Investigation On Strategy Of Fast Refueling And Consequence Of Leakage-Explosion Of High Pressure Hvdrogen In Hydrogen Station

In response to the increasingly serious energy shortage and environment pollution problems, hydrogen fuel cell vehicle is widely accepted as an important development direction for its clean and high efficient characteristics. Hydrogen refueling station is a necessary infrastructure in the commercial operation of hydrogen fuel cell vehicle (HFCV), its key technology and safety guarantee are of great significance in the promotion and utilization of HFCV. Unfortunately, there will be distinct temperature rise within the high pressure hydrogen tank during the refueling process, which may cause serious damage to vehicle hydrogen storage system. Besides, the leakage, diffusion, flammable and explosive feature of hydrogen should be taken into consideration in the construction of hydrogen refueling station.In this paper, security problems in hydrogen utilization and storage, such as high pressure hydrogen fast refueling strategy and leakage-explosion consequences forecasting are investigated through a systematic study.(1) A one-dimensional theoretical model of temperature rise during high pressure hydrogen fast refueling process has been established, which is based on heat production and dissipation mechanism. A real gas equation of state also has been conceded of. Quantitative calculation of heat production and dissipation mechanism is studied on type III and IV tanks.(2) Bsaed on the effects of ambient conditions and refueling parameters, a refueling strategy is made which is suitable for type III vehicle hydrogen storage system where hydrogen storage quality are 2-4 kg and 5-7 kg and the working pressure is 70 MPa. The strategy can improve the precooling temperature level, which is helpful to save equipment investment and energy consumption of precooling.(3) The whole process of 39 MPa high pressure hydrogen leakage from diffusion to ignition and explosion are simulated by three-dimensional CFD numerical simulation software FLACS. Quantitative analysis of the diffusion process and explosion consequences of flammable hydrogen gas cloud is studied.(4) The influence rules of different factors, such as wind speed, ambient temperature, ignition time and ignition position, on the explosion intensity and hazard distance have been explored. The determinants of explosion intensity and hazard distance have also been indicated.The work of this paper can provide guidance for selection of the parameters during fast refueling process of 70 MPa,type â…¢ vehicle hydrogen storage system, and offer necessary theory for quantified risk assessment of hydrogen station.