An Automated System for Control of Refrigerant Parameters in a Fractionating Plant
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AN AUTOMATED SYSTEM FOR CONTROL OF REFRIGERANT PARAMETERS IN A FRACTIONATING PLANT M. M. Aksenova, V. L. Bondarenko, and M. Y. Kupriyanov
UDC 621.593
Introduction of automatic control systems for technological processes is an urgent task. For maintaining the fractionating plant refrigerant parameters, an automated monitoring and control system based on Russia-made programmable logic controllers (PLC) using a software developed in the freely available CoDeSys environment is proposed. The probability of use of shutoff-control valves with an electric drive and a stepper motor for controlling refrigerant flow rate and maintaining pressure in the fractionating column condenser is examined. Application of the control system enables reduction of refrigerant consumption in the fractionating plant operation process and maintenance of the key process parameters, which facilitates production of high-purity gases. Keywords: shutoff-control valve, programmable logic controller (PLC), CoDeSys, proportional-integral-differential (PID) controller, stepper motor.
Active development of works on automation of technological processes began in the 50–60’s of the 20th century [1]. Numerous gas separation process control systems applicable in the industry are very diverse because of the plurality of control parameters, their interrelations and the complexity of properties of the objects being controlled [2–4]. To simplify, the entire technological process is divided into segments characterized by a small number of variables. These segments coincide with the technological stages, for which their control subproblems subordinated to the general problem of process control (minimization of cost and energy consumption, improvement of products quality, etc.) are formulated. The degree of automation of production process control could be partial, medial, or full. Let us consider partial automation of a refrigerant supply unit of a research laboratory fractionating plant column for separating krypton-xenon mixture. The primary goal of the research was development of a system for maintenance and control of pressure in the refrigerant container and in the fractionating column condenser for getting high-purity gas and subsequent display of the process using SCADA system in the laboratory plant. For such purposes, industrial controllers are used in modern control systems [6]. Application of proportional-integral-differential (PID) controller enables enhancement of rapidity of response and accuracy of the control system under conditions of optimum adjustment of the controller parameters [7]. A Russia-made programmable logic controller (PLC) was used to pick up signals from the transducers and process them by the applied program of the user [8] with delivery of the control signals to the executing devices Refrigerant Pressure Maintenance System A schematic diagram of the refrigerant supply unit of the fractionating column for krypton-xenon mixture separation with conventional designations of the instruments and automation devices is shown in Fig. 1. N
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