不同风量下褐煤燃烧碳氧化物生成规律
|
摘要
为研究火区封闭过程中气体组分变化,通过分析火区内气体成分判定火区燃烧状态,以安全封闭火区防止因火灾引发瓦斯爆炸事故.利用程序升温实验研究了风量分别为40 m L/min、80 m L/min、120 m L/min、160 m L/min和200 m L/min时褐煤燃烧产生的碳氧化物体积分数及O_2体积分数变化规律.研究结果表明:风量越大,O_2体积分数变化趋势越小,消耗氧气量越小;相同温度条件下,O_2体积分数有随着风量增加呈现增加的规律性;随着风量增加,CO、CO_2生成量均减少,且CO、CO_2生成量与温度之间呈指数关系变化;相同温度下,随着风量增加,CO、CO_2生成量减少,且燃烧阶段CO生成量与风量呈指数关系变化,CO_2生成量与风量呈线性关系变化.随着风量增加,CO生成初始温度滞后,相同温度时CO生成量减少.
In order to study gas composition changes in the process of fire zone close down, gas composition in the fire zone was analyzed to judge combustion state of fire zone, and fire zone was sealed safely to prevent gas explosion initiated by fire. This paper used programmed heating experiment to study change law of volume fraction of carbon oxides and oxygen emitted from lignite combustion when air volume are 40 m L/min, 80 m L/min, 120 m L/min, 160 m L/min and 200 m L/min respectively. The results shows that the greater the air volume, the smaller the change trend of oxygen volume fraction, and the smaller the amount of oxygen consumption. At a certain temperature, oxygen consumption is increasing with the air volume increase.With the increase of air volume, formation amount of CO and CO_2 are reduced, and the change between formation amount of CO and CO_2 and temperature shows exponential relationship. At the same temperature, CO, CO_2 generation decreases with the increase of air volume. At combustion stage, CO gas production show exponential relationships with air volume, and CO_2 gas production show linear relationships with air volume. With the increase of air volume, the initial temperature of CO generation is hysteretic,and CO formation amount is less at the same temperature.
In order to study gas composition changes in the process of fire zone close down, gas composition in the fire zone was analyzed to judge combustion state of fire zone, and fire zone was sealed safely to prevent gas explosion initiated by fire. This paper used programmed heating experiment to study change law of volume fraction of carbon oxides and oxygen emitted from lignite combustion when air volume are 40 m L/min, 80 m L/min, 120 m L/min, 160 m L/min and 200 m L/min respectively. The results shows that the greater the air volume, the smaller the change trend of oxygen volume fraction, and the smaller the amount of oxygen consumption. At a certain temperature, oxygen consumption is increasing with the air volume increase.With the increase of air volume, formation amount of CO and CO_2 are reduced, and the change between formation amount of CO and CO_2 and temperature shows exponential relationship. At the same temperature, CO, CO_2 generation decreases with the increase of air volume. At combustion stage, CO gas production show exponential relationships with air volume, and CO_2 gas production show linear relationships with air volume. With the increase of air volume, the initial temperature of CO generation is hysteretic,and CO formation amount is less at the same temperature.
引文
[1]肖旸,李青蔚,鲁军辉.空气相对湿度对煤自燃特性的影响研究[J].中国安全科学学报,2015,25(3):34-40.XIAO Yang,LI Qingwei,LU Junhui.Effects of air relative humidity on coal spontaneous combustion properties[J].China Safety Science Journal,2015,25(3):34-40.
[2]赵虹,郭飞,杨建国.印尼褐煤的吸附特性和脱水研究[J].煤炭学报,2008,33(7):799-802.ZHAO Hong,GUO Fei,YANG Jianguo.Adsorption characteristic of Indonesia lignite and dewatering experiment[J].Journal of China Coal Society,2008,33(7):799-802.
[3]YU Jianglong,TAHMASEBI Arash,HAN Yanna,et al.A review on water in low rank coals:The existence,interaction with coal structure and effects on coal utilization[J].Fuel Processing Technology,2013(106):9-20.
[4]YANG Yunlong,JING Xiaoxia,LI Zhiqiang,et al.Effect of drying conditions on moisture re-adsorption performance of dewatered lignite[J].Drying Technology,2013(31):1 430-1 437.
[5]金永飞,李海涛,岳宁芳,等.变氧浓度环境下煤自然发火气体预报指标优选[J].煤矿安全,2014,45(11):27-30.JIN Yongfei,LI Haitao,YUE Ningfang,et al.Optimal selection for gas prediction index of coal spontaneous combustion under different conditions of oxygen concentration[J].Safety in Coal Mines,2014,45(11):27-30.
[6]宋万新,杨胜强,蒋春林,等.含瓦斯风流条件下煤自燃产物CO生成规律的实验研究[J].煤炭学报,2012,37(8):1 320-1 325.SONG Wanxin,YANG Shengqiang,JIANG Chunlin,et al.Experimental research on the formation of CO during coal spontaneous combustion under the condition of methane-contained airflow[J].Journal of China Coal Society,2012,37(8):1 320-1 325.
[7]李伟.煤氧化自燃特性参数变化规律的实验研究[D].西安:西安科技大学,2008.
[8]秦跃平,许士民,乔珽,等.空气流量对遗煤自燃特性影响研究[J].煤矿安全,2014,45(11):34-37.QIN Yueping,XU Shimin,QIAO Ting,et al.Influence of air flow on spontaneous combustion characteristics of residual Coal[J].Safety in Coal Mines,2014,45(11):34-37.
[9]秦跃平,宋宜猛,杨小彬,等.粒度对采空区遗煤氧化速度影响的实验研究[J].煤炭学报,2010,35(S1):132-135.QIN Yueping,SONG Yimeng,YANG Xiaobin,et al.Experimental study on coal granularity influencing oxidation rate in goaf[J].Journal of China Coal Society,2010,35(S1):132-135.
[10]徐精彩,王军.采面供风量与采空区遗煤自燃危险性关系分析[J].西安矿业学院学报,1994(3):195-199.XU Jingcai,WANG Jun.Analysis of the relationship between the air quantity in coal wall and the ignition danger degree of losing coal[J].Journal of Xi’an Mining Institute,1994(3):195-199.
[11]焦新明,王德明,仲晓星,等.基于CO浓度求解煤自燃临界温度的影响因素分析[J].煤矿安全,2012,43(3):11-15.JIAO Xinming,WANG Deming,ZHONG Xiaoxing,et al.The analysis of influencing factors on coal spontaneous combustion calculate critical temperature based on CO concentration[J].Safety in Coal Mines,2012,43(3):11-15.
[12]煤炭科学研究总院煤炭分析实验室,鸡西矿业(集团)公司,鹤壁煤业(集团)公司,淮北矿业(集团)公司.GB/T 482-2008.煤层煤样采取方法[S].北京:中国标准出版社,2008.
[13]煤炭科学研究总院煤炭分析实验室(国家煤炭质量监督中心).GB474-2008.煤样的制备方法[S].北京:中国标准出版社,2008.
[14]周西华,白刚,聂荣山,等.褐煤燃烧阶段烃生成规律研究[J].中国安全科学学报,2016,26(1):58-63.
[2]赵虹,郭飞,杨建国.印尼褐煤的吸附特性和脱水研究[J].煤炭学报,2008,33(7):799-802.ZHAO Hong,GUO Fei,YANG Jianguo.Adsorption characteristic of Indonesia lignite and dewatering experiment[J].Journal of China Coal Society,2008,33(7):799-802.
[3]YU Jianglong,TAHMASEBI Arash,HAN Yanna,et al.A review on water in low rank coals:The existence,interaction with coal structure and effects on coal utilization[J].Fuel Processing Technology,2013(106):9-20.
[4]YANG Yunlong,JING Xiaoxia,LI Zhiqiang,et al.Effect of drying conditions on moisture re-adsorption performance of dewatered lignite[J].Drying Technology,2013(31):1 430-1 437.
[5]金永飞,李海涛,岳宁芳,等.变氧浓度环境下煤自然发火气体预报指标优选[J].煤矿安全,2014,45(11):27-30.JIN Yongfei,LI Haitao,YUE Ningfang,et al.Optimal selection for gas prediction index of coal spontaneous combustion under different conditions of oxygen concentration[J].Safety in Coal Mines,2014,45(11):27-30.
[6]宋万新,杨胜强,蒋春林,等.含瓦斯风流条件下煤自燃产物CO生成规律的实验研究[J].煤炭学报,2012,37(8):1 320-1 325.SONG Wanxin,YANG Shengqiang,JIANG Chunlin,et al.Experimental research on the formation of CO during coal spontaneous combustion under the condition of methane-contained airflow[J].Journal of China Coal Society,2012,37(8):1 320-1 325.
[7]李伟.煤氧化自燃特性参数变化规律的实验研究[D].西安:西安科技大学,2008.
[8]秦跃平,许士民,乔珽,等.空气流量对遗煤自燃特性影响研究[J].煤矿安全,2014,45(11):34-37.QIN Yueping,XU Shimin,QIAO Ting,et al.Influence of air flow on spontaneous combustion characteristics of residual Coal[J].Safety in Coal Mines,2014,45(11):34-37.
[9]秦跃平,宋宜猛,杨小彬,等.粒度对采空区遗煤氧化速度影响的实验研究[J].煤炭学报,2010,35(S1):132-135.QIN Yueping,SONG Yimeng,YANG Xiaobin,et al.Experimental study on coal granularity influencing oxidation rate in goaf[J].Journal of China Coal Society,2010,35(S1):132-135.
[10]徐精彩,王军.采面供风量与采空区遗煤自燃危险性关系分析[J].西安矿业学院学报,1994(3):195-199.XU Jingcai,WANG Jun.Analysis of the relationship between the air quantity in coal wall and the ignition danger degree of losing coal[J].Journal of Xi’an Mining Institute,1994(3):195-199.
[11]焦新明,王德明,仲晓星,等.基于CO浓度求解煤自燃临界温度的影响因素分析[J].煤矿安全,2012,43(3):11-15.JIAO Xinming,WANG Deming,ZHONG Xiaoxing,et al.The analysis of influencing factors on coal spontaneous combustion calculate critical temperature based on CO concentration[J].Safety in Coal Mines,2012,43(3):11-15.
[12]煤炭科学研究总院煤炭分析实验室,鸡西矿业(集团)公司,鹤壁煤业(集团)公司,淮北矿业(集团)公司.GB/T 482-2008.煤层煤样采取方法[S].北京:中国标准出版社,2008.
[13]煤炭科学研究总院煤炭分析实验室(国家煤炭质量监督中心).GB474-2008.煤样的制备方法[S].北京:中国标准出版社,2008.
[14]周西华,白刚,聂荣山,等.褐煤燃烧阶段烃生成规律研究[J].中国安全科学学报,2016,26(1):58-63.