Reaction kettle multi-mode joint control method and system

Abstract

The invention provides a reaction kettle multi-mode joint control method and system, and the system comprises a reaction kettle which is used for the technological production of a product; and a control center which is used for displaying various parameters in the reaction kettle and setting temperature and pressure parameters in the reaction kettle; wherein the reaction kettle comprises a temperature control module, a pressure module, a liquid material feeding module, a material transferring module, a solid material feeding module, a dropwise adding module, a sampling module, a stirring module, a cooling module and a PID controller; the temperature control module predicts the temperature in the reaction kettle at the next moment; the pressure module predicts the pressure in the reaction kettle at the next moment; and the PID controller controls the flow of a cooling liquid in the cooling module based on the results of the temperature prediction unit and the pressure prediction unit. The system can well adapt to a specific chemical process flow, the actual production cost is greatly reduced, the overall disturbance inhibition effect is obvious, and the realization of a main controltarget can be preferentially met.

Description

technical field [0001] The invention relates to process optimization and control of a production line in the field of chemical industry, in particular to a joint control system and method related to a chemical production line applied to multi-mode control of a reactor. Background technique [0002] The reactor is an important equipment commonly used in the chemical process production line. Through the structural design, control design and parameter configuration of the reactor, the process requirements of the process requirements are realized. The reactor is a chemical reactor with strong nonlinearity. It is the core equipment in the chemical production process. The quality of the control performance directly affects the production efficiency and product quality. The reactor is a highly comprehensive reaction vessel, which includes the monitoring and adjustment of important parameters such as temperature, pressure, mechanics, control of reactants and outputs. In the curren...

AI Technical Summary

Problems solved by technology

In the current market, most manufacturers and scientific research institutions are devoted to the research of reactor control methods related to CSTR control, but because their research focuses on the parameter adjustment of the control system itself, the design of the control system is becoming more and more complicated. Although the control method that only considers the control target ensures the product quality, it ignores the economic benefits and is not good for the factory production in the long run. Therefore, there is still no unified control theory for it.

[0003] In addition, in the existing technology, for example, the temperature and pressure in the reactor are jointly controlled at the same time. In order to reduce the complexity of the control and save costs, many manufacturers use negative pressure extraction in the pressure control of the reactor. Through the additional water circulation system installed, the temperature in the reactor is controlled, so as to achieve a certain pressure control target at the same time. When many factories adopt this method, they still rely on the operator to manually and slowly adjust the mechanical valve to complete the reaction within a certain period of time. This method not only increases the complexity of the operator's operation, but also has too low accuracy to meet the production requirements of high-demand chemical processes.

The conventional PID control is to carry out PID control on the frequency converter in the motor by collecting negative pressure signals. However, this conventional PID control method has serious lag and slow speed, which is not convenient for precise control.

[0004] In addition, the existing rolling time-domain state estimator method, which is more recognized, can remove a large number of invalid interference information of the constraint system in the reactor control, and transform the state estimation problem into an optimization problem with a fixed time-domain length. However, the response A large number of parameters in the kettle and the setting of time will affect the accuracy of estimation. However, in actual production, the setting of time domain cannot be infinite, and production efficiency and resource consumption need to be considered. Therefore, although the method is theoretical It has many advantages, but when it is applied in practice, a large number of adjustments are needed, which cannot meet the actual production needs.

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