A comprehensive dynamic model for downdraft gasifier using heat and mass transport coupled with reaction kinetics

作者：Patra Tapas Kumar; Nimisha K R; Sheth Pratik N^*

来源：Energy, 2016, 116: 1230-1242.

DOI：10.1016/j.energy.2016.10.036

• Biomass
• Gasification
• Downdraft gasifier
• Transport and kinetic model
• Modeling and simulation

A dynamic multiphase model combining mass and energy transport with kinetics for the gasification of wood in a downdraft gasifier is developed. The developed model takes into account the mass and energy balance of both solid and gas species. It also includes the reaction kinetics of various phenomena i.e. drying, pyrolysis, combustion and reduction occurring inside the gasifier. The global kinetics of pyrolysis, combustion kinetics of gaseous and solid species, homogenous and heterogeneous reduction kinetics and diffusion controlled moisture evaporation are incorporated in the model. The developed model is simulated to predict various variables such as biomass consumption rate, producer flow rate and its composition throughout the gasifier at various locations at different time. The model is validated with the experimental data reported in our earlier study. The simulation results are found to be well in agreement with the experimental data. The dynamic behavior of downdraft gasifier is studied by analyzing the axial profiles of temperature, concentration and density at different time.

• 出版日期2016-12-1