不同氧浓度和温度下侏罗纪煤氧化动力学参数规律
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摘要
为了研究不同氧浓度和温度下侏罗纪煤的氧化动力学参数,在不同供氧条件下的基础上,通过程序升温氧化实验装置,应用化学反应动力学原理,计算出我国典型侏罗纪煤样的耗氧速率及氧化反应动力学参数。结果表明,各煤样的表观活化能随温度及供氧浓度变化而变化。当供氧浓度一定时,各煤样氧化反应的表观活化能在30～60℃和大于70℃2个温度段内各不相同并呈分段性,前者大于后者。若供氧浓度变化时,当供氧浓度大于10%时,各煤样氧化反应的表观活化能都比较小,且随着供氧浓度的改变其变化较小;供氧浓度在5%～10%时,各煤样氧化反应的表观活化能随供氧浓度的降低呈明显增加趋势,说明低氧条件下,煤的氧化过程发生了变化,从而进一步抑制了煤的氧化反应。
According to the temperature-programmed oxidation experiments of typical Jurassic coal samples in China under different oxygen supply conditions and chemical reaction dynamics principle,the oxygen consumption rate and the oxidation reaction kinetic parameters of each coal sample were calculated in order to study oxidation kinetic parameters of Jurassic coal under the conditions of different oxygen concentrations and temperatures.The results show that the apparent activation energy of each coal sample changes as temperature and oxygen supply concentration changes.At constant oxygen concentration,the apparent activation energy of oxidation reaction of each coal sample is different between the temperature ranges of 30 ℃ to 60 ℃ and above 70 ℃ and show piecewise characteristics with the former higher than the latter.When the oxygen supply concentration changes,the apparent activation energy of oxidation reaction of each coal sample is relatively low under the condition of oxygen supply concentration exceeding 10%,and changes in a very small range as oxygen supply concentration changes.The apparent activation energy of each coal sample increases as oxygen supply concentration decreases when the oxygen supply concentration is 5%～10%,indicating that the oxidation process of coal has changed under low-oxygen conditions,thereby further inhibiting the oxidation reaction of coal.
According to the temperature-programmed oxidation experiments of typical Jurassic coal samples in China under different oxygen supply conditions and chemical reaction dynamics principle,the oxygen consumption rate and the oxidation reaction kinetic parameters of each coal sample were calculated in order to study oxidation kinetic parameters of Jurassic coal under the conditions of different oxygen concentrations and temperatures.The results show that the apparent activation energy of each coal sample changes as temperature and oxygen supply concentration changes.At constant oxygen concentration,the apparent activation energy of oxidation reaction of each coal sample is different between the temperature ranges of 30 ℃ to 60 ℃ and above 70 ℃ and show piecewise characteristics with the former higher than the latter.When the oxygen supply concentration changes,the apparent activation energy of oxidation reaction of each coal sample is relatively low under the condition of oxygen supply concentration exceeding 10%,and changes in a very small range as oxygen supply concentration changes.The apparent activation energy of each coal sample increases as oxygen supply concentration decreases when the oxygen supply concentration is 5%～10%,indicating that the oxidation process of coal has changed under low-oxygen conditions,thereby further inhibiting the oxidation reaction of coal.
引文
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[19] 邓军,张嬿妮.煤自然发火微观机理[M].北京:中国矿业大学出版社,2015.DENG Jun,ZHANG Yan-Ni.Microscopic mechanism of spontaneous combustion of coal[M].Beijing:China University of Mining and Technology Press,2015.
[20] 徐精彩.煤自燃危险区域判定理论[M].北京:煤炭工业出版社,2011.XU Jing-cai.Determination theory of coal spontaneous combustion zone[M].Beijing:China Coal Industry Publishing House,2001.
[21] 袁壮.煤自燃阶段特征及活化能变化规律的实验研究[D].重庆:重庆大学,2017.YUAN Zhuang.Experimental study on oxidation characteristics and activation energy of coal during spontaneous combustion[D].Chongqing:Chongqing University,2017.
[22] 马砺,邓军,王伟峰,等.CO2对煤低温氧化反应过程的影响实验研究[J].西安科技大学学报,2014,34(4):379-383.MA Li,DENG Jun,WANG Wei-feng,et al.Experimental study on the effect of CO2 on low temperature oxidation reaction of coal[J].Journal of Xi’an University of Science and Technology,2014,34(4):379-383.
[2] 翟小伟.煤氧化过程CO产生机理及安全指标研究[D].西安:西安科技大学,2012.ZHAI Xiao-wei.Study on CO production mechanism and safety index of coal oxidation process[D].Xi’an:Xi’an University of Science and Technology,2012.
[3] 刘朝文,陆伟,徐俊.煤自燃过程控制步骤的分析[J].矿业安全与环保,2009(S1):206-207.LIU Chao-wen,LU Wei,XU Jun.Analysis of control steps of coal spontaneous combustion process[J].Mining Safety and Environmental Protection,2009(S1):206-207.
[4] 王省身,张国枢.矿井火灾防治[M].徐州:中国矿业大学出版社,1990.WANG Sheng-shen,ZHANG Guo-shu.Mine fire prevention[M].Xuzhou:China University of Mining and Technology Press,1990.
[5] 秦书玉,赵书田,张永吉.煤矿井下内因火灾防治技术[M].沈阳:东北大学出版社,1993.QIN Shu-yu,ZHAO Shu-tian,ZHANG Yong-ji.Coal mine underground fire prevention technology surgery[M].Shenyang:Northeastern University Press,1993.
[6] Qi G,Wang D,Zheng K,et al.Kinetics characteristics of coal low-temperature oxidation in oxygen-depleted air[J].Journal of Loss Prevention in the Process Indus-tries,2015,35:224-231.
[7] Liu B,Zhang Z,Zhang H,et al.An experimental investigation on theeffect of convection on the ignition behaviour of single coal particles under various O2 concentrations[J].Fuel,2014,116(6):77-83.
[8] 王德明,辛海会,戚绪尧,等.煤自燃中的各种基元反应及相互关系:煤氧化动力学理论及应用[J].煤炭学报,2014,39(8):1667-1674.WANG De-Ming,XIN Hai-hui,QI Xu-yao,et al.Mechanism and relationships of elementary reactions in spontaneous combustion of coal:the coal oxidation kinetics theory and application[J].Journal of China Coal Society,2014,39(8):1667-1674.
[9] 马砺,王伟峰,邓军,等.CO2对煤升温氧化燃烧特性的影响[J].煤炭学报,2014,39(S2):397-404.MA Li,WANG Wei-feng,DENG Jun,et al.Effect of CO2 on characteristics of oxidation combustion for coal[J].Journal of China Coal Society,2014,39(S2):397-404.
[10] 邓军,张扬,李成会,等.水浸煤体自燃极限参数和氧化动力学的研究[J].煤炭技术,2016,35(3):152-154.DENG Jun,ZHANG Yang,LI Cheng-Hui,et al.Research of limit parameters and oxidation kinetics of waterlogging coal selfignition[J].Coal Technology,2016,35(3):152-154.
[11] 刘剑,王继仁.煤的活化能的理论与研究[J].煤炭学报,1999,24(3):316-320.LIU Jian,Wang Ji-ren.A study on the theory of activation energy of coal[J].Journal of China Coal Society,1999,24(3):316-320.
[12] 陆伟,王德明,仲晓星,等.基于活化能的煤自燃倾向性研究[J].中国矿业大学学报,2006,35(2):201-205.LU Wei,WANG De-ming,ZHONG Xiao-xing,et al.Tendency of spontaneous combustion of coal based on activation energy[J].Journal of China University of Mining and Technology,2006,35(2):201-205.
[13] 仲晓星,王德明,尹晓丹.基于程序升温的煤自燃临界温度测试方法[J].煤炭学报,2010,35(S):128-131.ZHONG Xiao-Xing,WANG De-ming,YIN Xiao-dan.Test method of critical temperature of coal spontaneous combustion based on the temperature programmed experiment[J].Journal of China Coal Society,2010,35(S):128-131.
[14] 张辛亥,白亚娥,李青蔚,等.基于活化能指标研究不同变质程度烟煤的自燃倾向性[J].矿业安全与环保,2016,43(1):5-7,11.ZHANG Xin-hai,BAI Ya-e,LI Qing-wei,et al.Research on spontaneous combustion tendency of bituminous coals in different metamorphic grades based on activation energy index[J].Mining Safety & Environmental Protection,2016,43(1):5-7,11.
[15] 余明高,袁壮,褚廷湘,等.煤自燃预测气体及活化能变化研究[J].安全与环境学报,2017,17(5):1788-1795.YU Ming-Gao,YUAN Zhuang,CHU Ting-Xiang,et al.Forecast of the coal gas spontaneous combustion and changing regularity of the activation energy[J].Journal of Safety and Environment,2017,17(5):1788-1795.
[16] 邓军,李青蔚,肖旸,等.原煤和氧化煤的低温氧化特性[J].西安科技大学学报,2018,38(1):1-7.DENG Jun,LI Qing-wei,XIAO Yang,et al.Low temperature oxidation characteristics of raw coal and oxidized coal[J].Journal of Xi’an University of Science and Technology,2018,38(1):1-7.
[17] 邓军,徐精彩,李莉,等.不同氧气浓度煤样耗氧特性实验研究[J].湘潭矿业学院学报,2001(2):12-14,18.DENG Jun,XU Jing-Cai,LI Li,et al.Experimental investigation of oxygen consumption rate of coal under different oxygen concentrations[J].Journal of Xiangtan Mining Institute,2001(2):12-14,18.
[18] 黄显华.易自燃煤层残留煤柱开采防灭火技术研究[D].北京:中国矿业大学(北京),2015.HUANG Xian-Hua.Research on fire control technology of residual pillarmining with spontaneous combustion in mine[D].Beijing:China University of Mining and Technology(Beijing),2015.
[19] 邓军,张嬿妮.煤自然发火微观机理[M].北京:中国矿业大学出版社,2015.DENG Jun,ZHANG Yan-Ni.Microscopic mechanism of spontaneous combustion of coal[M].Beijing:China University of Mining and Technology Press,2015.
[20] 徐精彩.煤自燃危险区域判定理论[M].北京:煤炭工业出版社,2011.XU Jing-cai.Determination theory of coal spontaneous combustion zone[M].Beijing:China Coal Industry Publishing House,2001.
[21] 袁壮.煤自燃阶段特征及活化能变化规律的实验研究[D].重庆:重庆大学,2017.YUAN Zhuang.Experimental study on oxidation characteristics and activation energy of coal during spontaneous combustion[D].Chongqing:Chongqing University,2017.
[22] 马砺,邓军,王伟峰,等.CO2对煤低温氧化反应过程的影响实验研究[J].西安科技大学学报,2014,34(4):379-383.MA Li,DENG Jun,WANG Wei-feng,et al.Experimental study on the effect of CO2 on low temperature oxidation reaction of coal[J].Journal of Xi’an University of Science and Technology,2014,34(4):379-383.