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A device and process for deep oxidation desulfurization and denitrification of industrial flue gas

A deep oxidation, industrial flue gas technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problem of difficult recycling of nitrate/nitrite mixture, single, insufficient removal rate of nitrogen oxides, etc. problems, to achieve the effect of improving technical economy, improving removal efficiency, and improving denitrification efficiency

Active Publication Date: 2020-12-22
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] In view of the problems existing in the prior art, the present invention provides a device and process for deep oxidation desulfurization and denitrification of industrial flue gas, which solves the problem of insufficient nitrogen oxide removal rate in the existing ozone oxidation desulfurization and denitrification process, and the nitrate / nitrous acid The salt mixture is difficult to recycle. Through the ozone partial deep oxidation desulfurization and denitrification process described in the present invention, the removal rate of nitrogen oxides can be effectively improved. During the absorption process, nitrogen oxides are converted into a single nitrate, which can be further evaporated Recycling in the form of crystallization not only avoids environmental pollution, but also improves economic benefits

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  • A device and process for deep oxidation desulfurization and denitrification of industrial flue gas

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Embodiment 1

[0033] This embodiment provides a device for deep oxidation desulfurization and denitrification of industrial flue gas. The device includes the first absorption tower 1, the second absorption tower 2, the ozone generator 3, the induced draft fan 4 and the 2 The demister 5 on the top; the outlet pipeline of the first absorption tower 1 is divided into two roads, one road is connected with the bottom of the absorption section of the second absorption tower 2, and an induced draft fan 4 is set on this pipeline, and this pipe Road is connected with the ozone conveying pipe of ozone generator 3; Another road is connected with the top of the second absorption tower 2 absorption sections;

[0034] Using the above device to carry out deep oxidation, desulfurization and denitrification of coke oven flue gas discharged by a coking enterprise, the flue gas flow rate is 10000Nm 3 / h, SO 2 Concentration 500mg / Nm 3 , NO x Concentration 400mg / Nm 3 .

[0035] The specific method is:

[...

Embodiment 2

[0039] Using the oxidative desulfurization and denitrification device provided in Example 1 to carry out deep oxidative desulfurization and denitrification of the coke oven flue gas discharged by a coking enterprise, the flue gas flow rate is 5000Nm 3 / h, SO 2 Concentration 300mg / Nm 3 , NO x Concentration 500mg / Nm 3 .

[0040] The specific method is:

[0041] The above-mentioned flue gas is desulfurized through the first absorption tower 1; the 4000Nm 3 / h of flue gas is drawn out and mixed with ozone from the ozone generator 3, the amount of ozone introduced is 2.87kg / h, and the molar ratio of NO to the total amount of flue gas is 1.1; after the flue gas is mixed with ozone and undergoes deep oxidation, Enter the bottom of the second absorption tower 2 to absorb and remove NOx. The absorbent in this absorption tower is quicklime slurry, and the pH of the absorption reaction is controlled at about 5.0. The remaining 1000Nm 3 / h The flue gas enters the upper part of the ...

Embodiment 3

[0044] The oxidative desulfurization and denitrification device provided in Example 1 is used to carry out deep oxidation desulfurization and denitrification of the sintering flue gas discharged by a certain iron and steel enterprise, and the flue gas flow rate is 20000Nm 3 / h, SO 2 Concentration 2000mg / Nm 3 , NO x Concentration 300mg / Nm 3 .

[0045] The specific method is:

[0046] The above-mentioned flue gas is desulfurized through the first absorption tower 1; the 12000Nm 3 / h of flue gas is drawn out and mixed with ozone from the ozone generator 3, the amount of ozone introduced is 5.95kg / h, and the molar ratio of NO to the total amount of flue gas is 0.95; after the flue gas is mixed with ozone and undergoes deep oxidation, Enter the bottom of the second absorption tower 2 for absorption and removal. The absorbent in this absorption tower is ammonia water, and the pH of the absorption reaction is controlled at about 6.0. The remaining 8000Nm 3 / h The flue gas ente...

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Abstract

The invention relates to an apparatus and a process for deep oxidative desulfurization and denitrification of industrial flue gas. The apparatus comprises a first absorption tower 1, a second absorption tower 2, an ozone generator 3, an induced draft fan 4 and a demister 5 positioned on the upper portion of the second absorption tower 2, wherein the gas outlet pipeline of the first absorption tower 1 is divided into two parts, one part of the gas outlet pipeline is connected to the lower portion of the absorption section of the second absorption tower 2, is provided with the induced draft fan4, and is connected to the ozone conveying pipeline of the ozone generator 3, and the other part of the gas outlet pipeline is connected to the upper portion of the absorption section of the second absorption tower 2. According to the present invention, with the application of the apparatus to perform deep oxidative desulfurization and denitrification on industrial flue gas, the advantages of lessozone consumption, high nitrogen oxide removal rate, low cost and the like can be achieved; and the apparatus and the method are suitable for the desulfurization and denitration of steel and iron ornon-ferrous metallurgical sintering flue gas and industrial furnace flue gas, and have good economic benefits and broad application prospects.

Description

technical field [0001] The invention relates to the field of flue gas pollution control, in particular to a device and process for deep oxidation, desulfurization and denitrification of industrial flue gas. Background technique [0002] my country SO 2 and NO x Emissions of air pollutants such as air pollutants remain high, environmental protection standards are becoming increasingly stringent, and enterprises are facing severe pressure to reduce emissions. Especially in iron and steel, coking and other industries, due to the low temperature of flue gas such as coke oven and sintering (coke oven flue gas 250-300°C, 150-200°C after waste heat recovery; sintering flue gas is about 150°C), conventional SCR denitrification technology is difficult to achieve efficient denitrification and cannot be directly applied. At the same time, the SCR denitrification technology occupies a large area, and the investment and operation costs are high. Therefore, there is an urgent need for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/76B01D53/56B01D53/75
Inventor 李会泉孟子衡王兴瑞
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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