is close to the target water temperature, the test system performs PID control on cooling water flow entering a circulating water cooling system, the cooling water flow is controlled through an electric flow valve, and the opening of the electric flow valve is adjusted in real time;
and S107, continuously alternating heating/cooling through the test system to maintain the temperature of the circulating water to be stable at a target value.
2. The PEM electrolysis stack test platform circulating water temperature control system according to claim 1,
in step S101, the target water temperature range of the circulating water is set at 45 ℃ to 55 ℃.
3. The PEM electrolysis stack test platform circulating water temperature control system according to claim 1,
in step S103, when the temperature of the circulating water is lower than the target water temperature, the test system performs heating, and the cooling system is in a closed state at this time.
4. The PEM electrolysis stack test platform circulating water temperature control system according to claim 1,
in step S104, when the test system heats and the water temperature approaches the target water temperature, the test system performs PID control on the heating element, and controls the on/off state of the heating element through a solid-state relay.
5. The PEM electrolysis stack test platform circulating water temperature control system according to claim 1,
in step S105, the cooling system at least includes a cold water loop, a plate heat exchanger, and a circulating water loop,
and the cold water loop and the circulating water loop respectively adopt independent plate heat exchangers, and cold and heat exchange is carried out in the plate heat exchangers.
6. The PEM electrolysis stack test platform circulating water temperature control system according to claim 5,
in step S106, when the test system is cooled and the water temperature approaches the target water temperature, the test system performs PID control on the cooling water flow entering the plate heat exchanger, and controls the cooling water flow through the electric flow valve, thereby adjusting the opening of the electric flow valve in real time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211576157.XA CN115838945A (en) | 2022-12-09 | 2022-12-09 | Circulating water temperature control system of PEM (proton exchange membrane) electrolytic stack test platform |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211576157.XA CN115838945A (en) | 2022-12-09 | 2022-12-09 | Circulating water temperature control system of PEM (proton exchange membrane) electrolytic stack test platform |
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| Publication Number | Publication Date |
|---|---|
| CN115838945A true CN115838945A (en) | 2023-03-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211576157.XA Pending CN115838945A (en) | 2022-12-09 | 2022-12-09 | Circulating water temperature control system of PEM (proton exchange membrane) electrolytic stack test platform |
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| CN (1) | CN115838945A (en) |
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- 2022-12-09 CN CN202211576157.XA patent/CN115838945A/en active Pending
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