各种燃油锅炉和工艺加热炉的烟道气管线一般采用内保温办法来隔热和防腐,以内保温阻止烟气中硫的氧化物当温度降低到露点温度时产生的酸腐蚀。烟气管道上设置的供温度膨胀用的波形补偿器,以往也常采用内保温隔热结构,即在波形补偿器的导流内套筒内填以一定厚度的隔热层(如图1)。我厂常减压装置空气预热器的冷、热烟气管道(温度为135～380 The flue gas lines of various oil-fired boilers and process furnaces are generally insulated and preserved with internal insulation to prevent acid oxidation of the sulfur oxides in the flue gas as the temperature decreases to the dew point temperature. The flue gas pipeline set up for the temperature expansion with the waveform compensator, often used in the past, thermal insulation structure, that is, the waveform compensator diversion within the sleeve filled with a certain thickness of the insulation layer (Figure 1) . I plant atmospheric decompression device air preheater cold and hot flue gas pipe (temperature of 135 ~ 380