Gas Turbine Combustor Fuel Split Control
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Solution Overview
Problem
Gas turbine systems face challenges in maintaining emission compliance during part-load operation due to inadequate control of fuel splits, leading to excessive production of harmful emissions like CO and NOx, especially when switching from automatic tuning to fixed fuel split schedules.
Innovation Solution
A controller is programmed to switch from automatic tuning to an adjusted fixed fuel split schedule by determining a biasing value based on the difference between the latest automatic tuned fuel split and the fixed fuel split schedule, allowing for more robust combustion operability by adjusting the fixed fuel split schedule.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If automatic tuning is used to control fuel split, then emissions compliance is improved, but system complexity and control difficulty increase
Solution Approach 1:
The patent introduces an intermediary fixed fuel split schedule that mediates between the complex automatic tuning system and the simple fixed schedule. The controller switches to this intermediate fixed schedule when automatic tuning is unavailable, providing a simplified control mechanism that maintains emissions compliance without requiring the full complexity of automatic tuning algorithms.
Solution Approach 2:
The patent pre-calculates and stores optimal fuel split values in a fixed fuel split schedule during system design or commissioning. These pre-determined values are based on anticipated operating conditions and emissions requirements, allowing the system to quickly switch to compliant operation without real-time computation when automatic tuning is unavailable.
2Ease of operation
If fixed fuel split schedule is used, then control simplicity is improved, but emissions compliance and combustion performance deteriorate
Solution Approach 1:
The patent modifies the fixed fuel split schedule parameters to incorporate emissions compliance requirements. By adjusting the fuel split values in the fixed schedule based on emissions data from automatic tuning operations, the system maintains simplicity while improving emissions performance to meet regulatory standards.
Solution Approach 2:
The patent implements feedback mechanisms where emissions data and combustion performance metrics from automatic tuning operations are used to refine and update the fixed fuel split schedule. This feedback loop allows the simplified fixed schedule to progressively improve emissions compliance while maintaining operational simplicity.
3Reliability
If automatic tuning is switched to fixed fuel split schedule, then control reliability is improved, but combustion dynamics and stability margin worsen
Solution Approach 1:
The patent creates a dynamic switching mechanism between automatic tuning and fixed fuel split schedule based on system conditions. The controller monitors operational parameters and automatically switches between control modes, allowing the system to maintain reliability through the robust fixed schedule while preserving combustion dynamics through automatic tuning when conditions permit.
Data Source
AI summary
A non-transitory computer readable storage medium storing one or more processor-executable instructions wherein the one or more instructions when executed by a processor of a controller, cause acts to be performed is provided. The acts to be performed include controlling a fuel split to a combustor of a gas turbine utilizing automatic tuning and switching control of the fuel split to the combustor of the gas turbine to utilizing an adjusted fixed fuel split schedule instead of automatic tuning. The adjusted fixed fuel split schedule includes a fixed fuel split schedule adjusted via a biasing value, and the biasing value is based on both the fixed fuel split schedule and an automatic tuning based fuel split.