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Integration of a Ca looping system for CO 2 capture in existing power plants
Author(s) -
Martínez Isabel,
Murillo Ramón,
Grasa Gemma,
Carlos Abanades Juan
Publication year - 2011
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.12461
Subject(s) - sorbent , calcium looping , flue gas , supercritical fluid , process engineering , work (physics) , waste management , coal , gas compressor , integrated gasification combined cycle , combined cycle , power station , engineering , environmental science , electricity generation , power (physics) , chemistry , mechanical engineering , adsorption , thermodynamics , electrical engineering , gas turbines , physics , organic chemistry
This work analyses a Ca looping system that uses CaO as regenerable sorbent to capture CO 2 from the flue gases generated in power plants. The CO 2 is captured by CaO in a CFB carbonator while coal oxycombustion provides the energy required to regenerate the sorbent. Part of the energy introduced into the calciner can be transferred to a new supercritical steam cycle to generate additional power. Several case studies have been integrated with this steam cycle. Efficiency penalties, mainly associated with the energy consumption of the ASU, CO 2 compressor and auxiliaries, can be as low as 7.5% p. of net efficiency when working with low‐CaCO 3 make‐up flows and integrating the Ca looping with a cement plant that makes use of the spent sorbent. The penalties increase to 8.3% p. when this possibility is not available. Operation conditions aiming at minimum calciner size result in slightly higher‐efficiency penalties. © 2010 American Institute of Chemical Engineers AIChE J, 2011