Seeking advice on anti-corrosion issues for boiler flue gas pipelines
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Dear seniors, I have a question: This year, the smoke pipes of the boiler were upgraded; they were made of ordinary spiral steel pipes, but they corroded within less than a year (the cause identified was SO2/CO2/H2O). What material should be used inside these pipes to prevent corrosion? Flue gas temperature: 140°C. Thank you!
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ND steel can be used for the pipes, with the inner surface protected against corrosion using glass phosphide sheets. The price is lower than that of Pizavi Zhen VEF.
Flue gas at 140 degrees shouldn’t cause corrosion, right? Is it not usually only low-temperature flue gas after desulfurization that requires corrosion protection?
The key point is that the temperature of the flue gas at the chimney outlet is already low; condensate water will flow down along the wall of the chimney, which can easily lead to dew point corrosion.
When we purchased the boiler, the manufacturer recommended ND steel, which is a special type of steel designed for corrosion resistance in boilers