介绍了哈尔滨第三发电有限责任公司 6 0 0MW机组回转式空气预热器存在的设备缺陷及改造措施。采用了双密封、中心轴传动和非接触式漏风控制系统 ,并对中心桁架进行了加固 ,改造后经黑龙江省电力科学院的测试表明 ,漏风率由改前的 1 5 %～ 2 0 %降低到 6 %以内 ,为国内同型机组最好水平 ,取得非常大的经济效益。表 1参 3 This paper introduces the equipment defects and retrofitting measures of the rotary air preheater of 600MW unit in Harbin No.3 Power Generation Co., Ltd. The double-seal, central shaft drive and non-contact air leakage control system are adopted, and the central truss is reinforced. According to the test of Heilongjiang Electric Power Academy after transformation, the air leakage rate is reduced from 15% ~ 20% before the change 6% or less, the best level for the same type of units in the country, made a very large economic benefits. Table 1 reference 3