Slag Formation during Oxygen-Blown Entrained-Flow Gasification of Stem Wood

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• 作者：Per Carlsson ; Charlie Ma ; Roger Molinder ; Fredrik Weiland ; Henrik Wiinikka ; Marcus 脰hman ; Olov 脰hrman
• 刊名：Energy & Fuels
• 出版年：2014
• 出版时间：November 20, 2014
• 年：2014
• 卷：28
• 期：11
• 页码：6941-6952
• 全文大小：705K
• ISSN：1520-5029

文摘

Stem wood powders were fired in a mullite-lined pilot-scale oxygen-blown pressurized entrained-flow gasifier. During repeated campaigns involving increases in fuel load and process temperature, slag formations that eventuated in the blockage of the gasifier outlet were observed. These slags were retrieved for visual and chemical characterization. It was found that the slags had very high contents of Al and, in particular, high Al/Si ratios that suggest likely dissolution of the mullite-based refractory of the gasifier lining due to interactions with the fuel ash. Possible causes for the slag formation and behavior are proposed, and practical implications for the design of future stem wood entrained-flow gasifiers are also discussed.