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A Calculation Method of Time Delay Tolerance Index of Chemical Reactor System

A technology of reactor system and calculation method, applied in calculation, computer-aided design, instrument, etc., can solve problems such as deterioration of operating conditions and reduction of heat transfer coefficient, and achieve the effect of improving safety and reliability

Active Publication Date: 2019-08-20
DONGGUAN UNIV OF TECH
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Problems solved by technology

For example, the reduction of heat transfer coefficient caused by fouling may not be dealt with or controlled in time within a certain operation cycle, and as the operation time prolongs, the operating conditions will further deteriorate due to the influence of uncertain parameters

Method used

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  • A Calculation Method of Time Delay Tolerance Index of Chemical Reactor System
  • A Calculation Method of Time Delay Tolerance Index of Chemical Reactor System
  • A Calculation Method of Time Delay Tolerance Index of Chemical Reactor System

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Embodiment Construction

[0020] Assuming that the critical point of the change of the uncertain parameter that limits the flexibility of the system can be determined or known, by introducing the variable of the delay tolerance index and referring to the solution problem of the flexibility index (DFI), the following solution of the delay tolerance problem (DTI) of the chemical system is obtained Expression model:

[0021]

[0022] in, d is a design vector related to the size of the operating unit, which remains unchanged during the operation; x To describe the state variables of the process system; z is a vector set of control variables that can be adjusted; θ for uncertain parameters and T is the change interval of the uncertain parameter; h and g are process equality constraints and inequality constraints, respectively; superscripts U and L represent uncertain parameters θ and control variable z upper and lower limits; t is the time variable, τ Indicates the lag time variable of the sy...

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Abstract

The invention discloses a calculation method for the time lag tolerance index of a chemical reactor system. The calculation method comprises the following steps of: firstly, carrying out modeling on the reactor system, and adopting a Taylor expansion and Laplace transform to linearize the reactor system into a transfer function model which contains an uncertain parameter and a time lag value; then, adopting a control strategy of PID (Proportion Integration Differentiation) closed-loop control to carry out a dynamic response performance test on the system, wherein a PID parameter is optimized through the NCD (Nonlinear Control Design Package) module of MATLAB; and finally, combining a bisection method with the dynamic response performance test result of the system to solve a maximum time lag value [Tao]max which can be tolerated by the system. By use of the method, the maximum time lag value which can be tolerated by the reactor system under a certain control strategy can be quickly, simply and effectively determined so as to improve the safety and the reliability of the practical operation of the chemical reactor system which contains the uncertain parameter.

Description

technical field [0001] The invention relates to a calculation method of a time-lag tolerance index of a chemical reactor system, in particular to a calculation method of a time-lag tolerance index of a chemical reactor system with an uncertain heat transfer coefficient. Background technique [0002] In the operation process of some actual chemical systems, the uncertain parameters cannot be adjusted in actual working conditions. For example, the reduction of heat transfer coefficient caused by fouling may not be dealt with or controlled in time within a certain operating cycle, and as the operating time prolongs, the operating conditions will further deteriorate due to the influence of uncertain parameters. In this case, in order to ensure the safety and reliability of the actual operation of the chemical system, it is very necessary to solve and analyze the maximum time delay that the system can tolerate, so that in the actual operation process, the transmission distance of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/20G06F2119/12
Inventor 黄卫清谭桂平程志毓柳鹏
Owner DONGGUAN UNIV OF TECH
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