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LIN Subcooling Method for a Nitrogen Liquefier

IP.com Disclosure Number: IPCOM000019398D
Publication Date: 2003-Sep-12

Publishing Venue

The IP.com Prior Art Database

Abstract

It is generally desired that liquid nitrogen (LIN) leaving a nitrogen liquefier should be deeply subcooled. This is generally achieved by cooling it in a dedicated plate fin exchanger, against LIN boiling at close to atmospheric pressure. Typically the low pressure LIN is provided by flashing part of the product LIN into an LP separator and then thermosyphoning it through the subcooler. The subcooler can be either inside or external to the separator. A level controller is used to control the LIN flow supplied to the separator. The vaporized GAN can either be sent directly to the main liquefier exchanger, or it can first be superheated against the subcooling product LIN.