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A Fast Multivariable Predictive Control Method for Ethylene Cracking Furnace

An ethylene cracking furnace, predictive control technology, applied in general control systems, control/regulation systems, instruments, etc.

Active Publication Date: 2020-02-14
MICROCYBER CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0014] In view of the multi-variable and fast-response problems in the production process of the above-mentioned ethylene cracking furnace, the present invention proposes a fast multi-variable control method to solve the control problem of the ethylene cracking furnace

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  • A Fast Multivariable Predictive Control Method for Ethylene Cracking Furnace
  • A Fast Multivariable Predictive Control Method for Ethylene Cracking Furnace
  • A Fast Multivariable Predictive Control Method for Ethylene Cracking Furnace

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Embodiment Construction

[0071] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0072] The present invention has offline and online links. In the off-line link, the dynamic mathematical model and the steady-state mathematical model of the ethylene cracking furnace production process are obtained through analysis or identification methods, and control parameters are set. In the online link, the output prediction value is first calculated according to the measured value of the ethylene cracking furnace control system (DCS), and the prediction error is calculated according to the difference between the predicted value and the measured value to correct the steady-state output prediction value; then, through steady-state optimization or direct inversion The method calculates the predictive value of the steady-state control input; finally calculates the control input value at the current moment according to the given control pa...

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Abstract

The invention relates to a quick multivariable predication control method for an ethylene cracking furnace. The method has an offline link and an online link. In the offline link, a dynamic mathematic model and a static mathematic model of a production process of the ethylene cracking furnace are obtained through an analysis or recognition method and control parameters are set. In the online link, a prediction value is calculated and output according to a measurement value of an ethylene cracking furnace control system (DCS), a predication error is calculated based on the difference between the predication value and the measurement value and accordingly a static output predication value is corrected; and then a static control input predication value is calculated through static optimization or a direct inversion method; and finally a control input value of a current moment is calculated according to a given control parameter, the dynamic performance of the control input value is corrected through a lead-lag link and the corrected value is then transmitted to the DCS. According to the invention, the calculation complexity for multivariable prediction control is simplified and the control period of multivariable prediction control is reduced distinctively, and control problems in quick reaction processes of the ethylene cracking furnace and the like can be solved effectively.

Description

technical field [0001] The invention relates to the field of industrial process control, in particular to a control method for ethylene cracking furnaces, in particular to a rapid multivariable control method. Background technique [0002] The ethylene unit is one of the most energy-consuming units in the petrochemical industry. The cracking furnace is the key equipment of the ethylene plant, and it is also the major energy consumer of the ethylene plant, and its energy consumption accounts for 50% to 60% of the total energy consumption of the ethylene plant. Reducing the energy consumption of the cracking furnace is one of the important ways to reduce the production cost of ethylene. The use of advanced control technology to operate the ethylene cracking furnace can improve the optimal control operation of the ethylene and propylene recovery furnaces, which will help reduce the production energy consumption of the ethylene unit. [0003] The ethylene plant is mainly compo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B17/02
CPCG05B17/02
Inventor 邹涛潘昊郑洪宇张鑫汪志勇
Owner MICROCYBER CORP
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