System and method for desulfurizing, denitrifying and removing mercury based on photoactivation ammonium persulfate

A technology for desulfurization, denitrification, mercury removal, and ammonium persulfate, which is applied in the field of flue gas emission pollutant control, can solve the problems of low denitrification and mercury removal efficiency, high desulfurization efficiency, and slow progress in wet flue gas purification technology research. Effect of reducing initial investment and operating costs

Active Publication Date: 2014-03-19
JIANGSU 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 flue gas purification technology with good development and application prospects. , but the research progress of traditional wet flue gas purification technology has been relatively slow, the main reason is that flue gas 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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  • System and method for desulfurizing, denitrifying and removing mercury based on photoactivation ammonium persulfate
  • System and method for desulfurizing, denitrifying and removing mercury based on photoactivation ammonium persulfate
  • System and method for desulfurizing, denitrifying and removing mercury based on photoactivation ammonium persulfate

Examples

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Effect test

Embodiment 1

[0047] Example 1. SO in flue gas 2 ﹑NO x with Hg 0 Concentrations are 2000ppm, 400ppm and 50ug / m 3 , the flue gas temperature is 55°C, the wavelength of ultraviolet light is 254nm, and the intensity of UV radiation is 20μW / cm 2 , the molar concentration of ammonium persulfate is 1.5mol / L, and the liquid-gas ratio is 15L / m 3 , the length of the ultraviolet lamp is 40cm, the distance between the ultraviolet lamps is 20cm, the vertical distance between the nozzles is 20cm, the horizontal distance between the nozzles is also 20cm, and the atomization angle of the nozzles is 45 degrees. The test results on a small experimental system are: SO in flue gas 2 ﹑NO x with Hg 0 The simultaneous removal efficiencies can reach 99.1%, 80.9% and 98.8%, respectively.

Embodiment 2

[0048] Example 2. SO in flue gas 2 ﹑NO x with Hg 0 Concentrations are 3000ppm, 600ppm and 100ug / m 3 , the flue gas temperature is 35°C, the wavelength of ultraviolet light is 254nm, and the intensity of UV radiation is 20μW / cm 2 , the molar concentration of ammonium persulfate is 1.5mol / L, and the liquid-gas ratio is 5L / m 3 , the length of the ultraviolet lamp is 40cm, the distance between the ultraviolet lamps is 20cm, the vertical distance between the nozzles is 20cm, the horizontal distance between the nozzles is also 20cm, and the atomization angle of the nozzles is 45 degrees. The test results on a small experimental system are: SO in flue gas 2 ﹑NO x with Hg 0 The simultaneous removal efficiencies can reach 98.1%, 70.9% and 88.2%, respectively.

Embodiment 3

[0049] Example 3. SO in flue gas 2 ﹑NO x with Hg 0 Concentrations are 1500ppm, 800ppm and 100ug / m 3 , the flue gas temperature is 65°C, the wavelength of ultraviolet light is 254nm, and the intensity of UV radiation is 10μW / cm 2 , the molar concentration of ammonium persulfate is 1.5mol / L, and the liquid-gas ratio is 5L / m 3 , the length of the ultraviolet lamp is 40cm, the distance between the ultraviolet lamps is 20cm, the vertical distance between the nozzles is 20cm, the horizontal distance between the nozzles is also 20cm, and the atomization angle of the nozzles is 45 degrees. The test results on a small experimental system are: SO in flue gas 2 ﹑NO x with Hg 0 The simultaneous removal efficiencies can reach 96.1%, 75.9% and 89.2%, respectively.

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Abstract

The invention discloses a system and a method for desulfurizing, denitrifying and removing mercury based on photoactivation ammonium persulfate. The system is mainly provided with a boiler or kiln, a deduster, a flue gas temperature regulator, a photochemistry reactor, a liquid spraying system as well as a byproduct post-processing system. Flue gas discharged from the boiler or kiln enters the photochemistry reactor arranged on a flue channel after being subjected to dedusting and temperature regulation, and an ammonium persulfate solution from the liquid spraying system is sprayed into the photochemistry reactor in a mist form; an UV (ultraviolet) lamp in the photochemistry reactor emits UV light to perform catalytic decomposition on ammonium persulfate, releases sulfate radical free radicals with high oxidizing property (SO4-.), and meanwhile oxidizes and removes SO2, NOx and mercury in the flue gas. Oxidized products are subjected to resource utilization after being processed by the byproduct post-processing system. The method has the prominent advantages that the method can be used for removing multiple pollutants in coal burned flue gas synchronously, has no secondary pollution during removing, and can be used for transforming aging units and the like, and the system is a novel flue gas purifying system with a wide application prospect.

Description

technical field [0001] The invention relates to the control of flue gas emission pollutants, in particular to a system and method for desulfurization, denitrification and mercury removal based on photoactivated ammonium persulfate. Background technique [0002] Sulfur oxides, nitrogen oxides, and mercury produced in the combustion process of industrial production can cause acid rain, photochemical smog, and even cause serious hazards such as 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 t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/76B01D53/78B01D53/60B01D53/64
CPCY02A50/20
Inventor 刘杨先张军潘剑锋
Owner JIANGSU UNIV
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