| 摘要 |
PROBLEM TO BE SOLVED: To provide a nitrogen manufacturing method and device capable of efficiently supplying product nitrogen. SOLUTION: The nitrogen manufacturing method comprises a first separating process of carrying out low temperature distillation of raw material air at a pressure of 0.8-1.1 MPa; a first indirect heat exchange process of carrying out indirect heat exchange between a first nitrogen gas and a first oxygen enriched liquefied fluid separated in the first separating process, to obtain a first liquefied nitrogen and a first oxygen enriched gas fluid; a second separating process of carrying out low temperature distillation of the first oxygen enriched gas fluid; a second indirect heat exchange process of carrying out indirect heat exchange between a second nitrogen gas and a second oxygen enriched liquefied fluid separated in the second separating process, to obtain a second liquefied nitrogen and a second oxygen enriched gas fluid; a cold generating process of adiabatically expanding the second oxygen enriched gas fluid to generate cold; a first product recovery process of leading out a part of the first nitrogen gas as a first product nitrogen gas; and a second product recovery process of leading out a part of the second nitrogen gas as a second product nitrogen gas after heat recovery. COPYRIGHT: (C)2006,JPO&NCIPI
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