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应用气水两相流的传热传质理论,建立了600 MW直接空冷机组空冷凝汽器喷雾增湿系统三维数学模型,利用CFD软件对该系统进行了数值摸拟,并分析了在喷嘴纵向布置时,喷嘴布置高度、喷雾方向、喷雾压力及喷嘴孔径对喷雾增湿效果的影响.结果表明:当喷嘴孔径越小、喷嘴流量越少时,空冷单元内所需的喷嘴数就越多,且雾滴雾化的细度越小,越有利于雾滴的均匀分布及其在空冷单元内的充满度,对喷雾增湿的效果越明显.当喷嘴孔径为0.4 m、喷雾压力为1.2 MPa、喷嘴以对称方式距风机栈桥中心线4 m、喷嘴高度为0.3 m及喷嘴方向在xy平面内与y轴正方向夹角为120°时,凝汽器压力降幅最大,比喷雾前降低了8.84 kPa.
Based on the theory of heat and mass transfer of gas-water two-phase flow, a three-dimensional mathematical model of spray humidification system for air-cooled condenser of 600 MW direct air-cooled unit was established. The numerical simulation of the system was carried out by CFD software. The results show that when the nozzle diameter is smaller and the nozzle flow rate is less, the number of nozzles required in the air cooling unit is more, The smaller the atomization atomization, the more advantageous to the uniform distribution of the droplets and their fullness in the air cooling unit, the more obvious the effect of the spray humidification.When the nozzle aperture is 0.4 m, the spray pressure is 1.2 MPa , Nozzle symmetry from the center of the fan trestle 4 m, the nozzle height of 0.3 m and the nozzle direction in the xy plane and the positive y-axis angle of 120 °, the maximum condenser pressure drop, lower than before the spray 8.84 kPa.