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Emission reduction method for sintering flue gas PM2.5 based on adsorption by reinforced material layer

A technology of sintering flue gas and material layer, which is applied in the field of reducing sintering flue gas PM2.5 emission reduction and sintering flue gas PM2.5 emission reduction. It can solve the problems of low removal efficiency, achieve enhanced adsorption and reduce emissions , the effect of changing the wettability

Active Publication Date: 2018-07-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For existing sinter dust removal equipment for PM 2.5 Remove the problem of low efficiency, the object of the present invention is to provide a kind of by PM 2.5 Adsorbed in the sintered material layer, at the same time, PM in the flue gas in the heating section 2.5 Centralized treatment to reduce sintering flue gas PM 2.5 The emission method does not change the existing process and does not affect the output of sinter, which is conducive to the wide application in industrial production

Method used

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  • Emission reduction method for sintering flue gas PM2.5 based on adsorption by reinforced material layer
  • Emission reduction method for sintering flue gas PM2.5 based on adsorption by reinforced material layer
  • Emission reduction method for sintering flue gas PM2.5 based on adsorption by reinforced material layer

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Embodiment 1

[0037] After batching iron ore, limestone, dolomite, returned ore, quicklime and other sintering raw materials, they are mixed in the first cylinder mixer, and then granulated in the second cylinder mixer; mixed in the second cylinder Add slaked lime, which accounts for 1.5% of the total mass of sintered raw materials, 90% of the digestion degree, 80% of -0.5mm particle size, and 5% of free water content, at the tail of the machine 5m away from the discharge end; Spray 0.4% sodium carboxymethyl cellulose solution at the end 3.5m of the total mass of raw materials for sintering, and the mass concentration of sodium carboxymethyl cellulose in the solution is 0.5%; transport the granulated mixture to the sintering The material bin at the head of the machine is then placed on the sintering machine trolley covered with primer, and finally ignited and sintered. The sintering flue gas is divided into the flue gas in the heating section and the flue gas in the non-heating section for ...

Embodiment 2

[0039] After batching iron ore, limestone, dolomite, returned ore, quicklime and other sintering raw materials, they are mixed in the first cylinder mixer, and then granulated in the second cylinder mixer; mixed in the second cylinder Add slaked lime which accounts for 0.5% of the total mass of sintered raw materials, 95% of the digestion degree, 85% of -0.5mm particle size, and 3% of free water content at the tail of the machine at a distance of 4.5m from the discharge end; discharge at the tail of the second cylinder mixer The polyacrylamide solution accounting for 0.2% of the total mass of the sintering raw materials is sprayed at 3m from the material end, and the mass concentration of polyacrylamide in the solution is 0.8%; the granulated mixture is transported to the silo at the head of the sintering machine by a belt , and then spread it on the sintering machine trolley covered with primer, and finally ignite and sinter. The sintering flue gas is divided into the flue ga...

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Abstract

The invention discloses an emission reduction method for sintering flue gas PM2.5 based on adsorption by a reinforced material layer. The method comprises the following steps: slaked lime is added into an iron ore sintering raw material in a pellet preparation process at a position 4.5-5m away from a discharging end of a second cylinder drum type mixer tail part, an adsorbent solution is sprayed at a position 3-3.5m away from the discharging end, in order to obtain pellets whose surfaces are adhered by calcium hydroxide and the adsorbent, and the adsorbent and slaked lime are used for absorbing and bonding PM2.5 and discharging of PM2.5 in the sintering process is reduced. A semi-dry process or a dry method desulphurization-bag dedusting technology is used for cleaning flue gas at a sintering and heating segment after cyclone dust removal, flue gas at a non-heating segment is cleaned by electric precipitation, so that concentration of PM2.5 in the discharged flue gas is reduced to 20mg / Nm<3> or below, strict discharge standard requirements are satisfied, original sintering flows are not changed, large-scale purifying equipment are not additionally installed, and high efficient economic treatment of sintering flue gas PM2.5 is realized.

Description

technical field [0001] The invention relates to a method for reducing sintering flue gas PM 2.5 A method of emission reduction, especially related to a method of realizing sintering flue gas PM by strengthening material layer adsorption 2.5 The emission reduction method belongs to the technical field of iron and steel metallurgy. Background technique [0002] PM 2.5 Refers to atmospheric particles with an aerodynamic diameter less than or equal to 2.5 μm, which can enter the alveoli of the human body, so they are also called lung-entering particles. A large number of studies have shown that fine particulate matter is far more harmful to human health than coarse particulate matter. PM 2.5 The particle size is small, the specific surface area is large, the activity is strong, and it is easy to carry toxic and harmful substances, and the residence time in the atmosphere is long, and the transportation distance is long, which has a great impact on the quality of the atmosphe...

Claims

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Application Information

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IPC IPC(8): B01D49/00
CPCB01D49/00
Inventor 季志云范晓慧甘敏陈许玲姜涛李光辉袁礼顺吕薇汪国靖周阳曹风赵元杰赵一雄肖恒黄柱成杨永斌郭宇峰朱忠平李骞张元波许斌
Owner CENT SOUTH UNIV
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