896results about "Cooling devices" patented technology

The present invention is an apparatus and method for the direct reduction of iron oxide utilizing a rotary hearth furnace to form a high purity carbon-containing iron metal button. The hearth layer may be a refractory or a vitreous hearth layer of iron oxide, carbon, and silica compounds. Additionally, coating materials may be introduced onto the refractory or vitreous hearth layer before iron oxide ore and carbon materials are added, with the coating materials preventing attack of the molten iron on the hearth layer. The coating materials may include compounds of carbon, iron oxide, silicon oxide, magnesium oxide, and / or aluminum oxide. The coating materials may be placed as a solid or a slurry on the hearth layer and heated, which provides a protective layer onto which the iron oxide ores and carbon materials are placed. The iron oxide is reduced and forms molten globules of high purity iron and residual carbon, which remain separate from the hearth layer. An improved apparatus includes a cooling plate that is placed in close proximity with the refractory or vitreous hearth layer, cooling the molten globules to form iron metal buttons that are removed from the hearth layer. The improvements due to the present apparatus and method of operation provide high purity iron and carbon solid buttons, which are separate from slag particulates, and discharged without significant loss of iron product to the interior surfaces of the furnace.

The invention provides a detecting method for air flow distribution of a blast furnace. The heat exchange between an air flow and a solid material bed is considered; the distribution of a material layer structure in the radial direction of the blast furnace influences the air permeability of the blast furnace in the radial direction so as to influence the form of the air flow distribution; and the material layer structure in the radial direction of the blast furnace and the air flow distribution are calculated by combining a cross-shaped temperature measuring gun and other main operation parameters of the blast furnace. According to the detecting method provided by the invention, a blast furnace operator can timely and accurately speculate the material layer structure in the radial direction of the furnace throat part and the change direction of the air flow distribution according to the variation of the radial air flow temperature distribution at present, so that the direction is provided for the adjustment of the distribution system, the stable and smooth operation of the blast furnace is guaranteed, the service life is prolonged, the fuel ratio is reduced, and other expensive detecting instruments are not needed.

A carbonaceous refractory material is produced by adding an organic binder to a mixture containing a carbonaceous material comprising a carbonaceous raw material comprising calcined anthracite, calcined coke, artificial graphite or natural graphite or a mixture thereof at 50 to 85% as the principal raw material, alumina particle at 5 to 15%, metal silicon particle at 5 to 15%, and one or two or more of titanium carbide powder, titanium nitride powder and titanium carbonitride powder at 5 to 20% in total, kneading and molding the resulting mixture and baking the molded article under non-oxidizing atmosphere. By using the carbonaceous refractory material as the inner lining material for the side wall and bottom of blast furnace hearth, the consumption of the inner lining material due to the dissolution thereof in melted pig iron can be decreased, and simultaneously, the abrasion due to the flow of melted pig iron can be decreased, which works to prolong the life of the blast furnace.