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11:30
20 mins
Dynamic analysis of off-grid ORC plants with various solution for the thermal storage
Paolo - Iora, Gioele Di Marcoberardino, Costante M. Invernizzi, Giampaolo Manzolini, Paolo Belotti, Roberto Bini
Session: Session 1B: Dynamic Simulation
Session starts: Wednesday 13 September, 10:30
Presentation starts: 11:30
Room: Building 27 - Lecture room 02


Paolo - Iora (University of Brescia)
Gioele Di Marcoberardino (Politecnico di Milano)
Costante M. Invernizzi (University of Brescia)
Giampaolo Manzolini (Politecnico di Milano)
Paolo Belotti (Turboden srl)
Roberto Bini (Turboden srl)


Abstract:
Real time matching of electric power generation is a crucial aspect in off-grid systems as well as in case of use of renewable intermittent sources. In this paper, with reference to 1 MWel Turboden biomass ORC plants operating in off-grid systems, we study the possibility to store thermal energy in the form of sensible heat within a storage composed by a bunch of steel or cast iron pipes with variable thickness and different coating materials. Thermal power is taken in and out of the storage by a flow of thermal oil, heated by a biomass furnace, and eventually supplied and converted into electricity by the ORC plant running in an off-grid area. Starting from steady state conditions at 30% of the nominal power of the furnace, we assume an instantaneous increase to 100% of the electric power demand and we study the transient of the system in correspondence of the furnace power ramp. To this purpose, we developed a dynamic finite difference model , for the system composed by the furnace, the ORC plant, the furnace inlet and outlet piping and the thermal storage. It comes out that with a storage system properly designed as function of the furnace power ramp, it is possible to run the ORC at 100% during the analyzed transient, thus allowing a real time matching of the power demand.