The work principle and maintenance method of bottom gas-feeding brick in top-bottom duplicate blown converter are stated, it is proposed how to make the bricks synchronized with furnace life.

• 论述了顶底复吹转炉底部供气砖工作原理、维护方法，提出了如何操作才能使底部供气砖与炉龄同步的理论与具体措施。