1,721,022 research outputs found
La produzione d’idrogeno da risorse rinnovabili: stato dell’arte e prospettive
No full textAtti del Convegn
Biomass to hydrogen: resource potential and possible technology
No full textAtti del convegno dell'European Science Foundatio
Biomass to Hydrogen for the realization of closed cycles of energy resource
No full textThe crucial mission of energy research is the promotion and implementation of methods, technologies and processes for a sustainable economic and social development. Within this framework the key progress energy systems is the realization of Closed Cycles of Energy Resources—CCER, whose goal is to achieve zero consumption in terms of non-renewable resources and no impact on the environment. A CCER can be realised with biomass, a renewable energy resource, and hydrogen, the “cleanest” fuel. This solution can supply secure and environmental friendly energy for medium electric and heating power demand. This context meets the actual trend towards cleaner, greener, smaller and more decentralized energy production facilities. The paper, after a brief description of closed hydrogen cycle and biomass resources, presents a comprehensive overview of the topic. The review of sustainability of biomass hydrogen systems shows how these systems, even if they require further research and demonstration activity, can obtain a remarkable electricity and heat production with near “zero” pollution. Furthermore, using refusals or “trash” materials and “standard” technologies, the biomass to hydrogen systems can provide in many case economic and social advantages
Sistemi a biomasse: progettazione e valutazione economica. Impianti di generazione di calore e di elettricità.
No full textThe feasibility of an indirectly heated biomass gasifier combined with hot gas conditioning and cleaning, MCFC, gas turbine and hydrogen production
No full text
MCFC and microturbine power plant simulation
No full textThe consistent problem of the CO2 emissions and the necessity to find new energy sources, are motivating the scientific research to use high efficiency electric energy production's technologies that could exploit renewable energy sources too. The molten carbonate fuel cell (MCFC) due to its high efficiencies and low emissions seems a valid alternative to the traditional plant. Moreover, the high operating temperature and pressure give the possibility to use a turbine at the bottom of the cells to produce further energy, increasing therefore the plant's efficiencies. The basic idea using this two kind of technologies (MCFC and microturbine), is to recover, via the microturbine, the necessary power for the compressor, that otherwise would remove a consistent part of the MCFC power generated. The purpose of this work is to develop the necessary models to analyze different plant configurations. In particular, it was studied a plant composed of a MCFC 500kW Ansaldo at the top of a microturbine 100kW Turbec. To study this plant it was necessary to develop: (i) MCFC mathematical model, that starting from the geometrical and thermofluidodynamic parameter of the cell, analyze the electrochemical reaction and shift reaction that take part in it; (ii) plate reformer model, a particular compact reformer that exploit the heat obtained by a catalytic combustion of the anode and part of cathode exhausts to reform methane and steam; and (iii) microturbine-compressor model that describe the efficiency and pressure ratio of the two machines as a function of the mass flow and rotational regime. The models developed was developed in Fortran language and interfaced in Chemcad((c)) to analyze the power plant thermodynamic behavior. The results show a possible plant configuration with high electrical and global efficiency (over 50 and 74%). (c) 2006 Elsevier B.V. All rights reserved
Process simulation of a neutral emission plant using chestnut’s coppice gasification and Molten Carbonated Fuel Cell
No full textThe problem of CO2 emissions and the need to find new energy sources are pushing scientific research toward the use of high efficiency technologies for electric power generation that can exploit renewable energy sources—potentially neutral for the environment in terms of greenhouse gas emissions. Process simulations of advanced plants fed by biomass are a key step to develop renewable resources based high temperature fuel cell applications. The aim of this work is to predict the component behavior of a specific power plant mainly composed of a gasifier, a molten carbonate fuel cell (MCFC), and a micro-gas-turbine (mGT) and fed by chestnut coppice, waste available in great quantity in Central Italy, as well as in several other European regions. The gasifier produces a gas with a high content of hydrogen and low content of char and tar. This syngas is exploited by the MCFC-mGT plant. The mGT, using the MCFC cathode outlet gases, shows through simulation to be able to operate the air compressor and produce further electrical power. Particular models for the MCFC and gasifier have been developed in FORTRAN by the authors and then interfaced to commercial software (CHEMCAD©) to simulate the plant's thermodynamic behavior. The results show the possibility of an extremely interesting “carbon neutral” plant configuration with high electrical and global efficiency (respectively, 41% and 86%), exclusively based on the use of renewable resources (biomass)
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