The configuration of the high purity nitrogen small air separation unit has the following aspects:
1、 Compressor unit configuration, for the reflux nitrogen plant, the compressor discharge pressure is generally 5-10bar. When the unit is large in scale and the product pressure is high, the product nitrogen compressor can be set separately; For the positive flow expansion nitrogen plant, when the scale is large, when there are many liquid products, a supercharger can be set separately to increase the nitrogen production and liquid products to meet the product requirements.
2、 Precooling system, raw air volume is 30000nm ³/ Air conditioning unit below h, with air volume of 30000nm ³/ H (i.e. 10000nm ³/ The nitrogen water precooling system is used for the above mentioned equipment.
3、 Expander, expansion capacity is more than 3000Nm ³/ h. It can be equipped with booster end, and the product nitrogen or feed gas can be pressurized at the supercharging end, with expansion less than 3000Nm ³/ h. Then the fan is used for braking without booster end.
4、 Fractionator, nitrogen production less than 20000nm ³/ For H unit, distillation is directly used in single tower, when the unit size is greater than 20000nm ³/ When h, it is necessary to consider the use of double tower distillation unit for investment recovery comparison; For distillation tower, the lower the working pressure, the higher the distillation efficiency, but the diameter of the tower will increase.
At present, the gas separation industry is developing towards high purity, refinement, cutting-edge, etc. with the progress of science and technology and the improvement of national production level, more and more demand for ultra-high purity oxygen, ultra-high purity nitrogen and high purity rare gas is increasing, and the specification requirements are also higher and higher.
DEAR Air Separation is suitable for the market. Inorder to improve and develop, bold R & D and scientific and technological innovation can not only meet the needs of users' products, but also improve the comprehensive competitive power of gas separation industry.
