中文摘要：

利用商用CFD软件Fluent，采用κ-ε湍流模型和SIMPLE算法，对新型伞罩型湿式脱硫除尘塔内的三维两相流场进行数值模拟，发现了塔内烟气人口处流场所存在的不均匀性。为将其流场调节均匀从而提高脱硫除尘效率，在数值模拟的基础上提出在入口处加装直导流板、阶梯导流板和弯曲导流板，并分析塔内y=0截面速度的分布，以及z=0．21m截面上的颗粒浓度、速度和压力等参数的分布。结果表明：通过加装阶梯导流板和弯曲导流板均可以将流场调节均匀，达到较理想状态，从而实现高效净化气体的目的。模拟结果对设备的优化设计和实际运行有一定的指导作用。

英文摘要：

Adopting the κ-ε model and the SIMPLE algorithm, the 3-D two-phase flow field in the new canopy wet desulfurization dust tower is simulated with the commercial CFD software of Fluent. The existing problems of asymmetric flow-fields at the inlet of the tower were revealed. In order to adjust the flow-fields and improve the efficiency of desulfuration and dedusting, fixing the straight rectifying plates, stepped shape plates or curved shape plates at the inlet is presented on the basis of the numerical simulation. The distribution of the velocity in the section on the y =0 and fly-ash concentration, velocity and pressure in the section on the z =0.21 m were analyzed. Simulation results show that the flow fields in the tower can be adjusted to an ideal state by fixing the stepped shape plates and curved shape plates, so that the dust gas can be purified with high efficiency. Furthermore, the simulation results are of major significance for the optimization design and practical operation of the tower.