Nozzle Orientation

[Chemitofreak]

Hi,

I have a query.

In a thermosyphon reboiler what is a better option for nozzle orientation i.e. whether the liquid inlet nozzle shall be radial or axial?

How much difference will the nozzle orientation make in the actual design of the reboiler.

Thanks in advance.


Dinesh S SHELATKAR
Process Engineer

 

[EmmanuelTop]

Which type of reboiler are you talking about? Horizontal thermosyphons and kettles will always have radial inlet nozzles located on the bottom side of the shell. Vertical thermosyphons have axial inlet nozzle, due to the fact that process fluid flows on the tube side.

So it does make a lot of difference if you mix up the nozzle locations.

Dejan IVANOVIC
Process Engineer, MSChE

 

[Chemitofreak]

Thanks Dejan for a prompt reply.

My reboiler is vertical thermosyphon type.

Can you throw some more light as to why radial nozzle is not acceptable in the vertical thermosyphon type ?

If I am not wrong, we can reduce the elevation of the vertical thermosyphon reboiler by providing a radial inlet nozzle.

Thanks once again.

Dinesh S SHELATKAR
Process Engineer

 

[EmmanuelTop]

Are you referring to the following arrangement?

Dejan IVANOVIC
Process Engineer, MSChE

 

[Chemitofreak]

Dejan,

Bingo...!

I am referring to the same arrangemnet.

My query is, what difference does it make if the inlet nozzle orientation is radial instead of axial as show in the figure.

Thanks a ton in advance.

Dinesh S SHELATKAR
Process Engineer

 

[EmmanuelTop]

There are no differences in hydraulics for the two arrangements since liquid head below the bottom tube sheet cancels out on both sides. The inlet nozzle may enter the lower head at the bottom or side (radially or axially), whichever is most convenient depending on the exchanger head type and ground clearance.

As for the piping design, there is a famous R.Kern's article printed in 1975 August edition of Chemical Engineering at

http://www.oocities.org/thegossipsite/How_to_Design_Piping_for_Reboiling_Systems.pdf

Dejan IVANOVIC
Process Engineer, MSChE

 

[EmmanuelTop]

Also look at

http://www.slideshare.net/GerardBHa...992-9c31-e818f54e02ed&v=qf1&b=&from_search=44

Dejan IVANOVIC
Process Engineer, MSChE

 

[25362]

Fig. 1 of the following link shows an inlet nozzle arrangement as proposed by Chemitofreak:

http://www.academia.edu/3641402/The_Design_and_Layout_of_Vertical_Thermosyphon_Reboilers