CN109481989B - High-temperature-resistant dehumidifying ceramic filter element and preparation method thereof - Google Patents
High-temperature-resistant dehumidifying ceramic filter element and preparation method thereof Download PDFInfo
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- 239000000919 ceramic Substances 0.000 title claims abstract description 97
- 238000002360 preparation method Methods 0.000 title claims abstract description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 57
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 42
- 239000011248 coating agent Substances 0.000 claims abstract description 40
- 238000000576 coating method Methods 0.000 claims abstract description 40
- 238000002156 mixing Methods 0.000 claims abstract description 25
- XPBBUZJBQWWFFJ-UHFFFAOYSA-N fluorosilane Chemical compound [SiH3]F XPBBUZJBQWWFFJ-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000005543 nano-size silicon particle Substances 0.000 claims abstract description 23
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 23
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000000835 fiber Substances 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000011230 binding agent Substances 0.000 claims abstract description 13
- 239000011148 porous material Substances 0.000 claims abstract description 6
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- 239000011259 mixed solution Substances 0.000 claims description 20
- 229920000058 polyacrylate Polymers 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 13
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 12
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 8
- 239000004342 Benzoyl peroxide Substances 0.000 claims description 8
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 claims description 8
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 claims description 8
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 claims description 8
- 235000019400 benzoyl peroxide Nutrition 0.000 claims description 8
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 239000000243 solution Substances 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 7
- PMQIWLWDLURJOE-UHFFFAOYSA-N triethoxy(1,1,2,2,3,3,4,4,5,5,6,6,7,7,10,10,10-heptadecafluorodecyl)silane Chemical compound CCO[Si](OCC)(OCC)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)CCC(F)(F)F PMQIWLWDLURJOE-UHFFFAOYSA-N 0.000 claims description 7
- 239000004642 Polyimide Substances 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 239000006185 dispersion Substances 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 229920001721 polyimide Polymers 0.000 claims description 5
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims description 4
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 claims description 4
- 238000010009 beating Methods 0.000 claims description 4
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 claims description 4
- WBJINCZRORDGAQ-UHFFFAOYSA-N formic acid ethyl ester Natural products CCOC=O WBJINCZRORDGAQ-UHFFFAOYSA-N 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical group O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 4
- 238000013329 compounding Methods 0.000 claims description 3
- 239000000428 dust Substances 0.000 abstract description 39
- 239000003546 flue gas Substances 0.000 abstract description 17
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 15
- 238000011010 flushing procedure Methods 0.000 abstract description 8
- 230000004048 modification Effects 0.000 abstract description 5
- 238000012986 modification Methods 0.000 abstract description 5
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 239000000377 silicon dioxide Substances 0.000 description 4
- 239000000779 smoke Substances 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000006477 desulfuration reaction Methods 0.000 description 3
- 230000023556 desulfurization Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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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
- B01D39/14—Other self-supporting filtering material ; Other filtering material
-
- 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
-
- 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
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtering Materials (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention relates to the technical field of flue gas dust removal, in particular to a high-temperature-resistant dehumidifying ceramic filter element which comprises a ceramic tube body, wherein a nano hydrophobic coating is coated on the surface of the ceramic tube body, the nano hydrophobic coating is nano silicon dioxide modified by fluorosilane, the ceramic tube body is formed by mixing alumina fiber and a binder, and micropores are formed in the surface of the ceramic tube body. According to the high-temperature-resistant dehumidifying ceramic filter element, the nano hydrophobic coating is coated on the surface of the ceramic tube body, hydrophobic modification is carried out on the ceramic tube body and the pore surface, the occurrence that water drops are adsorbed and condensed on the surface of the ceramic tube body is reduced, and the service life of the ceramic tube body is prolonged. The invention also relates to a preparation method of the high-temperature-resistant dehumidifying ceramic filter element. The ceramic tube body with the nano hydrophobic coating compounded on the surface obtained by the preparation method can still ensure that the dust removal efficiency is over 95 percent at the temperature of below 400 ℃, the dust removal temperature window is high, the dust removal efficiency is over 90 percent after back flushing cleaning, and the dust removal efficiency is stable.
Description
Technical Field
The invention relates to the technical field of flue gas dust removal, in particular to a high-temperature-resistant dehumidifying ceramic filter element and a preparation method thereof.
Background
The boiler inevitably produces dust and flue gas in the in-process that uses, and the dust removal of boiler is exactly that the dust in the boiler is separated from the flue gas to reduce dust pollution and be favorable to further carrying out treatments such as desulfurization, denitration to the flue gas. Along with the development of society, environmental protection is more and more emphasized by people, and boiler dust removal is also applied to various fields of industrial production. In the boiler dust removal technology, the filter type dust remover is widely applied due to the small size in the aspect of layout. But present bag collector is difficult to apply to the high temperature flue gas dust removal more than 300 ℃ because of the material reason, therefore high temperature resistant ceramic filter core should be transported and come into existence, but because be mingled with high temperature vapor in the high temperature flue gas usually, use intermittent type at the dust remover, vapor adheres to and condenses into the liquid drop on the ceramic filter core, and the ceramic filter core local heating is inhomogeneous when high temperature flue gas later passes through, takes place ceramic filter core surface fracture easily, life greatly reduced. Therefore, how to improve the existing ceramic filter element to prevent water drops from condensing on the surface has important significance for prolonging the service life of the ceramic filter element.
Disclosure of Invention
The embodiment of the invention aims to provide a high-temperature-resistant dehumidifying ceramic filter element, which is used for solving the problem that water drops are easy to condense on the surface of the ceramic filter element in the prior art.
In order to achieve the above object, an embodiment of the present invention provides a high temperature resistant dehumidifying ceramic filter element, which includes a ceramic tube body, a nano hydrophobic coating is coated on the surface of the ceramic tube body, the nano hydrophobic coating is nano silica modified by fluorosilane, the ceramic tube body is formed by mixing alumina fiber and a binder, the surface of the ceramic tube body has micropores, and the pore diameter of the micropores is 5nm to 200 nm.
As an improvement of the technical scheme, the nano silicon dioxide modified by the fluorosilane is nano silicon dioxide modified by heptadecafluorodecyltriethoxysilane.
As an improvement of the technical scheme, the diameter of the alumina fiber is 5-15 μm, and the length of the monofilament is 5-30 mm.
As an improvement of the technical scheme, the adhesive is silica sol or polyimide.
According to the scheme, the nano hydrophobic coating is coated on the surface of the ceramic pipe body, the surface roughness of the ceramic pipe body is increased, and the nano hydrophobic coating can not seal micropores on the surface of the ceramic pipe body, so that the hydrophobic modification is carried out on the ceramic pipe body and the pore surface, the occurrence of water drops adsorbed and condensed on the surface of the ceramic pipe body is reduced, and the service life of the ceramic pipe body is prolonged.
The embodiment of the invention also provides a high-temperature-resistant dehumidifying ceramic filter element, which comprises the following steps:
step one, preparing a ceramic tube body, namely mixing alumina fibers, a binder and water, adding the mixture into a mixing roll for mixing, uniformly mixing to form pug with certain plasticity, centrifuging the pug by using a knockout machine for high-speed rotation, uniformly beating the outside on a mould layer by using a vacuum suction force to form a filter element blank body, and drying to obtain the ceramic tube body;
step two, preparing nano silicon dioxide modified by fluorosilane, namely adding nano silicon dioxide powder into acetone for dispersion, sequentially adding heptadecafluorodecyltriethoxysilane and acetic acid solution, continuously stirring until the reaction is complete, and centrifuging to obtain nano silicon dioxide modified by fluorosilane;
step three, preparing a polyacrylate copolymer, namely forming a mixed solution I from methyl methacrylate, methyl acrylate, ethyl formate and butyl acrylate, uniformly stirring under the protection of nitrogen, adding benzoyl peroxide into butyl acetate to dissolve the benzoyl peroxide to prepare a mixed solution II, slowly adding the mixed solution II into the mixed solution I, and continuously stirring to obtain the polyacrylate copolymer;
and step four, preparing a hydrophobic coating on the surface of the ceramic tube body, mixing the nano silicon dioxide modified by the fluorosilane obtained in the step two and the polyacrylate copolymer obtained in the step three according to the mass ratio of 1: 1-5, adding the mixture into butyl acetate to prepare a nano hydrophobic coating liquid, immersing the ceramic tube body obtained in the step one into the nano hydrophobic coating liquid, and compounding the nano hydrophobic coating on the surface of the ceramic tube body.
As an improvement of the technical scheme, in the step one, the mass ratio of the alumina fiber to the binder is 1: 0.05-0.5.
In the first step, the adhesive is polyimide.
As an improvement of the technical scheme, in the second step, nano silicon dioxide modified by fluorosilane is obtained by centrifugation and is dried into powder in vacuum at 130-145 ℃.
As an improvement of the technical scheme, in the third step, after the mixed solution II is slowly added into the mixed solution I, the temperature is raised to 75-85 ℃, and the mixture is stirred for 1-3 hours to obtain the polyacrylate copolymer.
As an improvement of the above technical scheme, in the fourth step, before the ceramic tube body is immersed in the nano hydrophobic coating liquid, the ceramic tube body is cleaned by using a sodium hydroxide solution.
The preparation method is characterized in that nano-silica is modified by fluorosilane and compounded to the surface of the ceramic tube under the action of polyacrylate copolymer, so that the bonding firmness between the fluorosilane modified nano-silica and the ceramic tube is improved, the ceramic tube with the nano-hydrophobic coating compounded on the surface can still ensure that the dust removal efficiency is over 95 percent at the temperature of below 400 ℃, the dust removal temperature window is high, the dust removal efficiency is over 90 percent after back flushing cleaning, and the dust removal efficiency is stable. Because the initial flue gas temperature is higher, the flue gas temperature is reduced after passing through the ceramic tube body, so that the desulfurization and desulfurization unit can be connected to the rear end of the dust removal of the ceramic tube body, and the practicability is good.
Drawings
Fig. 1 is a schematic structural diagram of a high-temperature-resistant dehumidifying ceramic filter element provided in an embodiment of the present invention.
In the figure: 10-ceramic tube body, 20-nano hydrophobic coating.
Detailed Description
The embodiments of the present invention are described below by way of examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure of the present specification.
As shown in fig. 1, an embodiment of the present invention first provides a high temperature resistant dehumidifying ceramic filter element, which includes a ceramic tube 10, a nano hydrophobic coating 20 is coated on a surface of the ceramic tube 10, the nano hydrophobic coating 20 is nano silica modified by fluorosilane, the ceramic tube 10 is formed by mixing alumina fiber and a binder, and the surface of the ceramic tube 10 has micropores with a pore diameter of 5nm to 200 nm. This high temperature resistant dehumidification ceramic filter core installs on the card of dust remover when using, and the high temperature flue gas passes ceramic body 10 inside and outside wall and carries out the filtration of granule dust, because ceramic body 10 surface has the micropore, can carry out fine filtration to the granule dust through nanometer micropore. Meanwhile, the nano hydrophobic coating 20 is coated on the surface of the ceramic tube body 10, and the nano hydrophobic coating 20 conducts hydrophobic modification on the ceramic tube body 10 and the pore surface by increasing the roughness of the surface of the ceramic tube body 10, so that water drops are prevented from being adsorbed and condensed on the surface of the ceramic tube body 10.
In the scheme, the nano silicon dioxide modified by the fluorosilane is nano silicon dioxide modified by heptadecafluorodecyltriethoxysilane; the diameter of the alumina fiber is 5-15 μm, and the length of the monofilament is 5-30 mm; the adhesive is silica sol or polyimide, the silica sol is a dispersion liquid of silica particles in water or a solvent, the polyimide is one of organic high polymer materials with excellent comprehensive performance, the high temperature resistance reaches more than 400 ℃, the long-term use temperature range is 80-350 ℃, no obvious melting point exists, the high insulation performance is realized, and the stability in high-temperature smoke is good.
The high-temperature-resistant dehumidifying ceramic filter element can be prepared by the following steps:
step one, preparing a ceramic tube body, namely mixing alumina fibers, a binder and water, wherein the mass ratio of the alumina fibers to the binder is 1: 0.05-0.5, the addition of the water is based on the formation of plastic pug, adding the mixture into a mixing roll for mixing, uniformly mixing to form pug with certain plasticity, centrifuging the pug by using a knockout machine for high-speed rotation, uniformly beating the outside of the pug on a mold layer by using vacuum suction to form a filter element blank body, and drying to obtain the ceramic tube body;
step two, preparing nano silicon dioxide modified by fluorosilane, namely adding nano silicon dioxide powder into acetone for dispersion, sequentially adding heptadecafluorodecyltriethoxysilane and acetic acid solution, continuously stirring until the reaction is complete, centrifuging to obtain nano silicon dioxide modified by fluorosilane, and drying in vacuum at 130-145 ℃ to form powder;
step three, preparing a polyacrylate copolymer, namely forming a mixed solution I from methyl methacrylate, methyl acrylate, ethyl formate and butyl acrylate, uniformly stirring under the protection of nitrogen, adding benzoyl peroxide into butyl acetate to dissolve the benzoyl peroxide to prepare a mixed solution II, slowly adding the mixed solution II into the mixed solution I, heating to 75-85 ℃, and stirring for 1-3 hours to obtain the polyacrylate copolymer;
and step four, preparing a hydrophobic coating on the surface of the ceramic tube body, mixing the nano silicon dioxide modified by the fluorosilane obtained in the step two and the polyacrylate copolymer obtained in the step three according to the mass ratio of 1: 1-5, adding the mixture into butyl acetate to prepare a nano hydrophobic coating liquid, immersing the ceramic tube body obtained in the step one into the nano hydrophobic coating liquid, and compounding the nano hydrophobic coating on the surface of the ceramic tube body. In the step, in order to improve the composite effect of the nano hydrophobic coating and the ceramic tube body, the surface of the ceramic tube body can be corroded before the ceramic tube body is immersed in the nano hydrophobic coating liquid, and the ceramic tube body is slightly cleaned by 0.1mol/L sodium hydroxide solution.
Example one
The high-temperature-resistant dehumidifying ceramic filter element is prepared by the following steps:
step one, preparing a ceramic tube body, namely mixing alumina fiber, a binder and water, wherein the mass ratio of the alumina fiber to the binder is 1:0.05, adding appropriate amount of water, adding a mixing roll for mixing, uniformly mixing to form a pug with certain plasticity, centrifuging the pug by using a knockout machine for high-speed rotation, uniformly beating the outside on a mould layer by using a vacuum suction force to form a filter element blank body, and drying in a muffle furnace at 110 ℃ to obtain the ceramic tube body;
step two, preparing nano silicon dioxide modified by fluorosilane, namely adding 30g of nano silicon dioxide powder into 40ml of acetone for dispersion, sequentially adding 2ml of heptadecafluorodecyltriethoxysilane and 5ml of acetic acid solution, continuously stirring until the reaction is complete, centrifuging to obtain nano silicon dioxide modified by fluorosilane, and drying in vacuum at 145 ℃ to form powder;
step three, preparing a polyacrylate copolymer, namely forming a mixed solution I from 25ml of methyl methacrylate, 3ml of methyl acrylate, 3ml of ethyl formate and 25ml of butyl acrylate, uniformly stirring under the protection of nitrogen, adding 2ml of benzoyl peroxide into 5ml of butyl acetate to dissolve the benzoyl peroxide to prepare a mixed solution II, slowly adding the mixed solution II into the mixed solution I, heating to 85 ℃, and stirring for 2 hours to obtain the polyacrylate copolymer;
and step four, preparing a hydrophobic coating on the surface of the ceramic tube body, namely mixing the nano silicon dioxide modified by the fluorosilane obtained in the step two and the polyacrylate copolymer obtained in the step three according to the mass ratio of 1:1, adding the mixture into butyl acetate to prepare a nano hydrophobic coating liquid with the mass fraction of 20%, cleaning the ceramic tube body for 2min by using 0.1mol/L sodium hydroxide solution, washing the ceramic tube body by using water, immersing the ceramic tube body into the nano hydrophobic coating liquid, and coating the nano hydrophobic coating on the surface of the ceramic tube body.
And (3) mounting the ceramic pipe body with the nano hydrophobic coating compounded on the surface into a dust remover, and carrying out simulated smoke test. The simulated smoke comprises the following components: SO (SO)2 1000mg/m3NO is 1000mg/m3，O2Is 3% (by volume), H20.2 g/Nm/g of experimental dust with 20 percent (volume) of O and 10-25 mu m of grain diameter3The balance gas is nitrogen. The temperature of the simulated flue gas was 200 ℃. The concentration of each component in the gas after the reaction was measured in real time by a flue gas analyzer (of which only the dust removal efficiency was measured). After primary dust removal, the dust is removed four times by negative pressure back blowing, and after the temperature is reduced to normal temperature, the dust removal efficiency is tested by simulating smoke again.
Examples two to five
And (3) mixing the nano silicon dioxide modified by the fluorosilane in the fourth step and the polyacrylate copolymer obtained in the third step according to the mass ratio of 1:2, 1:3, 1:4 and 1:5, and keeping the other steps consistent with the embodiment.
Examples six to twelve
In contrast to the first example, the environmental temperatures of the flue gases of the sixth to tenth examples were 240 ℃, 280 ℃, 320 ℃, 360 ℃ and 400 ℃ respectively, and the environmental temperatures of the flue gases of the eleventh and twelfth examples were 80 ℃ and 160 ℃ respectively. The dust removal efficiency of each example is shown in table 1 below.
TABLE 1 dust removal efficiency of each example
| Dust removal efficiency (%) | One-time back flushing | Secondary back flushing | Triple back flushing | Four times of back flushing | |
| Example one | 95.0％ | 91.5％ | 90.5％ | 90.4％ | 90.4％ |
| Example two | 95.2％ | 91.5％ | 90.5％ | 90.5％ | 90.5％ |
| EXAMPLE III | 95.4％ | 91.6％ | 90.5％ | 90.5％ | 90.6％ |
| Example four | 95.4％ | 91.5％ | 90.5％ | 90.6％ | 90.7％ |
| EXAMPLE five | 95.3％ | 91.4％ | 90.5％ | 90.5％ | 90.6％ |
| EXAMPLE six | 95.1％ | 91.6％ | 90.6％ | 90.6％ | 90.7％ |
| EXAMPLE seven | 95.3％ | 91.7％ | 90.7％ | 90.7％ | 90.7％ |
| Example eight | 95.4％ | 91.6％ | 90.7％ | 90.6％ | 90.7％ |
| Example nine | 95.5％ | 91.6％ | 90.7％ | 90.7％ | 90.7％ |
| Example ten | 95.5％ | 91.6％ | 90.7％ | 90.6％ | 90.6％ |
| EXAMPLE eleven | 95.4％ | 91.3％ | 90.3％ | 90.4％ | 90.2％ |
| Example twelve | 95.2％ | 91.9％ | 90.5％ | 90.6％ | 90.5％ |
The analysis of the data can find that the dust removal efficiency is slightly improved by increasing the addition amount of the polyacrylate copolymer; the dust removal efficiency is reduced after one back flushing, probably because dust remains in micropores of the ceramic tube body, the dust removal efficiency is influenced; the water content in the flue gas environment reaches 20%, the high-temperature flue gas simulation is carried out again after the temperature is reduced to the normal temperature through back flushing, the dust removal efficiency is still stable, the crack defect influencing the dust removal efficiency is proved to be not generated by the ceramic pipe body from the side, and the hydrophobic effect of the nano hydrophobic coating prevents water drops from being generated on the surface of the ceramic pipe body; experiments show that the ceramic tube body with the nano hydrophobic coating compounded on the surface can still ensure stable dust removal efficiency at the temperature of 80-400 ℃.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (1)
1. The high-temperature-resistant dehumidifying ceramic filter element is characterized by comprising a ceramic tube body, wherein a nano hydrophobic coating is coated on the surface of the ceramic tube body, the nano hydrophobic coating is nano silicon dioxide modified by fluorosilane, the ceramic tube body is formed by mixing alumina fiber and a binder, and micropores are formed on the surface of the ceramic tube body, and the pore diameter of the micropores is 5-200 nm;
the nano silicon dioxide modified by the fluorosilane is nano silicon dioxide modified by heptadecafluorodecyltriethoxysilane;
the diameter of the alumina fiber is 5-15 μm, and the length of the monofilament is 5-30 mm;
the binder is silica sol or polyimide;
the preparation method of the high-temperature-resistant dehumidifying ceramic filter element comprises the following steps:
step one, preparing a ceramic tube body, namely mixing alumina fibers, a binder and water, adding the mixture into a mixing roll for mixing, uniformly mixing to form pug with certain plasticity, centrifuging the pug by using a knockout machine for high-speed rotation, uniformly beating the outside on a mould layer by using a vacuum suction force to form a filter element blank, and drying to obtain the ceramic tube body, wherein the mass ratio of the alumina fibers to the binder is 1: 0.05-0.5;
step two, preparing nano silicon dioxide modified by fluorosilane, namely adding nano silicon dioxide powder into acetone for dispersion, sequentially adding heptadecafluorodecyltriethoxysilane and acetic acid solution, continuously stirring until the reaction is complete, centrifuging to obtain nano silicon dioxide modified by fluorosilane, and drying the nano silicon dioxide modified by fluorosilane into powder in vacuum at the temperature of 130-145 ℃;
step three, preparing a polyacrylate copolymer, namely forming a mixed solution I from methyl methacrylate, methyl acrylate, ethyl formate and butyl acrylate, uniformly stirring under the protection of nitrogen, adding benzoyl peroxide into butyl acetate to dissolve the benzoyl peroxide to prepare a mixed solution II, slowly adding the mixed solution II into the mixed solution I, continuously stirring to obtain the polyacrylate copolymer, slowly adding the mixed solution II into the mixed solution I, heating to 75-85 ℃, and stirring for 1-3 hours to obtain the polyacrylate copolymer;
and step four, preparing a hydrophobic coating on the surface of the ceramic tube, mixing the nano silicon dioxide modified by the fluorosilane obtained in the step two and the polyacrylate copolymer obtained in the step three according to the mass ratio of 1: 1-5, adding the mixture into butyl acetate to prepare a nano hydrophobic coating liquid, immersing the ceramic tube obtained in the step one into the nano hydrophobic coating liquid, compounding the nano hydrophobic coating on the surface of the ceramic tube, and cleaning the ceramic tube by using a sodium hydroxide solution before immersing the ceramic tube into the nano hydrophobic coating liquid.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811051569.5A CN109481989B (en) | 2018-09-10 | 2018-09-10 | High-temperature-resistant dehumidifying ceramic filter element and preparation method thereof |
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| CN201811051569.5A CN109481989B (en) | 2018-09-10 | 2018-09-10 | High-temperature-resistant dehumidifying ceramic filter element and preparation method thereof |
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| CN109481989B true CN109481989B (en) | 2021-02-26 |
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| CN113577916B (en) * | 2021-07-12 | 2022-04-12 | 浙江致远环境科技有限公司 | Preparation process of ceramic composite fiber catalytic filter tube |
| CN114085099B (en) * | 2021-11-29 | 2023-01-13 | 佛山欧神诺陶瓷有限公司 | Surface hydrophobic ceramic and processing method thereof |
| CN115253489B (en) * | 2022-08-30 | 2023-07-14 | 金陵科技学院 | Ceramic filter element with double long-acting antibacterial performance and preparation method thereof |
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