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

A technology of sulfur dioxide and nitrogen oxides, which is applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of inability to improve synchronous removal efficiency and low removal rate of nitrogen oxides, and achieve improved waste gas removal effect and easy Operation and realization, the effect of good exhaust gas removal effect

Active Publication Date: 2021-07-30
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Aiming at the defects that the simultaneous desulfurization and denitrification packed tower system in the prior art has a high removal rate of sulfur dioxide and a low removal rate of nitrogen oxides, and cannot improve the synchronous removal efficiency, the present invention provides a simultaneous flue gas removal The method of removing sulfur dioxide and nitrogen oxides, by adjusting the molar concentration ratio of sulfur dioxide and nitrogen oxides entering the packed tower system, makes the microbial flora play a synergistic role, and improves the efficiency of simultaneous desulfurization and nitrogen removal

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

Examples

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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] like figure 1 As shown, the air inlet 1, the gas flow meter 2, the air inlet pipeline 3, the packing container 4, the nutrient solution spraying device 5, and the exhaust port 6 of the biofilm packed tower for simultaneous removal of sulfur dioxide and nitrogen oxides in this embodiment , 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 ...

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 1500-1700mg / m 3 , the concentration of nitrogen oxides is 1200~1400mg / m 3 , The molar concentration ratio of sulfur dioxide and nitrogen oxides in the exhaust gas is 0.65:1.

[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 outle...

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 described in this embodiment is 2000-2200 mg / m 3 , the concentration of nitrogen oxides is 1150~1250mg / m 3 , The molar concentration ratio of sulfur dioxide and nitrogen oxides in the exhaust gas is 1.05:1.

[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 concent...

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Abstract

The invention discloses a method for simultaneously removing 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 to remove the waste gas. The packing of the synchronous desulfurization and denitrification packed tower is loaded with microbial flora for synchronous removal of sulfur dioxide and nitrogen oxides. The sulfur dioxide and nitrogen oxides in the waste gas are The molar concentration ratio of nitrogen oxides is (0.65-1.05):1. The inventive method is to SO 2 The average removal rate of NOx reaches 99%, and the average removal rate of NOx reaches 76%, which improves the simultaneous removal efficiency of desulfurization and denitrification, further reduces the concentration of sulfur dioxide or nitrogen oxides in the flue gas, and reduces the treatment cost. It is a clean, efficient and low-cost new reaction method, which is beneficial 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 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. And the sulfur oxide SO X Only 2% to 4% of the sulfur is trioxide, so it can be simplified to sulfur dioxide SO 2 . 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 widespread attention. The Ministry of Ecology ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/85B01D53/60
CPCB01D53/60B01D53/85B01D2251/95B01D2258/02Y02A50/20
Inventor 任洪强张志超李侃张徐祥孙珮石
Owner NANJING UNIV
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