水浸煤二次氧化自燃危险性实验研究

为研究水浸煤二次氧化升温和降温全过程的自燃危险性，采用程序升温实验方法对原煤、水浸煤初次及二次氧化升温和降温的自燃特性参数进行对比研究，并利用表观活化能计算模型，在直角坐标系中通过线性拟合的方法计算不同温度阶段的表观活化能。实验结果表明：在升温过程干裂温度之后和降温全过程中，煤样的耗氧速率、自燃特征气体的产生率和极限放热强度均符合水浸煤高于对应原煤、二次氧化高于对应初次氧化的规律；表观活化能方面，水浸煤低于对应原煤、二次氧化低于对应初次氧化。因此水浸煤的自燃危险性更大。

Experimental study on the risk of secondary oxidation spontaneous combustion of water immersed coal

In order to study the spontaneous combustion risk in the whole process of secondary oxidation heating and cooling of water immersed coal,the spontaneous combustion characteristic parameters of primary and secondary oxidation heating and cooling of raw coal and water immersed coal were compared by means of temperature programmed experiment.By using the apparent activation energy calculation model,the apparent activation energy of different temperature stage was calculated by linear fitting method in rectangular coordinates.The experimental results show that the oxygen consumption rate,the rate of spontaneous combustion characteristic gas production and the ultimate heat release intensity of the coal sample in the whole process of temperature rise and temperature drop after the dry-cracking temperature meet the requirements of the law that the water immersed coal is higher than the corresponding raw coal,and the secondary oxidation is higher than the corresponding primary oxidation;in terms of apparent activation energy,water immersed coal is lower than the corresponding raw coal,and secondary oxidation is lower than the corresponding primary oxidation.Therefore,the danger of spontaneous combustion of water immersed coal is greater.