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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600MW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0.8MPa、喷嘴孔径为0.4mm时,凝汽器压力降幅最大,为8.97kPa.
Based on the Simple algorithm and the k-ε model, the MRF model was used to process the fan model. A three-dimensional numerical simulation of a unit of a 600MW direct air-cooled unit was carried out based on the two-phase flow and heat and mass transfer theory. Condenser.The results show that after the fan is treated by MRF model, the air rotation in the unit rises, the air flow field and the temperature field distribution on the heat exchanger surface are closer to the actual situation. The nozzle is 3.5m away from the centerline of the fan trestle bridge, The outlet height of the draft tube is 1.6m, the spray angle is 210 ° in the xy plane and the positive direction of the y-axis, the nozzle pressure is 0.8MPa, and the nozzle aperture is 0.4mm. The maximum pressure drop of the condenser is 8.97kPa.