HEAT TRANSFER IN SPRAYED SPOUTED BEDS

An experimental and theoretical study of the influence of various kind of beds, static bed height and ratio of mass flow of water to mass flow rate of gas on heat transfer coefficient was carried out. The results of the investigations were compared with literature correlations for predicting heat transfer in conical spouted beds. Moreover, a new correlation of dimensionless groups was developed for heat transfer during spraying spouted beds. Also, the model of Kmiec [Kmiec, Bed Expansion and Heat and Mass Transfer in Fluidized Beds, Sci. Pap. Inst. Chem. Eng. Heating Equip. Wroclaw Univ. Technol. 36, Monographs No. 19, Publishing House of Wroclaw University of Technology, Wroclaw, Poland, 1980a; Kmiec, Chem. Eng. J. 1980b;19,189-200] of particle circulation and heat transfer between spouting gas and particles was analyzed. The one-dimensional mathematical models for solids flow in a spout and for heat transfer in a spouted bed analyzed here lead to differential equations which, solved numerically, give results in good agreement with experimental data.