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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Thermal oil biomass powered boiler ORC thermal oil 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 electric power ambient air e x ha ust air hot w a te r barking trunks pellets ready to be packaged suitable granulometry; UR around 40 % chipping wood chips UR < 13 % selection/ sorting Belt dryer air cooling/ dedusting pellet making press dedusting/ selection/ refining pellets Figure 3 Schematic diagram of a CHP biomass plant for pellet production based on belt dryer coupled to an ORC unit. 4 APPLICATION OF ORC UNITS IN SAWMILLS [6] A typical application in sawmills with drying chambers based on a biomass combustion system and an ORC unit is reported. This application of ORC units is particularly interesting because additional income can be obtained from electricity generated by the ORC unit without significant changes to the typical sawmill. Part of the electricity generated is used for the own consumption of the plant and the remaining part is sold to the grid, according to the market conditions about electricity value and possible subsidies (Green Certificates or feed-in tariffs) for renewable energy applied in the different countries. For this reason many of the new sawmill plants recently built or under construction are based on CHP solutions with ORC units. 4.1 CHPplantswithORCunitscoupledtodryingchambersinsawmills Depending on market boundary conditions, a biomass CHP solution within a drying chamber plant can be profitable. In the following part of this paper a CHP solution based on biomass ORC units and drying chambers is shown. A typical application in sawmills with drying chambers based on a biomass combustion system and an ORC unit does not lead to significant changes in conventional heat only solutions. This means that retrofitting of already existing drying chambers plant based on a hot water boiler can easily be implemented as well, just replacing the hot water boiler (fed by natural gas or biomass) with a biomass boiler heating thermal oil in order to feed an ORC unit. Hot water will be available downstream the ORC condenser. Figure 4 shows a block diagram of the process that occurs in a CHP biomass plant for sawmills based on drying chambers and an ORC unit. 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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