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Hydrogen leakage in-situ detection method for hydrogen refueling station

An in-situ detection, hydrogen refueling station technology, applied in the direction of detecting the appearance of fluid at the leak point, using liquid/vacuum degree for liquid tightness measurement, etc., can solve the problem of rapid concentration drop, high installation and maintenance costs, and impact Sensor detection sensitivity and other issues, to achieve the effects of low production cost, improved rescue speed, and high promotion and use value

Pending Publication Date: 2022-02-11
BEIJING INST OF AEROSPACE TESTING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method cannot locate the leakage point; in the large-volume and high-flow gas storage equipment of the hydrogen refueling station, local leakage is difficult to cause significant changes in the pressure consumption in the system, making this method unable to realize the location of the hydrogen Effective monitoring of leaks
Gas concentration sensors use sensing elements to generate electrical signals to indicate the presence of gases, but their installation and maintenance costs are high
In addition, in outdoor environments such as hydrogen refueling stations, the characteristics of easy diffusion of gas will cause the concentration around the leak point to drop rapidly, affecting the detection sensitivity of the sensor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Clean the welding seam of the hydrogen pipeline of the hydrogen refueling station, the valve stem and the flange, cut off the required length of hydrogen leakage detection tape, stretch it properly, and keep the proper elasticity for sequential overlapping and winding. Press for 2-3 seconds until the contact surface of the body is completely bonded without gaps. After the hydrogen refueling station is in normal operation, staff members are sent to regularly inspect the potential hydrogen leakage locations pasted with hydrogen leakage detection tape. After a period of time, it was found that the tape pasted on the weld of a pipeline turned light blue, and it was confirmed that there was a slight leak here.

Embodiment 2

[0018] Clean the outlet of the hydrogen compressor of the hydrogen refueling station and the internal pipeline of the hydrogen refueling machine, cut the required length of hydrogen leak detection tape, stretch it properly, keep the proper elasticity, and wrap it sequentially, and press hard for 2- 3 seconds, until the contact surface of the body is completely bonded without gaps, and an internal camera is installed for observation. After a period of normal operation of the hydrogen refueling station, through the internal camera observation, it was found that the tape pasted on a pipeline at the outlet of the compressor turned blue, and it was confirmed that there was a leak here.

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PUM

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Abstract

The invention relates to a hydrogen leakage in-situ detection method for a hydrogen refueling station, in particular to a color-changing adhesive tape type hydrogen leakage in-situ detection method. Potential hydrogen leakage positions such as a hydrogen conveying system, a hydrogen storage system, hydrogen compression equipment, a hydrogen filling machine, a gas discharging column, a pressure detection device and pipeline joints, valves, flanges and welding seams of various sensors in the hydrogen filling station are coated with the adhesive tape, whether leakage occurs or not is judged by observing whether the color of the adhesive tape changes or not, and the specific position of a leakage point is determined.

Description

technical field [0001] The invention relates to an in-situ detection method for hydrogen leakage used in a hydrogen refueling station, in particular to an in-situ detection method for hydrogen leakage in the form of a color-changing adhesive tape. Background technique [0002] Hydrogen plays an important role in the national economy. Hydrogen is flammable and easy to leak, which can cause explosion, fire and other hazards after leakage. Therefore, in the storage and transportation of hydrogen, it is necessary to pay close attention to the occurrence and prevention of leakage. [0003] Currently commonly used hydrogen leak detection methods include pressure / consumption monitoring, gas concentration sensors, etc. Pressure / consumption monitoring uses abnormal changes in vessel pressure or gas flow to indicate a leak. However, this method cannot locate the leakage point; in the large-volume and high-flow gas storage equipment of the hydrogen refueling station, local leakage i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M3/04
CPCG01M3/04
Inventor 孟醒徐林楠李俊钟秋赵坦毛亚南张旭贾月方涛
Owner BEIJING INST OF AEROSPACE TESTING TECH