How to deal with a blocked calcium sulfate pipeline?
Thread Content
The pipeline from the alum MVR evaporator to the centrifuge became clogged due to a shutdown; it is filled with alum crystals. How should this be dealt with? Thank you
Dissolve and rinse with hot water? Or the pipe was disassembled and cleaned manually
This should have been taken into account during the design phase! If there is no other option, it is recommended to disassemble it and clean it manually
Take it apart and wash it with hot water. After cleaning, modify this section of the pipe: it should be easy to disassemble and well-sealed. Additionally, proper air drying treatment at the overall intake side must be ensured.
The valve is located near the evaporator; steam or hot water is connected below the valve. After shutting down the system, steam or hot water should be used immediately to clean the pipes. A thickener should be installed behind a normal evaporator.
This post was last edited by jintchinssen on 2017-9-7 at 09:17. Based on the situation described by LZ, it is inferred that this issue stems from the fact that appropriate hot water flushing pipes were not taken into account or installed during the design or piping installation process; in addition, measures such as proper insulation of the pipes and established procedures for emergency discharge in case of accidents are lacking
Most likely, after parking, the mother liquor wasn’t drained completely!
I’m here to ask for some advice{:2_31:}
Use segmented steam heating for dissolution; this needs to be taken into account during the design phase. The casing is taken into consideration during design, and the pipes run at an upward slope to ensure complete backflow during shutdown.
A drain valve should be installed at the lowest point of the pipeline; it should be used to drain the contents every time the system is shut down. Make sure that the drain opening is positioned at an oblique downward angle, as a direct downward opening may often get clogged； If it’s already blocked, and the blockage is severe, it’s recommended to use steam to clear it; water won’t work, and it will take forever to resolve the issue.