With a better understanding of temperature profiles, plant engineers can increase steam production and minimize losses
When optimizing the efficiency of heat-recovery steam generators
(HRSGs,) fully understanding the temperature profiles of these
units is crucial. Gas turbine HRSGS are unique and pose peculiar
problems as compared to conventional gas/oil-fired boilers when
calculating efficiency or steam output. For conventional
oil/gas-fired steam generators or boilers, one can do heat
balances, efficiency calculations and fuel estimates by assuming an
exit-gas temperature of 300°F to 340°F from the steam generator and
assuming that the feedwater is at 220°F to 250°F irrespective of
steam pressure. However, these assumptions are often not
thermodynamically valid with HRSGs.
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