China Safety Science Journal ›› 2019, Vol. 29 ›› Issue (9): 102-106.doi: 10.16265/j.cnki.issn1003-3033.2019.09.016

• Safety Science of Engineering and Technology • Previous Articles     Next Articles

Research on minimum explosible concentration of dust based on method of combustion duration

TAN Xin1, ZHAO Peng1, WU Dejian1, HUANG Weixing1, YUAN Jingjie2   

  1. 1 School of Chemical Engineering,Sichuan University,Chengdu Sichuan 610065,China;
    2 Research Center for Mechanical and Electrical Equipment Testing, Chongqing Special Equipment Inspection and Research Institute,Chongqing 401121,China
  • Received:2019-05-25 Revised:2019-07-22 Online:2019-09-28 Published:2020-10-30

Abstract: To improve the reliability of MEC tests, a method of measuring MEC by combustion duration was proposed. Through theoretical analysis of the relationship between the flame propagation rate and dust concentration, systematical experiments were performed in the 20 L sphere vessel to investigate the basic variation behavior of combustion duration under different ignition energy, particle size and dust concentration. The feasibility of the combustion duration method was verified by MEC experimental results. The results show that the combustion duration time essentially characterizes explosive dynamics features and the concentration at the maximum of combustion duration time is MEC, and that the results of MEC determined by this proposed combustion duration method are in good agrement with those obtained by current pressure-benchmarked test method, but the proposed method is more stable and accurate.

Key words: dust explosion, combustion duration time, minimum explosible concentration(MEC), test technology, flame propagation rate

CLC Number: