高灰熔点煤的加压催化气化:K_2CO_3催化活性及钾回收特性  

Pressurized catalytic gasification of high ash fusion temperature coal: catalytic activity of K_2CO_3 and potassium recovery

作　　者：陈兆辉[1,2] 刘雷 金亚丹 吴丽锋 武恒 湛月平 李克忠 毕继诚[1,3] 

机构地区：[1]新奥科技发展有限公司煤基低碳能源国家重点实验室,河北廊坊065001 [2]清华大学化学工程系,北京100084 [3]中国科学院山西煤炭化学研究所煤转化国家重点实验室,山西太原030001

出　　处：《化工学报》2017年第5期2155-2161,共7页CIESC Journal

基　　金：国家重点基础研究发展计划项目(2011CB201305)~~

摘　　要：以高灰熔点煤和含钾催化剂的灰渣为研究对象,分别考察了加压固定床反应器中K_2CO_3催化半焦水蒸气气化的反应性和灰渣中钾催化剂的回收特性。实验结果表明煤中添加K_2CO_3能够促进碳的转化,随着K_2CO_3负载量和气化温度的增加,碳转化率增大,CH4收率增加。在3.5 MPa和800℃下,K_2CO_3负载量为15%时,碳转化率达到96.1%,CH4收率达到0.24 m3·(kg C)-1。灰渣中钾催化剂的回收率随碳转化率的增加先升高后减小,这与催化剂在灰渣中的存在方式有关。通过优化水洗和消解条件,高碳转化率下灰渣中的钾催化剂的总回收率高达96.5%。In this study, catalytic steam gasification of high ash fusion temperature coal using K2CO3 as catalyst was carried out in a pressurized fixed bed. The potassium catalyst recovery was also conducted via wash and digestion by Ca（OH）2. It turned out that increasing temperature and K2CO3 loading enhanced the carbon conversion and CH4 yield. At 800~C and loading of 15% K2CO3, the carbon conversion reached 96.1% and CH4 yield was 0.24 m^3 · （kg C）^-1. The potassium recovery increased to a peak as the carbon conversion rose and then declined, which was more relevant to existing forms of potassium with carbon and ash. By optimizing the conditions of wash and digestion, the potassium recovery in ash with high carbon conversion reached 96.5%.

关 键 词：煤 催化气化 碳酸钾 甲烷 回收 消解 

分 类 号：TQ530.2[化学工程—煤化学工程]