Metallurgical Air Separation Units

 

Advantages and Features

High-Purity Gas Production

They are designed to produce extremely high-purity gases.Oxygen purities typically range from 99.9% to 99.999%, with some advanced units achieving even higher purities. High-purity oxygen is crucial in metallurgical processes such as steelmaking. In the basic oxygen furnace (BOF) ironmaking process, high-purity oxygen is blown into molten iron to oxidize impurities such as carbon, silicon, and phosphorus. The higher the oxygen purity, the more efficient and precise the oxidation reaction, resulting in higher-quality steel with fewer impurities.
Nitrogen purity can also be maintained at very high levels, typically reaching 99.999% or higher. High-purity nitrogen is used as a shielding gas in metallurgical operations.
Efficient and Energy-Saving Operation
These units are designed with advanced energy-saving technologies. Modern metallurgical air separation units typically utilize advanced heat exchange technologies, such as high-efficiency plate-fin heat exchangers. These heat exchangers efficiently transfer heat between different gas streams, reducing the unit's overall energy consumption.

Application Scenarios

 

Steelmaking Industry
During the Converter Furnace (BOF) steelmaking process, oxygen from the air separation unit is injected into the molten iron at a high flow rate. The oxygen reacts with carbon in the molten iron to produce carbon monoxide and carbon dioxide gases. This reaction not only helps reduce the carbon content in the molten steel but also generates a significant amount of heat, facilitating the smelting process. High-purity oxygen ensures a more complete and efficient oxidation reaction, thereby improving steel quality.
During the Ladle Furnace (LF) steelmaking process, nitrogen is blown into the molten steel in the ladle to uniformly agitate the steel. This agitation promotes uniform temperature and chemical composition distribution within the molten steel, enhancing refining efficiency and helping to remove inclusions and impurities.

 

FAQ

When customizing Metallurgical Air Separation Units, what determines the equipment's production capacity?

Production capacity is primarily determined by the customer's actual gas demand. Whether it's the low volume of a small metallurgical plant or the high volume of a large, integrated steel plant, we adapt the size of key components such as the compressor, turbine, and distillation column to ensure the equipment precisely meets the production needs of varying scales.

During the customization process, if the customer requires higher purity oxygen or nitrogen, is this possible? How will this affect the equipment?

Yes. Metallurgical Air Separation Units are capable of producing high-purity gases. If the customer requires even higher purity (e.g., oxygen purity exceeding 99.8% or nitrogen purity exceeding 99.999%), this can be achieved through optimization of the distillation process and upgrades to the purification system. This may result in a more complex equipment structure, requiring higher material and precision requirements for key components, and may also affect the equipment's energy consumption and manufacturing costs.

When customizing equipment, how does selecting different energy-saving technologies affect the equipment's operating costs and customization cycle?
Selecting advanced energy-saving technologies (such as high-efficiency plate-fin heat exchangers and optimized compression systems) can significantly reduce the equipment's long-term energy consumption and operating costs. However, this may increase initial customization costs due to the high manufacturing costs of these advanced components. Regarding customization cycles, using established energy-saving technologies generally does not significantly extend them. However, innovative energy-saving solutions may require more research and development and testing time, thus extending the cycle.

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