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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 2 FEASIBILITY IN EXISTING DISTRICT HEATING NETWORKS [3] Many large district heating networks are present in Northern Europe. The most common situation is an high temperature network fed by coal or gas, with the possibility of an increase of the efficiency revamping the existing network. In the last few years the most common activities proposed are the optimization of the grid for lower heating temperatures, the substitution of coal with cleaner energy sources (i.e. gas or biomass) and the installation of CHP solutions in grids where heat only solutions exist. The flexibility of the ORC allows to work at partial load, down to 10% of the nominal thermal load, in order to follow the heat requested by the grid. Another operation scheme is to supply the base load that the grid needs during the year with the thermal output of the ORC and to cover the peak loads with other boiler/boilers fed by biomass or others kind of fuels. Starting from these assumptions the feasibility of the investment can be evaluated according to the biomass cost and the remuneration for the electric energy produced. An example of sensitivity of PBT is reported here below, showing the influence of the selling price of the electric energy. Main assumptions for the examples are: Own consumption Thermal efficiency Net Electric efficiency Thermal and electric losses Value of electric energy Biomass humidity Biomass lower heating value Value of thermal energy supplied Biomass price Annual average number of full load operational hours Water outlet temperature from CHP system Boiler ORC 3% 87% 80% - 18% 2% 140 €/MWh 40% 2,9 kWh/kg 30 €/MWh 10 €/MWh lower heating value 5500 h/year 90°C Table 1: Main assumptions for boiler and ORC unit 2.1 Sensitivitytovariationsinelectricityvalue The variations of this very important factor for a cogeneration plant are mainly linked to the Country where the plant is built. This is due to the different incentive schemes for green electricity production implemented in different Countries and, in Countries where no incentive schemes for the production of green electricity are adopted, to the different value of electricity on the national market. Figure 2 shows the discounted payback time depending on the cogeneration plant size and for values of the produced electric energy between 8 and 28 €c/kWh. 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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