Simulation Study on Combustion of Coal Powder Injected into Blast Furnace Tuyere
In order to reduce the coke ratio in the ironmaking process of blast furnaces,modern blast furnaces use coal powder injection through tuyere to replace some coke.By using the design parameters and production data of a certain blast furnace as simulation conditions,a three-dimensional model of coal powder combustion in the tuyere swirling zone of the blast furnace is established,and the coal powder combustion phenomena in the lower area of the blast furnace,such as the straight blowing tube,coal powder spray gun,tuyere,swirling zone,and coke bed,are simulated and studied,and the reliability of the model is verified by combining the production data provided by the blast furnace.The simulation results show that the hot air leaves the wind outlet and enters the swirling zone,with a maximum speed of 257 m/s,and then continuously decreases.After coal powder enters the blast furnace,volatile matter begins to precipitate at a distance of 0.4 m from the tuyere section in the swirling zone,forming a high-temperature zone of 2 600 K at a distance of 1 m from the coal powder spray gun in the swirling zone.Part of the coal powder with a particle size greater than 70 μ m enters the coke bed and moves upward along the center of the furnace cylinder before complete combustion in the swirling zone,resulting in a low burnout rate and affecting the permeability of the blast furnace.
万方数据
维普
