Procurement of air separation equipment

The air cooling tower is the core equipment of the air separation precooling system, which is mainly used to cool and wash the high-temperature compressed air discharged from the air compressor, provide qualified low-temperature gas source for subsequent molecular sieve purification and cold box rectification, and ensure the stable operation of the whole unit. The air cooling tower adopts the countercurrent packing heat exchange structure, the tower is filled with high-efficiency packing, and the top is equipped with a spray device and a wire mesh demister. During operation, the high-temperature compressed air at 80 to 100 ℃ discharged by the air compressor enters from the bottom of the tower and flows from bottom to top; The cooling water is the normal temperature make-up water and the low-temperature chilled water prepared by the water-cooling tower, which is sprayed from top to bottom from the tower top, and the air and water are fully contacted in reverse for heat exchange. Under t

The air separation cold box is filled with insulation material, generally pearlite, and the pearlite particles are filled with air. After the operation of the air separation unit, the temperature of the insulation material and the air will decrease, and the volume will decrease. At this time, if the cold box is well sealed, negative pressure will be formed in the cold box, and the cold box may be compressed under the effect of internal and external pressure difference. If the cold box is not well sealed, the moisture outside the cold box will enter the cold box, making the insulation material damp, and the cold loss of the unit will be greatly increased. In order to prevent the cold box from being compressed and the thermal insulation material from becoming damp, dry nitrogen or crude nitrogen is usually filled into the cold box after the unit is running to keep the cold box at slightly positive pressure.