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Dynamic fault diagnostic method of polymer aggregation in gas-solid fluidized bed reactor

A fluidized bed reactor, fault diagnosis technology, applied in the processing of detection response signals, using sound waves/ultrasonic waves/infrasonic waves to analyze solids, etc., can solve problems such as agglomeration faults, and achieve the effect of convenient installation and use

Inactive Publication Date: 2010-06-16
ZHEJIANG UNIV
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Problems solved by technology

[0004] Aiming at the problem that agglomeration faults are prone to occur in the current gas phase polyethylene production process, the present invention provides a dynamic fault diagnosis method for polymer agglomeration in a gas-solid fluidized bed reactor

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  • Dynamic fault diagnostic method of polymer aggregation in gas-solid fluidized bed reactor
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  • Dynamic fault diagnostic method of polymer aggregation in gas-solid fluidized bed reactor

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Embodiment Construction

[0031] The dynamic fault diagnosis method of polymer agglomeration in the gas-solid fluidized bed reactor of the present invention comprises the following steps:

[0032] 1. Based on the analysis of the process operation mechanism and previous fault treatment reports, select the following 14 key variables that affect the caking fault: 11 wall temperatures of the reactor from bottom to top T_RX_B~T_RX_H to T_RX_J~T_RX_M, reaction The bulk density of the upper part of the reactor D_Upper, the bulk density of the lower part of the reactor D_Lower, the pressure drop of the reactor distribution plate P_RXplate, construct the fault detection variable set [T_RX_B T_RX_C T_RX_DT_RX_E T_RX_F T_RX_G T_RX_H T_RX_J T_RX_K T_RX_L T_RX_M D_Upper D_LowerP_RXplate]. According to the requirements of dynamic principal component analysis modeling, in the case of no agglomeration, according to the dynamic corresponding characteristics of the operation of the gas-solid fluidized bed reactor, three ...

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Abstract

The invention discloses a dynamic fault diagnostic method of polymer aggregation in a gas-solid fluidized bed reactor. By using the method, a fault detection variable set formed by a plurality of key variables which have influence on the fault aggregation is selected, a fault diagnostic model by applying a multi-component dynamic principle component analysis theory is established and a control limit for detecting whether faults generate or not by combining with a nuclear density estimation technology is determined. The invention avoids the complicated process mechanism analysis, has the remarkable advantages of directly utilizing the existing measurement variable of DCS, not needing to add any hardware investment or installing any equipment, adding a section of functional module only in a DCS engineers and having convenient installation and use besides the advantages of non-inserting type, safety, environmental protection and accurate sensitivity.

Description

technical field [0001] The invention belongs to the technical field of fault diagnosis of a gas-solid fluidized bed reactor, in particular to a fault diagnosis method for polymer agglomeration in a gas-solid fluidized bed reactor. Background technique [0002] The gas-phase polyethylene method with the gas-solid fluidized bed reactor as the core equipment is the mainstream process in the current polyethylene production. It has the advantages of short process flow, less equipment, and low production cost. It does not use solvents and saves solvent separation, Recycling and refining, full density polyethylene products can be produced on the same device, and the energy consumption is greatly reduced. However, this process also has the outstanding problem of easy caking. In actual production, due to static electricity in the reactor, too high or too low bed material level, blockage of distribution plate, decrease of fluidization gas velocity, sudden change of catalyst activity,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N29/04G01N29/44
Inventor 郑平友刘育明杜丽梁军
Owner ZHEJIANG UNIV
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