[Lucibar Davalillo]

Does anybody know if this project to built a new flexicoker in Greece is still going?
Petrola Hellas             P     Qtr 1, 10    100,000  New CDU: 40,000 B/d,    
Elefsis                            to                  hydrocracker, 20,000 B/d
Hellenic Petroleum SA            Qtr 1, 10             flexi-coker scheduled to
Greece                                                 begin production in early 2010.
                                                  Unit contracted to be built by Technip.    

[Lucibar Davalillo]

Mr. Randal,
I found this report very helpful and your comments very valuable; there may be too many others issues going on that we coking people have not dedicated enough time to comment, but no doubt you’re doing a great job keeping us inform.
 
Will try harder keeping up with this report if you decide continue issuing it,
thanks,
Lucky

[Lucibar Davalillo]

Distillation Design and Distillation Operation, both by Henry Z. Kister may help.
 
He has also a good paper ” What caused tower malfunctions in the last 50 years?” ; no sure if this link works..just try
http://www.nt.ntnu.no/users/skoge/prost/proceedings/distillation02/dokument/pl1.pdf
 
 
 
 

[Lucibar Davalillo]

I’m getting conflicting information on this; one non-US refinery consulted did not trace at all the fuel gas leaving the coker up to the amine system; a TX refinery traced it only until coker unit battery limit, and another nearby did full trace up to amine system. None report major corrossion issues, but for the ones traced and insulated, CUI is a long term concern.
 
I guess should pick the cheapest way…but isn’t it against corrosion’s theory?

[Lucibar Davalillo]

was it an elbow or T connection? how about the drain connection?
 
thanks
 

[Lucibar Davalillo]

Thanks
Lucky

[Lucibar Davalillo]

Thanks a lot!
 
Merry Christmas and Happy New Year to all Coking mates

[Lucibar Davalillo]

Typically particulates increase at lower rate due to higher residence time in the coker gasoil draw off tray; it is very common having filters plugging issues and high backwash frequency for the same reason; designs should be good to hold steady up to 350 wppm particulate content. However, this should be a temporary condition and everything should comeback to normal once raising rate.

[Lucibar Davalillo]

I share your thoughts…Thanks
 
However, my understanding is that the trend lately is to control both from the top. 
 
Does anybody have a different point of view or experience? 

[Lucibar Davalillo]

What’s the level of particulates? Are u doing size distribution and destillation as well?

[Lucibar Davalillo]

Thanks for the good information.
 
Any criteria or best practice for their location? I mean, something like: lower at 25% of normal coke level or coking cycle, mid at 50%, etc..?.
 
Thanks again,
Lucibar

[Lucibar Davalillo]

Perhaps we could exchange some more information and help improving my data with yours; if you agree, please contact me at luckydaval@yahoo.com
 
 
 
 

[Lucibar Davalillo]

First at all, please be aware that there is not a single value and following information is from my own experience developed chart. I have found that H2S wt% of total mass can be determined from 0.21 to 0.41 times Coker feed S(wt%); however it is not linear and only valid for a limited S(wt%) range of 3.3-4.1.
 
As an example, 3.5 wt% S in Coker feed would result in 0.28-0.30 times or about 1wt% total feed mass.
 
Hope this helps,
Lucky

[Lucibar Davalillo]

I have never experienced it in Delayed Cokers; in fact, I found it very rear in Delayed Cokers considering the high steam /HC ratio; it is more typical in Flexi /Fluid Cokers.
 
What’s your overhead temperature? Are you dropping lot of naphtha in your LGO?

[Lucibar Davalillo]

We have drained lot of water from coke condensate drum system right before getting ready for heating up the column; if you have one of those system, it may be the possible source of your problem.

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