By V Ganapathy
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Extra info for Industrial Boilers and Heat Recovery Steam Generators: Vol. 149 Vol. 149: Design, Applications, and Calculations
Example text
A plant can switch from gas to coal as gas becomes unavailable or very expensive. Most gasifiers can handle different grades of coal. Gas turbine combustors can also handle different fuels with different heating values and gas analysis from low to high Btu. Low SO2, NOx, and CO2 emissions. In an IGCC, 90% of the coal’s sulfur is removed before combustion. NOx is reduced by 90%, as is also the CO2 on lb=kWh basis. The coal gas is purified before combustion, unlike in a conventional coal-fired plant, where the flue gases are cleaned.
41, may be tried to minimize economizer steaming. EFFECT OF STEAM PRESSURE ON HRSG PERFORMANCE Combined cycle plants today operate in sliding pressure mode; if extraction steam is desired at a given pressure for process reasons, then a constant pressure may be required at the steam turbine inlet. Typically the steam pressure is allowed to float by keeping the turbine throttling valves fully open and ensuring full arc admission. The load range over which sliding operation is allowed varies from about 40% or 50% to 100%.
The composition of the fuel gas also allows for better chemistry while cleaning. Low water consumption due to higher efficiency and lower heat losses. Marketable by-products such as sulfur, sulfuric acid, and carbon dioxide. A wide range of technologies such as fixed bed, fluidized bed, and entrained bed gasification. Ability to make use of advances in gas turbine technology. Availability of IGCC plants, which has been in excess of 90% and is improving. Higher gas turbine power output possible due to about 14% larger mass flow of flue gases at the same combustion temperature compared to natural gas.