Optimal soft sensor system and method for intelligent weighted propylene polymerization production process

An optimal soft-sensor, propylene polymerization technology, applied in electrical program control, biological neural network model, comprehensive factory control, etc., can solve problems such as low measurement accuracy and easy to be affected by human factors

Inactive Publication Date: 2016-05-18
ZHEJIANG UNIV
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  • Application Information

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Problems solved by technology

[0005] In order to overcome the shortcomings of the current existing propylene polymerization production process, such as low measurement accuracy and being easily affected by human factors, the purpose of the present invention is to provide an online measurement, online parameter optimization, fast soft measurement speed, automatic model update, anti- Intelligent Weighted Propylene Polymerization Production Process Melt Index Optimum Soft Measurement System and Method with Strong Interference Capability and High Precision

Method used

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  • Optimal soft sensor system and method for intelligent weighted propylene polymerization production process
  • Optimal soft sensor system and method for intelligent weighted propylene polymerization production process
  • Optimal soft sensor system and method for intelligent weighted propylene polymerization production process

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Embodiment 1

[0082] 1. Reference figure 1 , figure 2 and image 3 , an intelligent weighted propylene polymerization production process optimal soft measurement system, including propylene polymerization production process 1, on-site intelligent instrument 2 for measuring easily measurable variables, control station 3 for measuring operating variables, and DCS database for storing data 4 , intelligent weighted optimal soft measurement system 5 and melt index soft measurement value display instrument 6, the on-site intelligent instrument 2, the control station 3 are connected with the propylene polymerization production process 1, the on-site intelligent instrument 2, the control station 3 and the DCS database 4 connected, the DCS database 4 is connected to the input end of the intelligent weighted optimal soft sensor system 5, the output end of the intelligent weighted optimal soft sensor system 5 is connected to the melting index soft sensor value display instrument 6, and the intellige...

Embodiment 2

[0155] 1. Reference figure 1 , figure 2 and image 3 , an intelligent weighted propylene polymerization production process optimal soft-sensing method includes the following steps:

[0156] (1) For the propylene polymerization production process object, according to the process analysis and operation analysis, the operational variables and easily measurable variables are selected as the input of the model, and the operational variables and easily measurable variables are obtained from the DCS database;

[0157] (2) Preprocess the sample data, center the input variables, that is, subtract the average value of the variables; and then perform normalization processing, that is, divide by the change interval of the variable value;

[0158] (3) The PCA principal component analysis module is used to pre-whiten the input variables and de-correlate the variables. It is realized by applying a linear transformation to the input variables, that is, the principal components are obtained...

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Abstract

The invention discloses an intelligent weighing propylene polymerization production process optimal soft measurement system which comprises a propylene polymerization production process, a field intelligent instrument, a control station, a DCS database which stores data, an intelligent weighing optimal soft measurement system and a melt index soft measurement value display instrument. The field intelligent instrument and the control station are connected with the propylene polymerization production process, and are connected with the DCS database. The optimal soft measurement system is connected with the DCS database and the soft measurement value display instrument. The intelligent weighing optimal soft measurement system comprises a model updating module, a data preprocessing module, a PCA principal component analysis module, a neural network model module, an intelligent weighing optimization module and a model updating module. The invention further provides a soft measurement method which is realized by using the soft measurement system. According to the invention, online measurement and online parameter optimization are realized, and the method and the system have the advantages of quick soft measurement, automatic model updating, strong anti-interference ability and high precision.

Description

technical field [0001] The invention relates to an optimal soft-sensing system and method, in particular to an optimal soft-sensing system and method for an intelligent weighted propylene polymerization production process. 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. are closely related to daily life. 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, and develop polypropyl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/418G06N3/02
CPCY02P90/02
Inventor 刘兴高李九宝
Owner ZHEJIANG UNIV
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