供风量对褐煤自燃特性参数影响的实验研究

为研究煤自燃时期生成气体对诱发瓦斯爆炸的影响,选取瑞安煤业4^#煤层褐煤为实验煤样,通过管式炉程序升温和色谱分析仪研究供风量为40、120、200 mL/min时对煤自燃时期生成气体的影响,得到不同温度条件下管式炉出口O2、CO、CO2气体摩尔浓度,并计算了褐煤低温氧化阶段耗氧速率、气体生成速率和放热强度与煤样温度之间的关系。结果表明:随着温度升高,煤样的耗氧速率、CO生成速率、CO2生成速率、放热强度与温度之间均呈指数关系变化;煤样的耗氧速率与放热强度呈线性递增关系,相同耗氧速率下,当供风量为120 mL/min时放热强度最大,当供风量为200 mL/min时放热强度最小。

Experimental study on the influence of air supply on characteristics of lignite spontaneous combustion

In order to study the influence of gas generated during coal spontaneous combustion on gas explosion,the lignite of 4^# coal seam in Ruian Coal Industry was selected as experimental coal sample.When the air supply was 40 mL/min,120 mL/min and 200 mL/min respectively,the influence of it on the gas generation during coal spontaneous combustion was studied by tube furnace temperature program and chromatographic analyzer.The molar concentrations of O2,CO and CO2 at the outlet of tubular furnace at different temperatures were calculated.The relationship between oxygen consumption rate,gas generation rate,exothermic intensity and coal sample temperature in the low temperature oxidation stage of lignite were calculated.The results show that with the increase of temperature,the oxygen consumption rate,CO generation rate,CO2 generation rate,exothermic intensity and temperature change exponentially;the oxygen consumption rate and the exothermic intensity increase linearly,at the same oxygen consumption rate,the exothermic intensity is the maximum when the air supply is 120 mL/min,and the exothermic intensity is the minimum when the air supply is 200 mL/min.