基于程序升温的不同粒径煤氧化活化能试验研究
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摘要
为了研究粒径对煤氧化反应活化能的影响,利用煤自燃程序升温试验装置,研究了不同粒径煤样在低温氧化阶段的耗氧速率以及气体产物与温度对应关系,分析了气体产物与耗氧速率随温度的变化规律,得到不同粒径煤样的临界温度点,并使用该温度点将低温氧化阶段划分为2个阶段,并对不同阶段开展了动力学分析。建立了耗氧速率与煤体温度之间的阿伦尼乌斯公式并对其进行对数处理得到活化能方程,分析该方程的线性回归直线斜率并计算出煤样低温氧化表观活化能。研究结果表明:粒径对表观活化能的影响较大,且基本遵循粒径越大,活化能越大的规律。粒径为5～7 mm的煤样在临界温度前的活化能是最大的,证明相较于其他粒径,该粒径的煤样在低温阶段不易自燃。通过混样活化能的对比可以看出,2-2中煤层比3-1煤层自燃倾向性低。
In order to study the coal partical affected to the coal oxidation reaction and activated energy,a programmed temperature rising experiment device of the coal spontaneous combustion was applied to study the oxygen consumption rate of different partical coal samples at the low temperature oxidation stage as well as the corresponding relationship between the gas product and temperature and to analyze the gas product and oxygen consumption rate with the temperature variation law. A critical temperature point of the different partical coal samples were obtained,the temperature point was used to divide the low temperature oxidation stage into two stages,and the kinetic analysis was carried out for different stages.Arrhenius equation between the oxygen consumption rate and coal temperature was established and the activated energy equation was obtained from the logarithmic processing. The linear regressive straight line slope of the equation was analyzed and the low temperature oxidized apparent activation energy of the coal sample was calculated. The study results showed that the partical size would have a high influence to the apparent activation energy. The larger the partical size was,the higher activation energy would be. The coal samples with the partical size of 5 ～ 7 mm would have maximum activation energy before the critical temperature reached.Compared with other particle sizes,the coal samples with the partical size would be not easy to have the spontaneous combustion at the low temperature stage. The comparison between the activation energy of the mixed samples showed that the spontaneous combustion tendency of No. 2-2 seam would be lower than No. 3-1 seam.
In order to study the coal partical affected to the coal oxidation reaction and activated energy,a programmed temperature rising experiment device of the coal spontaneous combustion was applied to study the oxygen consumption rate of different partical coal samples at the low temperature oxidation stage as well as the corresponding relationship between the gas product and temperature and to analyze the gas product and oxygen consumption rate with the temperature variation law. A critical temperature point of the different partical coal samples were obtained,the temperature point was used to divide the low temperature oxidation stage into two stages,and the kinetic analysis was carried out for different stages.Arrhenius equation between the oxygen consumption rate and coal temperature was established and the activated energy equation was obtained from the logarithmic processing. The linear regressive straight line slope of the equation was analyzed and the low temperature oxidized apparent activation energy of the coal sample was calculated. The study results showed that the partical size would have a high influence to the apparent activation energy. The larger the partical size was,the higher activation energy would be. The coal samples with the partical size of 5 ～ 7 mm would have maximum activation energy before the critical temperature reached.Compared with other particle sizes,the coal samples with the partical size would be not easy to have the spontaneous combustion at the low temperature stage. The comparison between the activation energy of the mixed samples showed that the spontaneous combustion tendency of No. 2-2 seam would be lower than No. 3-1 seam.
引文
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[16]李雪明,王继仁,王雪峰,等.碱性水对煤自燃特性影响实验研究[J].中国安全生产科学技术,2018,14(2):106-111.LI Xueming,WANG Jiren,WANG Xuefeng,et al. Experimental study on effect of alkaline water on spontaneous combustion characteristics of coal[J]. Journal of Safety Science and Technology,2018,14(2):106-111.
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[21]徐精彩,张辛亥,文虎,等.煤氧复合过程及放热强度测算方法.[J].中国矿业大学学报,2000,29(3):253-257.XU Jingcai,ZHANG Xinhai,WEN Hu,et al.Procedure of reaction between coal and oxygen at low temperature and calculation of its heat emitting intensity[J]. Journal of China University of Mining&Technology,2000,29(3):253-257.
[22]徐精彩.煤自燃危险区域判定理论[M].北京:煤炭工业出版社,2001:54-76.
[23]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 Xinhai,BAI Yae,LI Qingwei,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.
[24]赵婧昱.淮南煤氧化动力学过程及其微观结构演化特征研究[D].西安:西安科技大学,2017:51-64.
[25]张嬿妮,陈龙,邓军,等.基于程序升温实验的同组煤氧化动力学分析[J].煤矿安全,2018,49(5):31-34,39.ZHANG Yanni,CHEN Long,DENG Jun,et al.Oxidationkinetic analysis of the same group coal based on programmed temperature[J].Safety in Coal Mines,2018,49(5):31-34,39.
[26]张树川.煤样粒径对煤低温氧化影响的实验研究[J].安徽理工大学学报:自然科学版,2013,33(4):62-66.ZHANG Shuchuan.Study on influence of coal particle size on low temperature oxidation of coal[J]. Journal of Anhui University of Science and Technology:Natural Science,2013,33(4):62-66.
[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]王省身,张国枢.矿井火灾防治[M].徐州:中国矿业大学出版社,1990:23-75.
[4] MT/T707—1997,煤自燃倾向性色谱吸氧鉴定[S].
[5]戚颖敏,钱国胤.煤自燃倾向性色谱吸氧鉴定法与应用[J].煤,1996,5(2):5-9.QI Yingmin,QIAN Guoyin. Determination and application of spontaneous combustion tendency chromatographic oxygen uptake[J].Coal,1996,5(2):5-9.
[6]刘剑,王继仁,孙宝铮.煤的活化能理论研究[J].煤炭学报,1999,24(3):316-320.LIU Jian,WANG Jiren,SUN Baozheng.Theoretical study on the activation energy of coal[J].Journal of China Coal Society,1999,24(3):316-320.
[7] Ren T X,Edwards J S,Clarke D.Adiabatic oxidation study on the propensity of pulverised coals to spontaneous combustion[J].Fuel,1999,78(14):1611-1620.
[8]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,2009,36(S1):206-207.LIU Chaowen,LU Wei,XU Jun. Coal spontaneous combustion process control steps analysis[J]. Mining Safety&Environmental Protection,2009,36(S1):206-207.
[9]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 Deming,ZHONG Xiaoxing,et al. Tendency of spontaneous combustion of coal based on activation energy[J].Journal of China University of Mining&Technology,2006,35(2):201-205.
[10]高思源,李增华,杨永良,等.煤低温氧化活化能与温度关系实验[J].煤矿安全,2011,42(7):23-27.GAO Siyuan,LI Zenghua,YANG Yongliang,et al.Test of the relationship between activation energy of low-temperature oxidation of coal and temperature[J].Safety in Coal Mines,2011,42(7):23-27.
[11]仲晓星,王德明,陆伟,等.交叉点温度法对煤氧化动力学参数的研究[J].湖南科技大学学报:自然科学版,2007,22(1):13-16.ZHONG Xiaoxing,WANG Deming,LU Wei,et al.Study on the kinetics of coal oxidation at intersection temperature[J]. Journal of Hunan University of Science&Technology:Natural Science Edition,2007,22(1):13-16.
[12]张磊,秦岭,包军,等.基于温升速率的煤自燃倾向性测定方法[J].科学技术与工程,2017,17(30):186-189.ZHANG Lei, QIN Ling, BAO Jun, et al. Measurement determination method of coal spontaneous combustion tendency based on increasing rate[J]. Science Technology and Engineering,2017,17(30):186-189.
[13]王继仁,邓存宝,单亚飞,等.煤的自燃倾向性新分类方法[J].煤炭学报,2008,33(1):47-50.WANG Jiren,DENG Cunbao,SHAN Yafei,et al. A new classifying method of spontaneous combustion tendency[J].Journal of China Coal Society,2008,33(1):47-50.
[14]王雪峰,孙艳秋,李丽,等.双外推法对煤氧化燃烧的动力学特性研究[J].中国安全生产科学技术,2014,10(9):72-76.WANG Xuefeng,SUN Yanqiu,LI Li,et al.Research on the dynamic characteristics of coal combustionin double extrapolation[J].Journal of Safety Science and Technology,2014,10(9):72-76.
[15]陆卫东,王继仁,邓存宝,等.基于活化能指标的煤自燃阻化剂实验研究[J].矿业快报,2007(10):45-47,89.LU Weidong,WANG Jiren,DENG Cunbao,et al.Research on inhibitors of coal spontaneous ignition based on activation energy index[J].Express Information of Mining Industry,2007(10):45-47,89.
[16]李雪明,王继仁,王雪峰,等.碱性水对煤自燃特性影响实验研究[J].中国安全生产科学技术,2018,14(2):106-111.LI Xueming,WANG Jiren,WANG Xuefeng,et al. Experimental study on effect of alkaline water on spontaneous combustion characteristics of coal[J]. Journal of Safety Science and Technology,2018,14(2):106-111.
[17]夏少武.活化能及其计算[M].北京:高等教育出版社,1989:28-89.
[18]鲁崇贤.有机化学[M].北京:科学出版社,2003:14-41.
[19]虞继舜.煤化学[M].北京:冶金工业出版社,2000:24-56.
[20]张嬿妮.煤氧化自燃微观特征及其宏观表征研究[D].西安:西安科技大学,2012:100-113.
[21]徐精彩,张辛亥,文虎,等.煤氧复合过程及放热强度测算方法.[J].中国矿业大学学报,2000,29(3):253-257.XU Jingcai,ZHANG Xinhai,WEN Hu,et al.Procedure of reaction between coal and oxygen at low temperature and calculation of its heat emitting intensity[J]. Journal of China University of Mining&Technology,2000,29(3):253-257.
[22]徐精彩.煤自燃危险区域判定理论[M].北京:煤炭工业出版社,2001:54-76.
[23]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 Xinhai,BAI Yae,LI Qingwei,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.
[24]赵婧昱.淮南煤氧化动力学过程及其微观结构演化特征研究[D].西安:西安科技大学,2017:51-64.
[25]张嬿妮,陈龙,邓军,等.基于程序升温实验的同组煤氧化动力学分析[J].煤矿安全,2018,49(5):31-34,39.ZHANG Yanni,CHEN Long,DENG Jun,et al.Oxidationkinetic analysis of the same group coal based on programmed temperature[J].Safety in Coal Mines,2018,49(5):31-34,39.
[26]张树川.煤样粒径对煤低温氧化影响的实验研究[J].安徽理工大学学报:自然科学版,2013,33(4):62-66.ZHANG Shuchuan.Study on influence of coal particle size on low temperature oxidation of coal[J]. Journal of Anhui University of Science and Technology:Natural Science,2013,33(4):62-66.