平煤六矿戊_(9-10)煤层自燃特性与采空区“三带”数值模拟研究

Numerical Simulation Study on Spontaneous Combustion Characteristicsand"Three Zones"of Goaf inⅤ_(9-10)Coal Seam of Pingdingshan CoalMine No.6

为研究综采面采空区煤自燃防治问题,以平煤股份六矿戊_(9-10)-22290回采工作面为例,通过实验分析、数值模拟,分析研究了自燃标志性气体和自燃特性以及采空区自燃“三带”的分布情况。结合煤层赋存情况以及程序升温实验结果,煤自燃潜伏期,选取CO作为预测预报标志气体;加速氧化阶段可选取CO和C_(2)H_(4)作为标志气体;计算判定戊_(9-10)煤层为自燃煤层;构建了采空区自燃“三带”模拟的数值模型,利用Comsol软件对采空区自燃“三带”进行了数值模拟,并与现场实测结果进行对比分析,验证了模型的正确性,为类似条件工作面采空区自燃火灾防治提供了科学依据。

In order to study the prevention and control of coal spontaneous combustion in goaf of fully mechanized mining face,taking theⅤ_(9-10)-22290 mining face of Pingdingshan coal mine No.6 as an example,experimental analysis and numerical simulation were conducted to analyze and study the characteristic gases and characteristics of spontaneous combustion,as well as the distribution of the"three zones"of spontaneous combustion in goaf.Based on the occurrence of coal seams and the results of programmed heating experiments,the latent period of coal spontaneous combustion is determined,and CO is selected as the predictive marker gas;CO and C_(2)H_(4) can be selected as marker gases during the accelerated oxidation stage;calculate and determine that theⅤ_(9-10)coal seam is a spontaneous combustion coal seam;a numerical model for simulating the"three zones"of spontaneous combustion in goaf was constructed.Comsol software was used to numerically simulate the"three zones"of spontaneous combustion in goaf,and the results were compared and analyzed with on-site measurements to verify the correctness of the model.This provides a scientific basis for the prevention and control of spontaneous combustion fires in goaf under similar working conditions.