Power Generation

Designing and operating HRSGs for cycling duty requires close cooperation between the manufacturer and the user. Once HRSGs are in service, a monitoring system should provide a thorough picture of the mechanisms affecting the life and integrity of the boiler.

Today’s heat-recovery steam generators (HRSGs), a vital component in the popular combined-cycle plant, are exposed to more severe duty than merely running at baseload. Deregulation has spurred the development of merchant plants, which are required to start up, load follow, and shut down with minimal notice in response to market conditions. Unless properly designed and operated to withstand this cycling duty, the integrity of the HRSG will be compromised.

Industry professionals need to understand the various damage mechanisms that can result, as well as how to control them. For new projects, damage control begins with the specification of certain design features. Operation and maintenance practices also play an essential role in managing HRSG life, both for new and existing plants. Existing plants also should explore modifications and monitoring programs that can boost the reliability and extend the service life of HRSGs in cycling duty.

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