Dp 347 en
Modelling and Control Tunnel Pasteurizers
Author: Jonáš Pavel
Pasteurization is a temperature treatment of food whereby microbiological organisms are destroyed. The main goals of pasteurization are to make the product safe for human consumption and to promote biological stability of the food and thereby improve its shelf life. One of means how to achieve pasteurization of the product is tunnel pasteurizers. They are integral part of production lines of many breweries and other producers of beverages all over the world. Tunnel pasteurizers consist of a long enclosed chamber typically 15 – 30 m long, in which water is sprayed onto the packages (typically bottles and cans) which are moved through by a conveyor. The quality of control of pasteurizers has cardinal impact on flavour and biological safety of the product and not least on the economy of the plant operation. The goal of this thesis is to design a simulation model of a tunnel pasteurizer and a suitable control algorithm.
First, it is necessary to get acquainted with pasteurization process and pasteurizers. In the next step, the simulation model of tunnel pasteurizer is developed. Linearized model is used as a basis for design of predictive control algorithm, formulated using mixed integer programming. The controller is then tested using model situations of tunnel pasteurizer operation.