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• W3105890238 abstract "The use of biomass as replacement for fossil fuel has increasing interest. Since biomass is considered a sustainable energy source, the use of biomass is regarded as a solution to environmental problems and depleting energy supplies. Co-firing in pulverized coal furnaces is a common application of woody biomass. In these furnaces small fuel particles are combusted for electricity production. Due to differences in chemical and physical properties, replacing coal with biomass means that the combustion behavior inside the furnace changes. One of the main differences is the large amount of volatiles that is produced during biomass combustion. These volatiles are produced during the pyrolysis process. The goal of this investigation is to determine the influence of temperature, particle size and fuel properties on the conversion process of biomass. Therefore the pyrolysis process of biomass particles has been investigated. This has been done by modeling the pyrolysis processes governing the conversion of a single biomass particle. This has been approached in two steps. First, the chemistry without transport of wood pyrolysis has been investigated. This has been done by a literature study concerning the chemical composition and structure of woody biomass, reaction schemes describing biomass pyrolysis and kinetics of the concerning reactions. Second, the homogeneous model is extended to a particle model by introducing transport effects. With this model the effect of temperature of the environment and particle geometry has been investigated. The chemical pyrolysis model consists of a fuel model using three model species, namely hemicellulose, cellulose and lignin. Each fuel species is converted via two competing reactions into gasses and char. Gaseous product species are predicted using conservation of elements and enthalpy. By using two competing reactions, the effect of decreasing char yields for increased temperatures has been included. The results of the model have been compared with literature data. The particle model has subsequently been used to investigate the role of parameters controlling the transport of heat inside the particle. These are properties like conductivity, temperature, density and porosity. The chemical model predicts a decrease in char yields for increasing heating rates, this is inline with literature. The composition of gas phase products shows large differences with literature, most likely due to the absence of tar products in the model. From the particle model can be concluded that particles with diameters up to 2.0 mm are mainly controlled by chemical kinetics. Using a heating rate of 100 K/s, the model predicts a conversion time of approximately 9.5 seconds. The model also shows that gas phase chemistry is of minor importance inside the particle." @default.
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• W3105890238 date "2010-06-15" @default.
• W3105890238 modified "2023-09-26" @default.
• W3105890238 title "Modeling the pyrolysis process of biomass particles" @default.
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