A Study of CO₂ Capture in Advanced IGCC Systems by Ammonia Scrubbing

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• 作者：Davide Bonalumi ; Antonio Giuffrida ; Giovanni Lozza
• 关键词：Air-blown ; IGCC ; CO2 capture ; Chilled ammonia ; SPECCA
• 刊名：Energy Procedia
• 出版年：2014
• 年：2014
• 卷：45
• 期：Complete
• 页码：663-670
• 全文大小：534 K

文摘

This paper deals with post-combustion CO₂ capture by aqueous ammonia in air-blown gasification-based combined cycles and follows previous authors鈥?investigations of CO₂ capture by MEA scrubbing. Based on the calculations, CO₂ capture seems to be more penalizing when realized by chilled ammonia instead of MEA. As a matter of fact, chilling down to 7 掳C both the exhaust gas and the ammonia solution results in significant power consumption of chillers, which is only partly balanced by the lower consumption for CO₂ compression and lower steam extraction from the bottoming cycle compared to the MEA case. Cases with cooled instead of chilled ammonia are investigated as well. In particular, raising the process temperature up to 20 掳C seems to be an interesting solution, since temperature control in the absorber can be realized by passing the aqueous ammonia solution through an heat exchanger, using ambient-temperature water as refrigerant medium and removing the chillers from the system.