Leontiev P. Automated control system for the installation of complex gas preparation for transportation

The thesis is dedicated to the solution of the scientific and practical issue of increasing the efficiency of the moisture separation process from compressed gas stream by reducing the time and fluctuations of transient processes under the conditions of transient disturbance parameters of the gas stream.The presence of delays in the reaction time of the object to the control effects of the regulator leads to the use of subordinate and adaptive control of the cooling and moisture separation processes that accompany the preparation of gas for treatment. A two-tier structure has been chosen to build the control system, which provides communication between the peripheral equipment and the workplace of the unit operator. On the basis of the developed models of gas treatment preparation processes, the identification of parameters of moisture separation experimental unit from the air flow has been carried out and the methods of synthesis of regulators of gas treatment preparation process have been worked out. The use of object modelling automation tools in MATLAB environment has made it possible to obtain a multipoint linearized object model. According to the control criterion, which is formulated as "maximization of dried gas consumption with minimal deviation from the dew point temperature", a twocircuit regulator of the moisture separation process is built. The inner circuit is created using an adaptive pressure regulator according to the tabular control method. The settings of the adaptive regulator are adjusted depending on changes in the parameters of the gas flow entering the throttling. The outer circuit is created by introducing extreme control by the step method, which maximizes the stream of dried gas and the stability of the parameters during the control process. The electric position of the latch, which determines the cross-sectional area of the throttle, i.e. the throttling mode, is built on the basis of a stepper motor. As a result of structural-parametric synthesis of unit regulators, relay regulators of processes of additional stream cooling and phase equilibrium maintenance by regulation of condensate level have been implemented.