Synthetic ammonia industry: nitrogen is used as raw material, and oxygen is used for coal gasification.
Coal chemical industry: in coal-to-olefins, coal-to-methanol and other processes, oxygen is used as gasification agent and nitrogen is used as protective gas.
Ethylene cracking: nitrogen is used as purge gas and sealing gas for cracking furnaces to prevent air from entering and causing explosions.
Nitric acid production: oxygen is used for ammonia oxidation reaction, and nitrogen is used as diluent gas for tail gas treatment.
Fine chemicals: high-purity nitrogen is used as protective gas for reactors to prevent product oxidation or deterioration.
Process description
Air pretreatment: The air is pressurized by the compressor, and the precooling system is initially cooled and dehydrated, and then the molecular sieve adsorber is used to deeply remove impurities such as water, carbon dioxide, and hydrocarbons.
Cooling and liquefaction: The purified air is cooled by heat exchange with the low-temperature product gas through the main heat exchanger, and part of it is further refrigerated by the expander, and liquefied into liquid air at the bottom of the lower tower.
Distillation separation: Liquid air enters the distillation tower (including the lower tower, upper tower, and argon tower), and the lower tower initially separates oxygen-rich liquid air and liquid nitrogen; the upper tower is finely separated, and high-purity nitrogen is obtained at the top and high-purity oxygen is obtained at the bottom; the argon tower uses the distillate gas to extract argon.
Product output: The separated gas is reheated by the main heat exchanger, pressurized by the product compressor, and transported to the downstream device.
Process parameters
| Serial No. | Equipment | Motor Power (Rated Power) | Normal Working Condition Power (kW) | Voltage Level | Remarks |
|---|---|---|---|---|---|
| 1 | Raw Material Air Compressor | 808 | 780 | 10kV | |
| 2 | Circulating Air Compressor | 1470 | 1330 | 10kV | |
| 3 | Pre - cooling Unit | 55 | 41.9 | 380V | |
| 4 | Low - temperature Pre - cooling Unit | 75.4 | 75.4 | 380V | |
| 5 | Molecular Sieve Purification System | ||||
| Electric Heater | 126 | Average Use: 45 | 380V | One for use and one for standby, intermittent operation | |
| 6 | Expansion Unit | ||||
| Heater | 3 | 220V | Intermittent use | ||
| Oil Pump | 2.2×2 | 1 | 380V | One for use and one for standby | |
| 7 | Average Power Consumption of Air Separation System (Calculated by Auxiliary Power): 2273.3 kW |
FAQ
What gases can your air separation unit produce?
Our air separation unit can stably produce oxygen, nitrogen, argon and other gases.
What is the gas volume processed by the unit?
Our air separation unit can process a wide range of gas volumes, ranging from hundreds of cubic meters per hour to tens of thousands of cubic meters per hour, which can be customized according to your production capacity planning.
What is the energy consumption level of the unit?
Our air separation unit uses advanced core components such as turbine expanders and high-efficiency heat exchangers, combined with optimized process flows, and the unit product energy consumption is 8%~12% lower than the industry average.
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