Combustion turbine combined cycle plants continue to increase their role in worldwide power generation. Advanced combined cycle plants provide:

• high efficiency, often in excess of 50%

• short project schedules

• reasonable cost with minimum environmental considerations

For reliable operation of these facilities, it is essential the Heat Recovery Steam Generator (HRSG) design adequately address issues to include:

• required load rangeability

• transient operation, particularly start-up and shutdown

• low life cycle costs through high availability

This paper will address the more detailed aspects of the design configuration of large HRSG units.

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