Home › Forums › Coking › Technical › Heaters & Furnaces › Heater outlet line
This topic contains 4 replies, has 3 voices, and was last updated by Anonymous 13 years, 9 months ago.
-
AuthorPosts
-
August 17, 2004 at 12:05 am #4409
AnonymousFrom: rambabu
Date: 26 Jul 2004I am rambabu, from Reliance Industries Limited, Refinery division, India, Working as a process engineer in Delayed Coker. We are planning to go for expansion of coker from 150 KBPSD to 170 KBPSD. This question is regarding coker heaters. Is there any velocity / pressure drop / residence time criteria for the heater outlet line to coke drums? Ph (O): 0288-3010510
Transferred from the Coking.com Discussion on August 16, 2004 by the Coking.com administrator.
-
August 17, 2004 at 12:06 am #7894
AnonymousFrom:
Category: Safety
Date: 07 Aug 2004Comments
The more you push thru the transfer line from the heater to the drum the greater the pressure drop. The greater the pressure drop the higher the pressure in upstream of the drum i.e. the heater tube. When the pressure is high in the transfer line and the heater tube this causes the velocities to go down and the residence time to go up and finally as the residence time goes up the coking in the tubes/transfer line goes up. Now there is an equalibrium that is reached with this -> as the DP goes up the back pressure goes up and the vel go down which then causes the DP to go down – a new equalibrium is reached.Transferred from the Coking.com Discussion on August 16, 2004 by the Coking.com administrator.
-
August 17, 2004 at 12:07 am #7893
AnonymousFrom: Coker Squirrel
Date: 04 Aug 2004As a rule of thumb, 6′ per second per coil is minimum flow velocity. Don’t know the velocity of the hater outlet line.
Transferred from the Coking.com Discussion on August 16, 2004 by the Coking.com administrator.
-
April 14, 2009 at 3:47 pm #6157
AnonymousIf you have a KBC heater programs you will be able to simulate this in conjuction with FRNC5.
SMistry -
April 15, 2009 at 7:00 pm #6152
In cokers always pay giving up something to increase throughput; it has been my way of running cokers. If heaters safety limits are not exceeded, then go for it. Typically Coke drums are the limitations, especially in latest designs where overdesign hardly gets to 110%. Also feedstock is getting worse and most likely will eat that extra 10%.
In summary, make sure maximizing your heaters and everything else, but watch closely your drums; you will recover faster from heater tubes fouling and even plugging, but coke drum foamover would be a killer.
Just my thoughts..
Lucky -
AuthorPosts
You must be logged in to reply to this topic.