Air-Cooling Condenser Layout of 2×1 000 MW Direct Air-Cooled Units under Effect of Ambient Natural Wind

doi:10.3969/j.issn.1000-7229.2015.06.002

Abstract

Abstract:

Air-cooled condensers (ACCs) of direct air-cooled plant with unit capacity of 1 000 MW have huge size and more cells, and the inhomogeneity of system performance in space distribution by ambient wind is obvious. The optimization of the structure and layout can provide feasible technical approach for 1 000 MW ACCs to replay to ambient wind. On the basis of 2×1 000 MW direct air-cooled units, this paper constructed physical and mathematical models with considering the coupling effect of ambient wind and air flow from unit fans, and presented the three-dimensional distribution of flow and temperature fields by using numerical simulation method. Then the variation mechanism of the cooling ventilation flow rate and heat transfer performance of ACCs with wind speed and distance between ACCs and the main buildings was explained, especially for the wind from boiler house which was most unfavorable. The results show that the heat thermo-flow performance of ACCs is decreased with the increase of the wind speed. With the increase of wind speed, the heat capacity decreases more rapidly when the distance between ACCs and the main buildings increases. When the wind speed is over 6 m/s, the exhaust plume recirculation flow ratio increases with the distance increases; the heat transfer performance of 15 m is better than other more lager distance. Therefore it’s benefit to resist adverse effect by strong wind with tight air-cooled plant layout at high wind speed.

Key words: direct air-cooled, air-cooled condenser (ACC), thermo-flow performances, distance, exhaust plume recirculation flow ratio

CLC Number:

XIAO Liehui， DU Xiaoze， YANG Lijun， XI Xinming. Air-Cooling Condenser Layout of 2×1 000 MW Direct Air-Cooled Units under Effect of Ambient Natural Wind[J]. ELECTRIC POWER CONSTRUCTION, 2015, 36(6): 7-13.

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