scholarly journals Robust feedback control of continuously operated convective dryers for particulate materials

2018 ◽  
Author(s):  
Andreas Bück ◽  
Carsten Seidel ◽  
Christoph Neugebauer ◽  
Robert Dürr
Keyword(s):  
Feedback Control ◽  
Product Quality ◽  
Continuous Operation ◽  
Drying Kinetics ◽  
Convective Drying ◽  
Particulate Solids ◽  
Common Process ◽  
Control Concept ◽  
Process Disturbances ◽  
Kinetics Of

Convective drying is a common process for the treatment of particulate solids also operated in continuous mode. Continuous operation is characterised by operation in steady-state with constant product throughput and constant product quality. Due to external influences, i.e. seasonal or local variations in the properties of the initial wet material, deviations in the product quality can result, for example over- or under-drying, or on-set of unwanted reaction. In this contribution a new feedback control concept is developed that is robust with respect to variations and uncertainties in the drying kinetics of the material and can reject and attenuate process disturbances. Keywords: Process control; drying kinetics; robustness; fluidized bed; yeast. 

scholarly journals Mathematical modeling of pequi pulp drying and effective diffusivity determination

2017 ◽  
Vol 21 (7) ◽  
pp. 493-498 ◽  
Author(s):  
Elisabete P. de Sousa ◽  
Rossana M. F. de Figueirêdo ◽  
Josivanda P. Gomes ◽  
Alexandre J. de M. Queiroz ◽  
Deise S. de Castro ◽  
...  
Keyword(s):  
Experimental Data ◽  
Effective Diffusivity ◽  
Drying Kinetics ◽  
Convective Drying ◽  
Drying Time ◽  
Air Speed ◽  
Drying Curves ◽  
Increasing Temperature ◽  
Kinetics Of ◽  
Best Fit

ABSTRACT The aim of this work was to study the drying kinetics of pequi pulp by convective drying at different conditions of temperature (50, 60, 70 and 80 °C) and thickness (0.5, 1.0 and 1.5 cm) at the air speed of 1.0 m s-1, with no addition of adjuvant. The experimental data of pequi pulp drying kinetics were used to plot drying curves and fitted to the models: Midilli, Page, Henderson & Pabis and Newton. Effective diffusivity was calculated using the Fick’s diffusion model for a flat plate. It was found that, with increasing thickness, the drying time increased and, with increasing temperature, the drying time was reduced. The Midilli model showed the best fit to the experimental data of pequi pulp drying at all temperatures and thicknesses, presenting higher coefficients of determination (R2), indicating that this model satisfactorily represents the pequi pulp drying phenomenon. There was a trend of increase in the effective diffusivity with the increase in pulp layer thickness and temperature.

Convective Drying Kinetics of Polymer Strip Films Loaded with a BCS Class II Drug

2019 ◽  
Vol 20 (2) ◽  
Author(s):  
A. T. Naseri ◽  
E. Cetindag ◽  
J. Forte ◽  
E. Bilgili ◽  
Rajesh N. Davé
Keyword(s):  
Class Ii ◽  
Drying Kinetics ◽  
Convective Drying ◽  
Bcs Class Ii ◽  
Kinetics Of

Influence of Osmotic Pre-treatment on Convective Drying Kinetics of Figs

2013 ◽  
Vol 9 (2) ◽  
pp. 187-196 ◽  
Author(s):  
Juliana M. Silva ◽  
Muriel G. Cantu ◽  
Vera Rodrigues ◽  
Marcio A. Mazutti
Keyword(s):  
Experimental Data ◽  
Moisture Content ◽  
Osmotic Dehydration ◽  
Sucrose Concentration ◽  
Drying Kinetics ◽  
Soluble Solids ◽  
Convective Drying ◽  
Final Time ◽  
Osmotic Treatment ◽  
Kinetics Of

AbstractThis work evaluated the effects of osmotic dehydration on convective drying kinetics of figs. It used the experimental design methodology to evaluate the influence of sucrose concentration, temperature and time on the amount of total soluble solids (TSS) and moisture content of the figs. After the osmotic dehydration, it evaluated the convective drying kinetics at temperatures from 55 to 75°C. A mathematical model was employed to fit the experimental data. From the experimental data of the osmotic dehydration, it was seen that the moisture content of the figs after the treatment was closely related to the amount of TSS of the figs. Low moisture content and high TSS content were obtained for a narrow range of independent variables comprised between 55–60°C, 55–63 wt% and 260–280 min for temperature, sucrose concentration and exposure time, respectively. In the convective drying kinetics of the figs, there were no verified significant differences in the final time of drying of non-treated and osmotically dehydrated figs. However, the shrinkage was considerably reduced in the osmotically treated figs. The use of osmotic treatment enables the obtainment of figs softer than the simple use of convective drying without changing the final time of drying.

Convective Drying Kinetics of Fresh Beef: An Experimental and Modeling Approach

2015 ◽  
Vol 39 (6) ◽  
pp. 2581-2595 ◽  
Author(s):  
Tom Ahmat ◽  
Mahamat Barka ◽  
Aworou-Waste Aregba ◽  
Denis Bruneau
Keyword(s):  
Drying Kinetics ◽  
Convective Drying ◽  
Modeling Approach ◽  
Kinetics Of

Thin layer drying kinetics of cocoa and dried product quality

2009 ◽  
Vol 102 (2) ◽  
pp. 153-161 ◽  
Author(s):  
C.L. Hii ◽  
C.L. Law ◽  
M. Cloke ◽  
S. Suzannah
Keyword(s):  
Thin Layer ◽  
Product Quality ◽  
Drying Kinetics ◽  
Thin Layer Drying ◽  
Kinetics Of

Ultrasonic Convective Drying Kinetics of Clipfish During the Initial Drying Period

2013 ◽  
Vol 31 (11) ◽  
pp. 1307-1316 ◽  
Author(s):  
Michael Bantle ◽  
Joachim Hanssler
Keyword(s):  
Drying Kinetics ◽  
Convective Drying ◽  
Kinetics Of
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