2024-03-29T11:08:38Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/845682020-04-29T09:40:29Zcom_10261_35com_10261_5col_10261_288
00925njm 22002777a 4500
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Gayán Sanz, Pilar
author
Abad Secades, Alberto
author
Diego Poza, Luis F. de
author
García Labiano, Francisco
author
Adánez Elorza, Juan
author
2013-08-12
The chemical looping combustion of solid fuels by in situ gasification (iG-CLC) has great potential to reduce the economical and energetic cost of CO2
capture for generating energy from coal. Previous studies have highlighted that a high CO2 capture rate can be reached, but incomplete combustion is predicted
by theoretical models or obtained during experimental work. In this paper, a mathematical model for the fuel reactor and carbon stripper, validated through experimental results, is adapted to evaluate the relevance of several technological improvements in order to increase the combustion efficiency of the iG-CLC process. The technological options evaluated include increasing the gas–solid contact in the fuel reactor, incorporating a secondary fuel reactor, re-circulating exhaust gases to the fuel reactor or the carbon
stripper, or feeding coal into the carbon stripper instead in the fuel reactor. Model simulations showed that the use of a secondary fuel reactor has the major impact by reducing the unburnt compounds in
the CO2 stream. The origin of the unburnt compounds is determined from a thorough analysis of the results obtained during the evaluation of these technological options. Thus, a new arrangement of the iG-CLC reactors is proposed, one which would minimise the presence of unburnt compounds. In this concept, exhaust gases from the fuel reactor are sent to the carbon stripper. The oxygen demand for this concept is predicted to be XT= 0.9%.
Chemical Engineering Journal 233: 56-69 (2013)
1385-8947
http://hdl.handle.net/10261/84568
CO2 capture
Chemical looping combustion
Coal
Simulation
Optimisation
Assessment of technological solutions for improving chemical looping combustion of solid fuels with CO2 capture