Distillation process optimization using continuous mobile control actions by redistributing the feed flow
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Abstract
Object. Systems of the distillation processes automatic control, that provide extreme quality indicators of the column functioning using mobile control actions and a nonlinear predictive simulation. Subject. A method for optimizing the distillation process using continuous mobile control actions in the feed flow redistribution between the apparatus’ contact devices. Aim. The method development for computation of optimal control actions on the process of multicomponent distillation, including continuous mobile actions, that provide optimal operating modes for columns according to criteria for productivity maximization and energy costs minimization. Results. The static simulation allowed computing the concentration profiles of the column for the separation of the methyl tert-butyl ether synthesis products (MTBE) and it was proved that the feed flow redistribution between two contact devices can significantly affect the apparatus’ static characteristics, meanwhile the quality of the target product is extremely dependent on the redistribution coefficient. The choice of the feed tray is justified considering the criterial losses on the contact devices of the column. The problem of the multicomponent distillation process optimizing for a normalized criterion, which simultaneously includes the process productivity and the energy consumption for its conduct, is solved. The selected criterion extremely depends on the magnitude of the continuous control action, that determines the existence and uniqueness of the optimization problem solution. Conclusions. It is proved that the continuous mobile actions allow providing many modes of operation of the column, unattainable in the class of traditional and discrete, and to improve the technical and economic performance of the process compared with cases of full feed supply to any of the trays. The research’s results can be used in solving problems of designing and optimizing the operation modes of distillation apparatuses, for making automatic control systems for distillation processes.
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References
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