Reduction of energy consumption in batch fluidized bed layering granulation processes by temporal separation

Abstract Nowadays demands for product quality and energy efficiency are increasing due to ongoing industrial development and rising costs of resources. In case of fluidized bed layering granulation profitability mainly depends on the total energy input required for fluidization, evaporation of the sprayed liquid and drying, in balance with product quality and process efficiency. This paper is focuses on temporal separation of process steps like growth and liquid evaporation as one way of intensification of batch processing. In order to optimize both sub-processes, granulation and particle drying, are operated alternating by switching the spraying rate and other process parameters. In order to obtain the required data, experimental and model based investigations for different parameter configurations are performed. The analysis of results is carried out in comparison to a benchmark case, for batch operation this comparison is based either on equal process time or product quality. The results show significant advantages of temporal separation in batch processes with respect to energy consumption while conserving product quality.

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