Universal Pressure Boiler

The original B&W boiler for supercritical applications was the Universal Pressure (UP®) boiler.

The original UP boiler design dates back to the mid-1950s when B&W provided the 125 MW advanced supercritical boiler for American Electric Power's Philo station. This pioneering boiler/turbine system, with advanced steam conditions of 4500 psi/1150F/1050F/1000F (31 MPa/621C/566C/538C), was the world's first supercritical system.

Supercritical technology is usually designed for systems with a capacity of 300 MW or larger, due to steam turbine considerations. The boiler design rapidly evolved to units as large as 1300 MW in the late 1960s. These boilers, nine of which are in operation, are among the largest capacity fossil fuel boilers in the world.

Design features:

Arranged with a natural circulation, water-cooled dry-bottom furnace, and superheater, reheater, economizer and air heater components - the Carolina design employs a horizontal convection pass and vertical pendant heat transfer surfaces.

Capacity, steam output:

 About 700,000 lb/h (90 kg/s) to a maximumthat may exceed 7,000,000 lb/h (880 kg/s).


 Subcritical, usually 1800 to 2400 psi (12.4 to 16.5 MPa) throttle pressure with 5% overpressure capability.

Superheater and reheater outlet temperatures:

 As required, usually in the range of 1000 to 1050F (538 to 566C).  


Pulverized coal.