Asu Unit

ASU unit, or air separation unit, is a key equipment for converting air into industrial gases such as oxygen, nitrogen, and argon. It uses air as raw material, first boosts the pressure through a compressor, then passes through a molecular sieve purifier to remove impurities such as moisture and carbon dioxide, then deep cools in the main heat exchanger, and finally enters the distillation tower for separation. With advanced low-temperature distillation technology, it can produce high-purity gas products to meet the stringent gas requirements of different industries. The equipment can be customized according to customer needs, ranging from tens of cubic meters per hour to tens of thousands of cubic meters. Its modular design is not only easy to install, but also convenient for later maintenance.

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Description

Technical Parameters

Importance of ASU unit

In the steel industry, the pure oxygen provided by ASU unit is used in blast furnace ironmaking, which can improve iron production and quality and reduce energy consumption; in the chemical industry, the oxygen and nitrogen it produces are key raw materials for many chemical reactions, ensuring smooth production; in electronic manufacturing, high-purity gases are used in processes such as chip manufacturing to ensure product quality; in the medical industry, high-purity oxygen is a necessity for saving lives and maintaining respiratory treatment. Therefore, ASU unit plays an indispensable role in industrial production and social life.

ASU Unit

ASU Process

Air compression

Use multi-stage centrifugal/reciprocating compressors to pressurize ambient air to 0.6-1.2MPa, "accumulate power" for subsequent processes, and build a power foundation for gas separation.

Air purification

The compressed air flows into the molecular sieve adsorber to accurately screen out impurities such as moisture, carbon dioxide, and hydrocarbons, avoid impurities freezing and blocking equipment at low temperatures, and protect the smooth operation of the system.

Deep refrigeration

The purified air first enters the main heat exchanger, exchanges heat with the low-temperature reflux gas, and cools to near liquefaction temperature; then expands through the expander to further cool the air to convert it into a liquefied state.

Distillation separation

The liquefied air enters the distillation tower, and uses the boiling point difference between oxygen and nitrogen to separate the components through multiple partial evaporations + condensations, producing high-purity industrial gases such as oxygen and nitrogen.

FAQ

1. Can the gas output purity of ASU equipment meet the standard stably?
ASU adopts precise distillation control technology and is equipped with an online purity monitoring system to control the temperature, pressure and reflux ratio in the distillation tower in real time. As long as the cleanliness of the raw air meets the pretreatment standards, the oxygen purity is stable at 99.5%+ and the nitrogen purity is 99.999%+, which can adapt to high-purity demand scenarios such as electronics and medical care.

2. Is the energy consumption of the equipment high? How to control the later operating costs?
Advanced ASU uses a full low-pressure process + high-efficiency heat exchanger, combined with an intelligent variable frequency compressor, which reduces energy consumption by 15% - 20% compared with traditional equipment. And through the remote operation and maintenance system, the operating parameters can be dynamically optimized to reduce ineffective energy consumption; at the same time, the standardized design of wearing parts (such as molecular sieves) can reduce the cost of spare parts replacement, making long-term operation more economical.

3. Our production line demand is changeable, can the equipment flexibly adjust the gas volume?
The equipment supports flexible adjustment under multiple working conditions. Through the DCS control system, the gas production rate can be smoothly adjusted within the designed range (such as 30% - 110% load). With the storage tank buffer, it can not only meet the peak gas demand, but also save energy and standby at low load, which is suitable for fluctuating gas demand scenarios in industries such as chemical and steel.

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