Ways to improve the efficiency of regulation of biomass concentration using modern control systems

Abstract

Abstract The paper presents an option for solving the task of controlling the process of growing yeast in order to bring their concentration X closer to the desired one by deliberately changing the parameters of the process conditions within acceptable limits. The relationships between the main parameters of the process of cultivation of microorganisms are revealed. It is shown that these relationships are of a complex cross character, and the control object is multidimensional. Based on the analysis of the interaction of the main parameters, a diagram of their relationship is drawn up. At optimal values of the parameters of the process conditions, the change in yeast concentration is far from the required. It is proposed to change the parameters of the process conditions in accordance with a given value of the concentration of yeast Xgiv, which can be determined with constant periodicity during the cultivation process. To solve assigned task, the principle of cascade control of yeast concentration X is used, where the internal contour includes the systems of controlling the temperature, acidity, formal value, and respiratory coefficient. The analysis of transients in cascade systems showed that the most effective systemsunder consideration are concentration control systems that use the temperature and the acidity of the medium control in the internal circuits.