New baffle in stripper

[Vanesssa]

Hi to everyone,

I have been asked to do a check and I have some doubts.

I have a kerosene stripper which is fed from a fractionation column.

Currently There is no baffle at the base of the stripper and the heat is supplied by means of a furnace (part of the bottom stream passes through the furnace before being sent back to the stripper).


I was wondering which are the benefits of installing a baffle at the base? Additional equilibrium stage?

Another point, if the furnace was to be replaced by a reboiler (to recover heat of a residual stream) there could be 2 options: thermosiphon or forced circulation using a pump.

Obviously there would a difference in the heat tranfer coeeficient, but would there be any other considerations to choose the best option?

Any suggestions on correlations to be used for this system?


Thanks.

 

[25362]

Use the Search function by writing reboilers. You"ll find a lot of interesting information.

For example: thread124-109489, thread124-114441, thread124-163832

 

[ash9144]

Thermosiphons are good for clean service. If fouling service use forced flow.

 

[sshep]

A simple overflow baffle is primarily used to provide for constant inlet head in a thermosyphon reboiler. My experience with fired reboilers is that they have always been forced circulation so a baffle is not needed. With respect to using a baffle to get an extra stage, it entirely depends on the reboiler return location. If the return is to the reboiler feed side of an overflow baffle, then you are still mixing what went through the reboiler with what comes from the bottom tray. This is the same as you have now and therefore no extra stage.

It is possible to use an underflow baffle as a simple partition to get an extra stage. This is done by taking reboiler feed from the same side which is getting liquid from the bottom tray. The reboiler then returns to the other compartment where the product draw is taken. The excess then underflows to back to the reboiler feed side.

best wishes,
sshep