Experimental Study on the Feasibility of Explosion Suppression by Vacuum Chambers
In view of the invalidity of suppression and isolation apparatus for gas explosion, a closed vacuum chamber structure for explosion suppression with a fragile plane was designed on the basis of the suction of vacuum. Using methane as combustible gas, a series of experiments on gas explosion were carried out to check the feasibility of the vacuum chamber suppressing explosion by changing methane concentration and geometric structure of the vacuum chamber. When the vacuum chamber was not connected to the tunnel, detonation would happen in the tunnel at methane volume fraction from 9.3％ to 11.5％, with flame propagation velocity exceeding 2000 m/s, maximum peak value overpressure reaching 0.7 MPa, and specific impulse of shock wave running up to 20 kPa·s. When the vacuum chamber with 5/34 of the tunnel volume was connected to the flank of the tunnel, gas explosion of the same concentration would greatly weaken with flame propagation velocity declining to about 200m/s, the quenching distance decreasing to 3/4 of the tunnel length, maximum peak value overpressure running down to 0.1～0.15 MPa and specific impulse of shock wave below 0.9 kPa-s. The closer the position accessed to the ignition end, the greater explosion intensity weakened. There was no significant difference between larger section and smaller vacuum chambers in degree of maximum peak value overpressure and specific impulse declining, except that quenching fire effect of the former was superior to the latter. The distance of fire quenching could be improved by increasing the number of the vacuum chambers.
vacuum chamber suction explosion suppression specific impulse overpressure-impulse guideline (P-I guideline)
Wu Zhengyan JIANG Shuguang SHAO Hao WANG Kai JU Xiaorui Zou Wei ZHANG Weiqing WANG Lanyun
School of Safety Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China School of Safety Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China
国际会议
The First International Symposium on Mine Safety Science and Engineering (首届矿山安全科学与工程学术会议)
北京
英文
1376-1387
2011-10-27（万方平台首次上网日期，不代表论文的发表时间）