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Quick and overregulation-free cooling crystallization reaction kettle temperature control method

A temperature control method and crystallization reactor technology, which are applied in the direction of temperature control using electric methods, to achieve optimal control performance, fast and non-overshoot cooling control effect, and overcome time-varying uncertainty

Active Publication Date: 2015-09-02
DALIAN UNIV OF TECH
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  • Abstract
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is aimed at the problem of rapid cooling without overshoot in the industrial cooling crystallization process

Method used

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  • Quick and overregulation-free cooling crystallization reaction kettle temperature control method
  • Quick and overregulation-free cooling crystallization reaction kettle temperature control method
  • Quick and overregulation-free cooling crystallization reaction kettle temperature control method

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Embodiment Construction

[0018] In order to better understand the technical solutions of the present invention, the implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0019] The embodiment adopts 10 liters of crystallization reaction kettles, and 4 liters of glutamic acid aqueous solutions with a concentration of 10% are installed inside, and a refrigeration / heating circulator is configured, which is composed of a Freon cooling compressor with a cooling power of 2kw and an electronic heating tube with a heating power of 2kw . The refrigerating power of the freon cooling compressor is turned on and the operating range is 40-100%, and the heating power of the electronic heating tube is turned on and the operating range is 0-100%.

[0020] The specific implementation steps of the present invention are as follows:

[0021] Step 1: Open-loop cooling identification

[0022] First, turn on the electronic heating tube to raise t...

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Abstract

Provided is a quick and overregulation-free cooling crystallization reaction kettle temperature control method. According to the method, a refrigeration compressor with a variable-frequency power regulation function, an electronic heating tube based on pulse width modulation power, a programmable controller and a monitoring computer are used to construct a temperature control system. First, a square wave excitation experiment is adopted, namely, the temperature change of a crystallization reaction kettle is detected by periodically changing the power of the refrigeration compressor, and a cooling response transfer function model of the crystallization reaction kettle is established according to experimental data; then, a robust closed-loop control system and the form of the controller are designed based on the response model; and finally, the suitable range of the parameters of the controller is set according to the actual executable power of the refrigeration compressor and the electronic heating tube and the working condition constraints of the reaction kettle. By adopting the method of the invention, the cooling rate of solution in the reaction kettle can be regulated quantitatively to ensure no overregulation and reach a specified target value of cooling. Thus, a convenient and reliable method of automatic control is provided for cooling regulation of the crystallization process.

Description

technical field [0001] The invention belongs to the technical field of industrial process control, and relates to a temperature control system of an industrial crystallization reactor, in particular to a method for quickly controlling the temperature of a cooling crystallization reactor without overshoot. Background technique [0002] Chemical reactors used for crystallization and biological fermentation generally use temperature control to regulate the production process. Temperature control mainly includes heating, cooling, and constant temperature. For the crystallization process, the precipitation of crystal products is mainly realized by cooling. Since the cooling rate and stability directly determine the quality and size of crystal products, cooling control is the core technology of the cooling crystallization process. In actual engineering practice, due to the inconsistency of the volume of the reactor and the large difference in the heat transfer characteristics of v...

Claims

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Application Information

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IPC IPC(8): G05D23/19
Inventor 刘涛许佳荣世立董世健仲崇权
Owner DALIAN UNIV OF TECH
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