Chlorination reaction temperature control method, system and equipment

Abstract

The invention discloses a chlorination reaction temperature control method, a system and equipment. The method comprises the following steps of according to a preset target control curve, determiningthe starting moment of a cooling valve by utilizing the temperature in a current kettle, a corresponding preset temperature threshold value, a temperature change rate in the current kettle and a corresponding preset temperature change rate threshold value, and controlling the cooling valve to be started at the determined moment so as to carry out cooling treatment on the reaction kettle; accordingto a preset rule, determining the closing moment of the cooling valve by utilizing the temperature in the current kettle, the corresponding preset temperature threshold value, the temperature changerate in the current kettle and the corresponding preset temperature change rate threshold value, and controlling the cooling valve to be closed at the determined moment. Based on the chlorination reaction temperature control method, the corresponding valve can be adjusted automatically according to the preset target control curve, and the temperature in the reaction kettle at each reaction stage can be controlled within a required process error. Meanwhile, the control precision is improved, and the overshoot amount is reduced.

Description

technical field [0001] The invention relates to the field of chlorination reaction temperature control, in particular to a chlorination reaction temperature control method, system and equipment. Background technique [0002] Chlorination reaction temperature control is a key link in the production process of chlorinated polyethylene. High or low chlorination reaction temperature will affect the depth of the reaction and the conversion rate of the reaction. In addition, the size of the temperature change will directly affect the product quality. The reaction kettle is an important equipment in the chemical production process. The reaction process is accompanied by a large number of heat absorption and heat release. It has the characteristics of large hysteresis, time-varying, nonlinear, etc., and has high requirements for the control of the controlled object. The traditional PID control method is a control method based on process parameters. Its design depends on the precise...

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Problems solved by technology

The traditional PID control method is a control method based on process parameters. Its design depends on the precise mathematical model of the controlled object. characteristics, the traditional PID control method will lead to large fluctuations in temperature, and relying on manual experience to manually adjust parameters is often inaccurate due to factors such as skill level and working status, so the conventional PID control method cannot be used in the entire reaction production The temperature is automatically controlled within the cycle, and it may cause low control accuracy, large overshoot, poor anti-interference ability, etc., which makes it difficult to meet the process production requirements

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