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Reactor temperature automatic control method based on feedforward-reaction mechanism model

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

Active Publication Date: 2019-07-23
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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  • Reactor temperature automatic control method based on feedforward-reaction mechanism model
  • Reactor temperature automatic control method based on feedforward-reaction mechanism model
  • Reactor temperature automatic control method based on feedforward-reaction mechanism model

Examples

Experimental program
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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 reactor temperature automatic control method based on a feedforward-reaction mechanism model. The reactor temperature automatic control method comprises the steps that the heat accumulation rate in a reactor or the heat accumulation rate change rate in the reactor is calculated through a heat accumulation rate equation; then a feedforward value is obtained through conversion, a reactor temperature signal is transmitted to a reactor temperature controller, the reactor temperature controller calculates the deviation between a value of the reactor temperature signal and atemperature set value of the reactor temperature controller, and thus a pre-adjusted value of the flow or a temperature parameter of a reactor heat exchange medium is obtained; and the flow of the reactor heat exchange medium or the pre-adjusted value of the temperature parameter is added to the feedforward value, and the flow or the temperature of the reactor heat exchange medium is adjusted. According to the reactor temperature automatic control method, control response is fast, the lag problem or the nonlinearity problem in the reactor temperature control process can be solved, the overshoot of reactor temperature control is decreased, the stability of a reactor temperature control system and control accuracy of the reactor temperature are improved advantageously.

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 Applications(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