Heterogeneous-Photo-Fenton-based integrated smoke gas purification system

A flue gas purification system, heterogeneous technology, applied in air quality improvement, chemical instruments and methods, separation of dispersed particles, etc., can solve the problems of increased absorption and mass transfer resistance, low denitrification and mercury removal efficiency, and inability to achieve desulfurization, denitrification and denitrification Mercury and other problems, to achieve strong oxidation capacity, reduce initial investment and operating costs, easy to separate and regenerate the effect of recycling

Inactive Publication Date: 2011-08-31
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Wet flue gas purification technology is a traditional flue gas treatment technology. It has the characteristics of small initial investment, simple process flow and easy removal of multiple pollutants at the same time. It is a very promising flue gas purification technology for development and application. , but the research progress of traditional wet flue gas purification technology has been relatively slow, the main reason is that nitrogen oxides and mercury elements contain more than 90% insoluble NO and 40-80% insoluble Hg 0
According to the double-membrane theory, the gas-phase molecules must first dissolve into the liquid phase through mass transfer and diffusion processes from the gas state, and then they can undergo chemical reactions and be fixed in the absorption liquid, while NO and Hg 0 The insoluble characteristics greatly increase the absorption and mass transfer resistance in the liquid phase, and it is difficult to significantly increase the NO and Hg levels only by adjusting the pH and temperature of the absorption liquid. 0 Solubility in the liquid phase, this characteristic has caused the traditional wet desulfurization, denitrification and mercury removal technology to generally have high desulfurization efficiency, but low denitrification and mercury removal efficiency, etc. In fact, it is impossible to achieve real simultaneous desulfurization, denitrification and mercury removal

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  • Heterogeneous-Photo-Fenton-based integrated smoke gas purification system

Examples

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Effect test

Embodiment 1

[0040] Example 1. SO in flue gas 2 , NO and Hg 0 Concentrations are 2000ppm, 500ppm and 100ug / m 3 , the solid catalyst is Fe 2 o 3 Particles (mass concentration of 1.0g / L, particle size of 100 mesh), flue gas temperature of 25°C, UV wavelength of 254nm, UV radiation intensity of 100W / m 3 , the molar concentration of hydrogen peroxide is 1.0mol / L, and the liquid-gas ratio is 20L / m 3 , when the effective residence time is 10s, the spacing b of the UV lamps and the central angle a are 10cm and 25 degrees respectively, the SO in the flue gas 2 , NO and Hg 0 The integrated removal efficiencies can reach 92.1%, 80.9% and 98.8%, respectively.

Embodiment 2

[0041] Example 2. SO in flue gas 2 , NO and Hg 0 Concentrations are 2000ppm, 500ppm and 100ug / m 3 , the solid catalyst is Fe 2 o 3 Particles (mass concentration is 1.0g / L, particle size is 100 mesh), flue gas temperature is 25°C, ultraviolet light wavelength is 254nm, UV radiation intensity is 150W / m 3 , the molar concentration of hydrogen peroxide is 1.0mol / L, and the liquid-gas ratio is 20L / m 3 , when the effective residence time is 10s, the spacing b of the UV lamps and the central angle a are 10cm and 25 degrees respectively, the SO in the flue gas 2 , NO and Hg 0 The integrated removal efficiencies can reach 100%, 92.2% and 100%, respectively.

Embodiment 3

[0042] Example 3. SO in flue gas 2 , NO and Hg 0 Concentrations are 2000ppm, 500ppm and 100ug / m 3 , the solid catalyst is Fe 2 o 3Particles (mass concentration of 1.0g / L, particle size of 100 mesh), flue gas temperature of 25°C, UV wavelength of 254nm, UV radiation intensity of 100W / m 3 , the molar concentration of hydrogen peroxide is 1.0mol / L, and the liquid-gas ratio is 20L / m 3 , when the effective residence time is 10s, the spacing b of the UV lamps and the central angle a are 10cm and 25 degrees respectively, the SO in the flue gas 2 , NO and Hg 0 The integrated removal efficiencies can reach 89.2%, 83.2% and 100%, respectively.

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Abstract

The invention discloses a heterogeneous-Photo-Fenton-based integrated smoke gas purification system. The smoke gas purification system generates a hydroxyl radical (.OH) with strong oxidizability by using heterogeneous Photo-Fenton to oxidize SO2, NO and Hg0 in the smoke gas into H2SO4, HNO3 and Hg2<+> respectively, wherein the H2SO4, the HNO3 and the Hg2<+> are fixed in solution; after reaction,a solid catalyst in mixed solution can be recycled through simple primary precipitation separation; a small amount of Hg2<+> in the solution can be generated into insoluble HgS by adding the same mole ratio of S2<->, and then the HgS is recycled through secondary precipitation separation; and the remaining sulfuric acid and nitric acid solution can be used as an industrial raw material to be further recycled. The whole integrated desulfuration, denitration and demercuration processes generate no secondary pollution, so the heterogeneous-Photo-Fenton-based integrated smoke gas purification system has a very good application prospect.

Description

technical field [0001] The invention relates to the control of flue gas emission pollutants in the combustion process, in particular to an integrated flue gas purification system based on heterogeneous Photo-Fenton. Background technique [0002] Sulfur oxides, nitrogen oxides, and mercury produced during combustion can cause serious hazards such as acid rain, photochemical smog, and carcinogenicity and teratogenicity. Therefore, developing effective methods for flue gas desulfurization, denitrification and mercury removal is one of the important tasks of environmental protection scientists and technicians in various countries. In recent years, although people have developed a large number of flue gas desulfurization, denitrification and demercury technologies, due to the limitations of human understanding and the gradual development of science and technology, the existing desulfurization, denitration and demercury technologies were only developed for a single Pollutants are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/78B01D53/60B01D53/64
CPCY02A50/20
Inventor 张军刘杨先盛昌栋张永春赵亮丁启忠
Owner SOUTHEAST UNIV
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