Working out mathematical models of different juice evaporation schemes for automated process control systems

Abstract

The problems of low efficiency of sugar mills in Ukraine are identified. The focus was made on the impact of the evaporation stage as a main branch of a sugar mill, which provides steam for production of an entire mill, on the energy efficiency. The study determined the influence of technological and technical parameters of an evaporator on the work of an entire sugar mill. The energy efficiency of the evaporation process in the different types of evaporators is considered and promising approaches are determined to solve the problem of energy consumption.The typical structural and technological features of the equipment for evaporators which are used in different schemes of the juice evaporation are given. It was determined there are both the technological indicators of the juice evaporation (temperature, pressure, juice and steam consumption, juice level in evaporators), and quality indicators that characterize the juice and the syrup (solids, alkalinity, good quality, turbidity, colour, etc). The analysis of the influence of qualitative indicators of the technological evaporation process on quality of the products is made. The ways of solving the problems are determined which can occur when the product quality decreases and the efficiency of sugar production falls, if the properties of the processed raw materials are not taken into account during the whole technological process.The problems in the operation of evaporation automated process control systems are considered. Due to the complexity of the juice evaporation in an evaporator and the influence of both various technological and qualitative process indicators, we identified the main management vectors in the automated process control systems of evaporation. To solve this problem we offer an approach to the effective use and elaboration of simple regression mathematical models that can be applied in the mathematical support of the specific control process systems. Mathematical models of the evaporator operation were worked out, where both technological and qualitative indicators of the products are taken into account, and which are used in the automated process control systems of a sugar mill. The efficiency of the proposed models for operation in the automated process control systems of the evaporation process is substantiated. So there is reason to argue that the resulting regression model which takes into account the quality indicators of the juice can be used in the first approximation in the automated process control system of a sugar mill.