基于定容燃烧弹的不同初始压力甲烷爆炸特性研究
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摘要
在工业生产现场中存在各种储罐,特别是在天然气柱罐区,天然气爆炸冲击波产生抛射物碎片形成多米诺骨牌效应。本文利用定容燃烧弹爆炸实验装置,通过设置不同初始压力、甲烷浓度条件,对不同初始压力下不同浓度甲烷爆炸特性进行了实验研究,结果表明初始压力增大,使甲烷-空气混合气的最大爆炸压力增大,爆炸危险性增加,初始压力对低浓度甲烷爆炸的最大压力影响最大;当量比浓度与爆炸下限之间的混合气体在初始压力增加时的正反馈效应,使当量比浓度与爆炸下限之间混合气体最大爆炸压力的增幅较当量比浓度与爆炸上限之间的增幅大,即当量比浓度与爆炸下限之间的混合气体较当量比浓度与爆炸上限之间的混合气体对初始压力更敏感。分析初始压力对甲烷爆炸传播的影响,对降低罐区甲烷爆炸事故的严重程度具有指导意义。
There are various storage tanks in the industrial production site,especially in the natural gas cylinder tank area. The natural gas explosion shock waves generate projectile debris and form a domino effect. In this paper,using a constant volume incendiary bomb explosion experimental device,by setting different initial pressures and methane concentration conditions,experimental studies were carried out on the different methane explosion characteristics under different initial pressures. The results show that the initial pressure increases and the maximum explosion of methane-air mixture is achieved. Increased pressure increases explosion risk.The initial pressure has the greatest impact on the maximum pressure of low-concentration methane explosion.The positive feedback effect of the mixed gas between the equivalence ratio concentration and the lower explosion limit on the increase of the initial pressure causes the equivalence ratio concentration and the lower explosion limit. The increase in the maximum explosion pressure of the mixed gas is greater than the increase between the equivalence ratio concentration and the upper explosion limit,that is,the mixture gas between the equivalence ratio concentration and the lower explosion limit is higher than the initial pressure between the equivalence ratio concentration and the upper explosion limit. Analyzing the influence of initial pressure on the propagation of methane explosions has guiding significance for reducing the severity of methane explosion accidents in tank farms.
There are various storage tanks in the industrial production site,especially in the natural gas cylinder tank area. The natural gas explosion shock waves generate projectile debris and form a domino effect. In this paper,using a constant volume incendiary bomb explosion experimental device,by setting different initial pressures and methane concentration conditions,experimental studies were carried out on the different methane explosion characteristics under different initial pressures. The results show that the initial pressure increases and the maximum explosion of methane-air mixture is achieved. Increased pressure increases explosion risk.The initial pressure has the greatest impact on the maximum pressure of low-concentration methane explosion.The positive feedback effect of the mixed gas between the equivalence ratio concentration and the lower explosion limit on the increase of the initial pressure causes the equivalence ratio concentration and the lower explosion limit. The increase in the maximum explosion pressure of the mixed gas is greater than the increase between the equivalence ratio concentration and the upper explosion limit,that is,the mixture gas between the equivalence ratio concentration and the lower explosion limit is higher than the initial pressure between the equivalence ratio concentration and the upper explosion limit. Analyzing the influence of initial pressure on the propagation of methane explosions has guiding significance for reducing the severity of methane explosion accidents in tank farms.
引文
[1]邱龙.受限空间LNG爆炸后果模拟与吸能型防爆墙设计[D].青岛:中国石油大学,2015.
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[8]任瑞娥,吕荣,李媛.不同浓度甲烷爆炸火焰传播过程的实验研究[J].化工中间体,2014(3):45-48.
[2]胡耀元,周邦智,杨元法,等.多元爆炸性混合气体爆炸极限及容器因素[J].中国科学(B辑),2002,32(1):35-39.
[3]傅志远,谭迎新.多元可燃性混合气体临界氧浓度的测定[J].工业安全与环保,2004,(30)12:25-27.
[4]黄超,杨绪杰,陆路德,等.烷烃高温下爆炸极限的测定[J].化工进展,2002,21(7):496-498.
[5]卢捷.多元混合气体爆炸特性与安全控制研究[D].北京:北京理工大学,2003.
[6]李艳红.受限空间内瓦斯爆炸过程的反应动力学特性研究[D].阜新:辽宁工程技术大学,2011.
[7]贾宝山,李艳红,曾文,等.受限空间瓦斯爆炸链式反应机理的敏感性分析[J].环境工程,2011(29):318-323.
[8]任瑞娥,吕荣,李媛.不同浓度甲烷爆炸火焰传播过程的实验研究[J].化工中间体,2014(3):45-48.