When water travels with crude, through furnaces into the crude tower, what process indications reflects on process parameters/tower profile?
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11/02/2015
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SHANKHANEEL BORAH, SUD CHEMIE INDIA PVT. LTD., shankhaneel@gmail.com
Furnace feed control valves will get open for lots of water with crude and in extreme case the furnace will trip for low flow.
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04/02/2015
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Bruce Carr, Suncor Inc, matukaze1@hotmail.com
If you know you have water passing through with your crude in addition to the answers already provided you would need to make sure your tower top temperature is kept higher otherwise you will experience sever corrosion in you top trays and overhead system. Calcium Chloride common in most crude combines with heat and water to form chloride salts and hydrolyze to form HCl (dew point ~220F).
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20/01/2015
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Eric Vetters, ProCorr Consulting Services, ewvetters@yahoo.com
In addition to what Sam indicated you would also see an increase in the valve opening on the overhead water from the accumulator. With a lot of water carryover to the crude column you might also see an increase in delta P across the trays due to the increased volume of vapor flow that occurs when all the water flashes. The amount of firing in the furnace to maintain outlet temperature would also increase with a lot of water carry over due to the high latent heat of the water and the increased vaporization that would occur when the steam formed reduces hydrocarbon partial pressure.
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19/01/2015
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sam lordo, Becht Engineering, salordo@comcast.net
if it is only a little bit of water you may see addition water going overhead of the crude tower or preflash tower,if it is a lot of water the preheat circuit could exhibit high pressures reducing flow rates, or the crude tower ovhd will over pressure , potentially lifting its safeties, or dislodging the trays
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19/01/2015
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Ralph Ragsdale, Ragsdale Refining Courses, ralph.ragsdale@att.net
The presence of water vapor reduces the temperature at which a hydrocarbon vaporizes. Therefore, if the water in the crude is removed, and if the furnace outlet and column draw temperatures are maintained, directionally the overhead and side product End Points will decrease. The quantity of vacuum column feed will increase. To offset those changes when the water is kept out of the crude, increase the temperatures.
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