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Method and device for simultaneously desulfurizing and denitrifying flue gas by photo-catalysis and oxidation

A photocatalytic oxidation, desulfurization and denitrification technology, applied in the field of simultaneous desulfurization and denitrification, can solve problems such as treatment capacity limitation

Active Publication Date: 2017-05-10
OCEAN UNIV OF CHINA
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0008] Chinese patent CN104707475A discloses a low-temperature photocatalytic self-redox and simultaneous desulfurization and denitrification flue gas treatment method, which provides the preparation of TiO 2 The nanotube array or carbon nitride is used as a carrier, and the supported catalyst method is supported by manganese dioxide, cobalt oxide, nickel oxide and graphitic carbon nanoparticles. The experiment proves that the catalyst can promote SO at low temperature. 2 Auto-oxidation-reduction reaction occurs between NOx and NOx, but the catalyst is a millimeter-scale granular particle, which will limit the processing capacity in the process of industrial application

Method used

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  • Method and device for simultaneously desulfurizing and denitrifying flue gas by photo-catalysis and oxidation
  • Method and device for simultaneously desulfurizing and denitrifying flue gas by photo-catalysis and oxidation
  • Method and device for simultaneously desulfurizing and denitrifying flue gas by photo-catalysis and oxidation

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Embodiment 1

[0075] The structure of the flue gas catalytic oxidation simultaneous desulfurization and denitrification device of the present invention is as follows: figure 1 As shown, the device includes a housing 2, the housing 2 is designed as a rectangular parallelepiped in a shape suitable for an ultraviolet lamp, there is a smoke inlet 1 on the top of the housing 2, and a smoke outlet 13 on the side near the bottom . The housing 2 is provided with a vacuum ultraviolet lamp group, a photocatalytic bed and a sprayer along the gas flow direction. The gas flow direction is from top to bottom in the axial direction of the cylinder body 2. The vacuum ultraviolet lamp group has three layers, and each layer consists of 4 microwave electrodeless ultraviolet lamps 3 are arranged in a 2×2 rectangular array, and a photocatalytic bed is arranged close to the directly below the vacuum ultraviolet lamp group. The photocatalytic bed is composed of a sheet-shaped supported catalyst 5 and a 365nm ultr...

Embodiment 2

[0088] In case 2 as figure 1 The ultraviolet lamp group and the sprayer are installed as shown, the ultraviolet lamp group is specifically a three-layer microwave electrodeless ultraviolet lamp group, each layer is composed of 4 microwave electrodeless ultraviolet lamps 3 arranged in a 2×2 rectangular array, and the sprayer is composed of atomizing nozzles 14 , absorption liquid delivery pipe 6,9, sprayer branch pipe 15 and pump 7 are formed. In Example 2, an appropriate amount of tap water is preloaded into the liquid collection tank 11, and the ultraviolet lamp group and the pump 7 are turned on. After the system is in a stable state, 500 m³ / h SO is introduced from the flue gas inlet 1. 2 , NO and NO 2 The concentration of flue gas is 2600mg / m³1500mg / m³ and 100mg / m³ respectively, the moisture content of the flue gas is 8%, and the temperature is about 60°C. The exhaust gas detection results show that SO 2 and NOx removal rates were 41% and 97%, respectively.

Embodiment 3

[0090] A photocatalyst bed and a sprayer are installed in the housing 2 as shown in the figure. The specific installation method of the photocatalyst bed is that the photocatalyst bed is composed of a sheet-shaped supported catalyst 5 and a 365nm ultraviolet lamp 4. Each sheet-shaped supported The catalyst has holes for rod-shaped 365nm ultraviolet lamps to penetrate, and multiple pieces of sheet-shaped supported catalysts are aligned and aligned in parallel to form a combination. Multi-layer combinations are stacked to form a photocatalyst bed, in which every two rectangular sheet-shaped supported catalysts are connected end to end. The angle θ between them is 110°. After the catalyst bed is installed, a 365nm ultraviolet lamp is inserted through the hole of the sheet-shaped supported catalyst 5. The atomizer consists of an atomizing nozzle 14, absorption liquid delivery pipes 6, 9, atomizer branch pipe 15 and a pump 7. Supported catalyst 5 was prepared by the impregnation me...

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Abstract

The invention discloses a method and device for simultaneously desulfurizing and denitrifying flue gas by photo-catalysis and oxidation. The method comprises the following steps: firstly, enabling the flue gas to enter a vacuum ultraviolet irradiation region; under high-energy ultraviolet irradiation, generating active free radicals and ozone for oxidizing to remove partial SO2 and NOx in the flue gas; then enabling the flue gas to penetrate through a whole type photocatalyst bed layer; purifying and removing the SO2 and the NOx under the synergistic effect of the photo-catalysis and oxidation and catalytic ozonation; enabling acid-containing flue gas to enter an atomization absorption region; under an absorption effect, washing and removing desulfurizing and denitrifying products, namely H2SO4 and HNO3. The device for desulfurizing and denitrifying the flue gas is composed of the vacuum ultraviolet irradiation region, the whole type photocatalyst bed layer and the atomization absorption region. By adopting the catalyst bed layer designed by the invention, 100 percent of ultraviolet light can be illuminated to the surface of a catalyst, and nearly 100 percent of the surface of the catalyst can also receive the ultraviolet light; the problem that the light illumination utilization rate in a traditional photo-catalysis waste gas treatment process is not ideal is solved.

Description

technical field [0001] The invention relates to a method and device for simultaneous desulfurization and denitrification by using photocatalytic technology, belonging to the field of air pollution control. Background technique [0002] SO 2 As two main ambient air pollutants, NOx and NOx have immeasurable adverse effects on the natural environment and human health. 2 and NOx pollutant emission control is very important. According to the ambient air quality standard GB 3095-2012 implemented on January 1, 2016 and the binding target of reducing the total national emissions by more than 10% proposed in the "Thirteenth Five-Year Plan", the SO 2 And NOx emission concentration limit will be more stringent, correspondingly, some more efficient and economical desulfurization and denitrification technologies should appear. [0003] The existing post-combustion flue gas desulfurization and denitrification technology can be divided into two types according to the process characteris...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/60
CPCB01D53/007B01D53/8637B01D2251/104B01D2258/0283B01D2259/804Y02A50/20
Inventor 李春虎袁国峰侯立威卞俊杰王文泰冯丽娟王亮
Owner OCEAN UNIV OF CHINA
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