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Method for simultaneous desulfurization-denitrification-demercuration based on combination of free radical pre-oxidation and wet absorption

A technology for desulfurization, denitrification, mercury removal, and pre-oxidation, which is applied in chemical instruments and methods, separation methods, and dispersed particle separation, etc., and can solve the problems of high investment and operating costs, large floor space, and complex systems.

Active Publication Date: 2015-07-29
苏州弗兰特环保科技有限公司
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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 removal in one reactor.
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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  • Method for simultaneous desulfurization-denitrification-demercuration based on combination of free radical pre-oxidation and wet absorption
  • Method for simultaneous desulfurization-denitrification-demercuration based on combination of free radical pre-oxidation and wet absorption
  • Method for simultaneous desulfurization-denitrification-demercuration based on combination of free radical pre-oxidation and wet absorption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Example 1. SO in flue gas 2 ﹑NO x with Hg 0 Concentrations are 2000ppm, 400ppm and 50μg / m 3 , the flue gas inlet temperature of the impingement bed is 100°C, and the liquid-gas ratio is 0.5L / m 3 , the dosage of iron oxide is 0.1kg / m 3 , the concentration of hydrogen peroxide is 0.5mol / L, the pH of the solution is 3.4, the temperature of the solution is 70°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 88.2%, 62.5% and 71.2%, respectively.

Embodiment 2

[0056] Example 2. SO in flue gas 2 ﹑NO x with Hg 0 Concentrations are 2000ppm, 400ppm and 50μg / m 3 , the flue gas inlet temperature of the impingement bed is 100°C, and the liquid-gas ratio is 0.5L / m 3 , the dosage of iron oxide is 0.1kg / m 3 , the concentration of ammonium persulfate is 0.5mol / L, the pH of the solution is 3.4, the temperature of the solution is 70°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 86.2%, 60.1% and 68.5%, respectively.

Embodiment 3

[0057] Example 3. SO in flue gas 2 ﹑NO x with Hg 0 Concentrations are 2000ppm, 400ppm and 50μg / m 3 , the flue gas inlet temperature of the impingement bed is 100°C, and the liquid-gas ratio is 0.5L / m 3 , the dosage of iron oxide is 0.1kg / m 3 , the concentration of hydrogen peroxide is 1.0mol / L, the pH of the solution is 3.4, the temperature of the solution is 70°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 95.8%, 73.6% and 83.7%, respectively.

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Abstract

The invention relates to a system for simultaneous desulfurization-denitrification-demercuration based on a combination of free radical pre-oxidation and wet absorption. The system adopts the structure that ultraviolet light and a catalyst are combined to decompose a peroxide; during decomposition, strong oxidative hydroxy or sulfate radical free radical are generated for oxidative removal of SO2, NOx and Hg0 in an impact bed; part of flue gas from an emission source and part of catalyst particles are mixed and sprayed into the impact bed through high-speed nozzles, and the other part of flue gas and catalyst particle are mixed and sprayed into the impact bed through the high-speed nozzles which are coaxially arranged in an opposite manner; meanwhile, a peroxide solution is sprayed into the impact bed through sprayers, so that such three gas steams are subjected to impact and mixing in the impact bed. The system has the advantages that the ultraviolet light and the catalyst are combined to decompose the peroxide, strong oxidative hydroxy or sulfate radical free radical are generated for oxidation of SO2, NOx and Hg0, so that gas-sate divalent mercury, nitrogen dioxide, sulfur trioxide, sulfuric acid and nitric acid are generated, and then SO2, NOx and Hg0 are removed in a wet desulfurization system at the tail part. Therefore, the system provided by the invention can be used for transforming the conventional coal burning boiler to achieve sulfur-nitrogen-mercury integrated removal, and has a broad market application prospect.

Description

technical field [0001] The invention relates to the field of combustion flue gas pollutant control, in particular to a simultaneous desulfurization, denitrification and mercury removal method based on free radical pre-oxidation combined with wet absorption. 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. For example, the currently widely used flue gas desulfurization and denitrification technologies are mainly limestone...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/60B01D53/64
CPCY02A50/20
Inventor 刘杨先张军阮小娇刘勇
Owner 苏州弗兰特环保科技有限公司
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