In a subcritical plant, steam pressure is below 3200 pounds per square inch and temperature is below 1025 degrees Fahrenheit (550 degrees Celsius). Subcritical units have efficiencies of between 33% and 37%; i.e. between 33% and 37% of the energy in the coal is converted into electricity.
What is AUSC technology?
AUSC technology is designed to help power plants burn less coal for electricity production while reducing carbon dioxide (CO2) emissions.
What is the difference between supercritical and ultra-supercritical?
The difference between subcritical and ultra-supercritical technology is that the total amount of flue gas emitted from the ultra-supercritical plant is about 14 per cent smaller, and hence the capacity of the SO2 control device can be about 14 per cent lower, resulting in savings in investment and operating costs.
What is boiler efficiency?
Definition of Boiler Efficiency is “The percentage of the total absorption heating value of outlet. steam in the total supply heating value.” In other word, it is a rate how the boiler runs efficiently.
What is supercritical condition?
The supercritical condition of a steam-water cycle is a state at which its temperature and pressure are above its thermodynamic critical point, where the pressure of the steam water is 22.12 MPa, the temperature is 647.14 K, and the density is 324 kg/m3. … Density difference between liquid and vapor is zero.
How does a supercritical boiler work?
Rather than boiling water to produce steam and then using that steam to turn a plant’s turbine, a supercritical boiler operates at such high pressure (3,208 psi/221.2 bar or above) that the fluid matrix in it ceases to be liquid or gas. … This supercritical fluid turns the turbine that generates electricity.
What is boiler critical pressure?
The critical pressure is the vapor pressure of a fluid at the critical temperature above which distinct liquid and gas phases do not exist. … Any boiler that operates below the critical point is called a subcritical boiler, and one that operates above the critical point is known as a supercritical boiler.
What is ultra-supercritical technology?
Supercritical (SC) and ultra-supercritical (USC) power plants operate at temperatures and pressures above the critical point of water, i.e. above the temperature and pressure at which the liquid and gas phases of water coexist in equilibrium, at which point there is no difference between water gas and liquid water.
What is advanced ultra-supercritical technology?
Fourth is advanced ultra-supercritical pulverised coal technology that operates with critical temperature and critical pressure of water in range of 700-760 degrees and 350 bars and targets operating efficiency greater than 50%. …
Which device is used in thermal power plant to reduce the level of pollution?
Scrubbers are installed to remove sulfur dioxide from power plant flue gas. Scrubbers use sorbents in order to remove SO2. Already installed at most coal-fired boilers to remove SO2, this device also helps to remove part of the trace metals present in the flue gas.