How does it work?
After being compressed and purified, the air is liquefied by low-temperature cooling (about -196°C), and then fractionated and purified in a distillation tower by using the difference in boiling points of each gas component (such as nitrogen boiling point is lower than oxygen).
Industrial Gas Supply (Steel, Chemical and Electronic Manufacturing)
Steel and Metal Production:
Oxygen enrichment in blast furnaces and basic oxygen furnaces (BOF) improves combustion efficiency and reduces carbon emissions.
Nitrogen inerting prevents oxidation in heat treatment processes and metal welding.
Chemical and Petrochemical Industries:
Used in ammonia synthesis, methanol production and oxidation reactions.
High purity nitrogen is used as a shielding gas in sensitive chemical processes.
Electronic Manufacturing:
Ultra-high purity nitrogen (≥99.999% purity) is essential for semiconductor manufacturing to prevent contamination during chip production.
Used in LED manufacturing, solar cell production and LCD panel processing.
FAQ
How does an ASU work?
An Air Separation Unit (ASU) works by compressing, cooling, and distilling atmospheric air into its primary components (oxygen, nitrogen, argon) using cryogenic fractional distillation. Key steps:
Air Compression → Purification (removes CO₂ & moisture) → Cooling to cryogenic temperatures (-185°C) → Separation in distillation columns → Product extraction (gas/liquid form).
What is TPD in an air separation unit?
TPD (Tonnes Per Day) measures an ASU's production capacity. Example:
A 100 TPD ASU can produce 100 tonnes of oxygen (or nitrogen) per day.
What is ASU in oil and gas?
In oil & gas, ASUs provide:
Oxygen for enhanced oil recovery (EOR) & gas processing.
Nitrogen for inerting pipelines & purging tanks.
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