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Drying control desing - case study on the near-ambient drying of rapeseed

100%
Ryniecki A., Wawrzyniak J., Gawalek J., Horla D.
Przemysł Spożywczy
|
2017
|
tom 71
|
nr 04
Rapeseed oil producers should be interested in the near-ambient method of drying because the quality of rapeseed dried using this method is higher than that dried using high temperature methods. The design of a generalized control strategy for drying seeds in bulk in the climate that is a mixture of maritime and continental climates (such as in Poland and many other European countries) in the form of the block diagram is shown in this article. Such a block diagram can serve as an interface between food processing engineers and control engineers enabling further implementation of the above mentioned control strategy in industry. It combines a model-based prediction units, two-position-like control actions and drying process to be controlled with slow dynamics and strong averaging properties. In this article some benefits of the application of a generalized control strategy for near-ambient drying of seed have been given (based on literature reviews) - mainly significant reduction of drying costs in comparison to other control strategies used for this method of drying.
2

Bioprocess feedback controla case study of the fed-batch biomass cultivation bioprocess

88%
Ryniecki A., Wawrzyniak J., Gulewicz P., Horla D., Nowak D.
Przemysł Spożywczy
|
2018
|
tom 72
|
nr 08
It is particularly difficult to control a biotechnological process because of significant sensitivity of living organisms cultured in bioreactors to process parameters and environmental conditions. Varying conditions of the process are also significant (a change in the chemical composition of the substrate or a change in the mass exchange conditions resulting from the modification of rheological parameters). The industrial biomass cultivation processes require the optimal biomass growth rate. In order to ensure it, it is necessary to analyze input variables, find the most representative output variables, and design an adequate automated control strategy, which should be tailored to a given bioprocess. The article analyzes selected automated control systems in fed-batch biomass cultivation bioprocesses presented in reference publications concerning bioprocess control. Open-loop and closed-loop control systems were taken Into consideration. The research showed that open-loop control systems could not respond to process disturbances such as unexpected variations in input variables. Therefore, the authors analyzed closed-loop control systems in more detail, especially the feedback control systems with proportional-integral (PI) control action, which were used to stabilize the specific growth rate at a desired level. The authors presented equations which enable the online estimation of the specific growth rate on the basis of cellular metabolic heat. It has been noticed that the quality of automated control of bioprocesses can be further improved through improvement of control systems with a feedback.
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