近年来,送、吸风机大都已改造或采用了高效率的4-73型,然而,对于数量很多、耗电量大的排粉机则改造得较少。如国产400吨/时锅炉配用的排粉机仍是低效、前弯式叶片的7-29型,其运行效率普遍不到60％,甚至更低,而且一般富裕量偏大。因此,提高排粉机效率,将是省煤节电的一个重要措施。 In recent years, most of the sending and suction fans have been rebuilt or adopted the high-efficiency Type 4-73. However, for a large number of power-hungrs, the row of discharge machines has been rebuilt less. Such as domestic 400 tons / hour boiler with a row of powder machine is still inefficient, forward curved leaf type 7-29, its operating efficiency is generally less than 60%, or even lower, and the general margin of wealth is too large. Therefore, to improve the efficiency of the exhaust mill, energy saving will be an important measure.