机械力作用下煤结构破断CO释放规律及自燃预测指标修正方法

Release laws of CO produced by coal structure destruction under mechanical force and modification method of the index for predicting coal spontaneous combustion

为有效区分采煤过程中机械力作用下煤机械破断CO的产生规律和释放量,利用自制粉碎实验装置开展煤机械破断实验,实验从煤样质量、电机转速和粉碎气氛3个方面进行.结果表明:CO体积分数上升速率、出现时间及绝对产生量随煤样质量、电机转速增加而增加,空气气氛下煤样CO体积分数平均上升速率高于氮气气氛下煤样.在4min粉碎时间内,机械力破断煤结构产生CO绝对产生量与煤样量呈线性关系.基于实验结果,建立工作面落煤模型,并推导出落煤过程中因机械力破断煤结构产生CO体积分数计算公式,计算结果可作为预测指标修正值对煤自燃预测预报结果进行修正.

In order to make clear the release laws and release amount of CO which is produced by the coal structure destruction under mechanical force, a self-designed crushing experimental equipment was used to conduct the coal crushing experiment, and three factors were concerned, the quality of coal sample, the speed of motor and the crushing atmosphere. The experimental results show that the rise rate and occurrence time and absolute amount of CO concentration all increase with the increasing of the quality of coal sample and the speed of motor. The average rise rate of CO concentration in air atmosphere is higher than it in nitrogen atmosphere. In 4 minutes＇ crush, the absolute amount of CO produced by the coal structure destruction under mechanical force has a linear relation with the quality of coal sample. Based on the experimental results, a working face model was established and a calculation formula of CO produced by the coal structure destruction under mechanical force during the drop process was derived. The calculation result can be used to modify the forecast index of coal spontaneous combustion.