Two-Shaft Gas Turbine Control for Compressor Efficiency
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Solution Overview
Problem
Two-shaft gas turbines experience reduced efficiency and reliability due to increased driving force for the compressor during high atmospheric temperatures, leading to power output reduction and potential corrosion and rust issues from water droplet accumulation, especially when operating at part-load conditions.
Innovation Solution
A control system that adjusts the intake air spray and rotational speed of the high-pressure turbine based on the aperture of the inlet guide vane, using a controller with tachometer and aperture detector to optimize fuel flow, spray flow rate, and vane aperture for improved compressor efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If water droplets are sprayed into the compressor intake air to increase power output, then the power output increases, but droplet accumulation causes corrosion and rust issues
Solution Approach 1:
The patent changes the operational parameters by controlling the inlet guide vane aperture and adjusting the spray amount based on detected aperture values. This dynamic parameter adjustment optimizes the balance between power output enhancement through water spraying and preventing excessive droplet accumulation that causes corrosion
Solution Approach 2:
The patent implements a feedback control system where the aperture detector continuously monitors the inlet guide vane aperture, and the controller adjusts the spray amount accordingly. This closed-loop feedback mechanism ensures that water spraying is optimized for power output while preventing harmful droplet accumulation
2Force
If the inlet guide vane aperture is reduced to balance power output during high atmospheric temperatures, then the driving force for the compressor is reduced, but droplet accumulation increases due to closed vane operation
Solution Approach 1:
The patent applies dynamic control by continuously adjusting the spray amount based on the real-time aperture detector readings. When the inlet guide vane is more closed, the system dynamically reduces spray amount to prevent droplet accumulation, while maintaining appropriate cooling effect
Solution Approach 2:
The controller changes the spray parameter (amount) based on the aperture parameter. This coordinated parameter adjustment ensures that spray quantity is optimized for each operating condition, preventing droplet accumulation when vanes are closed while maintaining compressor cooling
3Productivity
If the high-pressure turbine rotates at high speed to drive the compressor, then the compressor efficiency is improved, but the power output of the high-pressure turbine becomes excessive relative to compressor drive power
Solution Approach 1:
The patent uses feedback control where the controller monitors turbine rotation and adjusts the inlet guide vane aperture to balance power output with compressor drive requirements. This feedback mechanism prevents excessive turbine power while maintaining efficient compressor operation
Solution Approach 2:
The system adjusts the inlet guide vane aperture parameter to control the balance between turbine power output and compressor drive power. By changing this parameter, the system optimizes the match between high-pressure turbine power and compressor requirements
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
This solution reduces the driving force for the compressor, minimizes droplet accumulation, and enhances the efficiency and reliability of the two-shaft gas turbine by balancing power output and compressor efficiency.
Implementation Method 1
the minute droplets carried into the compressor along with flowing air evaporate up to the saturation temperature of the stage while passing through the rows of rotor blades and the rows of stator vanes, and its latent heat of evaporation lowers the temperature of working fluid
Implementation Method 2
its latent heat of evaporation lowers the temperature of working fluid
Data Source
AI summary
A two-shaft gas turbine control system and method are provided that can enhance the efficiency and reliability thereof by controlling the amount of intake air spray and the rotational speed of a high-pressure turbine in accordance with the aperture of an inlet guide vane in a state where a two-shaft gas turbine is being operated with the efficiency of its compressor reduced.The control system includes a droplet spray device for spraying droplets to intake air for the compressor and a controller. The controller includes a fuel control section for adjusting a flow rate of the fuel to be supplied to the combustor, a spray flow rate control section for adjusting a flow rate of spray water to be supplied to the droplet spray device, an inlet guide vane aperture control section for adjusting the aperture of the inlet guide vane, and an efficiency improvement control section for outputting a command signal for bringing a balance between driving force for the compressor and power output of the high-pressure turbine to the fuel control section, the spray flow rate control section and the inlet guide aperture control section. In response to the commands from the improvement control section, the controller reduces the rotational speed of the high-pressure turbine and controls the inlet guide vane so as to be more open, thereby appropriately controlling the flow rate of the spray water.