According to the influence and reform of the general environment of the non-ferrous industry, the problems faced by this industry are becoming more serious, and the control of production capacity is particularly important. Recently, the 4500/4500 type small air separation plant project signed with customers by DEAR air separation, through the trial run stage, all the technical indicators have reached or exceeded the design standard, and have been continuously sending nitrogen for several days, which has been well received by users.
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Solution advantages |
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This device uses molecular sieve purification, pressurized turbine expansion machine to supply cooling for the device. The choice of this process is safe, reliable and economic and reasonable. The main reasons are: 1. Good security The whole set of equipment has low operating pressure, simple process, high level of equipment safety, long switching cycle of molecular sieve system, longer service life of switching valve and reducing potential safety hazard. Main cooling (K1) extracts a large amount of liquid oxygen to ensure the possibility of the accumulation of hydrocarbon to the minimum. 2. High reliability A large amount of surplus nitrogen can be sent to the water cooling tower, which reduces the load of the water chilling unit, reduces the energy consumption of air separation and reduces the use cost, thus further improving the reliability of the unit. 3. Convenient operation and maintenance, simple craft |
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Product |
Output N m3/H |
Purity |
Outlet cold box pressure Mpa |
Temperature |
Note |
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Oxygen gas |
4500 |
≥99.6% O2 |
0.015 |
Normal temperature |
External compression to 2.5Mpa |
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Liquid oxygen |
150 |
≥99.6% O2 |
Inlet storage tank |
Saturated |
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Nitrogen gas |
4500 |
≤10ppmO2 |
0.008 |
Normal temperature |
Precooling system |
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Nitrogen gas |
4500 |
≤10ppmO2 |
0.008 |
Normal temperature |
External compression to 2.5MPa |
Note: measurement unit Nm3/H is measured at 0℃, 0.1013Mpa (A). It is called standard state quantity.
1.1 take oxygen and nitrogen at different times
1.2 Operation Cycle (interval between two big heating): ≥2 years
1.3 heating and cooling time of the unit :~ 36 hours
1.4 start-up time of the device (from the start of the expansion machine to the purity index of the oxygen product ):~ 40 hours
| Supporting unit | Unit |
| 1. Centrifugal air compressor | 1 Set |
| 2. Air precooling system | 1 Set |
| 3. Purification system | 1 Set |
| 4. Booster turbine expansion unit | 1 Set |
| 5. Distillation column system | 1 Set |
| 6. Oxygen compression system | 1 Set |
| 7. Nitrogen compression system | 1 Set |
| 8. Liquid storage system | 1 Set |
| 9. Instrument control system | 1 Set |
| 10. Electronic control system | 1 Set |
