Heat Exchanger Header Support for Thin Tubesheet Pressure Loads
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Solution Overview
Problem
Existing shell and tube heat exchangers face challenges with high pressure resistance requirements leading to thick tubesheets that experience significant thermal stresses and mechanical fatigue, limiting their efficiency and increasing manufacturing and handling costs.
Innovation Solution
A header arrangement with a structural connection element that supports the tubesheet, allowing it to be dimensioned thinner while redistributing pressure, reducing thermal stresses, and enhancing structural support, thereby improving pressure distribution and fatigue resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the tubesheet is dimensioned with high thickness to compensate for high pressure, then the pressure resistance is improved, but the thermal stresses and mechanical fatigue increase
Solution Approach 1:
The tubesheet is segmented into multiple regions with through holes that act as stress relief features. These through holes divide the continuous structure into segments that can better accommodate thermal expansion and pressure variations, reducing overall thermal stress while maintaining pressure resistance.
Solution Approach 2:
The tubesheet employs non-uniform thickness distribution where the thickness varies across different regions. Thicker regions provide enhanced pressure resistance where needed, while thinner regions reduce thermal stress accumulation. This local variation in quality allows optimization of both pressure resistance and thermal stress resistance simultaneously.
2Strength
If the tubesheet is dimensioned with high thickness to compensate for high pressure, then the pressure resistance is improved, but the manufacturing and handling costs increase
Solution Approach 1:
The invention changes the thickness parameter of the tubesheet from uniform high thickness to variable thickness with specific patterns. This parameter change allows the tubesheet to achieve required pressure resistance through strategic thickening while reducing overall material usage and manufacturing cost through localized thinning.
3Strength
If the tubesheet is dimensioned with high thickness to compensate for high pressure, then the pressure resistance is improved, but the heat exchange efficiency decreases
Solution Approach 1:
The through holes in the tubesheet create segmented flow paths that improve heat exchange efficiency. These openings allow better fluid distribution and contact with tube surfaces, enhancing heat transfer while the variable thickness maintains pressure resistance.
Solution Approach 2:
The variable thickness distribution is optimized to provide thicker sections for pressure resistance in specific areas while maintaining thinner sections that facilitate better heat exchange. This local quality variation allows simultaneous optimization of both structural integrity and heat transfer performance.
Data Source
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AI summary
The present invention provides a header arrangement for a heat exchanger, in particular for a shell and tube heat exchanger, comprising: a sheet, in particular tubesheet, a cover, in particular head cover, configured to be arranged abutting a first side of the sheet and fluidly seal said first side to form a chamber, a structural connection element configured to be connected to the cover and extend through the chamber to structurally support the sheet. Furthermore, the invention provides a method of assembling a header arrangement for a heat exchanger and a heat exchanger.