A filter bag/filter element for removing mercury in flue gas and its preparation method and application

A filter bag and flue gas technology, which is applied in separation methods, chemical instruments and methods, transportation and packaging, etc., can solve the difficulty of efficient fixed removal of full-form mercury, the effect of mercury remover on the reuse of smoke and dust, equipment investment and operating costs. High problems, to achieve the effect of superior mercury removal performance, large market application prospects, and reduced construction and operating costs

Active Publication Date: 2022-08-02
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] The polyphenylene sulfide plastic fiber needle-punched felt was cut 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 to 60 mL of the solution and stirred until completely dissolved to obtain a selenium-containing mixed solution. The needled felt was immersed in a selenium-containing mixed solution, stirred for 10 minutes at a time, and sonicated for 10 minutes. An alkali was added to the solution to adjust pH=8 to reduce selenite to elemental selenium, and continued stirring for a second time for 8 hours until the selenium in the solution was reduced and supported in the solution. The selenium-loaded felt was obtained on the needle-punched felt, and the selenium-loaded felt was vacuum-dried at 110°C for 8 hours, and then sprayed with PTFE film and protective liquid (30% antistatic agent, 40% antioxidant, and 30% antibacterial agent) for surface treat...

Embodiment 2

[0037]The polyester fiber needle-punched felt is cut into a square with an area of ​​10cm×10cm, a thickness of 2.4mm, and a weight of 4.77g. 0.46 g of ammonium selenite and 17.04 mL of sulfurous acid were simultaneously added to 80 mL of the solution and stirred until completely dissolved to obtain a selenium-containing mixed solution. The needled felt was immersed in a selenium-containing mixed solution, stirred for 5 min at a time, and sonicated for 20 min. Add alkali to the solution to adjust pH=8.5 to reduce selenite to elemental selenium, and continue to stir for a second time for 12 h until the selenium in the solution was reduced and supported in the solution. The selenium-loaded felt body was obtained on the needle-punched felt, and the selenium-loaded felt body was vacuum-dried at 120°C for 6 hours and then coated with porous PU and protective liquid (antistatic agent 30%, antibacterial agent 30%, coupling agent 20%, hydrophobic agent 20% ) spray surface treatment, th...

Embodiment 3

[0039] The polytetrafluoroethylene fiber fiber needle-punched felt is cut into a square with an area of ​​1 m × 1 m, a thickness of 1.8 mm, and a weight of 557 g. 135 g of calcium selenite and 496 g of reduced glutathione were simultaneously added to the 5 L solution and stirred until completely dissolved to obtain a selenium-containing mixed solution. The needled felt was immersed in a selenium-containing mixed solution, stirred for 5 min at a time, and sonicated for 15 min. Add alkali to the solution to adjust pH=9 to reduce selenite to elemental selenium, and continue to stir for a second time for 6 h until the selenium in the solution was reduced and supported in the solution. The selenium-loaded felt was obtained on the needle-punched felt, and the selenium-loaded felt was vacuum-dried at 120°C for 6 hours, and then the porous PU film and protective solution (20% antistatic agent, 10% antibacterial agent, 40% coupling agent, and 30% hydrophobic agent) were applied. ) spra...

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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. Needle-punched felt is used as the main base cloth, selenite is used as a selenium source, and under the action of a reducing agent, the The selenate is converted into nano selenium and carried on the felt body in situ, the felt body is vacuum-dried and then subjected to surface treatment and then dried again, and the felt body is taken out and cut and sewn to obtain a filter bag / filter element. The filter bag / filter element of the present invention has both mercury removal and dust removal functions, which can not only replace the traditional filter bag to simultaneously remove smoke dust and mercury in the temperature range of 50-200°C in the bag dust removal unit, but also can be specially used in the flue gas purification process. The mercury removal unit is used as a filter bag / cartridge for efficient mercury removal.

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 a preparation method and application thereof. Background technique [0002] The flue gas generated by metallurgy, coal-fired power plants, cement production, petrochemical industry, garbage disposal, natural gas production and other industries contains tiny dust particles and mercury, which cause 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, easy to migrate and diffuse substance, which can accumulate in the body and transform into highly toxic methyl Mercury, severely damages the central nervous system, causing brain damage and even life-threatening. [0003] The mainstream dust removal methods in the industrial flue gas purificat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D46/00B01D46/02B01D46/88
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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