Vertical Tube Universal Pressure Boiler

While the spiral wound furnace (SWUPTM) boiler meets today's market needs for variable pressure operation, B&W is continuing the research and development of advanced supercritical boiler designs, including a vertical tube universal pressure(VTUPTM) boiler.

The ideal furnace design would have vertical tubes and be capable of variable pressure operation over the load range while exhibiting natural circulation flow characteristics (flow increasing as heat absorption increases), thus protecting the tubes from overheating.

The supercritical steam cycle provides an improvement in heat rate (efficiency) as compared to the subcritical steam cycle. Additional gains in efficiency are possible as the cycle temperature and pressure are further increased.

Research continues in tube materials to develop higher efficiency boiler and turbine systems.



Design features:

A once-through boiler for supercritical applications, usually applied to systems with a capacity of 400 MW or larger; the design features a water-cooled dry-bottom furnace, superheater, reheater, economizer, and air heater components designed for both base load and full boiler variable pressure load cycling operation as well as on/off cycling operation.

Capacity, steam output:

From 2,000,000 lb/h (252 kg/s) to more than 10,000,000 lb/h (1260 kg/s).

Operating pressure:

Usually at 3500 psi (24.1 MPa) throttle pressure with 5% overpressure; higher pressures available.

Superheater steam temperatures:

As required, currently in the 1100F (595C) range.


Pulverized coal. ​