PURPOSE: To prevent and maintain the closure of an observation hole by providing an observation hole on the side wall of a converter while a photoconductive detection probe is inserted thereinto to observe light in the furnace and an oxygen-containing gas is blown off at the tip of the detection probe.
CONSTITUTION: Oxygen is blown into a molten iron 17 and a slag 16 in a converter 1 from a lance 19 to extract phosphor and sulfur. An observation hole 4 is provided on the side wall of the converter 1 and a photoconductive detection probe body 6 is inserted thereinto. A detection probe 61 is provided on the body 6 to detect light in the converter, which is converted into electricity to detect the condition of slagging by measuring the wavelength. At this point, an inert gas such as N2 is introduced into an outer cylinder 62 of the detection probe 61 from an introduction port 63 and blown off at the tip 42 thereof to prevent contamination at the front of the probe 61. In addition, the mixture of O2 and the inert gas is introduced into the outer cylinder 64 from an introduction port 65 and blown off at a gas outlet 66 to prevent the closure of the observation hole 4. Thus, the mixing of the mixed gas with O2 can prevent the closure of the observation hole sufficiently checking the lowering of the temperature thereby assuring accurate internal observation of a converter.
UEDA YUUJIROU
NARITA YUTAKA
YOSHIDA TOORU
| JPS5827030A | 1983-02-17 | |||
| JPS5230483A | 1977-03-08 |
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