CN-121208476-B - Plasma ignition layering fault investigation method for marine gas turbine

CN121208476BCN 121208476 BCN121208476 BCN 121208476BCN-121208476-B

Abstract

The invention relates to the technical field of fault diagnosis of ship power devices, and discloses a method for checking plasma ignition layering faults of a ship gas turbine, which is characterized in that a special safety test environment consisting of an insulating box body and an observation window is firstly constructed according to the characteristics of a double-loop structure of a plasma ignition system in a severe ship environment; based on the core idea of the control variable method, a grading cross interchange test flow aiming at an aviation plug interface and an igniter body is designed, and a complete decision tree model is constructed by comparing logic changes of ignition states before and after interchange, so that fault sources are accurately isolated from a control board card, an ignition cable or an igniter.

Inventors

ZOU FEI
MAO DONGYAN
YIN PENG
XU ZHAOCHUN
WU HAN
WANG YUNLONG
XU GUANGYE
WANG YAN
YAN CHANGSHENG
YANG JIAN
ZHANG ZHENYU
MA JIANLIN
WANG LIN
LI MUTIAN

Assignees

中国船舶集团有限公司第七〇三研究所

Dates

Publication Date: 20260508
Application Date: 20250929

Claims (8)

1. The method for checking the plasma ignition layering faults of the marine gas turbine is characterized by comprising the following steps of: S1, establishing a system, namely establishing a fault checking system, wherein the system comprises a high-voltage power pack, a first control board card, a second control board card, a first ignition cable, a second ignition cable, a first igniter, a second igniter and a safety testing and diagnosis auxiliary component; the diagnosis auxiliary component comprises an insulation test box body and a decision support module; s2, primary electric verification, namely using a voltage measuring device to measure whether the input power supply voltage of the high-voltage power supply package and the 24VDC ignition command signal voltage from the PLC control system are in a rated threshold range; s3, constructing a safety test environment and observing the phenomenon, namely detaching the first igniter and the second igniter from the combustion chamber of the gas turbine, installing the first igniter and the second igniter in a closed test box made of insulating materials, and transmitting an ignition instruction to a system, and observing and recording the ignition states of the two igniters through the observation windows; S4, performing layered fault diagnosis, namely implementing a differential investigation strategy according to the observation result of the step three; hierarchical fault diagnosis: S1.1, when the ignition states of two igniters are inconsistent, executing a single-path fault checking flow, wherein the flow comprises a grading test step based on interface exchange and device exchange, and locating fault points by analyzing a logic combination relation of a test result sequence; S1.2, when two igniters cannot strike fire successfully, executing a system-level fault checking flow, and mainly checking a high-voltage power pack, a public power supply and a system-level component of a control signal; In S1.1, when the two igniters are inconsistent in ignition state, and when the first igniter is ignited and the second igniter is not ignited, the following steps are eliminated: S1.1.1, board card function cross test, namely exchanging the aviation plug of the first ignition cable with the aviation plug of the second ignition cable on a high-voltage power pack interface of the plasma igniter box, and sending an ignition instruction again and observing: (1) When the ignition state is changed into the second igniter ignition state and the first igniter does not ignite, judging that the second control panel card fails; (2) When the ignition state is unchanged and the first igniter is still ignited and the second igniter is not ignited, judging that the second control board is normal in function, positioning a fault point on the second ignition cable or the second igniter, and executing the next step; s1.1.2, igniter cross test, namely exchanging the installation positions of the first igniter and the second igniter in the test box, restoring the aviation plug to the position before exchanging, and sending an ignition command again and observing: (1) When the ignition state is changed into the second igniter ignition state and the first igniter is not ignited, judging that the second igniter is in fault; (2) When the ignition state is unchanged and the first igniter is still ignited and the second igniter is not ignited, then a failure of the second ignition cable is determined.
2. The method for troubleshooting plasma ignition layering of the marine gas turbine according to claim 1, wherein the high-voltage power pack, the first control board card and the second control board card are all installed in a plasma igniter box, the ignition cable is connected with the plasma igniter box through an aviation plug, and a 24VDC ignition command signal controls high-voltage power output of the high-voltage power pack through the control board card.
3. The method for troubleshooting plasma ignition layering of marine gas turbine according to claim 1, wherein in S1.2, when two igniters cannot strike fire, a system-level troubleshooting process is executed, and the process comprises the following steps: s1.2.1, judging faults of a common path, namely using a high-voltage probe to measure whether a high-voltage power pack has high-voltage kilovolt output after receiving an ignition instruction, and specifically: (1) When no high-voltage output exists, judging that the high-voltage power pack fails; (2) When high voltage output exists, judging that the high voltage power pack is normal, the fault is originated from two independent loops, and executing the subsequent isolation verification step; s1.2.2, first loop verification, namely installing a first igniter in the insulation test box, ensuring that the second igniter and a cable thereof are completely disconnected with a high-voltage power supply pack, and sending an ignition instruction and observing, wherein the first loop verification comprises the following specific steps: (1) When the first igniter can strike a fire, judging that the first loop is normal in function, recording that the state of the first loop is normal, and the previous non-striking state of the first loop is caused by the fault of the second loop; (2) When the first igniter cannot strike fire, judging that the first loop has a real fault, and recording the state of the first loop as the fault; S1.2.3, verifying a second loop, namely installing a second igniter in the insulation test box, ensuring that the first igniter and a cable thereof are completely disconnected with a high-voltage power supply pack, and sending an ignition instruction and observing, wherein the specific steps are as follows: (1) When the second igniter can strike fire, judging that the second loop is normal in function, recording that the state of the second loop is normal, and the previous non-striking state of the second loop is caused by the first loop fault; (2) When the second igniter cannot strike fire, judging that the second loop has a real fault, and recording the state of the second loop as the fault; s1.2.4, comprehensively judging and disposing, specifically: (1) When the verification results of S1.2.2 first loop verification and S1.2.3 second loop verification indicate that only one loop has a fault, the step S1.1 is independently executed on the fault loop, and a specific fault point inside the fault loop is positioned; (2) When the verification results of S1.2.2 first loop verification and S1.2.3 second loop verification show that two loops have real faults, the two loops are judged to have multiple faults, the whole plasma igniter box assembly is replaced preferentially, and after replacement, the original igniter and the cable are reinstalled for test verification, specifically: (1) When the fault is removed after verification, the flow is ended; (2) And when the fault still exists, the step S1.1 of grading test is respectively carried out on the two loops, and the fault of the cable or the igniter is positioned.
4. The method for inspecting plasma ignition layering faults of the marine gas turbine according to claim 1 is characterized in that the insulation test box body is of a hexahedral structure and made of insulation materials, an interface for introducing an ignition cable is arranged on one surface of the insulation test box body, insulation sealing treatment is needed at the interface, and at least one surface of the insulation test box body is a transparent observation window for clearly observing the ignition state of the igniter and recording test results.
5. The method for troubleshooting plasma ignition layering of marine gas turbine according to claim 1, wherein the insulating material is polymethyl methacrylate or polycarbonate, the thickness of the insulating material of the insulating test box body is preferably 4.95-5.05 mm, and the size of the box body is (298-300 mm) x (19-200 mm) x (199-200 mm).
6. The method for plasma ignition layered fault investigation of a marine gas turbine according to claim 1, wherein the decision support module is responsible for receiving an ignition state observation result input by an operator, automatically analyzing a logic combination relation of a test result sequence through a built-in algorithm according to a preset hierarchical test step logic relation, outputting a fault locating conclusion in real time, assisting the operator to avoid an invalid investigation link, and rapidly locating a fault point.
7. The method for troubleshooting plasma ignition layering of the marine gas turbine according to claim 1, wherein the decision support module is realized through a software application program or a PLC+HMI system loaded on a tablet personal computer, a built-in logic rule base is constructed based on the grading test steps of the method, and an operator is supported to input an observation result through a graphical interface so as to generate a fault diagnosis report and an operation guide in real time.
8. The method for checking the plasma ignition layering faults of the marine gas turbine is characterized in that the voltage measuring device is a digital multimeter with the precision not lower than 0.5 level, the resolution is not lower than 0.1V when 220VAC is input to the power supply, the resolution is not lower than 0.01V when 24VDC ignition command signals are measured, the voltage measuring device is qualified through measurement and calibration periodically, the high-voltage probe is a high-voltage differential probe with the bandwidth not lower than 100MHz and the voltage measuring range covering 0-40kV, the oscilloscope with the sampling rate not lower than 1GS/s is required to be matched when the high-voltage power supply package is measured, the calibration period of the probe and the oscilloscope is not longer than 6 months, and the length of a probe grounding wire is not longer than 15cm during the measurement operation.

Description

Plasma ignition layering fault investigation method for marine gas turbine Technical Field The invention relates to the technical field of fault diagnosis of ship power devices, in particular to a plasma ignition layering fault investigation method of a ship gas turbine. Background The marine gas turbine is used as a core power device of a ship, and the starting reliability of the marine gas turbine has a decisive influence on the sailing safety. The plasma ignition system is a key subsystem for ensuring successful start of the gas turbine, and the working state of the plasma ignition system is directly related to the stability and success rate of the ignition process. However, the ship operation environment often has the characteristics of high temperature, high humidity, high salt fog and severe vibration, so that the electronic components and the high-voltage components in the plasma ignition system are more prone to aging, corrosion and connection faults, and further the system failure is caused. At present, after ignition failure, fault investigation of the system mainly depends on experience accumulation of maintenance personnel, and a 'trial and error method' is generally adopted for component replacement and test, so that a systematic and standardized analysis flow is lacked. The traditional method has the defects of low efficiency, long time for blind replacement of spare parts, delay of fault elimination and increase of safety risk especially under offshore conditions, poor accuracy, insufficient consistency of investigation results easily caused by excessive dependence on personal experience, high maintenance cost, increased operation and maintenance expense caused by frequent and invalid replacement of spare parts, potential safety hazard and possible injury to personnel if the spare parts are not operated properly in the igniter testing process. Therefore, in order to improve the reliability and maintenance guarantee efficiency of the marine gas turbine ignition system, a set of systematic, procedural, safe and efficient special fault investigation method is urgently needed to realize the rapid and accurate positioning of the faults of the plasma ignition system, thereby effectively guaranteeing the starting reliability of the marine power system. Disclosure of Invention (One) solving the technical problems Aiming at the defects of the prior art, the invention provides a plasma ignition layering fault investigation method for a marine gas turbine, which has the advantages of strong systematicness, clear logic, normal operation, high safety, high fault removal efficiency and low dependence on personnel experience, and solves the problems of low fault location efficiency, poor accuracy, high operation and maintenance cost and high operation risk of the traditional trial-and-error method. (II) technical scheme In order to achieve the purpose, the invention provides the technical scheme that the plasma ignition layering fault investigation method of the marine gas turbine comprises the following steps of: S1, establishing a system, namely establishing a fault checking system, wherein the system comprises a high-voltage power pack, a first control board card, a second control board card, a first ignition cable, a second ignition cable, a first igniter, a second igniter and a safety testing and diagnosis auxiliary component; s2, primary electric verification, namely using a voltage measuring device to measure whether the input power supply voltage of the high-voltage power supply package and the 24VDC ignition command signal voltage from the PLC control system are in a rated threshold range; s3, constructing a safety test environment and observing the phenomenon, namely detaching the first igniter and the second igniter from the combustion chamber of the gas turbine, installing the first igniter and the second igniter in a closed test box made of insulating materials, and transmitting an ignition instruction to a system, and observing and recording the ignition states of the two igniters through the observation windows; s4, performing layered fault diagnosis, and implementing a differential investigation strategy according to the observation result of the step three. The diagnosis auxiliary assembly comprises an insulation test box body and a decision support module, wherein the high-voltage power pack, the first control board card and the second control board card are all installed in the plasma igniter box, the ignition cable is connected with the plasma igniter box through an aviation plug, and a 24VDC ignition command signal controls high-voltage power output of the high-voltage power pack through the control board card. Further, the step S4 is a layered fault diagnosis: S1.1, when the ignition states of two igniters are inconsistent, executing a single-path fault checking flow, wherein the flow comprises a grading test step based on interface exchange and device exchange, and locating fault poin