Dubik R. Modeling and robust control process of contact membrane distillation

The dissertation is devoted to questions of increasing the efficiency of management of the installation of contact membrane distillation, by improving process control in the functional uncertainties of the membrane. As a result of the analysis, it has been established that uncertainties such as total thermal resistance and porosity are characteristic for the process of contact membrane distillation, which significantly affect the process control. The mathematical model of the process is developed which takes into account the spatial distribution of velocities and temperatures along the channels of the membrane module and in the membrane pores, as well as a model for control purposes that takes into account the uncertainties of the process parameters. The task of robust process control is set and solved. There are developed variants of automatic control systems of the contact membrane distillation process, the main difference of which, is in the method of measuring the temperature difference, which influence on capacity of the membrane. There is developed process control system on robust regulator basis, which provides control of the process under conditions of uncertainty, and allows, if necessary, to stop the installation of membrane cleaning or replacing. Developed software module "Modelling and optimal control of the process of contact membrane distillation" was implemented at PJSC "ROSICH" in the system of automatic control of the lighted apple juice concentration. The educational process of the Department of Automation of Chemical Productions at the National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute" implemented mathematical models of the contact membrane distillation process, the optimal and robust control system of the contact membrane distillation process.