With production suspended for a month, does the waste heat boiler need maintenance?
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Dear experts, scholars, and experienced professionals: If a sulfuric acid plant is shut down for a month, does the waste heat boiler need maintenance? Thank you!
After a one-month shutdown, the waste heat boiler requires maintenance to prevent dew point corrosion.
Didn’t understand it? Do you mean nitrogen protection? Thank you!
Yes, the shell-side steam is filled with nitrogen to maintain a slight positive pressure. On the tube-side, where the flue gas is present, if the equipment is not to be inspected or repaired, it is protected using purified air or nitrogen; otherwise, purified air is used during inspections and repairs
This post was last edited by lcmqh@163.com on 2019-6-13 at 22:20. For a short period of shutdown, and without considering freeze protection, it is possible to refrain from draining water from the water side (using deoxygenated water for maintenance); however, it is necessary to prevent moisture from entering the flue gas side to avoid corrosion caused by dilute acids.