Numerical Investigation of the Effects of Reactor Pressure on Biomass Devolatilization in Thermally Thick Regime

摘要: Effects of reactor pressure on biomass devolatilization in thermally thick regime were numerically investigated this study. Wood pellet  was modeled as a two-dimensional porous solid and pyrolysis was simulated at heating rate 30 K/s final reactor  temperature 973 K for five different pressures [vacuum; 0.0001 0.01 atm, atmospheric;1 atm and  pressurized; 10 100 regions]. Transport equations, kinetic models, intra-particle generation equation energy conservation coupled simultaneously solved to simulate the process. Solid mass equations by first order Euler Implicit Method. Darcy’s law used estimate flow velocity. Finite Volume Method discretize transport, equations. Results showed that even regime, increase does not affect primary tar generation. Findings also revealed rates secondary products atmospheric pressurized regions are significantly different. Further region resulted slight reduction peak rate. further reduced gradient especially region, thereby causing process time elongation. As would be expected, release decreased with while gas increased both regions. Keywords: Biomass, pyrolysis, effects, reactions