Method and device for removing mercury from ammonia desulfurization slurry

An ammonia desulfurization and mercury removal technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve problems such as inability to achieve mercury removal, increase sewage treatment costs, inhibit re-release, and the method is simple and easy to implement Effect

Active Publication Date: 2019-08-02
JIANGSU NEW CENTURY JIANGNAN ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the fact that the ammonia desulfurization slurry obtained after the flue gas ammonia desulfurization process does not have a separate mercury removal step, and mercury will accumulate in the absorption system; Reduction, will reduce divalent mercury to zero-valent mercury, return to the flue gas, can not achieve the purpose of mercury removal defect, provides a method and device for ammonia desulfurization slurry mercury removal

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  • Method and device for removing mercury from ammonia desulfurization slurry

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Embodiment 1

[0054] The process of obtaining the ammonia desulfurization slurry in this embodiment is as follows: using an improved selective catalytic reduction (SCR) catalyst containing metal oxides such as vanadium, tungsten, and titanium, which can catalyze the oxidation of elemental mercury, and the oxidation efficiency is greater than 85%. The oxidized divalent mercury enters the rear ammonia desulfurization absorption tower with the flue gas, and after being fully absorbed by the desulfurization circulating fluid, the divalent mercury in the flue gas enters the ammonia desulfurization slurry.

[0055] The ammoniacal desulfurization slurry in this embodiment is ammonium sulfate slurry with a mass fraction of 1%, and the concentration of divalent mercury in the ammoniacal ammonium sulfate slurry is 50 μg / L.

[0056] A mercury removal agent is added into the ammonium sulfate slurry, the mercury removal agent is composed of ammonium sulfide, the reaction temperature is 45-55° C., and the...

Embodiment 2

[0062] The process of obtaining the ammonia desulfurization slurry in this embodiment is as follows: using an improved selective catalytic reduction (SCR) catalyst containing metal oxides such as vanadium, tungsten, and titanium, which can catalyze the oxidation of elemental mercury, and the oxidation efficiency is greater than 90%. The oxidized divalent mercury enters the rear ammonia desulfurization absorption tower with the flue gas, and after being fully absorbed by the desulfurization circulating fluid, the divalent mercury in the flue gas enters the ammonia desulfurization slurry.

[0063] The ammonia desulfurization slurry in this embodiment is ammonium sulfate slurry with a mass fraction of 1%. The concentration of divalent mercury in the ammonium sulfate slurry is 150 μg / L. A mercury removal agent is added to the ammonium sulfate slurry. The mercury removal agent is composed of: sulfur Ammonium sulfosulfate, the reaction temperature is 46-55°C, and the pH of the reacti...

Embodiment 3

[0068] The process of obtaining the ammonia desulfurization slurry in this embodiment is as follows: using an improved selective catalytic reduction (SCR) catalyst containing metal oxides such as vanadium, tungsten, and titanium, which can catalyze the oxidation of elemental mercury, and the oxidation efficiency is greater than 90%. The oxidized divalent mercury enters the rear ammonia desulfurization absorption tower with the flue gas, and after being fully absorbed by the desulfurization circulating fluid, the divalent mercury in the flue gas enters the ammonia desulfurization slurry.

[0069] The ammonia desulfurization slurry in this embodiment is ammonium sulfate slurry with a mass fraction of 2%. The concentration of divalent mercury in the ammonium sulfate slurry is 500 μg / L. A mercury removal agent is added to the ammonium sulfate slurry. The mercury removal agent is composed of: A mixture of ammonium and ammonium thiosulfate, the reaction temperature is 50-55°C, and th...

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Abstract

The present invention discloses a mercury removal method and a mercury removal device for ammonia desulfurization slurry. The method includes the following steps: (1) mixing the ammonia desulfurization slurry with a mercury removal agent, carrying out a reaction, and performing first solid-liquid separation to obtain a first supernatant and a solid precipitate; and (2) mixing the obtained first supernatant in the step (1) with ammonium sulfite, carrying out a reaction, and performing second solid-liquid separation to obtain a second supernatant and a precipitate. The invention provides a device which includes a mercury removal reaction tank, a mercury removal agent removal tank, a return pump, an ash removing device, a first discharge pump and a second discharge pump. The method provided by the invention achieves good mercury removal effects, and yields products with high quality. Equipment is simple, and the method is suitable for industrial promotion.

Description

technical field [0001] The invention relates to a method and a device for removing mercury from ammonia desulfurization slurry. Background technique [0002] As a highly toxic and highly volatile substance, mercury can enter the human body through the digestive tract, respiratory tract and skin absorption, and deposit in the body to cause disease and cancer. It has received more and more attention in the field of environmental protection. Combustion of fossil fuels is the largest source of mercury emissions from human activities. A large amount of mercury pollutes water bodies through dry deposition or wet deposition, and after being enriched in fish and other organisms, it circulates into the human body, which is extremely harmful. The average mercury content in coal in my country is about 0.19-1.95 μg / g, which is 0.02-1 μg / g higher than the world average. It is estimated that China released 609 tons of mercury into the atmosphere in 2003. [0003] At present, there are t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/80B01D53/64B01D53/50B01D53/86B01D53/48B01D53/14
CPCB01D53/14B01D53/48B01D53/50B01D53/64B01D53/80B01D53/8665B01D2251/608B01D2255/20707B01D2255/20723B01D2255/20776B01D2258/0283
Inventor 张军朱继保谭强
Owner JIANGSU NEW CENTURY JIANGNAN ENVIRONMENTAL PROTECTION
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