Combustion of Waste Sludge by Oxygen with Carbon Dioxide at a Circulating Fluidized Bed = Combustion of Waste Sludge by Oxygen with Carbon Dioxide at a Circulating Fluidized Bed

다국어 초록 (Multilingual Abstract)

Pilot bed tests using circulating fluidized bed reactor (CFB) were conducted to apply oxy-fuel technology for sludge combustion as a carbon capture and storage (CCS) technology. In preliminary, the hydrodynamics of circulating fluidized bed reactor was observed in the cold-bed setup to simulate the 30KWth CFB oxy-fuel pilot test bed, in which the superficial velocity for fast fluidization was determined over than 2.5m/s. The minimum fluidization velocity (U_mf) was estimated as 0.104 m/s. In the pilot test, air and oxy-fuel thermal oxidation experiments for sludge were conducted with a flue-gas recirculation unit. In the pilot test, the temperature profile was uniformly depicted and the pressure gradient was depicted as a typical CFB trend at each point. The flue-gas temperature was relatively higher in the range from 21 to 25% which indicate that the heat transfer rate was relatively higher with this range. The carbon dioxide from waste sludge combustion was gradually increased when oxygen injection rate was decreased and was approached over than 80% with oxygen injection rate ranged from 21 to 25%.