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An Automatic Control Method of Reactor Temperature Based on Feedforward-Reaction Mechanism Model

A technology of reaction mechanism and temperature controller, applied in the direction of temperature control, non-electric variable control, control/regulation system, etc., can solve the problem that the temperature control of the reactor cannot be accurate, fast, stable, and the temperature response temperature response process is nonlinear, etc. question

Active Publication Date: 2021-04-20
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These adjustments are all based on the detected reactor temperature. There is a temperature response hysteresis and a nonlinear temperature response process, which leads to the inability of the reactor temperature control to be accurate, fast and stable in the true sense.

Method used

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  • An Automatic Control Method of Reactor Temperature Based on Feedforward-Reaction Mechanism Model
  • An Automatic Control Method of Reactor Temperature Based on Feedforward-Reaction Mechanism Model
  • An Automatic Control Method of Reactor Temperature Based on Feedforward-Reaction Mechanism Model

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Taking the temperature control process of butyl acrylate reactor as an example, the reaction of butyl acrylate is as follows:

[0064] AA+BuOH→BA (9)

[0065] Among them, AA represents acrylic acid, BuOH represents butanol, and BA represents butyl acrylate.

[0066] The reactant acrylic acid feed flow rate is 1000mol / h, the feed temperature of acrylic acid is 35°C, the molar mass of acrylic acid is 72g / mol, the specific heat capacity of acrylic acid is 1.97kJ (kg·°C); the feed flow rate of butanol is 1200mol / h, butanol The feed temperature is 40°C, the molar mass of butanol is 74g / mol, the specific heat capacity of butanol is 2.08kJ (kg·°C), the reactor temperature is 98°C, and the reaction heat of butyl acrylate is -167kJ / mol.

[0067] The reaction kinetic equation of butyl acrylate is:

[0068] r BA =1.17x10 -5 c AA c BUOH (10)

[0069] Among them, r BA is the reaction rate of butyl acrylate, c AA is the molar concentration of acrylic acid in the reactor, c ...

Embodiment 2

[0090] Taking the temperature control process of the ethyl acetate reactor as an example, the ethyl acetate reaction proceeds in the form of a reversible reaction, expressed as follows:

[0091]

[0092] The feed flow rate of reactant acetic acid is 700mol / h, the feed temperature of acetic acid is 40°C, the molar mass of acetic acid is 60g / mol, and the specific heat capacity of acetic acid is 1.1kJ (kg°C); the feed flow rate of ethanol is 700mol / h, and the feed flow rate of ethanol The temperature is 40°C, the molar mass of ethanol is 46g / mol, the specific heat capacity of ethanol is 0.8kJ (kg·°C), the reaction temperature is 60°C, and the heat of reaction of ethyl acetate is -72kJ / mol.

[0093] Ethyl acetate reaction kinetic equation is:

[0094] r 乙酸乙酯 =8.65x10 -6 c 乙酸 c 乙醇 -3.21x10 -6 c 乙酸乙酯 c 水 (9)

[0095] Among them, r 乙酸乙酯 is the reaction rate of ethyl acetate, c 乙酸 is the molar concentration of acetic acid in the reactor, c 乙醇 is the molar concentration ...

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Abstract

The invention provides a method for automatically controlling the temperature of a reactor based on a feedforward-reaction mechanism model. Through the heat accumulation rate equation, the heat accumulation rate in the reactor or the rate of change of the heat accumulation rate in the reactor is calculated; and then a conversion is obtained. Feedforward value, the reactor temperature signal is sent to the reactor temperature controller, and the reactor temperature controller calculates the deviation between the value of the reactor temperature signal and the temperature setting value of the reactor temperature controller to obtain the reactor heat transfer The pre-adjustment value of the flow rate or temperature parameter of the medium; add the pre-adjustment value of the flow rate or temperature parameter of the reactor heat exchange medium and the feed-forward value to adjust the flow rate or temperature of the reactor heat exchange medium. The method has fast control response, can overcome the hysteresis problem and nonlinear problem existing in the reactor temperature control process, reduce the overshoot of the reactor temperature control, and is conducive to improving the stability of the reactor temperature control system and the control accuracy of the reactor temperature .

Description

technical field [0001] The invention relates to a method for automatically controlling the temperature of a reactor in the field of chemical industry, in particular to a method for automatically controlling the temperature of a reactor based on a feedforward-reaction mechanism model. Background technique [0002] The chemical process is an important part of the process industry and an important pillar of the country's basic economy. The production of chemical products mainly includes three parts: refining, reaction and separation of chemical raw materials. The reaction of chemical raw materials is the most core part, which often determines the quality and cost of the produced products. Chemical reactions generally need to be kept within a specific temperature range to maintain the best product conversion rate, yield and quality, and the chemical reaction temperature also determines the safety of the production process. Therefore, maintaining the temperature stability and p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05D23/20
CPCG05D23/20
Inventor 卢大鹏田宇王远辉郑梁王浩董玉玺刘刚朱敏燕张宏科
Owner WANHUA CHEM GRP CO LTD