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Iron making method and device by virtue of gas-based smelting reduction

A gas-based, gas-based technology, applied in the direction of reducing gas emissions, can solve the problems of difficult raw material sources, difficult reduction process, and high requirements for reduction equipment, and achieve the effects of improving equipment utilization, low cost, and saving investment

Active Publication Date: 2012-07-11
BERIS ENG & RES CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the existing gas-based reduction requirements for high-grade pellets or lump ore, and the difficulty in raw material sources and the difficulty of the reduction process caused by the production of high-reduction pre-reduced ore (direct reduced iron). For problems such as high equipment requirements, provide a gas-based-smelting reduction ironmaking method and device, which can use existing shaft furnaces and submerged arc furnaces, with low equipment requirements and cost savings; and in the ironmaking process, process parameters are easy to be strict Control, the reduction degree of pre-reduced ore is controlled within the range of 83-88%

Method used

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  • Iron making method and device by virtue of gas-based smelting reduction
  • Iron making method and device by virtue of gas-based smelting reduction
  • Iron making method and device by virtue of gas-based smelting reduction

Examples

Experimental program
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Effect test

Embodiment 1

[0057] The raw material used in this embodiment is pellets, and its chemical composition is as shown in Table 1

[0058] Table 1: pellet chemical composition: (the unit of numerical value in the table is weight percent)

[0059] TF

FeO

S

P

SiO 2

63.00

0.10

0.006

0.023

7.21

[0060] TFe represents the total iron content, that is, the total amount of iron in the ore.

[0061] The reducing gas used in this example is the by-product gas produced by semi-coke, and its chemical composition is shown in Table 2.

[0062] Table 2 (the units of the values ​​in the table are volume percentages)

[0063] name

H 2

CO

CO 2

CH 4

C n h m

h 2 o

content

47.12

34.84

2.1

11.18

1.65

3.1

[0064] Gas calorific value is about: 15900KJ / Nm 3

[0065] Process conditions for gas-based shaft furnace reduction:

[0066] Ore gas ratio (p...

Embodiment 2

[0072] The raw materials used in this embodiment are the same as in Example 1, and the specific process is as follows.

[0073] The above-mentioned by-product gas (reducing gas) is passed into the inner side of the tubes in the tube-and-tube heat exchanger 3, and the high-calorie tail gas produced by the reduction tail gas of the combustion shaft furnace is passed into the outer side of the tubes, and the high-calorie tail gas exchanges heat with the by-product gas , the reducing gas is heated to 800°C-850°C. Then, the reducing gas is passed into the burner 4, and oxygen is injected from the combustion nozzle, and the oxygen partially burns the reducing gas, and supplementarily increases the temperature of the reducing gas to 950-970°C. The feed rate of oxygen is 3%-4% (volume ratio) of the reducing gas.

[0074] Preheat the pellets to 650°C-700°C. Then, the above-mentioned pellets and reducing gas are mixed according to the ore gas ratio (pellets (kg): coal gas (Nm 3 )) = ...

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Abstract

The invention provides an iron making method and device by virtue of gas-based smelting reduction. The method comprises the following steps of: step 1, preparing raw materials: preparing pellet or lump ores as the raw material; step 2, carrying out pre-reduction: carrying out pre-reduction on the pellet or lump ores and a reducing gas in a vertical furnace (1) to obtain pre-reduced ores, wherein the weight / volume ratio of pellet or lump ores to reducing gas is 1kg: (0.7-0.9Nm<3>), preferably, 1kg: 0.8Nm<3>, the pressure of the reducing gas at the gas inlet of the vertical furnace is 0.6MPa-0.65MPa, and the temperature of the reducing gas at the gas inlet of the vertical furnace is 930 DEG C-970 DEG C; and step 3, carrying out final reduction: carrying out final reduction on the pre-reduced ore obtained by pre-reduction in the vertical furnace in an ore heat furnace (2) with semicoke or coke powder. According to the invention, the existing vertical furnace and the ore heat furnace can be adopted; and in the iron making process, process parameters are easy to strictly control, the reducing degree of the pre-reduced ore is controlled to 83-88%, thus the technical difficulty of a gas-based reduction process is reduced, and the utilization rate of the reducing gas for gas-based reduction is improved.

Description

technical field [0001] The invention relates to the technical field of ironmaking production technology, in particular to a gas-based-smelting reduction ironmaking method and device, which are suitable for smelting pellets or lump ores with an iron content as low as 62%. Background technique [0002] The cokeless ironmaking method is a process method of iron and steel metallurgy, and the gas-based (including natural gas, coke oven gas (including by-product gas of semi-coke production), coal-to-gas) shaft furnace reduction is an important one. [0003] Usually the gas-based shaft furnace direct reduction product (direct reduced iron) is used as the direct raw material for electric furnace steelmaking or as an additive for converter steelmaking to replace scrap steel. Therefore, this type of process requires that the iron content of pellets or lump ore as a raw material is greater than 66%, so as to reduce the amount of slag discharge in electric furnace steelmaking or convert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/14
CPCY02P10/143
Inventor 吴铁生赵铭刘志宏邬生荣师磊
Owner BERIS ENG & RES CORP
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