Dew point corrosion in heating furnace chimneys
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Figure 1 shows that, due to the fact that during the operational process the flue gas temperature remained within the range of the low-temperature dew point, the carbon steel chimney suffered corrosion and perforation after more than 2 years of use; Figure 2 depicts the condition of the chimney after repair. The lesson to be learned from this incident is that for metal equipment in flue gas systems, it is essential to avoid the flue gas dew point in order to prevent corrosion of the metals.
It’s useless, unless the chimney material is changed to titanium.
Sinopec requires the outlet temperature of the air preheater to be reduced to 90°C. Is there a reasonable scientific basis for this requirement? Discussion
Cases of chimney dew point corrosion illustrate that prolonged exposure to low-temperature dew points can cause severe corrosion or even perforation in carbon steel chimneys. After repair, control over the process operations should be strengthened to ensure that the exhaust gas temperature stays away from the low-temperature dew point range, thereby preventing corrosion of metal equipment. .