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. Ultra-supercritical steam conditions provide even greater efficiency improvements. The combination of utilizing supercritical throttle pressures along with an increase in throttle temperatures results in cost reductions in fuel usage and handling, flue gas treatment and ash disposal. B&W's supercritical and ultra-supercritical boilers are designed to take full advantage of variable pressure turbine operation.
Specific advantages include:
- For a given output, lower fuel consumption, and thus lower carbon emissions, than other less efficient systems
- The load change rate capability of the system is not restricted by the turbine
- Steam temperature at the inlet and outlet of the reheater is nearly constant over a wide load range
- The boiler feedwater pump power is significantly reduced at lower loads
- Short startup times
- Higher plant efficiency over the entire load range
Rapid Startup Systems
During startup of a once-through boiler, the waterside components must have a minimum water flow maintained to ensure adequate cooling. B&W startup systems are well proven to provide reliable flow to the waterside components to produce short startup times and low thermal stresses.
The main components of B&W’s startup system are the vertical steam separators, water collecting tank and boiler recirculation pump. The steam separator acts like a drum in a natural circulation boiler. The fluid from this separator is recycled to the economizer inlet where it mixes with feedwater to maintain the minimum flow through the boiler furnace. Once minimum load is achieved, the startup system is put in warm standby for quick use when required. The steam from the separator passes through to the superheater and then on to the turbine.
The startup operation parallels that of a drum boiler. This system provides the maximum amount of heat recovery back to the boiler during startup allowing for rapid startups with the least amount of thermal stress on the components.
The Experience of B&W
Having supplied more than 165 supercritical boilers, including the world’s first boiler using supercritical technology in 1957, you can trust B&W to deliver the highest quality steam generation equipment.
Our proven supercritical designs can meet today’s demand for highly efficient, variable pressure steam conditions.
Spiral Wound Universal Pressure Boiler (SWUPTM)
Having supplied more than 165 supercritical boilers, including the world’s first boiler using supercritical technology in 1957, you can trust B&W to deliver the highest quality steam generation equipment.
Our proven supercritical designs can meet today’s demand for highly efficient, variable pressure steam conditions.
- 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
- Supercritical, usually at 3200 psi (22 MPa) throttle pressure with 5% overpressure; higher pressures available
- Superheater steam temperatures
- As required, currently in the 1100F (595C) range
- Fuels
- Pulverized coal
Universal Pressure Boiler (UP®)
- 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 variable superheater pressure load cycling and base load operation.
- Capacity, steam output
- Typically 2,000,000 lb/h (252 kg/s) to more than 10,000,000 lb/h (1260 kg/s)
- Operating pressure
- Supercritical, usually at 3500 psi (24.1 MPa) throttle pressure with 5% overpressure
- Superheater steam temperatures
- As required, currently in the 1100F (595C) range
- Fuels
- Pulverized coal
Vertical Tube Universal Pressure Boiler (VTUP™)
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
- Supercritical, 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
- Fuels
- Pulverized coal
Source: Babcock & Wilcox Enterprises
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