Mass Transfer Cooling Parts in Pressure Furnace

[KevinJanisse]

I am having difficulty determining the cooling rate of the following application:
600 lbs of 1/4" x 4" steel pins (approx 7100 pins)
Cooling medium: Nitrogen at 15 psig
Gas recirculation at 5000 CFM
Initial load (pins) temp: 2000 deg F
Gas temp into load area: 150 deg F

The first issue I have is determining the final gas temperature as it leaves the load area to go into a heat exchanger. From this I will then need to size the heat-exchanger needed.

Can anyone recommend a solution to this problem.

Thank you

 

[MintJulep]

Are the pins in some sort of uniform orientation, or do the just get dumped on a tray or belt?

If they are random, its eems like a numerical solution for this would be a real bi*&$ to develop. Somewhat easier for uniform orientation. I suppose one of the higher-end CFD packages could deal with it, but it is a non-steatdy state problem. I'm not convinced that the CFD boys are quite there yet for transient analysis.

In either case, I'd think it would be much easier to do a few small-scale tests

 

[botrous]

Can you post a sketch of what you are talking about , cause really i'm having difficulty to deal with only written technical issues

 

[KevinJanisse]

The pins will be racked in a vertical position. The airflow will be turbulent coming from a 360 degree pattern towards the load.

Thank You,

Kevin Janisse

 

[KevinJanisse]

Does this forum accept any graphics format so I can post a picture?

Thank You,

Kevin Janisse

 

[IRstuff]

only to the extent that any individual's browser can display the image. JPG and GIF are pretty safe for that.

However, the actual graphic file must be hosted elsewhere.



TTFN