Device and method for simultaneously desulfurizing and denitrifying flue gas by ozone catalytic oxidation process

An ozone catalytic oxidation, desulfurization and denitrification technology, applied in industrial boilers, industrial kilns, and power plants, can solve the problems of secondary pollution, desulfurization by-products such as calcium sulfate, low value, and difficulty in large-scale development.

Inactive Publication Date: 2011-11-23
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing process has many advantages and can meet the requirements of environmental protection, but the disadvantages are high investment and operating costs, low value of desulfurization by-products such as calcium sulfate, and even secondary pollution problems, and denitrification is worthless By-product N 2 , but consumes a large amount of reducing agent ammonia and expensive catalyst
The structure of the oxidizer in this process is complicated, and it is not easy to enlarge
[0011] In summary, there are still deficiencies in the existing simultaneous desulfurization and denitrification process, and the desulfurization and denitrification technology needs to be further improved

Method used

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  • Device and method for simultaneously desulfurizing and denitrifying flue gas by ozone catalytic oxidation process
  • Device and method for simultaneously desulfurizing and denitrifying flue gas by ozone catalytic oxidation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Flue gas condition: 15000Nm 3 / h, SO 2 Concentration 1200ppm (3428mg / Nm 3 ), NO concentration 460ppm (616mg / Nm 3 ), the temperature is 150°C.

[0050] The flue gas enters the desulfurization tower (the desulfurization tower is a plate corrugated structured packing tower), the amount of ozone added is 53.4kg / h, and the absorption liquid (the concentration of potassium permanganate is 100ppm) is sprayed into the tower from the upper part of the tower, and the flow rate is 10t / h h. SO in the flue gas exiting the top of the tower 2 The content is 116mg / Nm 3 , NO concentration is 49.3mg / Nm 3 , the desulfurization rate is 96.6%, and the denitrification rate is 92%. After desulfurization and denitrification, the flue gas enters the chimney from the top of the tower after demisting by the demister. After 40 hours, 10 tons of mixed acid containing 30.4% sulfuric acid and 7.1% nitric acid were obtained.

Embodiment 2

[0052]Flue gas condition: 6500Nm 3 / h, SO 2 Concentration 450ppm (1286mg / Nm 3 ), NO concentration 230ppm (308mg / Nm 3 ), the temperature is 140°C.

[0053] The flue gas enters the desulfurization tower (the desulfurization tower is an empty tower), the amount of ozone added is 9.49kg / h, and the absorption liquid (wherein the concentration of potassium permanganate is 30ppm) is sprayed into the tower from the upper part of the tower, and the flow rate is 5t / h. Add 20% ammonia water 26.9kg / h to the absorption liquid. SO in the flue gas exiting the top of the tower 2 The content is 38.6mg / Nm 3 , NO concentration is 18.5mg / Nm 3 , the desulfurization rate is 97%, and the denitrification rate is 94%. After the flue gas is desulfurized and denitrified, the flue gas enters the chimney from the top of the tower after demisting by the demister. After 90 hours, the ammonium sulfate concentration reached 30% and the ammonium nitrate concentration reached 9% in the 5 tons of absorpt...

Embodiment 3

[0055] Flue gas condition: 45000Nm 3 / h, SO 2 Concentration 620ppm (1771mg / Nm 3 ), NO concentration 340ppm (455mg / Nm 3 ), the temperature is 160°C.

[0056] The flue gas enters the desulfurization tower (the desulfurization tower is an empty tower), the amount of ozone added is 94.1kg / h, and the absorption liquid (the concentration of potassium permanganate is 50ppm) is sprayed into the tower from the upper part of the tower, and the flow rate is 30m 3 / h, add potassium carbonate 213.1kg / h in the absorption solution. SO in the flue gas exiting the top of the tower 2 The content is 35.4mg / Nm 3 , NO concentration is 22.7mg / Nm 3 , the desulfurization rate is 98%, and the denitrification rate is 95%. After the flue gas is desulfurized and denitrified, the flue gas enters the chimney from the top of the tower after demisting by the demister. After 21 hours, the concentration of potassium sulfate in the 30 tons of absorption liquid reached 15%, and the concentration of potas...

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Abstract

The invention relates to a flue gas pollutant treatment process and aims to provide a device and method for simultaneously desulfurizing and denitrifying a flue gas by ozone catalytic oxidation process. The device comprises a desulfurization and denitrification tower, an ozone generator, absorption liquid circulating equipment and desulfurization and denitrification by-product post-treatment equipment. Ozone enters from a flue or the lower part of the desulfurization and denitrification tower, a catalyst is added to an absorption liquid, and the absorption liquid is injected in from the upper part of the desulfurization and denitrification tower, so that SO2 and NO in the flue gas are oxidized by ozone with high efficiency under the action of the catalyst, and in combination with the absorption of water or alkaline substances, SO2 and NOx in the flue gas are recovered in the form of high value-added sulfuric acid and nitric acid products, or ammonium sulfate / ammonium nitrate mixed nitrogen fertilizers, potassium sulfate / potassium nitrate mixed potassium fertilizers or ammonium / potassium compound fertilizers respectively, thereby achieving resource recovery and value maximization of the desulfurization and denitrification process. The desulfurization and denitrification process provided by the invention has the advantages of simple structure, low investment and low operation cost. The desulfurization rate and the denitrification rate of the desulfurization and denitrification process provided by the invention can reach more than 96% and more than 90% respectively.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for using ozone to catalyze the oxidation of NO and SO in flue gas 2 A device and a method for completing simultaneous desulfurization and denitrification in one device, and separately realizing resource utilization of sulfur and nitrogen elements, applicable to power plants, industrial boilers and industrial kilns. Background technique [0002] my country is a big coal-burning country, and coal accounts for 75% of the total primary energy consumption. The massive consumption of energy has caused serious air pollution, the most prominent of which is SO 2 and NO x Acid rain hazards from emissions, and NO x Ozone layer depletion and photochemical smog. According to the "First National Pollution Source Survey Bulletin" published by the Ministry of Environmental Protection on February 6, 2010, in 2007, my country's sulfur dioxide emissions were 23.20 mil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/76B01D53/86B01D53/73B01D53/60C01B17/69C01B21/38C05C13/00C05D1/00C05D11/00
CPCY02A50/20
Inventor 方云进聂美园方美琴杜伟超钟凯立徐兴军徐瑞峰
Owner EAST CHINA UNIV OF SCI & TECH
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