For over a century, thermal power plants have boiled water into steam to spin gigantic turbines. But in La Porte, Texas, engineers at NET Power and Toshiba have built a power plant with no steam and no smokestack.
Using the Allam-Fetvedt thermodynamic cycle, the plant burns natural gas with pure oxygen instead of nitrogen-rich air, producing only carbon dioxide and water.
That CO₂ is compressed above 300 bar (4,350 psi) and heated to 1,150°C until it enters a bizarre fourth state of matter: “supercritical CO₂,” which has the high density of a liquid but flows frictionlessly like a gas.
Because supercritical CO₂ is so dense, a turbine rotor the size of an office desk can generate 300 megawatts of electricity — a fraction of the size of a conventional steam turbine hall.
Even better, the working fluid loops in a closed circuit while excess pure CO₂ is tapped directly off the pipe ready for underground mineralization, capturing 100% of carbon emissions by design.
How wild is it that a turbine the size of an office desk can generate enough electricity for 300,000 homes?
See Also
New Concept - XII - Thermodynamic Misconception
Russells Laws of Thermodynamics
steam
The New Thermodynamics
thermodynamics
