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Fume desulfurizing and denitrifying device based on magnesia and method

A technology of desulfurization and denitrification, magnesium oxide, applied in the direction of chemical instruments and methods, separation methods, magnesium sulfate, etc., can solve the problems of secondary pollution, desulfurization by-products such as calcium sulfate, low value, and difficult to scale up

Inactive Publication Date: 2012-02-15
EAST CHINA UNIV OF SCI & TECH
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  • 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
[0014] 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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  • Fume desulfurizing and denitrifying device based on magnesia and method
  • Fume desulfurizing and denitrifying device based on magnesia and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Flue gas condition: 15000Nm 3 / h, SO 2 Concentration 1200ppm (3428mg / Nm 3 ), NO concentration 460ppm (616mg / Nm 3 ), the temperature is 150℃. Magnesium oxide slurry concentration 10%, volume 3.7m 3 .

[0041] The flue gas enters the desulfurization tower (the desulfurization tower is a spray tower), the ozone addition amount is 15.5kg / h, and the absorption liquid (including Cu 2+ The concentration of 50ppm) is sprayed into the tower from the upper and lower parts of the ozone inlet at a flow rate of 15t / h. SO in the flue gas at the top outlet 2 The content is 110mg / Nm 3 , the NO concentration is 38 mg / Nm 3 , the desulfurization rate is 96.8%, and the denitration rate is 93.8%. After desulfurization and denitrification, the flue gas enters the chimney from the top of the tower after being defogged by the mist eliminator. After 10 hours, a mixed solution containing 25.2% of magnesium sulfate and 5.78% of magnesium nitrate was obtained. A part of the absorption l...

Embodiment 2

[0043] Flue gas condition: 6500Nm 3 / h, SO 2 Concentration 450ppm (1286mg / Nm 3 ), NO concentration 230ppm (308mg / Nm 3 ), the temperature is 140℃. Magnesium oxide slurry concentration 10%, volume 3.0m 3

[0044] The flue gas enters the desulfurization tower (the desulfurization tower is a spray tower), the ozone addition amount is 3.36kg / h, and the absorption liquid (of which Fe 2+ The concentration of 80ppm) is sprayed into the tower from the upper and lower parts of the ozone inlet at a flow rate of 10t / h. SO in the flue gas at the top outlet 2 The content is 40mg / Nm 3 , the NO concentration is 20 mg / Nm 3, the desulfurization rate is 96.9%, and the denitration rate is 93.5%. After desulfurization and denitrification, the flue gas enters the chimney from the top of the tower after being defogged by the mist eliminator. After 47 hours, a mixed solution containing 23.6% of magnesium sulfate and 7.2% of magnesium nitrate was obtained. A part of the absorption liquid wa...

Embodiment 3

[0046] Flue gas condition: 45000Nm 3 / h, SO 2 Concentration 320ppm (914mg / Nm 3 ), NO concentration 670ppm (897mg / Nm 3 ), the temperature is 160℃. Magnesium oxide slurry concentration 15%, volume 7m 3 .

[0047] The flue gas enters the desulfurization tower (the desulfurization tower is a spray tower), the ozone addition amount is 61.3kg / h, and the absorption liquid (including Co 2+ The concentration of 100ppm) is sprayed into the tower from the upper and lower parts of the ozone inlet at a flow rate of 30t / h. SO in the flue gas at the top outlet 2 The content is 20mg / Nm 3 , the NO concentration is 67 mg / Nm 3 , the desulfurization rate is 97.8%, and the denitration rate is 92.5%. After desulfurization and denitrification, the flue gas enters the chimney from the top of the tower after being defogged by the mist eliminator. After 21 hours, a mixed solution containing 22.6% of magnesium sulfate and 27.6% of magnesium nitrate was obtained. A part of the absorption liqui...

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Abstract

The invention relates to technology for treating fume pollutants and aims at providing a fume desulfurizing and denitrifying device based on magnesia and a method. The fume desulfurizing and denitrifying device based on the magnesia and the method are technically characterized in that SO2 is desorbed at the lower part of a desulfurizing and denitrifying tower by using magnesia slurry, a metal M2+ catalyst is added into circular absorption liquid, and air is also blown into the desulfurizing and denitrifying tower so as to quickly oxidize a desulfurized product of MgSO3 into MgSO4; ozone is introduced into the middle part of the desulfurizing and denitrifying tower so as to oxidize NO in fume into NOx; and the magnesia slurry is sprayed into the upper part of the tower, the NOx is absorbed, and magnesium nitrate is generated. Magnesium sulfate heptahydrate and magnesium nitrate hexahydrate can be respectively obtained by the conventional crystal separation of magnesium sulfate and the magnesium nitrate in the absorption liquid. According to the fume desulfurizing and denitrifying device based on the magnesia and the method, the desulfurizing and denitrifying procedures are finished in one tower by using the magnesia, and the recycle of the by-products of the SO2 and the NO is also realized. The fume desulfurizing and denitrifying device based on the magnesia and the method have simple desulfurizing and denitrifying processes, low investment, low resistance and low running cost. By adopting the fume desulfurizing and denitrifying device based on the magnesia and the method, the desulfurizing rate of more than 96 percent and the denitrifying rate of more than 92 percent can be obtained.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a flue gas desulfurization and denitrification device and method based on magnesium oxide, which completes desulfurization and denitrification in one device, and realizes the resource utilization of sulfur and nitrogen elements respectively. 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 atmospheric pollution, the most prominent of which is SO 2 and NO x Acid rain hazards from emissions, and NO x Destruction of the ozone layer and photochemical smog. According to the "First National Pollution Source Census Bulletin" issued by the Ministry of Environmental Protection on February 6, 2010, in 2007, my country's sulfur dioxide emissions were 23.20 million tons, 11.6664 million tons of soot, 17.977 million tons of nitrogen...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/56B01D53/50C01F5/40C01F5/38
Inventor 方云进聂美园李现娜方美琴徐兴军戢子龙徐瑞峰
Owner EAST CHINA UNIV OF SCI & TECH
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