The inner steel lining of the tower section of an alkali washing tower was peeled off and the tower section wall was bulging.
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Working conditions: Acid gas is neutralized with alkali solution. The tower pressure is between -2KPa and 0.5KPa, and the temperature is between about 90℃ and 100℃.
After inspecting the entire tower, we found that many tower sections had similar problems, but they were not that serious.
Above 90°C, it is easy to become alkali brittle.
Therefore, if steel is used instead of PTFE, this situation may occur due to temperature reasons and the inconsistent expansion coefficients of the steel structure and PTFE materials.
Thermal expansion... There is "glue" between the lining and the metal...it will still fail after a long time
Thermal expansion and contraction, two layers of skin are broken, too much acid gas enters, or the circulation volume is insufficient, and the circulation cooling effect is poor.
Negative pressure and high temperature caused the lining to separate from the steel.