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A method for efficiently removing elemental mercury in flue gas with sulfur dioxide and nano-sulfur solution

A sulfur dioxide and nano-sulfur technology is applied in the treatment of mercury-containing flue gas and in the field of flue gas purification in the smelting industry with high sulfur and high mercury. and other problems, to achieve the effect of simple and efficient removal, simple and convenient preparation and application process, and enhanced mercury removal performance

Active Publication Date: 2020-07-31
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the current problems of complex preparation of mercury removal agents, small mercury capture capacity, low mercury removal efficiency and great influence of sulfur dioxide, the purpose of the present invention is to provide a high-efficiency A method for removing gaseous mercury in mercury-containing flue gas, which is simple and efficient, captures mercury in a large capacity, and can resist the influence of sulfur dioxide, so as to realize mercury pollution control and emission reduction in flue gas with high sulfur and high mercury content

Method used

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  • A method for efficiently removing elemental mercury in flue gas with sulfur dioxide and nano-sulfur solution
  • A method for efficiently removing elemental mercury in flue gas with sulfur dioxide and nano-sulfur solution
  • A method for efficiently removing elemental mercury in flue gas with sulfur dioxide and nano-sulfur solution

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Experimental program
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Effect test

Embodiment 1

[0033] Add 100ml of Na at a concentration of 0.5mol / L at room temperature 2 S 2 o 3 3ml of saturated sodium dodecylbenzenesulfonate solution was added to the solution as a dispersant, ultrasonically stirred continuously and concentrated sulfuric acid was added drop by drop to adjust the pH of the solution to 2.0 to obtain a nano-sulfur colloidal solution. at 0.3m 3 The flue gas at 25°C is passed into the bubbling scrubber filled with 75ml of nano-sulfur colloid at a gas flow rate of / min. The main composition of the flue gas is (volume ratio): SO 2 1%, CO 2 8%, Hg 0 Contains 0.35mg / m 3 , and the rest are N 2 . After 2h, the solution pH=1.9, the Hg in the flue gas 0 The removal rate remains stable and can reach 91.8%.

Embodiment 2

[0035] Add 100ml of Na at a concentration of 0.5mol / L at room temperature 2 S 2 o 3 3 ml of saturated sodium dodecylbenzenesulfonate solution was added to the solution as a dispersant, ultrasonically stirred continuously and concentrated sulfuric acid was added drop by drop to adjust the pH of the solution to 1.2 to obtain a nano-sulfur colloidal solution. at 0.3m 3 The flue gas at 25°C is passed into the bubbling scrubber filled with 75ml of nano-sulfur colloid at a gas flow rate of / min. The main composition of the flue gas is (volume ratio): SO 2 6% CO 2 8%, Hg 0 Contains 0.35mg / m 3 , and the rest are N 2. After 2 hours, the solution pH=1.8, the Hg in the flue gas 0 The removal rate remains stable and can reach 95.1%.

Embodiment 3

[0037] Add 100ml of Na at a concentration of 0.5mol / L at room temperature 2 S 2 o 3 3 ml of saturated sodium dodecylbenzenesulfonate solution was added to the solution as a dispersant, ultrasonically stirred continuously and concentrated sulfuric acid was added drop by drop to adjust the pH of the solution to 1.2 to obtain a nano-sulfur colloidal solution. at 0.1m 3 The flue gas at 25°C is passed into the bubbling scrubber filled with 75ml of nano-sulfur colloid at a gas flow rate of / min. The main composition of the flue gas is (volume ratio): SO 2 16%, Hg 0 Contains 1.04mg / m 3 , and the rest are N 2 . Flue gas after 2h, solution pH=1.5, medium Hg 0 The removal rate remains stable and can reach 99.7%.

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Abstract

The invention discloses a method for efficiently removing elemental mercury in flue gas through the synergistic effect of sulfur dioxide and a nano-sulfur solution. According to the method, gas-liquidmixing is carried out on the mercury-containing flue gas and the nano-sulfur solution, nano-sulfur reacts with the sulfur dioxide and the elemental mercury in the mercury-containing flue gas, and therefore the elemental mercury in the mercury-containing flue gas is removed. The method has the advantages that efficient purification of the gaseous elemental mercury under the complex flue gas is realized, the removal rate of the gaseous elemental mercury can reach 84.1-99.7%, and washing liquid can be separated, recycled and reused.

Description

technical field [0001] The invention relates to a method for treating mercury-containing flue gas, in particular to a method for efficiently removing elemental mercury in flue gas by using sulfur dioxide in conjunction with nano-sulfur, which is suitable for flue gas purification in smelting industries with high sulfur and high mercury, and belongs to mercury-containing flue gas pollution Control and emission reduction technology field. Background technique [0002] Gaseous mercury has become one of the pollutants strictly controlled in the world because of its high toxicity, mobility and easy bioaccumulation. As one of the first countries to sign the Minamata Convention, a series of policies and regulations dedicated to the control of mercury pollution and emission reduction have become increasingly stringent. Facing the country and the government's high attention to the pollution control and emission reduction of mercury-containing flue gas, it is easy to achieve It is im...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/64B01D53/50
CPCB01D53/507B01D53/64B01D53/78B01D2258/0283
Inventor 刘恢谢小峰颜旭刘操杨姝陈昊陈志军柴立元闵小波
Owner CENT SOUTH UNIV
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