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  

Transformation of K_2CO_3 as a catalyst during coal char pyrolysis and its effect on coal char catalytic gasification

作　　者：王西明[1] 竹怀礼 王兴军[1,2] 刘海峰[1,2] 于广锁 王辅臣[1,2] 

机构地区：[1]华东理工大学煤气化及能源化工教育部重点实验室,上海200237 [2]上海煤气化工程技术研究中心,上海200237

出　　处：《燃料化学学报》2014年第2期175-180,共6页Journal of Fuel Chemistry and Technology

基　　金：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。The transformation of K2CO3 in the course of Shenfu char catalytic pyrolysis under differenttemperatures was studied in the fixed-bed reactor; the influence of loading methods of K2CO3 and particle size ongasification reactivity was investigated in a TG-DSC analytical reactor. The results showed that with the increaseof temperature, the effect of loading methods on gasification rate is weakened; K catalyst shows high dispersityby means of SEM / EDX analysis of pyrolysis residue. CO2 and CO are produced through the interaction ofK2CO3 and coal char in the pyrolysis and there is a linear relation between the amount of released gas andtemperature. The particle size of K2CO3 and coal char has notable impact on gasification; the gasification rateincrease with a thinner particle at 650 ℃. K2CO3 shows high mobility within the coal char phase at elevatedtemperature, which is consistent with its catalytic activities; the effect of loading methods on gasification shouldbe considered under a temperature below 700 ℃.

关 键 词：碳酸钾 流动 催化气化 添加方式 粒径 

分 类 号：TQ546[化学工程—煤化学工程]