Vertical Thermosyphon — The vertical thermosyphonreboiler shown in Fig. 1932 is usually a one tube passone shellpass exchanger with the channel end up. The upper tube sheetis placed close to the liquid level in the bottom of the fractionation column. This type exchanger is capable of high heat transfer rates (minimum area) and requires simple piping. It is noteasily fouled and has generally good controllability. Because ofthe vertical orientation, additional column skirt is required andmaintenance can be awkward
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