Direct-Fired Combustion

Direct-fired combustion is the most common technology currently used to generate elec­tricity. Direct combustion typically burns biomass in a boiler to produce steam that is

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then used to power turbines to produce electricity (Figure 3.2). Direct-flred systems are typically smaller in size, 10-50 MW, due to the feedstock requirements and draw radius limitations [11]. In some cases, steam is released from the turbine at medium pressures and temperatures and is used for process heating and cooling to help improve the economics.