For decades, carbon dioxide (CO2) has been viewed primarily as a challenge—a greenhouse gas driving global climate change. However, a groundbreaking project in the Chinese mainland is shifting this narrative, transforming a climate liability into a source of clean energy.
In the mountainous city of Liupanshui, located in southwest China's Guizhou Province, a local steel plant has unveiled an answer to the energy efficiency puzzle. The facility is now home to Chaotan One, the world's first commercial-scale supercritical CO2 power-generation unit. This innovative system is designed to drastically improve power efficiency while slashing industrial emissions.
The significance of Chaotan One lies in its challenge to a century-old engineering standard. Since the dawn of the industrial age, most thermal and nuclear power plants have relied on steam to drive turbines. While effective, the traditional process of heating water into steam involves significant heat loss, limiting overall efficiency.
Chaotan One breaks this mold by utilizing supercritical CO2. By compressing and heating the gas beyond its critical point—31 degrees Celsius and 7.38 megapascals—the fluid enters a "supercritical" state. In this state, it possesses the density of a liquid but the flow characteristics of a gas, allowing it to move through turbines at high speeds with far greater efficiency than steam.
The results are striking. Project data indicates that this technology improves power-generation efficiency by more than 85% compared to conventional steam-based systems. Furthermore, the physical footprint of the necessary equipment has been reduced by half, allowing for more compact and cost-effective installations.
Beyond its internal efficiency, the system serves a dual purpose: sustainability. By capturing industrial waste heat from the steel plant that would otherwise escape into the atmosphere, Chaotan One converts waste into more than 70 million kilowatt-hours of electricity every year.
As the Chinese mainland continues to diversify its energy portfolio, projects like Chaotan One represent a critical piece of a larger technological mosaic, showcasing how industrial innovation can drive the transition toward a greener global future.
Reference(s):
China's Tech Mosaic: China's Chaotan One turns CO2 into clean energy
cgtn.com
