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A method for desulfurization, denitrification and demercuration of ozone combined with light radiation peroxide

A technology for desulfurization, denitrification, mercury removal and peroxide, which is applied in the field of desulfurization, denitrification and demercury removal of ozone combined with light radiation peroxide, can solve the problems of large area, complex system, increased initial investment and operating costs, and achieve high efficiency. The effect of removal and broad application prospects

Inactive Publication Date: 2019-12-31
CHANGSHU CITY YUHENG KNITTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these two methods can desulfurize and denitrify independently, they cannot achieve simultaneous desulfurization and denitrification in a spray bed.
Although the superimposed use of the two processes can achieve simultaneous desulfurization and denitrification, the whole system is complicated, occupies a large area, and has high investment and operating costs.
In addition, with the continuous improvement of human requirements for environmental protection, laws and regulations for the control of mercury emissions in flue gas have gradually been introduced, but currently there is no economical and effective flue gas mercury removal technology that has achieved large-scale commercial application
If a separate flue gas mercury removal system is added at the end of the existing desulfurization and denitrification system, it will inevitably cause a further increase in the initial investment and operating costs of the entire system, and ultimately it will be difficult to obtain large-scale commercial applications in developing countries

Method used

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  • A method for desulfurization, denitrification and demercuration of ozone combined with light radiation peroxide
  • A method for desulfurization, denitrification and demercuration of ozone combined with light radiation peroxide
  • A method for desulfurization, denitrification and demercuration of ozone combined with light radiation peroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Example 1. SO in flue gas 2 ﹑NO x with Hg 0 Concentrations are 6000ppm, 800ppm and 60μg / m 3 , the flue gas inlet temperature of the upper and lower opposite spray bed is 60℃, and the liquid-gas ratio is 0.5L / m 3 , the concentration of hydrogen peroxide is 0.5mol / L, the pH of the solution is 3.5, the temperature of the solution is 50°C, and the effective radiation intensity of ultraviolet light is 25μW / cm 2 , The effective wavelength of ultraviolet light is 254nm. The results of the small test are: SO in flue gas 2 ﹑NO x with Hg 0 The simultaneous removal efficiencies can reach 100%, 50.6% and 63.2%, respectively.

Embodiment 2

[0056] Example 2. SO in flue gas 2 ﹑NO x with Hg 0 Concentrations are 6000ppm, 800ppm and 60μg / m 3 , the flue gas inlet temperature of the upper and lower opposite spray bed is 60℃, and the liquid-gas ratio is 0.5L / m 3 , the concentration of ammonium persulfate is 0.5mol / L, the pH of the solution is 3.5, the temperature of the solution is 50°C, and the effective radiation intensity of ultraviolet light is 25μW / cm 2 , The effective wavelength of ultraviolet light is 254nm. The results of the small test are: SO in flue gas 2 ﹑NO x with Hg 0 The simultaneous removal efficiencies can reach 100%, 45.7% and 58.1%, respectively.

Embodiment 3

[0057] Example 3. SO in flue gas 2 ﹑NO x with Hg 0 Concentrations are 6000ppm, 400ppm and 50μg / m 3 , the flue gas inlet temperature of the upper and lower opposite spray bed is 60℃, and the liquid-gas ratio is 0.5L / m 3 , the concentration of hydrogen peroxide is 0.5mol / L, the pH of the solution is 3.5, the temperature of the solution is 50°C, and the effective radiation intensity of ultraviolet light is 25μW / cm 2 , The effective wavelength of ultraviolet light is 254nm. The results of the small test are: SO in flue gas 2 ﹑NO x with Hg 0 The simultaneous removal efficiencies can reach 100%, 71.5% and 83.3%, respectively.

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Abstract

The invention relates to a method for realizing desulfuration, denitration and demercuration through the combination of ozone and radiated peroxides. The method comprises the following steps: SO2, NO and Hg<0> from a discharging source are pre-oxidized by ozone in a flue and are transformed into SO3, NO2 and Hg<2+>; ultraviolet lamps radiate ultraviolet light, the ultraviolet light stimulates peroxides to generate sulfate radicals and hydroxyl radicals so as to further oxidize SO2, NO and Hg<0>, and SO3 and NO2 which are generated through oxidation of ozone, wherein the reaction products are mainly sulfuric acid, nitric acid and divalent mercury ions, which can be used as resources. Devices for realizing the method mainly comprise the discharging source, a blower, a dust remover, a fume cooler, an ozone generator, a longitudinal opposite-spraying atomization bed, circulating pumps (I and II), a filler layer, ultraviolet lamp tubes, atomizing nozzles, a demister, a liquid tank and an after-treatment system of reaction products. A novel fume purifying system adopted by the method can efficiently remove the SO2, the NO and the Hg<0> in the fume, the process of removal does not generate secondary pollution, so that the novel fume purifying system has an extensive application prospect.

Description

technical field [0001] The invention relates to the field of air pollution control, in particular to a method for desulfurization, denitration and demercuration of ozone combined with light radiation peroxide. Background technique [0002] SO produced during combustion 2 ﹑NO x And Hg can cause acid rain, photochemical smog and carcinogenic and other serious air pollution problems, endangering human health and ecological balance. In the past few decades, although people have developed a large number of flue gas desulfurization, denitrification and demercury technologies, the existing desulfurization, denitrification and demercuration technologies only aimed at the removal of a single pollutant at the beginning of research and development, and could not achieve multi-pollutant removal. removed at the same time. [0003] For example, the currently widely used flue gas desulfurization and denitrification technologies are mainly limestone-gypsum wet flue gas desulfurization te...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/75B01D53/79B01D53/60B01D53/64
CPCY02A50/20
Inventor 刘杨先张军郝建刚张永春
Owner CHANGSHU CITY YUHENG KNITTING