2 replies to this topic

[shazzad1613]

So for my final year design project I need to heat up liquid nitrogen from -193 to 25 degree C. The flowrate is 89000 kg/hour. This is an input to my haber bosch process. So my question if I can use shell and tube heat exchanger for this process. Also would appreciate if anyone could give me a cost estimate and dimensions with flowrate for a plate fin heat exchanger.  

[breizh]

Hi,

Check for vaporizer on Internet. Prepare a specification sheet, contact manufacturer and ask for a budgetary price, should be quick and more accurate.

Good luck

Breizh

[Pilesar]

I understand that student projects may have impractical constraints. Your questions point to what seems an impractical process. I am interested to hear a fuller process description.

89000 kg/hr is a lot of liquid nitrogen. This would be about 150 trailer loads of liquid N2 every day! If you plan to generate purity nitrogen on site, then why liquefy it only to vaporize it? Keep the nitrogen a gas and compress it for transport by pipe. Haber Bosch historically uses air for the nitrogen source and not pure nitrogen. 

Aluminum plate fin exchangers are mechanically sensitive to temperature differences and only used where the temperature approach is very small. Nitrogen can be vaporized by ambient air. Large quantities can be vaporized by flue gas from a fired heater.