Process for making iron by virtue of COREX furnace

A process and shaft furnace technology, which is applied in the field of ironmaking using COREX furnaces, can solve the problems of low injection volume, small tuyere swirling area, and poor air permeability and liquid permeability of material column, so as to prevent dust pollution and reduce usage. Effect

Inactive Publication Date: 2015-09-30
BAOSHAN IRON & STEEL CO LTD
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  • Description
  • Claims
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Problems solved by technology

[0014] Due to the small swirl area of ​​the tuyere of the melter gasifier, the poor gas permeability of the material column, the difficulty...

Method used

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  • Process for making iron by virtue of COREX furnace
  • Process for making iron by virtue of COREX furnace
  • Process for making iron by virtue of COREX furnace

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Experimental program
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Embodiment

[0046] The following table shows the comparison of material consumption under different conditions under the condition of metallization rate of 60% and molten iron hourly output of 150 tons.

[0047] Table 1. COREX theoretical consumption per ton of iron

[0048]

[0049] It can be seen from Table 1 that before this technical solution is implemented, that is, the oxygen burner 203 does not inject coal, according to the material balance and heat balance calculation, it can be known that the ton iron-coke ratio is 250kg, and the fuel ratio is 966kg. But because the excess gas volume is less than 20000NM 3 / h, the factory pressure is difficult to stabilize, and the production operation is difficult (in order to ensure the stability of the factory pressure, the excess gas volume should not be less than 20,000 per hour), which is not feasible. It is necessary to increase the consumption of lump coal to increase the gas volume. Add flux to balance excess heat. Therefore, the ...

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Abstract

The invention discloses a process for making iron by virtue of a COREX furnace. The COREX furnace comprises a reduction vertical furnace, a fusion gasifying furnace and a washing tower, wherein the fusion gasifying furnace comprises a plurality of air holes and a plurality of oxygen burners, and oxygen is introduced into the fusion gasifying furnace at least through the air holes and the oxygen burners. The process comprises the following steps: (1) burning lump coals by virtue of oxygen introduced into the fusion gasifying furnace, so as to produce high-temperature coal gas; (2) collecting crushed coals obtained by sieving the lump coal, grinding and milling the crushed coals into powdered coal, and burning the powdered coal in a vault region of the fusion gasifying furnace, so as to produce high-temperature coal gas; (3) transmitting high-temperature coal gas to the reduction vertical furnace, so as to reduce iron-containing raw materials loaded into the reduction vertical furnace to be sponge iron; and (4) inputting sponge iron into the fusion gasifying furnace, and restoring sponge iron to be molten iron in the fusion gasifying furnace. By virtue of the process for making iron by virtue of the COREX furnace, the partial lump coals are replaced by virtue of powdered coal, so that the cost is saved.

Description

technical field [0001] The invention relates to the field of ironmaking technology, in particular to an ironmaking technology using a COREX furnace. Background technique [0002] In the prior art, commonly used ironmaking processes include a blast furnace ironmaking process and a COREX molten ironmaking process. Because the COREX ironmaking process has the advantages of less environmental pollution and short process, it is widely used. [0003] COREX smelting ironmaking process is a new environment-friendly ironmaking process using non-coking lump coal and partial coke as fuel and pure oxygen blasting. It is mainly composed of two parts: reduction shaft furnace and melting gasifier. Such as figure 1 As shown, the lump coal is directly added to the lower melter-gasifier 2 and burned with pure oxygen at high temperature to provide heat and generate gas. The gas produced by the melter-gasifier 2 is dedusted by the cyclone dust collector 4 and transported to the reduction shaf...

Claims

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Application Information

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IPC IPC(8): C21B13/14
Inventor 许海法徐万仁毛晓明熊林赵晓岩李肇毅
Owner BAOSHAN IRON & STEEL CO LTD
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