Gas Turbine Inlet Guide Vane Control for Part Load Temperature Management
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Solution Overview
Problem
Existing gas turbine control devices face challenges in efficiently adjusting turbine inlet and flue gas temperatures during load variations, particularly at part load operations, leading to high fuel-air ratios and limitations in output adjustments, which can result in reduced performance and load falls due to excessive temperature limitations.
Innovation Solution
A control device with an adjustable inlet guide vane that sets its degree of opening based on the output request value, rather than actual output, to manage fuel supply and air suction, maintaining lower fuel-air ratios and allowing for smoother load adjustments along the temperature adjustment line, thereby optimizing performance during part load operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the degree of opening of the inlet guide vane is set on the basis of the gas turbine output (actual output), then the control is simple and responsive to actual conditions, but at the time of load increase the fuel-air ratio remains at high levels causing the turbine inlet temperature and flue gas temperature to remain at high levels which limits output adjustment
Solution Approach 1:
The patent applies preliminary action by setting the inlet guide vane degree of opening based on the output request value (target value) in advance, before the actual output is achieved. This allows the air supply to be adjusted proactively before fuel injection increases, preventing the fuel-air ratio from becoming excessively high and avoiding temperature limitations that would constrain output adjustment capability.
2Power
If the supply amount of the fuel is increased to increase the gas turbine output, then the output increases, but the fuel-air ratio remains at high levels causing the turbine inlet temperature and flue gas temperature to remain at high levels
Solution Approach 1:
The patent applies preliminary action by adjusting the inlet guide vane degree of opening based on the output request value before increasing fuel supply. This proactive air supply adjustment ensures that when fuel is increased to boost power output, the air-fuel mixture remains balanced, preventing excessive flue gas temperature rise while still achieving the desired power increase.
3Temperature
If the temperature adjustment control is executed so that the flue gas temperature becomes around the temperature adjustment line, then the upper limit temperature is maintained, but the suction amount of the air is decreased due to disturbance such as load variation causing the flue gas temperature to rise and load fall to occur
Solution Approach 1:
The patent applies feedback by continuously monitoring the relationship between the inlet guide vane degree of opening (set based on output request value) and the actual flue gas temperature. When load variations cause the flue gas temperature to approach the temperature adjustment line, the system adjusts the inlet guide vane opening accordingly to maintain temperature within limits while preventing load fall, thus improving load stability.
4Temperature
If the degree of opening of the inlet guide vane is made large to increase air supply, then the fuel-air ratio decreases and temperature control improves, but the air-suction amount increases which may affect system efficiency
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the inlet guide vane degree of opening based on the output request value and actual operating conditions. This optimized parameter adjustment achieves the minimum necessary air supply increase to maintain appropriate fuel-air ratio and temperature control, avoiding excessive air suction that would cause energy losses, thus balancing temperature control precision with energy efficiency.
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 approach enables the gas turbine to maintain rated performance during part load operations by controlling the inlet guide vane opening in advance of fuel supply increases, suppressing temperature rises and preventing output limitations, allowing for efficient load adjustments without exceeding the upper limit temperature.
Implementation Method 1
an inlet guide vane capable of adjusting the degree of opening and provided on an air-suction side
Implementation Method 2
a compressor that compresses suctioned air to obtain compressed air
Implementation Method 3
a combustor that supplies fuel to the compressed air to burn the fuel and the compressed air to generate combustion gas
Implementation Method 4
a turbine that is operated by the generated combustion gas to rotate a rotor
Data Source
AI summary
A control device is configured to control a gas turbine that is configured to compress a suctioned air with a compressor to obtain compressed air, mix a fuel supplied from a combustor with the compressed air to burn the fuel and the compressed air to generate a combustion gas, operate a turbine with the combustion gas to rotate a rotor, and discharge the combustion gas that has operated the turbine as a flue gas. The compressor includes an inlet guide vane which is capable of adjusting a degree of opening and is on an air-suction side, and the control device is configured to execute temperature adjustment control to control the degree of opening of the inlet guide vane along a temperature adjustment line indicating an upper limit temperature of a flue gas temperature defined according to a load of the gas turbine.