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Descripción
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| Air pollution has become a global concern and organizations such as the International Maritime Organization have set limits to these emissions in the shipping sector. Fuel cells are very low-pollutant electrochemical devices that have been identified as good power generation candidates for the maritime. Despite their low emissions, fuel cell power systems are, in general, not powerful enough to cover current demands in the maritime transport. To fulfil this limitation a hybrid power system running on natural gas is proposed and analysed. Such hybrid system, SOFC-RK, consists of a high-temperature fuel cell, Solid Oxide Fuel Cell (SOFC), and a steam power cycle, Rankine (RK), which in addition leads to lower pollutant emissions than conventional power generation systems based typically on diesel generation sets. To obtain the output power and total emissions of the hybrid SOFC-RK system, mathematical models for each component have been selected, assessed and implemented in MATLAB/Simulink. The SOFC is fed with natural gas instead of hydrogen. This implies a reforming process to produce hydrogen, which goes inside the SOFC in the presence of steam. This takes advantage of the high operating temperature of the fuel cell [1]. Natural gas and steam enter together in the anode of the SOFC whereas air goes in the cathode to provide the oxygen needed for the electrochemical reaction, producing electrical energy and heat. The Rankine cycle coupled to the SOFC needs a heat source, supplied by the high-temperature exhaust gas stream of the SOFC. Such stream contains hydrogen not reacted in the fuel cell [2]. This hydrogen combusts in an external boiler heating a compressed water stream of the cycle and producing superheated vapour. This vapour expands in a turbine that generates electric energy when coupled to a generator. The nominal electrical power output of the SOFC under study is 2 MW. The electrical power output of the Rankine cycle is 500 kW. This hybrid SOFC-RK system configuration yields higher efficiency than the equivalent Rankine cycle [3], leading to a reduction of pollutant gases, such as NOx, and Green House Gases, as CO2. Besides, the use of natural gas, a fuel without sulphur content, avoids emissions of SOx. This hybrid system allows reducing also the fuel consumption. | |
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Internacional
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Si |
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Nombre congreso
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XI Congreso Nacional y II Internacional De Ingeniería Termodinámica |
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Tipo de participación
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960 |
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Lugar del congreso
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Albacete (España) |
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Revisores
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Si |
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ISBN o ISSN
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978-84-09-11635-5 |
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DOI
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Fecha inicio congreso
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12/06/2019 |
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Fecha fin congreso
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14/06/2019 |
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Desde la página
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1253 |
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Hasta la página
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1264 |
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Título de las actas
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11CNIT-Proceedings Book XI Congreso Nacional y II Internacional De Ingeniería Termodinámica |