C2H6/C3H8影响CH4爆炸极限参数及动力学特性研究  

Study on effects of C2H6/C3H8 on explosion limits and chemical kinetics

作　　者：罗振敏 苏彬 王涛 程方明 LUO Zhenmin;SU Bin;WANG Tao;CHENG Fangming(School of Safety Science and Engineering,Xi’an University of Science and Technology,Xi’an 710054,Shaanxi,China;Shaanxi Engineering Research Center for Industrial Process Safety&Emergency Rescue,Xi’an 710054,Shaanxi,China;Shaanxi Key Laboratory of Prevention and Control of Coal Fire,Xi’an 710054,Shaanxi,China)

机构地区：[1]西安科技大学安全科学与工程学院,陕西西安710054 [2]陕西省工业过程安全与应急救援工程技术研究中心,陕西西安710054 [3]陕西省煤火灾害防治重点实验室,陕西西安710054

出　　处：《化工学报》2019年第9期3601-3610,共10页CIESC Journal

基　　金：国家重点研发计划项目(2017YFC0804702,2016YFC0800100);国家自然科学基金项目(51674193,51504190);陕西省自然科学基础研究计划联合基金项目(2019JLM-9);陕西省自然科学基础研究计划面上项目(2017JM5068,2018JM5152);陕西省重点研发计划(2017ZDCXL-GY-01-02-03)

摘　　要：为研究C2H6/C3H8对甲烷爆炸极限参数及动力学特性的影响,采用标准的可燃气体爆炸极限测定装置测定了不同配比的C2H6/C3H8混合气体对甲烷爆炸极限的影响规律,同时得出了氮气惰化条件下甲烷爆炸临界参数的变化规律。此外,利用Chemkin软件模拟了C2H6/C3H8混合气体对甲烷爆炸过程中中间产物浓度的影响情况,并进行了敏感性分析。结果表明,C2H6/C3H8的存在降低了甲烷的爆炸上下限,增大了甲烷的爆炸危险度;在氮气惰化过程中甲烷的爆炸上限下降,爆炸下限上升,最终爆炸上下限重合,重合点处甲烷浓度和氮气临界浓度均随C2H6/C3H8的添加而逐渐减小;此外,C2H6/C3H8混合气体使甲烷爆炸过程中CO和·H的生成量逐渐增大,而CO2、·O和·OH的生成量则有下降趋势,通过对爆炸过程中甲烷体积的敏感性分析,发现C2H6/C3H8的存在在某种程度上促进了甲烷爆炸。对比不同配比的C2H6/C3H8混合气体,发现C3H8含量越高,其对甲烷爆炸过程中相关参数的影响越大,这可为工矿企业的安全生产提供一定的理论依据。To study effects of C2H6/C3H8 on explosion limits and chemical kinetics,a standard test device was employed to investigate effects of C2H6/C3H8 on explosion limits of CH4 and determine the critical parameters of CH4 explosion.In addition,Chemkin software was used to simulate the influence of C2H6/C3H8 mixed gas on the concentration of intermediates during methane explosion,and sensitivity analysis was carried out.Results indicated that the presence of C2H6/C3H8 decreased the explosion limits of CH4 while increased its explosion risk.In the inerting process,the reducing upper explosion limit and the rising lower explosion limit of CH4 merged at the same point where the critical concentration of CH4 and N2 all gradually decreased with the addition of C2H6/C3H8.Moreover,the production of CO and·H gradually increased while that of CO2,·O and·OH declined after adding C2H6/C3H8. It is suggested that the addition of C2H6/C3H8 promoted CH4 explosion to some extend by sensitivityanalysis. By contrast, it is found that the higher content of C3H8 indicated the greater influence on the relatedparameters in the process of methane explosion, which can provide a certain theoretical basis for the safetyproduction of industrial and mining enterprises.

关 键 词：甲烷 爆炸 C2H6/C3H8混合气体 极限参数 动力学 敏感性分析 

分 类 号：TD712.7[矿业工程—矿井通风与安全]