Abstract
The MSF/FBE process in which a fluidized bed heat exchanger is used represents an attractive process for water distillation. High heat transfer coefficients obtained at low fluid velocities allow for vertical long-tube condenser configuration with short stage heights. In an MSF/FBE vapour production takes place in the vapour space and causes a high interfacial heat transfer. Flash chamber volume is reduced with a factor 6 comparing with the conventional MSF. Fouling factor is drastically reduced by the mechanical abrasive action of the solid fluidized particles. Hence there is a more urgent need to know the wall-to-liquid heat transfer coefficient in fluidized beds. Correlations from literature are in some cases contradictory. Ruckenstein's correlation agreed best with indirect measuring of the coefficient. A test programme was started to investigate heat transfer and to measure values in a direct method test module. Data-aquisition is reported. Independent variables as particle size, porosity, particle density and tube diameter allow for application of a large variety in heat and mass transfer. This enables a optimum unit design based on thermo-economic considerations. Such an optimum design is only possible with the aid of a flexible computer program. Part of this paper is devoted to calculation procedures, while in the last part the test module for determination of the wall-to-liquid heat transfer is reflected.
Published Version
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