用热重法研究不同煤种的多段加氢热解过程  

Thermogravimetric Analysis of Multi-Stage Hydropyrolysis of Different Coals

作　　者：李文[1] 王娜[1] 李保庆[1] 

机构地区：[1]中国科学院山西煤炭化学研究所煤转化国家重点实验室,山西太原030001

出　　处：《中国矿业大学学报》2001年第5期449-452,457,共5页Journal of China University of Mining & Technology

基　　金：国家自然科学基金资助项目 ( 2 9936 0 90 )

摘　　要：在了解煤加氢热解特性的基础上 ,对不同煤种的多段加氢热解过程进行了热重分析 ,结果表明 :在煤加氢热解峰温附近的停留能显著增加煤的转化率 ,这主要是因为氢气的供应与自由基的生成速率的充分匹配 ;采用快速升温多段停留的工艺可以达到慢速升温时的转化率 ,可节省反应时间并增加油的收率 ;不同煤种的多段停留效果取决于煤本身的结构特点 ,具有较高 H/C比的煤的多段停留效果较显著 ,说明外在氢的存在促进了煤中内在氢与自由基的反应 .多段加氢热解过程可提高煤的脱硫率。Based on the characteristic of hydropyrolysis-HyPy, a multi-stage MHyPy of different coals was investigated by using thermogravimetry. The results show that keeping the near peak temperature for some time in HyPy process can obviously increase the conversion rate, which is believed due to the full match between formation rate of free radicals and supply of hydrogen. The fast heating in MHyPy process results in the same conversion rate as that of the slow heating in HyPy process, which leads to the less reaction time and high yield of oil. The effect of MHyPy depends on the coal structure itself and it is notable for the coal with high H/C ratio. This suggests that the external hydrogen promotes the reaction between instinct hydrogen and free radicals. The MHyPy improves the removal of sulfur and nitrogen.

关 键 词：煤 多段加氢热解 热重 焦油 

分 类 号：TQ522.6[化学工程—煤化学工程]