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STUDIO DI SISTEMI ENERGETICI AVANZATI ALIMENTATI CON COMBUSTIBILI DA FONTO FOSSILI E RINNOVABILI PER LA PICCOLA E MICRO-COGENERAZIONE DISTRIBUITA

Cadorin, Margherita (2010) STUDIO DI SISTEMI ENERGETICI AVANZATI ALIMENTATI CON COMBUSTIBILI DA FONTO FOSSILI E RINNOVABILI PER LA PICCOLA E MICRO-COGENERAZIONE DISTRIBUITA. Tesi di Dottorato , Università degli Studi di Ferrara.

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    Abstract

    In the present work the energetic and economical performance of different energy systems for smart and micro-cogeneration has been analyzed. The analysis has been carried out in order to compare the performance of energy systems under different operating conditions and fuel feeding. In particular, traditional energy systems (such as micro gas turbines and internal combustion engines) and innovative energy systems (such as thermophotovoltaic technology) have been analyzed. In last years, the use of the traditional energy systems in residential smart and micro- CHP has grown up and therefore they could be considered as a well-established technology. For this reason, an analysis focused on the influence of the use of different fuels (traditional fuels and fuels obtained from biomass) has been considered an interesting issue. The analysis has been carried out following two different approaches: the development of a zero-dimensional model implemented in MatLab environment and of a three-dimensional model using the commercial code ANSYS CFX for thermofluiddynamic analyses. The zero-dimensional model has been realized in order to investigate the performance of an integrated system, which includes production, gathering, carriage and transformation of biomass into renewable fuels and then into energy (both electrical and thermal) from an energetic and economic point of view. The model allows the analysis of the main features of the whole process in terms of efficiency of the transformation process and of efficiency of different kinds of energy systems. The model has been applied to identify the system configuration which maximizes economic profitability, with respect to the current scenario which implies the fulfillment of environmental issues, of economic constraints, of reduced impact on population and of high system efficiency. Moreover, the model is characterized by a modular structure in order to simulate different plant layouts (different type of biomasses, transformation processes and energy systems). The three-dimensional model is focused on the CFD analysis of combustion in micro gas turbines combustors. In particular, the behavior of combustors of two different 100 kWel micro gas turbines has been taken into consideration. The analyses have been carried out in order to evaluate the combustor performances under different operating conditions in terms of: thermal power, velocity and temperature profiles, concentration of chemical species and formation of pollutant emissions such as CO and NOx. The analyses involve the use of traditional fossil fuels, such as natural gas, and of fuels obtained from biomass transformation processes, such as syngas from thermochemical gasification. The innovative energy system analyzed in the present work is a thermophotovoltaic system (TPV) applied to a condensing boiler for domestic application characterized by a maximum nominal thermal power equal to 30 kWth. At first, the analysis has been performed through the definition of different scenarios in order to investigate the energetic and economic performance of TPV technology related to the actual values of system efficiency and purchase costs and referred to a consolidated technology. Moreover, a CFD analysis of the boiler has been carried out using the commercial code ANSYS CFX. Numerical three-dimensional models have been developed to analyze the boiler behavior both in the combustion chamber and in the water-gas heat exchanger. The models allow the analysis of the whole boiler performance in terms of fluid dyynamic behavior and heat transfer phenomena. At last, the models allow to estimate the deliverable electric energy if TPV cells would be applied on boiler combustion chamber lateral walls.

    Tipologia del documento:Tesi di Dottorato (Tesi di Dottorato)
    Data:18 Marzo 2010
    Relatore:Pinelli, Michele
    Coordinatore ciclo:Trillo, Stefano
    Istituzione:Università degli Studi di Ferrara
    Dottorato:XXII Anno 2007 > SCIENZE DELL'INGEGNERIA
    Struttura:Dipartimento > Ingegneria
    Soggetti:Area 09 - Ingegneria industriale e dell'informazione > ING-IND/09 Sistemi per l'energia e l'ambiente
    Parole chiave:sistemi energetici, combustione, sisetmi termovoltaici, MTG, energy systems, combustion, CFD, MGT, thermophotovoltaics
    Depositato il:19 Lug 2010 13:59

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