Gas Turbine Transition Piece Strut Fixation and Cooling
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Solution Overview
Problem
In gas turbine power plants, transition pieces experience deformation due to pressure differences and high temperatures, leading to thermal stress and difficulty in exchanging support struts, which affects efficiency and reliability.
Innovation Solution
The transition piece design features support struts with first and second insertion grooves for secure fixation without welding, allowing for easy exchange and incorporating cooling flow paths to manage thermal stress, including fins, pins, and axially through holes for enhanced cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If support struts are joined to the transition piece by welding, then the support strut is securely fixed, but large thermal stress is generated at the fixed portions causing breakage and the support strut cannot be easily disassembled
Solution Approach 1:
The support strut is divided into multiple sections with intermediate portions that can be independently positioned and fixed. This segmentation allows the strut to be fixed at multiple locations along its length, distributing thermal stress across multiple fixation points rather than concentrating it at single welded joints, thereby reducing the risk of breakage while maintaining secure fixation.
Solution Approach 2:
An intermediary fixation mechanism is introduced between the support strut and the transition piece, replacing direct welding. This intermediary system allows for adjustable positioning and fixation without the thermal stress concentration inherent in welding, enabling both secure fixation and ease of disassembly for maintenance or replacement.
2Strength
If support struts are joined by welding, then the support strut is securely fixed, but the support strut cannot be easily disassembled making exchange difficult
Solution Approach 1:
The fixation system is made dynamic and adjustable rather than permanent through welding. The support strut can be positioned at different locations along the transition piece and fixed at multiple intermediate portions, allowing for easy repositioning, disassembly, and exchange without the constraints of welded joints. This dynamic fixation mechanism maintains secure attachment while enabling straightforward maintenance operations.
3Productivity
If the transition piece operates continuously at high temperature, then power generation efficiency is maintained, but creep deformation occurs making the inner diameter smaller and causing damage
Solution Approach 1:
The support strut is segmented into multiple portions that can be independently fixed at different locations along the transition piece. This segmentation allows for better distribution of mechanical and thermal loads, reducing stress concentration points that would otherwise accelerate creep deformation. The multiple fixation points provide redundant support structures that can accommodate thermal expansion and contraction more effectively.
Solution Approach 2:
The fixation parameters are made adjustable, allowing optimization of the support strut positioning and fixation strength based on operating conditions. This enables adaptation to thermal cycling and continuous high-temperature operation, preventing creep deformation by adjusting fixation characteristics to match the thermal and mechanical environment while maintaining power generation 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 design effectively suppresses thermal stress and facilitates easy strut replacement, preventing deformation and maintaining efficiency by using non-welded fixation and enhanced cooling mechanisms.
Implementation Method 1
a cooling flow path P70 through which a cooling medium CA flows is formed in the support strut 70
Implementation Method 2
fins 721 and pins 722 are provided on an inner peripheral surface of the support strut 70
Data Source
AI summary
A transition piece of an embodiment leads a combustion gas generated by a combustor liner to a turbine part in a gas turbine facility. An outlet portion from which the combustion gas flows out to the turbine part in the transition piece includes: an inner peripheral wall located inside in a radial direction of the turbine part; an outer peripheral wall located further outside than the inner peripheral wall in the radial direction; and support struts provided between the inner peripheral wall and the outer peripheral wall. In the inner peripheral wall, first insertion grooves are formed. In the outer peripheral wall, second insertion grooves are formed. In the support struts, first end portions located inside in the radial direction are inserted into and fixed in the first insertion grooves, and second end portions located outside in the radial direction are inserted into and fixed in the second insertion grooves.