Air Separation Unit

The core process of an air separation unit (ASU) revolves around the efficient separation of air, encompassing five key steps. First, intake and compression: atmospheric air is drawn in and compressed to a pressure of 5-10 barg. This increased pressure improves subsequent cooling efficiency. Next, the purification stage utilizes molecular sieve adsorbers to remove impurities such as water, carbon dioxide, and hydrocarbons. This is crucial for preventing icing and blockage in cryogenic equipment. The purified air enters the cooling and liquefaction stage, where it is cooled to extremely low temperatures using heat exchangers and refrigeration cycles to liquefy. Distillation (rectification) is the core separation step, utilizing the boiling point differences between nitrogen (-196°C), oxygen (-183°C), and argon (-186°C) to separate the components in a distillation column. Finally, gas collection allows the separated gases to be stored and distributed as needed. In addition to the mainstream cryogenic distillation method, other methods include membrane separation (suitable for nitrogen-enriched air production), pressure swing adsorption (PSA), and vacuum pressure swing adsorption (VPSA). Purity, recovery rate, and energy consumption must be prioritized during design and operation to maximize overall plant efficiency.

 Applications

01.

Air Separation Plants For Metallurgical Processes

cryogenic air separation  offer significant advantages in the metallurgical industry. In steelmaking, high-purity oxygen improves combustion efficiency in converters and electric arc furnaces, accelerating the smelting process and enhancing molten steel quality. Nitrogen, used as a shielding gas in heat treatment, prevents steel oxidation and ensures product performance.
For non-ferrous metal smelting, such as aluminum and copper processing, the inert gas provided by ASUs creates an oxygen-free environment, preventing oxidation and deterioration during smelting, thereby ensuring the purity and processing properties of non-ferrous metals.

02.

Air Separation Units Of Oil & Gas Extraction Operations

 

Oil production: Air separation units (ASUs) provide high-purity oxygen and other gases to meet oxidation and combustion requirements during oil production. In complex, high-risk mining environments, a stable supply of industrial gases ensures efficient production, contributing to improved efficiency and safety.

Natural gas production: The high-purity gases provided by ASUs are crucial for natural gas production. The oxygen and other gases they supply are tailored to the production process and play a role in drilling, gathering, and transportation. This ensures stable operations in high-risk environments and provides a key guarantee for the smooth progress of natural gas production.

 

The fractionator, as the core distillation equipment in an air separation unit, performs the crucial function of air separation. It comprises core components such as the main heat exchanger, upper column (structured packing type), lower column (sieve plate type), main condenser/evaporator, crude argon column, and refined argon column. Through the distillation process, it directly produces target products such as liquid oxygen, liquid nitrogen, and liquid argon. It is the core of air separation and determines product yield and purity.

Feed Air Compressor (Centrifugal)
Responsible for compressing feed air to the required process pressure (inlet/outlet pressure ~0.1/0.61 MPa (A)), providing the initial air source power for the entire unit. With a processing capacity of approximately 8400 Nm³/h, it serves as the primary power source for air entering the subsequent pre-cooling, purification, and distillation systems, directly impacting the unit's air intake and stable operation. The circulating air compressor (centrifugal type) is a key component of the booster expander process. It provides high-pressure air (exhaust pressure ~2.8 MPa (A)) to drive the booster turboexpander, providing cooling capacity for the system and ensuring the establishment of a cryogenic distillation environment. With an air processing capacity of approximately 16,000 Nm³/h and a shaft power of 1,330 kW, it is crucial for maintaining cooling balance and stable operation of the system.

cryogenic air separation plant EPC & Turnkey Solutions:

 

Leveraging our expertise in gas engineering and our resource integration capabilities, NEWTEK offers EPC (Engineering General Contracting) and turnkey engineering solutions for a wide range of industries, including textiles, metallurgy, and chemicals. NEWTEK provides comprehensive EPC (Engineering General Contracting) services and turnkey engineering solutions, from project launch to operation. We address communication, interface, and coordination challenges in large and complex industrial projects, ensuring efficiency, professionalism, and peace of mind. We help ensure on-time delivery and reliable operation from project launch to operation, providing a one-stop, worry-free experience.

Case

Air Separation Unit With Capacity Of 90,000 M³/h

150nm3/h Air Separation Plan

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