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A kind of alumina roasting flue gas desulfurization and denitrification system and method and application

A desulfurization, denitrification and alumina technology, which is applied in the field of pollutant control, can solve the problems that waste cannot be effectively recycled, cannot be effectively simultaneously desulfurized and denitrified, and the desulfurization and denitration efficiency is low, so as to reduce ozone consumption and escape risks, overcome the The effect of difficult NO2 absorption and stable operation at low cost

Active Publication Date: 2019-06-25
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the problems existing in the existing alumina roasting flue gas treatment process, such as ineffective simultaneous desulfurization and denitrification, low desulfurization and denitrification efficiency, large ozone consumption, and inability to effectively recycle waste in the alumina roasting process, the present invention provides a Alumina roasting flue gas desulfurization and denitrification system and method and application

Method used

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  • A kind of alumina roasting flue gas desulfurization and denitrification system and method and application

Examples

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Embodiment 1

[0064] This embodiment provides an alumina roasting flue gas desulfurization and denitrification system, such as figure 1 As shown, the system includes an ozone generator 1, a first ozone uniform distributor 2, a red mud presoak slurry washing tower 3, a second ozone uniform distributor 4, a red mud presoak tank 5, and a red mud presoak slurry tank 6. Process water pipeline 7, dehydration tank 8, red mud pre-soaked liquid tank 9, red mud pre-soaked liquid washing tower 10, demister 11 and chimney 12;

[0065] Wherein, the upper part of the red mud presoaked slurry washing tower 3 is provided with a spray layer, and the tower wall below the spray layer is provided with a flue gas inlet to connect with the alumina roasting flue gas pipeline, and the alumina roasting flue gas pipeline is provided with a There is a first ozone uniform distributor 2; the upper part of the red mud presoaked liquid washing tower 10 is provided with a spray layer, and the tower wall below the spray la...

Embodiment 2

[0067] This example provides a method for desulfurization and denitrification of flue gas from alumina roasting, which is carried out by using the desulfurization and denitrification system of flue gas from alumina roasting described in Example 1, and desulfurization and denitrification of 500,000 tons / year alumina roasting furnace , SO in flue gas 2 The concentration is 250mg / m 3 , NO x The concentration is 500mg / m 3 .

[0068] Specifically include the following steps:

[0069] (a) Ozone produced in the ozone generator 1 is mixed in the flue gas of alumina roasting through the first ozone uniform distributor 2, wherein ozone and NO in the flue gas of alumina roasting x The molar ratio is 0.4:1, and the alumina roasting flue gas mixed with ozone is sent to the red mud pre-soaking slurry washing tower 3, and the slurry with a pH of 4 obtained after red mud pre-soaking from the red mud pre-soaking tank 5 is processed. Reverse spraying to obtain flue gas after primary treatm...

Embodiment 3

[0073] This embodiment provides a method for desulfurization and denitrification of flue gas from alumina roasting. The method is carried out by using the desulfurization and denitrification system of flue gas from alumina roasting described in Example 1. The treatment method refers to the method in Example 2. The only difference is: the steps (a) Ozone and NO in alumina roasting flue gas x The molar ratio is 0.8:1, the pH of the slurry obtained after red mud presoaking is 5, and the ozone and the remaining NO in the flue gas after primary treatment in step (b) x The molar ratio is 0.4:1, and the pH of the supernatant obtained after red mud presoaking is 9.

[0074] SO in the purified flue gas in this example 2 The concentration is 6mg / m 3 , NO x The concentration is 60mg / m 3 .

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Abstract

The invention provides an alumina roasting flue gas desulfurization and denitrification system, method and application. The system includes an ozone generator, a red mud pre-soaked slurry washing tower, a red mud pre-soaked tank and a red mud pre-soaked liquid washing tower. The present invention reduces the NO in the flue gas by ozone x Oxidation into high-valent nitrogen oxides, using red mud as an absorbent, and at the same time realizing SO in flue gas 2 and NO x synergistic absorption, and simultaneous realization of red mud dealkalization. The present invention utilizes the Fe in the red mud slurry 3+ The synergistic catalytic oxidation of metal ions and ozone promotes the synergistic absorption of sulfur and nitrate, reducing the material consumption of subsequent desulfurization and denitrification; the structure of double-tower hierarchical absorption is adopted, and the absorption of sodium and alkali in the second-stage tower overcomes the low O 3 / NO x NO at molar ratio 2 The problem of difficult absorption, while reducing the risk of ozone depletion and escape, has the advantages of high purification efficiency and low operating cost, and has strong applicability to alumina roasting flue gas.

Description

technical field [0001] The invention belongs to the technical field of pollutant control, and relates to an alumina roasting flue gas desulfurization and denitrification system, method and application. Background technique [0002] The aluminum industry has an extremely important position and role in my country's national economic and social development. During the aluminum smelting process, especially the alumina roasting process, a large amount of SO is emitted 2 and NO x . my country's alumina production generally adopts circulating fluidized roasting furnaces. During the roasting process, a large amount of gas is consumed, and the temperature is as high as 900 ° C ~ 1100 ° C. The H in the gas 2 SO is produced during the combustion of S 2 , SO 2 The chimney emission concentration is 250mg / m 3 At the same time, a large amount of NO is generated during the combustion process x , its concentration is as high as 400mg / m 3 ~600mg / m 3 around, much higher than the SO in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/86B01D53/50B01D53/56
CPCB01D53/8609B01D53/8625B01D2251/104B01D2255/20738B01D2258/0283B01D53/60B01D53/80B01D53/8637B01D2258/02Y02A50/20B01D53/1431B01D53/185B01D53/75B01D53/90B01D2251/304B01D2257/302B01D2257/404B01D2258/025
Inventor 朱廷钰刘霄龙王雪宁汝亮
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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