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Method for centrally removing PM2.5 and heavy/alkali metal in iron ore sintering flue gas

A technology for sintering flue gas and alkali metals, which is applied in the treatment of iron ore sintering flue gas, and concentrated removal of PM2.5 and heavy/alkali metals in iron ore sintering flue gas, which can solve the problem of large flow rate of sintering flue gas and low emission concentration , The process adsorption technology cannot adapt to the sintering demand and other problems, to achieve the effect of prolonging the service life, stable and efficient removal

Active Publication Date: 2018-07-06
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the disadvantages of introducing new impurities into the mixture or being difficult to implement in the sinter layer due to the addition of solid and gas adsorbents, the process adsorption technology cannot meet the needs of sintering; due to the large flow of sintering flue gas (about 3000-4300m from 1t sinter 3 Exhaust gas), PM 2.5 The emission concentration is low, and it is difficult to obtain efficient and low-cost application of agglomeration pretreatment technology

Method used

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  • Method for centrally removing PM2.5 and heavy/alkali metal in iron ore sintering flue gas
  • Method for centrally removing PM2.5 and heavy/alkali metal in iron ore sintering flue gas
  • Method for centrally removing PM2.5 and heavy/alkali metal in iron ore sintering flue gas

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Experimental program
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Effect test

Embodiment 1

[0033] According to the temperature of flue gas in different bellows, H 2 O(g) content (see figure 1 ) and PM 2.5 , heavy / alkali metal emission concentrations (see figure 2 ), the sintering flue gas is divided into three sections: the first section of the sintering stage is 1 # -13 # Bellows; 14 in the middle of the sintering stage # -20 # Bellows; sintering stage tail section is 21 # -twenty four # bellows. Flue gas temperature at different stages, H 2 O(g) content and PM 2.5The proportion of heavy / alkali metal emissions to total emissions is shown in Table 1. The flue gas discharged from the front and end of sintering is introduced into the low-emission flue, and the conventional electrostatic precipitator is used for dust removal. The flue gas discharged from the middle part of the sintering is introduced into the high-emission flue, and filtered by a ceramic filter membrane, and the purification efficiency is as high as 95.5%. Then, the purified high-emission ...

Embodiment 2

[0035] According to the temperature of flue gas in different bellows, H 2 O(g) content (see figure 1 ) and PM 2.5 , heavy / alkali metal emission concentrations (see figure 2 ), the sintering flue gas is divided into three sections: the first section of sintering is 1 # -14 # Bellows; 15 mid-sinter section # -20 # Bellows; burn end section is 21 # -twenty four # bellows. Flue gas temperature at different stages, H 2 O(g) content and PM 2.5 The proportion of heavy / alkali metal emissions to total emissions is shown in Table 1. The flue gas discharged from the front and end of sintering is introduced into the low-emission flue, and the conventional electrostatic precipitator is used for dust removal. The flue gas discharged from the middle section of sintering is introduced into the high-emission flue, and filtered by a metal fiber membrane, and the purification efficiency is as high as 96.8%. Then, the purified high-emission flue gas is recovered by the waste heat rec...

Embodiment 3

[0037] According to the temperature of flue gas in different bellows, H 2 O(g) content (see figure 1 ) and PM 2.5 , heavy / alkali metal emission concentrations (see figure 2 ), the sintering flue gas is divided into three sections: the first section of sintering is 1 # -14 # Bellows; 15 mid-sinter section # -twenty one # Bellows; burn end is 22 # -twenty four # bellows. Flue gas temperature at different stages, H 2 O(g) content and PM 2.5 The proportion of heavy / alkali metal emissions to total emissions is shown in Table 1. The flue gas discharged from the front and end of sintering is introduced into the low-emission flue, and the conventional electrostatic precipitator is used for dust removal. The flue gas emitted from the middle section of sintering is introduced into the high-emission flue, and filtered by the intermetallic compound membrane, and the purification efficiency is as high as 98.5%. Then, the purified high-emission flue gas is recovered by the wast...

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Abstract

The invention discloses a method for centrally removing PM2.5 and heavy / alkali metals in an iron ore sintering flue gas. The method comprises the following steps: dividing a sintering flue gas into three parts, namely a former-stage flue gas with a high PM2.5 and heavy / alkali metal discharge ratio, a low temperature and a high H2O(g) content, a medium-stage flue gas with a high PM2.5 and heavy / alkali metal discharge ratio, a high temperature and a low H2O(g) content, and a tail-stage flue gas with a low PM2.5 and heavy / alkali metal discharge ratio, a high temperature and a low H2O(g) content;introducing the former-stage flue gas and the tail-stage flue gas into a low-discharge flue, and removing dust by using a common static dust collector; and introducing the medium-stage flue gas into ahigh-discharge flue, and directly removing PM2.5 and heavy / alkali metals by using a high-temperature resistant filtering membrane. By adopting the method, efficient and central treatment on PM2.5 andheavy / alkali metals is achieved through sectional regulation and control of flue gases, and waste heat of a high-grade flue gas can be beneficial for being recycled.

Description

technical field [0001] The invention relates to a method for treating iron ore sintering flue gas, in particular to a concentrated removal of PM from iron ore sintering flue gas 2.5 and heavy / alkali metal method; belongs to the technical field of iron and steel metallurgy flue gas treatment. Background technique [0002] Iron ore sintering is the first high-temperature process in the entire iron and steel smelting process. While consuming a lot of materials and energy, the amount of exhaust gas also accounts for more than 40% of the total iron and steel industry. It is the main source of air pollution in the iron and steel industry. In addition to COx, NOx, SOx and other gas pollutants, the sintering flue gas also contains PM. 2.5 Ultrafine particle pollutants and heavy / alkali metals account for 40% to 50% of the total emissions from the steel industry. Therefore, the sintering process PM can be effectively controlled 2.5 The emission of heavy / alkali metals is of great si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D46/54B03C3/017
Inventor 甘敏范晓慧季志云田野姜涛陈许玲李光辉袁礼顺吕薇汪国靖周阳孙亚飞王英坡赵新泽王燕南黄柱成杨永斌郭宇峰朱忠平李骞张元波
Owner CENT SOUTH UNIV
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