Is dissolved sulphate in boiler feed-water stable, or is there a possibility of the thermo-chemical reduction of the dissolved sulphate to H2S during the rather short residence time in once-through steam generators?
I'm not a chemist myself, but for getting H2S, you need hydrogen element from H2O and by thermal only, about 2200 deg C temperature needed for water to start breakdown into separate oxygen and hydrogen (other side of story happened for electrolysis). Meanwhile, if the boiler is empty or there is some oxygen left over, maybe you have to start worry more about SO2 formation since SO2 happened at quite low temperature
Generally, I agree with the answer provided by Dr. Fitriah. You need a reductant.
Furthermore, look up the Pourbaix diagram of sulfur (Garrels and Christ, Solutions, Minerals and Equilibria). At 25°C, reduction is not possible without a reductant.
This applies also to the formation of sulfur dioxide, mentioned above.
Sulphate is spelled sulfate (IUPAC)
- Badges
- Science topic
- Similar topics
- Engineering
- Petroleum Engineering
- Gas