An experimental study on CWM combustion in fluidized bed combustor

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-colled 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 proceeded 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. And 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.