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Fault diagnosis method of catalytic cracking main draught fan group closed-loop control in petrochemical equipment

A catalytic cracking and closed-loop control technology, which is applied in the direction of program control, general control system, control/regulation system, etc., can solve the problems of weakened closed-loop effect of the external performance of faults, and the failure of the main fan unit of catalytic cracking cannot be effectively diagnosed, etc. To achieve the effect of ensuring accuracy

Inactive Publication Date: 2018-11-23
GUANGDONG UNIV OF PETROCHEMICAL TECH
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Problems solved by technology

[0002] The main air unit for catalytic cracking is an indispensable equipment in the petrochemical system. The main air unit for catalytic cracking belongs to closed-loop control in the working process, and the closed-loop control will suppress some symptoms of failure. It is a known fact that some closed-loop systems of linear systems The control form has a natural fault-tolerant ability to actuator deviation faults, and the external manifestations of most faults will be weakened by the closed-loop effect, so that the faults of the catalytic cracking main fan unit cannot be effectively diagnosed in the closed-loop state

Method used

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  • Fault diagnosis method of catalytic cracking main draught fan group closed-loop control in petrochemical equipment
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  • Fault diagnosis method of catalytic cracking main draught fan group closed-loop control in petrochemical equipment

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Embodiment 1

[0021] The present invention provides such Figure 1-3 A closed-loop control fault diagnosis method for the catalytic cracking main fan unit in petrochemical equipment is shown, which specifically includes the following steps:

[0022] Step 1: If the model uncertainty and nonlinear structural information are known, the method of unknown input observer can be adopted, so that the gain from the control signal to the residual signal is zero, that is, the residual signal is decoupled from the control signal;

[0023] Step 2: If the decoupling cannot be realized, the influence of the residual signal and uncontrollable factors can be made as small as possible in the sense of mathematical expectation or robust criterion, and the forward or reverse recursive Riccati equation can be used to solve it;

[0024] Step 3: Finally, the probability density function can be used to analyze the impact of this change on the fault false alarm rate and false negative rate in a statistical sense, an...

Embodiment 2

[0029] The present invention provides such Figure 1-3 A closed-loop control fault diagnosis method for the catalytic cracking main fan unit in petrochemical equipment is shown, which specifically includes the following steps:

[0030] Step 1: If the residual generator needs to consider other performance indicators such as detection delay and anti-disturbance, instead of simply considering reducing the impact of closed-loop feedback, it needs to use residual recursion to analyze historical feedback control through triangle inequality and Cauchy inequality For the worst possible impact of the residual magnitude and some eigenvalues, adjust the form of the residual evaluation function and the corresponding threshold;

[0031] Step 2: Finally, the probability density function can be used to analyze the impact of this change on the fault false alarm rate and false negative rate in a statistical sense, and the correlation analysis is carried out by using / unsupervised learning metho...

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Abstract

The invention discloses the fault diagnosis method of catalytic cracking main draught fan group closed-loop control in petrochemical equipment. The method comprises the following steps that step1, ifthe uncertainty and nonlinear structure information of a model are known, an unknown input observer method can be adopted so that a gain from a control signal to a residual signal is zero, which meansthat the residual signal is decoupled from the control signal; and step2, if decoupling can not be realized, the affects of the residual signal and uncontrollable factors can be minimized in the sense of mathematical expectation or a robustness rule, and a forward or backward recursive Riccati equation is used to solve. In the invention, under the condition of a closed loop, different operationscan be performed depending on whether feedback can be completely decoupled so that an equipment fault can be effectively diagnosed under the closed-loop state.

Description

technical field [0001] The invention relates to the technical field of fault diagnosis, in particular to a fault diagnosis method for closed-loop control of a catalytic cracking main fan unit in petrochemical equipment. Background technique [0002] The main air unit for catalytic cracking is an indispensable equipment in the petrochemical system. The main air unit for catalytic cracking belongs to closed-loop control in the working process, and the closed-loop control will suppress some symptoms of failure. It is a known fact that some closed-loop systems of linear systems The control form has a natural fault-tolerant ability to actuator deviation faults, and the external manifestations of most faults will be weakened by the closed-loop effect, so that the faults of the catalytic cracking main fan unit cannot be effectively diagnosed in the closed-loop state. [0003] Therefore, it is necessary to invent a closed-loop control method for the fault diagnosis of the catalytic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B23/02
CPCG05B23/0243G05B2219/24065
Inventor 孙国玺孙飞昊张华威
Owner GUANGDONG UNIV OF PETROCHEMICAL TECH
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