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Large gas amount stray metallurgical off-gas wet dust collection and desulfuration method

A technology for smelting flue gas and wet dust removal, applied in the fields of smelting and chemical industry, can solve the problems of high equipment investment and operation cost, complicated process and poor economy, and achieve low processing cost, shortened process and environmental benefits. significant effect

Pending Publication Date: 2017-09-22
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has obvious effect, but the process is complicated, the equipment investment and operation cost are too high, the economy is not good, and it also produces a large amount of acid wastewater, and the treatment cost is high

Method used

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  • Large gas amount stray metallurgical off-gas wet dust collection and desulfuration method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Preparation of magnesium hydroxide slurry: First, add the purchased qualified magnesium oxide powder and fresh water into the magnesium oxide aging tank 19 in a certain proportion, pass steam, start stirring, and aging for 2 hours to make 12% magnesium hydroxide slurry, which is oxidized The magnesium slaking pump 18 is delivered to the magnesium hydroxide slurry tank 17 for use. During normal production, the side stirring device 8 is turned on, the oxidation aeration device is turned on, and air is blown in by the air spray gun 7 . Turn on the absorption tower circulation pump 12 to deliver the magnesium hydroxide slurry to the multi-layer spray device 5, adjust the spray layer control valve 9, and open the three layers for spraying. Smelting stray flue gas (gas volume about 600,000 Nm 3 / h, SO 2 The concentration is 1057-3500mg / Nm 3 , the average is about 3000mg / Nm 3 , temperature 50±10°C) after being pressurized by the flue gas conveying fan 2, it enters the towe...

Embodiment 2

[0022] During abnormal production, the amount of smelting stray flue gas is about 400,000 Nm 3 / h, SO 2 The concentration is 6000-8500mg / Nm 3 , the average is about 7000mg / Nm 3 , temperature 200-280°C. The side stirring device 8 is turned on, the oxidation aeration device is turned on, and air is blown in by the air spray gun 7 . Turn on the magnesium hydroxide slurry pump 16, deliver the magnesium hydroxide slurry to the magnesium hydroxide slurry spray device 24 at the flue gas inlet to spray the flue gas to cool down, turn on the absorption tower circulation pump 12 to deliver the magnesium hydroxide slurry to the spray layer 5, adjust Each layer of spray layer control valve 9 is opened to spray on the second floor. After the smelting stray flue gas is pressurized by the flue gas conveying fan 2, after being cooled and washed by the magnesium hydroxide slurry spraying device 24, it enters the tower body from the middle and lower part of the desulfurization absorption to...

Embodiment 3

[0024] During abnormal production, the amount of smelting stray flue gas is about 400,000 Nm 3 / h,SO 2 The concentration is 835-2500mg / Nm 3 , the average is about 2000mg / Nm 3 , temperature 50±10°C. The side stirring device 8 is turned on, the oxidation aeration device is turned on, and air is blown in by the air spray gun 7 . Turn on the absorption tower circulation pump 12 to deliver the magnesium hydroxide slurry to the spray layer 5, adjust the single-layer spray layer control valve 9, and open the second layer for spraying. After being pressurized by the flue gas conveying fan 2, the stray flue gas from smelting enters the tower body from the middle and lower part of the desulfurization absorption tower 1, diffuses evenly through the flow-balancing efficiency tray 6, and mixes with the top-down air from the multi-layer spraying device 5. Magnesium hydroxide slurry reverse contact, magnesium hydroxide slurry will SO in the flue gas 2 absorb. After desulfurization, the...

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Abstract

The invention discloses a large gas amount stray metallurgical off-gas wet dust collection and desulfuration method. According to the large gas amount stray metallurgical off-gas wet dust collection and desulfuration method, magnesium oxide is used for main adsorption, and sodium hydroxide is used for auxiliary adsorption, and the adding amount of sodium hydroxide is adjusted in time based on off-gas SO2 concentration; an adsorption-dedusting-demisting-evacuation integrated structure is adopted by an adsorption tower; a high temperature off-gas cooling device is arranged at a desulphurization adsorption tower inlet; a lateral stirring device and an aeration oxidation device are arranged at the bottom of the desulphurization adsorption tower; so that sparingly soluble magnesium sulfite in the adsorption tower can be converted into easily soluble magnesium sulfate effectively, and deposition of insoluble matters such as off-gas and magnesium oxide impurities is avoided; press filtration is adopted for treatment of a desulphurization liquid, so that separation of insoluble substances with magnesium sulfate solution is realized. Treatment effect is obvious, treatment cost is low, and requirements of treatment of complex metallurgical off-gas at high temperature period in large gas amount at high concentration SO2 are satisfied.

Description

technical field [0001] The invention belongs to the fields of smelting and chemical industry, and relates to a method for wet dust removal and desulfurization of large-volume stray smelting flue gas, which integrates "absorption-dust removal-mist removal-evacuation" and achieves standard treatment at all times. Background technique [0002] During the smelting process, a large amount of SO containing 2 The low-concentration smelting stray gas mainly includes the fume collected in the workshop, maintenance and heat preservation flue gas, incoming and outgoing flue gas, low-concentration high-temperature smelting flue gas, etc. during the production process of each kiln. It is characterized by large gas volume and low concentration of SO 2 There are mainly high-concentration periods, and low-temperature periods are mainly high-temperature periods (normal flue gas temperature is about 40-55°C, and in special cases as high as 280°C), and the flue gas is accompanied by a large n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/50B01D50/00C01F5/40
CPCB01D50/00B01D53/502B01D53/504B01D53/80C01F5/40B01D2251/402B01D2251/604B01D2258/0283
Inventor 马旻锐路八智瞿尚君魏占鸿饶栋高德成刘陈李燕梅段淑斌张学欢
Owner JINCHUAN GROUP LIMITED
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