Causes of Corrosion and Leakage in the Evaporation Section of Waste Heat Boilers in Chemical Plants
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This post was last edited by Zhang Wang on 2017-3-31 12:45. The waste heat boiler of the chemical plant generates 3.82MPa, 440℃ superheated steam, the evaporation capacity is about 41t/h, the superheat is about 75t/h, and a large area of pit corrosion occurs in the evaporation section. Reason for asking for advice: handshake
At first glance, I thought it was ours. Same as we had before. The outer surface of the tube bundle in the evaporation section is locally overheated, causing nucleate boiling corrosion and perforation. Water vapor enters the tube and vaporizes and erodes the inner tube. It is necessary to control the uniformity of heat extraction to prevent boiler water from being retained.
Is it caused by the insufficient height of the steam drum?
The problem is multi-faceted, including impurities in materials, impurities in boiler water, and corrosive media in waste heat exhaust gas.
There was no feedback from the material external inspection, 20G furnace tube.
No, it is caused by insufficient local circulation of boiler water to obtain heat. There are also heat sources that exceed the specified temperature.
The heat source is regeneration flue gas, which is lower than the design temperature.
Are there any DCS screenshots? Look at the temperature of the heat source inlet and outlet.
Check the water quality! Material! Medium composition!