Based on Simple algorithm and κ-ε model, combined with heat and mass transfer theory for air-water two-phase flow, 3D numerical simulations were carried out for a 600 MW direct air-cooling unit by using MRF model to treat the fan model, so as to analyze the influence of spray humidification on the condenser pressure. Results show that by applying MRF model to treat the fan model, the air spirals up in the unit, and both the air flow field and temperature distribution on heat exchanger is closer to actual conditions. The maximum pressure drop of condenser 8. 97 kPa appears when the nozzles are symmetrically arranged 3. 5 m away to trestle center of the fan, 1.6 m above the outlet plane of fan shell, and the angle between spraying direction and positive direction of y axis is 210° in the xy plane, with a nozzle pressure of 0. 8 MPa and nozzle diameter of 0. 4 mm.%基于Simple算法和k-ε模型,采用MRF模型处理风机模型,并综合两相流、传热传质理论,对某600 MW直接空冷机组的一个单元进行了三维数值模拟,分析了喷雾增湿对空冷凝汽器压力的影响,结果表明:应用MRF模型处理风机后,单元内空气旋转上升,空气流场和换热器表面温度场分布更接近实际情况；喷嘴距风机栈桥中心线3.5m、距风机导流筒出口平面高度1.6m,喷雾方向在xy平面与y轴正向夹角210°、喷嘴压力为0.8 MPa、喷嘴孔径为0.4mm时,凝汽器压力降幅最大,为8.97 kPa.
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