End structure of heat exchange tubes in a reboiler heat exchanger
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The client requires a reboiler with this type of tube-end structure (negative pressure inside the vessel; microphenol substituted phenol at 150°C; steam in the tube side at a working temperature of 165°C and a working pressure of 0.65 MPa). The tube bundle can slide and be removed, and the tube ends do not follow the GB/T151 design standard – there are no U-tubes or flange connections; instead, the end caps are directly welded to the tube sheet. I think this is acceptable. The heat exchange tube ends are not subjected to axial forces but only to the pressure from the tube side; as long as the strength calculations are satisfactory, is this feasible? Please discuss and provide guidance
Is the head welded directly to the tube sheet, which is then bolted to the flange? The structure is not visible in the image.
Simplified floating-head heat exchanger? What to do if there is a leak in the weld of the heat exchange tubes on the right tube sheet (during pressure testing and operation)? A leak in a weld means the head has to be discarded.
Yes, it’s just not convenient for maintenance; I think the structural strength is fine though
I am extremely grateful to the teacher for sharing the materials.
Could the original poster explain what the purpose of this design is? Is it to allow cleaning inside the pipe?
The structure has been changed to a regular format; thanks to everyone for their support!
This can only be used as a component, and you must design it according to standard 151; both 151 and 150 are tolerance standards that must be followed. It’s actually just a device that heats up quickly, but I’m not sure what the reasoning was behind producing it as a separate pressure vessel.
Although boilers, pressure vessels, and pressure pipelines overlap in some special cases, in most situations the distinctions between them are quite clear. This heat-up fast version makes more sense as a component; it is clearly derived from the tube side of a heat exchanger and does not constitute a complete device.