Distributed parameter control of a batch fluidised bed dryer

Villegas, J.A.; Duncan, Stephen R.; Wang, Haigang G.; Yang, Wuqiang; Raghavan, R. S.

doi:10.1016/j.conengprac.2009.04.012

Cited by 14 publications

(4 citation statements)

References 18 publications

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“…A traditional control approach has been used by many researchers to control fluidized bed dryers (Temple & van Boxtel,2000, Abdel-Jabbar, Jumah & Al-Haj Ali, 2005, Atthajariyakul & Leephakpreeda, 2006, Villegas et al 2009, Aghbashlo et al 2014, Vieira et al 2019Van Engeland et al 2019). Another model-based control approach has not been widely used by researchers in the field of dryer control until now (Robert et al 2019, Andreas et al 2018Lars et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Dynamic Modelling and Performance Optimization-Based Sliding Mode Control of Process Drying in a Convective Tunnel Dryer

Oueslati

Mabrouk

Mami³

2021

International Journal of System Dynamics Applications

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In this work, we thoroughly investigate the use of sliding mode control for nonlinear systems, specially its application for the control of dryer designed for drying food products. A dynamic model of the drying process has been developed, experimental measurements presented in this paper are established for different values of drying air temperature and drying air velocity. Two scenario of sliding mode control applied to the hybrid tunnel dryer has been assessed through simulations. At first, a nonlinear sliding mode control with first order sliding surface was tested. In front of the insufficient performance of this control in terms of the presence of chattering phenomenon and static error, it was decided to apply a nonlinear sliding mode control with PI sliding surface. Simulation results show that this latter control approach can obtain excellent control performance with no chattering problem, reducing of static error and a good tracking of trajectory.

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Section: Introductionmentioning

confidence: 99%

Dynamic Modelling and Performance Optimization-Based Sliding Mode Control of Process Drying in a Convective Tunnel Dryer

Oueslati

Mabrouk

Mami³

2021

International Journal of System Dynamics Applications

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“…Previous studies related to fluidised bed control were mainly devoted to fluidised bed dryers using model predictive control (Gagnon et al, 2017;Wang et al, 2009) and distributed parameter control (Villegas et al, 2009). Due to the complex gas-solids multiphase flows involved in a coating process, knowledge on pellet agglomeration and size growth is still limited without a robust and reliable predictive model of flow behaviour.…”

Section: Introductionmentioning

confidence: 99%

Control of pellets coating in a Wurster fluidised bed by means of electrical capacitance tomography

Che

Wang

et al. 2019

Transactions of the Institute of Measurement and Control

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Wurster fluidised bed is commonly used for coating pellets in the pharmaceutical industry. Normally, the control in a Wurster fluidised bed for coating is based on point-based measurement, that is, pressure and optical probes. However, the point-based measurement methods only provide local flow information and cannot reveal the cross-sectional flow dynamics characteristics and it is difficult to control the whole process with limited data. In this paper, electrical capacitance tomography (ECT) is applied to reconstruct the solids distribution in a lab-scale Wurster fluidised bed for coating pellets and the measurements are used in a control loop of the process. The flow regime is identified from the ECT images using a simple but efficient approach. The objective of control is to keep stable minimum fluidisation and avoid undesired flow regime in the region between the outside wall and the Wurster tube, such as intermittent, plug and defluidisation. To achieve this target, a PID controller is applied to keep a low volume fraction in the annular region by adjusting the fluidisation air rate, and bang-bang control is applied to a peristaltic pump used for spraying coating solutions based on the detected flow regime. It has been found that the proposed control scheme based on the ECT measurement is effective for keeping a stable flow regime, reducing the degree of pellets agglomeration and avoiding defluidisation.

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“…Meanwhile, heat has to be transferred from the drying medium to the inside of each particle. The drying course varies with particle temperature and heating rate, since drying is often accompanied by particle shrinkage and deformation [2,3].…”

Section: Introductionmentioning

confidence: 99%

Effect of Relative Humidity on Drying Kinetics of Agricultural Products

Sabudin

Remlee

Batcha

2014

AMM

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The demand for food has been ever increasing in proportion with the growing human population. This includes agricultural products including fruits. Hence, food preservation for extended usage through drying is gaining importance. This study reports the drying behavior of several agricultural products, namely sweet potato, carrot, ginger, turmeric, passion fruit and its rind. Focus has been given to the effect of relative humidity on drying for these products at room temperature. Experiments were carried out at 27°C by varying relative humidity at 40%, 60% and 80%. It was found that the relative humidity has a strong effect on drying, with lower relative humidity providing higher drying rates. In humid surrounding like Malaysia which has an average humidity more than 70%, controlling humidity of drying air may result in an energy efficient process in comparison to raising the drying air temperature

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Distributed parameter control of a batch fluidised bed dryer

Cited by 14 publications

References 18 publications

Dynamic Modelling and Performance Optimization-Based Sliding Mode Control of Process Drying in a Convective Tunnel Dryer

Dynamic Modelling and Performance Optimization-Based Sliding Mode Control of Process Drying in a Convective Tunnel Dryer

Control of pellets coating in a Wurster fluidised bed by means of electrical capacitance tomography

Effect of Relative Humidity on Drying Kinetics of Agricultural Products

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