| Abstrakt: |
Improving the control quality of objects with distributed parameters, including the rectification process, could be achieved by using mobile actions. It is known that moving along the column height of the feed supply point or redistributing a given flow between the apparatus’ two contact devices allows getting the technical and economic indicators of stationary modes unattainable by using traditional control. Also, the transient responses in the column when using movable influences remained unstudied. The article developed a mathematical model of the distillation process dynamics, considering mobile control actions, as well as there have been studied the dynamic modes’ features of column operation when used them. The model allows implementing disturbances and control actions of various kinds and intensities via several channels simultaneously or at certain points of time. The model allows computing the processes of multicomponent and complex distillation, and can be used to compute the starting modes. Due to mobile actions, the distillation process leaves the dynamic equilibrium state. It was established that a new stationary mode is achieved by regulating the pressure at the column top, the levels of the bottom product and distillate. There are proposed the PID controllers with effects on the refrigerant flow rate into the condenser and separation products. The process dynamic model is supplemented by a description of these automatic control loops. By the developed model the computational experiments were carried out on the example of a column for separation of a methanol-water mixture. It is proved that transient responses are characterized by acceptable quality indicators when using mobile control actions on the distillation process. [ABSTRACT FROM AUTHOR] |
