Secondary Explosion Characteristics and Chemical Kinetics of CH4/Air Induced by a High-Temperature Surface

IF 2.9 Q2 PUBLIC, ENVIRONMENTAL & OCCUPATIONAL HEALTH
Haiyan Wang, Lei Zhang*, Na Wei, Jia Wang, Jun Hu, Sheng He, Jia Zhang and Jiale Zhang, 
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引用次数: 0

Abstract

The gas explosion induced by the high-temperature surface of coal spontaneous combustion in goaf will cause a devastating blow to personnel and equipment in the process of coal mining. Secondary explosion may be induced by the high-temperature surface of coal spontaneous combustion after primary explosion with the continuous emission of gas and the ventilation of goaf. This will lead to new disasters for the ongoingrescue operation. A high-temperature source explosion experimental system consistent with the similarity and unity of goaf was designed and developed based on the similarity criterion in this study. A CH4/air explosion experiment was carried out with the high-temperature surface as an ignition source. The characteristics of secondary explosion were studied, and chemical kinetics was analyzed. It is of great significance to the safety of the process of mining production. The results show that the secondary explosion limit (6.5–14%) is less than the primary explosion (5.5–14.5%). Its explosion risk (F) is reduced by 15.6%. The key parameters Pmax, Tmax, and (dP/dt)max of secondary explosion at each concentration are lower than those of primary explosion. The te of secondary explosion is higher than primary explosion. The most dangerous concentration of primary and secondary explosions induced by the high-temperature surface is 11.5%. Carbon oxides (CO2 and CO) and C2 hydrocarbon gases (C2H2, C2H4, and C2H6) are generated after primary explosion. The chemical kinetics of secondary explosion was analyzed with CHEMKIN Pro 2021. When the CH4 concentration is <11.5%, the formation of the key free radicals ·H, ·O, ·OH, and CH2O is inhibited due to the formation of CO2. When the CH4 concentration is ≥11.5%, the formation of the key free radicals ·H, ·O, ·OH, and CH2O is inhibited due to the generation of combustible gases (C2H2, C2H4, C2H6, and CO) and inert gas (CO2). As a result, the limit range of secondary explosion and the explosion hazard characteristics are reduced. R156 and R158 played major roles in the process of secondary explosion with the analysis of reaction sensitivity.

Abstract Image

CH4/空气高温表面二次爆炸特性及化学动力学
采空区煤自燃的高温表面引发的瓦斯爆炸,将对煤矿开采过程中的人员和设备造成毁灭性打击。二次爆炸可能是由于一次爆炸后煤的高温表面自燃,伴随着瓦斯的持续排放和采空区的通风而引起的。这将给正在进行的探险行动带来新的灾难。基于相似性准则,设计开发了一套符合采空区相似性和统一性的高温源爆实验系统。以高温表面为点火源,进行了CH4/空气爆炸实验。对二次爆炸的特点进行了研究,并对其化学动力学进行了分析。它对矿山生产过程的安全具有重要意义。结果表明,二次爆炸极限(6.5~14%)小于一次爆炸极限值(5.5~14.5%),爆炸危险性(F)降低15.6%,各浓度二次爆炸的关键参数Pmax、Tmax和(dP/dt)max均低于一次爆炸。二次爆炸的te高于一次爆炸。高温表面引发的一次和二次爆炸的最危险浓度为11.5%。一次爆炸后产生碳氧化物(CO2和CO)和C2烃类气体(C2H2、C2H4和C2H6)。利用CHEMKIN Pro 2021对二次爆炸的化学动力学进行了分析。当CH4浓度<;11.5%,由于CO2的形成,关键自由基·H、·O、·OH和CH2O的形成受到抑制。当CH4浓度≥11.5%时,由于可燃气体(C2H2、C2H4、C2H6和CO)和惰性气体(CO2)的产生,关键自由基·H、·O、·OH和CH2O的形成受到抑制。因此,减小了二次爆炸的极限范围和爆炸危险特性。反应灵敏度分析表明,R156和R158在二次爆炸过程中起主要作用。
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来源期刊
ACS Chemical Health & Safety
ACS Chemical Health & Safety PUBLIC, ENVIRONMENTAL & OCCUPATIONAL HEALTH-
CiteScore
3.10
自引率
20.00%
发文量
63
期刊介绍: The Journal of Chemical Health and Safety focuses on news, information, and ideas relating to issues and advances in chemical health and safety. The Journal of Chemical Health and Safety covers up-to-the minute, in-depth views of safety issues ranging from OSHA and EPA regulations to the safe handling of hazardous waste, from the latest innovations in effective chemical hygiene practices to the courts'' most recent rulings on safety-related lawsuits. The Journal of Chemical Health and Safety presents real-world information that health, safety and environmental professionals and others responsible for the safety of their workplaces can put to use right away, identifying potential and developing safety concerns before they do real harm.
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