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Flash Vessel Sizing

steam generator blowdown

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#1 tizanidine


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Posted 08 March 2018 - 11:31 AM

Dear All,

I need to size a steam drum/ flash vessel aimed to handle the blowdown from a steam generator.


The inlet at the vessel is tangential to exploit the "cyclonic" effect for the water.


I would like to know the needed equations to size the "cyclone/drum"


Thank you in advance! :)

#2 Pilesar


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Posted 08 March 2018 - 12:35 PM

Consider a pre-engineered flash tank for steam. The overall cost may be cheaper since the engineering is in the price and the sizing has been tested in multiple industrial installations. See for example: http://www.spiraxsar...Information.pdf


You can design steam flash tanks yourself, of course, but I have always calculated much larger tanks when using standard vapor-liquid separator guidelines such as found in Chapter 7 of the GPSA Engineering Data Book. I think the separation criteria is different for steam than for process streams since you will always have condensate in the saturated steam lines which have traps anyway. So what if you get wet steam out the top of the tank? The economics for larger 'normal sized' flash tanks may not justify them. I have tried to back-calculate how the expert steam specialists get such small diameters for their steam flash tanks, but there must be some engineering principle I am not taking into consideration.


If you have tangential inlet in your design, expect wall erosion and include enough material in the target area to account for severe wear.

#3 breizh


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Posted 08 March 2018 - 06:34 PM





Consider this resource .



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