Large Capacity Air Separation Unit

In the fields of modern metallurgy, chemical gas production, and energy equipment, the stable supply of gas is directly related to the continuous operation of production lines. The large capacity air separation unit is not only the core equipment for gas purification but also an important yardstick for measuring a country's industrial infrastructure capability.

The cryogenic air separation solution we provide is based on the principle of physical low-temperature separation. It utilizes the difference in boiling points of various components in the air (oxygen approx. -183°C, nitrogen approx. -196°C) through processes of compression, purification, heat exchange, and rectification to continuously produce high-purity oxygen, nitrogen, and argon. The entire system emphasizes thermodynamic efficiency and long-term operational reliability, making it particularly suitable for iron and steel smelting and large-scale coal chemical projects with huge gas demands.

Technical Principle and Process Flow

This large capacity air separation unit follows the classic "full low-pressure cryogenic" process flow:

1. Air Compression and Purification: Raw air enters the turbo compressor through a self-cleaning filter and is compressed to the required pressure. It then enters the purification system, where moisture, acetylene, and hydrocarbons are removed by molecular sieve adsorption, ensuring no freezing or blockage inside the subsequent cold box.
2. Heat Exchange and Refrigeration: The purified air enters a plate-fin heat exchanger for heat exchange with the returning low-temperature gas, cooling it to near the liquefaction point. Meanwhile, the turbo-expander provides the necessary cooling capacity for the process to maintain the cold balance.
3. Rectification Separation: The liquefied air enters the upper and lower rectification columns. Through repeated mass and heat transfer between the upper and lower columns, liquid oxygen is finally obtained at the bottom, liquid nitrogen at the top, and crude argon is extracted from the middle according to the configuration.
4. Product Delivery: The separated low-temperature liquid is pressurized by a liquid pump, enters a vaporizer for reheating, and is then sent to the plant pipe network or directly stored in vacuum-insulated storage tanks.

Technical Specifications and Performance Indicators

The following are the standard design parameters for this series of large capacity air separation unit. All data are based on ISO operating conditions and can be adjusted according to the user's actual power grid and climatic conditions.

Energy Consumption and Economic Analysis

For high energy-consuming industries, the operating cost of air separation equipment directly determines the profit margin of the final gas product. This series of large capacity air separation unit incorporates 3D flow field simulation technology during the design phase, optimizing the tray efficiency of the rectification column and the heat transfer temperature difference of the main condenser-evaporator.

• Compressor Unit: Optional high-efficiency Siemens or MAN turbo compressors, combined with aerodynamic optimization, reduce shaft power consumption.
• Molecular Sieve Process: Utilizes a long-cycle switching program to reduce the consumption of regenerative waste nitrogen, thereby increasing the effective air volume sent to the cold box.

Quality Standards and Compliance Certification

To ensure the absolute safety of the equipment under high pressure, low temperature, and potentially flammable environments, this product strictly adheres to international standards during design, manufacturing, and inspection:

• ISO 9001:2015 Quality Management System Certification.
• ASME Boiler and Pressure Vessel Code (U-Stamp certification traceable).
• GB/ISO Chinese and international general flange connection standards.
• All cryogenic pressure vessels undergo 100% radiographic inspection and helium mass spectrometer leak testing.

Industrial Application Scenarios

Our large-scale cryogenic air separation equipment is widely used in the following industrial fields:

• Metallurgy & Steel: For blast furnace oxygen enrichment, converter steelmaking, improving smelting efficiency and steel quality.
• Petrochemical: Providing feed gas for ammonia and methanol production, or as pipeline purging and shielding gas.
• Coal Chemical: Cooperating with gasification processes to provide large-scale, high-purity oxygen.

Customization Capabilities

We understand that not all industrial sites have identical conditions. For different altitudes, humidity levels, and product ratio requirements, we offer tiered customization:

• Gaseous/Liquid Oxygen Ratio: The extraction ratio of gaseous and liquid products can be adjusted based on electricity price differences between day and night, using off-peak power for energy storage to enhance life-cycle revenue.
• Rare Gas Extraction: A krypton/xenon extraction system can be added to the basic large capacity air separation unit to improve resource utilization.
• Integration Level: For projects with limited space, modular skid-mounted designs (cold box to cold box, cold box to heat exchanger) can be adopted to reduce on-site installation time.

Hangzhou Shenger Gas Equipment Co., Ltd. is dedicated to transforming complex cryogenic technology into stable, productive operations for our customers. From the fin arrangement of the core heat exchanger to the opening angle of the distributor inside the rectification column, we pay attention to every detail that might affect "long-term operation." If you are planning a new gas center or considering an energy efficiency upgrade for an old unit, we welcome you to connect with our technical department to discuss parameters and explore the optimal process route together.

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