INVESTIGATIONS OF THE BUBBLE PHASE BEHAVIOR IN A HIGH TEMPERATURE FLUIDIZED BED REACTOR WITH COALCOMBUSTION
WELUDA, K.D.; SCHÜTTE, K.; WITTLER, W.; WINGELSDORF, R.; SCHÜGERL, K.; WELUDA, K.D.; Institut für Technische Chemie, Universitat Hannover; SCHÜTTE, K.; Institut für Technische Chemie, Universitat Hannover; WITTLER, W.; Institut für Technische Chemie, Universitat Hannover; WINGELSDORF, R.; Institut für Technische Chemie, Universitat Hannover; SCHÜGERL, K.; Institut für Technische Chemie, Universitat Hannover
Журнал:
Chemical Engineering Communications
Дата:
1987
Аннотация:
The properties of bubbles in a bench-scale fluidized bed reactor, 30 cm in diameter, during coal combustion were determined by means of a newly developed cooled bubble probe and a data processing system at temperatures up to 850°C and fluidization indexes up to 10 in axial and radial positions in the bed. The fluidization index above 4 and the temperature have only slight effect on the bubble properties. Their variation along the height above the gas distributor is dominant.Oxygen and Co<sub>2</sub>-concentration profiles were measured in the bed and in the freeboard, and the o<sub>2</sub>-profiles were calculated by means of measured bubble data and bubble models. A comparison of measured and calculated o<sub>2</sub>-profiles indicates that the mass transfer rates between the emulsion and bubble phases are larger than the ones calculated by the models.
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