C2H6/C3H8影响CH4爆炸极限参数及动力学特性研究

doi:10.11949/0438-1157.20190223

化工学报 ›› 2019, Vol. 70 ›› Issue (9): 3601-3615.DOI: 10.11949/0438-1157.20190223

• 过程安全 • 上一篇

C₂H₆/C₃H₈影响CH₄爆炸极限参数及动力学特性研究

罗振敏^1,^2,³(),苏彬^1,²(),王涛^1,²,程方明^1,^2,³

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

收稿日期:2019-03-11 修回日期:2019-06-09 出版日期:2019-09-05 发布日期:2019-09-05
通讯作者: 罗振敏,苏彬
作者简介:罗振敏（1976—），女，博士，教授，zmluo@xust.edu.cn
基金资助:
国家重点研发计划项目(2017YFC0804702);国家自然科学基金项目(51674193);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);陕西省重点研发计划(2017ZDCXL-GY-01-02-03)

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

Zhenmin LUO^1,^2,³(),Bin SU^1,²(),Tao WANG^1,²,Fangming CHENG^1,^2,³

1. School of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, Shaanxi, China
2. Shaanxi Engineering Research Center for Industrial Process Safety & Emergency Rescue, Xi’an 710054, Shaanxi, China
3. Shaanxi Key Laboratory of Prevention and Control of Coal Fire, Xi’an 710054, Shaanxi, China

Received:2019-03-11 Revised:2019-06-09 Online:2019-09-05 Published:2019-09-05
Contact: Zhenmin LUO,Bin SU

摘要/Abstract

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。

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

Abstract:

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 sensitivity analysis. By contrast, it is found that the higher content of C₃H₈ indicated the greater influence on the related parameters in the process of methane explosion, which can provide a certain theoretical basis for the safety production of industrial and mining enterprises.

Key words: methane, explosion, C₂H₆/C₃H₈ mixture, limiting parameters, kinetics, sensitivity analysis

中图分类号:

TD 712.7

罗振敏, 苏彬, 王涛, 程方明. C₂H₆/C₃H₈影响CH₄爆炸极限参数及动力学特性研究[J]. 化工学报, 2019, 70(9): 3601-3615.

Zhenmin LUO, Bin SU, Tao WANG, Fangming CHENG. Study on effects of C₂H₆/C₃H₈ on explosion limits and chemical kinetics[J]. CIESC Journal, 2019, 70(9): 3601-3615.

图/表 12

图1 气体爆炸极限测试装置

Fig.1 Device used for testing the mixture’s explosion limits

表1 混合气体配比情况

Table 1 Ratios of gas mixture

序号	C₂H₆/%(vol)	C₃H₈/%(vol)
配比1	0	0
配比2	100	0
配比3	75	25
配比4	50	50
配比5	0	100

表2 数值计算初始参数

Table 2 Initial parameters

序号	可燃气体/%(vol)	N₂/%(vol)	O₂/%(vol)	初始温度/K	初始压力/Pa	计算时间/s
工况1	9.5CH₄+2%配比1	71.495	19.005	1350	101325	0.02
工况2	9.5CH₄+2%配比2	69.915	18.585	1350	101325	0.02
工况3	9.5CH₄+2%配比3	69.915	18.585	1350	101325	0.02
工况4	9.5CH₄+2%配比4	69.915	18.585	1350	101325	0.02
工况5	9.5CH₄+2%配比5	69.915	18.585	1350	101325	0.02

图2 C2H6/C3H8对空气中CH4爆炸极限的影响

Fig.2 Effects of C2H6/C3H8 on explosion limits of CH4 in air

图3 C2H6/C3H8对空气中CH4爆炸危险度的影响

Fig.3 Effects of C2H6/C3H8 on explosive risk of CH4 in air

图4 惰化过程中CH4的爆炸极限变化规律

Fig.4 Changes of explosion limits of CH4 in inerting process

图5 惰化过程中CH4的爆炸危险度变化规律

Fig.5 Changes of explosive risk of CH4 in inerting process

图6 CH4爆炸极限汇合点变化规律

Fig.6 Changes of merging point of upper lower explosion limits of CH4

图7 C2H6/C3H8对N2惰化抑爆临界浓度的影响

Fig.7 Effects of C2H6/C3H8 on N2 critical concentration of explosion suppression

图8 甲烷爆炸过程中CO及CO2浓度变化规律

Fig.8 Changes of CO and CO2 concentrations in explosion process

图9 甲烷爆炸过程中关键自由基浓度变化规律

Fig.9 Changes of key radicals’ concentrations in explosion process

图10 C2H6/C3H8对CH4爆炸过程中甲烷体积变化的敏感性影响

Fig.10 Effects of C2H6/C3H8 on sensitivity of CH4 volume fraction variation

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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

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