An experimental device and method for strengthening sintering

An experimental device, a technology for strengthening sintering, applied in furnaces, furnace types, rotary drum furnaces, etc., can solve the problems of low gas recovery rate, large consumption, heavy losses, etc., and achieve uniform mineralization, reduced consumption, and low transformation costs. Effect

Active Publication Date: 2020-05-01
NORTHEASTERN UNIV LIAONING
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  • Description
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AI Technical Summary

Problems solved by technology

Up to now, the sensible heat recovery rate of products is 50.4%, the sensible heat recovery rate of flue gas is 14.92%, and the waste heat recovery rate of iron and steel industry is 25.8%. The average gas recovery rate of most enterprises is low, the consumption is large and the emission is serious. CO concentration and calorific value are both high, but the emission rate is also high. The value brought by its physical heat and chemical latent heat is greatly lost every year. It is necessary to comprehensively utilize the exhausted furnace gas as a resource.

Method used

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  • An experimental device and method for strengthening sintering
  • An experimental device and method for strengthening sintering
  • An experimental device and method for strengthening sintering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] An experimental device for strengthening sintering ignition and oxygen-enriched sintering, such as figure 1 and figure 2 As shown, it includes a converter 1, a cylinder-type negative pressure flue gas recovery hood 2, a vaporization cooling flue 3, a high-temperature cyclone separator 4, a flue gas component detector 5, a sintering cup 6, and a liquefied natural gas storage tank 8. The components of the converter 1 The upper part of the opening is movable with a cylinder-type negative pressure flue gas recovery hood 2, which can be moved away from the top of the opening of the converter 1, and the upper end of the cylinder-type negative pressure flue gas recovery hood 2 is connected to vaporization One end of the cooling flue 3 and the other end of the vaporization cooling flue 3 are connected to the air inlet at the lower side of the high-temperature cyclone separator 4, and the gas outlet at the upper end of the high-temperature cyclone separator 4 is connected to th...

Embodiment 2

[0061] 1. Recover the high temperature (1400°C) at the front and rear ends of the converter to release the flue gas (component CO 30%, CO 2 20%, N 2 50%), the dust will be reduced to 5g / Nm by high temperature cyclone dust removal 3 the following;

[0062] 2. Add natural gas and high-temperature flue gas to ignite with an air volume of 40L / min, and the ignition time is 80s. When the ignition temperature reaches 1150°C, stop feeding natural gas;

[0063] 3. Switch to the flue gas hot air (300°C) after the waste heat recovery, and keep spraying and keeping warm on the upper part of the material layer until the sintering is completed;

[0064] 4. The vertical sintering speed is 39.6mm / min. The sintered ore is tested by dropping and drumming. The drum index (<5mm) of the upper layer of sintered ore is 34.9%, and the drum index (<5mm) of the lower layer of sintered ore is 23.6%. The finished product rate of ore is 51.1%, and the finished product rate of sintered ore in the lowe...

Embodiment 3

[0066] 1. Recover the high temperature (1450°C) at the front and rear ends of the converter to release the flue gas (component CO 30%, CO 2 20%, N 2 50%), the dust will be reduced to 5g / Nm by high temperature cyclone dust removal 3 the following;

[0067] 2. Add natural gas with high-temperature flue gas to ignite with an air volume of 45L / min, and the ignition time is 70s. When the ignition temperature reaches 1180°C, stop feeding natural gas;

[0068] 3. Switch to the flue gas hot air (280°C) after the waste heat recovery, and keep spraying and keeping warm on the upper part of the material layer until the sintering is completed;

[0069] 4. The vertical sintering speed is 41.3mm / min. The sintered ore is tested by dropping and drumming. The drum index (<5mm) of the upper layer of sintered ore is 32.5%, and the drum index (<5mm) of the lower layer of sintered ore is 22.1%. The finished product rate of ore is 53.5%, and the finished product rate of sintered ore in the low...

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Abstract

The invention relates to an experimental device for enhanced sintering. The experimental device comprises a converter, a barrel-hood-type negative-pressure flue gas recovery cover, a vaporization cooling flue, a high-temperature cyclone separator, a flue gas component detector, a sintering cup and a liquefied natural gas storage tank, the barrel-hood-type negative-pressure flue gas recovery coveris movably arranged on the upper part of the converter, the upper part of the barrel-hood-type negative-pressure flue gas recovery cover communicates with one end of the vaporization cooling flue, theother end of the vaporization cooling flue communicates with a gas inlet formed in the lower end of the side face of the high-temperature cyclone separator, a gas outlet in the upper end of the high-temperature cyclone separator is connected with the flue gas component detector, a gas outlet of the flue gas component detector communicates with a center igniting spraying opening of the sintering cup, and the liquefied natural gas storage tank communicates with the center igniting spraying opening of the sintering cup through a pipeline. According to the experimental device, flue gas generatedby the converter is effectively utilized, and the flue gas utilization rate is increased; the combustion efficiency and the sintering speed are effectively promoted, the transformation cost is low, safety is high, and the occupied space is small; and forming of obtained sintered ores is uniform, excellent in performance, high in strength and good in reducibility.

Description

technical field [0001] The invention relates to an experimental device and method for strengthening sintering, belonging to the technical field of iron and steel metallurgy and ironmaking production. Background technique [0002] The sintering method is a method in which fine ore and concentrate are heated at high temperature and sintered into ore under the condition of incomplete melting. Sintered ore is a porous aggregate composed of various mineral tissues. The vast majority of iron-containing materials must be sintered before they can be smelted, which is an important production process for iron and steel metallurgy and ironmaking. [0003] In sintering production, the automatic heat storage of the material layer leads to excess heat and high temperature in the lower part, insufficient heat in the upper part, and lower temperature, resulting in the rapid cooling of the upper part by cold air at the same time, resulting in a large number of glassy crystals, resulting in g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/216
Inventor 薛向欣宋翰林张金鹏杨合程功金黄壮
Owner NORTHEASTERN UNIV LIAONING
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