FLAMMABILITY AND TEMPERATURE DISTRIBUTIONS IN A CIRCULATING FLUIDIZED-BED GAS COMBUSTOR

The application of a circulating fluidized bed (CFB) as a gas burner i s presented and discussed. The main area of this study is concerned wi th hydrodynamics, flame stability and temperature distributions of a C FB burner equipped with an internal nozzle burner in the bottom of the riser. Several kinds of solids are tested by changing such operationa l and design parameters as the ratio of air and fuel flow from the int ernal nozzle burner to the total flow, the solid circulation rate and the pre-heating temperature of solid particles. The hydrodynamics and flammable region are made clear and the circulation of particles has a significant effect on the bed temperature and temperature gradient in the combustion chamber.