CN104492275A - Method for preparing asymmetric microporous ceramic filter tube membrane by thermal spraying - Google Patents
Method for preparing asymmetric microporous ceramic filter tube membrane by thermal spraying Download PDFInfo
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- CN104492275A CN104492275A CN201410698988.3A CN201410698988A CN104492275A CN 104492275 A CN104492275 A CN 104492275A CN 201410698988 A CN201410698988 A CN 201410698988A CN 104492275 A CN104492275 A CN 104492275A
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Abstract
The invention discloses a method for preparing an asymmetric microporous ceramic filter tube membrane by thermal spraying. Metallurgy industrial high-temperature flue gas is treated by the asymmetric microporous ceramic filter tube membrane prepared by thermal spraying so that dust discharge amount problem is solved and PM 2.5 pollution effects are reduced. The asymmetric microporous ceramic filter tube has a three-layer structure, the inner layer is a microporous ceramic filter tube matrix prepared by an isostatic compaction technology, has a large average aperture size and ensures filter tube strength, the middle layer is a ceramic fiber layer and is used as a transition connection layer for ensuring good connection between the support matrix and a surface membrane, the outer layer is a small-average particle size separating membrane prepared by thermal spraying coating, and the ceramic tube surface aperture sizes are in a range of 0.5-2.5 microns so that solid particle surface filtration is realized. The microporous ceramic filter tube has the advantages of high temperature resistance, high moisture resistance, acid and alkali resistance, wear resistance, bonding resistance, small filtering resistance, large filtration yield, low operation cost, long service life, high filtration accuracy, good mechanical properties and good stability and can substantially reduce an industrial dust discharge capacity.
Description
Technical field
The invention belongs to iron and steel energy-saving and emission-reduction and industrial smoke process engineering field, relate in a kind of steel manufacture process the energy-conserving and emission-cutting technology that exhaust gas dust filters, a kind of method adopting thermal spraying to prepare asymmetric filter mantle film is provided, metallurgy industry PM2.5 can be reduced and pollute.
Technical background
PM2.5 pollutes and the haze phenomenon of each department has become the environmental protection focus paid close attention to both at home and abroad.From the industry that dust produces, the dust generating capacity of metallurgy industry and can not be ignored the pollution of air ambient, the especially pollution of fine solid particle, can cause very large harm to health.
The high-temperature dust removal technology that current metallurgy industry adopts mainly contains: bag-type dust, electric precipitation, cyclone dust removal, wet dust removal.Wherein sack cleaner uses the most extensive, Applicable temperature scope is 80 DEG C-260 DEG C, efficiency of dust collection is very high, process air quantity is large, floor space is little, but shortcoming also clearly: sack cleaner body resistance is large, can burn under its fibrous material high temperature, require to control the temperature of flue gas in the scope that filter bag can bear, present most dust settling pockets can not at high temperature work, and are difficult to treatment temperature higher than the gas of 300 DEG C.The use of electrostatic precipitator is also comparatively extensive, its efficiency of dust collection is high, resistance is little, energy consumption is low, can use in flue gas below 400 DEG C, and automaticity is high, operating cost is low, maintenance workload is little, but under there is HTHP, corona phenomenon is difficult to maintain, electrode life is short, responsive to smoke components, manufacture and the difficult problem such as installation requirement is high, in short time, still Industrial demonstration can not be carried out.Cyclone dust removal due to its efficiency of dust collection not high, only can remove the dust-laden particle of more than 15 μm, outlet dust content be less than 100mg/Nm
3.Therefore, cyclone dust collectors far can not meet the requirement to dust of gas turbine, can only as pre-cleaner.Although water film dedusting structure is simple, metal consumption is little, and water consumption is little.But it is highly comparatively large, difficult arrangement, and finds that there is water phenomenon in actual motion, and amount of heat can not reclaim, and therefore uses less.
High Temperature Ceremic Filtering Technique has been known as the filtering technique of most development prospect as the key technology of 21st century by various countries.But the homogeneous porous ceramics developed now and conventional ceramic diffusion barrier all face the problem that pore-size distribution is wayward, the rate of filtration is low, service life is lower and thermal shock resistance is not high in high temperature gas cleaning.Homogeneous Porosity of Porous Ceramics is low, and the rate of filtration cannot meet the speed of industrial filter flue gas requirement.Conventional ceramic diffusion barrier can do very thin due to separation membrane layer, filtration resistance significantly reduces, but due to the porosity general lower (≤45%) of diffusion barrier, though its rate of filtration is more much bigger than the homogeneous porous ceramics with aperture, but still the requirement of commercial Application can not be met, and its thermal shock resistance is preferably 900 DEG C, be difficult to the rapid heat cycle destruction that satisfied more than 900 DEG C high temperature air filtrations bring with the blowback of opposing frequent pulse cold air, therefore, need development thermal shock resistance better, apparent porosity is high, pore-size distribution is controlled, the refractory ceramics filtering material that the rate of filtration is higher.
Summary of the invention
Target of the present invention is the problem and shortage that will solve traditional dedusting technology, a kind of method adopting thermal spraying to prepare asymmetric filter mantle film is provided, isostatic pressing process is adopted to prepare micropore ceramics membrane filter tube matrix, novelty overlay film on matrix, again after thermal spraying high-temperature process, obtain new three-decker composite ceramics and filter periosteum.Micropore ceramics membrane filter tube adopts three-decker, the micropore ceramics membrane filter tube matrix that internal layer adopts isostatic pressing process to prepare, average pore size is larger, guarantee the intensity of screen pipe, centre is ceramic fiber layer, is transition articulamentum, guarantee the good connection of support substrate and skin covering of the surface, outer employing thermal spraying overlay film, obtains the diffusion barrier that one deck average grain diameter is less, to realize the surface filtration of solid particle.This asymmetric aperture becomes the sandwich construction of graded, is exactly the difference of itself and traditional porous ceramics.The object forming micropore size graded reduces pressure loss when filtering, and what really play isolated by filtration effect is superficial film.The ceramic functional membrane screen pipe of this multilayer just becomes both surface filtration in-depth filtration, and under the prerequisite ensureing filtering accuracy, filtration resistance is significantly reduced, and aperture reduces further, and thermal shock resistance is also strengthened.The micropore ceramics membrane filter tube that patent of the present invention obtains has high-temp resisting high-humidity resisting, acid and alkali-resistance, the mechanical performance that wear-resistant, anti stick, filtration resistance are little, filtering accuracy is high and good and stability, significantly reduces industrial dust discharged amount, reduces PM2.5 and pollutes.
Concrete feature of the present invention is:
1) after thermal spraying overlay film, earthenware surface apertures can reach 0.5 ~ 2.5 μm, solves dust discharge amount, reduces PM2.5 and pollutes; 2) density is 860 ~ 1480kg/m
3, the porosity is 30 ~ 45%, and inner average pore size is less than 100 μm, the pressure loss≤2000Pa (filtration flow-rate is 0.8 ~ 1.1m/min), has the membrane interface combination of good porosity, pore radiuses and distribution, optimization; 3) compression strength>=2.5MPa, product service life>=5 years, production cost and operating cost lower; 4) traditional dedusting method such as sack cleaner, electrostatic precipitation can be replaced completely.
Accompanying drawing explanation
Accompanying drawing prepares asymmetric filter mantle membrane process flow chart for adopting thermal spraying.
This patent comprises matrix 1, capillary force eliminates system 2, mullite suspension raw material 3, soaking paste pond 4, drier 5, sintering furnace 6, thermal spray system 7, detection system 8, asymmetric filter mantle film 9.
Technical process first burns till tubular macroporous ceramic filter matrix 1 by isostatic compaction.The manufacturing process of matrix 1 is to inorganic material, the additive raw materials such as such as carborundum, aluminium oxide, zirconia, rare earth carry out presintering and sieve after being ground into particle, obtain the aggregate of variable grain grade, add pore creating material and adhesive, after ball milling, drying and screening, mixing, adopt isostatic compaction to burn till tubular macroporous ceramic filter matrix 1.First matrix 1 is carried out pretreatment, eliminate system 2 by capillary force and eliminate a part of capillary force.Be placed in soaking paste pond 4 by mullite suspension raw material 3 and stir, mullite suspension 3 forms primarily of powder, solvent, dispersant, adhesive and plasticizer.Then micropore ceramic filter matrix 1 is immersed in soaking paste pond 4, coating is formed under the effect of capillary force and stickiness power, after soaking paste, dry at drier 5, obtain porous surface film after being sintered by sintering furnace 6, then return to soaking paste pond 4, by soaking paste repeatedly, after drying reaches required film thickness, then thermal spray system 7 is adopted to carry out pyrolytic coating.Micropore ceramics after spraying is detected by the detection systems such as ESEM 8, finally makes asymmetric filter mantle film 9.
Detailed description of the invention
The present invention can run simultaneously in 2 to 15 deduster parallel connections, also can adopt that to open 1 received shipment capable more.Separate unit micropore ceramics dust remover comprises the ash discharging hole etc. below conveying worm below support, manhole upper box, smoke inlet, pure qi (oxygen) outlet, ash bucket, ash bucket and dust discharge valve, dust discharge valve, be the asymmetric filter mantle of 0.5 ~ 50 μm at upper box built with 80 ~ 800 root hole footpaths, its length is 500 to 2000 millimeters, internal diameter 60 to 300 millimeters.Micropore ceramics dust remover system can reach 20000m to the treating capacity of high-temperature flue gas
3/ h, to filter efficiency>=99% of dust.
The system parallel running of 1.4 micropore ceramics dust removers, be the asymmetric filter mantle of 0.5 ~ 50 μm at upper box built with 500 root hole footpaths, its length is 1200 millimeters, internal diameter 240 millimeters.Passing into high-temperature flue gas flow is 800m
3/ h, flue gas pressures is 2.0MP, and recording dust efficiency of dust collection is 99.3%.
The system parallel running of more than 2.8 micropore ceramics dust removers, be the asymmetric filter mantle of 0.5 ~ 50 μm at upper box built with 600 root hole footpaths, its length is 1500 millimeters, internal diameter 270 millimeters.Passing into high-temperature flue gas flow is 1200m
3/ h, flue gas pressures is 2.0MP, and recording dust efficiency of dust collection is 99.1%.
Claims (3)
1. the method adopting thermal spraying to prepare asymmetric filter mantle film, asymmetric filter mantle adopts three-decker, internal layer is the micropore ceramics membrane filter tube matrix adopting isostatic pressing process to prepare, and average pore size is comparatively large, guarantees the intensity of screen pipe, centre is ceramic fiber layer, be transition articulamentum, guarantee the good connection of support substrate and skin covering of the surface, outer employing thermal spraying overlay film, obtain the diffusion barrier that one deck average grain diameter is less, to realize the surface filtration of solid particle.After asymmetric filter mantle assembling parallel connection, for the process of metallurgical industry high-temperature flue gas, reach solution dust discharge amount, reduce the effect that PM2.5 pollutes.
2. in accordance with the method for claim 1, the micropore ceramics surface apertures after thermal spraying overlay film can reach 0.5 ~ 2.5 μm, reduces the aperture of traditional dedusting ceramic, increases porosity, and the porosity is 30 ~ 45%, and density is 860 ~ 1480kg/m
3inner average pore size is less than 100 μm, the pressure loss≤2000Pa, obtains the asymmetric filter mantle of high-temp resisting high-humidity resisting, acid and alkali-resistance, the mechanical performance that wear-resistant, anti stick, filtration resistance are little, filtering accuracy is high and good and stability for the treatment of metallurgy high temperature fume high-temperature flue gas.
3. in accordance with the method for claim 1,80 ~ 800 asymmetric filter mantles are inserted in every platform micropore ceramics dust pelletizing system, by the parallel running of multiple stage micropore ceramics dust pelletizing system, the treating capacity of industrial smoke can be met, to filter efficiency >=99% of dust.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105199751A (en) * | 2015-08-31 | 2015-12-30 | 北京大学 | Method for combining coke physical-heat utilization and micropore ceramic dust removing |
| CN105935515A (en) * | 2016-06-23 | 2016-09-14 | 无锡市国松环保机械有限公司 | Nano composite filter membrane for purification tower |
| CN105935528A (en) * | 2016-06-23 | 2016-09-14 | 无锡市国松环保机械有限公司 | Filter membrane for secondary dedusting of industrial boiler flue gas |
| CN107174883A (en) * | 2017-07-24 | 2017-09-19 | 苏州宏久航空防热材料科技有限公司 | One kind has top layer net distribution silicon carbide nanometer line filtration |
| CN108939697A (en) * | 2017-05-18 | 2018-12-07 | 山东工业陶瓷研究设计院有限公司 | A kind of the high-temperature ceramic fibre filter element and preparation method of continuous fiber reinforcement |
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| CN103316595A (en) * | 2012-03-18 | 2013-09-25 | 殷雄 | Asymmetrical tubular ceramic membrane and preparation method thereof |
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2014
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103316595A (en) * | 2012-03-18 | 2013-09-25 | 殷雄 | Asymmetrical tubular ceramic membrane and preparation method thereof |
Non-Patent Citations (1)
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| 袁章福等: "冶金烟气微孔陶瓷管膜研制及深度除尘应用的研究", 《有色金属科学与工程》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105199751A (en) * | 2015-08-31 | 2015-12-30 | 北京大学 | Method for combining coke physical-heat utilization and micropore ceramic dust removing |
| CN105935515A (en) * | 2016-06-23 | 2016-09-14 | 无锡市国松环保机械有限公司 | Nano composite filter membrane for purification tower |
| CN105935528A (en) * | 2016-06-23 | 2016-09-14 | 无锡市国松环保机械有限公司 | Filter membrane for secondary dedusting of industrial boiler flue gas |
| CN108939697A (en) * | 2017-05-18 | 2018-12-07 | 山东工业陶瓷研究设计院有限公司 | A kind of the high-temperature ceramic fibre filter element and preparation method of continuous fiber reinforcement |
| CN108939697B (en) * | 2017-05-18 | 2021-03-16 | 山东工业陶瓷研究设计院有限公司 | Continuous fiber reinforced high-temperature ceramic fiber filter element and preparation method thereof |
| CN107174883A (en) * | 2017-07-24 | 2017-09-19 | 苏州宏久航空防热材料科技有限公司 | One kind has top layer net distribution silicon carbide nanometer line filtration |
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Application publication date: 20150408 |