Effect of reactions in small eddies on biomass gasification with eddy dissipation concept - Sub-grid scale reaction model

The figure shows the comparison of outlet gas composition molar fractions with experimental data. The maximum, minimum and averaged values of experimental data summarized from 18 kinds of wood are given. It can be seen that the simulation results are within an acceptable range of experimental results. The simulation results without EDC-SGS reaction model are also given in the figure. The CO and H2 molar fractions with EDC-SGS reaction model are lower than that without EDC-SGS reaction model. Because the EDC-SGS reaction model considers the effect of sub-grid scale eddy on CO and H2 oxidation process, the total reaction rate is increased. Accordingly, the CO2 molar fraction with the EDC-SGS reaction model is higher than that without the EDC-SGS reaction model. The N2 molar fraction with the EDC-SGS reaction model is higher than that without the EDC-SGS reaction model. The total reactions rates of gas oxidation are increased, which makes the gas volume in the furnace decreased. Owing to an invariant N2 amount, the molar fraction of N2 is relatively increased.85