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某调峰机组再热器联箱内壁发生腐蚀。腐蚀形貌观察与腐蚀产物能谱分析表明,该腐蚀为点蚀,机组停用积水的溶解氧是导致点蚀的根本原因。受机组运行模式的影响,该点蚀产生以下特征:腐蚀发生在停用积水水线下,特别严重的区域为近水线附近、联箱管孔下部积水流淌区域、根部焊缝及其两侧熔合线;蚀坑口呈开放状,腐蚀产物未覆盖其上;运行时受蒸汽冲刷程度强烈的区域,蚀孔呈规则圆形,分散分布,冲刷程度相对较弱的区域,蚀孔数量减少,呈不规则圆形,部分蚀孔发生聚集。为了防止停用期间的腐蚀,在采用相应停用保护措施的前提下,还必须消除存在的积水。
A peaking unit reheater tank wall corrosion. The observation of corrosion morphology and energy spectrum analysis of corrosion products show that the corrosion is pitting corrosion, and the dissolved oxygen which deactivates water from the unit is the fundamental cause of pitting corrosion. Affected by the mode of operation of the unit, the pitting corrosion has the following characteristics: corrosion occurs in the deactivated water line, especially in the area near the waterline, in the lower part of the header pipe, in the water flowing area, in the root weld and its The corrosion pit is open and the products of corrosion are not covered. During the operation, the area with strong degree of steam flushing has regular holes, scattered holes and relatively weak erosion, and the number of holes drilled decreases , Was irregularly circular, part of the hole erosion occurred aggregation. In order to prevent corrosion during deactivation, the presence of stagnant water must also be eliminated on the premise of appropriate deactivation protection measures.