空气流量下易燃煤层采空区遗煤氧化升温特性研究  

Study on oxidation and heating characteristics of residual coal in goaf of flammable coal seam under air flow

作　　者：左秋玲 李景山[2] ZUO Qiuling;LI Jingshan(College of Safety Engineering, Henan University of Engineering, Zhengzhou 451191, China;Department of Public Security, Railway Police College, Zhengzhou 450053, China)

机构地区：[1]河南工程学院安全工程学院,河南郑州451191 [2]铁道警察学院治安学系,河南郑州450053

出　　处：《河南工程学院学报（自然科学版）》2020年第3期21-25,共5页Journal of Henan University of Engineering：Natural Science Edition

基　　金：国家自然科学基金资助项目(51904089)。

摘　　要：为研究空气流量对采空区遗煤自燃的影响,基于九宫格原理设计了易燃煤层采空区的漏风通道,借助自行搭建的实验平台进行了煤自燃氧化升温实验,分析煤样耗氧速率和放热强度随煤温变化的规律。结果表明:考虑煤样空隙率时,耗氧速率有3次较为明显的峰值,第一次峰值出现在48℃左右,第二次峰值出现在75℃左右,第三次峰值出现在105℃左右;不考虑煤样空隙率时,大空气流量下,耗氧速率的3次峰值均高于第一种方法计算出的耗氧速率,在小空气流量下,耗氧速率的峰值差别不大;80℃之后,实验煤样生成的热量开始占据主导地位,放热强度与温度呈指数变化。可根据实验结果调节矿井的漏风量,来防治井下采空区的遗煤自燃。In order to study the influence of air flow rate on spontaneous combustion of coal in goaf,the air leakage passage of goaf in inflammable coal seam is designed based on the principle of Sudoku grid.The temperature rise of auto-ignition oxidation of coal is studied using a self-built experimental platform.By changing the air flow rate,the laws of the change of oxygen consumption rate and heat release intensity with the coal temperature are analyzed.The results show that the oxygen consumption rate has three obvious peaks when the voidage of coal is taken into account.The first peak is about 48℃.The second peak is about 75℃.The third peak occurred at about 105℃.When the voidage of coal sample is not taken into account,the third peak of oxygen consumption rate is higher than that calculated by the first method at large air flow rate.But under the condition of small air flow,the peak value of oxygen consumption rate has little difference.After 80℃,the heat generated from the coal samples begun to dominate.The exothermic intensity changes exponentially with temperature.According to the experimental results,the air leakage can be controlled to prevent and control the spontaneous combustion of coal in underground goaf.

关 键 词：煤氧化 漏风通道 九宫格 

分 类 号：TD8[矿业工程—矿山开采]