Highlights：
1、This low-purity oxygen-enriched ASU unit made by Shanghai LifenGas has achieved over 8,400 hours of stable and continuous operation since July 2024.
2、It maintains oxygen purity levels between 80% and 90% with high reliability.
3、It reduces comprehensive energy consumption by 6%–8% compared to traditional air separation systems.
4、The fully automated system ensures easy operation and provides a reliable gas supply of O2 and N2 with low maintenance requirements.
5、This project supports customers in enhancing efficiency, reducing emissions, and promoting sustainable development.
Cryogenic low-purity oxygen-enriched air separation unit (ASU) utilizes low-temperature separation technology to extract oxygen and nitrogen from the air through compression, cooling, and distillation processes, which is critical in oxygen enhanced combustion. These systems can produce low-purity oxygen adjustable between 80% and 93%, while simultaneously generating high-purity oxygen (99.6%), high-purity nitrogen (99.999%), instrument air, compressed air, liquid oxygen, liquid nitrogen, and other products. They are widely applicable across non-ferrous metal smelting, precious metal recovery, glass manufacturing, energy, and chemical industries.
Key advantages of this cryogenic low-purity oxygen solution include multi-product output, lower noise levels—especially in low-frequency ranges—and operational flexibility ranging from 75% to 105%, extendable to 25%–105% with dual compressor configuration. With a single-unit capacity of up to 100,000 Nm³/h, it offers 30% lower capital expenditure and 10% smaller footprint than VPSA systems of equivalent capacity, alongside reduced operating and maintenance costs.
A prime example of this advanced technology in practice is the low-purity oxygen-enriched ASU project tailor-made by Shanghai LifenGas for Ruyuan Xinyuan Environmental Metal Technology Co., Ltd. Since its launch in July 2024, the system has achieved over 8,400 hours of continuous stable operation, consistently maintaining oxygen purity between 80% and 90%, while reducing comprehensive energy consumption by 6%~8% compared to traditional air separation systems—truly achieving efficient and low-carbon operation.
By adopting advanced cryogenic processes and high-efficiency internal compression technology, integrated with intelligent control systems and energy-saving equipment, the system significantly reduces energy consumption per unit and improves gas production efficiency. Fully automated, easy to operate, and with low maintenance requirements, it provides customers with a continuous and reliable gas supply.
Today, this ASU has become essential infrastructure for Ruyuan Xinyuan, enhancing productivity and supporting emission reduction goals. It also features self-generated liquid products that can be used in backup systems, eliminating external procurement and improving supply reliability.
Shanghai LifenGas continues to empower industrial clients with sustainable and cost-effective gas supply solutions. Our larger KDON-11300 low-purity oxygen ASU for Guangxi Ruiyi’s oxygen-enriched side-blown bath smelting furnace is also operating stably.
Xiaoming Qiu
Operation and Maintenance Engineer
Xiaoming oversees project safety and integrated operations management. With extensive experience in cryogenic air separation systems, he identifies and resolves potential risks, supports equipment maintenance, and ensures the stable, efficient, and low-carbon operation of the oxygen production system.
Post time: Sep-24-2025
