95/01687 Characteristics of the freeboard combustion in a fluidized-bed coal combustor. II. Mathematical modeling

Abstract

A mathematical model for the carbon combustion reaction in the freeboard of a fluidized bed combustor using domestic anthracite coal was developed by using the entrainment mechanism of unburned carbon particle and applying the related reaction kinetics. The extent of carbon combustion, gas composition and temperature distributions in the freeboard can be determined from the proposed model. It was also found that among the kinetic parameters, the surface reaction rate constant gives significant effects on the temperature and gas compositions in the freeboard, while the CO combustion reaction rate constant gives a dominant effect on CO composition in the freeboard.