The exhaust temperature of the decompression furnace is high. Please give your advice
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The exhaust temperature of the decompression furnace is 160 degrees. Thermal efficiency 91.8%. How to reduce flue gas temperature and improve thermal efficiency?
160 is low enough; aren’t you worried about dew point corrosion?
160 should be considered relatively low! If it drops any further, and the natural gas used in the heating furnace has not been thoroughly desulfurized, dew point corrosion is likely to occur. Now there are technologies that can reduce the flue gas temperature to below 100°C.
But the flue gas temperature of our atmospheric pressure furnace is only 120 degrees. The thermal efficiency is 93%
Starting from 160° and going downward, the flue gas temperature can only be reduced by properly operating the waste heat recovery system.
What type is your air preheater? Are atmospheric pressure furnaces and reduced-pressure furnaces sharing the same waste heat recovery system?
Could the experts upstairs explain to me what dew point corrosion is?
Flue gas dew point corrosion is primarily caused by sulfur dioxide and sulfur trioxide in the flue gas reacting with water to form sulfuric acid and sulfurous acid, thereby leading to corrosion of the furnace tubes