Development of a Simulation Model for Fluidized Bed Mild Gasifier

• Main Author: Mazumder, AKM Monayem Hossain
• Format: Others
• Published: ScholarWorks@UNO 2010
• Subjects: Clean coal technology; coal gasification; fluidized-bed; mild gasifier; CFD; heterogeneous and homogeneous reaction; finite rate model; multi-phase flow
• Online Access: http://scholarworks.uno.edu/td/101; http://scholarworks.uno.edu/cgi/viewcontent.cgi?article=1100&context=td

A mild gasification method has been developed to provide an innovative clean coal technology. The objective of this study is to developed a numerical model to investigate the thermal-flow and gasification process inside a specially designed fluidized-bed mild gasifier using the commercial CFD solver ANSYS/FLUENT. Eulerain-Eulerian method is employed to calculate both the primary phase (air) and secondary phase (coal particles). The Navier-Stokes equations and seven species transport equations are solved with three heterogeneous (gas-solid), two homogeneous (gas-gas) global gasification reactions. Development of the model starts from simulating single-phase turbulent flow and heat transfer to understand the thermal-flow behavior followed by five global gasification reactions, progressively with adding one equation at a time. Finally, the particles are introduced with heterogeneous reactions. The simulation model has been successfully developed. The results are reasonable but require future experimental data for verification.