Shutdown issue
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When shutting down the operation, when should the intermediate circulation pump be stopped? Should it be stopped once the pump is empty, or when the top temperature drops to a certain level? To what extent should the top temperature drop before stopping it?
The shutdown has focused on oil return to reduce the burden of line cleaning. After the pump has been used for evacuation, stop it; repeat this process several times to purge the tower
I haven’t been involved with your field of technology; it seems to be coal chemical engineering, while my expertise lies mainly in fine chemical engineering； Professional advice is needed
Personal operating practice*: The top temperature is used as the criterion for stopping the pump; pumping stops when the top temperature falls below the flash point of the material at the top of the tower. The specific operations are determined based on the process and on-site conditions.