N_2和CO_2对煤燃烧全过程灭火效能的对比研究
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摘要
为掌握N_2和CO_2防治煤燃烧全过程的不同效果,采用自主研制的煤自燃氧化程序升温和煤明火燃烧实验装置,分别对平煤八矿煤样进行了通入相同流量N_2和CO_2抑制煤低温氧化过程和熄灭煤明火燃烧过程实验,测定了煤低温氧化阶段的耗氧速率、CO和CH_4产生率、煤有焰燃烧阶段的温度场温度、标志性气体(O2,CO和CH_4)组分和热释放速率的变化规律.结果表明:相比于煤在纯空气条件下的燃烧,在煤低温氧化阶段,通入CO_2时煤的耗氧速率、CO和CH_4产生率比通入N_2时更低;在煤有焰燃烧阶段,通入CO_2时煤温上升速度、耗氧量、热释放速率以及CO和CH_4产生量的下降速度比通入N_2时更低;在煤阴燃熄灭阶段,通入CO_2时煤温、CO和CH_4产生量下降速度比通入N_2时的更高,而通入CO_2时的耗氧量和热释放速率比通入N_2时的更低,说明CO_2比N_2具有更好的防治煤燃烧全过程的能力.
In order to master the different effects of N_2 and CO_2 inhibiting the whole process of coal combustion,the self-developed experiment devices were used to conduct respectively the experiments on the processes of coal low temperature oxidation and coal flame combustion under the condition of importing same flux N_2 and CO_2,and the change laws of the rate of oxygen consumption;CO and CH_4 production in low temperature oxidation stage and temperature,index gas formation(O_2,CO and CH_4),heat release rate obtained from flame combustion stage were measured.The results show that compared to coal free combustion,in low temperature oxidation stage,the rate of oxygen consumption;CO and CH_4 production during injecting CO_2 are more higher than that of injecting N_2;In flame combustion stage,coal temperature rise rate,oxygen consumption,heat release rate,the speed of CO and CH_4 production decline during injecting CO_2 are more lower;In smoldering extinguishes stage,the coal temperature,the speed of CO and CH_4 production decline during injecting CO_2 are more higher,but oxygen consumption and heat release rate are more lower.It follows that CO_2 has more capacity of inhibiting the whole process of coal combustion compared to N_2.
In order to master the different effects of N_2 and CO_2 inhibiting the whole process of coal combustion,the self-developed experiment devices were used to conduct respectively the experiments on the processes of coal low temperature oxidation and coal flame combustion under the condition of importing same flux N_2 and CO_2,and the change laws of the rate of oxygen consumption;CO and CH_4 production in low temperature oxidation stage and temperature,index gas formation(O_2,CO and CH_4),heat release rate obtained from flame combustion stage were measured.The results show that compared to coal free combustion,in low temperature oxidation stage,the rate of oxygen consumption;CO and CH_4 production during injecting CO_2 are more higher than that of injecting N_2;In flame combustion stage,coal temperature rise rate,oxygen consumption,heat release rate,the speed of CO and CH_4 production decline during injecting CO_2 are more lower;In smoldering extinguishes stage,the coal temperature,the speed of CO and CH_4 production decline during injecting CO_2 are more higher,but oxygen consumption and heat release rate are more lower.It follows that CO_2 has more capacity of inhibiting the whole process of coal combustion compared to N_2.
引文
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[2]仲晓星,杨正杰,窦国兰,等.地下煤火热交换系统相似准则研究[J].中国矿业大学学报,2015,44(6):965-970.ZHONG Xiaoxing,YANG Zhengjie,DOU Guolan,et al.Study on similarity criteria for heat exchange system of underground coal fires[J].Journal of China University of Mining&Technology,2015,44(6):965-970.
[3]王德明.煤氧化动力学理论及应用[M].北京:科学出版社,2012:1-6.WANG Deming.Theory and application of coal oxidation dynamics[M].Beijing:Science Press,2012:1-6.
[4]HU Xincheng,YANG Shengqiang,ZHOU Xiuhong,et al.Coal spontaneous combustion prediction in gob using chaos analysis on gas indicators from upper tunnel[J].Journal of Natural Gas Science and Engineering,2015,26(2):461-469.
[5]王德明.矿井火灾学[M].徐州:中国矿业大学出版社,2008:15-19.WANG Deming.Mine fires[M].Xuzhou:China University of Mining and Technology Press,2008:15-19.
[6]WANG Deming,DOU Guolan,ZHONG Xiaoxing.An experimental approach to selecting chemical inhibitors to retard the spontaneous combustion of coal[J].Fuel,2014,117(1):218-223.
[7]张进军,昝军才.惰性液态CO2防灭火工艺及实践[J].煤矿安全,2011,42(3):88-90.ZHANG Jinjun,ZAN Juncai.Technology and practice of fire prevention and control of inert liquid CO2[J].Coal Mine Safety,2011,42(3):88-90.
[8]鲍庆国.煤自燃理论及防治技术[M].北京:煤炭工业出版社,2002:154-161.BAO Qingguo.Theory and control technology of coal spontaneous combustion[M].Beijing:China Coal Industry Press,2002:154-161.
[9]宋录生.矿井惰性气体防灭火技术[M].北京:化学工业出版社,2008:1-4.SONG Lusheng.Fire prevention and extinguishing technology of inert gas in mine[M].Beijing:Chemical Industry Press,2008:1-4.
[10]王振平,马砺,文虎,等.CO2与N2抑制煤炭氧化自燃对比实验研究[J].煤矿安全,2010,40(2):10-13.WANG Zhenping,MA Li,WEN Hu,et al.A experiment contrast study of CO2and N2inhibited oxidation of spontaneous combustion of coal[J].Safety in Coal Mines,2010,40(2):10-13.
[11]邵昊,蒋曙光,吴征艳,等.二氧化碳和氮气对煤自燃性能影响的对比实验研究[J].煤炭学报,2014,39(11):2244-2249.SHAO Hao,JIANG Shuguang,WU Zhengyan,et al.Comparative research on the influence of dioxide carbon and nitrogen on performance of coal spontaneous combustion[J].Journal of China Coal Society,2014,39(11):2244-2249.
[12]张辛亥,李青蔚.预氧化煤自燃特性试验研究[J].煤炭科学技术,2014,42(11):37-40.ZHANG Xinhai,LI Qingwei.Experiment study on spontaneous combustion characteristics of pre-oxidized coal[J].Coal Science and Technology,2014,42(11):37-40.
[13]JANSSENS M.Measuring rate of heat release by oxygen consumption[J].Fire Technology,1991,27(3):234-249.
[14]李士戎.二氧化碳抑制煤炭氧化自燃性能的实验研究[D].西安:西安科技大学,2008:20-22.LI Shirong.Experimental study on performance that carbon dioxide Inhibits coal oxidation and spontaneous combustion[D].Xi’an:School of Energy Resources,Xi’an University of Science and Technology,2008:20-22.
[15]BATTISTUTTA E,HEMERT P V,MARCIN L,et al.Swelling and sorption experiments on methane,nitrogen and carbon dioxide on dry Selar Cornish coal[J].International Journal of Coal Geology,2010,84(1):39-48.
[16]孙金华,王青松,纪杰,等.火焰精细结构及其传播动力学[M].北京:科学出版社,2011:64-73.SUN Jinhua,WANG Qingsong,JI Jie,et al.Flame fine structure and its propagation dynamic[M].Beijing:Science Press,2011:64-73.
[17]吴仕生,曾玺,任明威,等.含氧/蒸汽气氛中煤高温分解产物分布及反应性[J].燃料化学学报,2012,40(6):660-665.WU Shisheng,ZENG Xi,REN Mingwei,et al.Product distribution andreactivity of coal pyrolysis at high temperature and in atmospheres containing O2/steam[J].Journal of Fuel Chemistry and Technology,2012,40(6):660-665.
[18]朱苏阳,李传亮,杜志敏,等.煤层气的复合解吸模式研究[J].中国矿业大学学报,2016,45(2):319-327.ZHU Suyang,LI Chuanliang,DU Zhimin,et al.Compound desorption model of coalbed methane[J].Journal of China University of Mining&Technology,2016,45(2):319-327.