高温贫氧下不同温度阶段煤体自燃指标气体测试
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摘要
为了研究高温贫氧条件对煤自燃指标气体释放的影响,利用西安科技大学自主研发的高温氧化燃烧特性测试装置,测试30～500℃过程中煤自燃气体变化规律,通过使用指标气体的增长率分析法,并参考热分析实验温度区间划分准则,得出5个特征温度点,以此作为划分煤样常温至高温不同氧化阶段的依据,分为4个阶段:分别是临界温度阶段,干裂-活性-增速温度阶段,增速-燃点温度阶段和燃烧阶段。分析不同阶段的指标气体的变化规律,实验结果表明,CO气体在第1阶段增长较为缓慢,在第2,第3阶段增长较为迅速,呈现出指数级增长态势,当温度超过燃烧温度后,CO气体浓度开始呈现出下降的态势,后由于稳定官能团的断裂,气体浓度有所回升。C_2H_4气体在干裂-活性-增速温度阶段前增长较为缓慢,而后急剧增长,当温度到达燃烧温度时,C_2H_4气体浓度达到顶峰,随后随着温度的上升,气体浓度急剧下降。
To study the characteristics of high temperature and oxygen-poor conditions on indicator gases of coal spontaneous combustion,the independently designed high-temperature programmed experimental system was used to test the changes of gaseous products during 30 ℃ to 500 ℃. Growth rate analysis method of the indicator gases was adopted to calculate the characteristic temperatures. With reference of thermal gravimetric analysis on temperature division,the five characteristic temperature points are confirmed. Four different oxidation stages were divided by the five temperatures,i. e,as critical temperature stage,crack-active-speedup temperature stage,speedup-ignite temperature stage and combustion stage.Moreover,the variation of indicator gases at different stages were studied. The results showed that the concentration of CO gas increases slowly in the critical temperature stage,and rapidly in the second and third stage with trend of exponential liner. When the temperature exceeded the combustion temperature,the CO gas begins to decrease firstly,and then increase again because of the fracture of the stable functional groups. The C_2H_4 gas released slowly before crack-active-speedup temperature,then increased sharply,and when the temperature reached the combustion temperature,the C_2H_4 gas concentration reached the peak value.
To study the characteristics of high temperature and oxygen-poor conditions on indicator gases of coal spontaneous combustion,the independently designed high-temperature programmed experimental system was used to test the changes of gaseous products during 30 ℃ to 500 ℃. Growth rate analysis method of the indicator gases was adopted to calculate the characteristic temperatures. With reference of thermal gravimetric analysis on temperature division,the five characteristic temperature points are confirmed. Four different oxidation stages were divided by the five temperatures,i. e,as critical temperature stage,crack-active-speedup temperature stage,speedup-ignite temperature stage and combustion stage.Moreover,the variation of indicator gases at different stages were studied. The results showed that the concentration of CO gas increases slowly in the critical temperature stage,and rapidly in the second and third stage with trend of exponential liner. When the temperature exceeded the combustion temperature,the CO gas begins to decrease firstly,and then increase again because of the fracture of the stable functional groups. The C_2H_4 gas released slowly before crack-active-speedup temperature,then increased sharply,and when the temperature reached the combustion temperature,the C_2H_4 gas concentration reached the peak value.
引文
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[15]许延辉,许满贵,徐精彩.煤自燃火灾指标气体预测预报的几个关键问题探讨[J].矿业安全与环保,2005,32(1):16-24.XU Yan-hui,XU Man-gui,XU Jing-cai. Discussion on several key problems of gas prediction and prediction of coal spontaneous combustion fire mining[J]. Safety&Environmental Protection,2005,32(1):16-24.
[16]刘爱华,蔡康旭.青山矿煤自燃预报标志气体研究.[J].煤炭科学技术,2007,35(7):11-14.LIU Ai-hua,CAI Kang-xu. Research on identification gas for coal spontaneous combustion in Qinshan mine[J]. Coal Science and Technology,2007,35(7):11-14.
[17]邓军,李贝,李珍宝,等.预报煤自燃的气体指标优选试验研究[J].煤炭科学技术,2014,42(1):55-59.DENG Jun,LI Bei,LI Zen-bao,et al. Experiment study on gas indexes optimization for coal spontaneous combustion prediction[J]. Coal Science and Technology,2014,42(1):55-59.
[18]彭伟,何启林,葛新玉.煤炭自燃指标性气体确定的实验研究[J].中国安全生产科学技术,2010,6(6):140-144.PENG Wei,HE Qi-lin,GE Xin-yu. Experimental studies on the index gases of spontaneous of coal[J]. Journal of Safety Science and Technology,2010,6(6):140-144.
[2]袁亮.我国深部煤与瓦斯共采战略思考[J].煤炭学报,2016,41(1):1-6.YUAN Liang. Strategic thinking on CO mining of coal and gas in China[J]. Journal of China Coal Society,2016,41(1):1-6.
[3]曹代勇,樊新杰,吴查查,等.内蒙古乌达煤田火区相关裂隙研究[J].煤炭学报,2009,34(8):1009-1014.CAO Dai-yong,FAN Xin-jie,WU Cha-cha,et al. Study on the fractures related with coalfield fire area in Wuda coalfield,Inner Mongolia[J]. Journal of China Coal Society,2009,34(8):1009-1014.
[4] Lu P,Liao G X,Sun J H,et al. Experimental research on indexgas of the coal spontaneous at low-temperature stage[J]. Journal of Loss Prevention in the Process Industries,2004,17(3):243-247.
[5]马汉鹏,陆伟,王宝德.煤自燃过程指标气体产生规律的系统研究[J].矿业安全与环保,2007,12(34):9-14.MA Han-peng,LU Wei,WANG Bao-de. Systematic study on generation law of index gases in process of coal spontaneous combustion[J]. Mining Safety&Environmental Protection,2007,12(34):9-14.
[6]王来贵,白羽,牛爽.残煤自燃过程中温度场与应力场耦合作用[J].辽宁工程技术大学学报(自然科学版),2009,28(6):865-868.WANG Lai-gui,BAI Yu,NIU Shuang. Coupling effect of temperature field and stress field in the residual coal spontaneous combustion[J]. Journal of Liaoning Technical University(Natural Science Edition),2009,28(6):865-868.
[7]陆伟,王德明,周福宝,等.绝热氧化法研究煤的自燃特性[J].中国矿业大学学报,2005,34(2):213-217.LU Wei,WANG De-ming,ZHOU Fu-bao,et al. Study on spontaneous combustion of coal by adiabatic oxidation[J]. Journal of China University of Mining&Technology,2005,34(2):213-217.
[8] Cygankiewicz J. Forecasting of self heating of coal in underground workings[C]//30thInternational Conference of Safety in Mines Research Institutes. 2003:493-502.
[9]徐精彩.煤自燃危险区域判定理论[M].北京:煤炭工业出版社,2001.XU Jing-cai. Determination theory of coal spontaneous combustion zone[M]. Beijing:China Coal Industy Publishing House,2001.
[10]邓军,杨戍.双鸭山集贤煤矿煤样自燃性程序升温实验研究[J].西安科技大学学报,2005,25(4):411-414.DENG Jun,YANG Shu. Determination of coal sample spontaneous combustion tendency for Shuangyashan Jixian Mine[J]. Journal of Xi’an University of Science and Technology,2005,25(4):411-414.
[11] Sahay N Varma N K,Ahmad I,Sinha V K. Critical temperature an approach to define proneness of coal towards spontaneous heating[J]. Journal of Mines,Metals and Fuels,2007,55(10):510-516.
[12]赵婧昱,张嬿妮,宋佳佳,等.促进1/3焦煤氧化的临界参数分析[J].西安科技大学学报,2018,38(4):592-597.ZHAO Jing-yu,ZHANG Yan-ni,SONG Jia-jia,et al. Analysis of critical parameters of 1/3 coking coal during oxidized promotion period[J]. Journal of Xi’an University of Science and Technology,2018,38(4):592-597.
[13]邓军,徐精彩,徐通模,等.煤自燃性参数的测试与应用[J].燃料化学学报,2001,29(6):553-556.DENG Jun,XU Jing-cai,XU Tong-mo,et al. Test and application of the spontaneous combustibility parameters of coal[J]. Journal of Fuel Chemistry and Technology,2001,29(6):553-556.
[14]邓军,徐精彩,阮国强,等.国内外煤炭自然发火预测预报技术综述[J].西安矿业学院学报,1999,19(4):293-297,337.DENG Jun,XU Jing-cai,RUAN Guo-qiang,et al. Review of the prediction and forecasting techniques of coal self-heating both at home and abroad[J]. Journal of Xi’an Mining Institute,1999,19(4):293-297,337.
[15]许延辉,许满贵,徐精彩.煤自燃火灾指标气体预测预报的几个关键问题探讨[J].矿业安全与环保,2005,32(1):16-24.XU Yan-hui,XU Man-gui,XU Jing-cai. Discussion on several key problems of gas prediction and prediction of coal spontaneous combustion fire mining[J]. Safety&Environmental Protection,2005,32(1):16-24.
[16]刘爱华,蔡康旭.青山矿煤自燃预报标志气体研究.[J].煤炭科学技术,2007,35(7):11-14.LIU Ai-hua,CAI Kang-xu. Research on identification gas for coal spontaneous combustion in Qinshan mine[J]. Coal Science and Technology,2007,35(7):11-14.
[17]邓军,李贝,李珍宝,等.预报煤自燃的气体指标优选试验研究[J].煤炭科学技术,2014,42(1):55-59.DENG Jun,LI Bei,LI Zen-bao,et al. Experiment study on gas indexes optimization for coal spontaneous combustion prediction[J]. Coal Science and Technology,2014,42(1):55-59.
[18]彭伟,何启林,葛新玉.煤炭自燃指标性气体确定的实验研究[J].中国安全生产科学技术,2010,6(6):140-144.PENG Wei,HE Qi-lin,GE Xin-yu. Experimental studies on the index gases of spontaneous of coal[J]. Journal of Safety Science and Technology,2010,6(6):140-144.
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