Design method of automatic control system for vapour-liquid consecutive reaction rectifying process

Abstract

The invention discloses a design method of an automatic control system for the vapour-liquid consecutive reaction rectifying process. The design method comprises the following steps of: (1) determining an optimal steady-state technological parameter of a vapour-liquid consecutive reaction rectifying tower; (2) determining a control target designed by the control system; (3) reasonably selecting a manipulated variable and an operating variable; (4), determining the position of the temperature of a sensitive plate; (5) designing a multi-loop automatic control system for the reaction rectifying process; and (6) adjusting and setting a controller structure parameter of the multi-loop automatic control system. The design method of the automatic control system for the vapour-liquid consecutive reaction rectifying process, provided by the invention, can effectively avoid the problems that the dynamic maladjustment of reaction and separating capacity in the tower can be easily caused by reaction mass properties and external disturbance, so that the product quality is reduced and the energy consumption is increased, and by using the method, a long-term stability operation of a closed-loop system of a vapour-liquid consecutive reaction rectification integration device is realized.

Description

technical field [0001] The invention relates to an interdisciplinary subject of chemical engineering and control engineering, belongs to the field of automatic control of production processes of chemical reactors and rectification towers, and relates to a design method of an automatic control system for a vapor-liquid series reaction rectification process. Background technique [0002] Reaction and distillation integration technology is an enhanced process that integrates chemical reaction and distillation separation process in the same equipment. Compared with the traditional production process, the reactive distillation integration technology effectively improves the conversion rate of raw materials or the selectivity of target products by removing the reaction products out of the tower in time, and has obvious advantages in the rational use of reaction heat, the improvement of equipment integration, and the saving of equipment investment. Advantage. In the industrial rea...

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Problems solved by technology

[0006] Since the reaction and separation processes occur in one device at the same time, not only the system exhibits strong nonlinearity, coupling and multi-stable characteristics, but also the control system design of the reactive distillation process is less complex than the traditional production process. The control degree of freedom and more complex dynamic characteristics make the design difficulty of the control system of the reactive distillation process and the control accuracy requirements significantly increased. Therefore, the common control methods of the rectification tower cannot be directly applied to the integrated process. It needs to be based on the characteristics of the reactive distillation process. Redesign an effective automatic control system to reduce the strong nonlinearity and coupling of the closed-loop system within a limited operating area to obtain ideal closed-loop control effects

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