Cogeneration systems fired with coal or other solid fuels and containing conventional extracting-condensing or back pressure steam turbines can be found throughout the world. A potentially more economical plant of higher output per unit thermal energy is presented that employs a pressurized fluidized bed (PFB) and coal carbonizer. The carbonizer produces a char that is fed to the PFB and a low heating value fuel gas that is utilized in a topping combustion system. The topping combustor provides the means for achieving state-of-the-art turbine inlet temperatures and is the main contributor to enhancing the plant performance. An alternative to this fully coal-fired system is the partially coal, partially natural gas-fired air heater topping combustion cycle. In this cycle compressed air is preheated in an atmospheric pressure coal-fired boiler and its temperature raised further by burning natural gas in a topping gas turbine combustor. The coal fired boiler also generates steam for use in a cogeneration combined cycle. The conceptual design of the combustion turbine is presented with special emphasis on the low-emissions multiannular swirl burner topping combustion system and its special requirements and features.

Issue Section:
Gas Turbines: Combustion and Fuels
Topics:
Coal, Combined heat and power, Combustion, Turbines, Boilers, Combustion chambers, Combustion systems, Cycles, Temperature, Atmospheric pressure, Cogeneration systems, Combined cycles, Compressed air, Conceptual design, Emissions, Fluidized beds, Fuels, Gas turbines, Gaseous fuels, Heating, Natural gas, Pressure, Steam, Steam turbines, Thermal energy
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