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Decreasing The Pressure Of A Liquid Stream Before Distillation


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#1 chessboss

chessboss

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Posted 23 November 2017 - 08:06 AM

I'm designing a plant which has a 10.1 bar liquid stream to be throttled to 1.5 bar before it enters a distillation column with condenser pressure 1.1 bar and reboiler pressure 1.2 bar. The vapor fraction after the valve is 17.2%. I'm worried that this would damage the pipeline. Is such an operation acceptable if the valve is placed directly before the distillation column, just like a flash column?



#2 Padmakar Katre

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Posted 03 January 2018 - 02:18 AM

I'm designing a plant which has a 10.1 bar liquid stream to be throttled to 1.5 bar before it enters a distillation column with condenser pressure 1.1 bar and reboiler pressure 1.2 bar. The vapor fraction after the valve is 17.2%. I'm worried that this would damage the pipeline. Is such an operation acceptable if the valve is placed directly before the distillation column, just like a flash column?

 

Vapor quality of 0.2 is quite normal in case of feed to distillation column. The precaution you have to take is to keep minimum 2-phase flow length i.e. put the feed control valve close to column inlet. Also pay attention to the feed inlet device or spacing inside column for proper vapor liquid separation.






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