Heat Exchanger Design - Heat Recovery

[ribabata]

I'd like some opinions on how to proceed on a particular type of heat exchanger design used for heat recovery.

A single 2" SS316, Sch 40 approx. 900 ft. long that runs for 20 ft length then snakes back (U - Bend) for another 20 ft and so on. The entire tube arrangement therefore becomes approx 20' long with around 46 U bends. The runs are laid out in a fixed pitch arrangement, and is inserted in a 36" duct through which hot process gas (1200 F) flows.

The objective is to heat #6 Bunker C oil flowing through the coil from 150 to 600 F.

Can anyone suggest how to proceed with such a heat exchanger design eg. what type of heat exchanger to consider this as, calculation of U etc?

Thanks

 

[pmover]

i recommend contacting either a firm that specializes in heat recovery designs or contacting a heat xchgr mfg that has experience in heat recovery designs. in either case, defining process conditions (pressure, temp, flow, fluid, etc.) for both fluids is critical.

attempting this task yourself depends largely on your experience with heat transfer equipment and understanding of the process conditions (i.e. steady state, transient, etc.).

typically, heat recovery designs are a collabrative effort by client, engineer, and mfg.

hopefully this helps.

good luck!
-pmover

 

[srfish]

More information is needed before a recommendation can be made. What are the flows and the allowable pressure drops ?

#6 Bunker C oil is very viscous and has low heat transfer characteristics. It has a viscosity of approximately 250 centipoise at 150 F.It will probably be in laminar flow. Again, more information is needed.