Catalytic slurry reprocessing
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During normal production, the catalytic slurry is not recycled; is it still necessary to maintain slurry circulation in the slurry recycling pipeline? Is it necessary to establish this path loop for starting work? Thank you.
It is no longer necessary to reprocess oil slurry as raw material in various refineries
There is no need for slurry circulation in the slurry reprocessing pipeline; slurry reprocessing can be employed when the regeneration temperature is low or when there is insufficient heat for coking. If it is shut down, it can be replaced with flushing oil and the oil slurry can be used to reprocess the line for use next time. Now, the oil slurry reprocessing lines of new units are all equipped with flushing oil lines. There is no need for cycling at startup; it is sufficient to pay attention to the heating rate and to tighten the pipelines thermally to prevent leaks when bringing them into use. There’s one thing I don’t understand here: how does the slurry reprocessing line circulate? Is there a circulation line?
To ensure the long-term operation of the unit, we have stopped the reprocessing of oil slurry in order to reduce coking
Some have a line that returns from in front of the nozzle back to the refinery tank, allowing a continuous small flow.
I haven’t seen it; has the slurry mixed with the raw material in front of the nozzle? You are referring to the nozzle preheating circulation line with orifice plates on each nozzle, right?
The slurry feed line is equipped with orifice plates or valves connected to the return line, just like the raw material feed line
Which process slurry is fed separately?
The conventional MIP design features a separate slurry nozzle, but it has never been put into use
Most of the slurry reprocessing nozzles are no longer in use; we have stopped using them here for several years now. When reprocessing, the material can be fed directly into the raw material buffer tank and then mixed before being fed in, while when reprocessing is not necessary, it suffices to maintain a slight excess of warm fluid in the system.