Steel industry: oxygen is used for converter steelmaking and blast furnace oxygen-enriched blast; nitrogen is used for gas pipeline purging and steel rolling protection.
Chemical industry: oxygen is used for synthetic ammonia and methanol oxidation; nitrogen is used as an inert protective gas to prevent oxidation of the reactants.
Electronics industry: high-purity nitrogen and argon are used in lithography, thin film deposition and other links in chip manufacturing to avoid impurity contamination.
Medical industry: oxygen is used for respiratory support (oxygen cylinders, central oxygen supply systems).
Food industry: nitrogen is used for packaging of potato chips, beverages, etc. to isolate oxygen and prevent deterioration.
Energy industry: nitrogen is used for fracturing in shale gas mining; nitrogen is used to maintain pressure in LNG storage tanks.
Process description:
Air pretreatment: filtration and dust removal, molecular sieve adsorption to remove moisture, carbon dioxide and hydrocarbons, and purify the air.
Compression and refrigeration: The purified air is pressurized by the compressor, cooled and refrigerated by the heat exchanger and expander, and the air is liquefied.
Cryogenic distillation separation: Liquid air enters the upper and lower towers for distillation
·The lower tower initially separates oxygen-rich liquid air and liquid nitrogen;
·The oxygen-rich liquid air enters the upper tower for further separation, and high-purity nitrogen is obtained at the top of the tower and high-purity liquid oxygen is obtained at the bottom of the tower;
·The intermediate fraction enters the argon tower to separate argon.
Product output: Liquid oxygen, liquid nitrogen, and liquid argon are stored and output in gaseous or liquid form after vaporization and rewarming.
Process parameters
| Parameter | Value | Parameter | Value |
|---|---|---|---|
| Atmospheric Pressure | 100Kpa (A) | CO₂ | ≤400 ppm |
| Ambient Temperature | 32℃ | CH₄ | ≤5 ppm |
| Relative Humidity | 80% | C₂H₂ | ≤0.5 ppm |
| Altitude | 100m | Suspended Solids | ≤20mg/L |
| Atmospheric Oxygen Content | 20.95% O₂ | Cl⁻ | ≤300 mg/L |
| Annual Average Temperature | 19.3℃ | Petroleum Substances | ≤5 mg/L |
| Extreme Maximum Temperature | 43℃ | Acidity/Alkalinity | 7 - 8 |
| Extreme Minimum Temperature | -6℃ | Inlet Temperature | 32℃ |
FAQ
Can your company customize the device according to our specific working conditions?
Yes. For high-altitude scenarios, the air compressor pressure ratio and distillation tower pressure parameters will be optimized; for high-temperature environments, the cooling system will be upgraded.
What are the requirements for air intake conditions (such as humidity) of the air separation unit?
The intake air must meet the requirements of humidity ≤80% RH and hydrocarbons (such as methane) ≤5ppm.
What are the specific differences in energy consumption and purity between air separation units of different sizes?
Small PSA units have lower energy consumption, but the oxygen purity is usually 93%; large cryogenic distillation units have higher energy consumption, but the oxygen purity can reach more than 99.6%, which is more suitable for high-purity, large-scale demand scenarios.
Hot Tags: asu gas plant, China asu gas plant manufacturers, suppliers
