| Some power stations adopted natural draft air-cooling system in North China where is rich in coal and is short of water. Appraisement for circulatint of air-cooling system consists of the appraisement for air-cooling system and the appraisement for air-cooling tower. My paper brings forward a scheme which used to improve chilling effect of air-cooling system basing on the examined table for the 3rd air-cooling system in Fengzhen power station. The scheme consists of two parts. One is to add an evaporative cooler near the condenser. The other is to add fans inside air-cooling tower. The ultima thule is to finish the designing of the scheme. The process of the first part designing inculdes thermal design optimization calculation, program design.The second part designing through numerical simulation.
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