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Engineering system for removing NOx from flue gas in low temperature at rear end of desulfurizing tower

A desulfurization tower and flue gas technology, which is applied in the direction of air quality improvement, dispersed particle separation, chemical instruments and methods, etc., can solve the problems of large amount of desulfurization tower reconstruction, damage, etc.

Inactive Publication Date: 2014-03-26
张继惟
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Problems solved by technology

[0002] Most of the large and medium-sized kilns in China have completed desulfurization transformation since the Eleventh Five-Year Plan period. If the SCR method is used to remove NO x It is necessary to renovate the boiler and install it before the desulfurization tower, which will easily cause a large amount of reconstruction and damage to the desulfurization tower. However, if it is used after the desulfurization tower, the flue gas will have a large amount of moisture in a high-humidity environment after spraying and desulfurization, and the flue gas temperature will be about 50 ~60℃ lower

Method used

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  • Engineering system for removing NOx from flue gas in low temperature at rear end of desulfurizing tower

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Embodiment Construction

[0010] As shown in the figure, the flue gas enters the spray desulfurization tower 2 after being desulfurized through the dust collector 1, and then the compressed air 4 is sprayed into the flue gas through the air mixer 4, mixed and rectified by the static mixer, and under the action of the catalyst 7, NO and O in the air 2 The reaction produces NO which is soluble in water x Enter the bubbling absorption tower 8 and react with the absorbent 9 to form salts that are dissolved in the absorbent, and the purified flue gas is discharged from the chimney 12 through the induced draft fan 11 .

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Abstract

The invention relates to a system for removing NOx from kiln flue gas under the environment of high humidity (approximate to saturated humidity) and state approximate to normal temperature (40-60 DEG C) state. The system is used for efficiently removing NOx from flue gas with high temperature lower than 60 DEG C after calcium desulfurization, dual-alkali desulfurization and the like, so that SO2 and NOx in the flue gas can be fundamentally separated and absorbed to generate corresponding sulfates and nitrates, and most parts of particulate substances and Hg can be removed. The invention relates to a system for purifying flue gas by means of oxidizing NO in the flue gas through compressed air along the axial flow direction of a flue at the rear end of the existing flue gas desulfurizing tower to generate NO2 and NOx which are absorbed by an absorbent (water, ammonia water, alkali liquor and the like) under the special catalyst condition (low temperature and high humidity). The system provided by the invention can be widely applied to denitrating transformation of the existing desulfurization system.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a technical system for purifying flue gas. Background technique [0002] Most of the large and medium-sized kilns in China have completed desulfurization transformation since the Eleventh Five-Year Plan period. If the SCR method is used to remove NO x It is necessary to renovate the boiler and install it before the desulfurization tower, which will easily cause a large amount of reconstruction and damage to the desulfurization tower. However, if it is used after the desulfurization tower, the flue gas will have a large amount of moisture in a high-humidity environment after spraying and desulfurization, and the flue gas temperature will be about 50 ~60°C is lower. Contents of the invention [0003] In order to overcome the existing defects and constraints, use cheap compressed air to oxidize under low-temperature catalyst conditions, and at the same time use the absorpt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/90B01D53/79B01D53/60
CPCY02A50/20
Inventor 张继惟
Owner 张继惟
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