Working principle
It is a core technology for large-scale, high-purity oxygen production in the industrial sector. Its working principle is based on the physical property that different components in air have different boiling points, achieving separation through cryogenic distillation. During system operation, ambient air is first filtered and then enters the air compressor, where it is compressed to the pressure required for the process. Subsequently, the compressed air enters the pretreatment system, where moisture, carbon dioxide, and trace impurities are effectively removed through molecular sieve adsorption, preventing them from freezing and clogging equipment in the low-temperature environment.
The purified air undergoes a thorough countercurrent heat exchange with the reflux cryogenic product gas in the main heat exchanger, gradually reducing its temperature to approximately -170°C or below, and partially liquefying under the action of an expander. The liquefied air then enters the distillation column system, where oxygen and nitrogen are efficiently separated through multi-stage gas-liquid contact and repeated evaporation and condensation in the high-pressure and low-pressure columns. Nitrogen is mainly enriched at the top of the column, while oxygen is enriched at the bottom, and can be output in liquid or gaseous form as needed.
This process is highly continuous and stable in operation, and the oxygen purity can reach over 99%, making it suitable for industries such as steel, chemicals, energy, and large-scale centralized oxygen supply.
1. Iron and Steel & Metallurgical Industry
Used in oxygen-enriched combustion and oxygen blowing processes in blast furnace ironmaking, converter steelmaking, and non-ferrous metal smelting, significantly improving combustion efficiency, shortening smelting cycles, and reducing energy consumption.
2. Chemical and Petrochemical Industry
In processes such as ammonia synthesis, methanol production, ethylene oxide production, acetylene production, and oxidation reactions, cryogenic oxygen production units can provide high-purity, stable-flow oxygen to meet the needs of continuous production.
3. Energy and Coal Chemical Industry
Widely used in coal gasification, IGCC, oxygen-enriched combustion power generation, and hydrogen production, it is a key supporting unit for large-scale energy and chemical projects.
4. Medical and Liquid Oxygen Supply
Used for centralized liquid oxygen (LOX) production and storage, providing highly reliable oxygen source support for hospitals, medical oxygen stations, and district oxygen supply networks.
How is a cryogenic oxygen production unit customized for different industries?
Customization begins with the application industry and process demand. For steel and metallurgy projects, the system is optimized for large oxygen flow and continuous operation. In chemical and energy industries, higher oxygen purity and process stability are prioritized. Medical and industrial gas supply projects focus on liquid oxygen output and storage integration. Based on the industry, the unit configuration, column design, and product handling method are tailored accordingly.
Can the system be customized to supply both gaseous and liquid oxygen?
Yes. Cryogenic oxygen production units can be designed for gas-only, liquid-only, or combined gas–liquid supply. For on-site consumption, gaseous oxygen pipelines are prioritized, while surplus capacity can be converted into liquid oxygen for storage or transportation. This flexible product configuration improves overall utilization and ensures supply security during peak demand or emergency conditions.
How is production capacity customized for large-scale or expanding projects?
Capacity customization is based on current peak demand, operating hours, and future expansion plans. For large industrial or energy projects, the unit is designed with capacity margins and modular scalability. Additional compressors, cold box modules, or storage tanks can be added later without shutting down the entire system, allowing smooth expansion as production increases.
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