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Method and system for removing mercury through free radicals generated based on ozone/hydrogen peroxide

A technology of hydrogen peroxide and free radicals, which is applied in chemical instruments and methods, separation methods, and separation of dispersed particles, etc. It can solve the problems of affecting the effective radiation distance of ultraviolet light, deteriorating the long-term operating efficiency of the system, and short penetration distance of ultraviolet light. , to achieve the effects of no secondary pollution, reduced sewage discharge, and efficient removal

Inactive Publication Date: 2014-08-20
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the above methods can achieve a certain effect of mercury removal, due to the extremely short penetration distance of ultraviolet light, especially the actual coal-fired flue gas contains a large amount of particulate matter, it will seriously affect the effective radiation distance of ultraviolet light
In addition, after long-term use, a large amount of dirt will be deposited on the surface of the UV lamp, which will deteriorate the long-term operating efficiency of the system, and may even cause the system to fail
[0007] In summary, there is currently no coal-fired flue gas mercury removal technology suitable for large-scale commercialization.

Method used

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  • Method and system for removing mercury through free radicals generated based on ozone/hydrogen peroxide
  • Method and system for removing mercury through free radicals generated based on ozone/hydrogen peroxide

Examples

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Effect test

Embodiment 1

[0033] Example 1. Hg in flue gas 0 The concentration is 50 μg / m3, the flue gas temperature is 50°C, the molar concentration of hydrogen peroxide is 1.5mol / L, the ozone injection concentration is 100ppm, and the liquid-gas ratio is 10L / m 3 , the distance between the ozone injection port and the flue gas inlet of the reactor is 50cm. Hg in flue gas 0 The removal efficiency is 89.9%.

Embodiment 2

[0034] Example 2. Hg in flue gas 0 The concentration is 50 μg / m3, the flue gas temperature is 70°C, the molar concentration of hydrogen peroxide is 1.5mol / L, the ozone injection concentration is 100ppm, and the liquid-gas ratio is 10L / m 3 , the distance between the ozone injection port and the flue gas inlet of the reactor is 50cm. Hg in flue gas 0 The removal efficiency is 81.2%.

Embodiment 3

[0035] Example 3. Hg in flue gas 0 The concentration is 100 μg / m3, the flue gas temperature is 50°C, the molar concentration of hydrogen peroxide is 1.5mol / L, the ozone injection concentration is 100ppm, and the liquid-gas ratio is 10L / m 3 , the distance between the ozone injection port and the flue gas inlet of the reactor is 50cm. Hg in flue gas 0 The removal efficiency is 84.1%.

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Abstract

The invention discloses a method and a system for removing mercury through free radicals generated based on ozone / hydrogen peroxide. The method comprises the following steps that smoke exhausted by a combustor firstly passes through a smoke heat exchanger to be adjusted in temperature and then is introduced into a liquid phase reaction region of a reactor; ozone is injected into the smoke at a reactor inlet flue by an ozone injector; the ozone in the smoke contacts with hydrogen peroxide in a solution in a liquid phase reaction region to generate hydroxyl radicals to oxidize and remove an elementary substance mercury in the smoke, wherein a reactant is divalent mercury easily dissolving in water; after entering a primary mercury separation tower, a reaction solution generates a mercuric sulfide precipitate through reaction by adding sulfide and then is kept to be introduced into a secondary mercury separation tower for precipitation and separation. The method is capable of efficiently removing the elementary mercury in the smoke; equipment is simple and reliable, and free from secondary pollution in a removing process, thus the method and the system are novel smoke purifying method and system with wide application prospect.

Description

technical field [0001] The invention relates to the field of combustion flue gas pollutant control, in particular to a method and system for removing mercury by free radicals generated by ozone / hydrogen peroxide. Background technique [0002] Mercury is a highly toxic heavy metal trace element, which is extremely harmful to human health and the ecological environment. my country is the world's largest coal consumer, and the proportion of coal in the energy structure is as high as 75%, and this pattern will not change significantly for a long period of time in the future. With the increasingly stringent air environmental protection standards for coal-fired pollutants, it is expected that the release of mercury pollution control standards for coal-fired flue gas will be an inevitable trend in the near future. [0003] Scholars at home and abroad have done a lot of fruitful work in the field of research on new theories and technologies of mercury removal. At present, among ma...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/64
Inventor 刘杨先王燕张军吴东波
Owner JIANGSU UNIV
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