Hanging Steam Generator Coupling Strip Load Transfer
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Solution Overview
Problem
Existing steam generators face challenges in efficiently transferring loads from inclined tube walls to vertical tube walls without causing alternating stresses and requiring extensive construction and welding efforts, leading to increased costs and weight.
Innovation Solution
A steam generator design featuring a coupling strip with vertical and inclined tube angles that distributes the load from the inclined tube wall to the vertical tube wall, eliminating the need for external tension or support elements, and incorporating a thermal expansion joint to manage thermal expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If external tension or support elements are used to support the lower part of the steam generator, then the load is transferred from the inclined tube wall to the vertical tube wall, but the construction and welding effort increases significantly
Solution Approach 1:
The coupling band merges the functions of load transfer, structural connection, and thermal expansion accommodation into a single integrated component. It combines vertical tube angles, inclined tube angles, and thermal expansion joints in one element that directly connects the inclined tube wall to the vertical tube wall without requiring separate external tension elements or support structures.
Solution Approach 2:
The coupling band serves multiple functions simultaneously: it transfers loads from the inclined tube wall to the vertical tube wall, provides structural support, accommodates thermal expansion through integrated expansion joints, and eliminates the need for separate external support elements. This multi-functionality reduces the overall number of components and simplifies construction.
2Strength
If external tension or support elements are welded to the inclined tube wall, then load transfer is achieved, but alternating stresses arise from lag between tension elements and membrane tube wall during load changes
Solution Approach 1:
The coupling band merges the load transfer function with the structural connection to the tube walls, creating a rigid integrated assembly that moves together during thermal expansion and load changes. This eliminates the relative movement and lag between separate tension elements and the membrane tube wall, preventing alternating stresses.
Solution Approach 2:
The coupling band acts as an intermediary structure that rigidly connects the inclined tube wall to the vertical tube wall through integrated tube angles. This intermediary ensures synchronized movement during thermal expansion and load changes, eliminating the lag that causes alternating stresses while maintaining effective load transfer.
3Strength
If numerous connections of tension elements with the inclined tube wall are made, then load transfer is achieved, but the construction effort and welding work increase considerably
Solution Approach 1:
The coupling band merges multiple connection functions into a single integrated structure with vertical tube angles and inclined tube angles that are formed as one piece. This eliminates the need for numerous separate connections and welds, reducing construction effort while maintaining load transfer capability.
Solution Approach 2:
The coupling band is segmented into functional sections (vertical tube angles, inclined tube angles, thermal expansion joints) that are integrated into one component. This segmentation allows for optimized load distribution across multiple attachment points while maintaining a single unified structure that reduces overall welding effort compared to separate external elements.
4Strength
If the lower part of the steam generator is supported on additional external tension or support elements, then the load is transferred to the vertical tube wall, but the weight of the steam generator increases
Solution Approach 1:
The coupling band merges the support function with the existing tube wall structure, using the vertical and inclined tube angles as integral parts of the connection. This eliminates the need for additional external support elements and their associated weight, while maintaining full load transfer capability to the vertical tube wall.
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 significantly reduces construction costs and weight by evenly distributing the load, minimizing stress peaks, and allowing for easier assembly with reduced welding effort, while avoiding alternating stresses and thermal damage.
Implementation Method 1
Outside the vertical leg of the vertical tube angle, a thermal expansion joint is formed between the coupling strip and the vertical tube wall
Implementation Method 2
The coupling strip is welded below the inclined legs of the inclined tube connection angles along the inclined legs to the respective adjoining inclined web or the underlying inclined tube end section
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The coupling strips are made to accept welding of vertical limbs of vertical tube extending from vertical tube wall (2) to inclined tube wall (6). The coupling strip is formed along the upper edge of the inclined tube wall. The coupling strips supports the suspension of steam boiler lower portion (5) to the steam boiler upper portion (1). The steam boiler lower portion is suspended from the vertical tube wall by welding the vertical limbs of the coupling strip to the vertical tubes of the vertical tube wall, without needing additional external tensile or support elements.