Air Seperation Unit(ASU)

Short Description:

An Air Separation Unit (ASU) is a device that uses air as feedstock, compressing and super-cooling it to cryogenic temperatures, before separating out oxygen, nitrogen, argon, or other liquid products from the liquid air through rectification. Depending on the user’s needs, the products of the ASU can either be singular (e.g., nitrogen) or multiple (e.g., nitrogen, oxygen, argon). The system can produce either liquid or gas products to meet different customer requirements.

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Product Description

The air separation process is as follows: In the ASU, air is first drawn in and is passed through a series of filtration, compression, pre-cooling, and purification treatments. The pre-cooling and purification processes remove moisture, carbon dioxide, and hydrocarbons. The treated air is then split into two parts. One part enters the lower section of the fraction columns after heat exchange with the product oxygen and nitrogen is carried out, while the other part passes through the main heat exchanger and expansion system before entering the air separation columns. In the fraction system, the air is further separated into oxygen and nitrogen.

Technical Advantages:

• Advanced performance calculation software imported from abroad is used to optimize the process analysis of the equipment, ensuring superior technical and economic efficiency and excellent cost performance.

• The upper column of the ASU (main product O₂) uses a high-efficiency condensing evaporator, forcing liquid oxygen to evaporate from bottom to top in order to avoid hydrocarbon accumulation and ensure process safety.

• To ensure equipment safety and reliability, all pressure vessels, pipework, and pressure components in the ASU are designed, manufactured, and tested in strict accordance with relevant national regulations. Both the air separation cold box and the piping within the cold box are designed with structural strength calculation.

Other Advantages

• The majority of our company's technical team engineers come from international and domestic gas companies, with extensive experience in cryogenic air separation system design.

• With extensive experience in ASU design and project implementation, we can provide nitrogen generators (300 Nm³/h - 60,000 Nm³/h), small air separation units (1,000 Nm³/h - 10,000 Nm³/h), and medium to large air separation units (10,000 Nm³/h - 60,000 Nm³/h).

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