A device and method for removing zero-valent mercury in flue gas by in-situ discharge activation oxidation

A zero-valent mercury and flue gas technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve a large number of problems, increase the cost of mercury removal, increase the risk of secondary pollution, etc., and achieve low cost and increase. Equipment cost and the effect of less usage

Active Publication Date: 2015-09-09
SHANGHAI JIAOTONG UNIV
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Problems solved by technology

However, the direct use method requires a large amount of oxidizing agents, such as bromine, iodine, etc.
Since these oxidants are not inherent components in the flue gas, the use of a large amount of oxidants not only increases the cost of mercury removal, but also increases the risk of secondary pollution
Moreover, the reaction rate between the oxidant and zero-valent mercury found in the current study still needs to be improved.

Method used

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  • A device and method for removing zero-valent mercury in flue gas by in-situ discharge activation oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In this embodiment, a square stainless steel device is used as a simulated flue, and the length, width, and height of the flue are 2000 mm, 400 mm, and 400 mm, respectively. An air heating device is installed in the upstream of the flue, and the hot simulated flue gas ([NO]=200ppm, [Hg 0 ] = 20μg / m 3 , [SO 2 ]=1000ppm, the rest is hot air at 150℃ heated by electric furnace) at 100m 3 The flow rate of / h is continuously passed into the flue. A row of five corona discharge devices is arranged horizontally on the side center line of the flue. The diameter of the corona discharge devices is 100 mm, and the distance between the centers of the corona discharge devices is 400 mm. The main body of the corona discharge device is made of ceramic tube, the thickness of the ceramic tube wall is 0.5mm, the structure of the discharge electrode is single needle, and the grounding pole is a stainless steel filter mesh sleeve, which is wrapped on the outer surface of the main body of...

Embodiment 2

[0040] The device and method are the same as in Example 1, except that the mercury removal agent is changed to gaseous hydrogen bromide, and after hydrogen bromide is sprayed into the flue gas, the concentration in the simulated flue gas is 2ppmv. When no voltage is applied, the removal efficiency of zero-valent mercury in flue gas is 40%; gradually adjust the voltage to 8.0kV, the removal efficiency of zero-valent mercury reaches about 75%; further adjust the voltage to 9.0kV, zero-valent mercury The removal efficiency of mercury reached about 90%.

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Abstract

The invention relates to an apparatus and a method for removal of zero valent mercury in flue gas through on-site discharge activation oxidation. The method utilizes a corona discharge assembly to carry out on-site activation on a mercury-removal agent in a flue, so as to generate a lot of active substances and increase oxidation rate of the mercury-removal agent on the zero valent mercury in the flue gas, thereby rapidly and effectively removing the zero valent mercury in the flue gas. The method is as below: disposing the corona discharge assembly comprising a porous ceramic pipe and electrodes in the flue, and generating a lot of active substances through corona discharge; then sending the active substances into the flue through micropore channels on a wall surface of the ceramic tube by using the pressure difference between the corona discharge assembly and the flue, reacting the active substances with zero valent mercury in the flue gas, so as to converse the zero valent mercury into divalent mercury; and finally removing the divalent mercury by a wet method desulphurization apparatus. The above method can effectively remove zero valent mercury in the flue gas and save the usage amount of the mercury-removal agent.

Description

technical field [0001] The invention belongs to the flue gas mercury emission control technology in the field of environmental protection. It mainly uses a corona discharge device to activate the mercury removal agent in situ to generate a large amount of active substances, and then through the reaction of these active substances with zero-valent mercury in the flue gas, the It is converted into divalent mercury, and finally the divalent mercury is absorbed by the wet desulfurization device to achieve the purpose of mercury removal from flue gas. Background technique [0002] As a toxic and harmful pollutant, mercury has been recognized more and more. In 2013, United Nations intergovernmental negotiations culminated in the adoption of a legally binding international convention on mercury. The international community's attention to mercury pollution discharge and control has reached a new level. Among the many sources of mercury emissions, mercury emissions from coal combus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/76B01D53/64
Inventor 瞿赞晏乃强徐浩淼潘杰马步宇
Owner SHANGHAI JIAOTONG UNIV
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