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Heater outlet line

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This topic contains 4 replies, has 3 voices, and was last updated by  Anonymous 12 years, 6 months ago.

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  • #4409

    Anonymous

    From: rambabu
    Date: 26 Jul 2004

    I 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.

  • #7894

    Anonymous

    From:
    Category: Safety
    Date: 07 Aug 2004

    Comments
    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.

  • #7893

    Anonymous

    From: Coker Squirrel
    Date: 04 Aug 2004

    As 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.

  • #6157

    Anonymous

    If you have a KBC heater programs you will be able to simulate this in conjuction with FRNC5.
     
    SMistry

  • #6152

    Lucibar Davalillo
    Participant

    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 

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