Efficiency enhancement in IGCC power plants with air-blown gasification and hot gas clean-up

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• 作者：Antonio Giuffrida ; ^{antonio.giuffrida@polimi.it} ; Matteo C. Romano ; Giovanni Lozza
• 关键词：IGCC ; Air-blown ; Gasification ; Hot gas clean-up ; Desulfurization ; Zinc-based sorbent
• 刊名：Energy
• 出版年：2013
• 出版时间：1 May, 2013
• 年：2013
• 卷：53
• 期：Complete
• 页码：221-229
• 全文大小：615 K

文摘

Air-blown IGCC systems with hot fuel gas clean-up are investigated. In detail, the gas clean-up station consists of two reactors: in the first, the raw syngas exiting the gasifier and passed through high-temperature syngas coolers is desulfurized by means of a zinc oxide-based sorbent, whereas in the second the sulfided sorbent is duly regenerated. The hot fuel gas clean-up station releases H₂S-free syngas, which is ready to fuel the combustion turbine after hot gas filtration, and a SO₂-laden stream, which is successively treated in a wet scrubber.

A thermodynamic analysis of two air-blown IGCC systems, the first with cold fuel gas clean-up and the second with hot fuel gas clean-up, both with a state-of-the-art combustion turbine as topping cycle, shows that it is possible to obtain a really attractive net efficiency (more than 51 % ) for the second system, with significant improvements in comparison with the first system. Nevertheless, higher efficiency is accomplished with a small reduction in the power output and no sensible efficiency improvements seem to be appreciated when the desulfurization temperature increases. Other IGCC systems, with an advanced 1500 ¡ãC-class combustion turbine as the result of technology improvements, are investigated as well, with efficiency as high as 53 % .