I am considering an application which would require transporting some syngas (CO+H2) at temperatures of about 700-900C. The syngas will most likely also contain carbon particles and steam (from catalytic reforming reactions). I know both these elements can be very damaging to metals (metal dusting for instance). What corrosion scenarios can be expected, and what types of alloys would be the best choices to avoid/limit that? Are there specific strategies to follow to ensure maximum lifetime for installations?
Can you give more info about load cycle. Is it only couple of minutes or constant load?
Life time od steel pipes will be likely very short. Temperatures at 900 C are a bit high for steel as you will start to get phase transformations and precipitation of carbides.
If you can consider nickel superalloys.
Hi David,
thank you for your reply. It would be a constant load, the idea being to produce in a constant manner syngas via catalytic reaction and then transport it to burners. The catalytic reaction takes place at relatively high temperature, and as the syngas will contain a lot of CO, H2, steam and most likely carbon particles formed during the catalytic reaction, I expect that several corrosion issues might arise if the alloys employed are not chosen correctly. Therefore I am interested in knowing which alloys would be the more appropriate for the conditions I am considering. I have read that high chromium and nickel alloys, with silicon and aluminum would be favorable for avoiding metal dusting (800H type alloys). Are there some other types of alloys that would be suitable?
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