Process for the delivery of oxygen at a variable rate

Details Process for the delivery of oxygen at a variable rate Process for the delivery of oxygen at a variable rate

F - Mech Eng,Light,Heat,Weapons

25

J

F25J 3/04 (2006.01)

Patent

CA 2325309

A process delivers oxygen at a variable flow rate from a distillation system. The process uses a higher pressure column and a lower pressure column. The effects of oxygen product rate fluctuations on the distillation system are reduced by maintaining essentially constant flow rates within the columns. The process also utilizes a first storage vessel and a second storage vessel and includes the following features: liquid oxygen is withdrawn at a substantially constant rate from the distillation column system and at least a portion of the withdrawn liquid oxygen is directed to the second storage vessel; liquid oxygen is withdrawn from the second storage vessel at a variable rate and vaporized in a main heat exchanger against an incoming variable flow rate of air which is condensed to form a liquid air stream and then sent directly to the distillation column system; and liquid oxygen is withdrawn from the distillation column system from the same location where at least one of the liquid air streams is fed to the distillation column system, and at least a portion of the liquid air is directed to the first storage vessel during periods of higher than average oxygen delivery rate.

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