Experimental Study of Influence Factors on H2-Air Explosion in Linked Vessels
Recently, the Chinese govemment has enacted the fourteenth five-year program.The program indicates that the hydrogen energy is supposed to the top quality energy source throughout the world.Compared with the traditional energy, the hydrogen energy has the characteristic of high heat value, good heat conductivity, good combustion performance, clean and contamination-free.In the process industry, closed vessels and pipes are usually used to store and transport flammable gas.However, many inescapable factors result in a gas leak and consequently a gas explosion accident will happen.Therefore, to study the gas explosion in vessel or pipe is very meaningful.The experimental system is made up of explosion apparatus, ignition apparatus, pressure transducer, data acquisition device, distribution system and a vacuum circulating pump.The influence factors on H2-air mixtures explosion were studied in linked vessels with two spherical vessels of 600 mm and 350 mm diameter respectively and pipe of 60 mm diameter.Experiment was carried out at normal temperature and atmospheric pressure.The influence of ignition position, initial pressure and pipe length on pressure are analyzed in linked vessels.Before each experiment, the vacuum pump was used to get the air pressure in the linked vessels at-0.09 Mpa, then to inflate hydrogen-air mixture as required.In order to establish the repeatability of experiments, each experiment is repeated three times.The ignition energy is 5 J in this research.The experimental results show that the different ignition position has less impact on the maximum hydrogen explosion pressure in large vessel, however, the impact on the maximum hydrogen explosion pressure in small vessel and the maximum hydrogen explosion rising rate in linked vessels is obvious.The initial pressure has a distinct effect on the maximum hydrogen explosion pressure in linked vessels.In large vessel, the maximum hydrogen explosion pressure increases with the increasing of initial pressure nearly liner relationship.In small vessel, the maximum hydrogen explosion pressure also increases with the increasing of initial pressure.Moreover, the maximum hydrogen explosion pressure has a sharp increase firom 0.02 Mpa to 0.03 Mpa.When the ignition position is in large vessel, the maximum hydrogen explosion pressures are all increase with the pipe length.Meanwhile, the change of the maximum hydrogen explosion pressure in small vessel is more severe than in large vessel.When the ignition position is in small vessel, the maximum hydrogen explosion pressure in large vessel increases with the pipe length.However, the maximum hydrogen explosion pressure in small vessel increases first then decreases.The maximum hydrogen explosion pressure, the maximum rates of pressure rise and the time delay between ignition in the large and small vessel are discussed.
linked vessel hydrogen ignition position initial pressure size effect
ZHANG Kai WANG Zhirong LIU Minghan
College of Safety Science and Engineering, Nanjing Tech University, Nanjing 210009, Jiangsu, China
国际会议
The 2016 International Symposium on Safety Science and Technology(2016安全科学与技术国际会议)
昆明
英文
577-583
2016-10-17（万方平台首次上网日期，不代表论文的发表时间）