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Vanadium effect on stainless steels

Vanadium effect on stainless steels

Vanadium effect on stainless steels

(OP)
Hello...I have a furnace that heats a stream of hydrogen, h2s,and heavy naphta from 320 to 380 °C. The tubes are made of 321 SS. The furnace is prepared to burn fuel oil. However our fuel oil contains now 200 ppm of V (originally, when the furnace was designed didnt contain V). The question is if vanadium will corrode the ss of the tubes, or if it will affect the expected tube life.
 

RE: Vanadium effect on stainless steels

I do not have any scientific data to show for it, but when I started as a process engineer, the PE's that were over me always told me to keep an eye on the overhead product coming out of a vacuum distilltion column for Cd and V. They told me if the Analyzers ever read over 100 ppm of Cd or V that it would accelerate the corrosion of stainless.


Will Chevron Corp.

RE: Vanadium effect on stainless steels

I would be more concerned with the presence of sodium in the furnace fuel, which if in any significant concentration will form  low melting and corrosive eutectic tube deposits with vanadium. Vanadium as such (without sodium)should essentially oxidize to vanadium pentoxide which I would expect to be minimally deposit forming in the furnance conditions you allude to.

Orenda

RE: Vanadium effect on stainless steels

I have always heard that V2O5 is highly corrosive for the burner gun and the combustion chamber's environment,piping& steel members etc.

Our forum's more learned mechanical colleagues and corrosion experts may give some good guidance here. or

think posting on corrosion related forum to have a pertinent reply.

Best Regards
Qalander(Chem)

RE: Vanadium effect on stainless steels

(OP)
The fuel oil also contains 90 ppm of Na...

RE: Vanadium effect on stainless steels

Given the sodium content of your furnace fuel, I would suggest adding a magnesium-based compound, in yourcase probably an organo-magnesium compound such as magnesium sulfonate or similar to the fuel being burned to form a high melting, essentially non-corrosive and esaily removed (friable) deposit of vanadium-sodium-magnesium. This will also minimize the formation of SO3 and condensed sulfuric acid in the furnace heat recover section (if this exists) and by neutralization of residual sulfuric acid minimize subsequent corrosion of the section elements.

Orenda

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