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CO 2 Capture and Desulfurization in Chemical Looping Combustion of Coal with a CaSO 4 Oxygen Carrier
Author(s) -
Zhang S.,
Xiao R.,
Yang Y.,
Chen L.
Publication year - 2013
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201200653
Subject(s) - flue gas desulfurization , chemical looping combustion , coal , chemistry , oxygen , combustion , anhydrite , chemical engineering , limiting oxygen concentration , waste management , carbon fibers , energy value of coal , coal combustion products , analytical chemistry (journal) , materials science , chromatography , metallurgy , organic chemistry , gypsum , engineering , composite number , composite material
Chemical looping combustion (CLC) of coal along with desulfurization was investigated in a fixed‐bed reactor with anhydrite as oxygen carrier and CaO and CaCO 3 as desulfurizers, regarding the influence of temperature, pressure, mass ratio of coal to CaSO 4 , and Ca/S ratio. CO 2 concentration and fuel conversion increased with higher temperature and pressure but decreased with higher mass ratios of coal to CaSO 4 . Approximately 94 % outlet CO 2 concentration and 83 % carbon conversion could be achieved under optimum operating conditions. Desulfurization tests proved the higher desulfurization efficiencies of both CaO and CaCO 3 at elevated temperatures and pressures. CaO performed better than CaCO 3 , and an optimum value of Ca/S ratio existed for CaO. These findings demonstrate a good performance of anhydrite as oxygen carrier and the promising prospects of desulfurization in CLC of coal.