Gas Turbine Disk Cavity Cooling Valve Control
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Solution Overview
Problem
The existing gas turbine control systems face complexity in maintaining appropriate air temperature within the disk cavity during load transitions, leading to frequent opening and closing of the flow rate control valve, which complicates control and can result in temperature instability.
Innovation Solution
A gas turbine system with a control device that uses two distinct valve opening degree setting values, a first and a second, based on ambient temperature measurements, to adjust the opening/closing valve in the cooling air supply passage, allowing for stable temperature control without rapid valve operation. The control device switches between these settings based on predetermined temperature thresholds and load conditions to manage temperature changes effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If PI-control is used to adjust the flow rate control valve opening degree based on air temperature inside the disk cavity, then the air temperature can be controlled, but the valve opens and closes frequently in short time making control complex
Solution Approach 1:
The invention changes the control parameter from continuous PI-control to discrete valve opening degree settings. By defining specific valve opening degrees corresponding to different air temperature ranges, the system avoids frequent valve operations while maintaining effective temperature control. The control device selects appropriate valve opening degrees based on current air temperature and load conditions, simplifying the control logic.
Solution Approach 2:
The invention implements dynamic control by adjusting valve opening degrees according to operating conditions. The control device determines appropriate valve settings based on real-time air temperature measurements and load conditions, allowing the system to adapt to changing operational states without requiring continuous valve adjustment, thereby reducing control complexity.
2Measurement precision
If the flow rate control valve is adjusted frequently to maintain air temperature, then temperature control precision is improved, but the control system becomes complex and valve durability decreases
Solution Approach 1:
The invention transforms the control approach from frequent continuous adjustments to selective discrete adjustments. By establishing a relationship between air temperature ranges and specific valve opening degrees, the system achieves effective temperature control with fewer valve operations, thereby improving valve reliability while maintaining control precision through the structured parameter selection.
3Temperature
If cooling air flow is increased to lower disk cavity temperature, then temperature control is achieved, but the system requires complex valve adjustment mechanisms
Solution Approach 1:
The invention simplifies the valve adjustment mechanism by defining predetermined opening degrees corresponding to different cooling requirements. Instead of using complex continuous control mechanisms, the system selects from a set of discrete valve opening positions based on temperature measurements and load conditions, achieving effective temperature control with a simpler mechanical implementation.
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 simplifies control by stabilizing air temperature within the disk cavity, preventing abrupt changes and ensuring continuous operation by promptly adjusting cooling air flow according to temperature and load conditions, thus enhancing precision and reducing the risk of damage to the gas turbine.
Implementation Method 1
a compressor (11) which compresses air
Implementation Method 2
a combustor (12) which burns a mixture of a fuel and the air compressed by the compressor (11)
Implementation Method 3
a turbine (13) which obtains rotational power by a combustion gas generated by the combustor (12)
Implementation Method 4
a cooling air supply passage (41) which supplies air bled from the compressor (11) to a disk cavity (31) of the turbine (13)
Data Source
AI summary
A gas turbine includes a cooling air supply passage which supplies compressed air bled from a compressor to a disk cavity of a turbine, a cooler side valve in the cooling air supply passage, a temperature measurement unit which measures ambient temperature of the disk cavity, and a control device which adjusts an opening degree of the cooler side valve based on the ambient temperature measured by the temperature measurement unit. The control device includes a first valve opening degree setting value and a second valve opening degree setting value larger than the first valve opening degree setting value of the cooler side valve, the first valve opening degree setting value is used when the ambient temperature is lower than a predetermined switching temperature, and the second valve opening degree setting value is used when the ambient temperature is higher than the switching temperature.