Smelting separation furnace reduction system and method based on natural gas-oxygen heating

Abstract

The invention relates to a smelting separation furnace reduction system and method based on natural gas-oxygen heating. The system comprises a reduction shaft furnace, a smelting separation furnace and a natural gas-oxygen gun, wherein the reduction shaft furnace comprises a mineral powder-flux feeding port, a dropping port and a flue gas inlet; inclination-adjustable baffle plates are arranged in the hearth of the reduction shaft furnace; the smelting separation furnace comprises a feeding port, a flue gas outlet and a discharging port; the feeding port communicates with the dropping port of the reduction shaft furnace; the flue gas outlet communicates with the flue gas inlet of the reduction shaft furnace; a spray gun head of the natural gas-oxygen gun is arranged in the smelting separation furnace; and the natural gas-oxygen gun extends into the smelting separation furnace from the furnace top of the smelting separation furnace. According to the system and the method provide by the invention, the mineral powder dropping speed and residence time can be controlled through arrangement of the inclination-adjustable baffle plates in the reduction shaft furnace, thereby guaranteeing the mineral powder reduction effect.

Description

technical field [0001] The present invention generally relates to a melting furnace reduction system and method, in particular to a melting furnace reduction system and method heated by natural gas and oxygen. Background technique [0002] Non-blast furnace ironmaking is a direction of steel development, the main purpose is to achieve low-cost smelting and utilization of refractory ore, and also to achieve clean production. In recent years, coal-based smelting reduction and direct reduction + electric furnace melting technology and coal-based direct reduction + gas furnace melting technology have gradually developed into one of the ironmaking process technologies. This process has the advantages of using coal instead of coke, high reduction temperature, and smelting time Short, low energy consumption, low environmental pollution and low investment, etc., are in line with the development status of resources and energy in my country, and have become one of the hot research topi...

AI Technical Summary

Problems solved by technology

[0005] The disadvantages of the second prior art are: the fluidized bed needs four stages of reduction, and the structure is complex; before entering the melting furnace, it is necessary to form hot-pressed balls from briquettes and then enter the melting furnace

In addition, harmful impurities such as S in a large amount of natural gas enter molten iron, which affects the quality of iron

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