Manufacturing methods for furnace monitoring devices, melting furnaces, and molten iron.

Abstract

A furnace monitoring device is provided, which can clearly observe the interior of a melting furnace where chilled iron is melted. Furthermore, a melting furnace equipped with this device is provided, which can efficiently obtain molten iron, and a method for manufacturing molten iron using the melting furnace is provided. The furnace monitoring device comprises: a front lens; a relay lens, consisting of one or more lenses; an inner tube containing the aforementioned front lens and relay lens; an outer tube containing the aforementioned inner tube; a camera device disposed on the outside of the furnace in the axial direction of the aforementioned relay lens; and a bandpass filter disposed in front of the aforementioned camera device in the imaging direction; wherein the aforementioned front lens and relay lens are far-infrared lenses; the aforementioned camera device is a far-infrared camera; and the aforementioned bandpass filter allows at least a portion of the wavelength range containing far-infrared wavelengths to pass through.

Images