How to determine dew point corrosion in heating furnaces?
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How to determine dew point corrosion in heating furnaces? ? ? ? ? ? ? ? ? ?
Dew point corrosion primarily affects the flues of furnaces, as it prevents hydrogen sulfide or sulfur trioxide from causing corrosion in the equipment when they come into contact with water. Generally, the temperature of the furnace is kept above 100 degrees Celsius; I believe it’s important to consider the dew point temperature of hydrogen sulfide, and keeping it above 150°C should be sufficient to avoid problems.
Take a look at this: waste heat recovery from heating furnaces – http://bbs.hcbbs.com/viewthread.php?tid=348948. This is about dew point corrosion – http://bbs.hcbbs.com/archiver/tid-336393.html
Dew point corrosion should be a calculated value, primarily determined based on the sulfur content of the fuel gas. High sulfur content, high dew point corrosion temperature ； Low sulfur content, low dew point corrosion temperature ； Refer to the book \"Tubular Heating Furnaces\" published by Sinopec Press, which is currently the only professional book on tubular heating furnaces available in China.
Flue gas dew point corrosion occurs because sulfur-containing elements in the fuel are oxidized to sulfur trioxide during combustion; when the temperature of the outer surface of the heat exchange surface is lower than the flue gas dew point temperature, sulfuric acid mist and droplets form on that surface, leading to corrosion. The flue gas dew point temperature is related to the partial pressures of water vapor and sulfur trioxide in the flue gas, so this value can be determined by consulting tables
There are relevant calculation formulas; you can look for them. I found them by searching on the Internet
It is best to use a calibrated dew point meter for regular measurements in order to obtain accurate values, which facilitates proper adjustment of the operations. The general formula is not very accurate.