According to the requirements of oxygen consumption, the configuration of the external compression process of the air separation unit supporting the metallurgical and chemical industries is as follows:
1. Air compressor and filtering system: domestic or imported machines equipped with domestic self-cleaning filters;
2. Nitrogen water precooling system: make full use of the cooling capacity of dry nitrogen, reduce the temperature of chilled water, and cancel the chiller (or with standby chiller);
3. Purification system: electric heating or steam heating, automatic switching; Double layer bed structure of molecular sieve+alumina is adopted to prolong the service life of molecular sieve;
4. Refrigeration system: 2 domestic expanders, 1 for use and 1 for standby;
5. Heat exchange system: domestic low-pressure plate;
6. Main distillation system: sieve plate lower tower or packing lower tower, regular packing upper tower, plate fin multilayer or falling film main cooling;
7. Argon production system: regular packing argon tower, full rectification three tower argon production;
8. Oxygen pressure system: domestic oxygen permeation or oxygen piston;
9. Nitrogen pressure system: nitrogen permeation or nitrogen piston;
10. Instrument control system: domestic or imported DCS.
Advantages of external compression process: low supporting requirements, low price of supporting units or valves, and low investment.
DEAR Air Separation has a professional technical team to provide customers with high-quality design services in air separation equipment construction projects.
