Investigations of Both Catalytic Steam Gasification of Indonesian Lanna Coal and Potassium Catalyst Recovery Using K2CO3 as a Catalyst

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• 作者：XiangZhou Yuan ; ShuMin Fan ; Liang Zhao ; Hyung-Taek Kim
• 刊名：Energy & Fuels
• 出版年：2016
• 出版时间：March 17, 2016
• 年：2016
• 卷：30
• 期：3
• 页码：2492-2502
• 全文大小：636K
• ISSN：1520-5029

文摘

The K₂CO₃-catalyzed steam gasification process of an Indonesian low-rank coal (Lanna coal) was studied, and the gasified residue was collected and used as a sample in the catalyst recovery process. The catalyst recovery process was mainly investigated by changing several operating parameters and washing methods, in order to evaluate the performance of the whole process. The shrinking core model was applicable to predict this gasification reactivity. H₂-rich syngas can reach 71.02 vol % at a gasification temperature of 800 °C with 20 wt % K₂CO₃ loading amount when the CO₂ capture efficiency was 90%, and carbon conversion (X_C) reached 87.78% simultaneously. The potassium compounds in the gasified residue were found to coexist as K₂CO₃, K₂SO₄, and KAlSiO₄. The optimal catalyst recovery efficiency (η_K) reached 84.69% by conducting three washes using the combined washing method. The variations of surface area, total pore volume, and average pore size under different washing methods were analyzed using Brunauer–Emmett–Teller and Barrett–Joyner–Halenda analyses after the catalyst recovery process was conducted. In addition, a new and advanced technology was developed that incorporates carbon capture, utilization, and storage with these two processes.