A device and method for cryogenic separation and purification of nitrogen and liquid nitrogen
A cryogenic separation, liquid nitrogen technology, applied in refrigeration and liquefaction, liquefaction, solidification and other directions, can solve the problems of high energy consumption, complex operation, not easy for users to operate, etc., to achieve low energy consumption, simple operation, small footprint small effect
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Embodiment 1
[0026] A device for cryogenic separation and purification of nitrogen and liquid nitrogen, such as figure 1As shown, it includes an air compression system 1, an air precooling system 2, an air purification system 3 and a fractionation tower system 4, and the fractionation tower system includes a main heat exchanger 7, a booster end 5 of a turboexpander, a turboexpansion Expansion end 8 of machine, single-stage rectifying tower 9, liquid nitrogen subcooler 11; Described air compression system is connected with air precooling system by first pipeline 101, and described air precooling system is connected with air precooling system by second pipeline 102 The air purification system is connected, the air purification system is connected to the third pipeline 103, the third pipeline is connected to the fourth pipeline 104 and the fifth pipeline 105, and the fourth pipeline is connected to the single-stage rectification system through the main heat exchanger. At the gas inlet of the ...
Embodiment 2
[0029] A method for cryogenic separation and purification of nitrogen and liquid nitrogen, the method comprising:
[0030] 1) The raw material gas is air, and the air is first compressed by the air compression system 1. After compression, the pressure is 0.48Mpa and the temperature is 100°C. The gas enters the air precooling system 2 through the first pipeline 101 for cooling, and is cooled to 8~17°C. The cooled gas enters the air purification system 3 through the second pipeline 102, and after the air purification system absorbs water, carbon dioxide and some hydrocarbons, enters the fractionation tower system 4 through the third pipeline 103, and the gas entering the fractionation tower system is divided into Two parts: a part of the gas enters the supercharging end 5 of the turboexpander through the fifth pipeline 105, and then is sent to the cooler 6 through the sixth pipeline 106, and then passes through the seventh pipeline 107 in the main heat exchanger 7 after being coo...
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