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Biomass Based Small Scale Combined Heat and Power Tech

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Biomass Based Small Scale Combined Heat and Power Tech ( biomass-based-small-scale-combined-heat-and-power-tech )

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Spilling Steam Engine Spilling Energie Systeme GmbH a German steam engine manufacture which delivers biomass based CHP plants up to 1500 kWel. There are at least 18 CHP plants based on the Spilling engine in Germany, [7]. Technology The Spilling system uses a setup illustrated in Figure 2.8. The boiler generates superheated steam with the combustion of biomass. The steam is then used in the steam engine, which produced electric power. The expanded steam is later condensate in the district heat network or the air cooled surplus steam condenser. After condensation the saturated water is returned to the boiler. Figure 2.8 Spilling steam engine cycle, [25] System performance Hansen, [26] presented performance data for a steam engine plant delivered by Spilling. The plant has an electricity power of 110 kWel , heat output of 1050 kWth and fuel power input of 1620 kWth. This results in an electric efficiency of 7% and a total efficiency of 72%. No real performence data could be identified. Economic evaluation According to the same presentation by Hansen [26] the specific investment of the 110 kWel plant amounts to 3500 €/kWel. If this value is used with the assumptions in Table 2.8 and evaluated with the method presented in Chapter 1.3, the COE amounts to 133 €/MWhel, calculations is found in Appendix F. 23

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