Reduction furnace with inner heating containers for producing direct induction iron

Abstract

The invention discloses a reduction furnace with inner heating containers for producing direct induction iron. The reduction furnace structurally comprises a furnace body, and is characterized in that a fire-resistant insulating heat-insulation layer (6) is arranged on the outer wall of the furnace body, the inner heating containers (3) are arranged in the fire-resistant insulating heat-insulation layer (6) and connected with conductive devices (7), a feed inlet (5) is arranged on the top of the furnace body, and a discharge outlet (1) is arranged at the bottom of the furnace body. After being mixed with balance carbon (used as a reducing agent), solid optional-grade iron ores in optional shapes can be directly reduced into sponge iron by the reduction furnace. The reduction furnace has the advantages that limitation on the grades of the iron ores and the quality and the varieties of coal are cast off, materials used by the reduction furnace are abundant, the reduction furnace is simple in structure, reliable in technique and excellent in environmental performance, the production cost is greatly lowered, and particularly, an additional value is increased in a production process.

Description

technical field [0001] The invention relates to a heating liner reduction furnace for direct reduced iron production, which belongs to the technical field of direct reduced iron processing. Background technique [0002] my country's iron and steel industry has developed rapidly and has become the world's largest steel producer and steel consumer. In 2011, the steel output exceeded 700 million tons, and the annual demand for scrap steel was more than 90 million tons, and the demand for reduced iron was 5 million tons (of which imported reduced iron was more than 4 million tons), but the output of direct reduced iron in my country is less than half a month in India. As a result, steel companies have a large shortage of direct reduced iron, and have to spend a large amount of foreign direct reduced iron at a high price. Therefore, my country is not a strong country in steel, and steel products are not competitive in the international market. In terms of steel varieties and qual...

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Problems solved by technology

[0005] The downdraft kiln developed earlier in my country, and its characteristics are: less investment, quick start-up, low cost, flexible scale, simple operation, low requirements for raw materials, but its product quality is poor and unstable, low production efficiency, high energy consumption, High labor intensity, poor operating environment, serious environmental pollution, backward equipment level, fully manual operation, no mechanization at all, but because of the low investment and some small enterprises are using it, the country does not advocate the use

[0006] Process characteristics of rotary kiln: high degree of mechanization, high operating environment, light pollution, but there are also high product costs, large investment, prone to loop failure, low product quality, and low filling factor (generally 10%- 20%), high product differentiation rate

Strict requirements on raw materials and reducing agents, low production efficiency, low thermal efficiency and other shortcomings, several domestic companies have used it, but none of them have been very successful

[0007] The traditional tunnel kiln process must use expensive refractory tanks, which is backward in technology and high in energy consumption (500-650 kg of coal for reduction and 450-550 kg of coal for heating are consumed per ton of direct reduced iron), and the reduction time is long ( 48-76h), high labor consumption, unstable product quality, high production and operation costs, and poor sales. This process also has serious environmental pollution (reduced coal ash, waste reduction tanks and other solid waste and dust), and the Disadvantages such as high raw material requirements (TFe≥66%)

[0008] All the above-mentioned direct reduction iron technologies at home and abroad cannot use low-grade ore, powder and iron-containing waste to directly reduce high-grade reduced iron products

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