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Kettle Reboiler Design


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#1 venkyravula

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Posted 27 September 2017 - 02:52 AM

Hi all, 

 

Does anyone have any experience handling hydrocarbons in a hx near (below) the critical point.  The fluid conditions (85F, 650 psig) is near the critical point (715 psig, 93F)

 

 

Q1: As the densities of the fluid are close 17.7 lb/ft3 (liquid), 7 lb/ft3 (gas), surface tension of .5 dyne/cm, will there be a clear separation between the two phases.

 

Q2: Will high froth/foaming be expected. What would you recommend for the froth height for HTRI.

 

Q3: I looked at sizing a meshpad but the density difference was so close the size was not reasonable.

 

Thank you


Edited by venkyravula, 27 September 2017 - 03:32 AM.


#2 Bobby Strain

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Posted 27 September 2017 - 09:14 AM

You should first ascertain that what you describe as the critical point is not the pseudo-critical point. There can be a large difference. Since you refer to the exchanger as a reboiler, is this associated with a fractionator? Tell us more about the application, including the fluid composition. I expect, though, that you will have to look for a solution other than a kettle.

 

Bobby


Edited by Bobby Strain, 27 September 2017 - 09:58 AM.


#3 Art Montemayor

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Posted 27 September 2017 - 01:31 PM

Bobby Strain is precisely correct.  You should clearly define exactly what it is that you propose or plan on doing.

 

You label this thread as having to do with a reboiler.  Although a "reboiler" is a generic heat exchanger, it actually is a true vaporizer.  It is the heat source that coverts a saturated liquid into saturated vapors that are used to fractionate or strip liquids in a distillation column or stripper.

 

Since there is a phase change resulting from a reboiler application, this requires accurate knowledge of the physical state of the liquid in question that is being heated and partially vaporized.  Accurate identification of the state of that liquid is required in order to identify its properties and allow proper process design.  Is that what you are trying to describe?  Why have you already arrived at the selection of a kettle type of reboiler - as compared to other types?

 

A lot of more basic data involving your query is needed.



#4 Padmakar Katre

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Posted 03 January 2018 - 04:53 AM


 

High pressure demethanizer and deethanizer are few examples which general operate close to critical conditions. The density difference in your case is quite low, though I don't have an experience but i have seen 1.5 - 2 dynes/cm surface tension values and these are thermosyphon reboiliers works absolutely fine.






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