Do superheaters and boilers have the same conditions?
No - steam produced in a boiler may be sent through additional tubes in the firebox to increase it's temperature The superheated steam is dry (no Liquid water) and has a higher energy content.
The conditions are similiar on the combustion side of the boiler/superheater tubes as the 2000-3000 degree flue gas/fly ash runs through the boiler/SH passes, with the exception that in the boiler section the heat is transfered through the tube walls via radiation, whereas it is done via convection at the superheater. Inside the tubes, the steam generated at the boiler (the one I work with anyway) runs up to about 800 degrees F at 3500 psi while the steam at the SH is held to 1000 degrees F at 3500 psi. So, the difference isn't all too great so far as pressure and temperatures go. The major difference, as the name implies, is that the steam in the superheater is superheated, which is done to prevent steam from condensing back into water as it makes it's way through the turbine.
