低氧气氛下混煤自燃倾向性研究  

Spontaneous combustion tendency of blended coals in low oxygen environment

作　　者：马金凤[1] 黄新章[1] 薛治家[1] 李洪涛[2] 李楠[1] 

机构地区：[1]沈阳工程学院能源与动力学院,辽宁沈阳110136 [2]河北科技大学机械工程学院,河北石家庄050018

出　　处：《沈阳工程学院学报（自然科学版）》2016年第2期118-121,125,共5页Journal of Shenyang Institute of Engineering:Natural Science

摘　　要：在低氧气氛下利用热分析技术进行了高挥发分混煤的慢速氧化特性实验,借助动力学分析理论,计算得出低温阶段的动力学参数。计算结果表明,活化能和指前因子随着反应过程的深入而增加,与单煤相比,高挥发分混煤的自燃倾向性发生改变。实验结果表明,吸氧增重阶段主要为物理吸附,氧化放热量很少;混煤的挥发分析出较单煤提前,着火温度介于单煤之间。如果制粉系统中含氧量低于16%,可以达到高挥发分混煤的防爆效果。Experiment of oxidation characteristics with slow velocity of high volatile blended coals was investigated in the surroundings of low oxygen conditions,which gave three kinetic factors in the step of low temperature. The results of calculation show that the activation energy and pre-exponential factor increase with the reaction process and tendency of spontaneous combustion of the blended coal have changed. The experimental results show that the type of absorbing oxygen is mainly physical adsorption and calorific value is very small during increasing weight. Volatile of blended coal releases before single coal and combustion temperature of blended coal is betw een one and other single coals. If the oxygen content is below 16% in the milling system,explosion-proof effect on high volatile blended coal can be obtained.

关 键 词：热分析 高挥发分 混煤 动力学理论 

分 类 号：TK124[动力工程及工程热物理—工程热物理] TK224.1[动力工程及工程热物理—热能工程]