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1 热水锅炉水管烟侧腐蚀特点热水锅炉水管烟侧开始出现明显腐蚀现象,一般是在锅炉安装投用三年后,腐蚀的水管大多是靠炉墙或炉拱的水冷壁管及对流管,腐蚀严重的部位一般在水管靠墙侧,尤其是水管弯曲部分;水管外壁腐蚀均为溃疡性凹坑腐蚀,部分水管外表面有较厚的黑色氧化铁;在水管与炉墙、炉顶或炉拱接触处,均有积灰现象,烟灰中含有灰白色或微黄色的结晶物,该结晶物极易溶于水,其水溶液pH为3～5,呈强酸性。经调查统计发现,锅炉出水温度越低,水管烟侧腐蚀越严重;锅炉积灰越多,水管烟侧腐蚀越严重。
1 hot water boiler pipe smoke side corrosion characteristics Hot water boiler pipe smoke side began to appear obvious corrosion, usually after the boiler is put into use three years, the corrosion of water pipes are mostly by the furnace wall or furnace arch water wall tubes and convection pipe , The site of serious corrosion is generally on the side of the pipe against the wall, especially the curved part of the pipe; corrosion on the outer wall of the pipe is ulcerous pit corrosion, and thick iron oxide on the outer surface of some of the pipes; Furnace arch contact, have fouling, soot contains gray or yellowish crystals, the crystal is very soluble in water, the pH of its aqueous solution of 3 to 5, was strongly acidic. The survey found that the lower the boiler water temperature, the more serious pipe-side smoke corrosion; boiler fouling more water pipe side of the more serious corrosion.