Cryogenic air separation units (ASU)
The Single column cryogenic air separation uses cryogenic technology as its core. It compresses and cools the air and uses the difference in boiling points of each component to complete the separation in a single tower. It has a simple structure, small footprint, and low investment and maintenance costs. It is suitable for small and medium-sized gas usage scenarios and can produce oxygen and nitrogen of a certain purity. It is widely used in metal processing, chemical industry and other fields.
Oxygen purity:99.9% Nitrogen purity: 99.9999%
Technical Features
Oxygen output
50Nm3/h~30,000Nm3/h
Nitrogen output
300Nm3/h~60,000Nm3/h
Argon gas output
5Nm3/h~3,000Nm3/h
Air Separation Units Application
Electronics Industry
Chemical Industry
New Energy
Steel Plant
What is the core technology of a single-tower cryogenic air separation plant?
Low-temperature distillation technology: Utilize the different boiling points of various components in the air (such as oxygen, nitrogen, argon, etc.) to liquefy the air at low temperature, and then separate the different components in the tower through the distillation process, so as to obtain various high-purity gas products.
Refrigeration technology: Cool the air to a low temperature state through a refrigeration cycle system to liquefy it. Usually, equipment such as expanders are used to achieve expansion refrigeration of gas to provide the required low-temperature environment for air separation.
High-efficiency heat exchange technology: Through efficient heat exchangers, heat transfer between cold and hot fluids is achieved, so that the air is fully cooled before entering the distillation tower, and the cold of the low-temperature product gas is recovered at the same time, improving the energy utilization efficiency of the entire system.
Automation control technology: Through advanced automation control systems, the operating parameters of the equipment (such as temperature, pressure, flow, etc.) are monitored and accurately controlled in real time to ensure stable operation of the equipment and stable and reliable product quality.
Which is more energy-efficient: a single column cryogenic air separation unit or a double column cryogenic air separation unit?
Small air separation unit: For small cryogenic air separation processes, single-tower cryogenic air separation equipment is more energy-efficient, with energy savings of more than 20%. Because the air compressor isothermal efficiency of the small air separation unit of the double-tower process is low, the unit output cooling loss is large, and the amount of air used for expansion refrigeration is small, the turbocharging technology cannot be used, and the cooling capacity can only be increased by increasing the air compressor outlet pressure, and 85% of the air is throttled and decompressed to enter the lower tower, and the cooling efficiency is very low. When the single-tower cryogenic air separation equipment adopts the air nitrogen dual heat pump process, the air compressor outlet pressure is low, and 55% of the total air can be used for expansion refrigeration, which can not only achieve cooling balance but also produce a small amount of liquid products.
Large air separation unit: In large air separation units, the double-tower process can achieve cooling balance of the air separation unit and produce a small amount of liquid products when the air compressor outlet pressure is 5.6bar. Under the same conditions, the amount of liquid products in the single-tower cryogenic air separation equipment will reach 10%-15% of the oxygen production. If the single-tower cryogenic air separation equipment adopts an optimized process solution, such as setting the nitrogen condenser at the liquid air inlet, the outlet pressure of the nitrogen compressor can be reduced to 2.1 bar. At this time, the sum of the compression power consumption of the air compressor and the nitrogen compressor of the single-tower cryogenic air separation equipment is equivalent to about 95% of the compression power consumption of the air compressor in the double-tower process, and the amount of liquid products is slightly higher than that of the double-tower process.
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