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Emergency Shut Down Procedures For Distillation Column


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#1 JaiEdi

JaiEdi

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Posted 14 March 2021 - 06:46 AM

Hi 

 

I can't find any emergenncy shut down procedures that  would apply to distillation columns. Any general literature or advice on what these are? Specifically on the distillation columns in a deethanizer first Olefin plant. 

 

Other than use total reflux and a recycle line from the overhead of the columns that feeds the Compression stages, is there much else to do with the start up of this? 

 

Also based on what I have found there is not much on the start up procedures for the associated refrigeration cycle. Other than rate of cooling can be 50 deg C per hour and it would be turned on before the chilling train is initiated. Any advice? 



#2 Zauberberg

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Posted 15 March 2021 - 01:32 AM

If it is an emergency shutdown, like you said, then the setup is fairly straightforward:

  • Isolate the system with emergency isolation valves
  • Stop energy supply to the reboiler
  • Depressurize inventory to the flare

"Emergency" means complete cease of operations and subsequent release of hydrocarbon inventory to a disposal system.



#3 fallah

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Posted 15 March 2021 - 05:06 AM

If it is an emergency shutdown, like you said, then the setup is fairly straightforward:

  • Isolate the system with emergency isolation valves
  • Stop energy supply to the reboiler
  • Depressurize inventory to the flare

"Emergency" means complete cease of operations and subsequent release of hydrocarbon inventory to a disposal system.

 

As always, a comprehensive reply by Dejan; but i want to add one more point:

 

If emergency shutdown is due to fire case it's highly preferable to keep the inventory inside the column after depressurizing, at least, to postpone the column failure...






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