Corrosion issue of expansion joints in flue gas pipelines of remaining boilers
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Corrosion problem of expansion joints in the flue gas pipelines of the auxiliary boiler: Due to environmental regulations, a new water seal tank was installed on the flue gas bypass line of this auxiliary boiler; after its installation, corrosion of the expansion joints located above the flue ducts occurred. How should this issue be addressed?
Change the material and see what caused the corrosion; use a corrosion-resistant material instead
It’s currently 304; what material would be suitable to replace it with?
It is flue gas dew point corrosion; the catalyst is not corrosive
The flue gas temperature is relatively high, so the moisture content should be low
The flue gas contains moisture, which leads to dew point corrosion; this reduces the temperature drop on the outer wall and lowers the moisture content in the flue gas
Planning to use main air during maintenance; using unpurified air results in higher costs