This paper presents a non-stoichiometric equilibrium model for the simulation of biomass downdraft gasifiers. The chemical equilibrium is determined by minimizing the Gibbs free energy. Five elements characterize the biomass and 15 chemical species are considered in the syngas. The model calculates the lower heating value of the syngas and the relative abundances of gasification products. An advantage of this model is that it can easily calculate not only the concentrations of the main gasification products, but also the concentrations of minor product, especially the pollutant chemical species containing Nitrogen and Sulfur. To analyse the model behaviour, a sensitivity analysis on process parameters is presented. The model is validated by comparing its results with the results of simulation carried out with a stoichiometric model and with experimental data found in literature. Finally, the model is applied to the study of the gasification of forest waste.

A Model for the Prediction of Pollutant Species Production in the Biomass Gasification Process / Gambarotta, Agostino; Morini, Mirko; Zubani, Andrea. - In: ENERGY PROCEDIA. - ISSN 1876-6102. - 105:(2017), pp. 700-705. ((Intervento presentato al convegno 8th International Conference on Applied Energy, ICAE 2016 tenutosi a chn nel 2016 [10.1016/j.egypro.2017.03.378].

A Model for the Prediction of Pollutant Species Production in the Biomass Gasification Process

GAMBAROTTA, Agostino;MORINI, Mirko;ZUBANI, ANDREA
2017

Abstract

This paper presents a non-stoichiometric equilibrium model for the simulation of biomass downdraft gasifiers. The chemical equilibrium is determined by minimizing the Gibbs free energy. Five elements characterize the biomass and 15 chemical species are considered in the syngas. The model calculates the lower heating value of the syngas and the relative abundances of gasification products. An advantage of this model is that it can easily calculate not only the concentrations of the main gasification products, but also the concentrations of minor product, especially the pollutant chemical species containing Nitrogen and Sulfur. To analyse the model behaviour, a sensitivity analysis on process parameters is presented. The model is validated by comparing its results with the results of simulation carried out with a stoichiometric model and with experimental data found in literature. Finally, the model is applied to the study of the gasification of forest waste.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11381/2832917
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