Acoustic Combustor Damage Detection via Center Frequency Analysis
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Solution Overview
Problem
Combined-cycle power plants face challenges in evaluating and optimizing performance due to environmental and operational factors, and specific issues with combustor hardware can lead to damage, inefficiencies, or blowouts in gas turbine combustion systems.
Innovation Solution
A method and system that sense acoustic vibrations from combustor cans, determine center frequencies, and activate an alarm when a change is detected compared to a representative frequency, providing early warning and enabling corrective action to prevent hardware damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional monitoring methods are used for combustor hardware, then the system structure remains simple, but damage detection capability is insufficient and cannot provide early warning
Solution Approach 1:
The patent replaces traditional mechanical monitoring methods with acoustic field-based detection. Acoustic sensors monitor combustion acoustic signals, and signal processing techniques extract features to detect hardware damage, substituting mechanical measurement approaches with acoustic field analysis to achieve early damage detection without complex mechanical intervention systems
Solution Approach 2:
The patent introduces acoustic signals as an intermediary medium to detect hardware damage. Instead of directly monitoring mechanical parameters, the system uses acoustic sensors to capture combustion acoustic signals, which serve as intermediaries carrying information about hardware condition, enabling indirect but effective damage detection
2Reliability
If no real-time monitoring is implemented, then the system operation remains uninterrupted, but hardware damage cannot be detected until severe failure occurs
Solution Approach 1:
The patent implements preliminary detection by continuously monitoring acoustic signals during normal operation to identify early signs of hardware damage. The system performs preliminary assessments of hardware condition through acoustic feature analysis, enabling preventive maintenance before severe failures occur, thus protecting reliability without requiring shutdowns
Solution Approach 2:
The patent establishes a feedback mechanism where acoustic sensor data is continuously processed and analyzed to provide real-time information about hardware condition. This feedback loop enables the system to detect damage trends, alert operators, and trigger maintenance actions while maintaining operational continuity, balancing reliability protection with productivity
3Measurement precision
If detailed acoustic analysis is performed on each combustor can, then detection accuracy improves, but data processing complexity and time increase
Solution Approach 1:
The patent extracts only the critical center frequency parameter from the full acoustic spectrum for each combustor can. Instead of analyzing all frequency components, the system identifies and monitors the dominant center frequency of combustion acoustic signals, which suffices for damage detection while dramatically reducing data processing requirements and time
Solution Approach 2:
The patent focuses analysis on specific local characteristics of the acoustic signal rather than the entire spectrum. By concentrating on the center frequency parameter and its temporal variations, the system achieves high detection accuracy for hardware damage while minimizing processing complexity, applying local quality analysis to the most informative aspect of the acoustic signal
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides advanced warning of combustor hardware damage, allowing for timely corrective action to prevent significant damage and optimize power plant performance by monitoring temperature changes and adjusting fuel split to prevent lean blowouts.
Implementation Method 1
sensing acoustic vibrations of a plurality of combustor cans
Data Source
AI summary
A method for determining when a combustor is experiencing hardware damage includes sensing acoustic vibrations of a plurality of combustor cans, determining a center frequency for each acoustic tone of the sensed acoustic vibrations within a predetermined frequency range, and indicating an alarm when a center frequency of one or more of the combustor cans changes in a different manner compared to a representative center frequency of the plurality of combustor cans.