燃烧持续时间法测试粉尘爆炸下限的试验研究  

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

作　　者：谭鑫 赵鹏[1] 吴徳建 黄卫星[1] 袁旌杰 TAN Xin;ZHAO Peng;WU Dejian;HUANG Weixing;YUAN Jingjie(School of Chemical Engineering,Sichuan University,Chengdu Sichuan 610065,China;Research Center for Mechanical and Electrical Equipment Testing,Chongqing Special Equipment Inspection and Research Institute,Chongqing 401121,China)

机构地区：[1]四川大学化学工程学院,四川成都610065 [2]重庆市特种设备检测研究院机电设备试验研究中心,重庆401121

出　　处：《中国安全科学学报》2019年第9期102-106,共5页China Safety Science Journal

摘　　要：为提高粉尘爆炸下限浓度(MEC)测试的可靠性,提出基于燃烧持续时间法的测试方法。在理论分析粉尘火焰传播速度与粉尘浓度关系的基础上,利用20 L爆炸球开展试验,研究燃烧持续时间在不同点火能量、粉尘粒径、粉尘浓度条件下的基本变化特征,并对比以燃烧持续时间与爆炸压力为判据获得的MEC的试验结果,验证以燃烧持续时间法测试MEC的可行性。结果表明:燃烧持续时间本质上表征爆炸动力学特征,其低浓度下的最大值对应的浓度即粉尘MEC;利用燃烧持续时间法判断得到的可燃粉尘MEC与现行压力基准测试方法的结果具有较好的一致性,且该方法稳定性更好、试验结果更准确。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.

关 键 词：粉尘爆炸 燃烧持续时间 爆炸下限浓度(MEC) 测试技术 火焰传播速度 

分 类 号：X932[环境科学与工程—安全科学]