Vehicle-mounted hydrogen storage cylinder service monitoring device and method based on optical fiber sensing

Abstract

The invention provides a vehicle-mounted hydrogen storage cylinder service monitoring device and method based on optical fiber sensing. An optical fiber grating is wound on a hydrogen storage cylinder, and a strain sensor is arranged on the hydrogen storage cylinder; double deformation signals of inflation deformation of an inner container of the hydrogen storage cylinder and deformation of a composite material structure of the hydrogen storage cylinder are sensed, demodulated and analyzed by connecting a hydrogenation gun with an optical fiber flange, the stress-strain condition of the hydrogen storage cylinder is monitored in real time, and the fatigue damage structure of the hydrogen storage cylinder is identified and positioned through inversion; and data are further compared and confirmed in combination with a big data cloud platform analysis technology, so that the function of monitoring the stress state of the vehicle-mounted hydrogen storage cylinder in real time is realized, effective protection measures can be conveniently taken in time, the safety and reliability of the hydrogen storage cylinder are ensured, and the real-time monitoring and early warning functions of the vehicle-mounted hydrogen storage cylinder are comprehensively realized.

Description

technical field [0001] The invention belongs to the technical field of real-time monitoring of vehicle-mounted hydrogen storage cylinders, and in particular relates to a device and method for in-service monitoring of vehicle-mounted hydrogen storage cylinders based on optical fiber sensing. Background technique [0002] China's automotive hydrogen energy industry is in the rapid start stage. However, compared with the rapid development of fuel cell vehicles, hydrogen refueling stations and related industries, my country's systematic research on hydrogen energy utilization safety technology is relatively scarce, lagging behind the actual needs of industrial development , does not yet have the ability to support the healthy and rapid development of the industry. First, the research foundation of my country’s hydrogen energy safety technology is weak. The research on hydrogen energy safety technology mainly focuses on basic fields such as hydrogen fuel cell safety, hydrogen beha...

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Problems solved by technology

[0002] China's automotive hydrogen energy industry is in the rapid start stage. However, compared with the rapid development of fuel cell vehicles, hydrogen refueling stations and related industries, my country's systematic research on hydrogen energy utilization safety technology is relatively scarce, lagging behind the actual needs of industrial development , does not yet have the ability to support the healthy and rapid development of the industry

First, the research foundation of my country’s hydrogen energy safety technology is weak. The research on hydrogen energy safety technology mainly focuses on basic fields such as hydrogen fuel cell safety, hydrogen behavior, and material compatibility of hydrogen-related equipment. The research strength is scattered and the depth is insufficient. There is a lack of safety and reliability testing methods and testing and certification methods for materials and components, fuel cell safety, vehicle safety, and hydrogen storage tank safety research cannot cover all accident scenarios in the actual application process, and hydrogen refueling station safety technology research is close to blank

Second, my country does not have the industrialization capability of hydrogen supply system equipment commonly used abroad, and the related safety technology research is in a blank state

The 35MPa hydrogen supply pressure greatly reduces the mileage of hydrogen vehicles and increases the storage and transportation costs of hydrogen

The working principle of the strain electrical measurement method is to use the strain effect of the resistance to measure the gas cylinder. The requirements for the environment are relatively good. Defects inside and on the surface of the gas cylinder body, but acoustic emission is susceptible to environmental interference and cannot meet the stress state monitoring during gas cylinder operation; the working principle of ultrasonic stress technology is mainly to use ultrasonic waves to achieve stress measurement of gas cylinders, which can be measured The residual stress, working stress, and surface stress of the gas cylinder, but because this monitoring technology cannot achieve real-time and online monitoring, it cannot meet the real-time stress state monitoring of the vehicle

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