A Smelting Reduction Ironmaking Method Partially Substituting Pure Oxygen

Abstract

The invention discloses a smelting reduction ironmaking method which partially replaces pure oxygen. The reduced metallization rate of smelting reduction direct reduced iron is not high, and the furnace top gas cannot be fully utilized, so that the proportion of coke used is relatively high, and the smelting reduction To solve the problem of high cost, it is proposed to use the residual heat of furnace top gas to preheat saturated steam to generate supersaturated steam, and then inject supersaturated steam from the tuyere of the melting gasifier into the gasifier to replace part of pure oxygen, so that the water gas reaction can be used to regulate The reduction gas composition produced by the melting gasifier can increase the effective reduction components in the reduction gas, thereby increasing the reduction metallization rate of the shaft furnace minerals, reducing the proportion of coke used in smelting reduction production, and making full use of the waste heat of the reduction shaft furnace top gas to reduce melting Reduce production costs and reduce CO2 emissions in the smelting reduction process.

Description

technical field [0001] The invention belongs to the technical field of smelting reduction ironmaking for energy saving and consumption reduction, and in particular relates to a smelting reduction ironmaking method which partially replaces pure oxygen. Background technique [0002] The smelting reduction ironmaking process is the only new industrialized smelting reduction ironmaking process at present. It uses non-coking coal as the main fuel and only uses a small amount of coke to produce high-quality molten iron equivalent to the blast furnace, omitting the indispensable coking of the traditional blast furnace And sintering process, greatly reducing the pollution to the environment, in line with the strategy of sustainable development. [0003] Practice shows that the smelting reduction process still needs to be improved in many aspects, and there is still a lot of room for improvement in technology. Compared with the blast furnace of the same scale, the production cost of ...

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Problems solved by technology

[0004] From the perspective of production, the smelting reduction process has problems such as poor air permeability of the shaft furnace, easy bonding of the shaft furnace, a large number of damages to the tuyere, blockage of the riser pipe, backflow of gas, blockage of the surrounding pipe of the shaft furnace, and large coke usage. These problems often lead to problems such as factory shutdown, low production utilization, etc., which lead to increased production costs

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