CN110898529A - Smoke filtering composite filter material for glass melting furnace - Google Patents
Smoke filtering composite filter material for glass melting furnace Download PDFInfo
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- CN110898529A CN110898529A CN201911303777.4A CN201911303777A CN110898529A CN 110898529 A CN110898529 A CN 110898529A CN 201911303777 A CN201911303777 A CN 201911303777A CN 110898529 A CN110898529 A CN 110898529A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/08—Filter cloth, i.e. woven, knitted or interlaced material
- B01D39/083—Filter cloth, i.e. woven, knitted or interlaced material of organic material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/08—Filter cloth, i.e. woven, knitted or interlaced material
- B01D39/086—Filter cloth, i.e. woven, knitted or interlaced material of inorganic material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/0001—Making filtering elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/54—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms
- B01D46/543—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms using membranes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/10—Filtering material manufacturing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0241—Other waste gases from glass manufacture plants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Inorganic Chemistry (AREA)
- Filtering Materials (AREA)
Abstract
The invention relates to a smoke purification composite filter material for a glass melting furnace, which comprises glass fiber base cloth, a filter material and a PTFE (polytetrafluoroethylene) membrane, wherein the filter material consists of ceramic fibers, glass fibers and chemical fibers, the glass fiber base cloth and the fibers are needled, and the surface of the glass fiber base cloth is coated with the PTFE membrane; the flue gas purification filter material for the glass melting furnace is characterized in that a wet process and softener treatment are applied, high-strength corrosion-resistant ceramic fibers are combined with chemical fibers and glass fibers with different melting points, the problem that the ceramic fibers cannot be carded into felts and coated films is solved through multiple treatment processes, the ceramic fibers and the glass fibers play a role in framework support and filtration, the low-melting-point chemical fibers are used, the chemical fibers are carbonized at the temperature higher than the melting point of the fibers, filter holes are enlarged, viscous fine powder in the glass melting furnace can be effectively removed, the filter precision is high, the corrosion resistance is high, the mechanical property is high, the cost is low, the service life is long, the existing environment-friendly ultralow emission requirement can be met, and the filter material can replace the existing.
Description
Technical Field
The invention relates to the field of high-temperature flue gas purification filter materials, in particular to a flue gas purification composite filter material for a glass melting furnace.
Background
2018.8.2, emission Standard of pollutants for the glass industry for daily use (manuscript to request), was published by the ministry of ecology. The survey of comments makes specific provisions on the emission of atmospheric pollutants and water pollutants in the daily glass industry, and since 2019.1.1 days, the emission limit of pollutants in a newly-built glass melting furnace is as follows: particle 50mg/m3. The emission concentration of sulfur dioxide is 400mg/m3Nitrogen oxide 700mg/m330mg/m of hydrogen chloride3Fluoride 5mg/m3. The glass melting furnace generally takes petroleum coke powder/heavy oil/coal gas/natural gas and the like as fuels, and smoke dust contains a large amount of NOx, SOx and Na2O、k2Alkali metal salts such as O, etc., and the alkali metal salts react with dust, etc. in flue gas to produce Na2SO4Has high viscosity, can adsorb dust to form powder cake, and can also react with SO in flue gas3Further reaction to produce Na with higher viscosity2S2O7And has high corrosivity. The particle size of the smoke dust of the glass melting furnace is low, and the fine powder is abundant. According to tests, the particle size of the dust in the glass melting furnace industry is lower than 20 μm, and the particle size of the dust in the cement industry is 80 μm. Therefore, compared with other industries, the emission of the glass melting furnace industry has complex components, more fine powder, high corrosivity, high viscosity and higher filtering difficulty, and is greatly different from the industries of cement, steel and the like in the building material industry.
Due to the flue gas particularity of the industry, the filtering materials commonly used in building material industries such as cement, electric power and the like are not suitable for the flue gas of the glass melting furnace industry. At present, PTFE filter materials are mostly adopted in the glass melting furnace industry, PTFE is commonly called as plastic king, and the PTFE is used in extreme severe environments such as the waste incineration industry and the like, and has the advantages of good corrosion resistance, high preparation cost and high price. Patent CN105999888 discloses a technology of realizing glass kiln smoke ultra-low emission, this technology adopts stove smoke clean system to purify the stove smoke that the glass kiln produced, and the stove smoke that comes out from the waste heat pot gets into the desulfurization of wet flue gas desulfurization tower desulfurization after the heat transfer cooling, and the desulfurization stove smoke is discharged through the chimney after the heating heaies up, and polyimide acupuncture felt (P84) is chooseed for use to the filter bag filter material of sack cleaner. The P84 fiber for the P84 filter bag is imported fiber abroad, belongs to polycondensation fiber, is not resistant to hydrolysis, is easy to hydrolyze in high-temperature high-humidity and acid-base environments, and cannot be fully applied to the industry of glass kilns. CN101940857 discloses a high-temperature resistant ceramic fiber gas filter material, which is composed of a ceramic fiber layer and a calcium silicate layer adhered together. The ceramic fiber pipe rigid filter material can be applied to the fields of dust removal and filtration such as high-temperature flue gas and dry dust removal.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the smoke filtering composite filter material for the glass melting furnace, which adopts the mixed fiber containing the ceramic fiber, selects a mode of combining a wet method and a dry needling process, can effectively remove viscous fine powder in the glass melting furnace, has high filtering precision, corrosion resistance, high mechanical property, low cost and long service life, and can meet the current environment-friendly ultralow emission requirement.
The invention is realized by the following technical scheme:
the composite filter material comprises glass fiber base cloth, a filter material and a PTFE (polytetrafluoroethylene) membrane, wherein the filter material is composed of ceramic fibers, glass fibers and chemical fibers, the glass fiber base cloth and the filter material are formed by needling, and the surface of the glass fiber base cloth is coated with the PTFE membrane.
Further, the chemical fiber is at least one of terylene, polystyrene, polypropylene fiber, polyvinyl chloride fiber, spandex, polytetrafluoroethylene, polyimide and aramid fiber; in the preparation process of the needled felt, the chemical fibers play an effective fiber winding role, so that web formation is facilitated. In the application process of high-temperature flue gas, the ceramic fibers and the glass fibers in the felt layer play roles in supporting and filtering the skeleton, and when the temperature is higher than the melting point temperature of the fibers, the chemical fibers are carbonized, and the filtering holes are enlarged.
As another invention point of the invention, the preparation method of the smoke composite filter material for the glass melting furnace comprises the following steps: (1) humidifying and deslagging the ceramic fiber; (2) pretreating glass fiber base cloth; (3) forming a felt by the filter material and glass fiber base cloth; (4) carrying out primary surface treatment; (5) performing secondary surface treatment; (6) and (5) pressing the film.
The step (1) of humidifying and deslagging the ceramic fiber: placing the ceramic fiber in the water solution of softener R with the volume concentration of 5-30%, stirring for 5-15min, processing by a slag remover, and drying at 150-280 ℃.
Further, the softener R is one or more of water-soluble silicone oil, hydroxyl silicone oil, methyl silicone oil and alcohol-based quaternary ammonium salt.
The step (2) of pretreating the glass fiber base cloth: the glass fiber base cloth is dipped into a treating agent, and is placed in a constant-temperature oven with the temperature of 100-280 ℃ for baking for 1-20 min, wherein the treating agent comprises 2-90% of PTFE emulsion, 2-90% of acrylate emulsion and the balance of water.
And (3) forming a felt by the filter material and the glass fiber base cloth: preparing a needled felt by opening, carding, lapping, pre-needling and main needling of ceramic fibers, glass fibers and chemical fibers which are subjected to humidification and deslagging pretreatment and glass fiber base cloth which is subjected to pretreatment; the glass fiber comprises, by weight, 15-90 parts of ceramic fibers, 30-90 parts of glass fibers and 5-40 parts of chemical fibers.
The (4) first surface treatment: and (3) dipping the needled felt prepared in the step (3), wherein the treatment temperature is 100-320 ℃, the baking time is 1-30 min, and the treating agent for the first surface treatment comprises 2-90% of PTFE emulsion, 2-90% of acrylate emulsion, 1-10% of defoaming agent, 2-20% of amino silicone oil, 2-20% of waterproofing agent and the balance of water.
The step (5) of secondary surface treatment: dipping the needled felt subjected to the first surface treatment in the step (4) again, wherein the treatment temperature is 160-350 ℃, and the baking time is 1-25 min; the second surface treatment agent comprises 2-50% of PTFE emulsion, 1-10% of smooth and soft finishing agent and the balance of water.
The step (6) is laminating: and (3) coating the needled felt subjected to the secondary surface treatment in the step (5) with a PTFE (polytetrafluoroethylene) membrane through high-temperature hot pressing at the temperature of 200-380 ℃, under the pressure of 0.1-2MPa, wherein the aperture of the PTFE membrane is 0.6-2 mu m, and the aperture ratio is 80-95%.
The flue gas purification filter material for the glass melting furnace is characterized in that a wet process and a softener are applied to combine high-strength corrosion-resistant ceramic fibers with chemical fibers and glass fibers with different melting points, and a multi-treatment process is adopted to improve the working condition environment of the glass melting furnace, wherein the glass fibers cannot be carded into felts and coated films and cannot resist high corrosion and high-humidity fluorine-containing viscous dust environment.
Detailed Description
The present invention will be further illustrated with reference to the following examples, but the present invention is not limited to the following examples.
Example 1
(1) Ceramic fiber humidification and deslagging pretreatment: placing the ceramic fiber in the water solution of softener R with the volume concentration of 20%, stirring for 15min at the speed of 30m/min, processing by a slag remover, and drying at 180 ℃. The ceramic fibers had a diameter of 4 μm.
(2) Pretreating glass fiber base cloth: the glass fiber base cloth is pretreated, and the gram weight of the base cloth is 320g/m2(ii) a The glass fiber base cloth is dipped in a treating agent, wherein the treating agent comprises 15% of PTFE emulsion, 5% of acrylate emulsion and the balance of water. The treatment temperature is 260 ℃ in the central high-temperature area, 120 ℃ in the inlet low-temperature area, and the baking time is 10 min.
(3) Forming a felt by the filter material and glass fiber base cloth: the needled felt is prepared from ceramic fibers, glass fibers, chemical fibers and glass fiber base cloth which are subjected to humidification and deslagging pretreatment through opening, carding, lapping, pre-needling and main needling, wherein 35 parts of ceramic fibers, 10 parts of aramid fibers, 5 parts of polyester fibers and 50 parts of glass fibers are selected.
(4) First surface treatment: and (3) dipping the needled felt prepared in the step (3), wherein the treatment temperature is 100 ℃ in a low-temperature area and 260 ℃ in a high-temperature area, the baking time is 12min, and the treating agent for the first surface treatment comprises 10% of PTFE emulsion, 5% of acrylate emulsion, 2% of defoaming agent, 2% of amino silicone oil, 3% of waterproofing agent and the balance of water.
(5) And (3) second surface treatment: dipping the needled felt subjected to the first surface treatment in the step (4) again, wherein the treatment temperature is 160 ℃ in a low-temperature area and 320 ℃ in a high-temperature area, and the baking time is 15 min; the treating agent for the second surface treatment comprises 8% of PTFE emulsion, 2% of smooth and soft finishing agent and the balance of water.
(6) Film covering: and (4) covering the needled felt subjected to the secondary surface treatment in the step (5) with a PTFE membrane through high-temperature hot pressing at the temperature of 280 ℃ and under the pressure of 0.2 MPa.
Example 2
(1) Ceramic fiber humidification and deslagging pretreatment: placing the ceramic fiber in the water solution of softener R with the volume concentration of 20%, stirring for 10min at the speed of 20m/min, processing by a slag remover, and drying at 150 ℃. The ceramic fibers had a diameter of 3 μm.
(2) Pretreating glass fiber base cloth: the glass fiber base cloth is pretreated, and the gram weight of the base cloth is 320g/m2(ii) a The glass fiber base cloth is dipped in a treating agent, wherein the treating agent comprises 10% of PTFE emulsion, 8% of acrylate emulsion and the balance of water. The treatment temperature is 260 ℃ in the central high-temperature area and 120 ℃ in the inlet low-temperature area.
(3) Forming a felt by the filter material and glass fiber base cloth: the needled felt is prepared from ceramic fibers, glass fibers, chemical fibers and glass fiber base cloth which are subjected to humidification and deslagging pretreatment through opening, carding, lapping, pre-needling and main needling, wherein 35 parts of ceramic fibers, 15 parts of polyester fibers and 50 parts of glass fibers are selected.
(4) First surface treatment: and (3) dipping the needled felt prepared in the step (3), wherein the treatment temperature is 120 ℃ in a low-temperature area and 200 ℃ in a high-temperature area, the baking time is 12min, and the treating agent for the first surface treatment comprises 8% of PTFE emulsion, 6% of acrylate emulsion, 1% of defoaming agent, 2% of amino silicone oil, 3% of waterproofing agent and the balance of water.
(5) And (3) second surface treatment: dipping the needled felt subjected to the first surface treatment in the step (4) again, wherein the treatment temperature is 120 ℃ in a low-temperature region, 200 ℃ in a high-temperature region, and the baking time is 22 min; the treating agent for the second surface treatment comprises 8% of PTFE emulsion, 2% of smooth and soft finishing agent and the balance of water.
(6) Film covering: and (4) covering the needled felt subjected to the secondary surface treatment in the step (5) with a PTFE membrane through high-temperature hot pressing at the temperature of 220 ℃ and under the pressure of 0.15 MPa.
Example 3
(1) Ceramic fiber humidification and deslagging pretreatment: placing the ceramic fiber in the water solution of softener R with the volume concentration of 20%, stirring for 15min at the speed of 30m/min, processing by a slag remover, and drying at 180 ℃. The ceramic fibers had a diameter of 4 μm.
(2) Pretreating glass fiber base cloth: the glass fiber base cloth is pretreated, and the gram weight of the base cloth is 320g/m2(ii) a The glass fiber base cloth is dipped with a treating agent, wherein the treating agent comprises 15 parts of PTFE emulsion, 5 parts of acrylate emulsion and the balance of water. The treatment temperature is 260 ℃ in the central high-temperature area and 120 ℃ in the inlet low-temperature area,
(3) forming a felt by the filter material and glass fiber base cloth: the needled felt is prepared from ceramic fibers, glass fibers, chemical fibers and glass fiber base cloth which are subjected to humidification and deslagging pretreatment through opening, carding, lapping, pre-needling and main needling, wherein 80 parts of ceramic fibers and 20 parts of glass fibers are selected.
The product is easy to peel off, has low strength and can not meet the requirements of subsequent processing and use.
The product performance results are shown in the comparative table:
comparative example 1
The needled felt composite filter material is prepared from PTFE fibers and PTFE base cloth through loosening, carding, lapping, pre-needling and main needling. Gram weight of 700g/m2. The surface is coated with a PTFE film.
Comparison table
Claims (10)
1. The utility model provides a compound filter material of flue gas for glass melting furnace which characterized in that: the composite filter material comprises glass fiber base cloth, a filter material and a PTFE (polytetrafluoroethylene) membrane, wherein the filter material is composed of ceramic fibers, glass fibers and chemical fibers, the glass fiber base cloth and the filter material are formed by needling, and the surface of the glass fiber base cloth is coated with the PTFE membrane.
2. The smoke composite filter material for the glass melting furnace as claimed in claim 1, which is characterized in that: the chemical fiber is at least one of terylene, polystyrene, polypropylene fiber, polyvinyl chloride fiber, spandex, polytetrafluoroethylene, polyimide and aramid fiber.
3. The method for preparing the smoke composite filter material for the glass melting furnace according to claim 1 or 2, which comprises the following steps: (1) humidifying and deslagging the ceramic fiber; (2) pretreating glass fiber base cloth; (3) forming a felt by the filter material and glass fiber base cloth; (4) carrying out primary surface treatment; (5) performing secondary surface treatment; (6) and (5) hot-pressing and laminating.
4. The method for preparing the smoke composite filter material for the glass melting furnace according to claim 3, which is characterized by comprising the following steps of: the step (1) of humidifying and deslagging the ceramic fiber: placing the ceramic fiber in the water solution of softener R with the volume concentration of 5-30%, stirring for 5-15min, processing by a slag remover, and drying at 150-280 ℃.
5. The method for preparing the smoke composite filter material for the glass melting furnace according to claim 4, which is characterized by comprising the following steps of: the softener R is one or more of water-soluble silicone oil, hydroxyl silicone oil, methyl silicone oil and alcohol-based quaternary ammonium salt.
6. The method for preparing the smoke composite filter material for the glass melting furnace according to claim 3, which is characterized by comprising the following steps of: the step (2) of pretreating the glass fiber base cloth: the glass fiber base cloth is dipped into a treating agent, and is placed in a constant-temperature oven with the temperature of 100-280 ℃ for baking for 1-20 min, wherein the treating agent comprises 2-90% of PTFE emulsion, 2-90% of acrylate emulsion and the balance of water.
7. The method for preparing the smoke composite filter material for the glass melting furnace according to claim 3, which is characterized by comprising the following steps of: and (3) forming a felt by the filter material and the glass fiber base cloth: preparing a needled felt by opening, carding, lapping, pre-needling and main needling of ceramic fibers, glass fibers and chemical fibers which are subjected to humidification and deslagging pretreatment and glass fiber base cloth which is subjected to pretreatment; the glass fiber comprises, by weight, 15-90 parts of ceramic fibers, 30-90 parts of glass fibers and 5-40 parts of chemical fibers.
8. The method for preparing the smoke composite filter material for the glass melting furnace according to claim 3, which is characterized by comprising the following steps of: the (4) first surface treatment: and (3) dipping the needled felt prepared in the step (3), wherein the treatment temperature is 100-320 ℃, the baking time is 1-30 min, and the treating agent for the first surface treatment comprises 2-90% of PTFE emulsion, 2-90% of acrylate emulsion, 1-10% of defoaming agent, 2-20% of amino silicone oil, 2-20% of waterproofing agent and the balance of water.
9. The method for preparing the smoke composite filter material for the glass melting furnace according to claim 3, which is characterized by comprising the following steps of: the step (5) of secondary surface treatment: dipping the needled felt subjected to the first surface treatment in the step (4) again, wherein the treatment temperature is 160-350 ℃, and the baking time is 1-25 min; the second surface treatment agent comprises 2-50% of PTFE emulsion, 1-10% of smooth and soft finishing agent and the balance of water.
10. The method for preparing the smoke composite filter material for the glass melting furnace according to claim 3, which is characterized by comprising the following steps of: the step (6) is laminating: and (3) coating the needled felt subjected to the secondary surface treatment in the step (5) with a PTFE (polytetrafluoroethylene) membrane through high-temperature hot pressing at the temperature of 200-380 ℃, under the pressure of 0.1-2MPa, wherein the aperture of the PTFE membrane is 0.6-2 mu m, and the aperture ratio is 80-95%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113209726A (en) * | 2021-03-31 | 2021-08-06 | 南京际华三五二一环保科技有限公司 | Preparation method of stiff filter material for pleated filter bag |
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| CN113209726A (en) * | 2021-03-31 | 2021-08-06 | 南京际华三五二一环保科技有限公司 | Preparation method of stiff filter material for pleated filter bag |
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