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Turboden s.r.l. – Via Cernaia, 10 25124 Brescia Italy – C. FISC. / P.IVA. IT02582620981 tel +39 030 3552001 – fax +39 030 3552011 – email info@turboden.it – web www.turboden.it 1. A SHORT DESCRIPTION OF THE DRYING PROCESS IN SAWMILL PLANT The drying of timber in a conventional sawmill is executed as a batch process in suitable drying chambers. The wood is dried in closed chambers where air is heated up in a controlled way usually by an external heat source (hot water, low pressure steam, gas boiler etc,). In most cases in order to avoid the strains of the wood, and maintain a high wood quality a relatively low air temperature is used inside the chamber. Usually the required air temperature is suitable for the use of hot water with 90-95 °C feeding temperature (75 – 80°C return) as heat source. Often the heat is produced by biomass boilers burning biomass residues available in the sawmill. 2. CHP PLANTS WITH ORC UNITS COUPLED TO DRYING CHAMBERS IN SAWMILLS Depending on market boundary conditions, a biomass CHP solution within a drying chamber plant can be profitable. In the following part of this study 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 1 shows a block diagram of the process that occurs in a CHP biomass plant for sawmills based on drying chambers and an ORC unit. Turboden has 22 references of CHP applications in sawmill plants and 17 references in pellet production. ORC application in Sawmills thermal oil electric power ORC trunks hot water product Biomass powered boiler selecting barking processing packaging ddryryiningg Figure 1 Schematic diagram of a CHP biomass plant for sawmills with 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 EXPRESSELY FORBIDDEN WITHOUT THE WRITTEN CONSENT OF TURBODEN SRL. - QUESTO DOCUMENTO NON DEVE ESSERE RIPRODOTTO NE` DIVULGATO SENZA AUTORIZZAZIONE SCRITTA DI TURBODEN SRL.PDF Image | APPLICATION OF ORC UNITS IN SAWMILLS. TECHNICAL-ECONOMIC CONSIDERATIONS
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