煤高温快速液化影响因素的研究

Influencing factors on quick coal liquefaction at high temperature

用17mL微型盐浴共振搅拌反应釜研究了煤高温快速液化。结果表明,煤阶低且含矿物质少的烟煤液化性能较好;转化率主要受溶剂供氢性能的影响;氢气所做贡献很小,与氮气气氛下的转化率基本一样;催化剂作用不明显;煤的粒径对转化率影响不大,反应器振动影响较大。综合结论分析其机理为,在煤的一次热分解温度范围的高温段,一般在500℃附近,低变质程度烟煤结构中的桥键可充分断裂,形成大量自由基,用足量优秀供氢溶剂作氢源,可有效稳定自由基,形成液体产物,在几十秒钟到几分钟的时间内就达到很高的转化率。

Quick coal liquefaction at high temperature（QCLHT）was studied by using a 17mL tubular resonance agitation micro-autoclave reactor.The results show that a low rank bituminous coal containing little mineral matter exhibits good liquefaction performance.The conversion is mainly influenced by hydrogen-donating ability of solvent and contribution of H2 is negligible.The conversion under N2 atmosphere is basically equal to that under H2 atmosphere.Effect of catalyst is not remarkable.Coal particle size has little influence on conversion,whereas vibration of reactor has important influence.Based upon the above conclusions,the reaction mechanism of QCLHT was suggested.At high temperature zone of the primary pyrolysis of coal,usually near 500℃ or so,bridge bonds in its structure are sufficiently broken for low rank bituminous coal,and large amounts of free radicals are thus formed.If enough excellent hydrogen donor solvent is used as hydrogen source,the free radicals could be stabilized and formed into liquid product.Hence,rather high conversion is achieved within dozens of seconds or a few minutes.