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摘要
The numerical simulation of the burning process of municipal solid waste with high calorific value in a 900t/d incinerator was carried out. The FLIC and Fluent coupling method was used to study the secondary wind injection angle of the front and rear arches, the secondary wind of the front and rear arches and the secondary wind of the flue. The ratio of the internal combustion flow in the furnace, such as the combustion process of the waste in the furnace, the distribution of the flow field, the distribution of the main components of the flue gas, and the characteristics of the pollutant discharge were studied. The results show that the flue gas flow field, component concentration and pollutant emission in the incinerator are consistent with the field data under the same conditions. When the secondary wind injection angles of the front and rear arches are 67° and 47°, the temperature distribution in the furnace is uniform, and the high temperature corrosion on the wall is alleviated. The temperature of the first flue gas outlet reaches 907℃, and the furnace flame is symmetrically distributed at the center. The flue gas in the furnace is well mixed with the secondary air, and the NOx emission is 132. 5 mg/m3. When the ratio of the secondary wind of the burnout wind, the front arch and the rear arch is 0.38: 0.46: 0.16, the disturbance of secondary wind in the furnace is strong, the furnace flue gas and oxygen is fully mixed, and gas phase combustion is strong. The residence time of flue gas in the furnace is prolonged, thus combustible components are fully burned. The temperature field is concentrated in the middle of the furnace, and NOx emissions are reduced. ? 2020, Editorial Department of "Journal of Engineering for Thermal Energy and Power". All right reserved.
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