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A method of agglomeration to suppress the emission of fine particles in the iron ore sintering process

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

Active Publication Date: 2018-12-04
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
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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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  • A method of agglomeration to suppress the emission of fine particles in the iron ore sintering process
  • A method of agglomeration to suppress the emission of fine particles in the iron ore sintering process
  • A method of agglomeration to suppress the emission of fine particles in the iron ore sintering process

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Embodiment 1

[0066] combine Figure 10 and Figure 11 As shown, the present embodiment sinters a kind of agglomeration method to suppress the emission of fine particles in the iron ore sintering process: the specific emission reduction steps are:

[0067] Step 1: Prepare the reunion solution

[0068] (A) Weigh 10 g of polyaluminum chloride, 30 g of sodium carboxymethyl cellulose, and 30 g of polyacrylamide in parts by mass, and mix 10 g of solid particle polyaluminum chloride, 30 g of sodium carboxymethyl cellulose, and 30 g of polyacrylamide , to get mixture A;

[0069] (B) Take 2g of the additive by mass parts, the additive is a solid additive, add in the mixture A, mix uniformly, and obtain the composite agglomerating agent;

[0070] (C) Mix the composite agglomerating agent in step (B) with water, stir and mix evenly, and the mass ratio of agglomerating agent to water is 1:5000, and then add Ca(OH) 2 The pH of the powder-adjusted solution is 8.5, and the agglomeration liquid is pre...

Embodiment 2

[0116] 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.

[0117] 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

[0119] 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.

[0120] 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 agglomeration method for suppressing the emission of fine particles in the iron ore sintering process, and belongs to the technical field of pollutant emission reduction in the iron ore sintering process. The steps of the present invention are as follows: step 1: preparing the agglomeration liquid, mixing components such as sodium carboxymethyl cellulose, polyacrylamide and additives uniformly to prepare an agglomerating agent, and mixing the agglomerating agent with water to prepare an agglomerating liquid; step two : The fine particles are agglomerated, the agglomeration liquid is sprayed into the flue gas, and the fine particles in the sintering flue gas are agglomerated and grow up under the action of the agglomeration liquid; Step 3: The dust removal device captures, and the dust removal device captures and removes the agglomerated fine particles . The present invention enables the agglomerated liquid mist adsorbed with fine particles to nucleate, collide, and grow up under low pressure to form large particle agglomerates, and uses a dust removal device to remove the agglomerated and grown fine particles, which is a fine particle for the iron ore sintering process. The reduction of particulate matter provides a new way to reduce emissions.

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 suppressing the discharge of fine particulate matter in the iron ore sintering process by agglomeration. 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 coar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D51/02
CPCB01D51/02
Inventor 春铁军吴雪健龙红明李家新狄瞻霞王平孟庆民宁超钱立新王欢
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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