What reliability, availability, and maintainability (RAM) issues should power producers anticipate when procuring and operating new state-of-the-art heat recovery steam generators (HRSGs)?
Heat recovery steam generators were originally designed to produce steam at one pressure level, without supplementary firing. Over the past decade, HRSG designs have become far more complex. Today once-through or recirculating HRSGs may function at multiple pressures with superheat and reheat. Failures and operating problems have accompanied this increased complexity, in part because the optimal cycle chemistry (see the second question in this category) must be specified for each unique configuration. Statistical RAM data is not available to characterize issues with the latest HRSG designs, but this does not mean that HRSGs do not have RAM issues. Due to the differences in designs and standards for construction, HRSGs should not be considered to be analogous to conventional large gas/oil-fired steam generation boilers. Gas temperature and mass flow maldistributions stemming from the CT exhaust transition ductwork geometry are often problematic, and supplemental firing (duct burning can
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- What reliability, availability, and maintainability (RAM) issues should power producers anticipate when procuring and operating new state-of-the-art heat recovery steam generators (HRSGs)?
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