漩涡撞击法烧结脱硫烟气流场仿真研究

Simulation studies on the flow field of sintering flue gas during vortex collision desulfurization

采用Fluent软件对均气环、冷却预处理器和漩涡撞击元件三项关键技术进行模拟仿真,并用MATLAB拟合其对烟气流场的影响规律.结果表明:烟气分布最优时,均气环安装位置与宽度呈线性关系时;冷却预处理器喷水速度越大,烟气温度越低,当喷水速度大于30m.s-1时,随着喷水量增大,温度变化不明显,最佳喷水速度范围为25～30m.s-1;压力损失随漩涡撞击元件切向速度的增大而增大,当切向速度大于20m.s-1时,压力损失急剧上升,漩涡撞击元件最大切向速度应该控制在20m.s-1左右,即托盘转速应该为85r.min-1左右.

ABSTRACT Fluent software was used to numerically simulate the functions of three key components （gas distributed ring, cooling pre-processor, and vortex collision component） during vortex collision desulfurization. The influence rules of the three components on the flow field of sintering flue gas were fit with MATLAB software, It is shown that under the optimal distribution of flue gas the installa- tion location of the gas distributed ring is linear with the ring width. The greater the water-jet velocity from the cooling pre-processor, the lower the temperature of flue gas is. When the water-jet velocity exceeds 30 m·s ^-1, the temperature of flue gas does not change sig- nificantly with increasing water-jet velocity; as a result, the best range of water-jet velocity is 25 to 30 m·s^-1. The pressure loss of flue gas increases with the tangential velocity of the vortex collision component increasing. When the tangential velocity is over 20 m·s^-1, the pressure loss rises sharply. The tangential velocity of the vortex collision component should be controlled at about 20 m·s^-1 , indica- ting that the rotational speed of the tray is about 85 r.min^-1.