CN115172820A - Hydrogen leakage detection method - Google Patents
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- CN115172820A CN115172820A CN202210973132.7A CN202210973132A CN115172820A CN 115172820 A CN115172820 A CN 115172820A CN 202210973132 A CN202210973132 A CN 202210973132A CN 115172820 A CN115172820 A CN 115172820A
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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
- H01M8/04432—Pressure differences, e.g. between anode and cathode
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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
- H01M8/04313—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
- H01M8/04402—Pressure; Ambient pressure; Flow of anode exhausts
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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
- H01M8/04664—Failure or abnormal function
- H01M8/04679—Failure or abnormal function of fuel cell stacks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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Abstract
The invention discloses a hydrogen leakage detection method, which is applied to a fuel cell, wherein the fuel cell comprises an electric pile, the electric pile is provided with an anode inlet and an anode outlet, and the method comprises the following steps: enabling the fuel cell to be in a post-operation stage, and inputting hydrogen to the anode inlet to enable the hydrogen pressure at the anode inlet to reach the detection pressure; measuring the hydrogen pressure at the anode inlet, waiting for a preset time, and judging that initial leakage occurs if the difference between the first hydrogen inlet pressure and the first hydrogen inlet initial pressure is greater than or equal to a first preset threshold value, or the difference between the first hydrogen outlet pressure and the first hydrogen outlet initial pressure is greater than or equal to the first preset threshold value; measuring a second hydrogen input initial pressure, and measuring a second hydrogen output initial pressure; waiting for a preset time, and if the difference value between the second hydrogen inlet pressure and the second hydrogen inlet initial pressure is greater than or equal to a first preset threshold value, or the difference value between the second hydrogen outlet pressure and the first hydrogen outlet initial pressure is greater than or equal to a first preset threshold value, judging that serious leakage occurs.
Description
Technical Field
The invention relates to a fuel cell system, in particular to a hydrogen leakage detection method.
Background
If the pipeline or the electric pile in the hydrogen fuel cell leaks hydrogen, the safe operation of the system can be influenced. Many leaks do not have a significant impact on the normal operation of the system at the early stages of occurrence, and it is therefore difficult to detect such minute leaks by detecting operating parameters while the system is in operation. And the external hydrogen concentration sensor also has the limitation of detecting the faults. First, the sensor arrangement is not necessarily located exactly near the leak point, and there may be false positives. Secondly, the gas sensor needs to be calibrated regularly, otherwise false alarm and missing report may exist. Thirdly, the cost is increased by arranging the sensor, and the system integration efficiency is influenced at the same time. Therefore, there is a need to design and develop an indirect method for online detection of hydrogen leakage.
Disclosure of Invention
The invention provides a hydrogen leakage detection method for overcoming the defect of hydrogen leakage detection by using a sensor in the prior art.
An embodiment of the present invention provides a hydrogen leakage detection method applied to a fuel cell, the fuel cell including a stack having an anode inlet and an anode outlet, the method including the steps of:
enabling the fuel cell to be in a post-operation stage, and inputting hydrogen to the anode inlet to enable the hydrogen pressure at the anode inlet to reach the detection pressure;
measuring the hydrogen pressure at the inlet of the anode, marking the measurement result as a first hydrogen inlet initial pressure, measuring the hydrogen pressure at the outlet of the anode, and marking the measurement result as a first hydrogen outlet initial pressure;
waiting for a preset time, measuring the hydrogen pressure at the inlet of the anode, marking the measurement result as a first hydrogen inlet pressure, measuring the hydrogen pressure at the outlet of the anode, marking the measurement result as a first hydrogen outlet pressure, and if the difference value between the first hydrogen inlet pressure and the first hydrogen inlet initial pressure is greater than or equal to a first preset threshold value, or the difference value between the first hydrogen outlet pressure and the first hydrogen outlet initial pressure is greater than or equal to the first preset threshold value, judging that initial leakage occurs;
the hydrogen pressure at the anode inlet is brought to the detection pressure again;
measuring the hydrogen pressure at the inlet of the anode, marking the measurement result as the second hydrogen inlet initial pressure, measuring the hydrogen pressure at the outlet of the anode, and marking the measurement result as the second hydrogen outlet initial pressure;
and waiting for a preset time, measuring the hydrogen pressure at the inlet of the anode, marking the measurement result as a second hydrogen inlet pressure, measuring the hydrogen pressure at the outlet of the anode, marking the measurement result as a second hydrogen outlet pressure, and judging that serious leakage occurs if the difference value between the second hydrogen inlet pressure and the second hydrogen inlet initial pressure is greater than or equal to a first preset threshold value, or the difference value between the second hydrogen outlet pressure and the first hydrogen outlet initial pressure is greater than or equal to a first preset threshold value.
The hydrogen leakage detection method has the following advantages:
in the present embodiment, at the time of detection of the anode seal of the fuel cell, a first diagnosis of the fuel cell may be performed, specifically, the first hydrogen in initial pressure and the first hydrogen out initial pressure are first recorded. After waiting for a preset time, measuring the hydrogen pressure at the anode inlet and the anode outlet again, and recording the detection results as a first hydrogen inlet pressure and a first hydrogen outlet pressure. At this time, it is determined whether the difference between the first hydrogen inlet pressure and the first hydrogen inlet initial pressure and the difference between the first hydrogen outlet pressure and the first hydrogen outlet initial pressure are within the preset threshold, and it is determined that the initial leak is generated if one of the differences is greater than or equal to the preset threshold. At this time, the fuel cell needs to be diagnosed for the second time, that is, the hydrogen pressure at the anode inlet needs to reach the detection pressure again, the second hydrogen inlet initial pressure and the second hydrogen outlet initial pressure are sequentially recorded, after waiting for a preset time, the hydrogen pressures at the anode inlet and the anode outlet are measured again, the detection results are recorded as the second hydrogen inlet pressure and the second hydrogen outlet pressure, then, the judgment is continued, and if the difference between the second hydrogen inlet pressure and the second hydrogen inlet initial pressure and the difference between the second hydrogen outlet pressure and the second hydrogen outlet initial pressure are still greater than the preset threshold, it is judged that the fuel cell has serious leakage. Through the hydrogen detection method in the embodiment, a hydrogen pressure detection sensor is not needed, so that a series of problems caused by the use of the sensor can be avoided, and the false alarm can be greatly avoided during the detection of the hydrogen pressure through twice detection.
The hydrogen leakage detection method in the embodiment of the present invention may further include the following technical features:
in some embodiments of the present application, the method further comprises: and if the difference value between the first hydrogen inlet pressure and the first hydrogen inlet initial pressure is smaller than the first preset threshold and larger than the second preset threshold, or the difference value between the first hydrogen outlet pressure and the first hydrogen outlet initial pressure is smaller than the first preset threshold or larger than the second preset threshold, judging that slight leakage occurs.
In some embodiments of the present application, the method further comprises: and if the difference value between the first hydrogen inlet pressure and the first hydrogen inlet initial pressure is smaller than the second preset threshold value, or the difference value between the first hydrogen outlet pressure and the first hydrogen outlet initial pressure is smaller than the second preset threshold value, judging that no leakage occurs.
In some embodiments of the present application, the steps of the method further comprise: if the difference value between the second hydrogen inlet pressure and the second hydrogen inlet initial pressure is smaller than a first preset threshold and larger than a second preset threshold, or the difference value between the second hydrogen outlet pressure and the second hydrogen outlet initial pressure is smaller than the first preset threshold and larger than the second preset threshold, judging that slight leakage occurs;
in some embodiments of the present application, the steps of the method further comprise: and if the difference value between the second hydrogen input pressure and the second hydrogen input initial pressure is smaller than a second preset threshold value, or the difference value between the second hydrogen output pressure and the second hydrogen output initial pressure is smaller than the second preset threshold value, judging that no leakage occurs.
In some embodiments of the present application, the steps of the method further comprise: the step of bringing the hydrogen pressure at the anode inlet to the detection pressure again includes:
judging whether the first hydrogen inlet pressure or the first hydrogen outlet pressure is in the range of the detection pressure, and if the first hydrogen inlet pressure or the first hydrogen outlet pressure is in the range of the detection pressure, continuing to detect;
and if the first hydrogen inlet pressure or the first hydrogen outlet pressure is smaller than the detection pressure, inputting hydrogen into the anode inlet again to enable the hydrogen pressure at the anode inlet to reach the detection pressure.
In some embodiments of the present application, the step of determining that a serious leak has occurred further includes:
a class 2 fault is designated, and if an anode seal leak fault clear command is not issued, the fuel cell is inhibited from being started.
In some embodiments of the present application, the detection is stopped if a hydrogen conservation shutdown or an emergency shutdown occurs during the detection.
In some embodiments of the present application, the first predetermined threshold is 10kpa to 15kap.
In some embodiments of the present application, the second preset threshold is 5kpa to 8kpa.
In some embodiments of the present application, the predetermined time is 15s or less.
In some embodiments of the present application, the detection pressure ranges from 150kpa to 180kpa.
Drawings
FIG. 1 is a schematic flow diagram of a hydrogen leak detection method in one embodiment of the present invention;
fig. 2 is a schematic flow chart of a hydrogen leakage detection method according to another embodiment of the present 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.
The technical solutions in the embodiments of the present invention are 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, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.
As shown in fig. 1, the present invention provides a hydrogen leakage detection method applied to a fuel cell including a stack having an anode inlet and an anode outlet, the method comprising the steps of:
s10, enabling the fuel cell to be in a post-operation stage, and inputting hydrogen to an anode inlet to enable the hydrogen pressure at the anode inlet to reach detection pressure;
s20, measuring the hydrogen pressure at the inlet of the anode, marking the measurement result as a first hydrogen inlet initial pressure, measuring the hydrogen pressure at the outlet of the anode, and marking the measurement result as a first hydrogen outlet initial pressure;
s30, waiting for a preset time, measuring the hydrogen pressure at the inlet of the anode, marking the measurement result as a first hydrogen inlet pressure, measuring the hydrogen pressure at the outlet of the anode, marking the measurement result as a first hydrogen outlet pressure, and judging that initial leakage occurs if the difference value between the first hydrogen inlet pressure and the first hydrogen inlet initial pressure is greater than or equal to a first preset threshold value, or the difference value between the first hydrogen outlet pressure and the first hydrogen outlet initial pressure is greater than or equal to the first preset threshold value;
s40, enabling the hydrogen pressure at the anode inlet to reach the detection pressure again;
s50, measuring the hydrogen pressure at the inlet of the anode, marking the measurement result as a second hydrogen inlet initial pressure, measuring the hydrogen pressure at the outlet of the anode, and marking the measurement result as a second hydrogen outlet initial pressure;
s60, waiting for a preset time, measuring the hydrogen pressure at the inlet of the anode, marking the measurement result as a second hydrogen inlet pressure, measuring the hydrogen pressure at the outlet of the anode, marking the measurement result as a second hydrogen outlet pressure, and if the difference value between the second hydrogen inlet pressure and the second hydrogen inlet initial pressure is greater than or equal to a first preset threshold value, or the difference value between the second hydrogen outlet pressure and the first hydrogen outlet initial pressure is greater than or equal to the first preset threshold value, judging that serious leakage occurs.
According to the hydrogen leakage detection method in the embodiment of the present application, it is capable of performing hydrogen leakage detection on a fuel cell, generally speaking, the fuel cell includes a stack, the stack includes an anode inlet and an anode outlet, and it is understood that the gas input by the anode inlet in the hydrogen fuel cell is hydrogen. At the start of the detection, the fuel cell may be placed in a post-operation phase, which may also be denoted as St _ afftrun, which means that the fuel cell is in a shutdown state. The shutdown state may be FSD (cold shutdown) or NSD (normal temperature shutdown). When the fuel cell is subjected to hydrogen detection, a switch for detecting the anode sealing needs to be opened, which may be represented as KeCfg _ b _ AnSealChkEn = =1 in some embodiments, so that hydrogen can be filled into the anode inlet to make the hydrogen pressure at the anode inlet reach a detection pressure, which may also be represented as KeAnSealChk _ p _ sealchankrprsset.
In this embodiment, when detecting the anode seal of the fuel cell, a first diagnosis of the fuel cell may be performed, specifically, a first hydrogen-in initial pressure and a first hydrogen-out initial pressure are recorded, where the first hydrogen-in initial pressure may also be denoted as leanselalchk _ p _ ansusilnitprs, and the first hydrogen-out initial pressure may also be denoted as leanselalchk _ p _ AnDsInitPrs. After waiting for the preset time, the hydrogen pressures at the anode inlet and the anode outlet are measured again, and the detection results are recorded as the first hydrogen-in pressure and the first hydrogen-out pressure, it is understood that the measurement needs to be performed for 0.05 second to 1 second, preferably about 0.5 second, so that signal jitter can be prevented. The preset time may also be denoted as keanasealchk _ t _ MaxChkTi. At this time, it is determined whether the difference between the first hydrogen inlet pressure and the first hydrogen inlet initial pressure and the difference between the first hydrogen outlet pressure and the first hydrogen outlet initial pressure are within the preset threshold, and it is determined that the initial leak is generated if one of the differences is greater than or equal to the preset threshold. At this time, the fuel cell needs to be diagnosed for the second time, that is, the hydrogen pressure at the anode inlet needs to reach the detection pressure again, the second hydrogen inlet initial pressure and the second hydrogen outlet initial pressure are sequentially recorded, after waiting for a preset time, the hydrogen pressures at the anode inlet and the anode outlet are measured again, the detection results are recorded as the second hydrogen inlet pressure and the second hydrogen outlet pressure, then, the judgment is continued, and if the difference between the second hydrogen inlet pressure and the second hydrogen inlet initial pressure and the difference between the second hydrogen outlet pressure and the second hydrogen outlet initial pressure are still greater than the preset threshold, it is judged that the fuel cell has serious leakage. Through the hydrogen detection method in the embodiment, a hydrogen pressure detection sensor is not needed, so that a series of problems caused by the use of the sensor can be avoided, and the occurrence of false alarm during hydrogen pressure detection can be greatly avoided through twice detection.
In some embodiments of the present application, the hydrogen leakage detection method further includes determining that a slight leakage occurs if a difference between the first hydrogen input pressure and the first hydrogen input initial pressure is smaller than a first preset threshold and larger than a second preset threshold, or a difference between the first hydrogen output pressure and the first hydrogen output initial pressure is smaller than the first preset threshold or larger than the second preset threshold. In this embodiment, the second preset threshold may be represented as mzanasealchk _ p _ PrsLeakThd. When the difference is between the first preset threshold and the second preset threshold, it can be determined that a slight leak has occurred. In some embodiments, the slight leak may be denoted as DFC _ ansealchkler.
In some embodiments of the present application, the hydrogen leakage detection method further includes determining that no leakage occurs if a difference between the first hydrogen input pressure and the first hydrogen input initial pressure is smaller than a second preset threshold, or if a difference between the first hydrogen output pressure and the first hydrogen output initial pressure is smaller than the second preset threshold. In this embodiment, if the result of the first diagnosis in the anode inlet and the anode outlet is less than the second preset threshold, it may be determined that no leakage has occurred. At this time, the detection may be stopped, or may be continued to avoid the occurrence of false alarm, which is not particularly limited herein.
In some embodiments of the present application, the hydrogen leakage detection method further includes determining that a slight leakage occurs if a difference between the second hydrogen input pressure and the second hydrogen input initial pressure is smaller than a first preset threshold and larger than a second preset threshold, or a difference between the second hydrogen output pressure and the second hydrogen output initial pressure is smaller than the first preset threshold and larger than the second preset threshold. In the present embodiment, as long as any one of the above results is satisfied, it can be determined that a slight leak has occurred.
In some embodiments of the present application, the hydrogen leakage detecting method further includes determining that no leakage occurs if a difference between the second hydrogen input pressure and the second hydrogen input initial pressure is smaller than a second preset threshold, or if a difference between the second hydrogen output pressure and the second hydrogen output initial pressure is smaller than a second preset threshold. In this embodiment, if the results of the second diagnosis in the anode inlet and the anode outlet are both smaller than the second preset threshold, it may be determined that no leak has occurred.
In some embodiments of the present application, the step of bringing the pressure of the hydrogen gas at the anode inlet to the detected pressure again comprises:
s41, judging whether the first hydrogen inlet pressure or the first hydrogen outlet pressure is in the range of the detection pressure, and if the first hydrogen inlet pressure or the first hydrogen outlet pressure is in the range of the detection pressure, continuing to detect;
and S42, inputting hydrogen into the anode inlet again if the first hydrogen inlet pressure or the first hydrogen outlet pressure is smaller than the detection pressure, so that the hydrogen pressure at the anode inlet reaches the detection pressure. In this embodiment, before the second diagnosis is performed, it may be determined whether the first hydrogen inlet pressure or the first hydrogen outlet pressure is within the range of the detection pressure, and if so, the detection may be continued, that is, the second diagnosis is performed. If the pressure is smaller than the minimum value of the range of the detection pressure, hydrogen needs to be input into the anode inlet, so that the hydrogen pressure at the anode inlet reaches the detection pressure, and after the detection pressure is reached, the pressure needs to be maintained for about 0.5 to 1 second, so that the detection pressure is confirmed to be stabilized within the preset value, and the second diagnosis is carried out after the pressure is waited for about 0.5 to 1 second.
As shown in fig. 2, in some embodiments of the present application, the step of determining that a serious leak has occurred further includes:
and S70, calibrating the fault as a 2-level fault, and if the anode sealing leakage fault clearing instruction is not carried out, prohibiting starting the fuel cell. In this embodiment, if a severe leak occurs, it needs to be marked as a level 2 fault, at this time, the device is not allowed to be powered on again, the fault cannot be cleared electrically, the fault can be cleared only by the anode seal leak fault clearing instruction in the upper computer from 0 to 1, and in some implementations, the anode seal leak fault clearing instruction may also be denoted as DIAG _ b _ AnSealChkClrFlg.
In some embodiments of the present application, the detection is stopped if a hydrogen conservation shutdown or an emergency shutdown occurs during the detection. In the present embodiment, the hydrogen-retention shutdown may be denoted as FID _ relston, and the emergency shutdown may be denoted as FID _ EmgyStop. If the fuel cell is shut down suddenly, the fault causing the shut down needs to be eliminated first to avoid causing potential safety hazard, and the detection can be continued only after all faults are eliminated.
In some embodiments of the present application, the first preset threshold is 10kpa to 15kpa. In this embodiment, the value of the first preset threshold value cannot be too high, otherwise, the report can be missed, the value cannot be too low, otherwise, the false report can be missed, and therefore, the occurrence of the false report and the false report can be effectively avoided when the first preset threshold value is between 10kpa and 15kpa. Preferably, the first preset threshold is 10kpa.
In some embodiments of the present application, the second preset threshold is between 5kpa and 8kpa. In this embodiment, the value of the second preset threshold cannot be too high, otherwise, the second preset threshold is easily overlapped with the first preset threshold, and causes a false alarm, and cannot be too low, otherwise, the false alarm may frequently occur. Preferably, the second preset threshold is 5kap, so that the occurrence of false negative and false positive can be effectively avoided.
In some embodiments of the present application, the predetermined time is 15s or less. In this embodiment, the preset time may be less than or equal to 15s to avoid the detection time being too long, and preferably, the preset time is 10s and 8s.
In some embodiments of the present application, the detection pressure ranges from 150kpa to 180kpa. In the present embodiment, the detection pressure cannot be excessively large, otherwise, if a serious leak occurs, static electricity is easily caused and hydrogen may be ignited, and if the detection pressure is excessively small, a leak judgment is easily caused. Preferably, the detection pressure can be between 150kpa and 160kpa, so that the potential safety hazard can be avoided on the premise of accurate diagnosis.
While the invention has been described with reference to several particular embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. A hydrogen leak detection method for use with a fuel cell including a stack having an anode inlet and an anode outlet, the method comprising the steps of:
enabling the fuel cell to be in a post-operation stage, and inputting hydrogen to the anode inlet to enable the hydrogen pressure at the anode inlet to reach a detection pressure;
measuring the hydrogen pressure at the anode inlet and marking the measurement result as a first hydrogen-in initial pressure, measuring the hydrogen pressure at the anode outlet and marking the measurement result as a first hydrogen-out initial pressure;
waiting for a preset time, measuring the hydrogen pressure at the anode inlet, marking the measurement result as a first hydrogen inlet pressure, measuring the hydrogen pressure at the anode outlet, marking the measurement result as a first hydrogen outlet pressure, and if the difference value between the first hydrogen inlet pressure and the first hydrogen inlet initial pressure is greater than or equal to a first preset threshold value, or the difference value between the first hydrogen outlet pressure and the first hydrogen outlet initial pressure is greater than or equal to a first preset threshold value, judging that initial leakage occurs;
bringing the hydrogen pressure at the anode inlet to the detection pressure again;
measuring the hydrogen pressure at the anode inlet, marking the measurement result as a second hydrogen inlet initial pressure, measuring the hydrogen pressure at the anode outlet, and marking the measurement result as a second hydrogen outlet initial pressure;
and waiting for a preset time, measuring the hydrogen pressure at the anode inlet, marking the measurement result as a second hydrogen inlet pressure, measuring the hydrogen pressure at the anode outlet, marking the measurement result as a second hydrogen outlet pressure, and judging that serious leakage occurs if the difference value between the second hydrogen inlet pressure and the second hydrogen inlet initial pressure is greater than or equal to a first preset threshold value, or the difference value between the second hydrogen outlet pressure and the first hydrogen outlet initial pressure is greater than or equal to a first preset threshold value.
2. The method of claim 1, wherein the method steps further comprise: and if the difference value between the first hydrogen inlet pressure and the first hydrogen inlet initial pressure is smaller than the first preset threshold and larger than the second preset threshold, or the difference value between the first hydrogen outlet pressure and the first hydrogen outlet initial pressure is smaller than the first preset threshold or larger than the second preset threshold, judging that slight leakage occurs.
3. The method of claim 1, wherein the method steps further comprise: if the difference value between the first hydrogen inlet pressure and the first hydrogen inlet initial pressure is smaller than the second preset threshold, or the difference value between the first hydrogen outlet pressure and the first hydrogen outlet initial pressure is smaller than the second preset threshold, it is determined that no leakage occurs.
4. The method of claim 1, wherein the method steps further comprise: and if the difference value between the second hydrogen inlet pressure and the second hydrogen inlet initial pressure is smaller than a first preset threshold and larger than a second preset threshold, or the difference value between the second hydrogen outlet pressure and the second hydrogen outlet initial pressure is smaller than the first preset threshold and larger than the second preset threshold, judging that slight leakage occurs.
5. The method of claim 1, wherein the method steps further comprise: and if the difference value between the second hydrogen input pressure and the second hydrogen input initial pressure is smaller than a second preset threshold value, or the difference value between the second hydrogen output pressure and the second hydrogen output initial pressure is smaller than the second preset threshold value, judging that no leakage occurs.
6. The method of claim 1, wherein the method steps further comprise: the step of bringing the hydrogen pressure at the anode inlet to the detection pressure again includes:
judging whether the first hydrogen inlet pressure or the first hydrogen outlet pressure is in the range of the detection pressure, and if the first hydrogen inlet pressure or the first hydrogen outlet pressure is in the range of the detection pressure, continuing to detect;
and if the first hydrogen inlet pressure or the first hydrogen outlet pressure is smaller than the detection pressure, inputting hydrogen into the anode inlet again to enable the hydrogen pressure at the anode inlet to reach the detection pressure.
7. The method of any one of claims 1 to 6, wherein the step of determining that a serious leak has occurred further comprises:
a class 2 fault is calibrated and if no anode seal leak fault clearing command is issued, the fuel cell is inhibited from starting.
8. The method according to any one of claims 1 to 6, wherein the detection is stopped if a hydrogen-retention shutdown or an emergency shutdown occurs during the detection.
9. The method according to any one of claims 2 to 5, wherein the first preset threshold is 10kpa to 15kap or the second preset threshold is 5kpa to 8kpa.
10. The method according to any one of claims 1 to 6, wherein the preset time is 15s or less, or wherein the detection pressure is in a range of 150kpa to 180kpa.
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| CN202210973132.7A CN115172820A (en) | 2022-08-15 | 2022-08-15 | Hydrogen leakage detection method |
| PCT/CN2022/141849 WO2024036859A1 (en) | 2022-08-15 | 2022-12-26 | Hydrogen leakage detection method |
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| CN202210973132.7A CN115172820A (en) | 2022-08-15 | 2022-08-15 | Hydrogen leakage detection method |
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| WO2024036859A1 (en) * | 2022-08-15 | 2024-02-22 | 上海重塑能源科技有限公司 | Hydrogen leakage detection method |
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| JP5007278B2 (en) * | 2008-06-19 | 2012-08-22 | 本田技研工業株式会社 | Gas leak diagnostic device and gas leak diagnostic method |
| JP5498901B2 (en) * | 2010-09-02 | 2014-05-21 | 本田技研工業株式会社 | Fuel cell membrane breakage detection method |
| JP6137128B2 (en) * | 2014-11-13 | 2017-05-31 | トヨタ自動車株式会社 | Method for detecting leakage of reaction gas of fuel cell and fuel cell system |
| DE102016011140A1 (en) * | 2016-09-15 | 2018-03-15 | Daimler Ag | Method for determining a hydrogen leak |
| CN115172820A (en) * | 2022-08-15 | 2022-10-11 | 上海重塑能源科技有限公司 | Hydrogen leakage detection method |
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2022
- 2022-08-15 CN CN202210973132.7A patent/CN115172820A/en active Pending
- 2022-12-26 WO PCT/CN2022/141849 patent/WO2024036859A1/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024036859A1 (en) * | 2022-08-15 | 2024-02-22 | 上海重塑能源科技有限公司 | Hydrogen leakage detection method |
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| Publication number | Publication date |
|---|---|
| WO2024036859A1 (en) | 2024-02-22 |
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