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2 Zeszyty Naukowe. Elektryka / Politechnika Łódzka

2 2009

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Optimum control of fluidised bed dryer by electrical capacitance tomography. Part 1: Moisture measurement

Wang H. G., Senior P., Mann R., Yang W. Q.

Zeszyty Naukowe. Elektryka / Politechnika Łódzka

2009

z. 114

23-27

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 model has been developed based on the temperature and relative humidity (RH) of the outlet air phase. To improve the image quality and reduce the imaging error, the Landweber iteration method is applied.

Optimum control of fluidised bed dryer by electrical capacitance tomography. Part 2: Control strategy and results

Wang H. G., Senior P., Mann R., Yang W. Q.

Zeszyty Naukowe. Elektryka / Politechnika Łódzka

2009

z. 114

29-33

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 to adjust the air flow rate of the fluidised bed. To evaluate the drying process, the thermal efficiency is given and results are compared based on this parameter.