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Method for predicting faults in cascade polymerization reaction process of high density polyethylene (HDPE)

A technology of high-density polyethylene and cascade polymerization reaction, which is applied in the direction of using electromagnetic flowmeters to detect fluid flow, thermometers, and heat measurement. It can solve problems such as complex process structures, waste loss, and impact on enterprise production efficiency.

Active Publication Date: 2012-10-31
BEIJING UNIV OF CHEM TECH
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Problems solved by technology

However, due to the complex process structure of the HDPE production system, the key quality variables of the system need to be analyzed offline. Once a small deviation occurs somewhere in the production process, the cause of the failure cannot be inferred in time, which greatly affects the production efficiency of the enterprise.
In addition, due to the overhaul after the system has problems, the generated waste has brought huge losses to the enterprise, and the sick work of the equipment may even cause more serious damage

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  • Method for predicting faults in cascade polymerization reaction process of high density polyethylene (HDPE)
  • Method for predicting faults in cascade polymerization reaction process of high density polyethylene (HDPE)
  • Method for predicting faults in cascade polymerization reaction process of high density polyethylene (HDPE)

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[0229] As shown in Table 1, it is a list of all detection primitives that affect the quality indicators of polyethylene products. The specifications of polyethylene products in the industry are mainly distinguished according to the melt index MI (Melt Index) and the density ρ (Density), in which, because the density of the polymer is through the feed between ethylene and the comonomer 1-butene monomer The comonomer is only added in the second reactor to adjust the polymer density, so the product density in the first reactor is not considered as a reaction characteristic parameter, that is to say, a reactor melt index MI 1 , Melt index MI of the second reactor 2 And the second reactor density ρ is the main parameter reflecting the product quality of polyethylene production. Through the analysis of material balance and energy balance in the HDPE reaction process, the weakly correlated nodes are eliminated from all the detection nodes of the HDPE device, and each detection varia...

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Abstract

The invention provides a method for predicting faults in the cascade polymerization reaction process of high density polyethylene (HDPE), which is applied to the technical field of HDPE production. The method is characterized by building, in combination with the extension theory, a process multi-dimensional element model combining quantitative and qualitative analysis, exploring the divergence, correlation, implication and extendability of such elements as process parameters of the model, operating parameters and equipment parameters, focusing on study of the fault recognition strategies based on extension inference, building a reaction process model in combination with the artificial neural network technology, improving the fault prediction performance and finally forming the method for predicting the faults in the cascade polymerization reaction process of HDPE with production grade being 9455F. The method has the characteristics of flexibility in representation modes, strong inferential capability, low use requirements of users and convenience in management and offers helps for ensuring safe HDPE production and improving the polymer product quality.

Description

technical field [0001] The present invention is based on the cascaded polymerization reaction process of high density polyethylene (HDPE) with the production grade of 9455F, and proposes an online data preprocessing, neural network modeling and extension fault related to the complex process industry. method of identification. Background technique [0002] With the rapid progress of polymer material science and technology and the continuous improvement of production technology, a revolutionary progress has taken place in the field of pipelines, namely "plastic strip steel". In this revolution, High Density Polyethylene (HDPE) pipes are favored because of their extremely high mechanical strength and high-speed processing performance, and are currently widely used in gas transmission, water supply, sewage, and agricultural irrigation , fine particle solid transportation in mines, and oil fields, chemical industry, post and telecommunications and other fields, especially in gas...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/00G01F1/58G01K7/02G01L7/06G06N3/02
Inventor 徐圆朱群雄耿志强彭荻刘辛新陈彦京王艳清李芳史晟辉林晓勇
Owner BEIJING UNIV OF CHEM TECH
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