In this paper, the effect of fuel composition on gasification exergetic efficiency is investigated with the aid of equilibrium and non-equilibrium models. The work aims at comparing, for different fuels, the second principle theoretical efficiencies of air gasification and oxygen-steam gasification. The study considered several fuels, ranging from coals to biomasses; numerical tests were carried out by an equilibrium model in three gasification conditions: Carbon Deposition Boundary (complete fuel gasification, no solid matter in the products), 1200 K and 1500 K reaction temperature. According to the results obtained, air gasification operated on biomass fuels shows higher exergetic efficiency values compared to oxygen gasification for the Carbon Deposition Boundary and 1200 K conditions tested; this demonstrates the suitability of using air as oxidizer. To provide a complete discussion, a modified equilibrium model able to account for the main non-equilibrium effects was applied to evaluate the exergetic efficiency of biomass fuels under real gasification conditions.
Numerical Exergetic Analysis of Different Biomass and Fossil Fuels Gasification
DAMIANI, LORENZO;REVETRIA, ROBERTO
2014-01-01
Abstract
In this paper, the effect of fuel composition on gasification exergetic efficiency is investigated with the aid of equilibrium and non-equilibrium models. The work aims at comparing, for different fuels, the second principle theoretical efficiencies of air gasification and oxygen-steam gasification. The study considered several fuels, ranging from coals to biomasses; numerical tests were carried out by an equilibrium model in three gasification conditions: Carbon Deposition Boundary (complete fuel gasification, no solid matter in the products), 1200 K and 1500 K reaction temperature. According to the results obtained, air gasification operated on biomass fuels shows higher exergetic efficiency values compared to oxygen gasification for the Carbon Deposition Boundary and 1200 K conditions tested; this demonstrates the suitability of using air as oxidizer. To provide a complete discussion, a modified equilibrium model able to account for the main non-equilibrium effects was applied to evaluate the exergetic efficiency of biomass fuels under real gasification conditions.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.