Static Mixer for Gas Turbine Exhaust Leakage Detection
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Solution Overview
Problem
Hazardous gas detection systems in gas turbine compartments face challenges due to stratified gas concentrations and temperatures in exhaust air, leading to potential false alarms and unnecessary shutdowns, as sensors may not accurately detect fuel gas leakage or temperature variations.
Innovation Solution
A hazardous gas detection system that includes static mixers positioned upstream of sensors within the exhaust duct to promote uniform mixing of exhaust air, ensuring reliable detection of hazardous gas concentrations and temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensors are positioned in the exhaust duct to detect hazardous gas concentrations, then gas leakage detection capability is improved, but measurement precision deteriorates due to stratified gas concentrations
Solution Approach 1:
A static mixer is installed upstream of the sensors in the exhaust duct to pre-mix the exhaust air stream before it reaches the sensing location. This preliminary mixing action ensures that hazardous gas concentrations are uniformly distributed throughout the exhaust stream, allowing sensors to accurately measure representative concentrations regardless of where the leakage occurs within the gas turbine compartment.
2Reliability
If sensors are positioned to detect hazardous gases in the exhaust duct, then detection coverage is improved, but false alarms increase due to non-uniform gas distribution
Solution Approach 1:
The static mixer performs preliminary mixing of the exhaust air stream upstream of the sensors, ensuring uniform distribution of hazardous gases throughout the exhaust flow. This eliminates localized concentration variations that would cause sensors to register false high or low readings, thereby reducing false alarms while maintaining comprehensive detection coverage.
3Device complexity
If no mixing device is installed in the exhaust duct, then device complexity is reduced, but sensor reading accuracy deteriorates due to temperature variations
Solution Approach 1:
The static mixer is positioned upstream of temperature sensors to pre-mix the exhaust air stream and eliminate temperature stratification before measurements are taken. This preliminary thermal mixing ensures that temperature readings accurately represent the overall exhaust conditions rather than localized hot or cold spots, improving measurement precision without adding complex active mixing systems.
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 more accurate and reliable sensor readings by achieving uniform gas concentrations and temperatures, reducing false alarms and unnecessary shutdowns, thereby enhancing the operational reliability and availability of gas turbine engines.
Implementation Method 1
a static mixer positioned upstream of the one or more sensors to promote mixing of the flow of exhaust air
Data Source
AI summary
The present application provides a hazardous gas detection system to determine hazardous gas concentrations and/or temperatures within a flow of exhaust air in an exhaust duct of a gas turbine compartment. The hazardous gas detection system may include one or more sensors positioned within or in communication with the exhaust duct and a static mixer positioned upstream of the one or more sensors to promote mixing of the flow of exhaust air.