松散煤体自然发火过程氡析出及运移规律
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摘要
火源精准探测一直是煤火灾害防治方向的世界性难题,而同位素测氡是火源精准探测的主要研究方法。为了解采空区火源位置分布及发火情况,基于煤自然发火实验台研究松散煤体发火过程中氡析出及运移规律。为减小测氡过程对自然发火实验影响,设计局部气体循环系统,控制实验取气量,获得松散煤体自然发火过程中氡活度浓度沿轴线分布规律;通过数据筛选及统计分析,获得同一温度条件下氡活度浓度沿轴线分布规律;根据氡活度浓度分布理论,推导实验台轴线方向氡分布方程;基于同一温度条件下氡活度浓度沿轴线分布规律及氡分布方程,获得松散煤体自然发火过程中氡的运移规律,确定真实反映氡析出与煤温关系的节点位置;通过松散煤体单元划分及氡析出理论分析,推导松散煤体氡析出随发火时间的对应关系;基于实验分析和理论推导,获得氡析出与发火时间的变化规律。结果表明:松散煤堆自然发火过程中,沿轴线方向松散煤体内氡运移主要以渗流为主,当T_(max)<50℃时,渗流影响范围为0温度范围内,氡析出随煤温升高呈指数增长,且存在临界温度值,可为松散煤体发火程度判断提供依据。
The accurate detection of fire source has always been a worldwide problem in coal fire disaster prevention,and the isotope measurement is the main research method for the accurate detection of fire source.In order to understand the location distribution of the fire source and the degree of ignition in the goaf,this paper studied the radon precipitation and migration laws in the ignition process of loose coal based on the coal spontaneous combustion laboratory.To reduce the influence of radon measurement process on spontaneous combustion experiment,a local gas circulation system was designed to control the amount of gas taken in the experiment and obtain the distribution law of radon activity concentration along the axis in the spontaneous combustion process of loose coal.Through data screening and statistical analysis,the distribution law of radon activity concentration along the axis was obtained under the same temperature condition.According to the distribution theory of radon activity concentration,the distribution equation of radon in the direction of the axis of the experimental platform was deduced.Based on the distribution law of radon activity concentration along the axis and the distribution equation of radon under the same temperature condition,the migration law of radon in the process of spontaneous combustion of loose coal was obtained,and the node position that truly reflects the relationship between radon precipitation and coal temperature was determined.Corresponding relationship between the precipitation of radon from loose coal and the ignition time was established by loose coal element division and radon exhalation theoretical analysis.Based on experimental analysis and theoretical derivation,the variation law of radon precipitation and ignition time was obtained.The results show that during the spontaneous combustion of loose coal piles,the migration of radon in the direction of the axis is mainly dominated by seepage.When T_(max)<50 ℃,the influence range of seepage is 0
The accurate detection of fire source has always been a worldwide problem in coal fire disaster prevention,and the isotope measurement is the main research method for the accurate detection of fire source.In order to understand the location distribution of the fire source and the degree of ignition in the goaf,this paper studied the radon precipitation and migration laws in the ignition process of loose coal based on the coal spontaneous combustion laboratory.To reduce the influence of radon measurement process on spontaneous combustion experiment,a local gas circulation system was designed to control the amount of gas taken in the experiment and obtain the distribution law of radon activity concentration along the axis in the spontaneous combustion process of loose coal.Through data screening and statistical analysis,the distribution law of radon activity concentration along the axis was obtained under the same temperature condition.According to the distribution theory of radon activity concentration,the distribution equation of radon in the direction of the axis of the experimental platform was deduced.Based on the distribution law of radon activity concentration along the axis and the distribution equation of radon under the same temperature condition,the migration law of radon in the process of spontaneous combustion of loose coal was obtained,and the node position that truly reflects the relationship between radon precipitation and coal temperature was determined.Corresponding relationship between the precipitation of radon from loose coal and the ignition time was established by loose coal element division and radon exhalation theoretical analysis.Based on experimental analysis and theoretical derivation,the variation law of radon precipitation and ignition time was obtained.The results show that during the spontaneous combustion of loose coal piles,the migration of radon in the direction of the axis is mainly dominated by seepage.When T_(max)<50 ℃,the influence range of seepage is 0
引文
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[20] 谢和平,周宏伟,薛东杰,等.煤炭深部开采与极限开采深度的研究与思考[J].煤炭学报,2012,37(4):535-542.XIE Heping,ZHOU Hongwei,XUE Dongjie,et al.Research and consideration on deep coal mining and critical mining depth[J].Journal of China Coal Society,2012,37(4):535-542.
[21] SAFFARI Amir,SERESHKI Farhang,ATAEI Mohammad,et al.Presenting an engineering classification system for coal spontaneous combustion potential[J].International Journal of Coal Science & Technology,2017,4(2):110-128.
[22] ONIFADE M,GENC B.Modelling spontaneous combustion liability of carbonaceous materials[J].International Journal of Coal Science & Technology 2018,5(2):191-212.
[23] DENG J,XIAO Y,LI Q,et al.Experimental studies of spontaneous combustion and anaerobic cooling of coal[J].Fuel,2015,157:261-269.
[24] WEN H,YU Z,DENG J,et al.Spontaneous ignition characteristics of coal in a large-scale furnace:An experimental and numerical investigation[J].Applied Thermal Engineering,2017,114:583-592.
[25] LU W,CAO Y J,CTIEN J.Method for prevention and control of spontaneous combustion of coal seam and its application in mining field[J].International Journal of Mining Science and Technology,2017,27(5):839-846.
[26] 赵耀江,邬剑明.测氡探火机理的研究[J].煤炭学报,2003,28(3):260-263.ZHAO Yaojiang,WU Jianming.Study on mechanism of detecting underground fire by radon measurement technique[J].Journal of China Coal Society,2003,28(3):260-263.
[2] KUENZER C,STRACHER G B.Geomorphology of coal seam fires[J].Geomorphology,2012,138(1):209-222.
[3] DIJK P V,ZHANG J,WANG J,et al.Assessment of the contribution of in-situ combustion of coal to greenhouse gas emission;based on a comparison of Chinese mining information to previous remote sensing estimates[J].International Journal of Coal Geology,2011,86(1):108-119.
[4] WU J J,LI X C.Risk assessment of underground coal fire development at regional scale[J].International Journal of Coal Geology,2011,86(1):87-94.
[5] ZHAO Y,ZHANG J,CHOU C L,et al.Trace element emissions from spontaneous combustion of gob piles in coal mines,Shanxi,China[J].International Journal of Coal Geology,2008,73(1):52-62.
[6] ZHANG J Z,KUENZER C.Thermal surface characteristics of coal fires 1:Results of in-situ measurements[J].Journal of Applied Geophysics,2007,63(3):117-134.
[7] SHAO Z,WANG D,WANG Y,et al.Theory and application of magnetic and self-potential methods in the detection of the Heshituoluogai coal fire,China[J].Journal of Applied Geophysics,2014,104(1):64-74.
[8] LU P,LIAO G X,SUN J H,et al.Experimental research on index gas of the coal spontaneous at low-temperature stage[J].Journal of Loss Prevention in the Process Industries,2004,17(3):243-247.
[9] XUE S,DICKSON B,WU J.Application of222Rn technique to locate subsurface coal heatings in Australian coal mines[J].International Journal of Coal Geology,2008,74(2):139-144.
[10] FENG Y,PENG S P,MA J W,et al.Spectral analysis for ground penetrating radar surveys of the underground coal fire in Wuda Coal Mine[J].Journal of China Coal Society,2010,35(5):770-775.
[11] CHEN Y,JING,L,BO Y,et al.Detection of coal fire location and change based on multi-temporal thermal remotely sensed data and field measurements[J].International Journal of Remote Sensing,2007,28,3173-3179.
[12] QIN B,WANG H,YANG J,et al.Large-area goaf fires:A numerical method for locating high-temperature zones and assessing the effect of liquid nitrogen fire control[J].Environmental Earth Sciences,2016,75(21):1396.
[13] 王俊峰.煤地下自燃时覆岩中氡气运移规律及应用研究[D].太原:太原理工大学,2010.WANG Junfeng.Radon migration in overlying strata during spontaneous combustion of coal underground and its application[D].Taiyuan:Taiyuan University of Technology,2010.
[14] XUE S,WANG J,XIE J,et al.A laboratory study on the temperature dependence of the radon concentration in coal[J].International Journal of Coal Geology,2010,83(1):82-84.
[15] 刘艳.煤升温氧化过程中氡的析出与自然发火指标气体关系的实验研究[D].太原:太原理工大学,2007.LIU Yan.Experimental study on the relationship of radon emanation and mark gases in the process of coal oxidation[D].Taiyuan:Taiyuan University of Technology,2010.
[16] ETIOPE G,MARTINELLI G.Migration of carrier and trace gases in the geosphere:An overview[J].Physics of the Earth & Planetary Interiors,2002,129(3):185-204.
[17] KRISTIANSSON K,MALMQVIST L.Trace elements in the geogas and their relation to bedrock composition[J].Geoexploration,1987,24(6):517-534.
[18] MALMQVIST L,KRISTIANSSON K.A physical mechanism for the release of free gases in the lithosphere[J].Geoexploration,1985,23(4):447-453.
[19] MALMQVIST L,ISAKSSON M,KRISTIANSSON K.Radon migration through soil and bedrock[J].Geoexploration,1989,26(2):135-144.
[20] 谢和平,周宏伟,薛东杰,等.煤炭深部开采与极限开采深度的研究与思考[J].煤炭学报,2012,37(4):535-542.XIE Heping,ZHOU Hongwei,XUE Dongjie,et al.Research and consideration on deep coal mining and critical mining depth[J].Journal of China Coal Society,2012,37(4):535-542.
[21] SAFFARI Amir,SERESHKI Farhang,ATAEI Mohammad,et al.Presenting an engineering classification system for coal spontaneous combustion potential[J].International Journal of Coal Science & Technology,2017,4(2):110-128.
[22] ONIFADE M,GENC B.Modelling spontaneous combustion liability of carbonaceous materials[J].International Journal of Coal Science & Technology 2018,5(2):191-212.
[23] DENG J,XIAO Y,LI Q,et al.Experimental studies of spontaneous combustion and anaerobic cooling of coal[J].Fuel,2015,157:261-269.
[24] WEN H,YU Z,DENG J,et al.Spontaneous ignition characteristics of coal in a large-scale furnace:An experimental and numerical investigation[J].Applied Thermal Engineering,2017,114:583-592.
[25] LU W,CAO Y J,CTIEN J.Method for prevention and control of spontaneous combustion of coal seam and its application in mining field[J].International Journal of Mining Science and Technology,2017,27(5):839-846.
[26] 赵耀江,邬剑明.测氡探火机理的研究[J].煤炭学报,2003,28(3):260-263.ZHAO Yaojiang,WU Jianming.Study on mechanism of detecting underground fire by radon measurement technique[J].Journal of China Coal Society,2003,28(3):260-263.
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