CO2与N2对筒仓混煤低温自燃与爆炸的抑制作用  

Inhibition effect of CO2 and N2 on the explosion and spontaneous combustion performance of silo mixed coal

作　　者：欧盛南 刘建国[1,2] 金龙哲[1,2] 孙振超[1] OU Shennan;LIU Jianguo;JIN Longzhe;SUN Zhenchao(School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;Key Laboratory of High-efficient Mining and Safety of Metal Mines of the Ministry of Education,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学土木与资源工程学院,北京100083 [2]北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083

出　　处：《中国矿业大学学报》2020年第2期387-394,共8页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(51574017,51874015);“十三五”科技部重点研发计划项目(2017YFC0805204)。

摘　　要：为研究CO2与N2对筒仓混煤低温自燃与爆炸的抑制特性,利用程序升温装置与20 L球形爆炸装置,分别对黄骅港筒仓混煤在空气、CO2及N2气氛下(φO2=10%)的低温自燃与爆炸特性进行实验.通过分析混煤自燃标志性气体产生(消耗)速率与爆炸严重度参数变化规律,对比研究了CO2与N2对混煤低温自燃与爆炸性能的抑制作用与机理.结果表明:混煤在CO2与N2气氛下的最大爆炸压力(pmax)较空气气氛分别下降了61.02%,38.98%;火焰生长时间(τ)分别增加了7.73,1.11倍,爆炸严重度显著降低;在混煤低温自燃阶段,相比于空气气氛,混煤在CO2和N2气氛下的耗氧速率分别平均下降了62.21%,45.08%,CO产生速率分别平均下降了41.72%,23.48%,CH4产生速率分别平均下降了28.97%,17.14%,相比于N2,CO2对混煤低温自燃与爆炸性均具有更强的抑制性;基于此,从微观分子角度总结提出惰性气体对混煤的"三步"抑自燃机理,该机理较好地解释了CO2在抑制混煤低温自燃过程中的优越性.In order to study the suppression characteristics of CO2 and N2 on low temperature spontaneous combustion(LTSC)and explosion of silo mixed coal,the LTSC and explosion characteristics of Huanghua Port silo mixed coal were measured in air,N2 and CO2 atmosphere(10 Vol.%O2)using temperature programmed device and 20 L spherical explosive vessel.Based on the analysis of the production or consumption rate of variation gas and the explosion severity parameters of mixed coal,the inhibitory effect and mechanism of CO2 and N2 on the explosion and LTSC performance of mixed coal were studied.The results show that compared with in air atmosphere,the maximum explosion pressures pmax in CO2 and N2 atmosphere decreased by 61.02%and 38.98%,and the flame growth timeτincreased by 7.73 and 1.11 times,respectively.The explosion severity decreased significantly.In the LTSC stage of mixed coal,compared with in air atmosphere,the oxygen consumption rates,the production rates of CO and CH4 of mixed coal in CO2 and N2 atmosphere decreased by 62.21%,45.08%,and 41.72%,23.48%,and 28.97%,17.14%,respectively.Therefore,CO2 has a stronger inhibitory effect on the LTSC of mixed coal.Based on this,the"three-step"anti-spontaneous combustion mechanism of inert gas to mixed coal was summarized from the view of micromolecules,which well explained the superiority suppressing ability of CO2 for the LTSC characteristics of mixed coal.

关 键 词：煤自燃 爆炸 惰性气体 抑爆 筒仓煤 

分 类 号：X932[环境科学与工程—安全科学]