不同煤阶煤自燃特性的实验研究
Experimental Study on Spontaneous Combustion Characteristics of Different Rank Coals
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摘要: 为了研究不同煤阶煤的自燃特性,以HM褐煤、ZX长焰煤、DHS气煤、DL瘦煤、ZLS无烟煤为研究对象,利用程序升温仪和热重分析仪,对5种煤样进行气态产物、热效应和动力学特征进行分析。实验结果表明:低温氧化阶段,CO、CO2生成量和初始产生温度随着变质程度的降低而显著增强;低温阶段放热强度的顺序依次为HM褐煤>ZX长焰煤>金塔气煤>ZLS无烟煤>DL瘦煤,活化能的顺序为HM褐煤Abstract: To study the spontaneous combustion characteristics of different rank coals, HM lignite, ZX long flame coal, DHS gas coal, DL lean coal, ZLS anthracite coal were taken as research objects, and the parameters of five coal samples were measured by temperature programmed experiment and thermogravimetric analysis experiment. The gaseous products, heating effect change and kinetic parameters of 5 coal samples were analyzed. The experimental results show that in the low temperature oxidation stage, the amount of CO and CO2 production and the initial production temperature increase significantly with the decrease of the metamorphism degree; the order of mass loss and heat release at low temperature is the HM lignite > ZX long flame coal > Jinta gas coal > ZLS anthracite> DL lean coal. The order of the activation energy is HM lignite < ZX long flame < Jinta gas coal < ZLS anthracite < DL lean coal. The activation energy increase significantly with the increase of the degree of coal metamorphism. ZLS anthracite has higher pyrite content(S>3%), so its heat release intensity and activation energy at low temper-ature stage are higher than DL lean coal.
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