Safety Tests And Simulation Of Leakage And Explosion Of Low Pressure Hydrogen Storage Device For Light-duty Hydrogen Fuel Cell Vehicles

In order to cope with the increasingly serious energy shortage and environmental pollution problems in the city, clean and efficient hydrogen cars are more appreciated. Due to our country’s urban density, large population, the city traffic congestion, so the application prospect of light and flexible small fuel cell vehicle is very broad. Especially in China’s Taiwan Province, small hydrogen fuel cell vehicles have been in mass production and demonstration operation. However, due to the combustibilityandexplosibilityof hydrogen,the safety of the hydrogen storage device of small fuel cell vehicles has attracted public attention, but at present, there is still a lack of uniform safety test requirements for the device. To guarantee the safe operation of small hydrogen fuel cell vehicles, the safety test of low pressure hydrogen storage device and the numerical simulation and analysis of explosion behaviors and consequences are carried out. The main research contents are as follows:(1) Set uptest method for low pressure hydrogen storage devices for small fuel cell vehicles:identifyand analysis the risk factors in the whole life cycle of a low pressure hydrogen storage device for small fuel cell vehicles,comprehensive analysis of other standards for solid state hydrogen storage device at the present stage,system test methodsare established.(2) Design and build a hydrogen cycle test device,air tightness test, high temperature test, blasting test and hydrogen cycle test on low pressure hydrogen storage devices in Taiwan are carried out. The effects of hydrogen filling pressure and temperature on the hydrogen absorption and desorption process are analyzed. Cycle test of hydrogen storage devices with different placement positions is carried out, sothe influence of different positions on the surface strain of the storage tank is obtained. Through measuring the strain of storage tank with different measuring points, get the law of the distribution and variation of the strain in a certain number of cycles. Study the accuracy and sensitivity of three kinds of air tightness test method:bubble leak detection liquid leak detection method, hydrogen sensor detection method, helium mass spectrometer leak detection method, then set up the air tightness detection method for factory inspection and type test. Through the high temperature test and blasting test, combing the key test parameters.(3) The gas exchange station model of ventilation station is established by using CFD numerical simulation software FLACS. Simulation study of the whole process of leakage and explosion of low pressure hydrogen storage device is carried out. Quantitative analysis of the diffusion processand explosion consequences of flammable hydrogen gas cloud is studied.(4) The influencerules of different factors, such as wind speed, number of low pressure hydrogen storage devices, place position andpressure relief plate, on the explosion intensity and hazard distance have been explored.The research results of this paper can provide technical guidance for the safe operation of small fuel cell vehicle and thegas exchange station. And provide technical support for thenational standard Safety test method for low pressure hydrogen storage device for small fuel cell vehicle wehich is being developed.