Automated Fuel Blend Ratio Control for Gas Turbine Combustion Stability
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Solution Overview
Problem
Lean premixed combustion systems in gas turbines face challenges in maintaining stability and optimal operation due to variations in ambient conditions and fuel properties, leading to emission excursions and hardware damage from improper tuning, especially when using non-pipeline quality fuels.
Innovation Solution
An automated system that uses real-time data from sensors to adjust the fuel blend ratio and operational parameters, employing Boolean hierarchical logic to prioritize and address dominant tuning concerns, such as NOx emissions and combustor dynamics, through modifications in fuel distribution, temperature, and air ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If lean premixed combustion systems are used to reduce emissions, then NOx and CO emission levels are reduced to 1-3 ppm, but the operational envelope is substantially reduced and the systems require frequent adjustment when ambient conditions change
Solution Approach 1:
The patent implements an automated tuning system that continuously monitors operational parameters (exhaust gas temperature, pressure, flow rate) and provides real-time feedback to adjust fuel distribution and combustion conditions. This closed-loop feedback mechanism allows the system to maintain optimal performance across varying ambient conditions without manual intervention, thereby expanding the operational envelope while keeping emissions low.
Solution Approach 2:
The system dynamically adjusts fuel distribution ratios and combustion parameters based on real-time operational data. The automated tuning controller modifies fuel flow rates and distribution among multiple fuel injectors according to changing ambient conditions (temperature, humidity, pressure), enabling the combustion system to adapt continuously rather than operating at fixed settings, thus expanding the usable operational range.
2Object-generated harmful factors
If manual tuning is performed to optimize combustion settings, then emission levels can be controlled, but the system requires frequent readjustment when ambient conditions or fuel properties change
Solution Approach 1:
The automated tuning system continuously monitors exhaust gas temperature, pressure, and flow rate, comparing these parameters against target values. When deviations are detected, the system automatically adjusts fuel distribution and combustion settings without requiring manual intervention. This real-time feedback loop eliminates the time loss associated with periodic manual tuning while maintaining emission control.
Solution Approach 2:
The system performs self-tuning by automatically detecting operational parameter deviations and adjusting fuel distribution ratios and combustion settings without external intervention. The automated tuning controller calculates optimal adjustment amounts and implements changes autonomously, freeing operators from repetitive manual tuning tasks and eliminating the time associated with scheduling and executing manual tune-ups.
3Stability of the object's composition
If fuel distribution and injection settings are adjusted frequently to maintain optimal operation, then combustion stability is improved, but the complexity of system control increases
Solution Approach 1:
The fuel distribution system is segmented into multiple independently controllable fuel injectors, each with its own control valve. This segmentation allows the system to adjust fuel distribution ratios to specific zones within the combustion chamber, providing fine-grained control over combustion stability without requiring complex overall system redesign. Each injector can be tuned independently based on real-time feedback.
Solution Approach 2:
An automated tuning controller serves as an intermediary between sensors and actuators, processing operational data and calculating optimal adjustment commands. This intermediary layer simplifies the control architecture by centralizing the decision-making logic, automating the adjustment process, and providing a clear interface between monitoring and actuation functions, thereby managing complexity while maintaining combustion stability.
4Adaptability or versatility
If the operational envelope is expanded to accommodate varying ambient conditions, then system versatility is improved, but maintaining stable combustion becomes more difficult
Solution Approach 1:
The system employs dynamic adjustment of fuel distribution ratios and combustion parameters in response to changing ambient conditions. Rather than relying on fixed settings, the automated tuning controller continuously modifies fuel flow rates and distribution among injectors based on real-time measurements of temperature, pressure, and flow rate, enabling stable combustion across an expanded operational envelope.
Solution Approach 2:
The system changes key combustion parameters (fuel distribution ratio, fuel flow rate, air-fuel ratio) in response to varying ambient conditions. The automated tuning controller adjusts these parameters dynamically to maintain optimal combustion stability whether operating in cold or hot environments, at different altitudes, or with varying humidity levels, thereby expanding the operational envelope while preserving stability.
Data Source
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AI summary
Method for automated control of the gas turbine fuel composition through automated modification of the ratio of fuel gas from multiple sources. The method includes providing first and second fuel sources, sensing the operational parameters of a turbine, determining whether the operational parameters are within preset operational limits and adjusting the ratio of the first fuel source to the second fuel source, based on whether the operational parameters are within the preset operational limits.