Method for reducing discharge of flue gas pollutants in iron ore sintering process

A sintering process and pollutant technology, applied in separation methods, chemical instruments and methods, electrostatic effect separation, etc., can solve the problems of reducing nitrogen oxide emissions, low nitrogen oxide emission reduction efficiency, etc. Effective reduction and effective emission reduction

Active Publication Date: 2019-01-04
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to provide a method for reducing the emission of flue gas pollutants in the iron ore sintering process in view of the low efficiency of nitrogen oxide emission reduction in the sintering process in the prior art; Dry-mixing with a small amount of quicklime particles to prepare a modified fuel, which can effectively reduce the emission of nitrogen oxides by mixing the modified fuel into the sintering mixture; in addition, the emission of fine particles in the sintering flue gas can be effectively reduced by means of electrostatic precipitator; And set up a desulfurization tower to realize the joint emission reduction of various pollutants in the sintering process

Method used

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  • Method for reducing discharge of flue gas pollutants in iron ore sintering process
  • Method for reducing discharge of flue gas pollutants in iron ore sintering process
  • Method for reducing discharge of flue gas pollutants in iron ore sintering process

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Embodiment 1

[0041] Such as Figure 1~2 Shown, the emission reduction method of a kind of iron ore sintering process flue gas pollutant of the present invention, the steps are:

[0042] (1) Fuel modification treatment

[0043] Add quicklime to the fuel for dry mixing without adding water to prepare modified fuel; the specific steps are: under dry conditions, first add the fuel to the mixer, and then add quicklime to the fuel , dry-mix quicklime and fuel, avoid adding water during the mixing process, wherein the quality of quicklime is 0.25% of the total mass of fuel, and the proportion of quicklime with a particle size of less than 200 meshes is not less than 80%. This embodiment The fuel is coke powder; here, it is worth noting that the mixer needs to be dried if it is wet.

[0044] (2) Preparation of sintered material

[0045] The iron-containing raw materials, flux and modified fuel are mixed and granulated to obtain a mixture; the iron-containing raw materials may include iron ore p...

Embodiment 2

[0053] The basic content of this embodiment is the same as that of Example 1, except that the mass ratio of the fuel with a particle size of less than 1.0 mm to the fuel with a particle size greater than 1.0 mm in step (1) is: 1 to 1.86, the particle size of the fuel in this embodiment The composition is shown in Table 2, wherein the mass ratio of the fuel with particle size less than 1.0 mm to the fuel with particle size greater than 1.0 mm in this embodiment is 1.

[0054] Put the mixed material on the trolley, ignite the mixed material, ventilate and sinter, and detect the NO in the sintering flue gas in the main sintering flue gas pipeline X content, and recorded as shown in Table 5.

[0055] The particle size composition of the fuel of table 2 embodiment 2

[0056]

Embodiment 3

[0058] The basic content of this embodiment is the same as that of Example 1, except that the mass ratio of the fuel with a particle size of less than 1.0 mm to the fuel with a particle size greater than 1.0 mm in step (1) is: 1 to 1.86, the particle size of the fuel in this embodiment The composition is shown in Table 3, wherein the mass ratio of the fuel with a particle size of less than 1.0 mm to the fuel with a particle size greater than 1.0 mm in this embodiment is 1.5.

[0059] Put the mixed material on the trolley, ignite the mixed material, ventilate and sinter, and detect the NO in the sintering flue gas in the main sintering flue gas pipeline X content, and recorded as shown in Table 5.

[0060] The particle size composition of the fuel of table 3 embodiment 3

[0061]

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Abstract

The invention discloses a method for reducing discharge of flue gas pollutants in the iron ore sintering process, and relates to the technical field of discharge reduction of sintering pollutants. Themethod comprises the following steps: adding quick lime into fuel under the condition of not adding water and performing dry mixing to obtain modified fuel, mixing and pelletizing the modified fuel,an iron-containing raw material and a fluxing agent to obtain a mixed material, paving the mixed material on a trolley, and performing ignition and air draft sintering on the mixed material; and setting an electrostatic dust remover and a desulfurization tower on a sintering flue gas pipeline. The modified fuel is mixed in the sintering mixed material, so that the discharge quantity of NOx can bereduced effectively; in addition, sintering flue gas subparticles are subjected to effective discharge reduction by an electric dust-removing mode; and the desulfurization tower is provided, so that effective discharge reduction of SO2 in the sintering process is realized and combined discharge reduction of various pollutants in the sintering process is realized.

Description

technical field [0001] The invention relates to the technical field of emission reduction of sintering pollutants, in particular to a method for reducing emission of flue gas pollutants in the iron ore sintering process. Background technique [0002] Steel is currently the most widely used metal material by human beings, and global steel production is also on the rise. However, the environmental hazards caused by the mass production of steel cannot be ignored, especially in the sintering process, which will emit a large amount of pollutants; such as NOx, SO emitted from the sintering process 2 and air pollutants such as fine particles. [0003] At present, the situation of NOx emission in the sintering process is particularly severe. A large amount of NOx emission is an important reason for the formation of photochemical smog and acid rain, causing serious harm to the ecological environment and the health of the people. And the sintering process SO 2 The form of emission ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16C22B1/24B01D53/50B03C3/017
CPCB01D53/50B03C3/017C22B1/16C22B1/2406
Inventor 春铁军李家新龙红明穆固天朱梦飞余正伟王平孟庆民狄瞻霞魏汝飞代梦博秦立浩
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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