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Subject : Vacuum Tower Tube Failure |
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I'm searching for the procedures that should be used in a vacuum tower furnace tube failure. If we have a tube failure the vacuum tower pressure should be increased to atmosphere pressure? And generally what other items should be considered?
Number of responses: 0
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Subject : FCC Feed preheat temperature |
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What is the best way to increase feed preheat temperature by minimum disturbance to other parameters?
Number of responses: 1
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Subject : Deposition of fines in turboexpander FCC unit |
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In one of our FCC units (Kellogg Orthoflow model), we are suffering severe problems of fouling (fines deposition) in the turbo expander. The scheme of the flue gas circuit is: two stage cyclones in the regenerator + Shell Third Stage Separator before turbo expander + 4th Stage Separator (cyclone) to recover flue gas from fines coming from TSS.
We have also observed high level of moisture in the fines from 4th Stage Separator (10-15%wt). So we suspect that the fouling of the expander is due a cold point in the flue gas circuit (where flue gas humidity is condensed) or an uncontrolled inlet of water / steam.
Has anyone experienced this kind of problems in an FCCU? What could be the potential causes of the severe fouling of the expander?
Number of responses: 1
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Subject : Minimum MAT activity in FCC unit |
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My question is related with the minimum MAT activity that can be reached in a FCC unit. The main objective in one of our FCC units is maximum middles distillates, and we run this unit at very low severity. The MAT activity of the e-cat is 54-55%wt, with some punctual values of 52-53%wt.
We would like to decrease e-cat activity even further, but we have some concerns and doubts about potential problems that could arise, like definitive loss of cracking activity, significant increase in bottoms production, etc.
Has anyone experience running and FCC unit at MAT activity below 52-53%wt? What problems could appear with such low MAT activity?
Number of responses: 0
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Subject : Burner for low pressure gas |
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Is it possible to burn gas directly from the atmospheric distillation after overhead condensor with 0.4 kg/cm square in a low pressure burner?
Number of responses: 3
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Subject : Ground flare |
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I see a ground flare in a petrochemical complex. Why it is used instead of flare stack?
Number of responses: 2
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Subject : Cleaning Amine Systems |
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We recently cleaned a plant with Amine Gasoleos hydrodesulferised Coke in the Madero refinery in Mexico, the results were excellent but the system had formed many sludge. I would like to know the negative effects if Amine systems are not cleaned.
Number of responses: 1
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Subject : Foaming problem in RDS amine absorber |
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We had a foaming problem in our RDS unit last month, during the period of abnormal high level of absorber, we found a lot of particle plugged in lean amine supply pump filter (downstream of antifoam inject), and XRF analysis show high silicon content (>15 wt%), we wonder silicon-base antifoam cause agglomerate amine particle (iron sulfide, Carbon, etc), after an unplanned shutdown for cleaning amine absorber, we also found similar particle plugging absorber tray.
(1).has someone experienced the same problem in your amine absorber?
(2).What is the best practice to treat antifoam? Shall we change silicon free type antifoam?
Number of responses: 1
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Subject : Mercaptans in Fuel Oil |
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Is there any standard method to find out the Mercaptans / H2S in fuel oil?
Number of responses: 0
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Subject : Maximum feed preheat temperature in FCCU |
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My question is related with the maximum temperature that can be reached in the feed preheated furnace in FCC unit. We operate one of our FCC units in maximum distillates mode and we want to decrease cat/oil to minimum. Currently, we have the following design limits in the feed preheated furnace: 360C (680 F) in the process size and 419C (786F) in the skin points of the furnace tubes. According to a study of our engineering department, temperature in the skin points could be increased until 467C (873F). But our main concern is that an increase in temperature in furnace tubes could cause coking of the feed. Although the feed to the unit is Mild Hydrocracker residue, that has low tendency to coking.
Has anyone experience running FCC units at feed preheat temperatures higher that 360C (680F) in process / 419C (786F) in skin point?
Number of responses: 0
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