挥发分对煤自燃特性影响的实验研究

Experimental study for impact of volatile matter on spontaneous combustion characteristics of coal

为了研究挥发分对煤本身自燃能力的影响作用,在氮气环境中对同一处采集的煤样分别在300,600,900℃高温下进行了灼烧处理,获得了挥发分不同的5份煤样;利用自制的油浴式煤低温氧化实验系统对所得煤样进行了升温氧化实验,测得了不同温度下煤样罐出口中的O2,CO,CO2等气体的体积分数;推导了煤的耗氧速率与放热强度计算公式,结合实验数据,得到了不同煤样的耗氧速率及放热强度变化情况,以此来判断减少挥发分后煤的自燃能力强弱。结果表明,相同条件下,挥发分越低,煤的耗氧速率、放热强度越小,越不易自燃。

In order to study the influence of the volatile matter on the ability of coal spontaneous combustion, the coal samples which were collected at the same place were processed respectively at 300,600,900 ℃ in a nitrogen environ ment to get 5 coal samples which were in different volatile matter. The coal samples were carried out by the oil bath type coal low temperature oxidation experimental system, and the 02, CO, CO2 concentration at the outlet of coal sam ples tank at different temperature were measured. Then the formulas of oxygen consumption rate and heat emission in tensity were deduced respectively. By calculating the changes of the two parameters of selfignite characteristic accord ing to the test data, the spontaneous combustion ability of coal which was strong or weak after reducing volatile matter was judgment. The results show that, under the same conditions, the lesser the volatile matter content is, the smaller the oxygen consumption rate and the heat emission intensity of coal are, and the more difficult the selfignition is.