BACKPASS LOWER HEADER 包墙下集箱
Water wall LOWER HEADER 水冷壁下集箱
lower oil header 下集油箱
Lower circulation header 下循环集箱管
A multitude of ring-shaped cracks and three water leakage points were discovered in the right side lower header of a boiler together with a cave-in of the boiler roof water-cooled wall.
锅炉右下集箱产生了很多环状裂纹和三个渗水点，同时顶棚水冷壁管塌陷。
Tube bundle fix the drooped structures through welding for both ends of upper header and make fly ash drop by rapping the end plate of lower header.
锅炉中的管束是上部集箱的两端通过焊接固定垂下的结构，通过锤打下部集箱的端板，振落飞灰。
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