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Platforming Fired Heater


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#1 mhamdi khaled

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Posted 16 November 2016 - 12:36 PM

Dears,
in the platforming unit the light naphtha coming from the first reactor with: T = 430 °c enter to the second section of the fired heater ( low part of radiant section) to get the energy and exit ( from the heighest level of radiant section) with T = 506 °c. the question is why the stream enter from the lowest part of radiant section ( not the heighest part).
note: cabin fired heater with horizental tubes and horizental burners (devided to three section).
thanx.

#2 Bobby Strain

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Posted 16 November 2016 - 05:36 PM

Why Not?



#3 Saml

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Posted 16 November 2016 - 11:10 PM

Probably piping. If the inlet to reactors is from the top and outlet from the bottom, it makes sense to simplify the piping by sending from bottom of reactor 1 to bottom of heater and from top of heater to top of reactor 2.



#4 mhamdi khaled

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Posted 17 November 2016 - 01:19 AM

boby,
normally the feed enter by heighest part of the radiant section because the skin points there is lower than meduim and low part.

#5 mhamdi khaled

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Posted 17 November 2016 - 01:39 AM

Saml,
thank you for your response, but why we don't respect the temperature distribution in the radiant section.




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