Numerical Simulation Of Combustion And Pollutant To Circulating Fluidized Bed Waste Incinerator

Fluent software is used to simulate a circulation fluidized bed waste incinerator of its combustion and pollutants.The paper, food waste, mixed waste and coal are chosen as fuel. The result is shown that: combustion is instable and the temperature is low when food waste and mixed waste is burnt in boiler.However, the temperature of boiler is similar as the paper and coal is combusted in the boiler.Furnace exit The NOx average concentration for outlet is less than 200 ppm. Because of the temperature and their sulfur content, NOx concentration is the highest when coal is burnt while the least when the paper is combusted. The coal of Huainan and mixed waste are combusted at the same time, the temperature and concentration of nitrogen oxide all increases. For dioxin pollutant, it is mainly analysed by temperature field of the boiler.Studies are shown that the dioxin is rarely generated as the temperature is above 850℃.The residence time of flue gas is extended by increasing the height of boiler,that could restrict the formation of dioxin. At the same time,it is said that temperature and nitrogen oxide concentration of outlet also decreases.The concentration of SO₂ is also calculated.