我厂锅炉按原设计均为高温高压煤粉锅炉,空气预热器系管式,管径φ40×1.5毫米,立式布置。预热器共分三级,上部两级高3.4公尺,末级高1.7公尺。于1968年下半年开始,锅炉改烧油。燃油含硫量一般为1%左右,最高达1.4%。烟气露点较高,因 I plant boiler according to the original design are high temperature and pressure pulverized coal boilers, air preheater tube, diameter φ40 × 1.5 mm, vertical layout. Preheater is divided into three levels, the upper two high 3.4 meters, the final high 1.7 meters. In the second half of 1968, the boiler switched to oil burning. The fuel sulfur content is generally about 1%, up to 1.4%. Flue gas dew point higher, because