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During the combustion of coal and biomass blends, ash particles are deposited on the furnace wall, or on the heat transfer surfaces, and gradually they become sintered and harder. This makes it difficult to remove the deposits by soot blowing, and therefore manual cleaning is often required. In this paper, a computational fluid dynamics (CFD) model that predicts the deposition rates in boilers has...
At this time, the correlation between the existing coal slagging indices and the actual observations made in most conventional boilers is poor. Some of the conventional coal slagging test procedures and the empirical relations they generated, such as, coal fusibility, ash viscosity, silica ratio, percentage of iron oxide in ash, and the ratio of basic to acidic oxides, frequently offer misleading...
The slagging of heat transfer surfaces during the combustion of pulverized coal in power stations is a major problem as power generators strive to improve the efficiency of their plants. In this paper, a numerical model to predict ash deposition rates in boilers has been developed. The deposition model is based on the sticking tendency of ash particles on impaction on boiler walls. A numerical slagging...
A 3-dimensional model for an in-house proton exchange membrane (PEM) fuel cell with serpentine channels has been developed in order to investigate the sensitivity of the fuel cell performance to the anisotropic gas permeability and electrical conductivity of gas diffusion layers (GDLs). For a realistic range of transport properties being investigated, the fuel cell performance was found to be very...
A CFD model that simulates the combustion of biomass in existing pf coal fired furnaces has been developed and model results for the combustion of a typical wood in a 1MW industrial test facility have been presented. The model is primarily based on coal combustion submodels using an Eulerian–Lagrangian frame of reference. Biomass specific constants that define the submodels have been investigated...
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