基于多元变量的综放采空区温度场特征研究  

Study on Temperature Field Characteristics of Fully Mechanized Caving Goaf Based on Multivariate Variables

作　　者：刘卫方 LIU Weifang(Changzhi Suburb Sanyuan Nanyao Ji'an Coal Industry Co.,Ltd.of Shanxi)

机构地区：[1]山西长治郊区三元南耀吉安煤业有限公司

出　　处：《现代矿业》2022年第11期228-231,236,共5页Modern Mining

基　　金：“十三五”国家重点研发计划项目(编号:2017YFC1503100);内蒙古自治区自然科学基金项目(编号:2020MS05010);内蒙古自治区高等学校科学研究项目(编号:NJZZ21025)。

摘　　要：为了探究在不同供风条件与推进速度下综放采空区温度场分布特征,分析采空区遗煤低温氧化过程中的温度变化规律,以布尔台煤矿42201综放采空区为研究对象,通过构建采空区—流场、氧浓度场和温度场控制方程,利用FLUENT软件对42201综放采空区遗煤低温氧化过程进行了三维数值模拟研究,确定了42201工作面合理配风量为1920 m^(3)/min,合理推进速度为4 m/d;同时,通过现场温度与氧气浓度监测,可较好地实现了控制采空区遗煤自燃发展进程。研究结果表明:工作面开采初期,采空区煤的最高温度在走向方向上升温速率先快后慢,达到最值点后逐渐下降;工作面供风量越大采空区遗煤高温点逐渐向采空区内部移动,温度越高;加快推进速度可使采空区遗煤的最高温度降低。In order to explore the distribution characteristics of the temperature field in the fully mechanized caving goaf under different air supply conditions and advancing speeds,and to understand the temperature change law in the process of low-temperature oxidation of the coal left in the gob,the 42201 fully mechanized caving goaf of Buertai Coal Mine was taken as the study object.The gob-flow field,oxygen concentration field and temperature field control equations were constructed,and the three-dimensional nu⁃merical simulation of the low-temperature oxidation process of the coal remaining in the 42201 fully mecha⁃nized caving goaf was carried out by using the FLUENT software,and the reasonable air distribution volume of the 42201 working face was determined as 1920 m^(3)/min,and the reasonable advancing speed is 4 m/d.At the same time,the monitoring of the on-site temperature and oxygen concentration can better control the development process of spontaneous combustion of coal leftovers in the goaf.The study results show that in the initial stage of working face mining,the heating rate of the maximum coal temperature in the gob is first fast and then slow in the direction of the trend,and then gradually decreases after reaching the maximum point.When the gob moves inside,the temperature is higher.Speeding up the advancing speed can reduce the maximum temperature of the coal left in the gob.

关 键 词：煤自燃 配风量 推进度 温度场 遗煤 

分 类 号：TD752.2[矿业工程—矿井通风与安全]