In order to study the effect of air volume on coal spontaneous combustion limit parameters,we use coal spontaneous combustion program temperature test device to make this study,the oxygen consumption rate,CO,CO2 production rate and exothermic strength of coal samples under five different air volume conditions were analyzed.We calculate the coal spontaneous combustion limit parameters and analyze the variation law on this basis.Study shows that the different air supply leads to different degrees of oxidative exothermic strength of the coal,in the case of the air flow of 60 mL/min,the exothermic intensity of the medium reaches a maximum;the variation of spontaneous combustion limit parameters of coal can be divided into two stages:the air volume is less than 40 mL/min,the minimum floating coal thickness and the lower oxygen concentration of coal samples decrease with the increase of air volume,the upper air leakage intensity of the coal sample increases with the increase of the air volume;when the air volume is more than 40 mL/min,the minimum floating coal thickness and the lower limit oxygen concentration increase linearly with the increase of air volume,and the upper limit air leakage intensity decreases linearly with the increase of air volume.We need to pay attention to the regulation of the air volume in the underground mining process,so that the ignition parameters of coal are not conducive to the development direction of spontaneous combustion.%为了研究不同的风量条件对煤自燃极限参数的影响,采用煤自燃程序升温实验系统,测试了5种不同风量条件下煤样的耗氧速率、CO产生率、CO2产生率和放热强度,在此基础上计算煤自燃极限参数并分析其变化规律.实验结果表明:不同的供风量导致煤体的氧化放热强度不同,在风量为60 mL/min的情况下煤体放热强度最大;煤自燃极限参数随风量的变化可以分为2个阶段:风量在40 mL/min之前,煤样的最小浮煤厚度和下限氧浓度均随风量的增加而减小,煤样的上限漏风强度随风量的增加而增加.风量在40 mL/min之后,最小浮煤厚度和下限氧浓度随风量的增加近似呈线性增加,上限漏风强度随风量的增加近似呈线性减小,说明在井下开采过程中要注意风量的调节,使煤的自燃极限参数向不利于煤自燃的方向发展.
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