Effects of Pressure and Heating Rate on Products Release Rates and Yields during Biomass Pyrolysis in Thermally Thick Regime

摘要: Numerical investigation of the synergetic effects reactor pressure and heating rate on biomass pyrolysis in thermally thick regime has been carried out. Wood cylinders  were modeled as two-dimensional porous solids. Transport equations, solid mass conservation intra-particle generation equation energy were coupled simultaneously solved to simulate process accompanying physical phenomena. First order Euler Implicit Method (EIM) was used solve equations. The transport, equations discretized by Finite Volume (FVM). generated set linear Tri-Diagonal Matrix Algorithm (TDMA). Intra-particle fluid flow velocity estimated Darcy’s law. Findings revealed that increase does not significantly affect primary decomposition reactions for all rates considered (10, 20, 30, 40 50 K/s). In vacuum region (0.0001 0.01 atm), had no significant effect release yields product species at rates. pressurized region, (from 10 100 atm) inhibited secondary reactions. Pressure from atmospheric condition caused some changes distribution. degrees conditions much higher than conditions. Primary tar lower while gas more sensitive change Keywords: Biomass, pyrolysis, pressure, rate, reactions,