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根据宏观检查、化学分析、金相检验、裂纹形貌和裂纹成因分析 ,认为锅炉汽包在开孔内壁处产生裂纹的主要原因是由于锅炉进水口供水温度过低 ,过冷水从进水管冲入汽包 ,碰撞到档水板引起过冷水飞溅到汽包开孔内壁处 ,使该处产生温差应力而导致裂纹。提出了增加防护板或改进进水方式等有效的修复方法和预防措施
According to macroscopic examination, chemical analysis, metallographic examination, crack morphology and crack cause analysis, it is considered that the main reason that the boiler drum cracks in the inner wall of the hole is that the temperature of the water supply in the boiler inlet is too low, Drum, collision to the water board caused by the supercooled water splashing to the inner wall of the steam drum openings, so that the temperature difference between the stress and lead to cracks. Proposed to increase the protection board or improve the water way and other effective methods of repair and preventive measures