| 摘要 |
PROBLEM TO BE SOLVED: To provide a device for producing nitrogen gas, that is small enough to transport without causing inconveniences during transportation and easy to construct at an installation site. SOLUTION: The device for producing nitrogen gas 1 to be used for a deep cold air separation method comprises a first vacuum insulating cold box 2 storing a main heat exchanger 10, a second vacuum insulating cold box 3 storing a first rectifier 11, and a normal pressure insulating cold box 4 storing an expansion turbine 33. The normal pressure insulating cold box 4 is arranged under the first vacuum insulating cold box 2, and the main heat exchanger 10 and the first rectifier 11 are connected to each other via pipes 40, 44, 50 passing through the normal pressure insulating cold box 4. COPYRIGHT: (C)2007,JPO&INPIT
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