Method for removing acid gases in flue gas using red mud as absorbing agent

A technology of acidic gas and absorbent, applied in separation methods, chemical instruments and methods, separation of dispersed particles, etc., can solve problems such as increased power consumption, system outage, large pressure drop, etc., to improve utilization rate, operation and maintenance amount The effect of small size and simple system setting

Active Publication Date: 2009-08-12
BEIJING BOOTES ELECTRIC POWER SCI & TECH
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

The absorption towers used in the two patents are all packed towers. Although the gas-liquid contact area of ​​the packed tower is large, the power consumption is increased due to the large pressure drop during operation, and due to the nature of the red mud itself, the use of packing The tower will cause fouling, clogging and other problems, and even stop the system in severe cases

Method used

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  • Method for removing acid gases in flue gas using red mud as absorbing agent
  • Method for removing acid gases in flue gas using red mud as absorbing agent
  • Method for removing acid gases in flue gas using red mud as absorbing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Adjust the liquid solid content of the red mud slurry entering the absorption tower to 13%. The form of the absorption tower is a spray tower. In the spray tower, under the action of the circulation pump, the absorption slurry is sprayed in a mist form out, fully countercurrent contact with the flue gas entering from the middle of the tower to absorb the SO 2 , Control the pH value of the absorption slurry to 6.0. The desulfurized flue gas is discharged into the chimney after the fine liquid droplets are removed by the demister, and the by-product red mud after desulfurization is pumped out of the absorption system. The flue gas volume at the entrance of the absorption tower is 790980Nm 3 / h, SO 2 The content is 4387mg / Nm 3 , the export content is 573mg / Nm 3 , desulfurization efficiency 86.9%, desulfurization system inlet SO 2 The flow rate is 3.47t / h, and the red mud consumption is 362.9t / h.

Embodiment 2

[0042] Adjust the liquid-solid content of the red mud slurry entering the absorption tower to 25%. The form of the absorption tower is a spray tower. out, fully countercurrent contact with the flue gas entering from the middle of the tower to absorb the SO 2 , control the pH value of the absorption slurry to 7.0. The desulfurized flue gas is discharged into the chimney after the fine liquid droplets are removed by the demister, and the by-product red mud after desulfurization is pumped out of the absorption system. The flue gas volume at the entrance of the absorption tower is 823861Nm 3 / h, SO 2 The content is 4622mg / Nm 3 , the export content is 413mg / Nm 3 , the desulfurization efficiency is 91.1%, and the inlet SO of the desulfurization system 2 The flow rate is 3.81t / h, and the red mud consumption is 310.2t / h.

Embodiment 3

[0044] Adjust the liquid solid content of the red mud slurry entering the absorption tower to 18%. The form of the absorption tower is a bubble tower. In the bubble tower, under the action of a booster fan, the flue gas enters the red mud slurry from the injection pipe to form a bubble layer. , in the bubbling layer, the red mud slurry is in full countercurrent contact with the flue gas to absorb the SO 2 , Control the pH value of the absorption slurry to 5.5. The desulfurized flue gas is discharged into the chimney after the fine liquid droplets are removed by the demister, and the by-product red mud after desulfurization is pumped out of the absorption system. The flue gas volume at the entrance of the absorption tower is 803421Nm 3 / h,SO 2 The content is 5120mg / Nm 3 , the export content is 389mg / Nm 3 , the desulfurization efficiency is 92.4%, and the inlet SO of the desulfurization system 2 The flow rate is 4.11t / h, and the red mud consumption is 510.2t / h.

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Abstract

The invention discloses a method for removing acidic gas in flue gas by taking red mud as an absorbent, comprising the following steps: 1) red mud serous fluid is prepared by mixing red mud discharged from an alumina plant with water to be taken as the absorbent; 2) washing is carried out on the flue gas by sufficient contact of the red mud fluid and the flue gas in an absorption tower, and the acidic gas contained in the flue gas is absorbed; 3) the purified red mud serous fluid which absorbs the acidic gas is discharged into a red mud yard; 4) the purified clean gas is discharged into atmosphere.

Description

technical field [0001] The invention relates to a method for removing acid gas (especially sulfur-containing gas) in flue gas (waste gas) by using red mud discharged during alumina production as an absorbent. Background technique [0002] Red mud is the residue produced by leaching alumina from bauxite with strong alkali. For every ton of alumina produced, about 1 to 2 tons of red mud appear. It is estimated that about 60 million tons of red mud are produced by the aluminum industry in the world every year. At present, most alumina plants around the world accumulate or pour red mud into the deep sea. The storage of red mud not only occupies a large amount of land and farmland, but also consumes more yard construction and maintenance costs, and the residual alkali in the red mud can penetrate underground, causing groundwater pollution. Due to the unique physical and chemical properties of red mud, its chemical and phase composition is complex, which has always been the foc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50B01D53/38B01D53/80
Inventor 刘鹏程吴树志张明李永旺樊运甫顾利锋武东战
Owner BEIJING BOOTES ELECTRIC POWER SCI & TECH
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