| 摘要 |
A device for injecting an atmospheric gas into an annealing furnace is provided to prevent surface defects from being formed on a surface of a strip by fundamentally preventing dust from being generated in the annealing furnace using an injection pressure of the atmospheric gas, and improve annealing quality of the strip by maximally reducing a temperature difference between an atmospheric gas newly injected into the annealing furnace and an atmospheric gas in the annealing furnace. A device(10) for injecting an atmospheric gas into an annealing furnace(100) comprises: a central shaft(12) which supports the atmospheric gas injecting device within the annealing furnace, which is formed in an inner part of the ejection pipe, and which has a spiral partition plate(13) formed on an outer peripheral surface thereof; an ejection pipe(9) which encircles the central shaft and sealed within the annealing furnace, and which has at least one nozzle(19) formed in a lower part thereof; and an atmospheric gas injection pipe which is connected to an atmospheric gas supply pipe of the outside and is, together with the central shaft, led in an inner side of the annealing furnace to be connected to an inner side of the ejection pipe. |
