A Short Process Blast Furnace Ironmaking Process

Abstract

The short-flow blast furnace ironmaking experimental scheme of the present invention is characterized in that it utilizes the original blast furnace smelting principle and retains the original blast furnace air supply system, hot air system, pulverized coal injection system, furnace body cooling system, and furnace top gas purification Treatment and oxygen enrichment system, and heighten the furnace body, add mineral powder drying, mineral powder conveying and mineral powder injection systems and hearth oxygen blowing system, so that the mineral powder can be "rotary injection" at the top of the furnace, and The "sprayed" mineral powder can form a "naturally descending" and "suspended" "spiral-shaped powder column" in the high-temperature reducing gas in the furnace under the "action of gravity", and make the "spiral-shaped powder column" "Pillar" completes indirect reduction and direct reduction in the process of "natural descent", allowing the blast furnace to produce molten iron under the conditions of direct use of ore powder, coal powder, flux powder and proper oxygen blowing; after the success of the experimental program and its promotion, It will be very beneficial to the in-depth development of ironmaking technology, and will be able to generate huge economic and social benefits.

Description

technical field [0001] The invention relates to the field of blast furnace ironmaking, and is a novel ironmaking method that allows the blast furnace to directly use ore powder, coal powder, and flux powder and blow oxygen properly under the premise of retaining the original basic system of the blast furnace. Background technique [0002] In today's world, in the field of iron and steel smelting, especially in the field of ironmaking, more than 90% of the pig iron (mainly referring to molten iron) is still provided by the traditional blast furnace ironmaking system; because the traditional blast furnace ironmaking requires pretreatment of raw materials and fuel, Therefore, it is necessary to increase sintering, pelletizing, coking and other production links with high energy consumption and serious environmental pollution. Although people know that the above links have high energy consumption and serious environmental pollution problems, due to the traditional blast furnace T...

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Problems solved by technology

[0002] In today's world, in the field of iron and steel smelting, especially in the field of ironmaking, more than 90% of the pig iron (mainly referring to molten iron) is still provided by the traditional blast furnace ironmaking system; because the traditional blast furnace ironmaking requires pretreatment of raw materials and fuel, Therefore, it is necessary to increase sintering, pelletizing, coking and other production links with high energy consumption and serious environmental pollution. Although people know that the above links have high energy consumption and serious environmental pollution problems, due to the traditional blast furnace The system has the advantages of mature technology, perfect process, relatively low production cost, strong production capacity, and can meet the needs of internal processes in large-scale iron and steel complexes, and these advantages cannot be replaced by "non-blast furnace" processes in a short period of time. replaced, so had to continue to use blast furnaces for ironmaking

[0003] Although all countries in the world are researching and developing "non-blast furnace ironmaking technology" and "direct reduction ironmaking technology" that can reduce environmental pollution, so far, although the above technologies have made certain progress and have a certain production capacity, However, there are still certain immaturities and technical imperfections, and there are still problems that the production cost is still higher than that of traditional blast furnaces, and its production capacity cannot meet the needs of the internal production links of large iron and steel complexes.

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