| The nanosizedTiO2 application in the field of treat sewage, clean air and anti-corrosion metal is regarded more and more importance because of his excellent characteristics, such as catalysis is well, very steadily in the air, nontoxic and cheap. The nanosizedTiO2 application and preparation methods of low cost and high grade are attracting more and more researchers.In this dissertation, the experimentation of TiO2 nanoparticles synthesized by the TiCl4 in methane /air flame have been investigated. Counting for particle from SEM and XRD pictures, size characteristics of particle and particle figure at different operational conditions have been obtained. The results indicate most of product is anatase, rutile is little, particle size is about 50nm to 70nm. The effects of flame temperature and the flow rates of fuel, air and TiCl4 on the particles and aggregates are also analyzed.The growth process of titania nanoparticle synthesized in the combustion are simulate by turbulent models. This dissertation performed the flame numerical simulations of Standard k-ε,RNG k-εand RSM turbulent models at Standard Wall Function and Non-Equilibrium Wall Functions. The calculated results show that RNG k-εturbulent model at Non-Equilibrium Wall Functions produces reasonable predictions for the temperature profile and the shape of the flame, and on the base of this turbulence model, the temperature profile and the shape of the flame are calculated with the pseudo-component titania. To simulate the coagulation and sintering process of titania in this flame, assume the precursor molecules to free TiO2 monomer molecules occurs instantaneously when the TiCl4 enter burner. By using the additional fluid-particle dynamics, the sintering process of TiO2 in the flame is computed. Particle number density and particle size at different height levels have been obtained. The influencing factors in the process of nanoparticle formed are discussed, the result of simulation and experimentation are compared. |
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