Tek-Tips is the largest IT community on the Internet today!
Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!
-
Congratulations TugboatEng on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!
External Corrosion of Boiler Tubes Due to Chlorides in Fuel. 2
- Thread starter stanweld
- Start date
-
1
- #2
I do not have a lot of firsthand knowledge with superheaters, however I did work at a biomass company for a while and have some documents on the effects of chlorides on stainless steels.
If you would like, I can forward these to you. None of them were prepared by me, but I think there may be some useful information in them. Some are prepared by FW, BW, etc.
Please provide an email address or some simple way to transfer the files if you'd like to check them out.
If you would like, I can forward these to you. None of them were prepared by me, but I think there may be some useful information in them. Some are prepared by FW, BW, etc.
Please provide an email address or some simple way to transfer the files if you'd like to check them out.
- Thread starter
- #3
-
1
- #5
EdStainless
Materials
Yes, it will. However your Cl level is actually rather low. A lot of coal has much higher Cl. I have seen 0.3% Cl.
There are some EPRI papers on this. I think that they are old enough to be free. Try searching on epri.com
= = = = = = = = = = = = = = = = = = = =
Plymouth Tube
There are some EPRI papers on this. I think that they are old enough to be free. Try searching on epri.com
= = = = = = = = = = = = = = = = = = = =
Plymouth Tube
- Thread starter
- #6
some useful information and papers at <
As I recall, the main problem is related to co-firing biofuels with coal. The coal has higher levels of SO2 in the fluegas, and this sulphur combines with the potassium, sodium, and phosphate in the biofuels to form a low melting temperature eutectic salt on the otuer surface of the high temperature superheater tubes. If there are local pockets of reducing environments near these tubes ( as evidenced by high CO levels), then this eutectic slat remains molten and fluxes away the protective oxide coating of the tubes.
One solution is to avoid hi CO levels by improving the biomass fuel feed arrangement to minimize slug flow pockets of unburned biomass from bypassing the main flame zone . Apparently this problem was solved at the DRAX station in England- review their fuel feed solution.
As I recall, the main problem is related to co-firing biofuels with coal. The coal has higher levels of SO2 in the fluegas, and this sulphur combines with the potassium, sodium, and phosphate in the biofuels to form a low melting temperature eutectic salt on the otuer surface of the high temperature superheater tubes. If there are local pockets of reducing environments near these tubes ( as evidenced by high CO levels), then this eutectic slat remains molten and fluxes away the protective oxide coating of the tubes.
One solution is to avoid hi CO levels by improving the biomass fuel feed arrangement to minimize slug flow pockets of unburned biomass from bypassing the main flame zone . Apparently this problem was solved at the DRAX station in England- review their fuel feed solution.
- Status
Similar threads
- Locked
- Question