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Aqueous CO2 Storage 1
- Thread starter Shmulik
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Montemayor
Chemical
Shmulik:
I always design and try to maintain a maximum Liquid CO2 to vapor space in the tank of 85%. This "fill" ratio has proven its worth over the many years I spent with the CO2 industry. It allows for enough variation in saturated conditions and gives sufficent cushion for the vapor space.
I've used this standard even while producing high-pressure liquid CO2 and expanding it directly into the storage tank for its subsequent storage at 200 - 250 psig. The expanded vapors were separated within the vapor space and returned to process recycle. I also use this fill ratio on transport tanks as well. I've taken the ratio as high as 90% on large and well-instrumented plant storage tanks - but I always install redundant level alarms just in case, to be safe from an over-fill or a liquid return through the vapor balance lines.
You cannot afford an unexpected pressure relief device to go off on a liquid CO2 storage tank. If the valve sticks open with dry ice under the seat, the tank can relieve down to atmospheric pressure and the subsequent liquid/dry ice temperature within the tank resulting from the relief will damage the quality of the tank steel to the point that you will have to destroy it - a very, very expensive lesson to learn!
Art Montemayor
Spring, TX
I always design and try to maintain a maximum Liquid CO2 to vapor space in the tank of 85%. This "fill" ratio has proven its worth over the many years I spent with the CO2 industry. It allows for enough variation in saturated conditions and gives sufficent cushion for the vapor space.
I've used this standard even while producing high-pressure liquid CO2 and expanding it directly into the storage tank for its subsequent storage at 200 - 250 psig. The expanded vapors were separated within the vapor space and returned to process recycle. I also use this fill ratio on transport tanks as well. I've taken the ratio as high as 90% on large and well-instrumented plant storage tanks - but I always install redundant level alarms just in case, to be safe from an over-fill or a liquid return through the vapor balance lines.
You cannot afford an unexpected pressure relief device to go off on a liquid CO2 storage tank. If the valve sticks open with dry ice under the seat, the tank can relieve down to atmospheric pressure and the subsequent liquid/dry ice temperature within the tank resulting from the relief will damage the quality of the tank steel to the point that you will have to destroy it - a very, very expensive lesson to learn!
Art Montemayor
Spring, TX
Montemayor
Chemical
Shmulik:
In the previous post, I assumed you meant to say "saturated" CO2 - not "aqueous" CO2 (or carbonated water),
Art Montemayor
Spring, TX
In the previous post, I assumed you meant to say "saturated" CO2 - not "aqueous" CO2 (or carbonated water),
Art Montemayor
Spring, TX
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