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K_2CO_3催化剂在煤焦热解中的形态转变及其对煤焦催化气化的影响
引用本文:王西明,竹怀礼,王兴军,刘海峰,于广锁,王辅臣.K_2CO_3催化剂在煤焦热解中的形态转变及其对煤焦催化气化的影响[J].燃料化学学报,2014,42(2):175-180.
作者姓名:王西明  竹怀礼  王兴军  刘海峰  于广锁  王辅臣
作者单位:1. Key Laboratory of Coal Gasification and Energy Chemical Engineering of Ministry of Education, East China University of Science & Technology, Shanghai 200237, China; 2. Shanghai Engineering Research Center of Coal Gasification, Shanghai 200237, China
基金项目:国家重点基础研究发展规划(973计划,2010CB227000)
摘    要:在固定床中考察了不同温度下神府煤焦催化热解中K2CO3的转变形态,以及在TG-DSC分析仪上研究了K2CO3添加方式和粒径对其气化速率的影响。结果表明,随着气化温度的升高,催化剂的添加方式对煤焦气化反应速率的影响减弱;对热解残渣的SEM/EDX谱图显示,随着温度升高,K催化剂在煤焦中能展现更好的分散性;在热解过程中,煤焦中的碳通过与K2CO3反应释放出CO2和CO,生成的气体量与温度相关;在较低温度650℃下,不同粒径对气化效果影响差别较大,粒径越小气化反应性越好。K2CO3的流动性随着温度升高而增强,催化活性也越强;低于700℃时,要考虑添加方式对气化反应性的影响。

关 键 词:碳酸钾  流动  催化气化  添加方式  粒径  
收稿时间:2013-06-28

Transformation of K2CO3 as a catalyst during coal char pyrolysis and its effect on coal char catalytic gasification
WANG Xi-ming,ZHU Huai-li,WANG Xing-jun,LIU Hai-feng,YU Guang-suo,WANG Fu-chen.Transformation of K2CO3 as a catalyst during coal char pyrolysis and its effect on coal char catalytic gasification[J].Journal of Fuel Chemistry and Technology,2014,42(2):175-180.
Authors:WANG Xi-ming  ZHU Huai-li  WANG Xing-jun  LIU Hai-feng  YU Guang-suo  WANG Fu-chen
Abstract:The transformation of K2CO3 in the course of Shenfu char catalytic pyrolysis under different temperatures was studied in the fixed-bed reactor; the influence of loading methods of K2CO3 and particle size on gasification reactivity was investigated in a TG-DSC analytical reactor. The results showed that with the increase of temperature, the effect of loading methods on gasification rate is weakened; K catalyst shows high dispersity by means of SEM/EDX analysis of pyrolysis residue. CO2 and CO are produced through the interaction of K2CO3 and coal char in the pyrolysis and there is a linear relation between the amount of released gas and temperature. The particle size of K2CO3 and coal char has notable impact on gasification; the gasification rate increase with a thinner particle at 650 ℃. K2CO3 shows high mobility within the coal char phase at elevated temperature, which is consistent with its catalytic activities; the effect of loading methods on gasification should be considered under a temperature below 700 ℃.
Keywords:potassium carbonate  mobility  catalytic gasification  loading method  particle size  
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