Effect of Biomass Size and Aspect Ratio on Intra-Particle Tar Decomposition during Wood Cylinder Pyrolysis

摘要: The effect of biomass size and aspect ratio on intra-particle tar decomposition has been investigated both numerically experimentally to achieve a high rate decomposition. In one experiment, wood cylinders with diameter 8 mm lengths 2, 5, 9 were pyrolyzed in an infrared reactor argon environment. final temperature was 973 K the heating 30 K/s. To make calculation, two-dimensional, unsteady state, single particle model used, same convective radiative heat fluxes given top side surface all cylinders. Both calculation experiment showed that yield when length increased kept constant. that, first, formed cylinder, then it moved outwards during find effective cylinder for further decomposition, calculations also performed which (D/L) varied from 0.4 6.9 volume fixed. As result, low suited because difference thermal conductivity along grain radial directions, although there is optimum change residence time. It well known unpyrolyzed direction much lower than grain. By decreasing ratio, area total increases. This means more entered surface, caused gradient cylinder. When large, primary tar, relatively temperature, passed through layer at temperatures, enough advance before released. resulted enhancement