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RIGS OF RODS THOMAS C2 BY ED CODE
Eight different sticking criteria are implemented in a computational fluid dynamics code and computations are compared against measurements from an entrained flow reactor. Sticking criteria are presented, their required parameters are discussed and typical particle and surface properties found in combustion systems, are summarized. These properties are essential in order to describe the particle sticking and rebound behavior.Īsh particle sticking and rebound criteria can be divided into three main groups, based on either: (1) the particle melt fraction, (2) the particle viscosity, or (3) the energy dissipation of a particle, upon impaction.
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Ash transport and deposition mechanisms as well as their mathematical description are given and discussed, together with composition- and temperature-depended models for the estimation of ash particle and deposit properties. This review presents an overview of major ash forming elements found in biomass and coal, and discusses the heterogeneity of particles’ inorganic composition. If all kinetic energy is dissipated during the impact, the particle will remain on the surface. Furthermore, the particle kinetic energy and the angle of impaction, are crucial parameters. On the contrary, the stickiness of salt-rich ashes – typical for herbaceous biomass and wood- or waste-based fuels – is often described using the liquid melt fraction. The main properties affecting the particle stickiness are the viscosity and surface tension for silicate-rich ashes. For instance, a particulate deposit might capture incoming particles or be removed due to erosion, while a molten layer will collect all impacting particles, no matter if they are sticky or not. The impaction of solid, molten or partially molten particles on surfaces is dependent on the particle and surface characteristics. A substantial part of the fuel can be inorganic, forming inorganic vapors and ash particles. The purpose of this paper is to review the present knowledge on ash formation, ash particle transport and deposition during solid fuel combustion, with emphasis on particle sticking and rebound behavior.
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