Filter bag/filter element for removing mercury in flue gas as well as preparation method and application thereof

A removal and filter bag technology, which is applied in the field of flue gas purification and pollution control, can solve the problems of high-efficiency and fixed removal of mercury in all forms, the influence of mercury removal agents on the reuse of flue dust, high equipment investment and operating costs, etc., to achieve mercury removal Superior performance, large market application prospects, and the effect of reducing construction and operating costs

Active Publication Date: 2021-12-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that mercury removal and dust removal units operate independently in the current flue gas purification process, occupying a large space, high equipment investment and operating costs, or difficulties in efficient and fixed removal of full-form mercury in flue gas, and mercury removal agents affect the reuse of flue dust. The invention proposes a filter bag / filter element for removing mercury in flue gas and its preparation method and application, aiming to develop a high-efficiency fixed mercury removal unit for flue gas mercury removal or for simultaneous flue gas dust removal unit Advanced materials and technologies for dust and mercury removal to realize mercury removal or dust removal and mercury removal unit coupling integration and integration in the flue gas purification process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Cut the polyphenylene sulfide plastic fiber needle felt into a square with an area of ​​10cm×10cm, a thickness of 2.2mm, and a weight of 4.89g. 0.9 g of sodium selenite and 6.2 g of reduced glutathione were simultaneously added into 60 mL of the solution and stirred until completely dissolved to obtain a selenium-containing mixed solution. Soak the needle-punched felt in the selenium-containing mixed solution and stir for 10 minutes once, and ultrasonically for 10 minutes, add alkali to the solution to adjust the pH=8 to reduce selenite to elemental selenium, and continue to stir for 8 hours until the selenium in the solution is reduced and loaded on the Obtain the selenium-loaded felt body on the needle-punched felt, carry out PTFE coating and protective solution (antistatic agent 30%, antioxidant 40%, antibacterial agent 30%) spray surface treatment after selenium-loaded felt body 110 ℃ of vacuum drying 8h, then 80 Dry again at ℃ for 4 hours, take out the felt body an...

Embodiment 2

[0037]Cut the polyester fiber needle felt into a square with an area of ​​10cm×10cm, a thickness of 2.4mm, and a weight of 4.77g. 0.46g of ammonium selenite and 17.04mL of sulfurous acid were simultaneously added into 80mL of the solution and stirred until completely dissolved to obtain a selenium-containing mixed solution. Soak the needle-punched felt in the selenium-containing mixed solution and stir for 5 minutes once, ultrasonically for 20 minutes, add alkali to the solution to adjust the pH=8.5 to reduce the selenite to elemental selenium, and continue to stir again for 12 hours until the selenium in the solution is reduced and loaded on the Obtain selenium-carrying felt on the needle-punched felt, carry out porous PU film and protective solution (antistatic agent 30%, antibacterial agent 30%, coupling agent 20%, hydrophobic agent 20% after selenium-carrying felt body 120 ℃ of vacuum drying 6h ) spray surface treatment, then dry again at 90°C for 2 hours, take out the fel...

Embodiment 3

[0039] Cut the polytetrafluoroethylene fiber needle felt into a square with an area of ​​1m×1m, a thickness of 1.8mm, and a weight of 557g. 135g of calcium selenite and 496g of reduced glutathione were simultaneously added to 5L of the solution and stirred until completely dissolved to obtain a selenium-containing mixed solution. Soak the needle-punched felt in the selenium-containing mixed solution and stir for 5 minutes once, ultrasonic for 15 minutes, add alkali to the solution to adjust pH = 9 to reduce selenite to elemental selenium, and continue to stir for 6 hours until the selenium in the solution is reduced. Obtain selenium-carrying felt on the needle-punched felt, carry out porous PU film and protective solution (antistatic agent 20%, antibacterial agent 10%, coupling agent 40%, hydrophobic agent 30% after selenium-carrying felt body 120 ℃ of vacuum drying 6h ) spray surface treatment, then dry again at 100°C for 2 hours, take out the felt body, cut and sew it into a...

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Abstract

The invention discloses a filter bag/filter element for removing mercury in flue gas and a preparation method and application thereof. The filter bag/filter element is characterized in that a needled felt serves as main base cloth, selenite serves as a selenium source, the selenite is converted into nano-selenium to be loaded on a felt body in situ under the action of a reducing agent, the felt body is subjected to surface treatment and drying again after vacuum drying, and the filter bag/filter element is obtained; and the felt body is taken out, and is cut and sewed to obtain the filter bag/filter element. The filter bag/filter element provided by the invention has mercury removal and dust removal functions, not only can replace a traditional filter bag to simultaneously remove smoke dust and mercury in a cloth bag dust removal unit in a temperature interval of 50-200 DEG C, but also can be specially used as the filter bag/filter element for efficiently removing mercury in a mercury removal unit in a flue gas purification process.

Description

technical field [0001] The invention belongs to the field of flue gas purification and pollution control, and in particular relates to a filter bag / filter element for removing mercury in flue gas and its preparation method and application. Background technique [0002] The flue gas produced by industries such as metallurgy, coal-fired power plants, cement production, petrochemical industry, garbage disposal, and natural gas production contains tiny dust particles and mercury, which has caused great pollution to the atmospheric environment. Mercury and dust enter the human body, causing serious harm to the skin and respiratory tract. Mercury is also a highly toxic, corrosive, volatile, and easy to migrate and diffuse substance, which can accumulate in the body and transform into highly toxic methyl Mercury can seriously damage the central nervous system, cause brain damage, and even endanger life. [0003] The mainstream dust removal methods in the industrial flue gas purifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D46/00B01D46/02
CPCB01D46/0001B01D46/023B01D46/0027
Inventor 李海龙孟凡悦杨建平屈文麒杨泽群朱鹏琳
Owner CENT SOUTH UNIV
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