A semi-empirical approach to the thermodynamic analysis of downdraft gasification
To test the approach we did experiments on charcoal and biomass gasification in a downdraft gasifier. Modeling was done on a non-stoichiometric model maximizing the reaction system entropy.
The semi-empirical approach reveals three limitations of the cold gas efficiency of the experimentally observed process. The first limitation is related to the attainment of a carbon boundary line (which is estimated thermodynamically) by the reaction system. This line corresponds to the maximum cold gas efficiency of the process. The second limitation deals with a shift along the carbon boundary line. The third limitation is a stoichiometric limitation on the formation of combustible gas components.
The process of wood gasification is characterized by a number of phenomena which are untypical of the downdraft process. These phenomena underlie the hypothesis about the wood gasification mechanism. According to this hypothesis the process of gasification runs in the layers of individual particles. At the same time there is either no fuel bed stratification or it does not manifest itself.
Библиографическая ссылка
Svichev D.A., Kozlov A.N., Donskoi I.G., Ryzkov A.F. A semi-empirical approach to the thermodynamic analysis of downdraft gasification // Fuel. Vol.168. No.3. 2016. P.91-106. DOI: 10.1016/j.fuel.2015.11.066Скопировать
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