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Method for conducting sintering and spraying and adding of combustible gas

A gas and sintering mixture technology, applied in the field of iron and steel metallurgy, can solve the problems of not taking into account the influence of the permeability of the sintered material layer, the test device cannot be used by the sintering trolley, reducing the effect of improving the quality of the sintered ore, and eliminating the need for heat supply. Insufficient, improve the injection effect, eliminate the effect of insufficient carbon distribution

Active Publication Date: 2016-12-07
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The shortcomings of this patent are: (1) Coke oven gas was not sprayed in time after ignition, which greatly reduced the effect of coke oven gas assisted sintering on the quality of sinter
It is inappropriate for this patent to take the consumption of coke oven gas per ton of sintered ore as the control point, and it does not take into account the influence of factors such as the air permeability of the sintered material layer, the capacity of the fan, and the conditions of sintered raw materials and fuels.
(3) The patent does not consider how to spray coke oven gas evenly and safely
The disadvantage of this patent is that this patent is only aimed at the test device for spraying gas-assisted sintering on the sintering cup in the laboratory, and the test device cannot be used on the moving sintering trolley

Method used

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  • Method for conducting sintering and spraying and adding of combustible gas
  • Method for conducting sintering and spraying and adding of combustible gas
  • Method for conducting sintering and spraying and adding of combustible gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Flammable gas ignition and explosion test results

[0029] The fire and explosion test results for low-concentration flammable gas (see Table 1) show that no fire or explosion occurs when the flammable gas concentration ranges from 0.4% to 2%.

[0030] Table 1 flammable gas ignition and explosion test results

[0031]

Embodiment 2

[0033] A method for sintering and spraying combustible gas, said method comprising the following steps:

[0034] (1) From the end of sintering ignition, spray flammable gas above the surface of the sintering mixture, the sprayed flammable gas area is sealed and isolated from the surrounding area, and is divided into multiple sub-areas in the transverse direction and traveling direction of the sintering trolley, and each The sub-areas are isolated from each other; above the sintering mixture surface is a stable downward air flow field, and the sprayed flammable gas mixes with the air above the sintering mixture surface to form a low-concentration flammable gas with a volume concentration of 1.77%. Gas; the spraying time is 8 minutes (that is, it ends at 33% of the length of the sintering machine), and at the same time, the amount of carbon is reduced according to 60% of the total calorific value of the sprayed combustible gas;

[0035] (2) Low-concentration flammable gas is suc...

Embodiment 3

[0041] A method for sintering and spraying combustible gas, said method comprising the following steps:

[0042] (1) From the end of sintering ignition, spray flammable gas above the surface of the sintering mixture, the sprayed flammable gas area is sealed and isolated from the surrounding area, and is divided into multiple sub-areas in the transverse direction and traveling direction of the sintering trolley, and each The sub-areas are isolated from each other; above the sintering mixture surface is a stable downward air flow field, and the sprayed combustible gas is mixed with the air above the sintering mixture surface to form a low-concentration flammable gas with a volume concentration of 0.42%. Gas; the spraying time is 4 minutes (that is, it ends at 16.5% of the length of the sintering machine), and at the same time, the amount of carbon is reduced by 20% of the total calorific value of the flammable gas sprayed;

[0043] (2) Low-concentration flammable gas is sucked int...

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Abstract

The invention discloses a method for conducting sintering and spraying and adding of combustible gas. The carbon addition in a sintering mixture is reduced, meanwhile, the combustible gas is sprayed and added to the position above the face of the sintering mixture, the combustible gas is mixed with air above the face of the sintering mixture, and the low-concentration combustible gas is formed. Under the action of air draft, the low-concentration combustible gas is sucked into the sintering mixture and participates in the sintering reaction in a sintering material layer, oxidization heat releasing is conducted, heat is supplemented into the material layer, the staying time of sintering feed in a high-temperature area is prolonged, and sintering crude fuel can be better subjected to the sufficient chemical reaction. Meanwhile, the situation that the heat on the upper layer is not enough and the heat on the lower layer is surplus is improved, the sinter yield and the drum strength are improved, solid burnup of sinter is reduced, and emission of carbon dioxide, sulfur dioxide and nitric oxide is reduced.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a method for spraying flammable gas into sintering. Background technique [0002] At present, iron and steel enterprises generally face pressure from two aspects. On the one hand, iron and steel enterprises have long-term losses, and the pressure to reduce production costs is huge; on the other hand, as the country pays more and more attention to environmental protection, the pressure on iron and steel enterprises in terms of energy conservation and emission reduction is also gradually increasing. [0003] As an important link in the iron and steel process, the sintering process improves the quality of sinter ore and reduces the fuel consumption of sintered solids, which not only helps to reduce the cost of ironmaking, but also reduces the emission of carbon dioxide and sulfur dioxide. In recent years, through experiments and studies by sintering pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16
CPCC22B1/16
Inventor 武轶李小静周江虹金俊刘自民张晓萍王军刘益勇
Owner MAANSHAN IRON & STEEL CO LTD