Comprehensive thermodynamic equilibrium model with modified equilibrium constants for biomass downdraft gasifiers

This paper proposes a novel, comprehensive stoichiometric thermodynamic equilibrium model to forecast the chemical compositions of syngas from a downdraft gasifier for various biomass fuels. The principal objective of this model is to predict the chemical compositions of syngas while reducing the individual percentage error in the estimation of moles of different species, hence attaining a minimal Root Mean Square Error (RMSE). Model is prepared as available in literature and then modified for the different kind of fuels and biomasses to minimize error in prediction. The model is developed to find out two modified equilibrium constants, 1.01 and 0.65 for water-gas-shift reaction and methane reaction respectively in thermodynamic equilibrium model (TEM) which can be applicable to all types of fuels. This will make this comprehensive stoichiometric thermodynamic equilibrium model a generalized for all kind of fuels. Many researchers have modified the thermodynamic equilibrium models for different kind of fuels, which makes their model fuel specific. Here the model prepared is generalized for all kind of fuels.