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Comprehensive treatment process for deep dust removal, desulfurization and denitrification of flue gas from glass kiln

A desulfurization and denitrification and comprehensive treatment technology, applied in the field of flue gas purification, can solve the problems of sodium salt steam easily poisoning SCR catalyst, bag filter material is easy to block, dust removal and desulfurization and denitrification efficiency are not high, so as to achieve easy dust removal and improve ventilation sex, performance-improving effect

Active Publication Date: 2017-12-01
SHANGHAI JIAOTONG UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to provide a glass furnace flue gas deep dust removal and desulfurization and denitrification in order to overcome the defects of the above-mentioned prior art that the bag filter material is easy to block, the sodium salt vapor is easy to poison the SCR catalyst, and the efficiency of dust removal and desulfurization and denitrification is not high. comprehensive approach

Method used

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  • Comprehensive treatment process for deep dust removal, desulfurization and denitrification of flue gas from glass kiln

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as figure 1 As shown, taking the actual flue gas produced by a certain glass furnace as the treatment object, the flue gas L101 produced after passing through the glass furnace contains SO 2 , NO x , dust, sodium and other semi-volatile vapors, the gas flow rate is 40000m 3 / h. where SO 2 Concentration at 700mg / m 3 left and right, NO x The concentration is about 2000mg / m 3 , the particle concentration is 400mg / m 3 . The raw flue gas L101 is passed into the bag filter 1 through the dust removal flue, and the magnesium oxide powder is injected into the dust removal flue in front of the bag filter 1 by the circulating injection system 2 (the particle size range 200 mesh or so) mixed with dust, the dust comes from the dust collected by the dust collection bin 3 of the bag filter 1, and the amount of magnesium oxide powder used accounts for 10% of the total circulating ash. The concentration of circulating ash injected by system 2 in the flue gas is 500mg / m 3 ...

Embodiment 2

[0033] The actual flue gas produced by a certain glass kiln is treated as the treatment object, among which SO 2 Concentration at 1000mg / m 3 Around, NOx concentration is about 2000mg / m 3 , the particle concentration is 8000mg / m 3 . Use the dry circulation injection system to inject magnesium oxide powder into the bag filter, in which the amount of magnesium oxide accounts for 2% of the total circulating ash. After a period of stability, the dust is collected for pulping and enters the wet Desulfurization tower, blowing a certain concentration of ozone (about 2000mg / m3) into the desulfurization tower 3 ), after the reaction is stable, sample and analyze the flue gas at the outlet of the bag filter and analyze each working condition. The results showed that the addition of magnesium oxide improved the easy removal performance of the filter cake of the bag filter, the SCR catalyst operated normally and was protected from poisoning, SO 2 The removal rate of NOx has reached mo...

Embodiment 3

[0035] The actual flue gas produced by a certain glass kiln is treated as the treatment object, among which SO 2 Concentration at 1000mg / m 3 effect, the NOx concentration is about 2000mg / m 3 , the particle concentration is 8000mg / m 3 . Use the dry circulation injection system to inject magnesium oxide powder into the bag filter to increase the proportion of magnesium oxide powder used. Among them, the amount of magnesium oxide accounts for 20% of the total circulating ash. After a period of stability, collect the dust for dust removal Pulp and enter the wet desulfurization tower, using the combined process of ozone-hydrogen peroxide for desulfurization and denitrification, in which the concentration of ozone is about 2000mg / m 3 , the proportion of hydrogen peroxide accounts for about 1% of the total desulfurization liquid. After the reaction is stable, sample and analyze the flue gas at the outlet of the bag filter and analyze each working condition. The results show that...

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Abstract

The invention discloses a comprehensive treatment process for deep dust removal, desulfurization and denitrification of flue gas from a glass kiln. The invention relates to the field of glass furnace flue gas treatment. The raw material flue gas is discharged into the dust removal flue, where magnesium-containing powder and part of the collected dust are injected to mix it with the raw material flue gas to obtain a mixed flue gas; the resulting mixed flue gas is passed into the bag filter for Filtration to obtain low-dust flue gas and dust; the dust is divided into two parts, and magnesium-containing powder is added to one part, which is reinjected into the dust removal flue with an air jet device, and mixed with the raw material flue gas; the other part is added water to make desulfurization slurry; the obtained low-dust flue gas is passed into a low-temperature SCR denitrification device for denitrification to obtain low-nitrogen and low-dust flue gas; the low-nitrogen and low-dust flue gas is passed into a wet desulfurization device, and the desulfurization The slurry is desulfurized, and the tail gas is discharged into the atmosphere. Compared with the prior art, the present invention has good dust removal effect, can improve the efficiency of denitrification, realizes recycling of wastes, and realizes the purpose of deep emission reduction of flue gas pollutants.

Description

technical field [0001] The invention relates to the field of flue gas purification, in particular to a comprehensive treatment process for deep dust removal, desulfurization and denitrification of glass kiln flue gas. Background technique [0002] The flue gas produced by the glass kiln is one of the key industrial pollutants controlled in our country. At present, most glass furnaces mainly use coal gas as the fuel for high-temperature furnaces, and the concentration of particulate matter in the flue gas produced by them is about 8000mg / m 3 , NO x Concentration is 2000mg / m3, SO2 is about 800~1000mg / m3 3 . The current conventional dedusting and desulfurization and denitrification process is to first use the bag filter to remove the particulate matter, and then enter the low-temperature SCR section for NO x removal, and finally into the wet desulfurization equipment to remove SO 2 . However, because the glass furnace contains semi-volatile substances such as sodium salt ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D46/02B01D53/75B01D53/86B01D53/78B01D53/60B01D53/68
Inventor 晏乃强瞿赞徐浩淼赵松建黄文君梅剑全福权
Owner SHANGHAI JIAOTONG UNIV
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