Vertical, natural circulation boiler for Tapada do Outeiro
Journal Article
·
· Turbomachinery International
OSTI ID:420890
With the new generation of high power, high temperature gas turbines, has come the demand for a tri-pressure reheat steam cycle to increase output and efficiency. As a result, designers are looking again at natural circulation heat recovery boilers, but with a vertical gas path. Tapada do Outeiro is probably the first project which has been specified with a vertical natural circulation configuration. Other boiler companies are experimenting with bypasses on the circulation pumps of tri-pressure boilers, so that natural circulation can be studied in a fully commercial environment. Effectively, the pumps are used at start-up, and then shut off so that the boiler effectively runs in natural circulation when stable conditions have been established. Although the plant is intended to run mainly for base load, it may also be used for load following with daily or weekly start. Aids to quick starting include provisions of weather damper to retain heat in the boiler overnight. There are no bypass stacks, but steam dumps to the condenser. The gas turbine exhausts straight into the cold boiler.
- OSTI ID:
- 420890
- Journal Information:
- Turbomachinery International, Journal Name: Turbomachinery International Journal Issue: 4 Vol. 37; ISSN 0149-4147; ISSN TUINDP
- Country of Publication:
- United States
- Language:
- English
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