A Microwave-Coupled UV Photocatalytic Oxidation of Hg 0 Purification system and method

A technology of catalytic oxidation and purification system, applied in the field of flue gas purification, can solve the problems of high cost, large area and wide area of ​​mercury removal process, achieve synchronous heating and lighting, reduce operating costs, and improve utilization rate effect

Active Publication Date: 2021-10-15
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The SCR process can oxidize mercury to a certain extent, but because it is mainly a denitrification process, and has the disadvantages of large investment costs and a large area, so finding a new mercury removal technology is a strategy to achieve sustainable development in my country need
[0004] In order to reduce the problems of high cost and large occupied area of ​​the existing mercury removal process, the present invention strives to efficiently oxidize Hg by coupling ultraviolet light with microwaves 0 make it into Hg 2+ In order to achieve the removal of Hg 0 Effect

Method used

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  • A Microwave-Coupled UV Photocatalytic Oxidation of Hg <sup>0</sup> Purification system and method
  • A Microwave-Coupled UV Photocatalytic Oxidation of Hg <sup>0</sup> Purification system and method
  • A Microwave-Coupled UV Photocatalytic Oxidation of Hg <sup>0</sup> Purification system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Liquid-phase composite oxidant: the concentration of sodium persulfate is 5%wt, and the pH is 5.5.

[0068] Liquid phase absorbent: potassium chloride concentration is 5% wt, pH is 7.

[0069] The reaction conditions of the microwave-coupled ultraviolet photocatalytic oxidative desulfurization and denitrification system are shown in Table 2.

[0070] Table 2 Reaction conditions

[0071] condition scope Microwave set temperature 50℃ Microwave setting power 300W Mercury generator water bath temperature 60℃ Photocatalyst Reactor Energy Density 300KW / m 3

[0072] Purify the flue gas according to the above conditions, and it is found that the mercury removal efficiency reaches 92%.

Embodiment 2

[0074] Liquid-phase composite oxidant: sodium persulfate concentration of 10% wt, pH of 5.

[0075] Liquid phase absorbent: potassium chloride concentration is 5% wt, pH is 7.

[0076] The reaction conditions of the microwave-coupled ultraviolet photocatalytic oxidative desulfurization and denitrification system are shown in Table 3.

[0077] Table 3 Reaction conditions

[0078] condition scope Microwave set temperature 50℃ Microwave setting power 300W Mercury generator water bath temperature 60℃ Photocatalyst Reactor Energy Density 300KW / m 3

[0079] Purify the flue gas according to the above conditions, and it is detected that the mercury removal efficiency reaches 94%.

Embodiment 3

[0081] Liquid-phase composite oxidant: hydrogen peroxide concentration is 10% wt, pH is 6.

[0082] Liquid phase absorbent: potassium chloride concentration is 5% wt, pH is 7.

[0083] The reaction conditions of the microwave-coupled ultraviolet photocatalytic oxidative desulfurization and denitrification system are shown in Table 4.

[0084] Table 4 Reaction conditions

[0085] condition scope Microwave set temperature 50℃ Microwave setting power 300W Mercury generator water bath temperature 60℃ Photocatalyst Reactor Energy Density 300KW / m 3

[0086] Purify the flue gas according to the above conditions, and it is detected that the mercury removal efficiency reaches 93%.

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Abstract

The invention discloses a microwave-coupled ultraviolet photocatalytic oxidation of Hg, which belongs to the technical field of flue gas purification 0 Purification system and method. The microwave-coupled ultraviolet photocatalytic oxidation of Hg 0 The purification system includes a microwave generator, an electrodeless lamp, a photocatalytic reactor and a subsequent absorption device. First, the nitrogen carrier gas enters the mercury generator, and the water bath vaporizes the solid mercury, and the Hg 0 The steam enters the microwave reactor, the microwave heats and excites the electrodeless lamp, and the liquid oxidant is catalytically activated in the photocatalytic reactor, and the highly active free radicals generated are harmful to Hg 0 to oxidize. The generated oxidized mercury enters the subsequent absorption system to be absorbed, and finally the mercury-removed gas is discharged. The present invention realizes the Hg in the coal-fired flue gas 0 The high-efficiency oxidation of the existing mercury removal oxidation equipment is highly integrated and improved, and can solve the problem of Hg in the existing flue gas pollutants. 0 Difficult to oxidize and remove, large floor space and high operating costs.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification, in particular to a microwave-coupled ultraviolet photocatalytic oxidation of Hg 0 Purification system and method. Background technique [0002] Anthropogenic release of mercury into the atmosphere has become an important environmental issue. The methylmercury produced by the transformation of anthropogenic mercury has great toxicity, persistence, and bioaccumulation, and thus has attracted the attention of various countries. China's current main source of electricity is provided by coal-fired power plants, but the flue gas produced by coal-fired power plants will contain a lot of harmful substances such as SO 2 , NO, Hg 0 etc., therefore, the Chinese government has promulgated the "Emission Standard of Air Pollutants for Thermal Power Plants" (GB 13223-2011) to reduce NO x , SO 2 , and Hg 0 emissions. Among them, mercury, as a heavy metal, will cause considerable toxicity to t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/86B01D53/64
CPCB01D53/8665B01D2251/106B01D2251/108B01D2255/802B01D2257/602
Inventor 郝润龙王铮巩亚萍
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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