WO2012121262A1 - グリーンハニカム成形体の乾燥方法及び乾燥装置 - Google Patents
グリーンハニカム成形体の乾燥方法及び乾燥装置 Download PDFInfo
- Publication number
- WO2012121262A1 WO2012121262A1 PCT/JP2012/055724 JP2012055724W WO2012121262A1 WO 2012121262 A1 WO2012121262 A1 WO 2012121262A1 JP 2012055724 W JP2012055724 W JP 2012055724W WO 2012121262 A1 WO2012121262 A1 WO 2012121262A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- molded body
- honeycomb molded
- green honeycomb
- gas
- dispersion plate
- Prior art date
Links
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Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/36—Glass starting materials for making ceramics, e.g. silica glass
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5436—Particle size related information expressed by the size of the particles or aggregates thereof micrometer sized, i.e. from 1 to 100 micron
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5445—Particle size related information expressed by the size of the particles or aggregates thereof submicron sized, i.e. from 0,1 to 1 micron
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B2210/00—Drying processes and machines for solid objects characterised by the specific requirements of the drying good
- F26B2210/02—Ceramic articles or ceramic semi-finished articles
Definitions
- the present invention relates to a drying method and a drying apparatus for a green honeycomb molded body.
- Patent Document 1 discloses a method using a microwave and heated gas as a method for drying a green honeycomb molded body.
- the green honeycomb molded body may be deformed or cracked during drying.
- the present invention has been made in view of the above problems, and an object thereof is to provide a drying method and a drying apparatus for a green honeycomb molded body that can suppress deformation and cracking of the green honeycomb molded body during drying.
- the present invention is a method for drying a green honeycomb molded body having a plurality of through-holes with microwaves and heated gas, the step of placing the green honeycomb molded body on a gas dispersion plate capable of releasing heated gas; A step of irradiating the green honeycomb molded body with microwaves at the same time supplying a heated gas through the gas dispersion plate to each through hole of the green honeycomb molded body in an atmosphere where water vapor exists around the green honeycomb molded body, Prior to supplying heated gas and irradiating with microwaves, a sealing member that prevents the heated gas from the gas dispersion plate from hitting the outer peripheral wall of the green honeycomb molded body outside the end of the green honeycomb molded body on the gas dispersion plate side. Is provided.
- the present invention also relates to a drying apparatus for a green honeycomb molded body having a plurality of through holes, a container, a microwave source that supplies a microwave into the container, and a heated gas source that supplies a heated gas into the container.
- An apparatus is provided that includes a dispersion plate and a seal member that is disposed outside the end of the green honeycomb molded body on the gas dispersion plate side and prevents heated gas from the gas dispersion plate from hitting the outer peripheral wall of the green honeycomb molded body. To do.
- the region (gas release region) from which the heated gas is released in the gas dispersion plate is larger than the end face of the green honeycomb molded body, a portion of the gas release area that is not covered by the end face of the green honeycomb molded body is covered with the seal member. It is preferable to close it.
- the green honeycomb molded body is likely to be deformed in the initial drying stage where a large amount of solvent remains. As described above, by preventing the heated gas from being released from the portion not covered by the end face of the green honeycomb molded body, deformation in the initial drying stage can be effectively suppressed, and deformation and cracking of the molded body can be more reliably performed. Can be suppressed.
- the sealing member is preferably made of a material that can follow the shrinkage associated with drying of the green honeycomb molded body. For example, in the initial stage of drying, even if the end face of the green honeycomb molded body is entirely covered with the end face of the green honeycomb molded body, the area of the end face of the green honeycomb molded body becomes smaller as the drying proceeds. There is a case.
- a seal member capable of following the shrinkage of the green honeycomb molded body it is possible to sufficiently prevent the heated gas from leaking from the region to the outside of the green honeycomb molded body being dried. Thereby, it can prevent more reliably that the outer peripheral wall of a green honeycomb molded object dries excessively.
- the following problems can be effectively prevented by using a sealing member made of the above-mentioned material. That is, since the through-holes of the green honeycomb molded body have a relatively large pressure loss, when the gas release region is exposed as the green honeycomb molded body contracts, a large amount of heated gas flows from the region to the outside of the molded body. The amount of gas flowing through the body's through holes tends to be small. In such a situation, the inside of the molded body becomes insufficiently dried, and problems such as cell crushing and cracking of the molded body occur in a process (for example, a cutting process) after drying.
- the present invention it is possible to provide a drying device and a drying method for a green honeycomb molded body that can suppress deformation and cracking of the green honeycomb molded body during drying.
- FIG. 1A is a schematic cross-sectional view of the drying apparatus according to the first embodiment
- FIG. 1B is a perspective view of the seal member 80 of FIG.
- FIG. 2 is a perspective view showing an example of a green honeycomb molded body.
- FIG. 3 is a perspective view showing another example of a green honeycomb molded body.
- FIG. 4 is a schematic cross-sectional view of a drying apparatus according to the second embodiment.
- FIG. 5 is a top view of the mounting table 40 of the drying apparatus according to the second embodiment.
- 6A is a perspective view showing a state in which the green honeycomb molded body and the torch are integrated by the sealing member
- FIG. 6B is a perspective view showing the dried molded body and the torch.
- a preferred embodiment of a drying apparatus for a green honeycomb molded body according to the present invention will be described with reference to FIG.
- the same reference numerals are used for the same elements or elements having the same function, and a duplicate description is omitted.
- the drying device 100 for a green honeycomb molded body is for drying the green honeycomb molded body 70, and mainly includes a container 10, a microwave source 20 that supplies a microwave into the container 10, and a container 10.
- the green honeycomb molded body 70 to be dried will be described.
- the green honeycomb molded body 70 according to the present embodiment is a pillar body having a large number of through holes 70a extending in the Z-axis direction.
- the external shape of the green honeycomb molded body 70 is not particularly limited, for example, a cylindrical column, an elliptical column, a rectangular column (for example, a regular polygonal column such as a regular triangular column, a square column, a regular hexagonal column, a regular octagonal column, or a triangular column other than a regular polygonal column) , Square pillars, hexagonal pillars, octagonal pillars, etc.).
- the cross-sectional shape of each through-hole 70a is not specifically limited, For example, polygons, such as a circle, an ellipse, a square, a rectangle, a triangle, a hexagon, etc. are mentioned.
- the through holes 70a may have different sizes and different cross-sectional shapes.
- the arrangement of the through holes 70a when viewed from the end surface in the Z-axis direction of the green honeycomb molded body 70 is also not particularly limited.
- the green honeycomb molded body 70 is arranged so that the central axis of the through holes 70a is located at the apexes of the squares.
- a regular triangle arrangement in which the central axis of the through hole 70a is arranged at the apex of the regular triangle.
- the size of the through hole 70a is also not particularly limited.
- the side can be 0.8 to 2.5 mm.
- the thickness of the partition wall separating the through holes 70a can be set to 0.15 to 0.76 mm, for example.
- the length of the green honeycomb molded body 70 in the direction in which the through hole 70a extends is not particularly limited, but may be, for example, 40 to 350 mm.
- the outer diameter of the green honeycomb molded body 70 is not particularly limited, but may be, for example, 100 to 320 mm.
- FIG. A green honeycomb molded body 70A shown in FIG. 2 has a through hole 70a having a square cross-sectional shape.
- a green honeycomb molded body 70B shown in FIG. 2 has a plurality of through holes 71a and 71b having different cross-sectional shapes.
- the plurality of through holes 71a and 71b are partitioned by a partition wall 72 extending substantially parallel to the central axis of the green honeycomb molded body 70B.
- the through hole 71a has a regular hexagonal cross-sectional shape.
- the through hole 71b has a flat hexagonal cross-sectional shape and is arranged so as to surround one through hole 71a.
- the green honeycomb molded body 70 is green (unfired body) that becomes ceramics by firing later, and is particularly preferably green that becomes porous ceramics.
- the green honeycomb molded body 70 includes a ceramic raw material.
- the ceramic is not particularly limited, and examples thereof include alumina, silica, mullite, cordierite, glass, oxides such as aluminum titanate, silicon carbide, silicon nitride, and metal.
- the aluminum titanate can further contain magnesium and / or silicon.
- the green honeycomb molded body 70 preferably includes an inorganic compound source powder that is a ceramic raw material, an organic binder such as methylcellulose, and an additive that is added as necessary.
- the inorganic compound source powder is aluminum source powder such as ⁇ alumina powder, titanium source powder such as anatase type or rutile type titania powder, and / or aluminum titanate powder.
- a magnesium source powder such as magnesia powder and magnesia spinel powder and / or a silicon source powder such as silicon oxide powder and glass frit can be further contained.
- the organic binder examples include celluloses such as methylcellulose, carboxymethylcellulose, hydroxyalkylmethylcellulose, and sodium carboxymethylcellulose; alcohols such as polyvinyl alcohol; and lignin sulfonate.
- the amount of the organic binder is preferably 20 parts by weight or less, more preferably 15 parts by weight or less, and still more preferably 6 parts by weight with respect to 100 parts by weight of the inorganic compound source powder.
- the minimum amount of an organic binder is 0.1 weight part, More preferably, it is 3 weight part.
- additives include a pore-forming agent, a lubricant and a plasticizer, a dispersant, and a solvent.
- pore-forming agents include carbon materials such as graphite; resins such as polyethylene, polypropylene and polymethyl methacrylate; plant materials such as starch, nut shells, walnut shells and corn; ice; and dry ice.
- the amount of pore-forming agent added is preferably 0 to 40 parts by weight, more preferably 0 to 25 parts by weight with respect to 100 parts by weight of the inorganic compound source powder.
- Lubricants include alcohols such as glycerin; higher fatty acids such as caprylic acid, lauric acid, palmitic acid, arachidic acid, oleic acid and stearic acid; and stearic acid metal salts such as Al stearate.
- the addition amount of the lubricant is preferably 0 to 10 parts by weight, more preferably 1 to 5 parts by weight with respect to 100 parts by weight of the inorganic compound source powder.
- plasticizer examples include polyoxyalkylene alkyl ether.
- the amount of the plasticizer is preferably from 0.1 to 20 parts by weight, more preferably from 0.1 to 10 parts by weight, still more preferably from 0.1 to 10 parts by weight based on 100 parts by weight of the inorganic compound source powder. 1 to 6 parts by weight.
- the dispersant examples include inorganic acids such as nitric acid, hydrochloric acid and sulfuric acid; organic acids such as oxalic acid, citric acid, acetic acid, malic acid and lactic acid; alcohols such as methanol, ethanol and propanol; ammonium polycarboxylate Surfactant etc. are mentioned.
- the addition amount of the dispersant is preferably 0 to 20 parts by weight, more preferably 2 to 8 parts by weight, based on 100 parts by weight of the inorganic compound source powder.
- the solvent for example, alcohols such as methanol, ethanol, butanol and propanol; glycols such as propylene glycol, polypropylene glycol and ethylene glycol; and water can be used. Of these, water is preferable, and ion-exchanged water is more preferably used from the viewpoint of few impurities.
- the amount of the solvent used is preferably 10 to 100 parts by weight, more preferably 20 to 80 parts by weight with respect to 100 parts by weight of the inorganic compound source powder. Further, the weight of the solvent relative to the total weight of the molded body is not particularly limited, but is preferably 10 to 30% by weight, and more preferably 15 to 20% by weight.
- Such a green honeycomb molded body 70 can be manufactured as follows, for example. First, an inorganic compound source powder, an organic binder, a solvent, and additives to be added as necessary are prepared. Then, these are mixed by a kneader or the like to obtain a raw material mixture, and the obtained raw material mixture is extruded from an extruder having an outlet opening corresponding to the cross-sectional shape of the green honeycomb molded body, and cut into a desired length, A green honeycomb molded body 70 can be obtained.
- the container 10 can accommodate the green honeycomb molded body 70, the mounting table 40, and the outlet portion 36 a of the pipe line 36.
- the container 10 is preferably made of metal from the viewpoint of shielding microwaves.
- the container 10 is provided with a discharge port 10b for discharging the gas in the container 10 to the outside.
- the container 10 also has a waveguide 10 a that receives the microwave supplied from the microwave source 20.
- the microwave source 20 generates a microwave for heating the green honeycomb molded body 70.
- the wavelength of the microwave is not particularly limited as long as the green honeycomb molded body 70 can be heated. Preferred wavelengths are 895 to 940 MHz or 2400 to 2500 MHz. It is preferable that the microwave source 20 can reduce the microwave output as it is dried.
- the output of the microwave is not particularly limited, but may be, for example, 1 to 10 kW per green honeycomb molded body. More specifically, the microwave output per unit weight of the green honeycomb molded body 70 is preferably 0.02 to 10 kW / kg, more preferably 0.2 to 4 kW / kg, and still more preferably 1 to 3 kW / kg.
- the microwave output per unit weight of the green honeycomb molded body 70 is less than 0.02 kW / kg, it takes a long time to dry the green honeycomb molded body 70, and if it exceeds 10 kW / kg, it is included in the green honeycomb molded body 70. Abnormal heat generation of the organic matter occurs, and the green honeycomb molded body 70 is combusted and the yield tends to decrease.
- the mounting table 40 is a table that is disposed in the container 10 and on which the green honeycomb molded body 70 is mounted.
- the mounting table 40 includes a gas dispersion plate 42 and a non-breathable ring member 44 surrounding the side surface of the gas dispersion plate 42.
- the green honeycomb molded body 70 is placed on the gas dispersion plate 42 so that one end surface (lower surface) 70d provided with openings of the plurality of through holes 70a faces the upper surface of the gas dispersion plate 42.
- the size of the upper surface (gas release region) of the gas dispersion plate 42 is equal to the size of the end surface 70d of the green honeycomb molded body 70, but is slightly larger than the end surface 70d. Also good.
- the gas dispersion plate 42 is a plate having a plurality of holes communicating with the front and back surfaces, and makes the gas flow in the in-plane direction uniform when allowing the gas supplied from below to pass upward.
- a so-called perforated plate for example, a honeycomb structure similar to a green honeycomb molded body
- any gas can be discharged upward.
- a so-called porous plate having a large number of pores that communicate with each other and are bent may be used.
- the material of the gas dispersion plate 42 is also not particularly limited, and examples thereof include ceramics such as alumina and cordierite.
- the thickness of the gas dispersion plate 42 can be set to 10 to 100 mm, for example.
- the planar shape of the holes when the gas dispersion plate 42 is a perforated plate is not limited, and may be, for example, a square, a circle, a hexagon, or an octagon. For example, when the shape of the hole is a square, the length of one side can be 0.7 to 10 mm.
- the wall thickness between the holes can be set to 0.03 to 3.0 mm, for example.
- the average pore diameter when the gas dispersion plate 42 is a porous plate is not particularly limited, but is preferably 0.1 to 100 ⁇ m.
- the average pore diameter can be measured by a mercury intrusion method.
- the porosity is preferably 10 to 90%.
- the porous plate comprised from the porous plate may be sufficient.
- the ring member 44 surrounds the side surface of the gas dispersion plate 42 to prevent gas leakage from the side surface.
- the heating gas source 30 heats the gas flowing in the pipe 36 by being provided in the blower 32 disposed outside the container 10, the pipe 36 that guides the gas from the blower 32 to the lower surface of the gas dispersion plate 42, and the pipe 36.
- the heater 34 is provided.
- the gas heating temperature is not particularly limited, but the lower limit temperature is preferably 30 ° C, more preferably 40 ° C, even more preferably 50 ° C, particularly preferably 70 ° C, and the upper limit temperature is preferably 200 ° C, more preferably 120 ° C. ° C, more preferably 100 ° C.
- the gas is not particularly limited, but air is preferable from the economical viewpoint.
- the amount of gas supply is not particularly limited, but the area average gas wind speed immediately above the gas dispersion plate 42 is preferably 0.1 to 10 m / s, and more preferably 0.5 to 5 m / s. It is more preferable.
- the outlet portion 36 a of the pipe 36 has a diameter that increases in accordance with the area of the lower surface of the gas dispersion plate 42, and is in contact with the lower surface of the ring member 44.
- a steam supply port 10 c is formed on the wall of the container 10.
- a water vapor supply source is connected to the water vapor supply port 10c via a water vapor supply line L1, and water vapor is supplied into the container 10 to maintain an atmosphere in which water vapor exists around each green honeycomb molded body. Can do. It is preferable to supply an amount of water vapor that saturates the container 10 from the line L1.
- the supply condition of water vapor is not particularly limited, but for example, the temperature is preferably 100 to 200 ° C. and the supply amount is preferably 0.1 to 5.0 kg / min. More specifically, it is preferably 0.1 to 30 kg / hr with respect to the unit weight of the green honeycomb molded body 70.
- the seal member 80 is a member for preventing the heated gas from the gas dispersion plate 42 from hitting the outer peripheral wall of the green honeycomb molded body 70.
- the seal member 80 is disposed so as to cover the outside of the lower end portion of the green honeycomb molded body 70 and the peripheral edge portion of the gas dispersion plate 42.
- the seal member 80 is preferably made of a material that can follow the shrinkage associated with the drying of the green honeycomb molded body 70. Examples of such materials include silicone rubber and fluorine rubber.
- the sealing member 80 is made of the above-described cylindrical material, when arranged as shown in FIG. 3A, the portion 80a extending in the axial direction (Z direction) and the direction perpendicular to the Z direction (XY plane) are arranged. An expanding portion 80b is formed.
- the cylindrical seal member 80 may be processed to previously form a portion 80a extending in the Z direction and a portion 80b extending in the horizontal direction in the axial direction.
- the inner diameter D1 when the portion 80a extending in the Z direction is not attached is larger than the outer diameter D2 when the green honeycomb formed body 70 is dried. Is preferably slightly smaller, and the difference (D2 ⁇ D1) may be about 1 to 20 mm.
- the inner diameter of the seal member 80 is preferably about 140 to 130 mm.
- the length L80b in the Z direction of the seal member 80 is not particularly limited, but may be 1 to 100 mm.
- the thickness of the seal member 80 can be set to 0.5 to 5 mm, for example.
- the drying method of the green honeycomb molded object concerning this embodiment is demonstrated.
- the base end side (part 80 a) of the seal member 80 is attached to the outside of one end portion of the green honeycomb molded body 70, and the upper surface of the gas dispersion plate 42 of the container 10.
- the green honeycomb molded body 70 is placed so that the end faces 70d face each other.
- the front end side (part 80 b) of the seal member 80 is expanded so as to cover the peripheral edge of the gas dispersion plate 42.
- the blower 32 is started and the heater 34 is started. Further, a microwave is supplied from the microwave source 20 into the container 10. Further, water vapor is continuously supplied from the water vapor supply port 10b into the container, and an atmosphere in which water vapor exists is formed around each green honeycomb molded body 70.
- the heated gas is supplied to the lower surface of the gas dispersion plate 42 through the pipe 36 in a state where the surroundings of the green honeycomb molded body 70 are in a water vapor presence atmosphere, and further passes through the gas dispersion plate 42. Then, it passes through each through hole 70 a of the green honeycomb molded body 70 and is discharged from the upper end surface 70 u of the green honeycomb molded body 70, and then discharged from the discharge port 10 b of the container 10. Further, the green honeycomb molded body 70 is irradiated with microwaves. Note that it suffices if there is a time zone in which both the heated gas and the microwave are supplied at the same time, and the start or end timings of the supply need not necessarily be the same.
- the solvent component of the green honeycomb molded body 70 is removed by such heating and gas supply, and the drying proceeds.
- the degree of final drying of the molded body which is reached by drying by supplying heated gas and microwaves in a steam atmosphere, is not particularly limited, but when the supply of microwaves and water vapor is stopped, the drying rate of the molded body, That is, the ratio of the solvent mass removed by drying to the solvent mass before drying of the molded body is preferably 80% or more, more preferably 90% or more, and further preferably 95% or more.
- steam it is also preferable to advance drying by flowing only heated gas.
- the outer surface of the green honeycomb molded body is excessively dried before the center portion by providing a steam atmosphere around the green honeycomb molded body during heating gas supply and microwave irradiation. It is suppressed.
- the sealing member 80 capable of following the contraction of the green honeycomb molded body 70, it is possible to sufficiently prevent the heated gas from leaking outside the green honeycomb molded body 70 being dried (see FIG. 6). It can prevent more reliably that the outer peripheral wall of the molded object 70 dries excessively. Further, the use of the seal member 80 can effectively prevent the following problems. That is, when the opening area of the through hole 70a of the green honeycomb molded body 70 is relatively small, when the gas release region of the gas dispersion plate 42 is exposed as the green honeycomb molded body 70 contracts, a large amount of heated gas is generated from the region. The amount of gas flowing outside the molded body 70 and flowing through the through hole 70a is reduced.
- the inside of the molded body 70 becomes insufficiently dried, and problems such as cell crushing and cracking of the molded body occur in a process (for example, a cutting process) after drying.
- the yield can be improved by sufficiently reducing such problems.
- the ceramic honeycomb structure is obtained by sealing the end portion of the through-hole 70a of the green honeycomb molded body 70 thus dried, if necessary, and then firing.
- a ceramic honeycomb structure can be used as a diesel particulate filter or a catalyst carrier for an exhaust gas treatment apparatus.
- the drying apparatus 200 concerning 2nd Embodiment is demonstrated.
- the drying apparatus 200 according to the present embodiment is for drying two green honeycomb molded bodies 70 simultaneously.
- the mounting table 40 includes two gas dispersion plates (gas outlets) 42 and a non-breathable ring member 44 surrounding the side surfaces of the two gas dispersion plates 42.
- the outer shape is a disk shape.
- the two green honeycomb molded bodies 70 are placed on the gas dispersion plates 42 so that one end surfaces (lower surfaces) 70d provided with openings of the plurality of through holes 70a are opposed to the upper surfaces of the respective gas dispersion plates 42.
- the sealing member 80 covers the outside of the lower end portion of the green honeycomb molded body 70 and the peripheral edge portion of the gas dispersion plate 42.
- Each gas dispersion plate 42 and the seal member 80 are the same as those in the first embodiment.
- the two gas dispersion plates 42 have a distance D between the green honeycomb molded bodies 70 placed on these gas dispersion plates 42, when the wavelength of the microwave supplied from the microwave source 20 is ⁇ . They are arranged to exceed 2 ⁇ .
- a vertical shaft 52 is provided on the lower surface of the center of the mounting table 40, and the vertical shaft 52 can be rotated by a motor 50. Thereby, the mounting table 40 can be rotated around the vertical axis in the container 10.
- the number of rotations is not particularly limited, but can be 1 to 60 rpm.
- the outlet 36 a of the pipe 36 is provided with an opening 36 ab that faces upward and has a ring shape when viewed from above.
- the tip 36ae of the outlet portion 36a is in contact with the lower surface of the ring member 44 as shown in FIG. Since the outlet portion 36a has the ring-shaped opening 36ab facing upward, the heated gas can be supplied to the gas dispersion plate 42 serving as a gas outlet regardless of the rotation position of the mounting table 40 that rotates. It can be supplied to each through-hole 70a of each green honeycomb molded body 70 via.
- the distal end 36ae of the outlet portion 36a can be brought into contact with the lower surface of the ring member 44 while sliding, and gas sealing is possible.
- the same operational effects as those of the first embodiment are achieved. Further, since the distance D between the green honeycomb molded bodies 70 is more than half of the microwave wavelength ⁇ , the microwaves can sufficiently wrap around the green honeycomb molded bodies 70 and the two molded bodies are uneven. And easy to dry.
- microwaves can be used efficiently, so that the microwave output and heating gas supply per one green honeycomb molded body 70 are supplied.
- the drying time can be shortened as compared with the case of drying alone.
- a fixture 85 for fixing the green honeycomb molded body 70 may be provided on the mounting table 40.
- the present invention is not limited to the above embodiment, and various modifications can be made.
- the surface of the gas dispersion plate 42 is horizontally arranged, and the green honeycomb molded body 70 is held by placing the green honeycomb molded body 70 on the upper surface of the gas dispersion plate 42.
- the surface of the gas dispersion plate 42 may be arranged vertically, and the green honeycomb molded body 70 may be held by another holding member such that the end face 70d of the green honeycomb molded body 70 is in contact with the vertical surface.
- two gas dispersion plates 42 are provided on the mounting table 40, two green honeycomb molded bodies 70 are placed on the gas dispersion plates 42, and these molded bodies are attached at a time. Although dried, three or more green honeycomb molded bodies 70 may be dried at a time by providing three or more gas dispersion plates.
- the sealing member 80 having flexibility is used as a particularly preferable example.
- An annular plate that covers the exposed portion may be used as the seal member.
- the present invention can be implemented even when the distance between the two green honeycomb molded bodies 70 is 1 ⁇ 2 or less of the microwave wavelength ⁇ .
- a firing table having the same composition and through-hole structure as the green honeycomb molded body 70 is provided, and a green honeycomb molded body 70 is mounted thereon. It may be placed.
- the torch 42a, the green honeycomb molded body 70, and the seal member 80 may be integrated in advance and placed on the gas dispersion plate 42.
- the sealing member 80 By using a material made of a material that can follow the shrinkage of the green honeycomb molded body as the sealing member 80, the peripheral portion (exposed gas release region) of the torch 42 a is sealed as shown in FIG. The state covered with can be maintained.
- Example (Method for manufacturing honeycomb formed body) A green honeycomb molded body was obtained using the following inorganic compound source powder.
- Mixing composition of the inorganic compound source powder, alumina [Al 2 O 3], titania [TiO 2], magnesia [MgO] and silica in a molar percentage of [SiO 2] terms, [Al 2 O 3] / [TiO 2] / [MgO] / [SiO 2 ] 35.1% / 51.3% / 9.6% / 4.0%.
- the content of the silicon source powder in the total amount of the aluminum source powder, the titanium source powder, the magnesium source powder and the silicon source powder was 4.0% by weight.
- Aluminum source powder ⁇ -alumina powder having an average particle diameter shown in Table 1 24.6 parts by weight
- Magnesium source powder 15.7 parts by weight of magnesia spinel powder having an average particle size shown in Table 1 (4) Silicon source powder Glass frit having an average particle size shown in Table 1 (“CK0832” manufactured by Takara Standard) 3.4 parts by weight
- a mixture comprising an aluminum source powder, a titanium source powder, a magnesium source powder and a silicon source powder, 14.3 parts by weight of corn starch having an average particle diameter shown in Table 1 as a pore-forming agent and methyl cellulose as an organic binder (trade name: Metrows 90SH-30000) 5.5 parts by weight, polyoxyethylene polyoxypropylene butyl ether as a plasticizer (trade name: Unilube 50MB-72, viscosity at 20 ° C.
- the green honeycomb molded body was a cylinder having a large number of through holes (220 mm in length), and the large number of through holes were arranged in a square shape in a matrix (see FIG. 2).
- the cross-sectional shape of the through hole was a square with a side of 1.43 mm, and the thickness of the partition wall was 0.32 mm.
- the green honeycomb molded body was dried with the drying apparatus shown in FIG. That is, a state in which a sealing member (thickness: 1 mm, length: 10 mm, material: silicone rubber) having an inner diameter slightly smaller than the diameter of the green honeycomb molded body is mounted on the green honeycomb molded body as shown in FIG. And dried. Drying conditions were as follows. Specifications of gas dispersion plate: material: alumina, thickness: 40 mm, the planar shape of the hole is a square with a side of 5.2 mm, and a wall thickness of 1.1 mm. The frequency of the microwave was 2.45 GHz, and the output of the microwave was 24 kW from 0 to 5.5 minutes for the drying time and 14.4 kW from 5.5 to 11 minutes.
- the supply gas was air, and the heating temperature of the supply gas was 70 ° C.
- the amount of gas supply was set such that the area average gas wind speed immediately above the gas dispersion plate was 1 m / s.
- the temperature of the water vapor was 120 ° C., and the supply amount was 1.4 kg / min.
- the microwave irradiation time was from time 0 to 11 minutes, the water vapor supply time was from time 0 to 5.5 minutes, and the heated gas was supplied from time 0 to 11 minutes.
- the drying rate of the green honeycomb molded body was 91.9%.
- a green honeycomb molded body was dried in the same manner as in the example except that the seal member was not used.
- the dried molded body had a lower outer diameter compared to other portions, and many wrinkles were observed on the outer peripheral surface of the lower part of the molded body.
- the drying rate of the green honeycomb molded body was 73.8%.
- the present invention it is possible to provide a drying device and a drying method for a green honeycomb molded body that can suppress deformation and cracking of the green honeycomb molded body during drying.
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Abstract
Description
(乾燥装置)
本実施形態にかかるグリーンハニカム成形体の乾燥装置100は、グリーンハニカム成形体70を乾燥させるものであり、主として、容器10と、容器10内にマイクロ波を供給するマイクロ波源20と、容器10内に配置された載置台40と、載置台40の気体分散板(気体出口)42を介してグリーンハニカム成形体70の複数の貫通孔70aに加熱気体を供給する加熱気体源30と、気体分散板42からグリーンハニカム成形体70の外側に加熱気体があたるのを防止するシール部材80と、を備える。
まず、乾燥対象となるグリーンハニカム成形体70について説明する。
本実施形態に係るグリーンハニカム成形体70は、図1に示すように、それぞれ、Z軸方向に延びる多数の貫通孔70aを有する柱体である。グリーンハニカム成形体70の外形形状は特に限定されないが、例えば、円柱、楕円柱、角柱(例えば、正三角柱、正方形柱、正六角柱、正八角柱等の正多角柱や、正多角柱以外の、三角柱、四角柱、六角柱、八角柱等)等である。また、各貫通孔70aの断面形状も特に限定されず、例えば、円形、楕円形、正方形、長方形、三角形、六角形等の多角形等が挙げられる。貫通孔70aには、大きさの異なるもの、断面形状の異なるものが混在してもよい。
貫通孔70aの大きさも特に限定されず、例えば、断面が正方形の場合、一辺0.8~2.5mmとすることができる。貫通孔70a同士を隔てる隔壁の厚みは、例えば、0.15~0.76mmとすることができる。
また、成形体全体の重量に対する溶媒の重量は特に限定されないが、10~30重量%が好ましく、15~20重量%がより好ましい。
まず、無機化合物源粉末と、有機バインダと、溶媒と、必要に応じて添加される添加物を用意する。そして、これらを混練機等により混合して原料混合物を得、得られた原料混合物をグリーンハニカム成形体の断面形状に対応する出口開口を有する押出機から押し出し、所望の長さに切ることにより、グリーンハニカム成形体70を得ることができる。
容器10は、グリーンハニカム成形体70、載置台40、管路36の出口部36aを収容可能である。容器10は、マイクロ波を遮蔽する観点から、金属製が好ましい。容器10には、容器10内のガスを外部に排出する排出口10bが設けられている。また、容器10は、マイクロ波源20から供給されるマイクロ波を受け入れる導波管10aを有する。
マイクロ波源20は、グリーンハニカム成形体70中を加熱するためのマイクロ波を発生する。マイクロ波の波長は、グリーンハニカム成形体70を加熱できるものであれば特に限定されない。好ましい波長は、895~940MHzまたは2400~2500MHzである。マイクロ波源20は、マイクロ波の出力を、乾燥にしたがって低下させることができるものであることが好ましい。マイクロ波の出力は特に限定されないが、グリーンハニカム成形体1個あたり、例えば、1~10kWとすることができる。より具体的には、グリーンハニカム成形体70の単位重量あたりのマイクロ波出力は好ましくは0.02~10kW/kgでり、より好ましくは0.2~4kW/kgであり、さらに好ましくは1~3kW/kgである。グリーンハニカム成形体70の単位重量あたりのマイクロ波出力が0.02kW/kg未満であるとグリーンハニカム成形体70の乾燥に長時間要し、10kW/kgを越えるとグリーンハニカム成形体70に含まれる有機物の異常発熱が生じ、グリーンハニカム成形体70が燃焼して歩留まりが低下しやすい。
載置台40は、容器10内に配置され、その上面にグリーンハニカム成形体70を載せ置く台である。載置台40は、気体分散板42と、気体分散板42の側面を取り囲む通気性のないリング部材44とを備える。グリーンハニカム成形体70は、その複数の貫通孔70aの開口が設けられた一端面(下面)70dが、気体分散板42の上面に対して対向するように気体分散板42上に載置される。なお、本実施形態においては、気体分散板42の上面(ガス放出領域)の大きさは、グリーンハニカム成形体70の端面70dの大きさと同等とされているが、端面70dよりも一回り大きくてもよい。
気体分散板42が多孔板の場合の孔の平面形状も限定されず、例えば、正方形、円形、六角形、八角形とすることができる。孔の径は、例えば、形状が正方形の場合例えば、一辺の長さ0.7~10mmとすることができる。また、孔間の壁の厚みは、例えば、0.03~3.0mmとすることができる。
一方、気体分散板42が多孔質板の場合の平均細孔径は特に限定されないが、0.1~100μmが好ましい。平均細孔径は、水銀圧入法により測定できる。また、気孔率は、10~90%が好ましい。なお、多孔質板から構成された多孔板でもよい。
加熱気体源30は、容器10の外に配置されたブロア32、ブロア32からのガスを気体分散板42の下面に導く管路36、管路36に設けられて管路36を流れるガスを加熱するヒータ34を備える。ガスの加熱温度は特に限定されないが、下限温度は好ましくは30℃、より好ましくは40℃、さらに好ましくは50℃、特に好ましくは70℃であり、上限温度は好ましくは200℃、より好ましくは120℃、さらに好ましくは100℃である。ガスも特に限定されないが、経済的観点から、空気が好ましい。ガスの供給量も特に限定されないが、気体分散板42直上での気体分散板の面積平均のガスの風速が0.1~10m/sであることが好ましく、0.5~5m/sであることがより好ましい。
容器10の壁には、水蒸気供給口10cが形成されている。水蒸気供給口10cには、水蒸気供給ラインL1を介して水蒸気供給源が接続されており、容器10内に水蒸気を供給し、各グリーンハニカム成形体の周りを水蒸気が存在する雰囲気下に維持することができる。容器10内が飽和状態になる量の水蒸気をラインL1から供給することが好ましい。容器10内を高湿度環境とすることで、グリーンハニカム成形体70の変形、特に乾燥初期における変形を抑制できる。水蒸気の供給条件も特に限定されないが、例えば、温度は100~200℃、供給量は0.1~5.0kg/minとすることが好ましい。より具体的には、グリーンハニカム成形体70の単位重量あたりに対し、0.1~30kg/hrであることが好ましい。
シール部材80は、気体分散板42からの加熱気体がグリーンハニカム成形体70の外周壁にあたるのを防止するための部材である。シール部材80は、グリーンハニカム成形体70の下端部の外側及び気体分散板42の周縁部を覆うように配置されている。
続いて、本実施形態にかかるグリーンハニカム成形体の乾燥方法について説明する。
まず、図3の(a)に示すように、グリーンハニカム成形体70の一方の端部の外側にシール部材80の基端側(部分80a)を装着し、容器10の気体分散板42の上面に、端面70dが対向するようにグリーンハニカム成形体70を載せる。このとき、シール部材80の先端側(部分80b)を気体分散板42の周縁部を覆うように広げる。
続いて、図4及び図5を参照して、第2実施形態にかかる乾燥装置200について説明する。本実施形態では、第1実施形態との差異点のみ説明し、重複する説明は割愛する。本実施形態にかかる乾燥装置200は、2つのグリーンハニカム成形体70を同時に乾燥するものである。
たとえば、上記実施形態では、気体分散板42の表面が水平に配置されており、気体分散板42の上面にグリーンハニカム成形体70を載せることでグリーンハニカム成形体70が保持されるがこれには限定されない。たとえば、気体分散板42の表面を垂直に配置し、グリーンハニカム成形体70の端面70dがこの垂直表面に接触するように、他の保持部材によりグリーンハニカム成形体70を保持してもよい。
(ハニカム成形体の製造方法)
無機化合物源粉末として以下のものを用いて、グリーンハニカム成形体を得た。無機化合物源粉末の仕込み組成は、アルミナ〔Al2O3〕、チタニア〔TiO2〕、マグネシア〔MgO〕およびシリカ〔SiO2〕換算のモル百分率で、〔Al2O3〕/〔TiO2〕/〔MgO〕/〔SiO2〕=35.1%/51.3%/9.6%/4.0%であった。アルミニウム源粉末、チタニウム源粉末、マグネシウム源粉末およびケイ素源粉末の合計量中のケイ素源粉末の含有率は、4.0重量%であった。
(1)アルミニウム源粉末
表1に示される平均粒子径を有するα-アルミナ粉末 24.6重量部
(2)チタニウム源粉末
表1に示される平均粒子径を有するルチル型チタニア粉末 42.0重量部
(3)マグネシウム源粉末
表1に示される平均粒子径を有するマグネシアスピネル粉末 15.7重量部
(4)ケイ素源粉末
表1に示される平均粒子径を有するガラスフリット(タカラスタンダード社製「CK0832」) 3.4重量部
乾燥条件は以下のようにした。
気体分散板のスペック:材料:アルミナ、厚み:40mm、孔の平面形状は1辺5.2mmの正方形、壁の厚み1.1mm。
マイクロ波の周波数は2.45GHzとし、マイクロ波の出力は乾燥時間0~5.5分まで24kW、5.5~11分まで14.4kWとした。
供給ガスは空気、供給ガスの加熱温度は70℃とした。ガスの供給量は、気体分散板の直上での気体分散板の面積平均のガスの風速が1m/sとなるように設定した。水蒸気の温度は120℃、供給量は1.4kg/minとした。マイクロ波の照射時間は時刻0から11分まで、水蒸気の供給時間は時刻0から5.5分まで、加熱気体の供給は時刻0から11分まで行った。
乾燥率(%)=(乾燥前重量-乾燥後重量)/(乾燥前重量×含水率)×100
シール部材を用いない以外は実施例と同様にしてグリーンハニカム成形体の乾燥処理を行った。乾燥後の成形体は下部の外径がその他の箇所と比較して小さく、また成形体の下部の外周面には多数のしわが認められた。グリーンハニカム成形体の乾燥率は、73.8%であった。
Claims (6)
- 複数の貫通孔を有するグリーンハニカム成形体をマイクロ波及び加熱気体によって乾燥する方法であって、
加熱気体を放出可能な気体分散板上に前記グリーンハニカム成形体を載置する工程と、
前記グリーンハニカム成形体の周りに水蒸気が存在する雰囲気下で、前記グリーンハニカム成形体の各貫通孔に前記気体分散板を通じて加熱気体を供給すると同時に、前記グリーンハニカム成形体にマイクロ波を照射する工程と、
を備え、
加熱気体の供給及びマイクロ波の照射に先立ち、前記グリーンハニカム成形体の前記気体分散板側の端部の外側に、前記気体分散板からの加熱気体が前記グリーンハニカム成形体の外周壁にあたるのを防止するシール部材を配置する方法。 - 前記気体分散板における加熱気体が放出される領域は前記グリーンハニカム成形体の端面よりも大きく、当該領域のうち前記グリーンハニカム成形体の端面によって覆われない部分を前記シール部材で塞ぐ、請求項1に記載の方法。
- 前記シール部材は、前記グリーンハニカム成形体の乾燥に伴う収縮に追従可能な材料からなる、請求項1又は2に記載の方法。
- 複数の貫通孔を有するグリーンハニカム成形体の乾燥装置であって、
容器と、
前記容器内にマイクロ波を供給するマイクロ波源と、
前記容器内に加熱気体を供給する加熱気体源と、
前記容器内に水蒸気を供給する水蒸気供給口と、
前記容器内において、前記グリーンハニカム成形体における前記複数の貫通孔の開口が設けられた端面の一方に対して、前記加熱気体源からの加熱気体を供給する気体分散板と、
前記グリーンハニカム成形体の前記気体分散板側の端部の外側に配置され、前記気体分散板からの加熱気体が前記グリーンハニカム成形体の外周壁にあたるのを防止するシール部材と、
を備える装置。 - 前記気体分散板における加熱気体が放出される領域は前記グリーンハニカム成形体の端面よりも大きく、前記シール部材は当該領域のうち前記グリーンハニカム成形体の端面によって覆われない部分を塞ぐものである、請求項4に記載の装置。
- 前記シール部材は、前記グリーンハニカム成形体の乾燥に伴う収縮に追従可能な材料からなる、請求項4又は5に記載の装置。
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MX2013010162A MX2013010162A (es) | 2011-03-07 | 2012-03-06 | Metodo de secado y dispositivo de secado para cuerpo moldeao en forma de panal verde. |
US14/002,885 US9441879B2 (en) | 2011-03-07 | 2012-03-06 | Drying method and drying device for green honeycomb molded body |
KR1020137023036A KR20140006937A (ko) | 2011-03-07 | 2012-03-06 | 그린 허니컴 성형체의 건조 방법 및 건조 장치 |
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- 2012-03-06 KR KR1020137023036A patent/KR20140006937A/ko not_active Application Discontinuation
- 2012-03-06 EP EP12754420.3A patent/EP2684660A4/en not_active Withdrawn
- 2012-03-06 US US14/002,885 patent/US9441879B2/en not_active Expired - Fee Related
- 2012-03-06 JP JP2012049776A patent/JP5856877B2/ja not_active Expired - Fee Related
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CN116222181B (zh) * | 2023-04-25 | 2023-09-19 | 江苏万德环保科技有限公司 | 一种蜂窝式scr脱硝催化剂烘干机构 |
Also Published As
Publication number | Publication date |
---|---|
EP2684660A4 (en) | 2014-08-20 |
MX2013010162A (es) | 2013-09-26 |
JP2012196964A (ja) | 2012-10-18 |
KR20140006937A (ko) | 2014-01-16 |
EP2684660A1 (en) | 2014-01-15 |
US20140007452A1 (en) | 2014-01-09 |
US9441879B2 (en) | 2016-09-13 |
JP5856877B2 (ja) | 2016-02-10 |
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