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A corex smelting reduction method for adjusting the components of the reduced gas by blending coal

A technology for gas composition and coal blending, which is applied in the field of coal pyrolysis gas production and smelting reduction ironmaking process preparation, can solve the problems of large coke consumption and low metallization rate, and achieves reduction of coke consumption and improvement of reduction metallization rate. , Improve the effect of active ingredients

Active Publication Date: 2018-10-02
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of large coke consumption and low metallization rate in smelting reduction technology, the present invention provides a COREX smelting reduction ironmaking method that adjusts the composition of reducing gas by blending coal, and produces high-quality reducing gas through the lump coal blending method. Increase the CO and H2 gas content in the reducing gas, thereby increasing the effective components in the reducing gas, thereby increasing the reduction metallization rate of the shaft furnace, producing qualified molten iron, and achieving the purpose of reducing the proportion of COREX coke usage

Method used

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  • A corex smelting reduction method for adjusting the components of the reduced gas by blending coal
  • A corex smelting reduction method for adjusting the components of the reduced gas by blending coal

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Experimental program
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Effect test

Embodiment 1

[0045] Three kinds of lump coal A, B, C with particle size between 5-50mm, assuming that the weight part of blending lump coal is 100, the weight part of lump coal A (Ad=5, Vd=42) is 38, and lump coal B (Ad=5, Vd=26) is 18 parts by weight, and the weight part of lump coal C (Ad=3, Vd=24) is 44. It is 1050 DEG C melting furnace top temperature is 1050 DEG C to add the lump coal that will mix in proportion. In the gasification furnace, the reduced gas (1000°C) produced after pyrolysis is mixed with cold gas, adjusted to 800°C, and then enters the hot cyclone dust collector. The ore, coke, and flux added to the top of the furnace undergo a reverse reduction reaction. The reduction pressure of the gasifier is between 0.3MPa and the pure oxygen flow through the gasifier is 550NM3 / tHM. The reduced gas components, ore metals entering the shaft furnace The conversion rate and coke ratio and other indicators are shown in Table 1.

Embodiment 2

[0047] Three kinds of lump coal A, B, C with granularity between 5-55mm, assuming that the weight part of matching lump coal is 100, the weight part of lump coal A (Ad=4, Vd=39) is 40, and lump coal B (Ad=6, Vd=28) is 20 parts by weight, and the weight part of lump coal C (Ad=2, Vd=25) is 40. It is 1050 ℃ of molten In the gasification furnace, the reduced gas (1050°C) produced after pyrolysis is mixed with cold gas, adjusted to 830°C, and then enters the hot cyclone dust collector. After dust removal, the reduced gas enters the reduction shaft furnace and flows from the reduction shaft The ore, coke, and flux added to the top of the furnace undergo a reverse reduction reaction. The reduction pressure of the gasifier is between 0.33MPa and the pure oxygen flow through the gasifier is 535NM3 / tHM. The reduced gas components and ore metals entering the shaft furnace The conversion rate and coke ratio and other indicators are shown in Table 1.

Embodiment 3

[0049]Three kinds of lump coal A, B, C with granularity between 5-60mm, assuming that the weight portion of blending lump coal is 100, the weight portion of lump coal A (Ad=4, Vd=37) is 42, and lump coal B The parts by weight of (Ad=5, Vd=30) are 21, and the parts by weight of lump coal C (Ad=2, Vd=26) are 37. Adding the lump coals in proportion to the melting furnace top temperature is 1050°C. In the gasification furnace, the reduced gas (1100°C) produced after pyrolysis is mixed with cold gas, adjusted to 850°C, and then enters the hot cyclone dust collector. After dust removal, the reduced gas enters the reduction shaft furnace and flows from the reduction shaft The ore, coke, and flux added to the top of the furnace undergo a reverse reduction reaction. The reduction pressure of the gasifier is between 0.35MPa and the pure oxygen flow through the gasifier is 520NM3 / tHM. The reduced gas components, ore metals entering the shaft furnace The conversion rate and coke ratio and...

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Abstract

The invention discloses a COREX method for reducing coal gas components through coal gas blending adjustment. The COREX method comprises the following steps: step I, coal blending, wherein the types of several kinds of lump coal are gas coal (Ad=4-5, Vd=37-42), steam coal 1 (Ad=5-6, Vd=26-30) and steam coal 2 (Ad=2-3, Vd=24-26); the particle size of the three kinds of coal is 0-60 mm; the supplying amount of the gas coal takes up 38-42% of the weight of the whole matching coal; the supplying amount of the steam coal 1 takes up 18-21% of the weight of the whole matching lump coal; the supplying amount of the steam coal 2 takes up 37-44% of the weight of the whole matching lump coal. According to the COREX method, through the cooperation of different lump coal, the effective components in reduced coal gas are increased, the reduction metallization ratio of ore is increased, the coke consumption during the COREX reduction process is reduced, and the production cost is reduced.

Description

technical field [0001] The invention relates to the field of coal pyrolysis gas production and smelting reduction ironmaking process preparation, in particular to a COREX smelting reduction method for adjusting the components of reduced gas through coal blending. Background technique [0002] Due to increasingly stringent environmental protection requirements, smelting reduction ironmaking technology has attracted widespread attention because it does not require two processes of coking and sintering. The smelting reduction ironmaking process is the only new industrialized smelting reduction ironmaking process at present. It can directly use lump coal, and generate a large amount of reducing gas through high-temperature pyrolysis of lump coal in a melting gasifier to reduce minerals to obtain molten iron products. The smelting reduction ironmaking process currently in production in my country is the largest in the world. In the process of smelting, the melter gasifier requir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/14
Inventor 王玉明毛晓明胡德生钱晖徐万仁
Owner BAOSHAN IRON & STEEL CO LTD
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