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A method and device for producing direct reduced iron

A direct iron ore technology, applied in furnaces, furnace types, shaft furnaces, etc., can solve the problems of high production energy consumption, low emissions, easy furnace ring formation, etc., and achieve high utilization value, enhanced activity, and improved air permeability Effect

Active Publication Date: 2020-03-17
ZHONGYE-CHANGTIAN INT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to provide a direct reduction iron production method and device to solve the problems of other direct reduction processes such as heavy dependence on natural gas resources, high requirements on coal powder quality, easy ring formation in the furnace, high production energy consumption and relatively large pollution. problems, to achieve rapid production of high-quality direct reduced iron at lower temperatures, with low energy consumption and low emissions

Method used

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  • A method and device for producing direct reduced iron
  • A method and device for producing direct reduced iron
  • A method and device for producing direct reduced iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0113] The preheated pellets are mixed with coal powder to carry out direct reduction in the microwave shaft furnace. The preheated pellets are TFe66.32%, and the compressive strength is 850N. The coal powder is added according to the ratio of 1:1. In the furnace, after preheating, microwave heating, reducing roasting, and cooling, the metallization rate and carbon residue were measured. Among them, the reduction temperature is 1050°C, and the reduction time is 68 minutes. The metallization rate of the obtained direct reduced iron product is 94.26%, and the carbon residue is 0.17%. 2 3.5%.

Embodiment 2

[0115] Use oxidized pellets to add coal powder to the microwave shaft furnace for direct reduction, in which the oxidized pellets have TFe64.24%, compressive strength 2973N, add coal powder according to the ratio of 1:1, mix them and send them into the microwave shaft furnace , After preheating, microwave heating, reducing roasting, and cooling, the metallization rate and carbon residue were measured. Among them, the reduction temperature is 1050°C, the reduction time is 65 minutes, the metallization rate of the obtained direct reduced iron product is 95.25%, and the carbon residue is 0.12%. In addition, the CO in the exhaust gas collected from the air duct during the reduction process accounts for 96.5%, and the CO 2 Accounted for 2.7%.

Embodiment 3

[0117] Pre-reduced pellets are mixed with coal powder to carry out direct reduction in a microwave shaft furnace. The pre-reduced pellets have a TFe77.17% and a compressive strength of 1060N. Coal powder is added according to the carbon excess coefficient of 2.0, and then sent into the microwave shaft furnace after mixing. In the furnace, after preheating, microwave heating, reducing roasting, and cooling, the metallization rate and carbon residue were measured. Among them, the reduction temperature is 950°C, and the reduction time is 56 minutes. The metallization rate of the obtained direct reduced iron product is 95.47%, and the carbon residue is 0.11%. 2 Accounted for 1.8%.

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Abstract

The invention relates to a microwave shaft furnace direct reduction process adopting pellets and coal powder. According to the process, direct reduced iron is produced from raw material pellets and external matched material coal powder in a continuous microwave shaft furnace, selection heating, rapid heating, volume heating, activated metallurgical chemical reaction and other features of the microwave are fully utilized, gasification of fixed carbon is accelerated, and iron oxide is further reduced, so that the reduction temperature is lowered and the reaction time is shortened. The coal powder can serve as both a reducing agent and a heating element in the process, a gas-solid-heat exchange step is simplified, energy is saved and emission is reduced. The process contains low free oxygen content, and can produce CO with high purity of 95% or above; and the process is compact in structure, high in metallization degree, which is 94-98%, low in carbon content, which is less than 0.2%, andis low in quality requirements on coal powder, thereby being an environment-friendly iron making process.

Description

technical field [0001] The invention belongs to the technical field of ironmaking, relates to a microwave shaft furnace direct reduction process using pellets and coal powder, and is a combination of direct reduction technology, microwave heating technology, equipment technology and other disciplines. Background technique [0002] Due to the long production process of traditional blast furnace ironmaking, large investment, high energy consumption, serious pollution, and the depletion of coking coal resources, it is of great strategic significance to develop a new ironmaking process that replaces coke with coal, saves energy and reduces emissions, and is efficient and compact. As the most important method of non-blast furnace ironmaking, the shaft furnace direct reduction process accounts for 75% of the total direct reduced iron (DRI) output. Not only the reactor equipment is mature, the process is simple, the investment cost is small, safe and reliable, but also the energy co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21B13/02
CPCC21B13/02Y02P10/20
Inventor 胡兵王兆才
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD
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