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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 effectively distinguish the generation regularity and release amount of CO under the mechanical force during the coal mining process, the coal mechanical rupture experiment was carried out by the self-made pulverization experimental apparatus, and the experiment was conducted from the aspects of the quality of the coal sample, the motor speed and the pulverized atmosphere. It shows that the rising rate of CO volume fraction, the appearance time and the absolute amount of CO increase with the increase of the mass of the coal sample and the motor speed, and the average increase rate of the CO volume fraction of the coal sample in the air atmosphere is higher than that in the nitrogen atmosphere. Based on the experimental results, the coal model of coal face is set up and the calculation formula of CO volume fraction caused by mechanical broken coal structure during coal falling is deduced. The result can be used as a correction value of forecast index to correct the forecast result of coal spontaneous combustion.