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 efficiency of ultra-supercritical boiler?

Ultra-supercritical steam conditions now use supercritical pressures up to 300bar with 600°C steam and reheat steam temperatures. This gives a net efficiency of 46%.

What is range of temperature in boiler?

The steam piping is directed through the flue gas path in the boiler furnace, an area in which the temperature is typically between 1,300 and 1,600 degrees Celsius (2,372 and 2,912 degrees Fahrenheit).

What is the working pressure of ultra-supercritical boiler in bar?

There is no definitive standard for ultra-supercritical steam conditions but they typically mean a steam temperature of greater than 600°C (593°C according to the OECD) and steam pressure in excess of 240 bar.

What is the steam pressure of an ultra supercritical boiler?

Current ultra-supercritical boilers are usually defined as those with a main steam pressure of greater than 27 MPa and a steam temperature of above 580 °C; this should increase to 40 MPa and 700 °C/720 °C in the near future (Fan, 2010). 5.2.2. Classification on the basis of steam-water circulation

Why do we need a b & w supercritical boiler?

B&W’s supercritical and ultra-supercritical boiler designs offer the flexibility and reliability to meet the most demanding steam generation needs of our customers. At supercritical pressures, steam turbine efficiency improves significantly compared to the typical subcritical cycle.

Can a boiler be used for a supercritical steam generator?

Only with high pressure steam, the high temperature steam can be converted more efficiently to mechanical energy in the turbine according to Carnot’s theorem . Technically, the term “boiler” should not be used for a supercritical pressure steam generator as no “boiling” actually occurs in the device.

What is the critical point of a subcritical boiler?

Subcritical boilers are boilers that work at temperatures up to 374°C and at a pressure of 3,208 psi (the critical point of water). These boilers compose a system with constant evaporation endpoint.