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Fluidised beds are commonly used in the pharmaceutical industry for batch processing of solid particles, e.g. granulating and drying solid materials and coating compressed tablets. Currently, pharmaceutical fluidised beds are operated by trial-and-error, because of the lack of online tools to monitor the internal behaviour, such as gas-solids distribution, and to measure the operation parameters,...
Co-combustion of sludge with coal could be an interesting option to dispose this solid waste in China. TG (thermogravimetric) experiments indicated that the co-combustion of paper sludge and coal showed the integrative profiles of each individuals, and the blends with sludge content less than 20%wt behaved approaching to coal, although showing some differences. In addition, the early volatiles liberation...
The paper presents the comparative study of drying peppercorns in a rectangular fluidized-bed and a rectangular fluidized-bed with wavy surfaces. This experimental work has been carried out in two different drying bed configurations: rectangular bed and rectangular bed with wavy surface (called “wavy surface bed”). The wavy surface bed is used to produce a stronger turbulence flow inside. For each...
A novel annular spouted bed with multiple gas nozzles, has been proposed for dryness, pyrolysis, and gasification of coal particulates. It consists of two homocentric upright cylinders with some annularly located spouting gas nozzles between inner and outer cylinders. A three-dimensional Eulerian multiphase model, with closure law according to the kinetic theory of granular flow, was used to simulate...
Fluidised beds are widely used in the pharmaceutical industry for granulation, drying and coating. The product quality strongly depends on the operation parameters and process conditions, e.g. inlet airflow rate, temperature and spraying flow rate. For granulation and drying processes, the flow conditions can change dramatically due to different moisture level, because of the change in physical characteristics...
Based on the ASPEN PLUS simulation platform, drying and fluidized bed incineration process of mechanically dewatered sludge with 70% moisture content was simulated. Compared with other calculation methods, this method could achieve sludge incineration simulation rapidly, and could further optimize the technology or adjust the stream parameter conveniently. The results obtained showed that: The heat...
A fluidized bed microwave drying system was proposed for paddy drying. It consisted of two applicators which each had four perpendicular slots. The applicator was excited by two magnetrons. The analysis of electric field intensity distribution when paddy orientation was taken into account revealed that suitable paddy density in the applicator volume is 40%. Then, an investigation on the cumulative...
In this paper, the modeling and control of the moisture content of the particles in a batch fluidized bed dryer are studied. First, a lumped mechanistic model is developed to describe the heat and mass transfer between solid, gas and bubble phases and experimental validation shows that the model can be used to predict the particle moisture content and temperature profiles during the drying process...
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