NDLI: Post-combustion calcium looping process with a highly stable sorbent activity by recarbonation

Content Provider	Royal Society of Chemistry (RSC)
Author	Arias, Borja Alonso, Mónica Grasa, Gemma S. Abanades, J. Carlos
Copyright Year	2012
Abstract	This paper presents a novel sorbent regeneration technique for post-combustion calcium looping CO2 capture systems. The advantage of this technique is that it can drastically reduce the consumption of limestone in the plant without affecting its efficiency and without the need for additional reagents. The method is based on the re-carbonation of carbonated particles circulating from the carbonator using pure CO2 obtained from the gas stream generated in the calciner. The aim is to maintain the CO2 carrying capacity of the sorbent close to optimum values for CaL post-combustion systems (around 0.2). This is achieved by placing a small regeneration reactor between the carbonator and the calciner. This reactor increases slightly the conversion of CaO to carbonate so that it exceeds the so-called maximum CO2 carrying capacity of the sorbent. This increase compensates for the loss of CO2 carrying capacity that the solids undergo in the next calcination–carbonation cycle. Two series of experiments carried out in a thermogravimetric analyzer over 100 cycles of carbonation–recarbonation–calcination show that the inclusion of this recarbonation step is responsible for an increase in the residual CO2 carrying capacity from 0.07 to 0.16. A conceptual design of the resulting capture system shows that a limestone make-up flow designed specifically for a CO2 capture system can approach zero, when the solid sorbents purged from the CaL system are re-used to desulfurize the flue gas in the existing power plant.
Starting Page	7353
Ending Page	7359
Page Count	7
File Format	HTM / HTML PDF
ISSN	17545692
Volume Number	5
Issue Number	6
Journal	Energy & Environmental Science
DOI	10.1039/c2ee03008j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Sorbent Calcium Nintendocore Limestone Calcination Flue gas
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Renewable Energy, Sustainability and the Environment Nuclear Energy and Engineering

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Post-combustion calcium looping process with a highly stable sorbent activity by recarbonation

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