Metallurgical industry: high-purity oxygen is used for converter steelmaking; high-purity nitrogen is used for inert protection in the steel rolling process .
Electronic industry: ultra-high purity nitrogen is used for inert environment of chip lithography and packaging; ultra-high purity argon is used for plasma etching to prevent impurities from affecting chip performance.
Chemical industry: high-purity oxygen is used for ethylene oxide synthesis; high-purity nitrogen is used as a protective gas to prevent catalyst oxidation.
Medical field: More than 99.5% of medical oxygen is used for intensive care, and impurities such as CO and moisture need to be removed to avoid lung damage in patients.
Aerospace: liquid oxygen is used as rocket propellant oxidant, and liquid helium is used for low-temperature superconducting equipment in spacecraft.
Process description
Air pretreatment: compress the air and cool it, and remove moisture, carbon dioxide and hydrocarbons through the purifier (to avoid freezing or explosion at low temperatures).
Cooling and liquefaction: the purified air exchanges heat with the low-temperature product gas through the main heat exchanger, and the air is cooled to a temperature close to the liquefaction temperature by combining with the adiabatic expansion of the expander to generate cold.
Distillation separation:
·The air enters the double tower (lower tower + upper tower), and through multiple evaporation-condensation, the lower tower separates oxygen-rich liquid air and pure liquid nitrogen;
·The upper tower is further distilled, and high-purity nitrogen is obtained at the top of the tower and high-purity oxygen is obtained at the bottom of the tower;
·If high-purity argon is required, an argon tower is added to extract crude argon from the main tower, and pure argon is obtained after removing oxygen and nitrogen.
Process parameters
| Product Name | Production Capacity (Nm³/h) | Purity (V/V) | Outlet Pressure (MPa(G)) | Remarks |
|---|---|---|---|---|
| Liquid Oxygen | 1500 | ≥99.6% O₂ | To Storage Tank | Continuous |
| Liquid Nitrogen | 300 | ≤3ppm O₂ | To Storage Tank | Continuous |
| Liquid Argon | 40 | ≤1.5ppm O₂, ≤4ppm N₂ | To Storage Tank | Continuous |
FAQ
What is an Air Separation Unit ?
An Air Separation Unit (ASU) is an industrial facility used to separate atmospheric air into its main components (i.e. nitrogen, oxygen, and in some cases argon and other noble gases).
What is an ASU for Nitrogen Production?
Air Separation Units are designed to produce liquid or gaseous oxygen, nitrogen and argon from atmospheric air.
What is an Air Separation Unit Oxygen Nitrogen?
Cryogenic air separation units are used to provide nitrogen or oxygen, and often produce argon simultaneously.
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