In English

Evaluation of Comsol Multiphysics for modelling of fluidized bed combustion

Elisabeth Cima
Göteborg : Chalmers tekniska högskola, 2015.
[Examensarbete på avancerad nivå]

Fluidized bed (FB) combustion offers an efficient and flexible way of producing heat and power from a large range of solid fuels. The installed capacity of FB boilers has increased steadily over the last years and there are today units as large as 460MWe. The continued development and scale up of FB boilers require research, where an important tool that could assist the development is modelling of the combustion processes. Due to the complex fluid dynamics and fuel conversion phenomena in FB boilers, comprehensive modelling of these units require simplified ways to describe the combustion process. In the present work, a model describing the mass and heat transfer in a bubbling fluidized bed (BFB) has been implemented in Comsol Multiphysics, version 5.1. The aim of the work is to investigate the possibilities and challenges of using Comsol for modelling of FB boilers. Reasonable results are obtained for the mass balance whereas further work is required for the coupled mass and heat balance. It is concluded that Comsol offers a flexible environment for this type of modelling. However, the flexibility is also challenging, and more complex models require a solid knowledge about the software.

Nyckelord: Fluidized bed combustion, Modelling, Comsol Multiphysics

Publikationen registrerades 2015-08-05. Den ändrades senast 2015-08-05

CPL ID: 220197

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