| Incineration used for disposal of Hazardous Waste has been widely spreaded abroad, because of its advantages of remarkable volume-reduction weight-reduction, small floor area and energy recovery which other methods don't have. Especially incineration fit the situation of China which is facing the insufficiency of land and energy. Consequently, the technology is being popularized in our country in recent years. Because the process of incineration of Waste will bring a lot of hazardous substance, installations for control synthesis of these substances should be builded. Flue gas quench tower which can prevent dioxins regeneration is one of these installations.Flue gas quench tower in the paper is different from other quench towers which use water to reduce the temperature of flue gas, it uses lime slurry instead of water. Therefore this flue gas quench tower have the capbability of desulfurization and dechloriantion besides cooling flue gas. Through numerical simulation, with the help of FLUENT, building the model of evaporation of lime droplet, desulfurization and dechloriantion is used to study distribution of velocity field, temperature field, efficiency of desulfuration and dechloriantion, the factors which have influences on operation of flue gas quench tower.First of all, after studying the process of evaporation of lime droplet, desulfurization and dechloriantion, the model of the process is established. The model is based on dual-film theory and shrinking core model. Through the model, efficiency of desulfurization and dechloriantion, three-dimensional distribution of velocity field, temperature field in flue gas quench tower are attainable.Through the model, the influences of Ca/Acid ratio, concentration of SO2 and HCl around inlet, temperature of flue gas around outlet, initial diameter of lime droplet and so on are being studied. The result indicates that different factors have different influences on flue gas quench tower. |
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