| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for observing in a high temperature furnace capable of obtaining a clear image of a refractory wall surface for a long period by preventing a damage of an imaging unit and prolonging a lifetime of the unit and an observing lance used therefor. SOLUTION: The method for observing in the high temperature furnace comprises the steps of forming an observation window 26 penetrating a multiple tube water-cooled at its outside, disposing a CCD camera 21 in an inner tube of the multiple tube, providing a reflecting plate 25 between the camera 21 and the window 26, and imaging a furnace wall while supplying a cooling gas into an inner tube 13 and an outside of the tube 13. In this method, a cooling gas amount to be supplied into the tube 13 is increased as compared with the cooling gas amount to be supplied to the outside. A ratio of the cooling gas amount to be supplied to the outside to that to be supplied to the tube 13 is set to 1.2 to 2.0. The observing lance used for the method is provided.
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