空气预热器是火力发电厂主要辅助设备之一,它利用省煤器后排出的烟气热量加热进入锅炉燃烧所需的空气,以利于燃料的着火和燃烧,并可降低排烟温度以提高锅炉效率。回转式空气预热器同管式相比,具有结构紧凑,钢耗少、容易布置等优点,在大容量机组尤其是300MW以上容量的机组上得到了广泛应用。但缺点是漏风率较大,且随运 Air preheater is one of the main auxiliary equipment of thermal power plants. It uses the heat of flue gas discharged from the economizer to heat the air required for combustion in the boiler to facilitate the ignition and combustion of fuel and reduce the exhaust gas temperature to increase Boiler efficiency. Compared with the tube type, the rotary air preheater has the advantages of compact structure, less steel consumption, easy arrangement and the like, and has been widely applied to a large-capacity unit, especially a unit with a capacity of 300 MW or more. But the disadvantage is the larger air leakage, and with the transport