Abstract
When a malfunction occurs in a marine gas turbine, its thermal efficiency will decrease slightly, and the gas path fault is often difficult to distinguish. In order to solve this problem, based on the second law of thermodynamics, the endogenous irreversible loss (EIL) model of the marine gas turbine is established, and the exergy loss analysis under normal conditions is carried out to verify the accuracy of the model. The fault diagnosis of gas turbine gas path based on EIL is proposed, and a simulation experiment conducted on a three-shaft marine gas turbine demonstrated that the proposed approach can detect and isolate gas path fault accurately under different operating conditons and enviroments.
Highlights
A gas turbine is a complex thermal system
Taking a marine three-shaft gas turbine as an example, the simulation results of the endogenous irreversible loss (EIL) under typical gas path fault are obtained, and a simulation case was carried out to verify the fault diagnosis method based on EIL
A gas path fault diagnosis method based on EIL has been presented to detect and isolate the gas path faults of marine gas turbines
Summary
A gas turbine is a complex thermal system. Its operation process is a cross-coupled thermodynamic process. When a gas path fault occurs, the parameter change may be extremely weak and difficult to monitor It is a new idea and direction to diagnose the gas path of gas turbine based on the exergy loss [19,20,21,22,23,24,25]. A new fault diagnosis method suitable for the marine three-shaft gas turbine is urgently needed. In this regard, we have conducted the following research.
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