A new type of moving petticoat pipe structure and petticoat pipe seal which fit for forced circulation way is introduced.A kind of flexible fastening of moving petticoat pipe is also recommended.

• 并介绍了一种适合强制循环方式的新颖的活动烟罩和烟罩密封形式，推荐了一种活动烟罩管道柔性连接件。