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Kettle Type Reboiler Inlet Piping Arrangement

reboiler kettle inlet line

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#1 ayan_dg

ayan_dg

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Posted 27 January 2015 - 05:46 AM

I am designing an Amine Regenerator where a kettle type reboiler is used. Saturated LP steam at 3.5 barg flow through the tubes and amine solution is on the shell side. Amine is drawn through a total draw-off chimney tray and the lean amine overflow across a weir in the reboiler and goes back to column sump and then to lean amine pump suction.

My question is where should I connect the reboiler feed line (column drawoff) at the vapor space of the reboiler or at the bottom of the reboiler .



#2 Art Montemayor

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Posted 27 January 2015 - 10:24 AM

Ayan_dg:

 

Amine Stripper-Reboiler combinations are employed in two ways:

  1. The stripper is mounted directly on top of the reboiler (in small plants);
  2. The stripper and reboiler are mounted on their own foundations and inter-connected with the required piping.

You fail to tell us which version you are designing.  Therefore, I have to assume you mean the latter.  This topic has been discussed and commented many, many times before in our forums and I am attaching a response I made 6 years ago in the form of a Process Flow Diagram.  The best way for a professional engineer is to communicate with sketches or drawings.  This is such a correct, accurate, and specific way of communicating process information and yet so many young engineers fail to use this practical and accurate tool.  The only reason I can come up with is laziness.  Please note the following on this PFD:

  • The amine entering the reboiler originates in the stripper sump and enters the reboiler at the front end, preferably through a side nozzle that is elevated approximately 6 inches from the reboiler inner bottom surface.  This is to allow positive, slow amine flow through the length of the reboiler steam bundle and leaves space at the reboiler bottom for the sludge and other solids that may form in the kettle.  You must not allow this line to plug up and stop all flow to the reboiler.
  • The lean amine exiting the reboiler does not go back to the sump as you state.  It goes directly to the Amine heat exchangers.

I hope this clarifies your query and responds directly to it.

 

Attached File  MEA - Acid Gas PFD.xlsx   44.69KB   88 downloads



#3 Zauberberg

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Posted 28 January 2015 - 10:41 AM

Reboiler inlet lines come on the bottom side of the reboiler, or slightly elevated as pointed out by Art. Multiple entries may be required to limit the inlet velocity below 0.5 m/sec. High velocities will promote increased agitation inside the reboiler, resulting in unstable heat input and possible carryover.






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