锅炉的水冷壁管、过热器管、省煤器管(简称三管)处于高温并受烟气飞灰冲刷的条件下工作,同时存在烟气和管内介质流速分布的不均匀性,燃烧室温度的偏斜,盐垢的沉积等不良因素,使管子产生不同速度的磨损和胀粗,导致强度逐渐降低,最终发生爆管。“三管”的爆破事故是发电厂频发事故之一,约占锅炉事故的三分之一。因此,在检修中应检查管子外表面有无裂纹、折迭、结疤等缺陷并予以消除。同时,建立严格的炉管检查管理制度,全 Boiler water wall tube, superheater tube, economizer tube (referred to as the three tubes) at high temperature and flue gas erosion under the conditions of flue gas, while there is smoke and the tube flow velocity distribution of non-uniformity, the combustion chamber temperature Of the deflection, the deposition of salt scale and other undesirable factors, the tube produces different speeds of wear and swelling, resulting in the gradual reduction of strength, the final burst pipe. The “three tubes” blasting accident is one of the frequent accidents of power plants, accounting for about one third of the boiler accidents. Therefore, in the overhaul should check the outer surface of the tube without cracks, folding, scarring and other defects and be eliminated. At the same time, establish a strict inspection management system, all