化工学报2011，Vol.62Issue(1)：192-198,7.
碱金属对煤热解和气化反应速率的影响
Effect of alkali metal on rate of coal pyrolysis and gasification
摘要
Abstract
The effect of alkali metal (AM) on crystallite structure of chars prepared by the pyrolysis of original and acid-washed coal without and with AM at 800-1050℃ in tubular furnace was investigated by XRD (X-ray diffraction) technique. The pyrolysis of coal samples and the gasification of chars were studied by PTGA (pressurized thermogravimetric analysis). The results show that both coal pyrolysis and gasification is affected by AM. At pyrolysis stage, the existence of AM inhibits the progress of char graphitizing, promotes the pyrolysis reaction and reduces its activation energy; at char gasification stage,AM is a catalyst, reduces gasification activation energy, goes up rate and prolongs the time to reach the maximum gasification rate. Modified random pore model can be used to describe the char-CO2 gasification process properly.关键词
碱金属/煤热解/煤气化/反应速率Key words
alkali metal/ coal pyrolysis/ coal gasification/ reaction rate分类
化学化工引用本文复制引用
熊杰,周志杰,许慎启,于广锁..碱金属对煤热解和气化反应速率的影响[J].化工学报,2011,62(1):192-198,7.基金项目
国家自然科学基金项目(20876048) （20876048）
国家高技术研究发展计划项目(2008AA05Z310). （2008AA05Z310）
