Method for calculating self-optimizing controlled variable during forced circulation and evaporation control in process of alkali liquid concentration and production

A technology of forced circulation evaporation and production process, which is applied in the calculation field of self-optimized controlled variables

Inactive Publication Date: 2015-09-30
NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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Problems solved by technology

However, most of the self-optimizing control methods reported in the existing literature are based on the linearization model of the system or require piecewise linearization of the system, and the calculation method and optimization performance of the controlled variable have certain limitations.

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  • Method for calculating self-optimizing controlled variable during forced circulation and evaporation control in process of alkali liquid concentration and production
  • Method for calculating self-optimizing controlled variable during forced circulation and evaporation control in process of alkali liquid concentration and production
  • Method for calculating self-optimizing controlled variable during forced circulation and evaporation control in process of alkali liquid concentration and production

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Embodiment Construction

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0021] This preferred embodiment takes the evaporation process in the alumina Bayer process as an example, and its evaporator is a process such as figure 1 The shown forced circulation single-effect evaporator concentrates the dilute alkali solution, and the calculation method of the self-optimized controlled variable of the forced circulation evaporation control process in the alkali liquor concentration production process includes the following steps:

[0022] (1) For inlet steam pressure P 100 and product lye concentration X 2 For constraint control, the separator liquid level L 2 Perform stability control.

[0023] Among them, X 2 Larger means that more solvent needs to be evaporated, which will lead to an increase in the amount of steam required, cooling water and pump power consumption, so only X 2 It is optimal to control it at the...

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Abstract

The invention discloses a method for calculating a self-optimizing controlled variable during forced circulation and evaporation control in the process of alkali liquid concentration and production. The method is characterized by including: through constraint control on inlet steam pressure and product alkali liquid concentration and stable control on separator liquid level, performing offline optimization on multiple disturbance circumstances acquired by sampling in disturbance space through a numerical value optimization algorithm to acquire corresponding optimal values of multiple groups of output variables; performing feature value decomposition on a matrix structured by the optimal values of the output variables; acquiring the self-optimizing controlled variable through a feature vector corresponding to a minimum feature value and a group of the output variables so as to quickly and effectively determine a self-optimizing controlled variable of a bottom-layer control loop. Online realtime optimization of the process of forced circulating and evaporation control can be indirectly realized by only online tracking a constant set value of the self-optimizing controlled variable.

Description

technical field [0001] The invention relates to a lye concentration production process, in particular to a calculation method for a self-optimized controlled variable in a forced circulation evaporation control process in the lye concentration production process. Background technique [0002] High-concentration lye (the concentration of lye exceeds 40%) is used as the main auxiliary material in the dissolution step of the alumina production process by the Bayer method. Added to the production process of alumina. In the process of alumina production, single-effect evaporator is generally used for the concentration of lye, and the working flow chart of single-effect evaporator is as follows figure 1 As shown, the stable quality of high-concentration lye is obtained through forced circulation evaporation control. [0003] How to obtain an excellent forced circulation evaporation control effect is a key research field for those skilled in the art. The control effect can usuall...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B19/418
CPCY02P90/02G05B19/41865
Inventor 叶凌箭关宏伟李英道马修水宋执环
Owner NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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