High nozzle pressure
Thread Content
The pressure at the feed nozzle of the catalytic cracking unit has been 0.85 MPa since operation began; adjusting the atomizing steam and reducing the processing volume did not yield good results, and using 3.5 MPa steam also proved ineffective, ultimately leading to an excessively high solid content in the slurry. Is the high nozzle pressure caused by blockage or coking? And if it is blockage or coking, what causes that?
It is possible to seal the bed and open the lift pipe to remove coke； Once it’s opened, you’ll know whether there’s a blockage or coking; the most likely possibility is coking.
The external piping is fine; it might be coking