KETTLE REBOILER BAFFLE SELECTION AND SPACING
KETTLE REBOILER BAFFLE SELECTION AND SPACING
(OP)
I am trying to design a Kettle Reboler for a Demethanizer where the liquid entering will have to raise its temperature by around 15C due to the flasing of almost 3% of its mass. The liquid composition is Methane, Ethane and Propane (basically).
The heat experts that I have consulted are confused about the fact of raising the temperature on a kettle reboiler since they have used them in propane refrigeration services where the "boiling" of the propane is done in isothermal conditions, while here I am needing to raise the temperature to flash some of the methane.
The heat experts do not know how to deal with the temperature increase along the tlenght of the U tube bundle. They have shown me only temperature profiles on the vertical axis and keep talking about "recirculation in the vertical axis but nothing about the "recirculation" on the longitudinal axis> they also do not know how to calculate the temperature increase of the liquid along the longitudinal axis. Additionally they say they do not believe HTRI progfam for those calculations...
Hence, if anyone can provide me some ideas, certainly a will appreciate that very very much.
Kind Regards
The heat experts that I have consulted are confused about the fact of raising the temperature on a kettle reboiler since they have used them in propane refrigeration services where the "boiling" of the propane is done in isothermal conditions, while here I am needing to raise the temperature to flash some of the methane.
The heat experts do not know how to deal with the temperature increase along the tlenght of the U tube bundle. They have shown me only temperature profiles on the vertical axis and keep talking about "recirculation in the vertical axis but nothing about the "recirculation" on the longitudinal axis> they also do not know how to calculate the temperature increase of the liquid along the longitudinal axis. Additionally they say they do not believe HTRI progfam for those calculations...
Hence, if anyone can provide me some ideas, certainly a will appreciate that very very much.
Kind Regards





RE: KETTLE REBOILER BAFFLE SELECTION AND SPACING
Because of the mixing assumption used in sizing, your question seems to be along the lines of asking for a temperature profile in a CSTR- the assumptions used in the engineering model preclude obtaining the profile which you desire. I also think you are adding additional complexity where it is not needed. This is my opinion, others may see it differently.
best wishes,
sshep
RE: KETTLE REBOILER BAFFLE SELECTION AND SPACING
RE: KETTLE REBOILER BAFFLE SELECTION AND SPACING
Vol 3 of Ludwig's Applied process design for chemical and petrochemical plants deals with kettle reboilers in a manner that may be of help in your design.