Integrated flue gas treatment device and method

A treatment device and flue gas technology, applied in chemical instruments and methods, combined devices, separation methods, etc., can solve problems such as high desulfurization operating costs, waste of steam resources, blockage of crystal slurry transportation pipelines, etc., and achieve resource utilization , Improve the removal efficiency and reduce the effect of flue gas with water

CN104857835AActive Publication Date: 2015-08-26ZHONGJING ENVIRONMENTAL TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2015-08-26

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Abstract

The invention discloses an integrated flue gas treatment device and method. The device comprises flue gas treatment equipment, ozone supply equipment, hydrogen peroxide supply equipment, evaporation and concentration equipment, cyclic sedimentation equipment and the like, wherein the flue gas treatment equipment comprises an ozone spray oxidation reaction layer, a hydrogen peroxide spray oxidation reaction layer, an absorber spray area, a slurry circulation area and a dust and mist removal area; both the ozone spray oxidation reaction layer and the hydrogen peroxide spray oxidation reaction layer are arranged in the absorber spray area; the dust and mist removal area is positioned above the absorber spray area; both the evaporation and concentration equipment and the cyclic sedimentation equipment are arranged in the flue gas treatment equipment. The device and the method disclosed by the invention are suitable for comprehensive treatment of flue gas containing SO2, NOX, Hg and dust and resource utilization of liquid waste in coal fired boilers, iron and steel sintering machines, pellets, industry kiln stoves and the like.
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Description

technical field

[0001] The present invention relates to an integrated treatment device and method for flue gas, especially a device and method for simultaneously removing sulfur dioxide, nitrogen oxides, mercury and dust in flue gas, and using the waste liquid to produce magnesium sulfate and magnesium nitrate by-products . Background technique

[0002] Industrial flue gas contains a large amount of dust, sulfur dioxide (SO 2 ), nitrogen oxides (NO X ) and other harmful substances, which are the main precursors and important sources of acid rain and smog. Elemental mercury (Hg 0 ) is the only toxic heavy metal that is gaseous at normal temperature and pressure. It has the ability to diffuse over long distances and is a global pollutant. Although the mercury content in industrial flue gas is very low, its harm to the environment cannot be ignored due to the large amount of flue gas. Therefore, the control of SO in industrial flue gas 2 , NO X , mercury and dust emissio...

Examples

Embodiment approach

[0133] The method of the present invention comprises a flue gas oxidation step, which is used to synergistically oxidize low-valent nitrogen oxides and elemental mercury in the flue gas by utilizing ozone and hydrogen peroxide in the ozone spray oxidation reaction layer and the hydrogen peroxide spray oxidation reaction layer, and Forms hypervalent nitrogen oxides and mercury oxides. Preferably, the flue gas oxidation step of the present invention includes: in the ozone spray oxidation reaction layer, spray ozone downward through the ozone atomization spray part; in the hydrogen peroxide spray oxidation reaction layer, spray The shower unit sprays hydrogen peroxide downwards. The atomization and spraying process used in the flue gas oxidation step is not particularly limited, and those well known in the art can be used. According to one embodiment of the present invention, the flue gas oxidation step preferably uses stainless steel nozzles to spray ozone and hydrogen peroxide. ...

Embodiment 1

[0154] figure 1A schematic diagram of the device of Example 1 of the present invention is shown. It can be seen from the figure that the flue gas integrated treatment device of the present invention includes a desulfurization tower 1 , an ozone generator 8 , a hydrogen peroxide storage tank 9 and a rotary dust and mist eliminator 7 . The desulfurization tower 1 includes an ozone spray oxidation reaction layer 82, a hydrogen peroxide spray oxidation reaction layer 92, an absorption spray area 6, a slurry circulation pool 2, an evaporation concentration spray layer 4 and a circulation settling tank 3, wherein the ozone spray oxidation reaction layer 82 and the hydrogen peroxide spray oxidation reaction layer 92 are both set in the absorption spray area 2; the rotary dust and mist eliminator 7 is located above the absorption spray area 6; Tower 1 interior. The absorption spray area 6 includes a first absorption spray layer 61 , a second absorption spray layer 62 and a third abs...