5.1安全工程科技英语.pdfVIP

Self-ignition and explosion during discharge of high-pressure hydrogen BY Toshio Mogi, ET AL Chen Dongliang (陈东梁) Email：chendl@mail.buct.edu.cn College of Mechanical and Electrical Engineering Beijing University of Chemical Technology (BUCT) INFORMATIONS FOR THE PAPER -2- Abstract The phenomenon of self-ignition and explosion during discharge of high-pressure hydrogen was investigated. To clarify the ignition conditions of high-pressure hydrogen jets, rapid discharge of the high-pressure hydrogen was examined experimentally. A diaphragm隔膜was used to allow rapid discharge of the high-pressure hydrogen. The burst pressure was varied from 4 to 30 MPa. The downstream geometry of the diaphragm was a flange and extension pipes, with the pipe length varying from 3 to 300 mm. The diameter of the nozzle喷嘴was 5 or 10 mm. When short pipes were used, the hydrogen jet did not ignite. However, the hydrogen jet showed an increasing tendency to ignite in the pipe as the length of the pipe became longer. At higher burst pressures, a diffusion jet flame was formed from the pipe. The blast wave from the fireball formed on self-ignition of the hydrogen jet resulted in an extremely rapid pressure rise. -3- 1. Introduction Hydrogen is clean energy carrier, and the development of hydrogen- fueled vehicles is advancing rapidly. However, for energy-efficient use of fuel-cell vehicles, safe handling of high-pressure hydrogen storage vessels and piping is required. Hydrogen has an ignition energy as low as 0.019 mJ(mili-joule), and a wide flammability range in air (4–75% by volume of hydrogen). Early implementation of safety mea