Reboiling issues in distillation columns
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Reboiling in a distillation column sometimes requires a pump while other times it doesn’t. Why is that? Generally, reboilers are powered by pumps, so isn’t steam also requires a pump? Why? I hope the experts here can give some guidance. Thank you
The thermosiphon effect occurs, and this force is actually quite strong.
A reboiler doesn’t need a pump either, right? I just graduated this year, and the reboilers in the fuel heating unit at our factory do have pumps as well. When the oil is heated, a density difference is created, which allows for circulation inside the reboiler, with fluid flowing in from below and out from above.
If the reboiler is a thermosyphon reboiler, no pump is required, as circulation can be established at the bottom of the tower through thermosyphon effect； If it is a kettle-type reboiler or a heating furnace, forced circulation is required
The tube leading into the furnace is referred to as forced circulation, and the pipelines are generally quite long.
A reboiler definitely requires forced circulation using a pump, while a reboiler does not; just look into the principle of thermosiphon and you’ll understand