DEVELOPMENT OF AN AUTOMATED SYSTEM FOR CONTROLLING THE TECHNOLOGICAL PROCESS OF ETHYLENE PRODUCTION

Abstract

In this work, a design solution was created and hierarchical control of an ethylene reactor with a control structure at two levels of automation was implemented. An automated control system for the technological process of ethylene pyrolysis has been developed, a control program that includes mathematical modeling of the furnace start-up process with excellent technological parameters, and the implementation of the control algorithm. It is complex and cracking reactions are not always fully controlled, so a new control scheme for this process is recommended and an automated control system for the ethylene production process is tested. The analysis and improvement of the pyrolysis process was carried out. A hierarchical control solution for an ethylene reactor with a control structure at two levels of automation was designed and implemented. The Matlab Simulink simulation environment was used, which helped to verify the efficiency protected by these control algorithms. The simulation results are obtained for the case when the amplitude of the reference signal for the steam regulation circuit is one third of the amplitude of the reference signal for the gasoline control circuit. The main processes during the pyrolysis of ethylene are considered. This ensured high-quality control of the pyrolysis process with a higher yield of ethylene. Judging by the tracking, it can be seen that the controller provides rejection of step-type disturbance signals applied to the system output. An appropriate numerical representation of control algorithm data is obtained in order to be able to implement them on a physical processing device. The Poles Placement Method was used to find out the controller parameters that could provide the required tracking and regulation properties for closed-loop systems. Comparing the RST control algorithm with the classic PID control algorithm, we settled on the first one because it allows us to impose different tracking and regulation characteristics, and it can also lead to a reliable control algorithm, which, taking into account the working context, is very important.