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A method of evaluating limestone reactivity with SO 2 under fluidized bed combustion conditions
Author(s) -
Mattisson Tobias,
Lyngfelt Anders
Publication year - 1998
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.5450760411
Subject(s) - reactivity (psychology) , fluidized bed , fluidized bed combustion , combustion , quartz , chemistry , exponential decay , particle (ecology) , particle size , exponential function , combustor , mineralogy , sulfur dioxide , reaction rate constant , thermodynamics , materials science , kinetics , metallurgy , physics , inorganic chemistry , mathematics , organic chemistry , geology , nuclear physics , alternative medicine , mathematical analysis , oceanography , pathology , quantum mechanics , medicine
The reactivity of limestone with sulphur dioxide has been evaluated during conditions similar to those existing in a fluidized bed combustor using a fixed‐bed quartz reactor. The reactivity of up to 11 particle sizes of 2 limestones were evaluated, and an exponential decay function was found to best describe the rate behaviour versus conversion of CaO to CaSO 4 . The two constants in the exponential decay approximation could both be expressed as functions of particle size. Subsequently, the limestone reactivity as a function of both size and conversion could be reasonably well described by a total of 4 to 6 constants. An analytical sulphur capture model for fluidized bed boilers (FBB) that incorporates this type of reactivity function is proposed.