CN102964124A - High-temperature gas-solid ceramic filter tube and preparation method - Google Patents

Abstract

The invention provides improvement of ceramic filter tubes for high-temperature gas purification, and is characterized in that a high-temperature binder for sintering comprises two or more than two of magnesium oxide, strontium oxide, calcium oxide, potassium oxide-containing minerals, kaolin or clay, and trace rare earth, and mainly forms a liquid-phase silicate high-temperature binder above 1200 DEG C. The contradiction between binding strength of a filter tube support body and filtration flux and resistance drop is well coordinated and solved; the obtained filter tube support body not only meets the requirements for transport, installation, and using strength, but also has a high filtration flux and low filtration resistance. When the filter tube has rupture strength of not less than 26 MPa, and a filtration flux of 55 m3/hm2, the resistance drop is 850-950 Pa or lower; the consistency for finished product batch production is good; and the performance difference is less than 10%.

Description

High temperature gas-solid ceramic filter tube and preparation method

Technical field

The present invention is that it is good to relate in particular to a kind of intensity to the improvement of high temperature gas cleaning with ceramic filter tube, and the high temperature gas-solid of high-throughput, low resistance separates with ceramic filter tube and preparation method.

Background technology

Integrated gasification combined cycle for power generation technology (IGCC), because heat utilization rate is high, soot emissions are almost 0 to be favored, and for example Chinese patent CN101880553A is described.Wherein the coal combustion hot air cleaning separates with high temperature gas-solid and use ceramic filter tube, is wherein key and important core element.Ceramic filter tube requires strainer tube at 300-900 ℃ of hot operation directly with the coal gas of high temperature filtration, purification in this technique, and for example design strength P of certain physical strength is arranged_Folding〉=24Mpa, do not rupture to satisfy in the transportation, installation and use (especially pressure bounce-back cleaning), and preferably cold and hot acute degeneration is arranged, very high filtering accuracy (0.5 micron 〉=99.8%), especially gas flux wants large resistance drop little, requires gas filtration flux 〉=55m³/ hm², pressure drop＜1000pa increases by 1% if filtration resistance is fallen, and the whole system energy consumption will increase by 1%, and larger on system's operation energy consumption impact, the at present horizontal pressure drop of domestic technique is usually about 1300pa.Aforementioned environment for use and requirement, so that this strainer tube manufacture difficulty, much larger than other use strainer tube usually, and objectively ceramic filter tube intensity and filtration flux and resistance itself are exactly conflict, intensity height, filtration resistance will inevitably increase flux and reduce, and this is a pair of contradiction that is difficult to overcome, therefore the industry technology personnel are making great efforts to overcome it, especially will be under proof strength minimizing strainer tube resistance drop as an emphasis research direction.

Can satisfy this filter tube support body that filters requirement in pottery has: silicon carbide material, mullite material, cordierite, silicon nitride material.The mullite heat-conductive characteristic is not as good as silicon carbide, and therefore cold and hot acute degeneration will be lower than silicon carbide; Trichroite, firing temperature is on the low side, and high-temperature machinery low strength, high temperature are not corrosion-resistant, are difficult to use in generally speaking working temperature 〉=600 ℃ filtration occasion; Silicon nitride because the granular size commodity are few, does not have the production in enormous quantities raw material supply, and raw material particle size need user prepares voluntarily, classification, thereby has increased manufacturing cost; Silicon carbide (SiC) wide material sources, the granular size commercialized degree is high, and is cheap, has higher heat-conductive characteristic, high physical strength and chemical stability, corrosion-resistant, thermal-shock resistance is good, therefore headed by selection matter.

The common firing temperature of filter tube support body that satisfies aforementioned service requirements all is greater than 1300 ℃, and silicon carbide material at least will be at 1350-1480 ℃, otherwise is difficult to guarantee applied at elevated temperature intensity.Yet oxidation occurs at 800-1200 ℃ in a weakness of SiC material easily, can generate relatively loose oxide film at particle surface in this temperature range, can not stop the continuation oxidation because this oxide film is loose, also can continue to the deep layer oxidation; Secondly, high temperature in the sintering process is so that particle surface is coated with the silicate liquid phase, and this liquid phase accelerates to have promoted the SiC surface oxidation especially, thereby makes SiC material strainer tube firing technology difficulty much larger than mullite, trichroite.In addition, the low melting point liquid-phase silicone hydrochlorate that produces, not only between 800-1200 ℃, liquid phase has promoted the SiC surface oxidation, and after 1200 ℃, this part liquid phase exists also can stop up runner, this be confirmed in the test of applicant's firing temperature (firing temperature improves, and percentage of open area, rate of air circulation descend) is although have higher physical strength after therefore goods burn till, but cause filtration flux to reduce, resistance is large.Prior art people avoid burning till the liquid-phase silicone hydrochlorate that forms cold state under the 800-1200 ℃ of temperature range, generally do not select to contain PbO, B₂O₃, Na₂The silicate minerals that the O equitemperature is lower is made binding agent, and adopts Al₂O₃The higher silicate bond of content is kaolin for example, but only keep self sintering state at the most of silicate bond of this temperature range, and lower with SiC particle surface cohesive force, causes product strength to reduce (Fig. 1).For guaranteeing certain physical strength, can only take more binder content to remedy, yet excessive many binding agents can cause again binding agent to occupy space between ceramic skeleton particle and particle, runner is narrowed down diminish, and many binding agents form molecule at the SiC particle surface and adhere to, so that the runner that forms between skeleton particle is rough, both all so that granuloplastic micropore runner reduce, viscosity factor is large, and resistance is large, does not reach low filtration resistance index request; Besides, many binding agents also can make binding agent itself form micropore (Fig. 2), water cleaned after filtration resistance increased in the use procedure, objectively can cause part water to be adsorbed in the binding agent microchannel, and the drying process after cleaning is not easy to discharge, and in use works as temperature and rises to more than the water vapor temperature, this part aqueous vapor expansion, can make binding agent produce tiny crack, several times use the cleaning crackle to enlarge and cause the calamitous fracture of strainer tube.

Above-mentioned prior art shows particularly SiC material filter tube support body, filtration flux, resistance and burn till cohesive strength contradiction outwardness, and be difficult to overcome, it is larger to seek the trim point difficulty, be to cause prior art to prepare SiC material strainer tube to be difficult to reach aforementioned IGCC technique high request, caused the intensity index height, filtration flux and Drag Indices standard reduce, otherwise intensity index is affected.

Chinese patent CN1341578 prepares the silicon carbide porous ceramic pipe method, adopts slip casting plaster mould moulding process, by regulating kind and the consumption of inorganic electrolyte, the pH value of regulating slurry 8-12 scope, viscosity between 20-35mpas, proportion is at 1.3-1.5g/cm³Between; Change void content and pore size and the distribution thereof of porous ceramic pipe by changing firing temperature.Yet injection forming owing to pH value and mud particle size reason, objectively for big-length (for example long 1000-2000mm) strainer tube product base substrate, is often gone up lower density and is differed larger, so that lower variation of tolerance is larger on the strainability in the slip casting process; Secondly, because the injection forming plaster mould is drawn moisture content, base substrate central authorities density is relatively poor, even forms layering, causes the strainer tube physical strength to reduce; Besides, the injection forming production cycle is relatively long.In addition, injection forming is the single face midge, there is the greater density gradient inside and outside the base substrate self, and the single face midge is often because mud property and suction time, model water-absorbent etc., cause the batch production thickness of pipe to have larger difference, thereby cause the goods strainability to produce larger difference, therefore prepare for the less employing slip casting of big-length strainer tube scale production plaster mould moulding process.Particularly unresolved for above-mentioned easy oxidation and binding agent existing problems.

Chinese patent CN1714909 method for preparing ceramic filter tube for purifying high temperature gas makes ceramic filter tube by making the ceramic filter tube of oxide compound liquid phase sintering agent → making take the SiC particle as main microtexture carrier → making mullite fiber film → film → sintering.Adopt principal constituent 70～90%Al₂O₃, be aided with 3.5～4.5%SiO₂, 1.5～3%CaO, 0.5～2%MgO, 0～1.5%Y₂O₃, 0～1.5%ZrO₂, 0～1.5%B₂O₃, 0～1.5%TiO₂, with 1350 ℃～1450 ℃ temperature sintering 2 hours in air, make oxide compound liquid phase sintering agent; Ceramic filter tube employing particle diameter is that 250～350 microns SiC particle 35～45%, 1000 purpose SiC powder 3.5～4.5%, oxide compound liquid phase formation agent 3.5～4.5%, potato powder 0.5～1.5%, ion exchanged water 35～45% is mixed and made into slurry, be poured into behind the plaster mould dryly, make length and be 1～1.5 meter, the tubulose shaping carrier of 55～65 millimeters of external diameters, 8～12 millimeter one end sealing of wall thickness.The shortcoming of above-mentioned employing injection forming still exists; Secondly, although by the standby binding agent frit of pre-burned, can form the liquidus temperature interval by the manual control binding agent, the technique relative complex, cost improves.

In addition, prior art prepares porous ceramics, mostly adopt the lower flour of self intensity, gac, graphite etc. as pore-forming material, this type of pore-forming material is not owing to have self geometrical shape and rigidity size, in mud refining, pressure molding process easily and binding agent lump together, do not have independent occupy-place effect, burning causes the part binding agent to stick in the silicon-carbide particle surface after losing pore-creating, and occupying runner increases filtration resistance.And burn to lose and also can cause binding agent minimizing on the site position between particle and particle, also can affect products machinery intensity.Therefore, test discovery through the applicant, aforementioned pore-forming material also is the very important factor that affects intensity and filtration resistance.

In addition, directly select relation from formation of structure micropore and particle, prior art is for satisfying the filtering accuracy requirement, form the micropore rule according to particle, the ceramic coating of supporting body surface filtration (for example satisfying the IGCC filtration uses), mostly adopt the general millipore filtration layer method of preparation, select 34 microns left and right sides particles as aggregates of meso-position radius by this pore size filter.Relatively large osseous granules is relatively large at the strainer tube surface area, causes the shared effective surface area of pore-forming to reduce, and test only has about 20% usually, and relatively low microporosity also is the another reason that causes filtration resistance large.With regard to filtration resistance (pressure drop), desirable low resistance strainer tube must be that supporter and surface micropore ceramic coating all have relatively low filtration resistance.

Summary of the invention

The object of the invention is to overcome above-mentioned the deficiencies in the prior art, and a kind of better supporter physical strength and filtration flux, resistance contradiction coordinated is provided, and has the intensity height, and filtration flux is large, filter the little high temperature gas-solid ceramic filter tube of pressure drop.

The high temperature gas-solid ceramic filter tube that provides a kind of filtration resistance less is provided.

A further object of the present invention is to provide the high temperature gas-solid method for preparing ceramic filter tube of a kind of above-mentioned high-throughput, low pressure drop.

The present invention's the first purpose realizes, the applicant is by seeking the existing reason that ceramic filter tube supporter intensity is low, filtration flux is little, resistance is large, the main improvement is SiC, mullite, porous cordierite supporter, select to adopt and mainly after 1200 ℃, form the relatively high binding agent of liquid phase and viscosity mineral composition high temperature silicate bond, thereby reach better sintered article cohesive strength and flux and the resistance contradiction coordinated, overcome the deficiencies in the prior art, realized the object of the invention.Specifically, high temperature gas-solid ceramic filter tube of the present invention, comprise silicon carbide or mullite or trichroite particle and sintering binder by preparation design mean pore size, through extrusion molding, the porous tubular support that sintering forms, and the micropore ceramics coating on surface, it is characterized in that sintering binder for contain magnesium oxide, strontium oxide, calcium oxide, two kinds of potassium oxide mineral or more than, with kaolin or clay and trace rare-earth mixing composition, the main high-temperature agglomerant that after 1200 ℃, forms liquid phase.

Before the detailed description, first by invention basic function and the effect that can reach are made a presentation, so that those skilled in the art have one clearly to understand to this patent general plotting technical scheme and the basic effect that reaches.

Because strainer tube maximum operating temperature of the present invention reaches 900 ℃, thereby hot strength and high temperature rigid that need to be enough, test shows that binding agent produces liquidus temperature greater than 1200 ℃, could effectively guarantee strainer tube the highest under 900 ℃ of environment external force recoil cleaning be difficult for deforming, comparatively ideal hot strength is arranged.And contain magnesium oxide, strontium oxide, calcium oxide, the fluxing mineral of potassium oxide, such as but not limited to talcum, rhombspar, magnesite, marble, Strontium carbonate powder, Wingdale, potassium felspar sand etc., the temperature that their produce liquid phase mostly＞1200 ℃, thereby effectively guaranteed the cohesive strength that applied at elevated temperature is enough, and it is relatively high to form liquid phase viscosity, high viscosity is so that the Liquid phase flowability reduction, add by common binder amount and use, substantially do not have many liquid phase obstructions or adhere to runner, so that granuloplastic runner maintenance is smooth, better having solved thus bonding physical strength and binding agent stops up, adhere to the road phenomenon, better coordinated bonding physical strength and filtration resistance, flux contradiction.For the SiC material, having reduced 800-1200 ℃ of temperature range has the silicate liquid phase of easy promotion SiC oxidation to produce, thereby has also effectively overcome the defective that the easy oxidation of SiC brings especially.Kaolin or clay are used for cooperating adjusting mixed silicate binding agent liquid phase to produce temperature and viscosity.Trace rare-earth is between 700-1200 ℃, impel the oxide film densification of SiC Surface Creation, cover the SiC particle surface, reduced at this temperature range SiC particle surface oxidative phenomena, nothing or less loose oxide film generation have improved the antioxidant property of SiC material between 800 ℃-1200 ℃.The high temperature of above-mentioned composition produces liquid phase and relatively full-bodied high-temperature agglomerant, mainly form bonding (Fig. 3) at the particle node that forms micropore, thereby guaranteed cohesive strength, make and burn till strainer tube and have higher physical strength, high viscosity has reduced flowability simultaneously, and need the amount of adding, so that substantially can not stop up and/or adhere to runner, make granuloplastic runner smooth free from worry, thereby has low filtration resistance, thereby better coordinated sintered bond intensity and filtration flux, resistance contradiction, realized the object of the invention.

Among the present invention.

Supporter pore-forming frame material, same prior art can be silicon carbide, also can be mullite, can also be trichroite, they have high physical strength and anti-rapid heat cycle, are conducive to guarantee the stability of strainer tube shape.The silicon carbide that has concurrently of over-all properties and economy more preferably wherein.For preferably pore structure is arranged, the better employing of particle shape does not contain flat or elongated piece (can by commercially available, or the ball milling shaping obtains).Selecting of particle median size depending on the requirement of filter tube support body aperture, prepares many micropores supporter by prior art and determines that the particle diameter method is definite, for example designs supporting tube mean pore size 30-40 micron, average size of aggregate 180-250 micron, and this belongs to prior art.

High-temperature agglomerant, be mainly used in making the inter-adhesive generation intensity of pore-forming particle, by contain magnesium oxide, strontium oxide, calcium oxide, two kinds of potassium oxide mineral or more than, with kaolin or clay and trace rare-earth composition, make it mainly after 1200 ℃, form liquid phase, and form liquid phase and have relatively high viscosity (thickness liquid phase), particle is bondd, become vitreum after the cooling, formed physical strength.Its middle-weight rare earths can adopt the mishmetal of commercially available low price, and the rare earth of certainly purifying can be employed equally, its consumption with usually in pottery, use similar, for trace for example 0.2-0.5 divide, meet the demands.The consumption of binding agent, similar with common preparation porous ceramics consumption, for example account for the 18-25wt% of total raw material amount.

For obtaining the less ceramic filter tube of filtration resistance, supporting tube surface ceramic coat skeleton particle, test and Selection better adopts less than conventional way, for example be used for IGCC technique strainer tube coating particles, select the meta particle diameter to reduce to the 10-25 micron by about 34 microns, add in addition 5-10wt%Al (OH)₃Although the ceramic coating particle directly reduces, owing to adopted the labile Al of pyroprocess (OH)₃Occupy-place when moulding is burnt till decomposition at high temperature and is stayed hole, although so that actual pore-forming adopts relative macrobead formation hole slightly less than normal than prior art, because Al (OH)₃Moulding occupy-place and high temperature burn to lose so that the porosity showed increased can reach about 25% after tested, thereby so that filtration resistance is able to further minimizing, filtration flux increases.

Supporter top layer ceramic coating particle, mainly only bear pore-forming and filter barrier effect, therefore only need be chosen in the ceramic aggregate that melting does not occur in the sintering process such as prior art, the corundum of for example commonly using, silicon carbide, mullites etc. are wherein better selected the good corundum of particle commercialization or silicon-carbide particle.

The said grain diameter of the present invention, identical with common ceramic process particle diameter statement, be not to refer to that whole particles are consistent size, but usually be normal distribution particle footpath form of presentation, and concrete particle diameter is determined to be required to determine that by existing preparation porous ceramics method this is prior art for those skilled in the art by the design aperture.

Method for manufacturing high-temperature gas-solid separation of the present invention, comprise by silicon carbide or mullite or trichroite particles of aggregates and sintering binder and pore-forming material, the moulding of molding adhesive extrusion, be higher than 1300 ℃ of high temperature sinterings and make porous supporting body, apply the ceramic size sintering and obtain to filter coating, it is characterized in that the sintering binder employing has the magnesium oxide of containing, strontium oxide, calcium oxide, two kinds of potassium oxide mineral or more than, with kaolin or clay and trace rare-earth mixing composition, the main high-temperature agglomerant that after 1200 ℃, forms liquid phase, pore-forming material is by comprising usually with pore-forming material and amount, forms with the walnut shell particle that adds 3-5 part particle diameter and be substantially equal to the design mean pore size.

Used usually with pore-forming material and amount in the inventive method, similar with pore-forming material with existing preparation porous ceramics, be mainly used in the occupy-place pore-forming, they are such as being usually to use the pore-forming materials such as flour, gac, graphite, and/or the auxiliary agent that possesses simultaneously pore-creating function and moulding is such as but not limited to methylcellulose gum, aluminum stearate, polyvinyl alcohol, yellow starch gum etc., also to prepare porous ceramics similar with prior art for its consumption, for example prepare IGCC and account for the 8-15wt% of total amount with strainer tube, specifically look the requirement of design hole and determine.

In the inventive method, also comprise in the pore-forming material and add the walnut shell particle that 3-5 part particle diameter is approximately equal to the design mean pore size, because walnut shell particle not only has relatively high physical strength and rigidity, before burning till, be equivalent to the less ridge particle of particle diameter, can guarantee in mud refining, pressure forming process not broken, and volume expands variation hardly after the suction (mud refining), keep original-shape, keep former occupy-place volume, be conducive to control and the preparation in design requirements aperture, and be bordering on the spheroidal particle shape, lose comparatively ideal of rear pore-forming so that burn.In the moulded pottery not yet put in a kiln to bake moulding process, occupy between the skeleton particle simultaneously, high-temperature agglomerant is clamp-oned around particle and the space, intergranular site position, both stayed comparatively desirable hole after burning mistake, high-temperature agglomerant is connected on the site position of particle and particle, the unobstructed cohesive strength of runner is improved, overcome the deficiency of existing employing low strength pore-forming material.The walnut shell particle particle diameter is selected, and is roughly similar with requirement pore-forming aperture, and for example IGCC filter tube support body of the present invention is selected 260-400 order particle diameter walnut shell particle.

In addition, for being conducive to the moulding bonding, also be added with part molding adhesive material with prior art.Extrusion molding is same prior art also, and these are prior art, and those skilled in the art can both understand, repeat no more.

IGCC of the present invention is with filter tube support body composition and ratio and ceramic for filtration coating proportioning, sees Table respectively 1, table 2.

During supporter formed, aluminum stearate, Vltra tears, polyvinyl alcohol both as pore-forming material, also were molding adhesives simultaneously.

In the ceramic for filtration coating: emergy W₁₄Be the top coat aggregate, wilkinite, potassium felspar sand, white glass powder are high-temperature agglomerant; Carboxymethyl cellulose, corrosive acid sodium are the mud auxiliary material, AL (OH)₃Be pore former.

High temperature gas-solid ceramic filter tube of the present invention and manufacture method, with respect to prior art, owing to improved the supporter high-temperature agglomerant, select to adopt and mainly after 1200 ℃, form liquid phase and the relatively high high-temperature agglomerant of viscosity, and reduce ceramic for filtration coating particles size, add 5-10wt%Al (OH)₃Add 3-5 part walnut shell particle pore-forming material with employing.Not only better coordinate to have solved filter tube support body cohesive strength and filtration flux and resistance drop contradiction, the gained filter tube support body had both had satisfied transportation, installation, service requirements intensity, binding agent does not stop up runner again, also adhered particles is not surperficial, thereby it is smooth to form runner, has than high filtration flux and low filtration resistance.Increase rigidity walnut shell particle pore-forming material, stable particle form burns to lose and forms that micropore is constant to be equivalent to former occupy-place volume micropore, and makes the more and particle bond of binding agent, has guaranteed enough cohesive strengths.Gained supporter intensity P_Anti-folding〉=26MPa, than the high 2MPa of currently available products, void content reaches 34-38%, than the high 3-6% of prior art products.Filter and use ceramic coating, more similarly reduced particles of aggregates directly, and adopt a small amount of AL (OH)₃Micro mist, high temperature burn till sloughs water of constitution formation AL₂O₃, stay the space and form micropore, with particles of aggregates (W for example₁₄Corundum) cooperate formation 8-10 micron micropore, surface spraying layer thickness 20-25 μ m, tradition does not add AL (OH)₃It is little and many to form micropore, and the little 1-2 μ of more similar best product m, void content are up to 30-32%, and surface filtration hole useful area increases, thereby has increased the gas filtration area, has also promoted the filtration resistance reduction.Strainer tube of the present invention, folding strength 〉=26Mpa, filtration flux 55m³/ hm²The time, resistance is reduced to 850-950pa or lower, has simultaneously high physical strength and low filtration resistance (pressure drop), is better than existing domestic report best level, and finished product batch production high conformity, and performance difference is less than 10%.Because reduce in the filtering micropore aperture, filtering accuracy improves, and also helps to reduce to filter dust to the obstruction of micropore, can also prolong life cycle and life-span.The inventive method can not only be used for the manufacturing of high temperature gas-solid separator tube, can also be used for having the manufacturing of similar operating mode strainer tube.Supporting tube of the present invention can be differentiated binding agent by Tonghua Epidemiological Analysis, and can show that binding agent mainly in particle node bonding (Fig. 3), can be different from the strainer tube that other prior aries are made by the crystalline phase photo.

Below in conjunction with three specific embodiments; essence of the present invention is further understood in exemplary illustration and help; but the embodiment detail only is for the present invention is described; do not represent the present invention and conceive lower whole technical scheme; therefore should not be construed as the technical scheme restriction total to the present invention, some are In the view of the technician, and the unsubstantiality that does not depart from the present invention's design increases and/or change; for example simple the change or replacement of technical characterictic to have same or similar technique effect all belongs to protection domain of the present invention.

Description of drawings

Fig. 1 is the SiC supporter crystalline phase photo of prior art preparation, shows not melting of binding agent.

Fig. 2 is the SiC supporter crystalline phase photo of prior art preparation, shows that binding agent too much occupies runner, and the inner micropore that forms.

Fig. 3 is the SiC supporter crystalline phase photo that the present invention prepares, and shows the binding agent melting, and mainly in particle and particle node bonding, binding agent inside does not contain little pore, and runner is smooth.

Embodiment

Embodiment: the preparation method is with preparation porous filtering pipe method is identical usually, and body, sintering are supported in first preparation, then adopt to soak or spray to apply coating, again sintering.

The supporter preparation: press the embodiment table, weigh batching → mixing pugging (making plastic mud material) → extrusion molding → drying → burn till (1350-1400 ℃ is incubated 4-6 hour) obtains mean pore size 30-40 micron silicon carbide material porous tubular support.Wherein, silicon-carbide particle median size 200-250 μ m, walnut shell particle material 260-400 order, binding agent mineral material≤300 orders, polyvinyl alcohol are 1:9 glue liquid.

Ceramic capillary coating preparation: press the embodiment table, weigh batching → mixing and ball milling (obtaining stable and the suspension liquid that is uniformly dispersed) → spraying or dip-coating (coat-thickness 20-25 micron) → drying → burn till (1260 ℃-1280 ℃, be incubated 3-4 hour), obtaining mean pore size is the filtration coating of 8-10 micron.

To those skilled in the art; under this patent design and specific embodiment enlightenment; some distortion that can directly derive or associate from this patent disclosure and general knowledge; those of ordinary skills will recognize also can adopt additive method; or the substituting of known technology commonly used in the prior art; and the equivalence of feature changes or modification; mutual various combination between feature; for example the supporter frame material also can adopt mullite or trichroite; ceramic coating also can adopt other high temperature resistant frame materials; the binding agent Mineral change; etc. unsubstantiality change, can be employed equally, can both realize this patent representation function and effect; launch for example no longer one by one to describe in detail, all belong to this patent protection domain.

Claims (10)

1. high temperature gas-solid ceramic filter tube, comprise silicon carbide or mullite or trichroite particle and sintering binder by preparation design mean pore size, through extrusion molding, the porous tubular support that sintering forms, and the micropore ceramics coating on surface, it is characterized in that sintering binder for contain magnesium oxide, strontium oxide, calcium oxide, two kinds of potassium oxide mineral or more than, and kaolin or clay and trace rare-earth mix and form the main high-temperature agglomerant that forms liquid phase after 1200 ℃.

2. described high temperature gas-solid ceramic filter tube according to claim 1 is characterized in that the supporter frame material is silicon carbide.

3. described high temperature gas-solid ceramic filter tube according to claim 1 is characterized in that particle shape is not for containing flat or elongated piece.

4. described high temperature gas-solid ceramic filter tube according to claim 1 is characterized in that supporting tube mean pore size 30-40 micron, adopts average size of aggregate 180-250 micron.

5. described high temperature gas-solid ceramic filter tube according to claim 1 is characterized in that the high-temperature agglomerant consumption accounts for the 18-25wt% of total raw material amount.

6. described high temperature gas-solid ceramic filter tube according to claim 1 is characterized in that supporting tube surface ceramic coat skeleton particle meta particle diameter 10-25 micron, adds 5-10wt%Al (OH)₃

7. the described high temperature gas-solid ceramic filter tube of arbitrary claim in 6 according to claim 1 is characterized in that strainer tube folding strength 〉=26Mpa, filtration flux 55m³/ hm²The time, resistance is reduced to 850-950pa or lower.

8. method for manufacturing high-temperature gas-solid separation, comprise by silicon carbide or mullite or trichroite particles of aggregates and sintering binder and pore-forming material, the moulding of molding adhesive extrusion, be higher than 1300 ℃ of high temperature sinterings and make porous supporting body, apply the ceramic size sintering and obtain to filter coating, it is characterized in that the sintering binder employing has the magnesium oxide of containing, strontium oxide, calcium oxide, two kinds of potassium oxide mineral or more than, with kaolin or clay and trace rare-earth mixing composition, the main high-temperature agglomerant that after 1200 ℃, forms liquid phase, pore-forming material is by comprising usually with pore-forming material and amount, forms with the walnut shell particle that adds 3-5 part particle diameter and be substantially equal to the design mean pore size.

9. described method for manufacturing high-temperature gas-solid separation according to claim 8 is characterized in that walnut shell particle median size 260-400 order.

10. according to claim 8 or 9 described method for manufacturing high-temperature gas-solid separations, it is characterized in that 1350-1400 ℃ of supporter firing temperature, 1260 ℃-1280 ℃ of coating firing temperatures.

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