The new 50t/d liquefaction equipment of Liuzhou Iron and Steel (Group) Co., Ltd. is designed and manufactured by Sichuan Air Separation Equipment (Group) Co., Ltd., which adopts the medium pressure belt freezer process. The nitrogen compressor is a combined type imported from COOPER Company of the United States. The compressor and liquid storage system are two large-scale low-temperature storage tanks of 500m3. The configuration of the whole set of liquefaction equipment is currently relatively advanced in China.
After the production device is started, the nitrogen gas from the raw material pipe network (the normal operation is condensed by the liquefaction device and the low pressure nitrogen gas is combined with the supplementary low pressure nitrogen gas) is pressurized to 0.3 MPa in the low pressure section of the combined nitrogen press, and then after the expansion machine The reheated nitrogen of the heat exchanger merges into the intermediate pressure section of the combined nitrogen press and is pressurized to 2.5 MPa and cooled, and then enters the supercharger driven by the expander, absorbing the work output by the expander, and simultaneously pressurizing . After the pressurized nitrogen gas is cooled, it enters the nitrogen liquefier E1 to exchange heat with the refluxing nitrogen gas. After the temperature is lowered to 260K, it is extracted from the middle of the nitrogen liquefier E1 and enters the low temperature freezer. The nitrogen temperature from the freezer is 245K. Then enter the nitrogen liquefier E1 and continue to exchange heat with the refluxing nitrogen to a temperature of 172K. Most of the nitrogen gas is about 9600m3/h, and the expander is exhausted. After expansion, it enters the nitrogen liquefier E1 as a reflux gas. After reheating, The cold box is sent out and enters the middle pressure section of the nitrogen press to start the next cycle.
The other part of the gas continues to exchange heat with the returning nitrogen in the nitrogen liquefier E1. The temperature of the liquid nitrogen nitrogen liquefier E1 is 102K, and then exchanges with the liquid nitrogen after throttling in the liquid nitrogen subcooler E2. After cooling, it is throttled to 0.03 MPa and enters the oxygen liquefier E3. The oxygen is liquefied in the oxygen liquefier and subcooled, and then pressurized to 0.25 MPa by the liquid oxygen pump 11, and then sent out to the cold box. The cold source of the liquid nitrogen subcooler E2 is provided by the partial cooling of the liquid nitrogen after the supercooling. After the partial liquid nitrogen is vaporized, it is also reheated by the nitrogen liquefier E1, and then the cold box is vented or enters the low pressure nitrogen pipe network. Nitrogen is sent out through the liquid nitrogen subcooler E2.
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