Ethylene heat exchanger 1

[packo]

i need a recommendation about type of counter-flow shell&tube exchanger for ethylene
ethylene parameters are (shell)- in 1bar,-96 deg.C
out 1bar,30 deg.C
(tube)-in 15bar 30deg.C
out 15bar -40 deg.C
all phases are gas state
exchanger should be avaliable for easy and quick mechanical cleaning(especially tubes because that's where dirt come),i think u-tube type should be inappropriate for this
any suggestions?
tnx

 

[Montemayor]

Packo:

Your description is not clear. Do you mean an Ethylene gas-to-Ethylene gas heat exchanger? Or do you mean an Ethylene to anothe fluid heat exchanger?

Which fluid (side) has the "dirt"? It makes a big difference. At -96 [sup]o[/sup]C your ethylene has to be coming from a gas cryogenic separation unit -- am I right? If I'm right, there can be absolutely no dirt in that stream. In fact, any cryogenic derived gas or vapor is a "dream stream" because it is absolutely free of any solids or water.

In a gas-to-gas exchanger you are going to confront the use of fins on the tubes - depending on whether you have to reduce the physical size of the heat transfer area or not. Once you have to employ fins, you have pretty well bought into having to ensure that the gas fluid is free of any contaminants - especially solids (like "dirt").

You may be just speculating or thinging that you have to make allowances for any appearance of dirt in the fluid in the future. If that is the case, then you are on your own in forming that conservative approach. Can you furnish some detailed data and background information?