Which of the problems listed will occur when the economizer temperature is below the acid dew point of the flue gases?
⢠Acid dew point of flue gases and what happens when metal surfaces are colder than this temperature ⢠How sulfur compounds and water vapor in exhaust form acidic condensate ⢠Typical damage type in economizers exposed to acidic condensate over time
⢠Think about what physically happens when hot, sulfurâbearing flue gas hits a tube surface that is colder than the acid dew pointâdoes something change from vapor to liquid? ⢠What kind of longâterm damage would repeated exposure to acidic liquid on the outside of tubes most likely cause? ⢠Compare which option is directly related to chemical attack by an acid rather than mechanical or highâtemperature issues.
⢠Verify which choice clearly involves chemical corrosion rather than mechanical cracking or thermal stress problems. ⢠Eliminate any options that usually occur at very high metal temperatures rather than low, condensing temperatures. ⢠Confirm that your chosen option fits with damage caused on the gasâside surface of economizer tubes where acid might condense.
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