WO2005047207A1 - 炉及び脱脂方法 - Google Patents
炉及び脱脂方法 Download PDFInfo
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- WO2005047207A1 WO2005047207A1 PCT/JP2004/016305 JP2004016305W WO2005047207A1 WO 2005047207 A1 WO2005047207 A1 WO 2005047207A1 JP 2004016305 W JP2004016305 W JP 2004016305W WO 2005047207 A1 WO2005047207 A1 WO 2005047207A1
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- C—CHEMISTRY; METALLURGY
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/638—Removal 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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/06—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
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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
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6562—Heating rate
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- C—CHEMISTRY; METALLURGY
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- 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
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6567—Treatment time
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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
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/658—Atmosphere during thermal treatment
- C04B2235/6583—Oxygen containing atmosphere, e.g. with changing oxygen pressures
- C04B2235/6584—Oxygen containing atmosphere, e.g. with changing oxygen pressures at an oxygen percentage below that of air
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/658—Atmosphere during thermal treatment
- C04B2235/6586—Processes characterised by the flow of gas
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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
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/658—Atmosphere during thermal treatment
- C04B2235/6588—Water vapor containing atmospheres
Definitions
- the present invention relates to a furnace and a degreasing method, and more particularly, to prevent the generation of cracks in a degreased material due to abnormal combustion of an organic decomposition gas by maintaining a low oxygen gas concentration in a furnace body.
- the present invention also relates to a furnace capable of easily and inexpensively degreasing a degreased material in a short time and a degreasing method capable of obtaining a defatted material in which cracks are prevented in a short time in a simple and inexpensive manner.
- a ceramic material containing an organic substance for example, an organic binder, an organic pore former, etc.
- a molded body (defatted object) formed from such a ceramic material containing an organic substance is usually degreased to remove organic substances contained in the object to be degreased before being heated and fired at a high temperature to form a fired body. Need to do.
- the organic matter contained in the degreased substance is decomposed and gasified by heating to generate an organic matter decomposition gas (eg, methyl alcohol, acetoaldehyde, etc.).
- an organic matter decomposition gas eg, methyl alcohol, acetoaldehyde, etc.
- Each of the generated organic decomposition gases has an upper and lower explosion limit (for example, 7.3-19% for methyl alcohol and 4.1-55% for acetoaldehyde).
- the concentration there is a problem that abnormal combustion occurs due to an explosion or the like during degreasing, and cracks and cracks are generated in the degreased material.
- an air supply port was installed in the furnace body to reduce the concentration of organic matter decomposition gas from the supply air to below the lower explosion limit, thereby reducing the concentration.
- Gas eg, air
- the concentration of oxygen gas in the furnace body was increased, so that the above-mentioned abnormal combustion during degreasing could not be avoided. Therefore, it is necessary to raise the temperature slowly and degreasing in a low temperature area for a long time, which is not efficient.
- a microwave firing means provided with a microwave heating means and provided with a furnace chamber for accommodating an object to be degreased containing an organic substance (also referred to as an object to be fired because it is fired in the next step).
- a microwave firing furnace has been proposed, which is characterized by having a carrier gas inlet pipe for introducing a carrier gas which contains oxygen and suppresses combustion of organic substances having an oxygen concentration lower than that of air. Patent Document 1).
- Patent Document 1 Japanese Patent Application Laid-Open No. 2003-302166
- the microwave firing furnace described in Patent Document 1 has a special purpose.
- a carrier gas having an oxygen concentration lower than that of air and a carrier gas introducing pipe for introducing the carrier gas are used. It had to be complex and expensive, and it was not always satisfactory.
- the present invention has been made in view of the above-described problems, and maintains a low oxygen gas concentration in a furnace body to generate cracks in a degreased material due to abnormal combustion of organic matter decomposition gas.
- Furnace capable of preventing degreasing in a short time, easily and inexpensively, and a degreasing method capable of obtaining a defatted material in which cracks are prevented in a simple and inexpensive manner in a short time
- the purpose is to provide.
- a furnace including a heating means, and a furnace body capable of heating and degreasing an object to be defatted containing an organic substance contained therein by the heating means,
- An exhaust port for exhausting a high-concentration organic substance decomposition gas and a low-concentration oxygen gas containing a low-concentration oxygen gas generated inside the furnace main body when the object to be degreased is degreased; and Low concentration for reducing the concentration of gas to prevent explosion of the organic decomposition gas
- a first heating unit having an air supply port for introducing a gas to be reduced, wherein the heating unit is capable of heating and degrease the object to be degreased accommodated in the furnace main body;
- a second heating means for heating the degreased gas discharged from the exhaust port to remove the organic matter-decomposed gas and processing the degreased gas into a processing gas containing the low-concentration oxygen gas;
- a processing gas introducing means for introducing a processing gas from the second heating means into the inside of the furnace main
- the furnace of the first invention A furnace capable of preventing the generation of cracks in the degreased material due to abnormal combustion of the cracked gas, degreasing the degreased material in a short time, and moving to the next firing process (hereinafter referred to as “ The furnace of the first invention ").
- a furnace comprising a heating means and a furnace main body capable of heating and degreasing the object to be defatted containing an organic substance contained therein, wherein the furnace main body comprises: The exhaust port for discharging the high-concentration organic matter decomposition gas and the low-concentration oxygen gas generated inside the furnace body during the degreasing of the object to be degreased to the outside, and the concentration of the organic matter decomposition gas from the outside A gas inlet for taking in a gas for reducing the concentration to prevent the explosion of the organic matter decomposition gas, and the heating means heats the degreased gas discharged from the exhaust port of the furnace body.
- the treatment gas introduced into the inside of the furnace main body through the air supply port reduces the concentration of the organic matter decomposition gas inside the furnace main body to prevent explosion, Keep the oxygen gas concentration in the inside low To prevent generation of cracks in the degreased object due to abnormal combustion of the organic substance decomposition gas, and to degrease the degreased object in a short time, and to proceed to the next firing process.
- Furnace hereinafter sometimes referred to as "furnace of the second invention").
- the organic substance may be polybutyl alcohol, polyethylene glycol, starch, methylphenolylose, canoleboxymethinoresenololose, hydroxyethynoresenorelose, hydroxypropyl propylmethylcellulose, polyethylene oxide, polyacrylic acid.
- the furnace according to any one of [1] to [3], wherein the furnace contains at least one kind.
- the process gas introducing means has an airtight pipe for communicating the second or third heating means with the furnace main body.
- the object to be defatted is a porous body, and remains in the object to be defatted without being removed even after degreasing, with respect to the volume of the visual acuity of the object to be degreased 4.
- the object to be degreased containing the organic substance housed inside the furnace body is heated and degreased by the heating means, and the next baking is performed.
- a degreasing method for transferring to a process wherein the furnace body includes a high-concentration organic substance decomposition gas and a low-concentration oxygen gas that are generated inside the furnace body when the object to be degreased is degreased.
- a first heating means capable of heating and degrease the object to be defatted accommodated in the furnace main body, and the exhaust port force of the furnace main body by heating the degreased gas discharged to produce the organic matter.
- Removal of decomposition gas and low concentration of the acid A gas having a second heating means for processing into a processing gas containing a gas, wherein the processing gas is supplied from the second heating means to the inside of the furnace body as the concentration reducing gas, The processing gas is further supplied to the inside of the furnace main body, the exhaust port, and the second gas by using a processing gas introducing means for introducing the gas through the air supply port and Z or the first heating means.
- the concentration of the organic matter decomposition gas in the furnace body is reduced to cause an explosion. While preventing the generation of cracks in the degreased material due to abnormal combustion of the organic decomposition gas by maintaining the oxygen gas concentration in the furnace body at a low concentration, and in a short time.
- Degrease the object to be degreased Degreasing method capable of migrating to the next firing process (hereinafter, sometimes referred to as "degreasing method of the third invention").
- the processing gas which does not operate the first heating means, is supplied to the inside of the furnace body, the exhaust port, the second heating means, the processing gas introduction means, and the air supply.
- the object to be degreased containing the organic substance housed inside the furnace body is heated and degreased by the heating means, and the next firing
- a degreasing method for transferring to a process wherein the furnace body includes a high-concentration organic substance decomposition gas and a low-concentration oxygen gas that are generated inside the furnace body when the object to be degreased is degreased. And an exhaust port for discharging the organic matter decomposition gas from the outside.
- a gas further provided with a processing gas introduction means for introducing the concentration-reducing gas through the air supply port as described above is used inside the furnace body, and the processing gas is supplied to the inside of the furnace body and the exhaust gas.
- the concentration of the organic substance decomposition gas inside the furnace body is reduced to prevent explosion. And the furnace The oxygen gas concentration inside the body is maintained at a low level to prevent the cracking of the degreased object due to abnormal combustion of the organic matter decomposition gas, and to degrease the degreased object in a short time.
- Degreasing method (hereinafter, referred to as “fourth degreasing method” of the present invention) which can be shifted to the baking process.
- a low-oxygen gas of a different system from the processing gas is introduced into the furnace body.
- Examples of the organic substance include polybutyl alcohol, polyethylene glycol, starch, methinoresenololose, canoleboxy methinoresenololose, hydroxyethinoresenololose, hydroxypropyl methylcellulose, polyethylene oxide, sodium polyacrylate, The group strength of polyacrylamide, polybutyral, ethylcellulose, cellulose acetate, polyethylene, ethylenic butyl acetate copolymer, polypropylene, polystyrene, acrylic resin, polyamide resin, glycerin, polyethylene glycol and dibutyl phthalate.
- the degreasing method according to any one of [10] to [13], wherein the method comprises using one containing at least one selected from the group.
- a means having an airtight pipe for communicating the second or third heating means with the furnace body is used, as in [10] to [16]. The degreasing method described.
- a heat exchange unit, a Z or a catalyst unit may be further provided between the second or third heating unit and the processing gas introducing unit and the Z or the low oxygen gas introducing unit.
- the object to be degreased is a porous body, and remains in the object to be degreased without being removed even after degreasing, with respect to a volume of 4 sight of the object to be degreased.
- Percentage of volume of Z or non-volatile inorganic compound [(Total volume of non-combustible and Z or non-volatile inorganic compounds remaining in degreased material without being removed even after degreasing Z
- the degreasing method according to any one of [10] to [18], wherein an apparent volume (X 100) of 5 to 60% is used.
- the oxygen gas concentration inside the furnace main body is maintained at a low concentration to prevent cracks from being generated in the degreased material due to abnormal combustion of the organic decomposition gas, and the degreased material is reduced in a short time. Further, the present invention provides a furnace capable of easily and inexpensively degreasing, and a degreasing method capable of easily and inexpensively obtaining a degreased product in which cracks are prevented from occurring.
- FIG. 1 is an explanatory view schematically showing one embodiment of the present invention (the furnace of the first invention and the degreasing method of the third invention).
- FIG. 2 is a graph showing the relationship between temperature and weight change when polyvinyl alcohol sufficiently dried at 80 ° C. as an organic substance is heated at a rate of 5 ° C.Z in three types of airflow.
- FIG. 3 is a graph showing the relationship between temperature and heat value when polyvinyl alcohol sufficiently dried at 80 ° C as an organic substance is heated at a rate of 5 ° CZ in three types of airflow. is there
- FIG. 4 is an explanatory view schematically showing one embodiment of the present invention (furnace of the second invention and degreasing method of the fourth invention).
- FIG. 5 is an explanatory view schematically showing an embodiment of the present invention (the furnace according to the first and second inventions and the degreasing method according to the third to fourth inventions).
- FIG. 1 is an explanatory view schematically showing one embodiment of the present invention (the furnace of the first invention and the degreasing method of the third invention).
- a heating means 1 and an object 5 containing organic matter contained therein are heated by the heating means 1 to degrease the object.
- the furnace body 2 is capable of removing high-concentration organic substance decomposition gas and low-concentration oxygen gas generated inside the furnace body 20 when the degreased material 5 is degreased.
- the heating means 1 heats and degreases the material 5 to be degreased contained in the furnace body 2 and the degreased gas 6 discharged from the exhaust port 21 of the furnace body 2. Heat to remove organic matter decomposed gas (substantially eliminate it) and reduce oxygen concentration And a second heating means 12 for processing the processing gas 7 containing gas, and supplying the processing gas 7 from the second heating means 12 to the inside of the furnace body 2 as a concentration reducing gas.
- a processing gas introduction means 3 introduced through the port 22 and Z or the first heating means 11, the inside of the furnace main body 20, an exhaust port 21, a second heating means 12, a processing gas
- the introduction means 3 and the air supply ports 22 and Z or the first heating means 11 are circulated through the air supply ports 22 and Z or the first heating means 11 by a circulation blower 3b or the like.
- the process gas 7 introduced into the body 20 reduces the concentration of organic matter decomposed gas inside the furnace body 20 to prevent explosion and keeps the oxygen gas concentration inside the furnace body 20 low.
- the processing gas 7 when the processing gas 7 is introduced (circulated) from the second heating means 12 into the furnace body 2 as the concentration reducing gas by the processing gas introducing means 3. It can be introduced (as a return port) via both the air supply port 22 and the first heating means 11 (as a return port), and introduced (as a return port) via one of them (as a return port). ). In this case, it is preferable to select a case where the furnace temperature controllability is excellent according to the design concept of the furnace.
- a low oxygen gas 9a of a different system from the processing gas 7 is provided inside the furnace body 20. It is preferable that the device further includes a low-oxygen gas introducing means 9 that can be introduced. In particular, when it is difficult to achieve a desired oxygen concentration only by circulating the processing gas 7, it is effective as a means for forcibly reducing the oxygen concentration.
- the concept in addition to the processing gas 7 (the heat exchange gas 8 when using the heat exchange means 4 described later), the concept includes a mixed gas of the processing gas 7 (heat exchange gas 8) and the low oxygen gas 9a.
- the gas (in other words, the gas introduced cyclically into the furnace body) is sometimes referred to as “circulating gas 7a”.
- the low oxygen gas 9a include an inert gas such as argon and nitrogen, and boiler exhaust gas.
- the low-oxygen gas introducing means 9 include a means capable of introducing the low-oxygen gas 9a described above, for example, a piping system connected to a low-oxygen gas generator, a boiler, or the like. In this case, the low oxygen gas introducing means 9 is installed in place of the processing gas introducing means 3 which may be installed in addition to the processing gas introducing means 3 as described above, according to the design concept of the entire furnace. Is also good.
- the low oxygen gas introducing means 9 may be connected to both the air supply port 22 and the first heating means 11 or may be connected to either V or any one of them.
- the organic substance used in the present embodiment is not particularly limited, and examples of the organic binder include polybutyl alcohol, polyethylene glycol, starch, methyl cellulose, canoleboxymethinoresenorelose, and hydroxyethinoresenorelose.
- Hydroxypropinolemethinole cellulose polyethylene oxide, sodium polyacrylate, polyacrylamide, polyvinyl butyral, ethyl cellulose, cellulose acetate, polyethylene, ethylene vinyl acetate copolymer, polypropylene, polystyrene, acrylic resin
- Preferred examples include those containing at least one selected from the group consisting of polyamide resin, glycerin, polyethylene glycol and dibutyl phthalate.
- the defatted material 5 described later is a porous material, as the pore-forming material, in addition to the particles made of the polymer used in the organic binder described above, natural organic particles such as starch and rice hull, and a molecular weight of 1000
- natural organic particles such as starch and rice hull
- examples include the following particles made of hydrocarbons such as paraffin, and particles having a molecular weight of 1000 or less and having organic ester power. These are decomposed by combustion to generate decomposition gases of organic substances such as methyl alcohol, acetoaldehyde, methyl formate, carbon dioxide, carbon monoxide, water, and tar.
- FIG. 2 shows the relationship between temperature and weight change when polyvinyl alcohol sufficiently dried at 80 ° C. as an organic substance was heated at a rate of 5 ° C.Z in three types of airflows.
- FIG. 3 shows the relationship between the temperature and the calorific value at that time.
- the calorific value is suppressed to less than half of the oxygen content of 20%, indicating that the organic decomposition gas is volatilized without burning much.
- Fig. 2 when there is no oxygen (at 100% nitrogen), about 8% of the weight remains, that is, carbonized components remain even if the temperature exceeds 400 ° C. However, after this, if the temperature rises, it will burn out. With this configuration, the time required for degreasing in the furnace can be reduced to about 1Z2 in the related art.
- the object to be degreased used in the present embodiment is not particularly limited, and examples thereof include a ceramic structure.
- the composition of the ceramic material is not particularly limited.
- an oxide-based ceramic for example, a ceramic powder which also has an alumina force, contains an organic substance in an amount of 120% by mass.
- the object 5 to be degreased is a porous body, and
- the ratio of the volume of the nonflammable and Z or nonvolatile inorganic compound remaining in the degreased material 5 without being removed even after the degreasing to the volume of the iron [(removed even after the degreasing Effective when the sum of the volumes of non-flammable and Z or non-volatile inorganic compounds that will remain in the degreased material without being removed, and the apparent volume of the degreased material) X 100] is 5-60%
- the effect is more effective when it is 5-40%, and it is particularly effective when it is 5-20%.
- the degreased material 5 when the degreased material 5 is a porous material, the degreased material 5 contains an organic pore-forming material in addition to the organic binder, and the content of the organic material may increase more than usual.
- the heat diffusion is smaller and the gas diffusion is larger than in the normal case, and abnormal combustion easily occurs inside the object 5 during degreasing.
- the material strength is low and the material is weak to the stress generated during degreasing. Therefore, when the material 5 to be degreased is a porous body, the effect is most effectively exerted.
- nonflammable and / or non-volatile inorganic compounds do not include carbonaceous materials such as graphite and graphite, and "the volume of apparent appearance of the degreased material 5". Includes the volume (volume) of small voids such as small independent holes, continuous holes, grooves, etc., present in the material 5 to be degreased, but large independent holes with a maximum inscribed sphere diameter of 10 mm or more. The volume (volume) of large voids such as holes and grooves is not included.
- the heating means 1 (the first heating means 11 and the second heating means 12) used in the present embodiment are not particularly limited, and include, for example, a heavy oil burner, a gas burner, an electric heater, and a Rigiene burner. And the like.
- the second heating means 12 may be a catalytic combustion method in which an oxidation catalyst such as platinum is added to the direct combustion method described above. Configuration like this By doing so, the combustion removal of organic matter decomposition gas can be performed efficiently, and the heating temperature of the degreased gas can be kept lower than when a catalyst is not used (direct combustion method).
- the heating temperature of the degreasing gas can be 300-350 ° C).
- the number of the heating units 1 may be one or more.
- the processing gas introduction means 3 used in the present embodiment is not particularly limited.
- an airtight pipe 3a for communicating the second heating means 12 with the furnace main body 2 is mentioned as a preferred example.
- a flue using a brick, a heat insulating material, or the like may be used.
- the circulation of the processing gas 7 (circulation gas 7a) can be performed by the circulation blower 3b.
- a heat exchange means 4 for example, heat exchange is further provided between the second heating means 12 and the processing gas introduction means 3.
- the processing gas 7 that has passed through the heat exchange means 4 becomes a heat exchange gas 8 at a lower temperature than the processing gas 7 and is introduced into the air supply port 22.
- the heat exchange means 4 there can be mentioned a device for directly mixing water in the flow path of the processing gas 7 by spraying or the like in order to cool the processing gas 7.
- this device When this device is used, the sprayed water becomes steam and is mixed with the processing gas, so that not only lowering the temperature (recovering heat) but also lowering the oxygen concentration can be achieved.
- Degreasing gas 6 (close to the gas composition and ambient temperature present inside the furnace body 20) contains a high concentration of organic decomposition gas, has a low oxygen gas concentration, and is at a moderate temperature.
- the processing gas 7 contains almost no organic decomposition gas, has a low oxygen gas concentration, and has a high temperature.
- the heat exchange gas 8 contains almost no organic decomposition gas, has a low oxygen gas concentration, and has a low temperature.
- the degreasing gas 6 is composed of an organic matter decomposed gas of 11 to 15% by volume, an oxygen gas of 0.5 to 17% by volume, and a temperature of 100 to 400 ° C.
- Degreasing time is dependent on 50% of the future.
- the composition of the processing gas 7 is 0.5-17% by volume of oxygen gas, and the temperature of the gas heated by the second heating means (afterburner) is 500-900 ° C.
- the composition of the heat exchange gas 8 is 0.5-17% by volume of oxygen gas, and its temperature is preferably the furnace temperature during degreasing + 1-+ 100 ° C! /.
- the oxygen gas concentration in the inside 20 of the furnace main body can be maintained at a low concentration of 0.5 to 17% by volume. it can.
- a degreased material (ceramic molded body) 5 containing an organic substance is installed in an interior 20 of a furnace main body composed of a heat insulating material. Heated by heating means (burner) 11. The atmosphere in the furnace body 2 gradually rises due to the heat from the burner 11. When the furnace temperature exceeds 100 ° C, organic matter decomposition gas starts to be generated from the degreased material (ceramic molded body) 5. The cracked gas is sent from the exhaust port 21 of the furnace body 2 to the second heating means (afterburner) 12 through the processing gas introduction means (flue) 3 and burned.
- the processing gas 7 heated to a high temperature by the combustion enters the heat exchange means (heat exchanger) 4, and the temperature is set in the furnace body 2 as a heat exchange gas 8 cooled to a temperature close to the furnace temperature V ⁇ . It is fed via the air supply port 22 and Z or the first heating means (burner) 11.
- the low oxygen gas introducing means 9 causes the low oxygen gas 9a of a different system from the processing gas 7 to be formed inside the furnace body 20 and It may be fed through Z or the first heating means (burner) 11.
- processing gas 7 heat exchange gas 8, low oxygen gas 9a
- first heating means burner 11
- selection and control can be appropriately performed by an operation such as switching according to the idea.
- the force for operating both the processing gas introduction means 3 (processing gas 7, heat exchange gas 8) and the low oxygen gas introduction means 9 (low oxygen gas 9a), or whether to operate only one of them It is preferable that selection and control can be appropriately performed by an operation such as switching according to the design concept (for example, controlling the total air volume of the circulating gas 7a).
- the circulating gas 7a to be sent preferably has a sufficient air volume so that the organic matter decomposition gas generated in the furnace can be efficiently exhausted through the exhaust port 21.
- the flow rate of the circulating gas 7a is preferably in the range of 1 to 100 per minute, more preferably in the range of 10 to 50 per minute. If the air volume is less than 1, it takes time to discharge the organic matter decomposition gas 6. If it exceeds 100, if the furnace is large, the air volume and temperature are maintained, so blowers, burners, heat exchange ⁇ , etc. However, they need to be large and large in capacity and are not efficient.
- a furnace 10 including a heating means 1 and a furnace body 2 is used.
- An exhaust port 21 for discharging the degreasing gas 6 containing a high concentration of organic matter decomposition gas and low concentration oxygen gas generated inside the furnace body 20 during degreasing, and an organic substance by reducing the concentration of organic matter decomposition gas from outside It has an air supply port 22 for taking in gas for concentration reduction to prevent explosion of decomposition gas, and the heating means 1 can heat and degrease the degreased material 5 stored in the furnace body 2
- the first heating means 11 and the degreasing gas 6 discharged from the exhaust port 21 of the furnace body 2 are heated to A second heating means 12 for removing the decomposed gas and treating the treatment gas 7 containing a low-concentration oxygen gas; and treating the treatment gas 7 (circulating gas 7a) with the second heating means 12 From the inside of the furnace main body 20, a processing gas introducing means 3 that further introduces as a concentration reducing gas through the air supply port 22 and the Z or the first heating means 11 is used.
- (Circulating gas 7a) is circulated through the inside of the furnace body 20, the exhaust port 21, the second heating means 12, the processing gas introducing means 3, and the air supply ports 22 and Z or the first heating means 11. This reduces the concentration of organic matter decomposition gas inside the furnace body 20 to prevent explosion, and maintains the oxygen gas concentration inside the furnace body 20 at a low concentration to cause abnormal combustion of the organic matter decomposition gas. Prevent cracks in the degreased material 5 and quickly Degreased fat product 5, characterized that it is possible to shift to the next firing process.
- the furnace shown in Fig. 1 can be suitably used.
- the force described mainly on the form using a gas burner is used.
- a furnace using a gas burner may be used. If a sufficient amount of circulating gas can be supplied and the oxygen concentration can be controlled, a furnace using an electric furnace may be used.
- a hybrid type furnace using an electric heater and a gas burner in combination may be used (the same applies to a fourth embodiment of the present invention described later).
- the processing gas 7 (circulating gas 7a) that does not operate the first heating means 11 in the embodiment of the furnace of the first invention is supplied to the inside of the furnace main body 20 and the exhaust port.
- the degreased material 5 may be degreased by circulating through the 21, the second heating means 12, the processing gas introduction means 3, and the air supply port 22.
- the heat exchange efficiency adjusting means when the boiler is operated as the heat exchange means 4, as the heat exchange efficiency adjusting means, the water level in the boiler vessel is adjusted, the gas temperature at the boiler outlet is controlled, and the temperature inside the furnace body is adjusted. It is preferable to attach a controllable device. With this configuration, the same effect as that of the degreasing method according to the fourth invention described later can be exerted. That is, degreasing can be performed easily and efficiently.
- FIG. 4 is an explanatory view schematically showing one embodiment of the present invention (furnace of the second invention and degreasing method of the fourth invention).
- a heating means and a degreased substance 5 containing an organic substance contained in the interior 20 are heated by the heating means.
- Means 13 (This third heating means 13 is the second heating means 1 in the furnace of the first invention.
- the processing gas 7 (circulating gas 7a) is supplied from the third heating means 13 to the inside 20 of the furnace body as a concentration reducing gas as a gas supply port.
- Gas 7 (circulating gas 7a) reduces the concentration of organic matter decomposition gas inside the furnace body 20 to prevent explosion, while maintaining the oxygen gas concentration inside the furnace body 20 at a low concentration to break down organic matter. It is characterized by preventing the occurrence of cracks in the degreased object 5 due to abnormal combustion of the gas, degreasing the degreased object 5 in a short time, and transferring to the next firing process. is there.
- the difference between the present embodiment (embodiment of the furnace of the second invention) and the embodiment of the furnace of the first invention is that
- the first heating means 11 in the embodiment of the furnace of the first invention shown in FIG. 1 is not installed, and the temperature of the furnace main body is changed to the third heating means 13, the heat exchange means 4, the low oxygen gas. It is only controlled by the introduction means 9 etc.
- the furnace can be configured in the same manner as the embodiment of the furnace of the first invention. With such a configuration, degreasing can be performed easily and efficiently.
- one embodiment of the degreasing method of the present invention uses a furnace provided with a heating means and a furnace main body 2 so that the inside of the furnace main body 2 is
- This is a degreasing method in which the degreased matter containing the organic matter contained in the furnace is heated and degreased by heating means, and the process proceeds to the next firing process.
- the furnace body 2 is used as a furnace when the degreased matter 5 is degreased.
- a process gas in which the processing gas 7 (circulating gas 7a) is introduced from the third heating means 13 into the inner part 20 of the furnace body as a concentration reducing gas through the supply port 22.
- the processing gas is circulated through the inside of the furnace body 20, the exhaust port 21, the third heating means 13, the processing gas introduction means 3, and the air supply port 22.
- the difference between the present embodiment (the embodiment of the degreasing method of the fourth invention) and the embodiment of the degreasing method of the third invention is that In the case of, a furnace different from the furnace in which the first heating means 11 used in the degreasing method of the third invention shown in FIG. 1 is installed (a furnace in which the heating means 11 is not installed) is used, The only point is that the temperature of the furnace body is controlled by the third heating means 13, heat exchange means 4, low oxygen gas introduction means 9, and the like. Otherwise, it can be configured similarly to the embodiment of the degreasing method of the third invention. With such a configuration, degreasing can be performed easily and efficiently.
- the degreasing temperature (degreasing completion temperature) depends on the type of organic matter, It is preferable that the optimum value (for example, 350 to 500 ° C) is appropriately controlled depending on the shape, density, and the like of the object to be degreased (molded body). In addition, it is preferable that the baking temperature in the baking performed as needed after degreasing is also controlled to, for example, 1200 to 2000 ° C! /.
- the furnace 10 in this embodiment includes a furnace body 2 having a volume of 0.5 m 3 ; a first heating means (furnace burner) having a combustion capacity of 100 kW as a heating means. 11, second heating means (afterburner) with a combustion capacity of 50 kW 12; airtight piping 3a, circulating blower 3b, damper 3c as processing gas introduction means; heat exchange means, exchange heat quantity of 25kW, water quantity Boiler 4a for 1LZ (heat exchange efficiency adjusting means 4c as an auxiliary device for it), water sprayer 4b for 0.5LZ of water spray amount; and nitrogen gas introducing means 9b (nitrogen for introducing low oxygen gas)
- the one having a configuration equipped with gas 9c) was used.
- reference numeral 11a denotes a circulating gas supply port of a furnace burner
- lib denotes a fuel for a furnace burner
- 11c denotes air for a furnace burner
- 12a denotes an afterburner combustion chamber
- 12b denotes a fuel for an afterburner
- 12c denotes an afterburner.
- Burner air 5 indicates degreased material
- 6 indicates degreasing gas
- 7 indicates processing gas
- 7a indicates circulating gas
- 7b indicates exhaust gas
- 21 indicates air vent
- 22 indicates air supply port.
- the organic binder contains polybutyl alcohol, polyethylene glycol, methylcellulose, carboxymethylcellulose, and hydroxyethylcellulose in an amount of 2% by weight, each in a total amount of 10% by mass, and starch as a pore-forming material in an amount of 10% by mass. After preparing an alumina powder slurry and drying and granulating it, it has a diameter of 50 mm, a height of 100 mm, and remains in the degreased material without being removed even after degreasing. 55 porous molded bodies in which the volume ratio of Z and Z or the nonvolatile inorganic compound was about 50% were used.
- the heat exchange means was operated, its type is also shown. Further, as shown in Table 2, as the heating condition, the volume of air at 200 ° C temperature of the furnace, air 0. 5 Nm 3 Z min for the furnace burners, and circulating gas 1. 0 Nm 3 Z min, the oxygen concentration is 10 Heating was carried out under the conditions of volume%, heating rate of 20 ° CZ time, and heating time to 500 ° C of 25 hours to obtain 5 degreased products. In this case, no cracks were observed.
- Example 1 Five degreased bodies were obtained in the same manner as in Example 1, except that the operating device was changed to the one shown in Table 1 and the heating conditions were changed to those shown in Table 2. In this case, cracks were not found.
- the operation was performed by additionally using a nitrogen gas introducing means 9b (nitrogen gas 9c) as an operating device.
- Example 7 the heat exchange efficiency adjusting means 4c was operated in addition to the boiler 4a, and the temperature of the furnace was controlled by the heat exchange efficiency adjusting means 4c.
- the heat exchange efficiency adjusting means 4c can control the gas temperature at the outlet of the boiler 4a by adjusting the water level in the boiler 4a.
- the embodiment In 8 the water sprayer 4b was operated as a heat exchange means instead of the boiler 4a and operated.
- Example 7 a power furnace operated without operating the first heating means (furnace burner) 11 was not provided with the first heating means (furnace burner) 11 (see FIG. 4).
- the furnace of the second invention see the embodiment, the same operation as in Example 7 was performed.
- Example 1 Five degreased bodies were obtained in the same manner as in Example 1, except that the operating device was changed to the one shown in Table 1 and the heating conditions were changed to those shown in Table 2. That is, in Comparative Examples 13 to 13, the operation was performed without circulating the circulating gas 7a and without operating the heat exchange means (boiler 4a) and the low oxygen gas introduction means (nitrogen gas introduction means 9b). In this case, 4 bodies in Comparative Example 1 and 3 bodies in Comparative Example 2 broke down as if exploded, and the remaining 1 body (2 bodies) became two large from the center part. It was cracked.
- the furnace and the degreasing method of the present invention are suitably used for the production of various ceramic products, particularly for the production of ceramic products using a ceramic material containing an organic substance.
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- Inorganic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
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Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US10/578,192 US20070054229A1 (en) | 2003-11-17 | 2004-11-04 | Furnace and degreasing method |
JP2005515409A JP4685634B2 (ja) | 2003-11-17 | 2004-11-04 | 炉及び脱脂方法 |
DE112004002205T DE112004002205T5 (de) | 2003-11-17 | 2004-11-04 | Ofen und Entfettungsvefahren |
Applications Claiming Priority (2)
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JP2003-387175 | 2003-11-17 | ||
JP2003387175 | 2003-11-17 |
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WO2005047207A1 true WO2005047207A1 (ja) | 2005-05-26 |
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PCT/JP2004/016305 WO2005047207A1 (ja) | 2003-11-17 | 2004-11-04 | 炉及び脱脂方法 |
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US (1) | US20070054229A1 (ja) |
JP (1) | JP4685634B2 (ja) |
CN (1) | CN1882518A (ja) |
DE (1) | DE112004002205T5 (ja) |
WO (1) | WO2005047207A1 (ja) |
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JP7513188B2 (ja) | 2021-02-26 | 2024-07-09 | 株式会社島津製作所 | 脱脂炉 |
KR20230071788A (ko) | 2021-03-10 | 2023-05-23 | 가부시키가이샤 시마쓰세사쿠쇼 | 탈지로 |
KR102502166B1 (ko) * | 2022-02-16 | 2023-02-21 | 우성에스이 주식회사 | 세라믹 전자부품용 소성로에서의 탈바인더 장치 |
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JP4685634B2 (ja) | 2011-05-18 |
DE112004002205T5 (de) | 2006-10-05 |
CN1882518A (zh) | 2006-12-20 |
US20070054229A1 (en) | 2007-03-08 |
JPWO2005047207A1 (ja) | 2007-05-31 |
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