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In this paper, a distributed parameter approach is used to model and control a batch fluidised bed dryer. Electric capacitance tomography (ECT) is used as a sensor to measure and control the distributed permittivity in the bed. First, a lumped model is developed to describe the heat and mass transfer between solid, gas and bubble phases in the bed. Then, based on this model, a distributed parameter...
This is the first part of a paper, presenting online moisture measurement of a fluidised bed drying process based on online moisture measurement by ECT. From the adjacent electrode pairs of ECT, the water content of the particles is estimated based on correlation between the moisture content and the permittivity value. To compare and validate the noisture measurement by ECT, a simple mathematical...
This paper presents closed-loop control of a fluidised bed drying process based on online moisture measurement by ECT. In this Part, the control strategy is discussed and some results from batch drying processes are given and compared with no feedback control. The fluidisation velocity is estimated by a semi-empirical function based on the measured water content and the information is sent to a controller...
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