The ambient wind impact on eddy current distribution in air cooling island

摘要

With increasing ambient wind speed, eddy currents appear near condenser cells, affecting the thermal-flow performance of a direct air-cooled condenser. To examine the impact of ambient wind on the eddy-current distribution of an air-cooling island, a 2 × 600 MW direct air-cooling unit in North China was studied. To compare a series of different inlet wind speeds, the temperature and pressure distribution and the mechanism of and variation in eddy currents were studied. Moreover, the effects of ambient wind speed on the inlet flow rate of an axial-flow fan cluster were examined. Numerical results show that with increasing ambient speed, the chance of hot-air plume generation increases, resulting in a reduction in heat-transfer volume and efficiency. Additionally, more negative-pressure areas are created near the condenser cells. Vortices appear in the condenser-cell flow field, gradually becoming larger. The mass-flow rate of the axial flow fan cluster exhibits a downward trend with increasing ambient speed.