Split Hollow Desuperheater Seat Ring Thermal Stress
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Solution Overview
Problem
Existing desuperheaters face challenges in operating effectively at high temperature differentials, leading to thermal stress and increased maintenance costs, while maintaining performance and cost-effectiveness.
Innovation Solution
A desuperheater with a split hollow Seat-Ring design and a coolant nipple liner, allowing for flexible operation and reduced thermal stress through a variable orifice mechanism that injects coolant into superheated steam, creating a mixing chamber for efficient temperature reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional continuous seat ring is used in desuperheaters, then the structure is simple and manufacturing is easy, but thermal stress causes failure at high temperature differentials
Solution Approach 1:
The seat ring is divided into multiple segments with gaps between them, allowing each segment to expand and contract independently in response to temperature changes. This segmentation prevents thermal stress accumulation that would occur in a continuous ring, thereby improving reliability at high temperature differentials while maintaining manufacturing simplicity through modular construction
2Stability of the object's composition
If the seat ring is made rigid to maintain structural integrity, then manufacturing precision is improved, but thermal expansion causes distortion and failure
Solution Approach 1:
The seat ring segments are designed with flexible characteristics that allow them to expand and contract freely in response to thermal changes. The gaps between segments create a flexible structure that accommodates thermal expansion without causing distortion or failure, while maintaining sufficient structural integrity for proper function. This flexibility is achieved through the segmented design rather than through material softening
3Reliability
If a solid seat ring is used to ensure sealing, then manufacturing is simpler, but thermal stress concentrates and causes cracking
Solution Approach 1:
The seat ring is segmented into multiple sections with intentional gaps, which distributes thermal stress across the structure rather than concentrating it in a continuous solid ring. Each segment maintains sufficient sealing capability through its design, while the gaps prevent stress concentration that would lead to cracking. This segmentation approach simultaneously improves thermal stress strength and maintains sealing performance
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
The solution provides a robust and cost-effective desuperheater that effectively reduces superheat in steam while minimizing thermal stress and maintenance, maintaining performance and improving flexibility in high-temperature operations.
Implementation Method 1
a variable orifice mechanism that injects coolant into superheated steam
Implementation Method 2
creating a mixing chamber for efficient temperature reduction
Implementation Method 3
The opened slit design provides a high level of flexibility, which allows the seat ring to sustain severe temperature extremes by reducing thermal stress
Implementation Method 4
coolant injection at high temperature differential
Data Source
AI summary
The present invention relates to an apparatus and method of deploying a desuperheater with a Seat-Ring designed to provide coolant injection at high temperature differential. The present invention's robust design provides for a high level of flexibility that allows operating at high temperature differentials between the coolant and the superheated fluid. The desuperheater Seat-Ring is made as a split hollow ring with a perpendicular slit traversing the ring's circumference. The opened slit design provides a high level of flexibility, which allows the seat ring to sustain severe temperature extremes by reducing thermal stress. The coolant is supplied to the seat ring through a specially designed coolant nipple liner connected to the seat-ring.