混合均匀性对甲烷爆炸特性影响的试验研究
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摘要
为探明甲烷在不同混合均匀性下的爆炸特性,预防甲烷气体爆炸,设计由喷射流混合器和静态混合器组成的2级气体混合器,并利用自行研制的可燃气体爆炸特性测试装置,试验测试不使用和使用2级气体混合器2种情况下甲烷的爆炸极限和爆炸压力。结果表明:在2级气体混合器的作用下,甲烷的爆炸下限从5. 25%降低到5. 15%,爆炸上限从17. 15%升高到17. 55%,甲烷爆炸极限范围拓宽了4. 20%,且甲烷爆炸上限受混合均匀性的影响较大;使用2级气体混合器时,甲烷爆炸压力升高,且随着甲烷体积分数的升高,爆炸压力的增幅先增大后减小,当甲烷体积分数为11%时,爆炸压力的增幅最大,甲烷爆炸压力受混合均匀性的影响也最大。
In order to explore the methane explosion characteristics under different mixing uniformity conditions and prevent the methane explosion,a two-stage gas mixer composed of a jet mixer and a static mixer was designed,made and used to carry out experiments on mixtures of methane and air. Explosion limits and explosion pressure of methane were studied by using the self-developed test device. The experiment results show that under the action of two stage gas mixer,the lower explosive limit of methane decreases from 5.25% to 5.15%,the upper explosive limit increases from 17.15% to 17.55%,the methane explosion range is expanded by 4.20%,and the upper explosive limit is greatly influenced by the mixing uniformity,that as the methane concentration increases,the increase in explosion pressure increases first and then decreases,that when the volume fraction of methane is 11%,the explosion pressure has the largest increase,and the methane explosion pressure is the most affected by the mixing uniformity.
In order to explore the methane explosion characteristics under different mixing uniformity conditions and prevent the methane explosion,a two-stage gas mixer composed of a jet mixer and a static mixer was designed,made and used to carry out experiments on mixtures of methane and air. Explosion limits and explosion pressure of methane were studied by using the self-developed test device. The experiment results show that under the action of two stage gas mixer,the lower explosive limit of methane decreases from 5.25% to 5.15%,the upper explosive limit increases from 17.15% to 17.55%,the methane explosion range is expanded by 4.20%,and the upper explosive limit is greatly influenced by the mixing uniformity,that as the methane concentration increases,the increase in explosion pressure increases first and then decreases,that when the volume fraction of methane is 11%,the explosion pressure has the largest increase,and the methane explosion pressure is the most affected by the mixing uniformity.
引文
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[2]孙彦龙,谭迎新,谢溢月,等.甲醇汽油混合物爆炸下限测试研究[J].中国安全科学学报,2015,25(12):56-61.SUN Yanlong,TAN Yingxin,XIE Yiyue,et al. Study on lower explosive limits of methanol-gasoline blends[J]. China Safety Science Journal,2015,25(12):56-61.
[3]孙彦龙.甲醇汽油爆炸极限及自燃温度测试研究[D].太原:中北大学,2016.SUN Yanlong. Study on explosion limits and autoignition temperatures of methanol-gasoline blends[D]. Taiyuan:North University of China,2016.
[4]谢溢月,谭迎新,孙彦龙.湍流状态下甲烷爆炸极限的测试研究[J].中国安全科学学报,2016,26(11):65-69.XIE Yiyue,TAN Yingxin,SUN Yanlong. Explosive limits of methane in turbulent flow[J].China Safety Science Journal,2016,26(11):65-69.
[5]高娜,胡毅亭,张延松.初始温度对甲烷-空气爆炸压力影响的试验研究[J].爆破器材,2016,45(3):26-30.GAO Na,HU Yiting,ZHANG Yansong. Experimental research on methane-air mixtures explosion pressure under normal and elevated initial temperatures[J]. Explosive Materials,2016,45(3):26-30.
[6]罗振敏,林京京,郭正超,等.煤矿其他可燃气体对空气中甲烷爆炸极限的影响[J].中国安全科学学报,2015,25(1):91-97.LUO Zhenmin,LIN Jingjing,GUO Zhengchao,et al. Influence of various other flammable gases in coal mine on explosion limits of methane[J]. China Safety Science Journal,2015,25(1):91-97.
[7]丁小勇,谭迎新,李媛.水平管道中立体障碍物对瓦斯爆炸特性的影响[J].煤矿安全,2012,43(8):4-7.DING Xiaoyong,TAN Yingxin,LI Yuan. The influences of stereo obstacles on gas explosion characteristics in horizontal pipe[J].Safety in Coal Mines,2012,43(8):4-7.
[8]谭迎新,焦国太,霍雨江,等.一种管道式可燃气体的动态爆炸极限参数测定装置:中国,CN206960395U[P].2018-02-02.
[9]胡双启.燃烧与爆炸[M].北京:北京理工大学出版社,2015:13-15.
[10] GB/T12474—2008,空气中可燃气体爆炸极限测定方法[S].GB/T12474-2008,Test method for combustible gas explosion limit in air[S].
[11] ASTM E659-2005,Standard test method for auto ignition temperature of liquid chemicals[S].
[12]邓军,程方明,罗振敏,等.湍流状态下甲烷爆炸特性的实验研究[J].中国安全科学学报,2008,18(8):85-88.DENG Jun,CHENG Fangming,LUO Zhenmin,et al. Experimental study on methane explosion property in turbulent flow[J]. China Safety Science Journal,2008,18(8):85-88.