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A method for simultaneously removing high-load sulfur dioxide and nitrogen oxides from waste gas

A technology for sulfur dioxide and nitrogen oxides, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of low removal rate and low concentration of nitrogen oxides, and achieve the effect of improving removal efficiency

Active Publication Date: 2020-01-14
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Aiming at the defects of relatively low treatment concentration and low removal rate in the simultaneous removal of sulfur dioxide and nitrogen oxides in biofilm packed towers in the prior art, the present invention provides a simultaneous removal of high A method for loading sulfur dioxide and nitrogen oxides, which improves the simultaneous removal efficiency of sulfur dioxide and nitrogen oxides at high loads by setting the molar concentration ratio of sulfur dioxide and nitrogen oxides in the exhaust gas

Method used

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  • A method for simultaneously removing high-load sulfur dioxide and nitrogen oxides from waste gas
  • A method for simultaneously removing high-load sulfur dioxide and nitrogen oxides from waste gas
  • A method for simultaneously removing high-load sulfur dioxide and nitrogen oxides from waste gas

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Embodiment 1

[0046] The exhaust gas in this embodiment comes from the simulated flue gas generated by the gas generating device. Before entering the synchronous desulfurization and denitrification packed tower, the simulated flue gas is first passed into the mixing device to mix the simulated flue gas with air.

[0047] Such as figure 1 As shown, the biofilm packing tower inlet 1, gas flow meter 2, intake pipeline 3, packing container 4, nutrient solution spraying device 5, exhaust Air port 6 , nutrient solution inflow pipeline 7 , peristaltic pump 8 , nutrient solution storage container 9 and nutrient solution outflow pipeline 10 .

[0048] The air inlet 1 is used for waste gas to enter the packed tower, and the gas is passed through the air inlet 1, and enters the packing container 4 of the packed tower through the air inlet line 3, and the process is passed through the air inlet line 3 The gas flow meter 2 on the top regulates the gas flow rate, and the generated gas is discharged thro...

Embodiment 2

[0057] This embodiment is basically the same as Embodiment 1, the difference is:

[0058] The concentration of sulfur dioxide at the air inlet 1 in this embodiment is 2850-3050mg / m 3 , the concentration of nitrogen oxides is 2150~2230mg / m 3 , The molar concentration ratio of sulfur dioxide and nitrogen oxides in the exhaust gas is 0.76:1.

[0059] The filler is ceramsite with a diameter of 200mm, and the desulfurization and denitrification treatment described in step 2) is carried out under an aerobic environment, and the aerobic environment is provided by air, and the oxygen concentration in the air is 20%. The flow is kept at 0.2m 3 / h, the gas residence time is 110 seconds, and the liquid-gas ratio is 40L / m 3 .

[0060] The operating temperature of the packed tower is 35°C.

[0061] After running for 2 cycles, detect the concentration of sulfur dioxide and nitrogen oxides in the exhaust gas at the outlet; after testing, the concentration of sulfur dioxide at the 6 outlet...

Embodiment 3

[0063] This embodiment is basically the same as Embodiment 1, the difference is:

[0064] The concentration of sulfur dioxide at the air inlet 1 in this embodiment is 2930-3000mg / m 3 , the concentration of nitrogen oxides is 1680~2000mg / m 3 , The molar concentration ratio of sulfur dioxide and nitrogen oxides in the exhaust gas is 1.06:1.

[0065] The filler is a porous acid-resistant plastic material with a diameter of 100mm, and the desulfurization and denitrification treatment in the step 2) is carried out in an aerobic environment, the aerobic environment is provided by air, and the oxygen concentration in the air is 20 %, set the air flow to keep at 0.2m 3 / h, the gas residence time is 110 seconds, and the liquid-gas ratio is 40L / m 3 .

[0066] The operating temperature of the packed tower is 30°C.

[0067] After running for 2 cycles, detect the concentration of sulfur dioxide and nitrogen oxides in the exhaust gas at the outlet; after testing, the concentration of s...

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Abstract

The invention discloses a method for simultaneously removing high-load sulfur dioxide and nitrogen oxides in waste gas, and belongs to the technical field of biological method industrial waste gas purification. In the method, waste gas is passed into a synchronous desulfurization and denitrification packed tower for waste gas removal, and the packing of the packed tower is loaded with microbial flora for synchronously removing sulfur dioxide and nitrogen oxides, and the amount of sulfur dioxide and nitrogen oxides in the waste gas The molar concentration ratio is (0.76~1.06):1. Compared with the synchronous desulfurization and denitrification system in the prior art, the synchronous desulfurization and denitrification efficiency of the present invention significantly improves the synchronous removal efficiency, further reduces the concentration of sulfur dioxide or nitrogen oxides in the flue gas, and reduces the treatment cost. It is a clean A novel reaction method with high efficiency and low cost is conducive to popularization.

Description

technical field [0001] The invention relates to the technical field of biological industrial waste gas purification, in particular to a method for simultaneously removing high-load sulfur dioxide and nitrogen oxides in waste gas. Background technique [0002] Sulfur oxide SO X and nitrogen oxides NO X It is the main air pollutant, which is emitted during the combustion of fossil fuels. Nitrogen oxide NO X Contains a variety of compounds, including NO and NO 2 are major pollutants and cause serious environmental problems due to their role in photochemical smog, acid rain and ozone depleting agents. Sulfur dioxide SO 2 is sulfur oxide SO X The most important part, accounting for more than 96%, so it can generally be SO 2 stands for sulfur oxides. SO 2 Directly lead to the formation of acid rain and the loss of the ozone layer. Thanks to SO X and NO X Emissions and environmental pollution are increasingly concerned, and the flue gas cleaning process has attracted wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/85B01D53/60
CPCB01D53/60B01D53/85B01D2258/02B01D2251/95Y02A50/20B01D2257/302B01D2257/404B01D2258/0283B01D53/502B01D53/504B01D53/56B01D53/82B01D53/83B01D2251/306B01D2251/402B01D2251/608B01D2251/80B01D2259/124
Inventor 李侃张徐祥任洪强孙珮石张志超
Owner NANJING UNIV
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