Sulfidation temperature for CS and SS 1

[Xianglu]

Gents,
Sulfidation occurs at high temperature. We currently have CS application of high sulphur content gas at temperature ~300C (H2S 2%, SO2 1%, CS2 0.1%) but low pressure (<40kPa).
I am looking at adding a fired heat exchanger to this stream, in which case, the heat exchanger tube temperature will be high.
My question is: what is the suitable temperature for use CS, SS, or special steel(what material?) in this kind of service environment?.

Thank you very much in advance.

Henry

 

[metengr]

Xianglu;
What is the tube metal temperature for the heat exchanger. For sulfidation resistance you will need a high chromium alloy steel. Tube metal temperature is extremely important and must be known for proper alloy selection (like 800H material or similar).

 

[Xianglu]

Metengr, I know you are here to help.
I am thinking of a radiant heater which could have a tube temperature as high as 1700 F. However, I am trying to lower this temperature down to a point so that the tube material is relatively easy to get.
Having said that, if I am going to use 316L, what is the max allowable T for this application?

Thanks again, Metengr.

Cheers,
Henry

 

[metengr]

Xianglu;
I would not recommend 316L in this application. It will not last under these service conditions. You going to need higher chromium and nickel compositions, as well as strength.

 

[EdStainless]

In general you need high Cr and Ni with low Mo for S resistance. What size tubes in the heater? Can they be cast? There are some grades there that will do well.
Common SS doesn't stand a chance. I don't have my books at hand to look up how high 310 will handle.

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Plymouth Tube

 

[strider6]

I suggest u this two articles on corrosion and sulfidation:

Assessing Corrosion in Oil Refining and Petrochemical Processing

http://www.scielo.br/pdf/mr/v7n1/19343.pdf

Selecting process piping materials

http://www.metallurgical.com/Publications/Publication 27.pdf

hope this help

S.

http://www.corrosionist.com