Membrane-separation nitrogen preparation device

The invention discloses a membrane-separation nitrogen preparation device and relates to the technical field of nitrogen preparation. The membrane-separation nitrogen preparation device comprises an air compressor, a gas storage tank, a pressure-regulating valve, a primary filter, a freeze drying machine, a secondary filter, a tertiary filter, an air flowmeter, a heater, an inlet valve, a filtering membrane, a buffer tank and a nitrogen supercharger, and the above devices are orderly connected by pipes. An air pressure gauge and an emptying valve are installed on the gas storage tank, a nitrogen pressure gage is installed on the buffer tank, a thermometer and an inlet pressure gage are installed on the pipe between the heater and the inlet valve, and the emptying valve is installed on the pipe between the filtering membrane and the buffer tank. The membrane-separation nitrogen preparation device is convenient for operation, has short nitrogen discharge time, realizes automatic control easily, does not produce gas state change in separation, and has low energy consumption and less pollution.