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In this study, CWM
is combusted and combustion phenomena are investigated in
fluidized bed combustor which has 140mm I.D. and 2300mm
height. The bed material is sand of mean diameter 0.405mm
and fixed bed height is 200mm. CWM is injected either
over–or–in–bed through water-cooled injector by positive
displacement pump. The exhaust gas composition, the
elutriation rates, and the unburned carbon contents in
elutriated ash are measured. The combustion efficiencies are
also investigated according to the CWM injector locations,
excess air ratios, and air preheat temperatures. When CWM
injector is used, the combustion of CWM is preceded in
agglomeration condition regardless of the CWM injector
positions. The contents of unburned carbon and the
elutriation rates are lower for the case of over-bed
injection than for in-bed-injection. The combustion
efficiencies according to the excess air ratios show the
same tendency regardless of the positions of CWM injector
when the fluidizing velocities are low.
Keywords:
CWM, Fluidized Bed Combustion, Combustion, Efficiency
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