On material selection for steel chimneys
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Is SNCR-SCR combined denitration + bag filter dust removal + sodium-alkali method for desulfurization used with a steel chimney?
Ordinary steel is not very useful; it only lasts 1 to 2 years. ND steel can be used, with glass phosphor sheets as the lining.
This post was last edited by Shutong on 2022-12-24 at 15:14. Selective catalytic reduction (SCR) is widely used, while selective non-catalytic reduction (SNCR) is less common; the combined use of these two methods is indeed rare. My structure here is made of reinforced concrete, with anti-corrosion material applied on the inside. Over an 8-year period, anti-corrosion maintenance was carried out during the major overhaul in 2016; now, after another 6 years, corrosion has become severe again. The process system does not have GGHs, and the temperature of the flue gas inside the chimney is low (in Inner Mongolia), resulting in severe acidic corrosion.
If money is no object, titanium is a better choice.
Carbon steel can also be used, but anti-corrosion measures must be taken; feel free to contact me if needed