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A method for reducing emission of flue gas pollutants in iron ore sintering process

A technology for sintering process and pollutants, applied in separation methods, chemical instruments and methods, and separation of dispersed particles, etc., can solve problems such as low efficiency of nitrogen oxide emission reduction, reduction of nitrogen oxide emissions, etc.

Active Publication Date: 2021-08-20
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • 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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  • A method for reducing emission of flue gas pollutants in iron ore sintering process
  • A method for reducing emission of flue gas pollutants in iron ore sintering process
  • A method for reducing emission of flue gas pollutants in iron ore sintering process

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Embodiment 1

[0041] like 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 powd...

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 emission of flue gas pollutants in an iron ore sintering process, and relates to the technical field of emission reduction of sintering pollutants. In the present invention, firstly, quicklime is added to the fuel for dry mixing without adding water to obtain a modified fuel, and then the modified fuel is mixed with iron-containing raw materials and a flux to obtain a mixture, and the mixture is packed into Lay it on the trolley, ignite the mixture, and sinter it with ventilation; then the sintering flue gas pipeline is equipped with an electrostatic precipitator and a desulfurization tower. The present invention can effectively reduce the emission of NOx by mixing the modified fuel into the sintering mixture; in addition, it can effectively reduce the emission of fine particles in the sintering flue gas by means of electric dust removal; and is equipped with a desulfurization tower to realize the SO 2 Effective emission reduction, and then realize the joint emission reduction of various pollutants in the sintering process.

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 Patents(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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