Effects of Modeling Assumptions on Black Liquor Droplet Combustion

There are many assumptions that have been considered when describing black liquor droplet combustion. These include assuming an isothermal particle, a constant diameter particle, inert inorganic species, and one-film diffusion model. This paper shows the effects of systematically relaxing these factors for a 1-D spherical model for black liquor combustion. The flame is described using boundary layer theory. This model uses the power law scheme for combined advection diffusion, and the fully-implicit scheme for the time step. Model predictions show that swelling is the most important variable. Char reactions with inorganic species significantly enhance char conversion.