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SRI/USEPA-GHG-VR-27 September 2003 process flow diagram of the microturbine CHP system at this site and a discussion of each component is provided below. C 0U Ca M Mi a p i c p s cr st r to o o t o n t u ne u e 6 r r b b i 60 Un i n n e e E Figure 1-1. The Waldbaum’s Capstone 60 Microturbine System Electric power is generated from a high-speed, single-shaft, recuperated, air-cooled turbine generator with a nominal power output of 60 kW net (59 oF, sea level). Table 1-1 provides Capstone 60 microturbine specifications. Table 1-2 summarizes the physical and electrical specifications for the Capstone 60, which is designed to operate on natural gas and consists of an air compressor, recuperator, combustor, turbine, and a permanent magnet generator. The recuperator is a heat exchanger that recovers some of the heat from the exhaust stream and transfers it to the incoming compressed air stream. The preheated air is then mixed with the fuel and this compressed fuel/air mixture is burned in the combustor under constant pressure conditions. The resulting hot gas is allowed to expand through the turbine section to perform work, rotating the turbine blades to turn a generator, which produces electricity. The need for a gearbox and associated moving parts is eliminated because of the inverter-based electronics that enable the generator to operate at high speeds and frequencies. The rotating components are mounted on a single shaft – supported by patented air bearings – that rotates at over 96,000 revolutions per minute (rpm) at full load. The exhaust gas exits the turbine and enters the recuperator which pre-heats the air entering the combustor to improve the efficiency of the system. The exhaust gas then exits the recuperator into a Unifin heat-recovery unit. 1-3 Ex ni x c i c h f fi h a in nH an n g He ge e a er a t r tPDF Image | Environmental Technology Verification Report
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