32.5% urea Diesel Exhaust Fluid - heat exchanger tube material?
32.5% urea Diesel Exhaust Fluid - heat exchanger tube material?
(OP)
I'm looking for the best material with high corrosion resistance to 32.5% urea, that also has high thermal conductivity to be used in a heat exchanger. The urea will be in the tube side, pumped in at 60F and heated to 350F. Therefore, the tubes will initially contain urea liquid then after boiling point - ammonia gas, co2 and h2o vapor.
From my research:
Copper alloy - high thermal conductivity, poor ammonia corrosion resistance.
Aluminum - high thermal conductivity, unclear about ammonia corrosion resistance.
Stainless - high corrosion resistance, poor thermal conductivity.
From my research:
Copper alloy - high thermal conductivity, poor ammonia corrosion resistance.
Aluminum - high thermal conductivity, unclear about ammonia corrosion resistance.
Stainless - high corrosion resistance, poor thermal conductivity.





RE: 32.5% urea Diesel Exhaust Fluid - heat exchanger tube material?
Aaron Tanzer
www.lehightesting.com
RE: 32.5% urea Diesel Exhaust Fluid - heat exchanger tube material?
Any idea why ISO specifies no aluminum for 32.5% urea (AdBlue brand)
RE: 32.5% urea Diesel Exhaust Fluid - heat exchanger tube material?
If you have 1/3 the wall thickness that you would need in Al or Cu then the difference is negligible.
The largest resistance to heat transfer is the surface film anyway, the tube walls in any metal will only be a few % of the total resistance.
Worth reading:
Material Corrosion Investigations for Urea SCR Diesel Exhaust Systems
Date Published: 2009-10-06
Paper Number: 2009-01-2883
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Plymouth Tube
RE: 32.5% urea Diesel Exhaust Fluid - heat exchanger tube material?
RE: 32.5% urea Diesel Exhaust Fluid - heat exchanger tube material?
It is a variant of 316 developed for urea service.
See: ASTM 316L; UNS S31603; EN 1.4435
http://www.matweb.com/search/datasheet.aspx?matgui...
also see:
http://www.matweb.com/search/datasheet.aspx?MatGUI...
RE: 32.5% urea Diesel Exhaust Fluid - heat exchanger tube material?
This is DEF right?
So it will be clean with minimal contaminates.
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Plymouth Tube
RE: 32.5% urea Diesel Exhaust Fluid - heat exchanger tube material?
We only have air for the reactor do you know of any heater/blower combos that will supply 350-400F air at 500-800scfm?