GroupUltra Super Critical Boilers
Clean coal technology
A substantial part of the world’s growth in power generation will be based on coal for at least the next 20-30 years. At the same time there is a requirement for reduction of harmful emission from coal fired units and also an increasing demand for limiting greenhouse gas (CO2) emission.
The current approach for facing these requirements is called “Clean Coal Technology”. One of the most favoured solutions is the Ultra Super Critical (USC) power cycle, which has demonstrated in several plants that it is a fully commercially developed process with excellent performance and availability records.
During the 1980’s and 90’s the technology has been developed from the subcritical through the supercritical to the ultra supercritical design with the first two units designed by BWE in commercial operation in 1997 and 1998 and the third unit in 2001. The characteristic of the USC cycle is the steam properties of 600°C temperature and 305 bar pressure. Double reheating has been introduced in order to increase the efficiency and in order to reduce the wetness of the exhaust steam from the LP turbine.
Apart from the improvements in the steam cycle and the related development of new materials, there have also been major improvements in the conceptual design of the boiler.
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