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Fluidized combustion of char and volatiles from coal
Author(s) -
Turnbull Eion,
Davidson J. F.
Publication year - 1984
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690300602
Subject(s) - char , combustion , inert , chemical looping combustion , coal , fluidized bed combustion , chemical engineering , chemistry , fluidized bed , particle (ecology) , oxygen , mixing (physics) , diffusion , coal combustion products , porosity , waste management , thermodynamics , organic chemistry , geology , engineering , oceanography , physics , quantum mechanics
This paper reviews the literature about fluidized combustion of char and volatiles from coal. While the rate of combustion of particles bigger than about 2 mm is mainly limited by the rate of diffusion of oxygen, there is usually an effect of chemical rate. As particle diameter decreases, the influence of chemical rate increases. Char particles are porous and combustion occurs in pores near their exterior. Char reactivity can be modelled by an effective pore area for combustion. At high bed temperatures (>1,150 K), the rate of combustion of volatiles is limited by the rate of mixing of fuel and oxygen. At low bed temperatures (<1,000 K), combustion reactions are inhibited by the inert particles in the bed.