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Propylene polymerization production process optimal soft survey instrument and method based on chaos optimization

An optimal soft-sensor, propylene polymerization technology, applied in chaos models, instruments, electrical program control, etc., can solve the problems of influence, low measurement accuracy, and vulnerability to human factors.

Inactive Publication Date: 2008-12-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the shortcomings of the existing propylene polymerization production process that the measurement accuracy is not high and is easily affected by human factors, the present invention provides an online measurement, automatic optimization of online parameters, fast calculation speed, automatic model update, strong anti-interference ability, High-precision soft-sensing instrument and method for optimum melt index in propylene polymerization production process based on Chaos chaos optimization

Method used

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  • Propylene polymerization production process optimal soft survey instrument and method based on chaos optimization
  • Propylene polymerization production process optimal soft survey instrument and method based on chaos optimization
  • Propylene polymerization production process optimal soft survey instrument and method based on chaos optimization

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Embodiment 1

[0093] refer to figure 1 , figure 2 and image 3 , an optimal soft measuring instrument for propylene polymerization production process based on Chaos chaos optimization, including propylene polymerization production process 1, on-site intelligent instrument for measuring easy-to-measure variables 2, control station for measuring operating variables 3, storing data The DCS database 4 and the melt index soft measurement value display instrument 6, the on-site intelligent instrument 2, the control station 3 are connected to the propylene polymerization production process 1, the on-site intelligent instrument 2, the control station 3 are connected to the DCS database 4, and the The soft sensor instrument also includes an optimal soft sensor model 5 based on Chaos chaos optimization, the DCS database 4 is connected to the input end of the optimal soft sensor model 5 based on Chaos chaos optimization, and the Chaos chaos optimization based The output end of the optimal soft sens...

Embodiment 2

[0185] refer to figure 1 , figure 2 and image 3 , a kind of optimal soft sensor method of propylene polymerization production process based on Chaos chaos optimization, described soft sensor method mainly comprises the following steps:

[0186] 1), for the propylene polymerization production process object, according to the process analysis and operation analysis, select the operational variables and easily measurable variables as the input of the model, and the operational variables and easily measurable variables are obtained from the DCS database;

[0187] 2) Preprocess the sample data, center the input variables, that is, subtract the average value of the variables; then pre-whiten the input variables, that is, decorrelate the variables, and apply a linear transformation to the input variables;

[0188] 3) Perform independent component analysis on the preprocessed data, including:

[0189] (3.1) Select a random initial weight B;

[0190] (3.2) Iteratively update B, B...

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Abstract

A propylene polymerization production process optimal soft-measurement meter based on Chaos optimization comprises a propylene polymerization production process, a site intelligent meter, a control station, a DCS databank used for storing data, an optimal soft-measurement model based on Chaos optimization, and a melting index soft-measurement value indicator. The site intelligent meter and the control station are connected with the propylene polymerization production process and the DCS databank; the optimal soft-measurement model is connected with the DCS databank and the soft-measurement value indicator. The optimal soft-measurement model based on Chaos optimization comprises a data pre-processing module, an ICA dependent-component analysis module, a neural network modeling module and a Chaos optimization module. The invention also provides a soft measurement method adopting the soft measurement meter. The invention can realize on-line measurement and on-line automatic parameter optimization, with quick calculation, automatic model updating, strong anti-interference capability and high accuracy.

Description

technical field [0001] The invention relates to an optimal soft measuring instrument and a method, in particular to an optimal soft measuring instrument and a method for a propylene polymerization production process based on Chaos chaos optimization. Background technique [0002] Polypropylene is a thermoplastic resin produced by propylene polymerization. The most important downstream product of propylene, 50% of the world's propylene and 65% of my country's propylene are used to make polypropylene. It is one of the five general-purpose plastics. Daily life is closely related. Polypropylene is the fastest growing general-purpose thermoplastic resin in the world, second only to polyethylene and polyvinyl chloride in total. In order to make my country's polypropylene products have market competitiveness, develop impact copolymer products, random copolymer products, BOPP and CPP film materials, fibers, and non-woven fabrics with good balance of rigidity, toughness, and fluidity...

Claims

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Application Information

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IPC IPC(8): G05B19/418C08F10/06C08F2/00G05B13/02G06N7/08
CPCY02P90/02
Inventor 刘兴高楼巍
Owner ZHEJIANG UNIV
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