Modeling and simulation of reduction zone of downdraft biomass gasifier: Effect of char reactivity factor

Modelling of a downdraft biomass gasifier with finite rate kinetics in the reduction zone

“…The model predictions have been validated against the results of Jayah et al [27]. Though the equilibrium models of the downdraft gasifier, available in the literature [16][17][18][19][20][21], widely studied the effects of variations of different operating parameters (like equivalence ratio, moisture content in the fuel, heat loss from the gasifier, temperature in the gasification zone, pressure) on the gasification process, such studies have not been reported yet with the kinetic models [23][24][25]. The present model is therefore used to predict the effect of equivalence ratio and fuel moisture content on the performance of the downdraft gasifier to optimize the operating condition.…”

“…Babu and Sheth [24] modified the model of Giltrap et al [23] with a variable char reactivity factor along the length of the downdraft gasifier reduction zone. The authors interpreted that an exponential variation of the char reactivity factor worked better for the model.…”

“…However, thermodynamic equilibrium never occurs in reality in the gasification process [22] and can only be approximated in the high temperature zone of the downdraft gasifier. To overcome the limitations of the equilibrium model, recent works have considered finite rate kinetics for the chemical equations, particularly in the reduction zone of the downdraft gasifier [23][24][25]. The kinetic models are based on the chemical reaction path prescribed by Wang and Kinoshita [26] for the reduction of biomass char in the char reduction zone of the gasifier.…”

Producción y uso de pellets de biomasa para la generación de energía térmica: una revisión a los modelos del proceso de gasificación

“…Para Otro enfoque es desarrollado por Babu [52] en el cual se definen no sólo las reacciones en la etapa de reducción como una serie de reacciones en equilibrio sino que adicionalmente son evaluadas las cinéticas en términos de la energía de activación y el factor de frecuencia.…”

Pyrolysis of cherry laurel (Prunus Laurocerasus L.) seed in the presence of sodium carbonate

“…The methods available for energy production from biomass can be classified into two principal categories: (a) thermochemical conversion and (b) biological conversion processes. There are three main types of thermochemical conversion processes to producing biofuels and chemicals from biomass materials: pyrolysis, gasification, and combustion (Babu and Sheth, 2007;Kumar et al, 2009).…”