Method for liquefying high-low pressure nitrogen double-expansion natural gas

The invention discloses a method for liquefying high-low pressure nitrogen double-expansion natural gas, which comprises the following steps: compressing and cooling nitrogen gas, and then introducing the nitrogen gas into the pressurizing end of a low-pressure pressurizing machine for pressurizatio...

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Hauptverfasser:	HUANG RONG, HONG YANHONG, CHEN LONG, CHEN HAIDA, GE SHUIFU, FENG JINLIE, XU LIGUO, RUAN JIALIN, JIANG JILIN, TIAN SHUGUANG, YU FAJUN, LI FENGMING, GE HAOHUA, GE HAOJUN, REN ZHIJUN, HUANG XIAOWEN, XIANG YUNHUA
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE ORUNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL BLASTING CHEMISTRY COMBINED HEATING AND REFRIGERATION SYSTEMS FIRELIGHTERS FUELS FUELS NOT OTHERWISE PROVIDED FOR HEAT PUMP SYSTEMS HEATING LIGHTING LIQUEFACTION SOLIDIFICATION OF GASES LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS LIQUEFIED PETROLEUM GAS LUBRICANTS MANUFACTURE OR STORAGE OF ICE MECHANICAL ENGINEERING METALLURGY MIXTURES BY PRESSURE AND COLD TREATMENT NATURAL GAS PEAT PETROLEUM, GAS OR COKE INDUSTRIES REFRIGERATION OR COOLING SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BYSUBCLASSES C10G, C10K TECHNICAL GASES CONTAINING CARBON MONOXIDE WEAPONS
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Beschreibung
Zusammenfassung:	The invention discloses a method for liquefying high-low pressure nitrogen double-expansion natural gas, which comprises the following steps: compressing and cooling nitrogen gas, and then introducing the nitrogen gas into the pressurizing end of a low-pressure pressurizing machine for pressurization; after cooling the nitrogen gas to a temperature of between 30 and 45 DEG C by a second after cooler, introducing the nitrogen gas into the pressurizing end of a high-pressure pressurizing machine to obtain high-pressure nitrogen gas which is cooled to a temperature of between 30 and 45 DEG C by a first after cooler; introducing the cooled high-pressure nitrogen gas into a main heat exchanger, cooling the nitrogen gas and raw natural gas to a temperature of 70 DEG C below zero and 30 DEG C below zero by the low-pressure nitrogen gas at the outlet of a low-pressure expander, taking out a current of the nitrogen gas which is introduced into a high-pressure expander for expansion refrigeration and then is introduced