Approximating a Three-Dimensional Fluidized Bed With Two-Dimensional SimulationsMechanical Engineering Conference Presentations, Papers, and Proceedings
Document TypeConference Proceeding
ConferenceASME 2008 International Mechanical Engineering Congress and Exposition
AbstractFluidized beds can be used to gasify biomass in the production of producer gas, a flammable gas that can replace natural gas in process heating. Modeling these reactors with computational fluid dynamics (CFD) simulations is advantageous when performing parametric studies for design and scale-up. From a computational resource point of view, two-dimensional simulations are easier to perform than three-dimensional simulations, but they may not capture the proper physics. This paper will compare two- and three-dimensional simulations in a 10.2 cm diameter fluidized bed with side air injection to determine when two-dimensional simulations are adequate to capture the bed hydrodynamics. Simulations will be completed in a glass bead fluidized bed operating at 1.5Umf and 3Umf , where Umf is the minimum fluidization velocity. Side air injection is also simulated to model biomass injection for gasification applications. The simulations are compared to experimentally obtained time-averaged local gas holdup values using X-ray computed tomography. Results indicate that for the conditions of this study, two-dimensional simulations qualitatively predict the correct hydrodynamics and gas holdup trends that are observed experimentally for a limited range of fluidization conditions.
Citation InformationMirka Deza, Francine Battaglia and Theodore J. Heindel. "Approximating a Three-Dimensional Fluidized Bed With Two-Dimensional Simulations" Boston, MA(2008)
Available at: http://works.bepress.com/theodore_heindel/25/