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Simultaneous Carbonation and Sulfation of CaO in Oxy‐Fuel CFB Combustion
Author(s) -
Wang C.,
Jia L.,
Tan Y.
Publication year - 2011
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.201000570
Subject(s) - carbonation , oxy fuel , thermogravimetric analysis , fluidized bed combustion , sulfation , combustion , calcination , chemistry , fly ash , chemical engineering , waste management , materials science , catalysis , organic chemistry , biochemistry , engineering
For anthracites and petroleum cokes, the typical combustion temperature in a circulating fluidized bed (CFB) is > 900 °C. At CO 2 concentrations of 80–85 % (typical of oxy‐fuel CFBC conditions), limestone still calcines. When the ash which includes unreacted CaO cools to the calcination temperature, carbonation of fly ash deposited on cool surfaces may occur. At the same time, indirect and direct sulfation of limestone also will occur, possibly leading to more deposition. In this study, CaO was carbonated and sulfated simultaneously in a thermogravimetric analyzer (TGA) under conditions expected in an oxy‐fuel CFBC. It was found that temperature, and concentrations of CO 2 , SO 2 , and especially H 2 O are important factors in determining the carbonation/sulfation reactions of CaO.