Czasopismo | PRZEMYSŁ SPOŻYWCZY | Rocznik 2017 - zeszyt 4

Drying Control Design - Case Study on the Near-Ambient Drying of Rapeseed

10.15199/65.2017.4.4

nr katalogowy: 105771
10.15199/65.2017.4.4

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.The producers of rapeseed oil require that the raw material retains a high quality throughout the whole season of storage and processing. Rapeseed is a very sensitive biomaterial because of its structure. Its quality depends mostly on the post-harvest processing conditions, especially the drying temperature and drying method. High drying temperature affects the acid and peroxide value, which are significant indicators of the quality of rapeseed. The application of high temperatures leads to oxidative changes lowering the quality of the obtained oil. The degradation of phytosterols in rapeseed dried in near-ambient temperature is on average two times lower in comparison to rapeseed dried with hot air in temperatures 60-100°C [3]. Thus, oil obtained from rapeseed that was dried using near-ambient method has higher quality than that obtained from rapeseed d[...]

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