There exist problems of short service life and high accident rate on cooling fule with vaporizing and motive smoke bell of No.2 converter in Laiwu iron and steel Co.

• 莱钢2%23转炉汽化冷却烟道、活动烟罩存在使用寿命短、事故率高等问题,分析其原因是炉口段设计不合理、烟道径向热膨胀量无法释放、水封行程短、水封内积渣严重、烟道隔板易疲劳损坏等。