Smelting reduction ironmaking furnace and ironmaking technology thereof

Abstract

The invention provides a smelting reduction ironmaking furnace which comprises an upright furnace body (1), flues (2) arranged on the upper part of the furnace body (1), a water-cooled wall (3) arranged on the inner wall of the furnace body (1), upper layer spraying guns (4) and lower layer spraying guns (5) which are arranged in the furnace body (1), a fireproof lining (6) arranged in the furnace body (1), a scrap iron channel (9) arranged at the bottom of the furnace body (1), an upper slag discharging opening (7) and a lower slag discharging opening (8) which are formed in the scrap iron channel (9), a slag barrier wall (10) arranged in the scrap iron channel (9), and an iron outlet (11) formed in the tail of the scrap iron channel (9). The invention also provides an ironmaking technology for the smelting reduction ironmaking furnace. According to the smelting reduction ironmaking furnace and the ironmaking technology of the smelting reduction ironmaking furnace, smelting reduction ironmaking production can be continuously performed, the ironmaking speed is high, the consumption of crude fuels is low, and the production cost is low.

Description

technical field [0001] The invention relates to the technical field of ironmaking, in particular to a smelting reduction ironmaking furnace and an ironmaking process thereof. Background technique [0002] With the continuous expansion of the blast furnace volume, the modern blast furnace ironmaking process has higher and higher requirements for raw materials and fuels, which has caused the traditional ironmaking process to face problems related to resources, environmental protection, and economy, and has caused continuous increase in production costs. Since the smelting reduction ironmaking process does not use coke, iron ore powder does not need to be sintered and pelletized, it has the characteristics of efficient resource utilization, low environmental pollution, and high production efficiency. [0003] The smelting reduction ironmaking process uses a high-temperature environment to melt ore powder, reduce iron oxide with carbon, and at the same time use the secondary com...

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Problems solved by technology

The DIOS process in Japan, the HIsmelt process in Australia, the AISI process in the United States, the Romelt process in the former Soviet Union, etc., because the secondary combustion is carried out on the surface of the molten pool, the utilization efficiency of combustion heat is low, resulting in high energy consumption in the process; HIsmelt in Australia The continuous slag discharge of the smelting reduction process, a part of the iron ore that undergoes melting and reduction reactions is discharged before the reaction is complete, resulting in a FeO content of about 5.0% in the discharged slag, and entraining about 5.0% of granular iron, resulting in the entire The iron loss of the process is too high, which seriously wastes resources; when the DIOS process in Japan adopts the "intermittent" production method, the slag can be fully reduced through the furnace operation, and the iron oxide in the slag can be reduced to about 3.0%. It also caused excessive energy consumption, resulting in high cost of molten iron; the Romelt process of the former Soviet Union adopted the method of adding raw fuel on one side of the top and "siphoning" slag discharge on the other side of the bottom. Sufficient time for reduction, the iron oxide content can be reduced to less than 2.5%, and the resources are better recovered. However, due to the use of staves for enhanced cooling in this process, not only the heat loss is too large, the production cost of molten iron is too high, and the production There are major safety hazards in

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