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为了提高高炉煤气重力除尘器的除尘效率,在高炉煤气重力除尘器内采用了安装漏斗型挡板和将进气管由中心管改为锥顶进气2项技术。采用FLUENT软件对除尘器内的气相流场和颗粒的运动轨迹进行数值模拟。模拟结果表明:改变进气方式以后,与旋风除尘器相似,在重力除尘器内部产生了旋流;加入挡板后,在挡板下部形成一个气流死区,避免了二次扬尘的出现,而含尘气体与挡板间的碰撞是颗粒被分离出来的主要原因。固体颗粒的运动轨迹较为复杂,且带有一定的随机性,计算得出的除尘效率和实际试验数据吻合较好。
In order to improve the dust removal efficiency of the blast furnace gas gravity dust remover, a funnel-type baffle was installed in the blast furnace gas gravity dust remover and two technologies were adopted to change the inlet pipe from the center pipe to a cone-top gas inlet. FLUENT software is used to simulate the gas flow field and particle trajectory in the precipitator. The simulation results show that after changing the inlet mode, similar to the cyclone, swirling flow is generated inside the gravity precipitator. After the baffle is added, a dead zone of air flow is formed at the lower part of the baffle to avoid the occurrence of secondary dust. The collision between the dust-laden gas and the baffle is the main reason that the particles are separated. The trajectory of solid particles is more complicated, with a certain degree of randomness. The calculated dust removal efficiency is in good agreement with the actual experimental data.