Reboiler Circuits For Trayed Columns

The reboiler generally supplies most of the energy required to effect component separation. If too much heat is supplied, the tower may flood; conversely, if too little heat is available, separation performance may decrease via poor reflux ratio (pinching), excessive weeping or poor tray action. Pro...

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Bibliographic Details
Published in:Chemical Engineering 2011-01, Vol.118 (1), p.26-35
Main Author: Ondrey, Gerald
Format: Magazinearticle
Language:English
Subjects:
Boilers
Chemical engineering
Chemical process industries
Circuits
Decision making
Design
Design engineering
Exchange
Floods
Fluid dynamics
Hydraulics
Selection
Separation
Towers
Vacuum technology
Velocity
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Summary:The reboiler generally supplies most of the energy required to effect component separation. If too much heat is supplied, the tower may flood; conversely, if too little heat is available, separation performance may decrease via poor reflux ratio (pinching), excessive weeping or poor tray action. Proper design of reboiling systems involves coordinating aspects both outside and inside the tower. This article focuses on both of these aspects to ensure proper operation of the overall reboiler system. The design process begins by definition of the design basis and selection of the reboiler type that best suits the particular application. Selecting a reboiler type means determining the method of fluid circulation and selecting an exchanger type. These decisions need to be made before any tower bottom internals can be designed, since internals vary substantially for different reboiler types. The choices for flow type are once-through and recirculating; the choices for exchanger type are vertical and horizontal.
ISSN:0009-2460
1945-368X