A master thesis from Aalborg University
Investigation of Oxy-Fuel Combustion in a Circulating Fluidized Bed Boiler in Ansys Fluent® Without Incorporation of User Defined Functions
Author(s)
Term
4. term
Education
Publication year
2024
Submitted on
2024-05-30
Pages
69 pages
Abstract
This project investigates the capability of the Ansys Fluent® software, within the field of combustion and multiphase flow, without the incorporation of User Defined Functions (UDF). Additionally, different particle tracking methods/models are compared, namely the Discrete Element Method (DEM) and the standard Kinetic Theory of Granular Flow (KTGF) model. The KTGF was found to be easier implemented while requiring less computational time compared to the DEM, which was concluded to require 20% longer computational time. Eddy-Dissipation was chosen in favor of Eddy-dissipation/Finite rate due to the slow kinetic rates, as a result the volatiles did not combust. Four simulations have been compared with the experimental data, where simulation one showed a mean deviation of 47%, while simulation four had a deviation of 21.6%. Lastly, it was concluded that the Fluent® software is able to deliver reasonable results in multiphase-combustion simulations without the use of UDFs, and that the deviations are a result of insufficient computational time and mesh quality, rather than a lack of UDFs.
Documents
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