Abstract
Experimental research on the pyrolysis and gasification of randomly packed straw pellets was conducted with an emphasis on the reactive properties of the shrinking porous structure of the pellets. The apparent kinetics of such pyrolysis was approximated by the random pore, grain, and volumetric models. The best approximation results were obtained with the grain and random pore models. The self-organized oscillations of the pellet conversion rate during pyrolysis were observed. Two complementary explanations of the phenomenon are proposed.
Highlights
Old and modern gasification reactors are fed by various types of fuel, including raw biomass and biomass in pelletized form
The apparent kinetics of such pyrolysis was approximated by the random pore, grain, and volumetric models
By considering the joint transport of mass and heat by steam or argon moving through the structure of randomly packed pellets to be analogous to the diffusion of a gasification agent into the microporous structure of the char, we may consider both the random pore and grain models to be applicable to the simulation of the process, which dynamically changes the para-meters of the random pellet packing
Summary
Old and modern gasification reactors are fed by various types of fuel, including raw biomass and biomass in pelletized form. By considering the joint transport of mass and heat by steam or argon moving through the structure of randomly packed pellets to be analogous to the diffusion of a gasification agent into the microporous structure of the char, we may consider both the random pore and grain models to be applicable to the simulation of the process, which dynamically changes the para-meters of the random pellet packing. This consideration assumes the application of the so-called scaling approach. Analytical moisture (dry air) Total moisture Ash Combustible matter Volatiles HHV (higher heating value) HHV LHV (lower heating value) LHV Ultimate analysis Carbon Hydrogen Oxygen Nitrogen Sulfur Chlorine Fluor
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