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Strength development due to long term sulfation and carbonation/sulfation phenomena
Author(s) -
Anthony Edward J.,
Jia Lufei,
Laursen Karin
Publication year - 2001
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450790308
Subject(s) - sulfation , carbonation , calcination , sulfur , pellet , sulfur dioxide , chemical engineering , materials science , chemistry , sulfate , mineralogy , metallurgy , composite material , inorganic chemistry , catalysis , organic chemistry , engineering , biochemistry
CFBC boilers firing high sulfur, low ash fuels can produce deposits consisting of almost pure CaSO 4 . Test work has shown that if sorbents or bed materials are sulfated for long times (several days or more), they develop compositions similar to those deposits. Sulfation increases with temperature from 650°;C to 900°C, and strength increases continuously in the temperature range of 650°C to 950°C. When sulfation occurs under conditions where CaCO 3 is stable, the overall strength of the deposit increases but the degree of sulfation diminishes. Finally, this work suggests that pellet tests using crushed and calcined sorbents can give misleading information and should be used with caution to study the phenomena described here.