煤催化气化过程中钾的迁移及其对气化反应特性的影响  

Transformation of potassium during catalytic gasification of coal and the effect on gasification

作　　者：陈凡敏[1] 王兴军[1] 王西明[1] 周志杰[1] 

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煤气化工程技术研究中心,上海200237

出　　处：《燃料化学学报》2013年第3期265-270,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：在固定床反应器中研究了钾在热解和水蒸气气化过程中的变迁,并在TG-DSC上考察了钾系催化剂对煤焦水蒸气气化的催化效果以及随钾化合物形态变化的关系。结果表明,干混法和浸渍法添加碳酸钾对煤焦水蒸气气化的催化效果显著,煤焦的气化反应性随着钾添加量的增加而增大,当催化剂添加到一定量时催化效果陡增,同时神府煤钾的负荷饱和添加量为10%。在煤样热解和气化过程中,钾的化学形态会发生变化,发现并定量了还原态钾中间体的生成。在气化过程中碳酸钾的催化规律和还原态钾中间体的数量之间存在对应关系,当碳转化率为0.2～0.4时,气化速率和还原态钾中间体的数量达到最大值。在700～800℃,钾系催化剂的催化作用和还原态钾中间体的数量之间也存在对应关系,即碳酸钾催化效果较好,氯化钾的催化效果较差,硫酸钾的催化效果随温度的变化明显。The transformation of potassium during pyrolysis and gasification was studied in a fixed bed. The effects of potassium based catalyst on the steam gasification reactivity and the transformation of potassium were investigated by TG-DSC. Results show that all the potassium carbonate loaded by either impregnation or mechanical mixing has a marked catalytic effectiveness. The reactivity of Shenfu char increases with potassium loadings up to a saturation loading of about 10%. The catalytic effect has a maximum value. The transformation of potassium and the amount of potassium intermediate have been confirmed during pyrolysis and gasification. And the reactivity of chars depends on the amount of potassium intermediate. Potassium carbonate has an obvious catalytic effect, and potassium chloride has a poor catalytic effect. However, the catalytic effect of potassium sulfate increases obviously with the increasing of temperature in the range of 700 - 800 ℃.

关 键 词：催化气化 碳酸钾 氯化钾 硫酸钾 钾变迁 

分 类 号：TQ54[化学工程—煤化学工程]