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Iron ore sintering flue gas PM10 and PM2.5 emission reduction method

A technology for sintering flue gas and PM10, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of large flue gas flow, complex composition, limited emission reduction effect, etc.

Active Publication Date: 2016-07-06
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] (5) The composition of the flue gas is complex, which contains a variety of pollutants, such as: fine particulate matter, SO 2 , COx, NOx, HCl, HF and dioxins, etc.
Such as: the name of the invention: industrial kiln flue gas PM 2.5 Dust and heavy metal treatment and removal device [9] , (Chinese patent number: ZL201220721358.X, application date: 2012-12-24), by setting a filter bag on the flue gas passage, and placing the bag cage inside the filter bag, the PM 2.5 Dust emission reduction; this technology has a good emission reduction effect on large particle pollutants, but the PM in the flue gas 2.5 The emission reduction effect is limited
In addition, the name of the invention is: a method for segmental circulation of iron ore sintering flue gas [10] (Chinese patent number: ZL201310443223.0, application date: 2013-09-26), a method for energy saving and emission reduction of iron ore sintering [11] (Chinese patent number: ZL201510137762.0, application date: 2015-03-27), etc., these technical solutions can realize the coordinated emission reduction of various pollutants in the sintering flue gas, although it can reduce the emission of large particles of dust in the flue gas ; but the emission reduction effect on fine particulate matter in sintering flue gas is extremely limited
In addition, compared with other exhaust gases, sintering flue gas has complex composition and huge flue gas flow rate, so that effective emission reduction technologies suitable for fine particulate matter in sintering flue gas have not yet been developed.

Method used

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  • Iron ore sintering flue gas PM10 and PM2.5 emission reduction method
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  • Iron ore sintering flue gas PM10 and PM2.5 emission reduction method

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Embodiment 1

[0058] combine Figure 10 and Figure 11 As shown, the emission reduction method of a kind of iron ore sintering flue gas PM10 and PM2.5 in the present embodiment: in the process of iron ore sintering, the agglomeration liquid is sprayed into the flue gas channel of the sintering flue gas, and the fine particles in the sintering flue gas Agglomerates and grows under the action of the agglomeration liquid, and adopts the dust removal device 4 to remove the fine particles that agglomerate and grow.

[0059] The composite agglomerating agent for emission reduction of fine particles of flue gas consists of the following components: 10 g of polyaluminum chloride, 30 g of sodium carboxymethyl cellulose, 30 g of polyacrylamide, and 2 g of additives. The additive is a solid additive, and the additive is composed of activated carbon and coke powder. The additive is composed of the following mass percentages: 90% activated carbon and 10% coke powder. 100μm, coke powder particle size r...

Embodiment 2

[0108] The basic content of this embodiment is the same as that of Example 1, except that the additive is composed of activated carbon and zeolite, and the additive is composed of the following mass percentages: 85% of activated carbon and 15% of zeolite, and the particle size of the activated carbon requires: 74μm≤activated carbon particle size≤100μm, zeolite particle size requirement: 74μm≤zeolite particle size≤100μm.

[0109] Detect the emission concentration of PM2.5 and PM10 in the sintering flue gas after the dust removal device 4, and calculate the emission reduction efficiency of PM2.5 and PM10. The emission reduction efficiency of PM2.5 is 56.4%, and the emission reduction efficiency of PM10 is 49.0%.

Embodiment 3

[0111] The basic content of this embodiment is the same as that of Example 1, except that the additive is composed of activated carbon and zeolite, and the additive is composed of the following mass percentages: 95% of activated carbon and 5% of zeolite.

[0112] Detect the emission concentration of PM2.5 and PM10 in the sintering flue gas after the dust removal device 4, and calculate the emission reduction efficiency of PM2.5 and PM10. The emission reduction efficiency of PM2.5 is 60.2%, and the emission reduction efficiency of PM10 is 48.8%.

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Abstract

The invention discloses an iron ore sintering flue gas PM10 and PM2.5 emission reduction method, belonging to the technical field of reduction of emission of pollutants in an iron ore sintering process. According to the method, in an iron ore sintering process, an agglomeration solution is sprayed in a sintering flue gas channel, and fine particulate matter in sintering flue gas is agglomerated and grows up under the action of the agglomeration solution, and then is removed by a dedusting device; the agglomeration agent comprises polymeric aluminium chloride, sodium carboxymethylcellulose, polyacrylamide and a solid additive. According to the iron ore sintering flue gas PM10 and PM2.5 emission reduction method, the droplets of the agglomeration solution adsorbing fine particulate matter are nucleated and collided and grow up under low pressure to form large particle agglomerates, the agglomerated and grown fine particulate matter is removed by the dedusting device, and high-efficiency emission reduction of the fine particulate matter is realized. Therefore, the method can provide a brand-new means for reduction of emission of fine particulate matter in an iron ore sintering process.

Description

technical field [0001] The invention relates to the technical field of pollutant emission reduction in the iron ore sintering process, and more specifically, relates to a method for reducing emission of PM10 and PM2.5 in iron ore sintering flue gas. Background technique [0002] Inhalable particulate matter refers to the general term for particulate matter that can enter the human respiratory tract through the nose and mouth, represented by PM10 (particles with an aerodynamic diameter of less than 10 microns in the ambient air). PM2.5 refers to particulate matter in the ambient air with an aerodynamic equivalent diameter less than or equal to 2.5 microns. It can be suspended in the air for a long time, and the higher its concentration in the air, the more serious the air pollution. Although PM2.5 is only a small component of the earth's atmospheric composition, it has an important impact on air quality and visibility. Compared with coarser atmospheric particles, PM2.5 has ...

Claims

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Application Information

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IPC IPC(8): B01D47/06B01D50/00B01D53/79B01D53/60
CPCB01D47/06B01D50/00B01D53/10B01D53/60B01D53/79B01D2258/0283B01D2247/02B01D2253/102B01D50/60
Inventor 春铁军吴雪健龙红明王欢李家新狄瞻霞王平孟庆民宁超钱立新
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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