环境风对某600MW直接空冷凝汽器影响的数值分析

Numerical Analysis of Impact for Environmental Wind upon Air-cooled Island of a 600MW Direct air-cooled Unit

以某600MW直接空冷机组为例,利用CFD软件对其建立数值模型,采用Fluent软件对流场进行数值模拟。通过数值模拟,分析了环境风对直接空冷凝汽器换热影响。计算结果指出:当风速小于2m/s时环境风对凝汽器换热基本没有影响,当风速大于7m/s时,凝汽器换热恶化严重;在风速由0m/s上升至13m/s时空冷凝汽器的风机流量偏差率增加了41%;当风速由2m/s上升至7m/s时换热效率降低了14.1%;指出了环境风温变化对凝汽器换热的影响。通过分析获得了环境风速、风温变化对直接空冷凝汽器的影响,为空冷凝汽器进一步优化设计提供了理论依据。

A numerical model for a 600 MW air-cooled island numerical simulation of the flow filed of it was made with FLUENT. the impact of the direct air-cooled condenser exchanger flow effects was made by By numerical environmental CFD software, the simulation, analys wind. The results indicate that： environmental wind basically have no impact on the condenser heat exchanger when the wind speed is less than 2m/s, but it is serious deterioration when the wind speed is greater than 7m/ s; The flow rate of deviation of air-cooled condenser fan increases 41% when the wind speed increased from 0m/s to 13m/s; Heat transfer efficiency of 14.1% when the wind speed increased from 2m/s to 7m/s; Pointed out the impact of changes in the environmental air temperature on the condenser heat exchanger. The results indicated the influence of the change of environmental wind speed and temperature on the direct air-cooled condenser. The research results provide some theory evidence for the optimization of the effect of air-cooled island＇s heat transfer.