The configuration of the internal pressure process of the air separation unit varies greatly according to the compression mode of the product, including the following aspects:
1. Air compressor and filter system: adopt domestic or imported machines equipped with domestic self-cleaning filters, and the booster is generally imported;
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; Molecular sieve + alumina double bed structure is adopted to prolong the service life of molecular sieve;
4. Refrigeration system: two domestic expanders, one for use and one for standby; Or an imported expander; Or one imported and one domestic expander;
5. Heat exchange system: high-low mixed domestic large plate type or high-low mixed imported large plate type or split type (low-pressure plate is made in China and high-pressure plate is imported), and supporting liquid pump for pressurization;
6. Main rectification system: sieve plate lower column (or packed column), regular packing upper column, plate fin multi-layer or falling film main cooling;
7. Argon production system: regular packed argon column, full rectification three column argon production;
8. Nitrogen pressure system: nitrogen penetration or nitrogen piston;
9. Instrument control system: domestic or imported DCS.
DEAR air separation plans the project scheme design to ensure that the customer's project is economical and reasonable.
