Gas Turbine Control Device for Fuel Composition Variation
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Solution Overview
Problem
Conventional gas turbine control methods fail to adequately adjust for variations in fuel composition and aging of components, leading to instability and combustion oscillations due to fixed bias coefficients that do not account for changes in fuel calorific value and unit deterioration.
Innovation Solution
A gas turbine control device with a frequency analyzing unit, fuel characteristic estimating unit, state grasping unit, countermeasure determining unit, and outputting unit that performs frequency analysis, categorizes fuel characteristics, and adjusts fuel and air flow rates based on the current state of the gas turbine, using historical data to correct for changes in fuel composition and aging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed bias coefficient is used for fuel flow rate and air flow rate adjustment, then the control method is simple, but it cannot adequately adjust for variations in fuel composition and aging of components
Solution Approach 1:
The patent transforms the fixed bias coefficient into a dynamic, adjustable parameter. The control device now calculates and updates bias coefficients based on real-time fuel composition data and operational conditions, allowing the system to adapt to varying fuel qualities and component aging without requiring complete redesign of the control architecture.
Solution Approach 2:
The patent changes the parameters used for control adjustment from fixed predetermined values to dynamically calculated values based on fuel composition analysis. By measuring actual fuel properties (calorific value, density, viscosity) and using these measurements to adjust flow rate coefficients, the system achieves better adaptability while maintaining operational simplicity.
2Ease of operation
If predetermined flow rates are used for fuel and air, then the operation is straightforward, but combustion stability deteriorates due to deviation from actual conditions
Solution Approach 1:
The patent implements a feedback mechanism where actual fuel composition is measured and used to adjust control parameters. The system continuously monitors fuel properties (calorific value, density, viscosity) and feeds this information back to the control device, which then adjusts flow rate coefficients to maintain optimal combustion conditions, thereby preserving combustion stability while keeping operation straightforward.
Solution Approach 2:
The control system performs self-adjustment based on measured fuel properties. By automatically calculating appropriate bias coefficients from real-time fuel composition data without requiring manual intervention or complex operator judgment, the system maintains combustion stability while preserving ease of operation.
3Device complexity
If a unique bias coefficient is determined for fuel calorific value adjustment, then the control is simple, but sufficient adjustment cannot be performed when aging occurs
Solution Approach 1:
The patent makes the bias coefficients dynamic by linking them to real-time measurements of fuel composition and operational parameters. Instead of using a single fixed coefficient, the system calculates multiple coefficients (for fuel flow rate, air flow rate, and pilot fuel) based on current fuel properties and aging indicators, enabling the control structure to adapt to aging while maintaining relative simplicity.
Solution Approach 2:
The patent segments the control adjustment into multiple independent bias coefficients for different parameters (fuel flow rate, air flow rate, pilot fuel flow rate). This segmentation allows each coefficient to be optimized independently based on specific fuel composition variations and aging effects, improving oscillation suppression capability without significantly increasing overall control complexity.
4Device complexity
If fuel composition fluctuation is not compensated, then the control system is simple, but combustion stability is reduced due to composition variation
Solution Approach 1:
The patent implements feedback control by measuring fuel composition parameters (calorific value, density, viscosity) and using these measurements to adjust flow rate coefficients. This closed-loop approach compensates for fuel composition fluctuations automatically, maintaining combustion stability without requiring a fundamentally complex control system architecture.
Solution Approach 2:
The patent changes the control parameters from fixed predetermined values to dynamically adjusted values based on measured fuel composition. By calculating bias coefficients that reflect actual fuel properties, the system compensates for composition variations while keeping the control system relatively simple through automated parameter adjustment.
Data Source
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AI summary
An object of the present invention is to provide a gas turbine control device which is capable of performing correction on the basis of a fuel composition of fuel gas to be supplied to a gas turbine, and is capable of changing an amount of correction in response to variation with time of the gas turbine. To attain this, a frequency analyzing unit 25 performs a frequency analysis of combustion oscillation of a combustor and splits a result of the analysis into respective frequency bands. Then, a state grasping unit 22 checks an operating state of the gas turbine on the basis of the result of the analysis of the combustion oscillation and process value of the gas turbine, and corrects the checked operating state on the basis of a fuel composition or a heat capacity of fuel gas measured by a fuel characteristic measuring unit 200. A countermeasure determining unit 23 conducts a countermeasure for controlling an operating action of the gas turbine on the basis of the operating state thus checked.