This topic contains 2 replies, has 1 voice, and was last updated by Anonymous 8 years, 5 months ago.
February 11, 2012 at 6:08 pm #1943
few months we have a problem of loss of catalyst from the regenerator of FCCU refinery. The APS of the catalyst of equilibrium is 100 microns and the fraction 0-80 is below 30%. The make-up is 4 t / d can maintain a stable level of the regenerator. The plant is UOP, with injectors charge S & W. The unit processes 5300 t / d charge composed of 50% from low-sulfur atmospheric residue and the remaining 50% is charged from a hydrotreated DAO Gofiner, the unit operates in partial combustion (6% CO in the flue gas). Despite the losses, I found a setting that allows me to keep the system running stable at maximum load and with slightly higher conversion than the LP model, there were no post-combustion phenomena. The question is how long I can keep the system running stable? According to you, enter the make-up mixed fresh catalyst to catalyst the equilibrium rate of 70% -30%, is a useful strategy? The stop for maintenance is scheduled for next year, I would get the appointment with no intermediate stops …
March 22, 2012 at 3:17 am #4683
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February 27, 2013 at 11:53 am #4530
Some years ago we had a similar problem in one of our VGO Orthoflow KBR units. We had erosion in regenerator cyclons and also some problems in regenerator air grid. The APS in e-cat was progressively increased (also APS in 4th stage fines). We manage to keep the unit running in such conditions during one year. But the increase in APS was progressive, going from 85 to 105 microns during this year, and we don’t really have ASP higher than 100 microns during a long period (just some weeks previous to the scheduled shutdown). Your current situation seems to be worst than ours.
The strategy we use was to increase fresh catalyst addition (you may have some problems to maintain MAT unit at optimum level), recycle e-cat+fines and carefully adjust areations in standpipes to keep the coarser e-cat fluidized and circulating. Standpipes, slide valves and bends would be the first points were you could experience problems. It is important to monitor circulation and fluidization at these points, and increase areation if necessary
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