热处理对肥煤热解挥发分析出特性的影响

Effect of Thermal Treatment on Pyrolysis Behavior of Fat Coal

利用热重质谱分析仪(TG-MS)对热处理后肥煤样品的热解特性进行了研究,分析了热失重变化和挥发分析出规律.结果表明:随着煤样热处理温度的升高,热解过程中挥发分总产率逐渐减少,最大失重速率逐渐降低并向高温移动.在热解过程析出的挥发分中,轻气体主要有H_2,CO,CO_2和H_2O,烃类含有脂肪烃、环烷烃及苯、甲苯和二甲苯等;随着煤样热处理温度的升高,热解过程析出的挥发分中烃类减少,最大析出率对应的温度向高温移动;轻气体挥发分析出的温度区间较宽,在300℃到800℃之间.烃类析出的温度区间较窄,在400℃到600℃之间.

Thermogravimetry-mass spectroscopy(TG-MS)analysis was used to investigate the pyrolysis behavior of raw and thermally pretreated coal samples at different temperatures.The weight loss,weight loss rate and the release of volatiles as a function of temperature were studied.The experimental results show that with increasing the pretreatment temperature of coal,the total weight loss and the maximum weight loss rate decrease and shift to higher temperatures.During pyrolysis,light gases such as H_2,CO,CO_2,H_2O and hydrocarbons including aliphatic hydrocarbons,cycloalkanes,benzene,toluene,xylene and so on,are detected by MS.With the heat treatment temperature increasing,the release of aliphatic hydrocarbon decrease,while the temperature corresponding to the maximum release rate shift to higher temperatures.The release temperature range of light gases is wider(300℃-800℃),while organic volatiles are detect in a narrower temperature range(400 ℃-600 ℃).