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地上进风直接空冷机组受环境风影响,边缘风机出现热风回流和“倒灌”现象,使机组换热效率降低、凝汽器压力升高,为此提出了单风道地下进风的冷却方式。利用数值模拟Fluent软件,对某600 MW机组空冷岛外部流场进行了数值模拟,分析地下进风方式下风机通风量、机组换热效率和凝汽器压力受环境风影响情况,并与地上进风方式相比较。实验结果表明,采用地下进风方式极大地提高了凝汽器的换热效率,使凝汽器压力维持在较低且平稳的状态,保证机组安全经济运行。
The direct air-cooling unit above the ground winds is affected by the environmental winds, and the hot air backflow and “backfill ” phenomenon occurs at the edge fans, thus reducing the heat transfer efficiency of the unit and increasing the pressure of the condenser. Therefore, the way. Numerical simulations of Fluent software were used to simulate the flow field outside a air-cooled island of a 600 MW unit. The results showed that the ventilation rate of the fan under the underground inlet air mode, the heat transfer efficiency of the unit and the condenser pressure were affected by the ambient wind, Wind compared to the way. Experimental results show that the use of underground air intake greatly improves the heat transfer efficiency of the condenser and maintains the condenser pressure in a relatively low and steady state, thus ensuring the safe and economic operation of the unit.