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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 Figure 4 Schematic diagram of a CHP biomass plant for sawmills with drying chambers and an ORC unit. 5 APPLICATION OF ORC IN THE MDF AND PARTICLEBOARD SECTOR [7] In MDF production plants the heat request of the process is often covered partly or completely by large biomass boilers using waste material from the production process as fuel. The heat is used mainly as thermal oil for the presses and as hot combustion gases for fiber drying. The integration of the ORC in the MDF production process will be analysed in particular considering the possibilities of using the thermal power available downstream the ORC units inside the process, therefore obtaining an operation in CHP mode. 5.1 Cogeneration with ORC units in MDF plants The MDF process also has a high internal consumption of electricity mainly for the chipping and refining of the raw material. This makes the possibility of biomass CHP production particularly attractive not only in countries where subsidies for renewable energy production are available but also in countries where it just helps to reduce the electricity purchase costs for the plant own demand. This possibility has been seldom exploited in MDF plants due to the fact that biomass cogeneration systems based on the traditional steam process require high pressure generators that would lead to a complication of the process. Furthermore the typical size where steam plants are economically competitive (> 5 MWel) leads in most cases to mainly non cogenerative process schemes because the available heat downstream the CHP plant is too high to be used completely inside the process. 5.2 ProcessschemewithORCunit With reference to the following Figure 5 the proposed process scheme is based mainly on the following additional components : An additional thermal oil heater placed in parallel to the main heater and to the flue gas bypass that leads directly to the mixing chamber . A standard ORC unit A hot water/air heat exchanger used to preheat the air supplied to the mixing chamber. Figure 5 illustrates the proposed scheme for a typical system with the same process requirements (20 MWth for drying and 20 MWth for process heat users) assumed for an hypothetical base case without ORC. The operating conditions allow to transfer about 7,7 MWth to the ambient air before the mixing chamber in the case of a hot water temperature of 110°C at ORC outlet and a pinch point of 10°C in 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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