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Pumped Liquid Nitrogen (LIN) Expansion

IP.com Disclosure Number: IPCOM000019391D
Publication Date: 2003-Sep-12
Document File: 1 page(s) / 30K

Publishing Venue

The IP.com Prior Art Database

Abstract

Liquid nitrogen is withdrawn from the High Pressure column, pumped to elevated pressure and vaporized, along with the boiling oxygen. The pressure of nitrogen vaporization is such that the condensed air pressure can optimally be the same as that used to boil the oxygen. The nitrogen vapor resulting from the vaporization is warmed, then turboexpanded to product delivery pressure and provides refrigeration.

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Pumped Liquid Nitrogen (LIN) Expansion

Liquid nitrogen is withdrawn from the High Pressure column, pumped to elevated pressure and vaporized, along with the boiling oxygen. The pressure of nitrogen vaporization is such that the condensed air pressure can optimally be the same as that used to boil the oxygen. The nitrogen vapor resulting from the vaporization is warmed, then turboexpanded to product delivery pressure and provides refrigeration.

The near exclusive use of pumped-LOX to produce pressurized oxygen has created a synergistic opportunity of employing pumped-LIN to produce pressurized nitrogen. The synergy lies in the use of the same air booster compressor for both pumped-LOX and pumped-LIN. In order for the pumped-LIN/pumped-LOX to be carried out most efficiently with a single booster air pressure, there must be a unique ratio of GAN pressure to GOX pressure (generally in the range of 1.5 to 3.0, depending on GOX pressure).

In the event that the customer’s desired pressure ratio does not coincide with this “efficient” ratio, one normally has three options: 1) use two air pressures, 2) use one air pressure and employ partial pumped-LOX plus a GOX booster, or employ partial pumped-LIN and add a GAN booster, or 3) use one air pressure, no supplemental product compression, and take the efficiency penalty. The object of this invention is to provide a fourth option.

In the common case where the desired GAN/GOX pressure ratio is less than the efficient GAN/GOX ratio...