ORGANIC RANKINE CYCLE (ORC) IN BIOMASS PLANTS: AN OVERVIEW ON DIFFERENT APPLICATIONS

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ORGANIC RANKINE CYCLE (ORC) IN BIOMASS PLANTS: AN OVERVIEW ON DIFFERENT APPLICATIONS ( organic-rankine-cycle-orc-in-biomass-plants-an-overview-on-d )

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Turboden s.r.l. via Cernaia,10 25124 Brescia Italy t. +390303552001 f. +390303552011 info@turboden.it www.turboden.it C.F./P.I. 02582620981 capitale sociale Euro 1.800.000,00 i.v. registro delle imprese C.C.I.A.A. di Brescia REA 461817 the hot water air heat exchanger. Assuming thermal oil temperatures of 300/250 °C at ORC inlet/outlet a net electric power of 1,45 MWel can be produced by the ORC unit in completely heat driven operation (CHP mode). Figure 5: Proposed scheme for energy plant with ORC cogeneration unit in Metso Panelboard factory [10] 6 CONCLUSIONS This paper shows that biomass cogeneration systems based on ORC units can have a good feasibility with frame conditions typical for the whole European area. The electricity value required in order to reach feasibility compatible with bank financing of these projects is around 10 €c/kWh for plants with installed power above 1,5 MWel. Therefore projects in this scale can be feasible under normal frame conditions in most European countries. Plants in the range around 1 MWel are also feasible with the electricity values around 14 €c/kWh, that can be achieved with support schemes for renewable electricity generation implemented in different European countries. In general it can be observed that the required electricity value increases steeply with lower size plants therefore higher guaranteed electricity values are required in order to exploit also more distributed renewable cogeneration. The flexibility of ORC also permits a large kind of CHP applications, as shown in this paper, mainly in district heating and in the wood industry. This mean that wood industries can use waste wood, coming from internal process, to feed biomass boiler increasing the global efficiency of the factory using the hot water coming from the ORC for the production processes instead of using fossil fuels; in the same way biomass boiler coupled with an ORC can replace fossil fuel systems in already district heating grids with big benefits for the environment. For the actual average European specific emissions of CO2 for electricity generation, biomass cogeneration is the heat supplier that promises the highest emissions reduction. The advantage of biomass cogeneration towards other heat supply solutions will increase in the future when specific emissions of CO2 for electricity generation will decrease. The real cases described in this paper shows that ORC is a mature and reliable technology with an high level of flexibility due to the possibility to being integrated in already existing grid or industrial processes. References This document contains proprietary information of turboden srl. Duplication or disclosure to a third party of the information contained herein is expressly forbidden without the written consent of Turboden srl - Questo documento non deve essere riprodotto ne` divulgato senza autorizzazione scritta di Turboden srl.

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