Numerical Simulation Analysis of Biomass Gasification and the Circulating Flow in a Dual Fluidized-Bed Gasifier

• Main Authors: Yu-TeLin, 林祐德
• Other Authors: Tsung Leo Jiang
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/4g234d

碩士 === 國立成功大學 === 航空太空工程學系 === 104 === With the global trend of low carbon emissions, it is inevitable to utilize biomass resources effectively. Since fluidized-bed gasifiers are characterized by the merits of high efficiency, low combustion temperature, low pollutant emissions, and less limitation on fuel selection, an analytical technology for the simulation of a bubbling gasifier with eucalyptus wood chips as the fuel has be developed in the present study by using the commercial CFD software, FLUENT. In addition, the numerical simulation of dual fluidized-bed gasifier is also developed in this study. The dual fluidized-bed gasifier is designed by adopting the concept of FICFB (Fast Internal Circulating Fluidized Bed), including two parts: the gasification zone and the combustion zone. Two zones are linked together as a circulation loop by flowing solid particles through the two zones. As a result, the heat produced in the combustion zone can be transferred to the gasification zone, facilitating the gasification reaction of biomass fuel. With increasing ER values, the content of CO, CH4, and H2 decrease, and that of CO2 increases in the bubbling gasifier. The result is consistent with the experiment. For the dual fluidized-bed gasifier, the solid particles looping through the two zones have been successfully simulated.