Flue gas mercury removing method

A technology for flue gas and mercury removal agent, applied in the field of mercury removal from flue gas, can solve problems such as the adverse effect of hydrogen sulfide on the conversion process of sulfuric acid system, and achieve the effect of avoiding negative effects and excessive concentration

Active Publication Date: 2018-11-27
CHINA ENFI ENGINEERING CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0029] The main purpose of the present invention is to provide a method for removing mercury from flue gas, so as to solve the problem in the prior art that usin...

Method used

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  • Flue gas mercury removing method
  • Flue gas mercury removing method
  • Flue gas mercury removing method

Examples

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Embodiment 1

[0071] The mercury removal method that the present embodiment provides comprises the following steps:

[0072] Elemental mercury in flue gas 80mg / Nm 3 , the moisture in the flue gas is close to saturation, and the composite mercury removal agent uses Na 2 S and Na 2 S 2 o 3 And configure it with water to form a mixed solution. The mass concentration of the composite mercury removal agent in the solution is 4%. A high-pressure injector is installed in the mercury removal reactor to feed the flue gas into the reactor with a flow rate of 1.5m / s. The composite mercury removal agent is sprayed through a high-pressure injector and contacts with the flue gas downstream, the injection pressure is 0.2MPa, and the reaction temperature of flue gas mercury removal is 23°C.

Embodiment 2

[0074] The difference between the mercury removal method provided by this embodiment and embodiment 1 is:

[0075] The mass concentration of the composite mercury removal agent in the mixed solution containing the composite mercury removal agent is 5%.

Embodiment 3

[0077] The difference between the mercury removal method provided by this embodiment and embodiment 1 is:

[0078] The mass concentration of the composite mercury removal agent in the mixed solution containing the composite mercury removal agent is 25%.

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Abstract

The invention provides a flue gas mercury removing method. The flue gas mercury removing method comprises the following steps of performing mercury removal, during which mercury remover reacts with sulfur dioxide inside the flue gas into produce elemental sulfur which is applied to processing mercury contained in the flue gas. The mercury remover reacts with the sulfur dioxide inside the flue gasto produce the high-dispersion and high-activity elemental sulfur, which can effectively react with the sulfur dioxide inside the flue gas into mercury sulfide and accordingly remove the mercury out of a system, and also, unreacted superfluous elemental sulfur can be discharged out of the system along with the mercury sulfide. Therefore, the flue gas mercury removing method can achieve mercury removal of the flue gas, and with the superfluous elemental sulfur, can avoid excessive concentration of hydrogen sulfide and further avoid adverse effects of excessive hydrogen sulfide on a subsequent sulfuric acid system.

Description

technical field [0001] The invention relates to the technical field of flue gas mercury removal, in particular to a flue gas mercury removal method. Background technique [0002] At present, flue gas mercury removal technologies mainly include chlorination method, activated carbon method, sodium sulfide method, selenium filtration method, sulfuric acid washing method, potassium iodide method, ozone method, SCR method, etc., which are used under different flue gas conditions. Among them, the chlorination method, iodine complexation-electrolysis method, sulfuric acid washing method and sodium sulfide method are used for non-ferrous smelting flue gas. The main application characteristics of the main flue gas mercury removal methods are as follows: [0003] ① Chlorination method: also known as Boliden-Norzink mercury removal method, which was first promoted to China by Boliden Company. This method is used to remove gaseous zero-valent mercury in smelting flue gas, and can prod...

Claims

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Application Information

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IPC IPC(8): B01D53/79B01D53/64B01D53/50
CPCB01D53/502B01D53/507B01D53/64B01D53/79B01D2251/304B01D2251/404B01D2251/60B01D2251/608B01D2257/602B01D2258/0283
Inventor 王姣赵凯杜士帽马小乐
Owner CHINA ENFI ENGINEERING CORPORATION
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