Control problem for a vacuum technological complex

Abstract

Based on a comprehensive study of technological processes occurring in the vacuum block for an installation of the ELOU-AVT type, the features for the complex technological complex under consideration as a control object were analyzed. In this regard, a physically based mathematical formulation for the optimal control problem of the block under study has been developed, taking into account restrictive conditions on control and input parameters. Taking into account the compiled mathematical models for the quantitative and qualitative characteristics of the process under consideration and the algorithm for their gradient adaptation, to numerically solve the problem of optimizing the functioning for this block, the classical Lagrange method multipliers is used, which allows the transition from the problem of a conditional extremum to the problem of finding the unconditional extremum for the constructed Lagrange function. This method, as well as the proposed algorithm and control principles, were applied for the first time to the vacuum block of the primary oil refining installation of the ELOU-AVT type under study. In wide range conditions of changes in input disturbing factors in quantity and quality, as well as insufficient operational quality information on the selected petroleum products, the proposed method and principles of development algorithm for controlling the process under study allows for prompt preliminary local regulation modes correction and the selection of new optimal modes for adaptive control as a whole. This circumstance leads to an increase in the economic production efficiency and the achievement of the greatest stability in the quality for the resulting target products.