Maximum Amount of FCC slurry oil as Coker Feed

[Rang Nath Dubey]

We are planning to use FCC slurry oil in coker feed. What is the maximum proportion of same in coker feedstock. what are the issues and do we need to change recycle and / or operating pressures ?

[Anonymous]

we processed Decant oil (test) from a FCC in a DCU between 10 to 17%, the impact were in the API in the LCGO and HCGO (high contents of aromatic and polyaromatics), The recycle ratio increase until  16 %, the coke was more difficult to quench and also more impermeable and harder (must be of the change of the structure of the coke , porosity, etc. Some refiners use a small amount of it only to avoid the production of pet (coke around 5  to 7%), the LCGO production decreace and the HCGO increase
You have to take very care during the quenching/draining and cutting (is possible to get geyser)
 
During these operation we reduce the recycle increasing the outlet temperature in the heater, (we keep constant the pressure in the coke drum)
Send me your eamil and I can sent to you a presentation that We prepared for a workshop, showing these results
 
I´m sorry for my english (the presentation was prepared in English)
 
Best Regards
 

[hector]

Dear
I am interesting about your presentation
 
e-mail
hector.picon@ecopetrol.com.co

[Anonymous]

We have a new delayed coker unit and we are thinking to use de slurry oil from FCCU like feed stocks of our delayed coker units. We want to have information about this posibility.

[Matthai Markose]

Dear Guest,
I am interested in the presentation you have referred to.
 
..Matthai
matthai.markose@alcoa.com

[Sim Romero]

Most refiners dispose of slurry oil in the coker because there is nowhere else to go with it.  Some use slurry oil to control or avoid shot coke – especally in the cone section of the drum. Finally, a few use slurry oil to control the metals and sulfur in anode grade coke.
 
FCC slurry oil boils in the same range as heavy coker gas oil – approximately. So when the slurry oil is fed to the coker most of the slurry oil vaporizes out of the coke drum and reports to the gas oil product.  This is highly dependent on the pressure/temperature of the coke drums.
 
KBC, the company I work for, has done this type of analysis many times.  The economics of sending FCC slurry oil to the coker gets complicated with the gas oil yields in the Hydrotreater(HT) and then the FCC.  A low pressure HT will send aromatic (due to the slurry oil) coker heavy gas oil to the FCC which then will yield higher amounts of slurry oil.  The net results is an increase in slurry oil, poor utilization of the coker, the hydrotreater and the FCC.  However if the HT operates at sufficient pressures to breakup the polynuclear aromatics in the coker gas oil then this might work well.  Bottom line is this is not a simple issue.
 

[giselapalmero]

Dear Guest,
I am interested in the presentation to which you have referred. We plan to increase the flow of slurry oil from FCC and our coke.

Gisela
gisela.palmero@ypf.com
giselapalmero@hotmail.com

[Author]

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