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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 plant size where the main reasons for this decision. It was decided to dismantle one of the coal boilers and to substitute it with the new biomass cogeneration system. The investor decided to apply for a grant from the polish Ecofund. The nominal data of the ORC unit are the following: total input power from Thermal oil: 10000 kWth gross electric power: 1750 kWel net electric power: 1670 kWel Thermal power to hot water: 8200 kWth Hot water temperatures: 60/85°C Net electric efficiency: 16,7 % The new cogeneration plant was put into operation in September 2007 and is in successful operation since then. 3 APPLICATION OF ORC UNITS IN THE PELLET PRDUCTION FIELD [5] Different configurations of wood pellet plants based on biomass combustion can be used coupled with ORC units. The biomass fired combustion system of a typical pellet production plant is usually fed with raw material such as bark and low quality wood chips coming from sawmill and wood processing industry close to the pellet plant. Wood pellets are manufactured from untreated wood wastes, mostly sawdust and shavings, without any addition of chemical gluing agent. After a preliminary sorting process, only wood material which respects tight quality standards and with a suitable granulometry flows into the dryer, where evaporation of sawdust water content takes place. From a technical point of view the different drying technologies are usually based on the generation of a hot drying air or gas stream which comes in contact directly with the wet material, drying it up to the optimal moisture content required by the following stages of pellet pressing process. 3.1 CHPplantwithORCunitscoupledtobeltdryers Depending on market boundary conditions, a CHP solution within a pellet manufacturing plant can be profitable. In the following part of this article a CHP solution based on biomass ORC unit and belt dryer is described. A typical pellet production plant based on a biomass combustion system and an ORC unit does not lead to significant changes to conventional heat only plant for pellet production with belt dryer. This means that, in addition to the new installation of CHP biomass pellet plant, retrofitting of already existing pellet plant based on hot water boiler coupled to belt dryer can easily be implemented as well, just replacing hot water boiler with thermal oil boiler feeding ORC unit. Hot water will be actually available downstream the ORC condenser. In Figure 3 a block diagram of the process performed in a CHP biomass plant for pellet production based on belt drying system and ORC unit is shown. 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.PDF Image | ORGANIC RANKINE CYCLE (ORC) IN BIOMASS PLANTS: AN OVERVIEW ON DIFFERENT APPLICATIONS
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