To provide a method and instrument for measuring the diameter of a molten iron tapping hole of a blast furnace with which the diameter of spouting flow can precisely be measured by picking up the heat image of molten iron-molten slag spouting flow flowing out from the molten iron tapping hole of the blast furnace and separating a trough-staying part from the picked-up images.
With respect to two-dimensional distribution of heat-radiation brightness in the molten iron-molten slag spouting flow 8 flowing out from the molten iron tapping hole 4 in the blast furnace, several images are picked up at high speed shutter having short exposing time and the difference of the brightness among the plurality of images is calculated to generate the differential absolute value image. The spouting flow 8 is picked up as a dappled pattern separating the molten iron and the molten slag by picking up with the high speed shutter. Since the dappled pattern is shifted accompanying the flowing of the spouting flow, the spouting flow part has the dappled pattern of the differential absolute value image. The staying part 9 can be discriminated with the spouting flow part because the differential absolute value thereof is small and therefore, the diameter of the molten iron-molten slag spouting flow 8 can be measured based on the differential absolute value image.
COPYRIGHT: (C)2007,JPO&INPIT
Yamamoto Daikan
Yohei Otani
Shinroku Matsuzaki
Manabu Kuninaga
| JP9209013A | ||||
| JP8269531A |
Hisataka Tanaka