K-Fe复合催化剂对煤半焦气化速率与产物的影响  

Effects of composite potassium-iron catalyst on coal semi-coke gasification rate and product gas

作　　者：厉文榜 方梦祥[1] 岑建孟[1] 肖平[2] 时正海[2] 山石泉 王勤辉[1] 骆仲泱 

机构地区：[1]浙江大学能源清洁利用国家重点实验室,浙江杭州310027 [2]华能国际电力股份有限公司,北京100031

出　　处：《浙江大学学报（工学版）》2016年第9期1746-1751,共6页Journal of Zhejiang University：Engineering Science

基　　金：中央高校基本科研业务费专项资金资助项目(2015QNA4013)

摘　　要：在热天平与固定床反应器中研究K-Fe复合催化剂对煤半焦的催化气化特性,并考察K-Fe催化剂种类、K-Fe配比与气化温度对气化过程的影响,分析反应过程中碳转化速率和气体产物（H2、CO和CO2）的变化规律.结果表明：K-Fe复合催化剂具有良好的催化作用,兼单一催化剂提高气化反应效率与调节气体产物组成的功能;在850℃时,碳转化速率比无催化剂时提高了3.2-4.8倍,产品气中H2产率提高了6.4%-12.6%、CO产率提高了5.8%-22.3%;复合催化剂中提高气化速率的原因主要是K,而Fe对气体产物组成的影响更大;高温会显著加快气化反应过程,促进CO生成,使H2及CO2产率降低,在850℃及更高温度时,升温对反应速率的促进作用逐渐降低.The performance of K-Fe composite catalysts during coal semi-coke gasification was studied with thermal gravimetric analysis （TGA） and a fixed-bed reactor. The effects of K-Fe catalyst type, K-Fe ratio and gasification temperature on the carbon conversion efficiency and product gas composition （i. e. ratios of H2,CO and CO2） were investigated. Results indicate that K-Fe composite catalysts exhibit excellent cata-lytic performance by combining the high efficiency of gasification and the ability to affect the product gas. The carbon conversion efficiency with K-Fe catalyst is 3. 2 to 4. 8 times higher than that of non-catalytic process. The yield of high quality product gas such as H2 and CO is significantly improved by 6. 4 % to 12. 6% and 5.8% to 22. 3 % , respectively. Potassium plays a major role in determining the gasification ef-ficiency while iron dominate the product gas composition. High gasification temperature significantly accel-erates the gasification process and the generation of CO, but reduces the production of H2 and CO2. The effects of temperature on gasification rate start to saturate when temperature gets higher than 850 ℃ .

关 键 词：煤半焦 催化剂 催化气化 碱金属 过渡金属 

分 类 号：TQ546[化学工程—煤化学工程]