CN110823479A - Vehicle-mounted liquid hydrogen valve inner leakage detection device - Google Patents
Vehicle-mounted liquid hydrogen valve inner leakage detection device Download PDFInfo
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- CN110823479A CN110823479A CN201910908522.4A CN201910908522A CN110823479A CN 110823479 A CN110823479 A CN 110823479A CN 201910908522 A CN201910908522 A CN 201910908522A CN 110823479 A CN110823479 A CN 110823479A
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- liquid hydrogen
- low temperature
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2876—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for valves
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- General Physics & Mathematics (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention relates to a vehicle-mounted low-temperature internal leakage detection device for a liquid hydrogen valve, which belongs to the field of low-temperature valve leakage detection and consists of a pressurized gas cylinder, a liquid hydrogen storage tank, a liquid hydrogen pipeline, a discharge valve, a blow-off valve, an exhaust pipeline, an alcohol bubble counter and a digital flowmeter.
Description
Technical Field
The field of low-temperature internal leakage detection of vehicle-mounted liquid hydrogen valves.
Background
With the increasingly severe global climate environmental protection situation and the continuously increasing pressure on coping with climate change, hydrogen energy is concerned worldwide, and the reform of energy supply becomes a hot spot of current social political, economic and technical concerns. It is expected that by 2030, a global fuel cell passenger car will reach 1000 to 1500 thousands. Meanwhile, in order to meet the hydrogen requirement of a fuel cell vehicle, a hydrogen gas or liquid hydrogen bottle must be equipped, the storage amount of liquid hydrogen is far superior to that of a hydrogen gas bottle, the development trend of the vehicle-mounted hydrogen storage bottle is shown, correspondingly, a vehicle-mounted liquid hydrogen bottle valve and the quality of the vehicle-mounted liquid hydrogen bottle valve are necessarily emphasized, but liquid hydrogen belongs to flammable and explosive gas, if the sealing performance of the valve does not reach the standard, a large potential safety hazard exists, the vehicle-mounted liquid hydrogen bottle valve cannot be installed on the vehicle-mounted liquid hydrogen bottle, and in order to guarantee the sealing performance of the vehicle-mounted liquid hydrogen bottle. The invention discloses a method for detecting the low-temperature leakage of a liquid hydrogen valve, which is characterized in that the low-temperature leakage of the liquid hydrogen valve is detected in a liquid nitrogen temperature region at present, and the actual leakage condition under the liquid hydrogen working condition can not be truly reflected.
Disclosure of Invention
The invention relates to a vehicle-mounted low-temperature internal leakage detection device for a liquid hydrogen valve, which consists of a pressurized gas cylinder, a liquid hydrogen storage tank, a liquid hydrogen pipeline, a discharge valve, a blow-off valve, an exhaust pipeline, an alcohol bubble counter and a digital flowmeter.
The low-temperature inner leakage detection device is of a low-temperature-resistant explosion-proof structure and can finish the test of a liquid hydrogen temperature zone, and the medium adopted for valve leakage detection can be a normal-temperature medium and a low-temperature medium, including but not limited to liquid hydrogen and liquid nitrogen. The liquid hydrogen container may be any heat insulating form such as low temperature foaming or vacuum heat insulation.
The pressurized gas cylinder has the function of pressurizing the liquid hydrogen storage tank and can be a helium gas source or a hydrogen gas source in any form.
The discharge valve can be a single-wall valve and adopts a foaming mode for heat insulation, and can also be a vacuum valve and adopts a vacuum heat insulation mode, and the type of the discharge valve can be any operation mode such as a manual valve, a pneumatic valve, an electric valve and the like.
The flow monitoring may be by any form of alcohol, water or other liquid bubble counter. The digital flowmeter can be any principle digital flowmeter in any form such as a wet gas flowmeter, a differential pressure flowmeter and the like, and can meet the requirement of real-time monitoring or accumulative monitoring of micro gas quantity.
The liquid hydrogen pipeline can be in any heat insulation form such as vacuum heat insulation, low-temperature foaming and the like, has a certain inclination angle, and can be in any angle of 0-180 degrees. And the front end of the liquid hydrogen pipeline is provided with a blowing port and a blowing valve.
The rear end of the flowmeter is connected with a discharge pipeline, and the test medium can be discharged safely according to the situation and can also be connected with a recovery system for recovery.
The system valve can be a valve of any low-temperature area, including but not limited to valves of any functional structures such as a low-temperature ball valve, a low-temperature gate valve, a low-temperature stop valve, a low-temperature safety valve, a low-temperature check valve, a low-temperature butterfly valve, a low-temperature needle valve, a low-temperature throttle valve, a low-temperature pressure reducing valve and the like.
In the test process, after the system is completely purged and replaced in the test process, liquid hydrogen is added into a liquid hydrogen container, a helium gas source is used for pressurizing the liquid hydrogen container to the working pressure of the valve, then the discharge valve is opened, the leakage rate of the valve passing through the alcohol bubble counter and the digital flowmeter is measured under the condition that the tested valve is closed, the purge valve is required to be opened according to the condition in the test process, and the fact that the valve does not contain a gas-liquid mixture is ensured.
The vehicle-mounted liquid hydrogen valve inner leakage detection device can detect not only a vehicle-mounted liquid hydrogen valve, but also any type of valve in any temperature area by the method, and accordingly a proper pressurization gas source needs to be considered.
Drawings
FIG. 1 is a schematic structural diagram of the present invention. Wherein, figure 1 is a helium bottle, figure 2 is a liquid hydrogen container, figure 3 is a discharge valve, figure 4 is a blow-off valve, figure 5 is a liquid hydrogen pipeline, figure 7 is a discharge pipeline, figure 8 is an alcohol bubble counter, and figure 9 is a digital flow meter.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail by taking fig. 1 as an example. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention detects the inner leakage performance of the vehicle-mounted liquid hydrogen valve 6, and the following working steps are carried out after the system is built, and the specific content is as follows
1) And (3) purging and replacing the system by using nitrogen and hydrogen successively, replacing the container with a hydrogen environment, and closing the discharge valve 3, the tested valve 7 and the blow-off valve 4 after replacement is finished.
2) Liquid hydrogen is added into the liquid hydrogen container 2, a filling port is arranged at the top of the liquid hydrogen container, and a certain amount of liquid hydrogen can be filled into the container by using a fixed storage tank and a fixed transmission pipeline or a liquid hydrogen tank car.
3) And opening the discharge valve to enable the liquid hydrogen in the liquid hydrogen container to flow to the liquid hydrogen pipeline 5 and the tested valve 6, and closing the tested valve. The liquid hydrogen in the liquid hydrogen pipeline is not ensured, and the blowing opening can be opened to discharge the hydrogen.
4) The readings of the alcohol bubble counter and the digital flowmeter are observed and recorded while the discharge valve is opened, and the instantaneous leakage and the accumulated leakage in a certain time are recorded.
5) If more liquid hydrogen exists after the test is finished, the liquid hydrogen can be transferred to a fixed storage tank or a tank car in a helium pressurization mode.
Claims (12)
1. The vehicle-mounted liquid hydrogen valve internal leakage detection device is composed of a pressurization gas cylinder, a liquid hydrogen container, a discharge valve, a blow-off valve, a liquid hydrogen pipeline, an exhaust pipeline, an alcohol bubble counter and a digital flowmeter.
2. The low-temperature internal leakage detection device of claim 1 is a low-temperature resistant structure, and can complete the liquid hydrogen temperature zone test, and the medium used for valve leakage detection can be a medium with normal temperature and low temperature, including but not limited to liquid hydrogen and liquid nitrogen.
3. The low temperature detector according to claim 1, wherein the liquid hydrogen container may be any heat insulating type such as low temperature foaming or vacuum heat insulation.
4. The low temperature internal leakage detection device of claim 1, wherein the pressurized gas cylinder is used for pressurizing a liquid hydrogen storage tank, and can be any helium gas source or hydrogen gas source.
5. The low temperature internal leakage detection device as claimed in claim 1, wherein the discharge valve is a single wall valve, and is insulated by foaming, or a vacuum valve is insulated by vacuum, and can be any operation form such as manual valve, pneumatic valve, electric valve, etc.
6. The low temperature internal leakage detection device of claim 1, wherein the flow monitoring is performed by any type of alcohol, water or other liquid bubble counter.
7. The vehicle-mounted liquid hydrogen valve internal leakage detection device as claimed in claim 1, wherein the digital flowmeter can be any principle digital flowmeter which can meet the requirements of real-time monitoring or accumulative monitoring of micro-gas amount, can be any form such as a wet gas flowmeter and a differential pressure flowmeter.
8. The vehicle-mounted liquid hydrogen valve internal leakage detection device as claimed in claim 1, wherein the liquid hydrogen pipeline can be in any heat insulation form such as vacuum heat insulation and low-temperature foaming, has a certain inclination angle, and can be in any angle of 0-180 degrees.
9. The device for detecting the internal leakage of the vehicle-mounted liquid hydrogen valve as claimed in claim 1, wherein a blow-off port and a blow-off valve are arranged at the front end of the liquid hydrogen pipeline.
10. The device for detecting the leakage in the vehicle-mounted liquid hydrogen valve as claimed in claim 1, wherein the rear end of the flow meter is connected with a discharge pipeline, and a test medium can be discharged safely according to conditions and can also be connected with a recovery system for recovery.
11. The vehicle-mounted liquid hydrogen valve internal leakage detection device as claimed in claim 1, wherein the system valve can be any valve in a low temperature region, including but not limited to valves in any functional structures such as a low temperature ball valve, a low temperature gate valve, a low temperature stop valve, a low temperature safety valve, a low temperature check valve, a low temperature butterfly valve, a low temperature needle valve, a low temperature throttle valve, a low temperature pressure reducing valve, and the like.
12. The device for detecting the internal leakage of the vehicle-mounted liquid hydrogen valve as claimed in claim 1 not only can detect the vehicle-mounted liquid hydrogen valve, but also can detect any type of valve in any temperature zone by the method, and accordingly, a proper pressurized gas source needs to be considered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910908522.4A CN110823479A (en) | 2019-09-25 | 2019-09-25 | Vehicle-mounted liquid hydrogen valve inner leakage detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910908522.4A CN110823479A (en) | 2019-09-25 | 2019-09-25 | Vehicle-mounted liquid hydrogen valve inner leakage detection device |
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| Publication Number | Publication Date |
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| CN110823479A true CN110823479A (en) | 2020-02-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910908522.4A Pending CN110823479A (en) | 2019-09-25 | 2019-09-25 | Vehicle-mounted liquid hydrogen valve inner leakage detection device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113984292A (en) * | 2021-09-30 | 2022-01-28 | 北京航天试验技术研究所 | Liquid hydrogen valve leakage detection device and method |
| CN117516978A (en) * | 2024-01-08 | 2024-02-06 | 未势能源科技有限公司 | Vehicle-mounted liquid hydrogen system testing device and control method thereof |
-
2019
- 2019-09-25 CN CN201910908522.4A patent/CN110823479A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113984292A (en) * | 2021-09-30 | 2022-01-28 | 北京航天试验技术研究所 | Liquid hydrogen valve leakage detection device and method |
| CN113984292B (en) * | 2021-09-30 | 2024-02-09 | 北京航天试验技术研究所 | Liquid hydrogen valve leakage detection device and method |
| CN117516978A (en) * | 2024-01-08 | 2024-02-06 | 未势能源科技有限公司 | Vehicle-mounted liquid hydrogen system testing device and control method thereof |
| CN117516978B (en) * | 2024-01-08 | 2024-03-12 | 未势能源科技有限公司 | Vehicle-mounted liquid hydrogen system testing device and control method thereof |
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