Thermodynamic Assessment of Cooled and Chilled Ammonia-based CO₂ Capture in Air-Blown IGCC Plants

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• 作者：Davide Bonalumi ; ^{davide.bonalumi@polimi.it" class="auth_mail" title="E-mail the corresponding author} ; Alessio Ciavatta ; Antonio Giuffrida
• 关键词：Air-Blown IGCC ; Chilled ammonia ; Cooled ammonia ; Carbon capture ; SPECCA
• 刊名：Energy Procedia
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：86
• 期：Complete
• 页码：272-281
• 全文大小：356 K

文摘

The energy impact of different post-combustion CO₂ capture plants integrated in an advanced air-blown IGCC is simulated in this paper. Ammonia scrubbing is considered as the CO₂ capture technology and chilled and cooled modes are investigated with reference to operation temperatures at the absorber equal to 7 °C and 20 °C respectively. Ammonia slip is controlled by means of an absorption-desorption cycle just before a final acid wash, where use of the H₂S removed from the coal-derived gas at the desulphurization unit of the IGCC is made.

Focusing on three levels of CO₂ capture, from 80% to 90%, it is possible to appreciate that the cooled mode is promising as far as a reduction of the energy cost related to CO₂ capture is concerned. As a matter of fact, the energy saving, possible when adopting an air cooling system instead of a chilling plant, is significant with the specific primary energy consumption for 90% of CO₂ avoided which decreases from 2.79 MJ/kg_CO2 to 2.54 MJ/kg_CO2, when switching from the chilled to the cooled mode, with a difference equal to about 0.7 percentage point in IGCC efficiency.