RESEARCH OF TRANSIENT RESPONSES IN AUTOMATIC MOBILE CONTROL SYSTEMS OF DISTILLATION PROCESS

Anton Sheikus

Abstract


Improving the control performance of objects with distributed parameters, which include the distillation process, is achievable by using mobile actions. It is known that moving along the column height of the feed point or redistributing a given flow between two contact devices of the apparatus makes it possible to achieve techno-economic indicators of stationary modes unattainable by traditional control. At the same time, transient responses in the column when using mobile actions remained unexplored.

To solve this problem, a mathematical model of the dynamics of the distillation process has been developed, taking into account the mobile control actions, and the features of the dynamic modes of operation of the column when using them have been investigated. The model provides for the possibility of implementing disturbances and control actions of various shapes and intensities through several channels simultaneously or at certain points in time.

It is established that a new stationary mode is achieved by regulating the pressure at the top of the column, the levels in the tanks to collect the bottom fractions and distillate. The use of PID controllers with actions on the refrigerant flow rate into the condenser and separation products is proposed. The dynamic process model is supplemented by a description of these automatic control loops.

Using the developed model, computational experiments are carried out on the example of a column for the separation of a methanol-water mixture. It is proved that transient responses when using mobile control actions on the distillation process are characterized by acceptable quality indicators.

The research results are applicable in the construction of systems for automatic mobile control of distillation processes, adaptive, optimal control systems using predictive models.


Keywords


distillation; column; mobile control; dynamic simulation; transient response; feed tray

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References


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DOI: http://dx.doi.org/10.21303/2585-6847.2019.001043

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ISSN 2585-6847 (Online), ISSN 2585-6839 (Print)