PETR 122 |
| Gasification is one of the promising technologies for thermochemical conversion of biomass. Gasification using high-temperature air/steam has been proven to be superior to of the conventional gasification using low temperature gases in many aspects. However, a better understanding on transport phenomena in biomass gasification is needed before its applications in a large scale. This paper will develop a novel modeling tool for studying the multiscale biomass gasification dynamics. The proposed modeling tool consists of two scales models: pore scale and system scale models. The pore scale model will be built based on the SPH meshfree method that can easily identify fluids, gases, and solids and trace material interfaces and moving boundaries. The pore scale code is capable of predicting biomass gasification dynamics in an industrial furnace, porosity distribution, permeability variation, and species concentrations. The system scale (porous medium) model is developed based on the Darcy's law. The proposed model can predict the main chemical and physical processes and is used to study the influence of temperature, oxygen concentration and flow rate of high-temperature gases. A new method is proposed by changing the initial biomass porosity and creating holes in the packed biomass to increase biomass gasification rate. Simulation results are performed for biomass gasification with holes or without holes. The results show that the biomass gasification rate increases with number of holes. The results also reveal that the biomass gasification rate increases as gasification processes. Finally, the biomass packed geometry is optimized using numerical simulations.
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Symposium on Clean Fuels from Biomass
8:30 AM-11:20 AM, Wednesday, 13 September 2006 Palace -- Telegraph Hill, Oral
Division of Petroleum Chemistry |