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Cryogenic Air Separation Plant: A Leading Supplier of Industrial Gas Core Equipment
Cryogenic Air Separation Plant is an industrial system that uses cryogenic technology to liquefy air and, based on the differing boiling points of components such as oxygen and nitrogen, separates them through distillation to produce high-purity gases such as oxygen, nitrogen, and argon.
Product Specifications
| Specification | Typical parameter |
| Production capacity | Covering 300–8,000 Nm³/h, large-scale systems can reach 10,000 Nm³/h or more, and even exceed 120,000 Nm³/h. |
| Oxygen purity | ≥ 99.5% |
| Nitrogen purity | Typically 99.5% ~ 99.999% (5N); for certain high-purity applications, it can reach 99.9999% (6N). |
| Output pressure | Oxygen outlet pressure: 1.0–8.0 MPa; Nitrogen outlet pressure: 0.5–8.0 MPa. |
II.Product Features
| Industry | Key Features | Specific use cases |
| Metallurgical Industry | Large-scale oxygen supply | Oxygen-enriched combustion in the converter process, raises furnace temperatures and shortens smelting time. |
| Electronics/Photovoltaics | Ultra-high purity/clean | The protective gas used in chip manufacturing to prevent silicon wafers from oxidizing requires extremely high-purity nitrogen. |
| Chemical/Coal Chemical Industry | Feedstock gas/ Co-production | Coal-to-liquid and methanol synthesis processes require large amounts of oxygen as a gasification agent, as well as nitrogen purging. |
| Gas Company | Liquid Production / Rare Gases | Filling and sales of liquid oxygen, liquid nitrogen, and liquid argon, and extract high-value gases such as krypton and xenon. |
| Healthcare/Food | Health/Frozen | Liquid oxygen is used in emergency medical care, while liquid nitrogen is used in food flash-freezing and cold-chain transportation. |
Product Advantages
1. Massive Production Scale
Cryogenic air separation is the optimal solution for large-scale, continuous production. The capacity of a single unit can be easily scaled from several thousand standard cubic meters per hour (Nm³/h) to over 100,000 Nm³/h. For industries with massive gas consumption, such as steel and large-scale coal chemical processing, cryogenic air separation is virtually the only economically viable option.
2. Simultaneous Extraction of Multiple Components (Co-production Capability)
This is a unique advantage of cryogenic air separation technology. In addition to oxygen and nitrogen, it can efficiently extract argon (Ar) from air, as well as rare gases such as neon, helium, krypton, and xenon, all within the same unit. This co-production model significantly enhances resource utilization and the overall economic benefits of the project.
3. Low operating costs at large scales
Although the initial investment in Cryogenic Air Separation Plant is relatively high, under conditions of large-scale continuous operation, its production cost per unit of gas is the lowest among all available technologies. The larger the plant, the more pronounced the economies of scale become, and the more significant the economic advantages of long-term operation.
Case Show
1. Project Description
A set of 6000Nm3/h air separation unit for China Aviation Technology Corporation for its project in Turkey.
2. Performance Data
| Product | Output (Nm3/h) | Purity (vol%) | Pressure (MPa) | Remarks |
| Gaseous Oxygen | 6000 Nm3/h | O2 ≥99.6% | 3.0 | After oxygen compressor |
| Liquid Oxygen | 100 Nm3/h | O2 ≥99.6% | - | To storage tank |
| Gaseous Nitrogen | 2000 Nm3/h | ≤2ppm O2 | 1.6 | After nitrogen compressor |
| Liquid Nitrogen | 100 Nm3/h | ≤2ppm O2 | - | To storage tank |
| Liquid Argon | 200 Nm3/h | ≤2ppm O2 ≤3ppm N2 | 0.1 | To storage tank |
3. Process Flow Description
This air separation unit adopts a full-low-pressure process featuring molecular sieve adsorption purification, turbine expansion refrigeration, and full distillation for argon production. This design ensures the long-term stable and reliable operation of the air separation equipment. The design principles are safety, energy conservation, and ease of operation and maintenance.
The system includes: air filtration and compression system, air pre-cooling system, air purification system, air distillation system, product compression system, liquid backup system, instrumentation control system, electrical control system, etc.
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