Does \"supercritical\" in a power plant refer to the speed of the turbine?

This post was last edited by qugd on 2018-1-28 21:34. No, it refers to the temperature and pressure conditions of the steam used to do work. When the temperature of water exceeds 374 degrees and the pressure exceeds 22.1 MPa, water is neither in a liquid state nor a gas state; instead, it is in a state where its density is like that of a liquid while its viscosity is like that of a gas, which is known as the supercritical state. A thermal power plant can be regarded as a heat engine operating on a Carnot cycle; the power generation efficiency per unit weight of fuel is directly related to the temperature and pressure of the working medium. The higher the steam temperature, the greater the pressure, and the higher the power generation efficiency; the efficiency of supercritical units can reach around 50%. Look at the diagram below; if you have knowledge of thermodynamics and some physical chemistry related to water, you will be able to understand it:

Refers to the state of the working medium, which is water vapor

Obviously not! Supercritical refers to the parameters of steam! As for steam turbines, those used domestically all operate at 3,000 revolutions per minute, though there are also turbines that run at half that speed!