Aug 26, 2011 · If we generate the same additional 25,000 lb/hr steam in a steam generator, the additional fuel input (Table 1) is about 27.2 million Btu/hr on LHV basis. Another way to look at the efficiency of both boiler types is this: The HRSG generates an additional 75,000 lb/hr of steam with a fuel input of only 75.6 million Btu/hr (subtract the fuel
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However in a gas turbine HRSG, due to thermodynamic reasons, the exit gas temperature is a function of inlet gas temperature, feed-water temperature and steam pressure. The low exhaust gas temperature from gas turbines, typically ranging from 900 to 1050F, generates less steam on unit gas mass basis in the HRSG evaporator compared to a package boiler.
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May 22, 2019 · The reason lies in relatively low steam temperature (6 MPa; 275.6°C). Higher efficiencies can be attained by increasing the temperature of the steam. But this requires an increase in pressures inside boilers or steam generators. However, metallurgical considerations place an …
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Low-capacity, low-pressure boilers (usually fire-tube boilers) rely principally on simple gravity separation of steam and water. At 200 psig and saturation conditions, the density of water is 115 times greater than that of steam. Because the steam is typically used for heating, steam purity requirements are …
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Small cogeneration plants may look at the option of heating thermal fluids such as glycol or therminol in the HRSG or generate low pressure deaeration steam to improve the HRSG efficiency as well as increase the steam turbine power output. Saturated steam from other boilers may …
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