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Method for controlling sugar boiling crystallization process based on sequential extreme learning machine

A technology of extreme learning machine and process control, which is applied to computer parts, instruments, character and pattern recognition, etc., and can solve problems such as unsatisfactory results, difficulty in establishing mathematical models, and complex massecuite environments

Inactive Publication Date: 2016-04-13
GUANGXI UNIV
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Problems solved by technology

However, the existing automatic control system is not ideal at the stage of following the process curve. The main reason is that the massecuite environment in the tank is very complicated, and it is difficult to establish a corresponding mathematical model. curve approximation

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  • Method for controlling sugar boiling crystallization process based on sequential extreme learning machine
  • Method for controlling sugar boiling crystallization process based on sequential extreme learning machine
  • Method for controlling sugar boiling crystallization process based on sequential extreme learning machine

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Embodiment Construction

[0063] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0064] like figure 1 and figure 2 As shown, the sugar crystallization process control method based on sequential extreme learning machine includes the following steps:

[0065] (1), divide the process curve of the sugar boiling and crystallization process into multiple stages, and set the control targets for the Brix and liquid level of each stage;

[0066] (2), with feed flow rate and feed time as input, liquid level variation and brix variation of massecuite as output, build the control model of the process parameter of boiling sugar crystallization process based on sequential extreme learning machine;

[0067] (3), adopt the least squares method to construct the objective function between the output of step (1) c...

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Abstract

The invention discloses a method for controlling a sugar boiling crystallization process based on a sequential extreme learning machine. The method comprises: constructing a control model of sugar boiling crystallization process parameters based on the sequential extreme learning machine by using a feed flow rate and a feed time as inputs and using a liquid level variant and a brix variant as outputs; constructing a target function according to process requirements, and rapidly solving the target function in combination with a particle swarm optimization algorithm to optimize the feed flow rate and the feed time. By adopting the method, an on-line learning mechanism of the sequential extreme learning machine is constructed, a rolling optimization mechanism is formed, and follow-up adaptive control is constructed. The method can be used for detecting the liquid level and the brix change rate of the sugar boiling crystallization process online and adaptively adjusting the feed flow rate according to real-time errors, thus meeting the process requirement of synchronous rise of the liquid level and the brix, having strong feasibility and replacing a manual operation to realize automatic boiling of the sugar boiling crystallization process.

Description

technical field [0001] The invention belongs to the technical field of sugar boiling crystallization process control, and in particular relates to a sugar boiling crystallization process control method based on a sequential extreme learning machine. Background technique [0002] The most critical stage in the crystallization process of boiled sugar is the crystal growth stage. According to the technological requirements of boiling sugar, it is necessary to cultivate the fine grains in the massecuite into large grains in the crystal growth stage. The method of realizing this is to deliver low-concentration syrup to the sugar crystallization tank during the cooking process, and promote the crystallization in the tank by steam heating. The massecuite absorbs the sugar from the low-concentration syrup, which boils the fine grains into white sugar granules to specification. After many years of experience summed up by engineers, it can be known that the crystal growth stage is eq...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/62
CPCG06F18/243G06F18/214
Inventor 蒙艳玫李文星谢延鹏郑康元胡飞红李广全
Owner GUANGXI UNIV
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