Garbage incinerator fault risk assessment method based on fuzzy Petri network

Abstract

The invention discloses a garbage incinerator fault risk assessment method based on a fuzzy Petri network. The garbage incinerator fault risk assessment method comprises the steps that fault state risks possibly existing in the operation process of all subsystems of a garbage incinerator are assessed; the condition event and the relative probability of each fault state are evaluated; a fuzzy Petri net graph model is constructed; generating an input matrix, an output matrix, a place credibility vector and a transition confidence vector by combining the fault state, the fault state possibility, the condition event and the condition event relative probability of the garbage incinerator; converting the graph model into a mathematical model and carrying out iterative operation; and finally, the possibility of the key fault of the garbage incinerator is obtained. According to the method, the defect that an existing risk assessment method focuses on qualitative analysis is overcome, the possibility of various faults can be quantitatively obtained, the structure of the fuzzy Petri network is effectively utilized, concurrent faults among the subsystems are considered, and the reliability of fault diagnosis is improved.

Description

technical field [0001] The invention relates to the field of failure risk assessment of waste incineration, in particular to a method for assessing failure risk of waste incinerators based on fuzzy Petri nets Background technique [0002] Incineration has the advantages of small footprint, high treatment efficiency, environmental protection and energy saving. At the same time, the components of domestic waste are complex, and the operation status of waste incinerators is complex, and the failure process is often uncontrollable. explosion and fire, which will bring harm to people, economy and environment. The core of failure risk assessment is to use the arrangement of early operation and maintenance, and integrate and utilize existing resources to realize the control of key failure points and prevent failures from occurring in the future. [0003] Common evaluation methods include: safety checklist, accident tree analysis, pre-hazard analysis, event tree analysis, and hazar...

AI Technical Summary

Problems solved by technology

Only fault tree and event tree analysis can describe the process of simple concurrent accidents, while the operation system of waste incinerator has typical random characteristics, and waste incinerator is a complex system involving the joint operation of multiple devices. The traditional failure risk assessment method It is difficult to achieve fine evaluation. The constituent elements of Petri net have a strong ability to describe concurrent events. By expressing the conditions of system changes and the system status before and after the changes, it can describe various activity states that may occur in the system, as well as activities. The relationship between state changes and changes, there are still few studies on the fault evaluation of waste incinerators

[0004] In the prior art, for example, in the patent application "Power System Fault Handling Method Based on Fuzzy Fault Petri Net" by Li Ming et al., fuzzy Petri net is used for fault diagnosis, which divides a fault cause into completely independent subsystems. This method It is suitable for systems with strong independence of components such as diesel engines and bearings, but it is not suitable for complex systems with nonlinear high concurrency such as garbage incinerators

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