Reboilers

Reboilers are designed in many configurations, including vertical tube side boiling thermosiphons, horizontal shell side boiling thermosiphons, submerged horizontal shell side boiling with internal natural circulation, and horizontal tube side boiling with pumped circulation. Vertical tube side boiling thermosiphons and submerged horizontal shell side boiling with internal natural circulation are the two most common configurations.

Vertical tube side boiling thermosiphons are normally designed using the HTRI RTF computer program. This is a mature program that rigorously simulates thermal and hydraulic performance and flags inappropriate operating conditions, including choked flow, mist flow, hydraulic resonance, and excessive subcooled boiling zones.

Horizontal shell side boiling is more efficient than vertical tube side thermosiphon boiling, but rigorous integrated thermal and hydraulic simulation methods are not currently available. Horizontal reboilers may be sized and thermally evaluated using the simple methods given later in this section, or with the HTRI RKH computer program. In either case, independent design/evaluation of the external circulation is required.


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