How to prevent corrosion in high-temperature flue ducts before insulation?
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May I ask how to prevent corrosion in the high-temperature flue ducts of thermal power plants (200–350°C) before insulation? Are there any **or industry standards that can be used as a reference? Please provide the relevant standards and requirements.
What material is high-temperature flue gas made of? For stainless steel, no external corrosion protection is needed ； For carbon steel, applying a high-temperature resistant primer is sufficient. Refer to SH/T3022-2011 or HG/T20679-2014
Is corrosion prevention a mandatory requirement? Is it possible to just insulate without using preservatives?
High-temperature resistant anti-corrosion paint is applied to both sides, followed by insulation – this is the standard procedure; it’s not necessary to do it though, after all, insulation has already been applied on the outside.
The purpose of anti-corrosion is to extend the service life of flues; without it, leaks will occur more quickly.
Generally, after cleaning off the rust, 4 coats of high-temperature paint are applied. Finally, add insulation.