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石门电厂2×300MW机组容克式空气预热器漏风大、且漏风越来越严重,需改造密封系统、降低漏风率。 在理论上分析了空气预热器的热态变形规律后,采用了双密封削弱空气侧与烟气侧漏风压差、扇形板和轴向弧形板与 转子间隙采取自密封、密封片做成“V”形、减小转子中心筒和其他有关部位理论值与实际值偏差的改造方案。对2台 机组空气预热器密封改造后,漏风从20%下降到7%～9%。
Shimen Power Plant 2 × 300MW unit Junker air preheater leakage, and more and more air leakage, the need to transform the sealing system to reduce air leakage rate. After theoretical analysis of the thermal deformation of the air preheater, a double seal is adopted to weaken the pressure difference between the air side and the flue gas side, and the self-sealing of the sector plate, the axial arc plate and the rotor gap is adopted, and the sealing sheet is made “V” shape, reducing the center of the rotor and other related parts of the theoretical value and the actual value of the deviation of the transformation program. Air compressor on the 2 units after the seal modification, air leakage dropped from 20% to 7% to 9%.