Definition of supercritical/ultra supercritical power plant 1

[athomas236]

Gentlemen,

I am struggling to find a workable definition of the steam conditions supercritical and ultra supercritical power plant and would appreciate any assistance that can be offered.

I tend to think of supercritical as generally steam conditions of 250bar/570C/570C with maximum conditions of 270bar/580C/580C.

Ultra supercritical I think of as any plant with pressure above 300bar and steam temperatures above 600C/600C.

When suggesting these conditions, I am thinking about proven technology that is commercially available rather that something that may be available in 5 to 10 years time.

Best regards

athomas236

 

[metengr]

athomas236;
I would suggest that you obtain a copy of the paper from the International Joint Power Conference that was in 2000, the paper is available over the internet and is titled;

"Materials for Boilers in Ultrasupercritical Power Plants"
by R. Viswanathan and W. Baaker from EPRI

I have a copy of their paper and it provides a useful description of the evolving technology from supercritical to ultrasupercritical boiler design.

 

[athomas236]

Metengr,

Thanks for the advice. To my surprise I found a copy of the paper you mentioned.

After looking at various papers I have decided to call any plant above 275bar/565C/565C as ultra supercritical.

Regards,

athomas236

 

[taylorg]

Standard tables of thermodynamic properties of fluids (e.g the classic ones arranged by Rogers and Mayhew) show supercritical steam conditions starting at 225bar/350C. Rough rule of thumb is 221bar and above.
Where do you get 250bar/570C from?

 

[davefitz]

taylorg;

athomas is referring to the nominal throttle conditions as the HP steam enters the main steam line, and not discussing the min conditions needed to consider the fluid as supercritical.

 

[athomas236]

davefitz,

As ever you are correct, thanks.

regards,

athomas236

 

[unclesyd]

There is a lot of information on your subject at the following site. The site is a little convoluted, but worth the effort.

http://www.ornl.gov/sci/fossil/