Category: THERMOSIPHON REBOILER
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Is My Design OK? Thermosiphon Modeling in Xist
January 15, 2017
To help you better use Xist to model thermosiphon reboilers, this webinar begins with an overview of thermosiphon reboiler operations. Next, we discuss design rules-of-thumb and Xist input guidelines, including reboiler inputs and piping. The webinar concludes with helpful hints for interpreting results by focusing on troubleshooting error messages....
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TechTip: Service Type Defaults in Xist
January 15, 2017
Xist service types are improved and expanded in Xchanger Suite 7. During this webinar, we will discuss and demonstrate the default values provided for thermosiphon reboiler and reflux condenser service types....
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Research Update: Shellside Longitudinal Liquid-phase and Flow Boiling Heat Transfer for Vertical Plain Tube Bundles
January 19, 2017
Vertical shellside boiling is used for a variety of applications, including vertical thermosiphon reboilers where hot fluid must be on the tubeside steam generators/waste heat boilers, which use very hot or corrosive fluids as the heating medium vertical feed-effluent exchangers, whose vertical orientation prevents phase separation Ideal vertical shellside reboilers have...
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Research Update: Identifying Ledinegg instability in a VTTR
July 20, 2017
In a vertical tubeside thermosiphon reboiler (VTTR), Ledinegg instability can occur when the tubeside pressure drop decreases with increasing flow rate. Theoretical analysis of two boundary conditions—constant heat flux and constant steam pressure—revealed that for either condition, Ledinegg instability can occur in a VTTR only when intube frictional pressure drop dominates...
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Educational: Introduction to Thermosiphon Reboilers
August 21, 2018
Thermosiphon reboilers are often used to provide heat to industrial distillation columns. In this webinar, we will discuss different types of thermosiphon reboilers and some of their design challenges....
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Demystifying thermosiphon operation
June 05, 2019
Siddharth Talapatra, Group Lead, Research Engineers focused on the thermal and hydraulic aspects of heat exchangers sometimes forget that exchangers do not operate as standalone units. A thermosiphon reboiler is one application where understanding the flow loop around the heat exchanger is vital. Essential to refineries and chemical processing plants, a...
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BG1-18 Turndown Operation of a Vertical Tubeside Thermosiphon Reboiler
October 21, 2019
This report provides a comprehensive look at the turndown operation of a vertical tubeside thermosiphon reboiler (VTTR), including predictions of thermal and hydraulic performance and quantitative criteria for turndown limits. Data were collected for water, n-pentane, p-xylene, and n-pentane/p-xylene mixtures in an industrially relevant VTTR flow loop. The unit was systematically turned...
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BG1-19 Heat Transfer and Pressure Drop in Vertical Tubeside Thermosiphon Reboiler Under Turndown
June 10, 2020
This report summarizes HTRI data on vertical tubeside boiling, highlighting the shortcomings of current methods in accurately predicting tubeside pressure drop and heat transfer at low mass velocities. Improvements to the liquid holdup model and a warning message for thermal prediction close to turndown conditions are also discussed. When implemented in...
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Research Update: Guidelines for Vertical Tubeside Thermosiphon Reboiler Turndown
May 28, 2020
Thermosiphon reboilers often pose challenges for column operations in refineries and chemical processing plants. Some challenges are related to turndown, when reboiler circulation rates or duties are lower than design conditions. The process industry uses various checklists and criteria, though most guidelines have little to no validating data backing them up....
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