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Energy saving for draught fan is analysized and researched, and different reform programs are put forward for a 250MW thermal power unit in this paper:(1) restructuring;(2)fluid coupling;(3)frequency control . Three programs were able to save 700,000, 1,170,000 and 1,720,000 yuan . The comparison of energy efficiency for three programs is analysized. Frequency control is an advanced, practical, reliable technique, power consumption of draught fan, operating cost and generating cost will be reduced. Selection of frequency control is economic and feasible. Loss in process of design can be reduced and operating efficiency and output can be improved to optimize the operation way of Draft Fan, while avoiding revamping of equipment.
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