Details

Autor(en) / Beteiligte

• Zhen-shan, Li
• Ning-sheng, Cai
• Croiset, Eric

Titel

Process analysis of CO₂ capture from flue gas using carbonation/calcination cycles

Ist Teil von

• AIChE journal, 2008-07, Vol.54 (7), p.1912-1925

Ort / Verlag

Hoboken: Wiley Subscription Services, Inc., A Wiley Company

Erscheinungsjahr

2008

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Process analysis of CO₂ capture from flue gas using Ca-based carbonation/calcination cycles is presented here. A carbonation/calcination system is composed essentially of two reactors (an absorber and a regenerator) with Ca-based sorbent circulating between the two reactors (assumed here as fluidized beds). CO₂ is, therefore, transferred from the absorber to the regenerator. Because of the endothermicity of the calcination reaction, a certain amount of coal is burned with pure oxygen in the regenerator. Detailed mass balance, heat balance and cost of electricity and CO₂ mitigation for the carbonation/calcination cycles with three Ca-based sorbents in dual fluidized beds were calculated and analyzed to study the effect of the Ca-based sorbent activity decay on CO₂ capture from flue gas. The three sorbents considered were: limestone, dolomite and CaO/Ca₁₂Al₁₄O₃₃ (75/25 wt %) sorbent. All results, including the amount of coal and oxygen required, are presented with respect to the difference in calcium oxide conversion between the absorber and the regenerator, which is an important design parameter. Finally, costs of electricity and CO₂ mitigation costs using carbonation/calcination cycles for the three sorbents were estimated. The results indicate that the economics of the carbonation/calcination process compare favorably with competing technologies for capturing CO₂. © 2008 American Institute of Chemical Engineers AIChE J, 2008