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

doi:10.11949/j.issn.0438-1157.20161678

Abstract

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:

TQ530.2

CHEN Zhaohui, LIU Lei, JIN Yadan, WU Lifeng, WU Heng, ZHAN Yueping, LI Kezhong, BI Jicheng. Pressurized catalytic gasification of high ash fusion temperature coal: catalytic activity of K₂CO₃ and potassium recovery[J]. CIESC Journal, 2017, 68(5): 2155-2161.

陈兆辉, 刘雷, 金亚丹, 吴丽锋, 武恒, 湛月平, 李克忠, 毕继诚. 高灰熔点煤的加压催化气化：K₂CO₃催化活性及钾回收特性[J]. 化工学报, 2017, 68(5): 2155-2161.

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

高灰熔点煤的加压催化气化：K₂CO₃催化活性及钾回收特性

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