CIESC Journal ›› 2017, Vol. 68 ›› Issue (5): 2155-2161.DOI: 10.11949/j.issn.0438-1157.20161678

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Pressurized catalytic gasification of high ash fusion temperature coal: catalytic activity of K2CO3 and potassium recovery

CHEN Zhaohui1,2, LIU Lei1, JIN Yadan1, WU Lifeng1, WU Heng1, ZHAN Yueping1, LI Kezhong1, BI Jicheng1,3   

  1. 1 State Key Laboratory of Coal-based Low Carbon Energy, ENN Group, Langfang 065001, Hebei, China;
    2 Department of Chemical Engineering, Tsinghua University, Beijing 100084, China;
    3 State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, Shanxi, China
  • Received:2016-11-28 Revised:2017-02-07 Online:2017-05-05 Published:2017-05-05
  • Supported by:

    supported by the National Basic Research Program of China (2011CB201305).

高灰熔点煤的加压催化气化:K2CO3催化活性及钾回收特性

陈兆辉1,2, 刘雷1, 金亚丹1, 吴丽锋1, 武恒1, 湛月平1, 李克忠1, 毕继诚1,3   

  1. 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
  • 通讯作者: 李克忠
  • 基金资助:

    国家重点基础研究发展计划项目(2011CB201305)。

Abstract:

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℃ and loading of 15% K2CO3, the carbon conversion reached 96.1% and CH4 yield was 0.24 m3·(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%.

Key words: coal, catalytic gasification, K2CO3, methane, recovery, digestion

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K2CO3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K2CO3能够促进碳的转化,随着K2CO3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,K2CO3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%。

关键词: 煤, 催化气化, 碳酸钾, 甲烷, 回收, 消解

CLC Number: