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Intrinsically safe scanning type optical hydrogen leakage monitoring method

An intrinsically safe, scanning technology that can be used in the measurement of phase influence characteristics, by detecting the appearance of fluid at the leak point, and using liquid/vacuum for liquid tightness measurement, which can solve the problem of untargeted and insufficient leakage detection. Good and other problems, to achieve the effect of simple detection and safe detection method

Inactive Publication Date: 2021-03-09
BEIJING UNIV OF TECH
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Problems solved by technology

[0005] It can be seen from the above table that the hydrogen sensor has various designs, but it is not targeted, and the effect of leak detection in the hydrogen storage and transportation process is not good enough.

Method used

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  • Intrinsically safe scanning type optical hydrogen leakage monitoring method
  • Intrinsically safe scanning type optical hydrogen leakage monitoring method
  • Intrinsically safe scanning type optical hydrogen leakage monitoring method

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Embodiment Construction

[0016] When the high-pressure hydrogen storage tank leaks, a high-pressure hydrogen jet will be formed and mixed with the surrounding air to form a complex mixed airflow, which remains at a high flow rate after passing through the Mach disk. The high-pressure hydrogen jet can be regarded as a pressure of 70Mpa (the pressure of the high-pressure hydrogen storage tank on a general hydrogen energy vehicle is 70MPa [37] ) of cylindrical prisms. At the leakage port, the pressure of the high-pressure hydrogen jet is as high as 70 MPa. Because of the high pressure, the density of the high-pressure hydrogen jet is also relatively large, so the refractive index is also relatively large. According to the roughly linear correlation between the refractive index of air and the pressure, the refractive index of the air prism can be approximately estimated to be 1.19. At this time, when the light passes through the air prism, the refraction phenomenon will occur, and the refraction phenomen...

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Abstract

The invention discloses an intrinsically safe scanning type optical hydrogen leakage monitoring method, and belongs to the technical field of high-pressure hydrogen monitoring. Firstly, a laser sourceemits light to form parallel light, and the parallel light irradiates the surface of a to-be-hydrogen-stored tank; when high-pressure hydrogen in the hydrogen storage tank leaks, light can form a 132-degree fan-shaped emitting area, the CCD camera is used for photographing the fan-shaped emitting area and recording images of the fan-shaped emitting area, the recorded images are subjected to digital image processing, and the position and the size of a leakage opening are judged according to the processed images. When high-pressure hydrogen does not leak, parallel light can directly pass through the surface of an object to be measured, and no fan-shaped emission area exists in a picture shot by the CCD camera. The method is simple and convenient for detection, overcomes the possibility of lack of pertinence of general sensors, and is safer in the whole detection method.

Description

technical field [0001] The invention relates to a scanning optical hydrogen leakage monitoring method, which belongs to the technical field of high-pressure hydrogen monitoring. Background technique [0002] With the continuous growth of global energy demand and the increasingly serious problem of environmental pollution, the demand for new energy in countries around the world continues to increase. As an energy carrier, hydrogen is favored by countries all over the world for its advantages such as abundant resources, diverse sources, clean environmental protection, high calorific value, storability, and renewable. It is a next-generation strategic energy with great potential. Hydrogen energy can be widely used in various fields such as transportation, industrial production, and family life, and will surely become a core component of the future low-carbon clean energy system. Due to hydrogen's easy leakage and diffusion, wide flammable range, extremely low ignition energy, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M3/04G01N21/41
CPCG01M3/04G01N21/41
Inventor 苗扬李跃娟张筱璐陈茜王凯张蒙陈寅飞姚璐峤
Owner BEIJING UNIV OF TECH
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