WO2002026655A1 - Structure en nid d'abeille a l'alumine, procede de fabrication correspondant, et structure en nid d'abeille de stockage thermique correspondant - Google Patents
Structure en nid d'abeille a l'alumine, procede de fabrication correspondant, et structure en nid d'abeille de stockage thermique correspondant Download PDFInfo
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- WO2002026655A1 WO2002026655A1 PCT/JP2001/007910 JP0107910W WO0226655A1 WO 2002026655 A1 WO2002026655 A1 WO 2002026655A1 JP 0107910 W JP0107910 W JP 0107910W WO 0226655 A1 WO0226655 A1 WO 0226655A1
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- alumina
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
- C04B35/111—Fine ceramics
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
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- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/0006—Honeycomb structures
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
- F23L15/02—Arrangements of regenerators
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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
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/0003—Linings or walls
- F27D1/0006—Linings or walls formed from bricks or layers with a particular composition or specific characteristics
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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
- F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
- F27D17/002—Details of the installations, e.g. fume conduits or seals
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
- F28D20/0056—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using solid heat storage material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
- F28F21/04—Constructions of heat-exchange apparatus characterised by the selection of particular materials of ceramic; of concrete; of natural stone
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
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- 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
- C04B2235/3201—Alkali metal oxides or oxide-forming salts thereof
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- 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
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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- 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
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
- C04B2235/3218—Aluminium (oxy)hydroxides, e.g. boehmite, gibbsite, alumina sol
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/72—Products characterised by the absence or the low content of specific components, e.g. alkali metal free alumina ceramics
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L2900/00—Special arrangements for supplying or treating air or oxidant for combustion; Injecting inert gas, water or steam into the combustion chamber
- F23L2900/15021—Special arrangements for supplying or treating air or oxidant for combustion; Injecting inert gas, water or steam into the combustion chamber using regenerative heat exchanger bodies with different layers of material
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/14—Thermal energy storage
Definitions
- the present invention relates to an alumina honeycomb structure for recovering waste heat in exhaust gas by alternately passing exhaust gas and a gas to be heated through a flow path composed of a through-hole, a method for manufacturing the same, and a honeycomb heat storage body using the same.
- the present invention relates to various heating furnaces using the honeycomb regenerator and a heating method thereof.
- a cordierite material having a small coefficient of thermal expansion and excellent thermal stability in a low temperature region and a heat resistant material in a high temperature region are used as the material of the heat storage 82 cam.
- the use of alumina having high corrosion resistance is disclosed.
- at least one pair of parners having a built-in honeycomb heat storage body are provided, and fuel combustion and combustion gas emission are performed alternately to thereby reduce combustion gas emission.
- the sensible heat in the combustion gas is stored in the honeycomb regenerator, and the sensible heat stored when the combustion air flows in is used to preheat the combustion air to a high temperature, and a high waste heat recovery rate can be obtained. CO2 emissions can be reduced along with the reduction.
- a corrosive substance contained in the exhaust gas undergoing heat exchange for example, an alkali metal element, an iron-based metal element, etc., intervenes, and the temperature of the exhaust gas flowing into the honeycomb regenerator is 100 ° C. or more. Degradation and life shortening due to the reaction with the alumina honeycomb structure began to appear in the following region, and became remarkable at 130 ° C or higher.
- the temperature inside the furnace is high, the temperature of exhaust gas used for heat exchange is as high as over 130 ° C at the highest temperature, and the scale corrosion substances from the heated steel
- the combustion gas contained an alkaline component in the alumina honeycomb structure, the reaction promoted the deterioration of the alumina honeycomb structure.
- a method of mixing a cooling air into a part of the exhaust gas flowing into the honeycomb heat storage body can be considered, but there is a problem that energy efficiency is reduced.
- by-product gases such as blast furnace gas (BFG), coke oven gas (COG), and converter gas (LDG) generated at integrated steelworks contain a small amount of alkali components. . Therefore, these by-product gases are used as fuel (generally, these by-product gases are mixed and used as M gas).
- BFG blast furnace gas
- COG coke oven gas
- LDG converter gas
- An object of the present invention is to solve the above-mentioned problems, to provide an alumina honeycomb structure capable of efficiently performing heat exchange even in an atmosphere in which metal dust is scattered and in a corrosive atmosphere, a method of manufacturing the same, and a honeycomb heat storage using the same. It is an object of the present invention to provide various heating furnaces using the heat storage body and the honeycomb regenerator and a heating method thereof.
- the first invention of the alumina honeycomb structure of the present invention is characterized in that the mass of impurities is 2% by weight or less and the main component is alumina.
- the first invention of the method for producing an alumina honeycomb structure of the present invention comprises: 97% by weight to 70% by weight of ⁇ -alumina, 3% by weight to 30% by weight of aluminum hydroxide, a forming aid, and a solvent. It is characterized by being plasticized by addition and mixing, extruded, then fired, and the main crystal phase is made to be 0! Alumina. Further, the first invention of the honeycomb heat storage body of the present invention is provided with at least one of the above-described aluminum 82-cam structures, and is configured so that the gas to be heated and the gas to be heated are alternately passed to exchange heat. It is characterized by the following.
- the mass of the impurities is set to 2% by weight or less, whereby the heat storage body used in the heating furnace for steel is provided. Also, the reaction with the impurities in the alumina honeycomb structure due to the steel scale is small, and the life of the heat storage body can be prolonged.
- alumina honeycomb structure of the present invention 97 to 70% by weight of ⁇ -alumina and 3 to 30% by weight of aluminum hydroxide are used as raw materials, An alumina honeycomb structure excellent in formability can be obtained while maintaining the purity. ⁇ ⁇
- the porosity can be reduced even at low temperature firing. If the amount of alumina is more than 97% by weight and the amount of aluminum hydroxide is less than 3% by weight, it is difficult to obtain the effect of improving the formability by aluminum hydroxide. If the content is less than 30% by weight of aluminum hydroxide, shrinkage at the time of firing becomes large, so that it becomes easy to crack during the firing process.
- the plasticity becomes too high, and the shape retention for extrusion molding is deteriorated, resulting in poor dimensional accuracy. If a honeycomb structure with poor dimensional accuracy is used, a gap is created between the honeycomb combinations, and the heated exhaust gas or combustion air passes through the honeycomb side walls without heat exchange, causing a thermal shock and causing the honeycomb to break. It will be easier. Further, it is preferable to set the firing temperature to 150 ° C. or higher, preferably to 157 ° C. or higher, since a preferable porosity and crystal phase can be obtained. Suitable examples of the first invention of the alumina Nono honeycomb structure of the present invention, the porosity 50% or less, preferably to 1 5% or less, the thermal expansion coefficient of 8.
- the main crystal phase may be alumina, and the mass of impurities in the above-mentioned alumina honeycomb structure may be 1% by weight or less.
- the effect of the present invention to enhance the corrosion resistance can be more effectively exerted.
- the present invention which is inexpensive and has excellent corrosion resistance, is effective.
- the honeycomb heat storage body of the present invention at least one pair of the above-described honeycomb heat storage bodies is provided, and when one is in a heat storage state, the other is in a heat radiation state, and this state is switched. Heat exchange to form a switchable heat storage parner.
- the problem of short life due to deterioration (clogging, collapse) of the honeycomb heat storage body due to corrosion can be more effectively solved, especially in the use of 100 or more, and the running cost can be reduced. Becomes possible.
- a heating furnace using the above-described switchable heat storage parner / a steel heating furnace.
- the heating furnace it is possible to more effectively prevent an increase in the toll cost due to the inferiority of the honeycomb heat storage body and an increase in the manufacturing cost of the object to be heated.
- a steel heating furnace it is possible to not only effectively prevent an increase in the total cost and the manufacturing cost of the object to be heated as in the case of the heating furnace, but also in addition to steel. In this case, since the incorporation of iron-based elements into the exhaust gas is inevitable, it is possible to more effectively solve the problem that the honeycomb regenerator easily deteriorates.
- the second invention of the alumina honeycomb structure according to the present invention is characterized in that the alumina as a main component is 98% by weight or more, and the Na 20 amount in terms of oxide of a compound containing Na is 0.02% by weight to 1%. 0.0% by weight, with the balance being impurities.
- the second invention of the method for manufacturing an alumina honeycomb structure according to the present invention comprises: 97% by weight to 70% by weight of alumina; 3% by weight to 30% by weight of aluminum hydroxide; It is characterized by plasticizing by adding and mixing agents and solvents, extruding, and then firing.
- the second invention of the honeycomb thermal storage body of the present invention is characterized in that the honeycomb thermal storage body includes at least one Na-containing alumina honeycomb structure as described above, and is configured to alternately pass a heating gas and a gas to be heated and to exchange heat. It is a feature.
- the amount of Na 20 in terms of oxide is contained in the range of 0.02 to 1.0% by weight. It captures a part of Na, K, etc. that comes into contact with flying objects, and has the effect of mitigating the reaction with scale.
- N a 2 it is possible to prevent easily densified reaction even at low temperatures firing during manufacture of the honeycomb structure. If the Na 2 mass is less than 0.02% by weight, the reaction mitigation effect of Na, K, etc. will not be produced, and the effect of densification during production will not be exhibited.
- alumina honeycomb structure excellent in formability can be obtained while maintaining the purity.
- alumina exceeds 97% by weight If the content is less than 3% by weight, it is difficult to obtain the effect of improving the formability by ⁇ aluminum oxide. If the content of alumina is less than 70% by weight and the content of aluminum hydroxide exceeds 30% by weight, rapid shrinkage during firing will occur. Is generated, so that cracks increase in the firing process.
- the source material of the Na source is not particularly limited, and it is possible to use alumina or aluminum hydroxide which has a large Na 20 amount as the raw material, but it is preferable to use sodium aluminate because it is easy to handle.
- the firing temperature at 145 ° C. or higher, preferably at 155 ° C. or higher, favorable porosity and a crystalline phase can be obtained.
- the second aspect of the honeycomb heat storage body of the present invention at least one pair of the above-described honeycomb heat storage bodies is provided, and when one is in a heat storage state, the other is in a heat dissipation state, and this state is switched.
- a switchable heat storage burner the problem of short life due to deterioration (clogging and collapse) of the honeycomb heat storage body due to corrosion can be more effectively solved particularly at a temperature of 100 ° C or more, and the running cost can be reduced. Can be reduced.
- a heating furnace using the above-described switchable heat storage parner / a steel heating furnace.
- the heating furnace it is possible to more effectively prevent an increase in total cost due to inferiority of the honeycomb heat storage body and an increase in manufacturing cost of the object to be heated.
- a steel heating furnace is configured, the increase in total cost and the cost of manufacturing the object to be heated can be prevented more effectively, as in the case of the heating furnace.
- the problem that the honeycomb regenerator easily deteriorates can be more effectively solved because iron-based elements are inevitably mixed into the exhaust gas.
- the use of a heat storage parner keeps the flame temperature constant and makes the temperature distribution in the furnace uniform. It is possible to improve the product quality by performing uniform heating.
- FIG. 1 is a diagram showing a configuration of an example of the first or second invention of the alumina honeycomb structure of the present invention
- FIG. 2 is a diagram showing a configuration of an example of a honeycomb heat storage body of the present invention using the alumina honeycomb structure shown in FIG. 1,
- FIG. 3 is a diagram showing a configuration of an example of a switchable heat storage burner using the honeycomb heat storage body of the present invention.
- alumina honeycomb structures of the first and second inventions of the present invention the manufacturing method thereof, the honeycomb heat storage body, the switchable heat storage parner, the heating furnace, and the heating method thereof will be described.
- FIG. 1 is a diagram showing a configuration of an example of the alumina honeycomb structure of the first or second invention of the present invention.
- the alumina honeycomb structure 1 of the present invention is configured such that a plurality of through-holes 3 arranged in parallel with each other are defined by cell walls 4 inside an outer wall 2.
- the structure of the alumina honeycomb structure 1 is the same as a conventionally known structure.
- the composition thereof is a ceramic whose impurity is 2% by weight or less, preferably 1% by weight or less and whose main component is alumina. .
- the first invention of the alumina honeycomb structure 1 described above can be manufactured according to the following manufacturing method. First, 97% to 70% by weight of alumina with little impurities, 3% to 30% by weight of aluminum hydroxide, and a molding aid are prepared. Next, Prepared 0: Alumina, aluminum hydroxide, and molding aid are added to a solvent, mixed and plasticized to obtain a clay. Next, the kneaded clay obtained by plasticization is extruded using a die to obtain a formed body having a honeycomb structure. Next, the obtained molded body is fired in an oxidizing atmosphere at a temperature of 150 ° C. or more, preferably 157 ° C. or more, to obtain an alumina honeycomb structure 1 whose main crystal phase is ⁇ -alumina. ing.
- the ceramic is made from 0.02% by weight to 1.0% by weight, and the balance is made of impurities.
- the porosity of the N a content alumina honeycomb structure 1 0 1 5 0% or less, preferably to 1 5% or less, the thermal expansion coefficient of 8. 5 X 1 0 _ 6 / ° C or less
- the main crystal phase is alumina.
- the second invention of the alumina honeycomb structure 1 described above can be manufactured according to the following manufacturing method.
- the source material of sodium is not particularly limited, but it is preferable to use sodium aluminate because it is easy to handle.
- the prepared ⁇ -alumina, aluminum hydroxide, sodium source material and a molding aid are added to a solvent, mixed and plasticized to obtain a clay.
- the kneaded clay obtained by plasticization is extruded using a die to obtain a formed body having a honeycomb structure.
- the obtained molded body is fired in an oxidizing atmosphere at a temperature of at least 145 ° C., preferably at least 550 ° C., so that the Na-containing aluminum honeycomb structure having a main crystal phase of ⁇ -alumina. Have got one.
- FIG. 2 is a diagram showing a configuration of an example of the first or second invention of the honeycomb heat storage body of the present invention.
- the honeycomb regenerator 11 is formed by stacking a plurality of rectangular parallelepiped honeycomb structures 1 and 12 so that a flow path composed of through holes 13 is aligned in one direction (here, 5 layers).
- the above-described alumina honeycomb structure of the present invention is provided on the high temperature side in contact with the exhaust gas in the upper part of the figure.
- the structure 1 is provided, and a honeycomb structure 12 made of a material such as cordierite or mullite and having the same configuration as the example shown in FIG. 1 is provided on the other lower temperature side in the figure.
- the alumina honeycomb structure 1 with reduced impurities according to the present invention is used as the high-temperature side honeycomb structure directly exposed to high-temperature exhaust gas. Therefore, even in a corrosive atmosphere, deterioration of the honeycomb structure on the high-temperature side can be prevented, and as a result, the life of the honeycomb heat storage body 11 can be extended.
- FIG. 3 is a diagram showing a configuration of an example of a switchable heat storage burner using the honeycomb heat storage body 11 of the present invention.
- 21 is a combustion chamber
- 22-1, 22-2 are honeycomb heat storage bodies having the structure shown in FIG. 2
- 23-1, 23-2 are honeycomb bodies.
- a heat exchanger composed of the cam regenerators 22-1, 22-2, 24-1 and 24-2 are fuel inlets provided in the heat exchangers 23-1, 23-2. .
- the two heat exchangers 23-1 and 23-2 are provided because when one is in the heat storage state by flowing high-temperature exhaust gas, the other is simultaneously heated.
- the heating furnace can be configured by using the combustion chamber 21 of the switchable heat storage parner 31 shown in FIG. 3 as the combustion chamber of the heating furnace. Even if the substance is heated using the heating furnace, the 82-cam heat storage body 11 does not deteriorate, so that the total cost and the manufacturing cost of the object to be heated can be reduced.
- a steel heating furnace can be configured by using the combustion chamber 21 of the switchable heat storage parner 31 shown in FIG. 3 as the combustion chamber of the steel heating furnace.
- Example 1 First invention of alumina 82 cam structure
- ⁇ -alumina raw material As an ⁇ -alumina raw material and a hydroxylamine aluminum raw material, ⁇ -alumina ⁇ , ⁇ -alumina ⁇ , ⁇ -alumina C, halmina D and aluminum hydroxide A having different amounts of impurities as shown in Table 1 below.
- Aluminum hydroxide B and aluminum hydroxide C were prepared.
- impurity amount was calculated by subtracting the A 1 2 0 3 from excluding the oxide conversion and Tsuyonetsu remaining (Ig-Loss).
- the prepared various alumina raw materials and aluminum hydroxide raw materials were mixed at the mixing ratio shown in Table 2 below, and methylcellulose and water were added thereto and further mixed and plasticized to obtain various clays.
- the obtained kneaded material was extruded and fired in an oxidizing atmosphere to obtain a honeycomb formed body having a wall thickness of 0.43 mm and a number of cells of 15.5 cells / "square centimeter.
- the obtained honeycomb formed body was obtained.
- the samples were fired at the firing temperatures shown in Table 2 below to obtain alumina honeycomb structures of the present invention examples and comparative examples of samples No. T1 to T16.
- Example 2 (second invention of alumina 82-cam structure)
- a alumina raw material, aluminum hydroxide raw material and Natoriumu source material the following table 3 as shown in Table 5
- Table 3 A 1 2 0 3 amount, non-alumina having a N a 2 ⁇ amount A- E (Table 3) , Aluminum hydroxide A-D (Table 4) and sodium aluminate A (Table 5) were prepared.
- the prepared alumina raw material, 7j aluminum oxide raw material and sodium source raw material were mixed at the mixing ratio shown in Table 6 below and plasticized to obtain various clays.
- the obtained clay was extruded to obtain a honeycomb formed body having a wall thickness of 0.43 mm and a cell number of 15.5 cells / cm 2. After drying the obtained honeycomb formed body, it was fired at the firing temperatures shown in Table 6 below to obtain sample-containing No. 1 to 15 Na-containing alumina honeycomb structures of Examples of the present invention and Comparative Examples.
- the obtained aluminum honeycomb structure was measured for alumina purity (impurity concentration), porosity, and coefficient of thermal expansion (CTE).
- a heat exchanger for heat exchange was fabricated by combining the alumina honeycomb structures, and a real furnace durability test was performed in a steel heating furnace. After one year of use, their appearance and dimensions were measured to determine the degree of deterioration. The results are shown in Table 6 below. Incidentally, in Table 6, the A 1 2 0 3 purity (quantity) and N a 2 ⁇ amount of a mixture are also shown. No. a-alumina Oi alumina hydroxide aluminate aluminate Al 2 0 3 Na 2 0 combustion temperature moldability porosity GTE 1 year Started after use Remarks
- N a 2 ⁇ amount A 1 2 0 3 amount 9 8% by weight or more 0.0 2 to 1.0 wt% of one, or not at all deteriorated with the appearance and size, and degraded
- N a 2 ⁇ amount or A 1 2 ⁇ 3 amount is less than 9 8 wt% to zero. Less than 0 2% by weight or 1. 0 for more than% by weight, such as sodium alumina honeycomb structural body in The impurities reacted with the scale and were clearly degraded after one year of use.
- the preparation amount of ⁇ -alumina is 97 to 70% by weight and the preparation amount of aluminum hydroxide is 3 to 30% by weight.
- the amount is not the amount%, it is understood that although the deterioration is good, the clay is plasticized too much and the formability is deteriorated.
- the mass of the impurities is set to 2% by weight or less, it is difficult to use the heating furnace for steel. Even with the heat storage material used, there is little reaction with impurities in the alumina honeycomb structure due to the steel scale, and the life of the heat storage material can be extended.
- the method for manufacturing an alumina honeycomb structure of the present invention since 97 to 70% by weight of ⁇ -alumina and 3 to 30% by weight of ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ aluminum oxide are used as raw materials, high purity is maintained. An alumina honeycomb structure excellent in formability can be obtained as it is.
- 0.0 to N a 2 0 amount is the amount of alumina as the main component 9 8 wt% or more 2 Since the content is set to 1.0% by weight, even if the heat storage material used in the steel heating furnace is used, the reaction with the impurities in the alumina honeycomb structure due to the steel scale is small, and the life of the heat storage material can be prolonged. In addition, by setting the & 20 content to 0.02% by weight to 1.0% by weight, Na and K etc. in the gas are taken up, the reaction is reduced, and the life is extended. Density and low porosity even at low temperature firing during manufacturing It can improve the durability against flying objects.
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/380,421 US20040023180A1 (en) | 2000-09-26 | 2001-09-12 | Alumina honeycomb structure, method for manufacture of the same, and heat-storing honeycomb structure using the same |
AU2001286200A AU2001286200A1 (en) | 2000-09-26 | 2001-09-12 | Alumina honeycomb structure, method for manufacture of the same, and heat-storing honeycomb structure using the same |
EP01965581A EP1325898A4 (en) | 2000-09-26 | 2001-09-12 | ALUMINUM OXIDE WAVE STRUCTURE, METHOD FOR THE PRODUCTION THEREOF AND HEAT-STORING WAVE STRUCTURE AND THEIR USE |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000291711A JP2002098489A (ja) | 2000-09-26 | 2000-09-26 | Na含有アルミナハニカム構造体、その製造方法及びそれを用いたハニカム蓄熱体 |
JP2000-291709 | 2000-09-26 | ||
JP2000-291711 | 2000-09-26 | ||
JP2000291709A JP2002098488A (ja) | 2000-09-26 | 2000-09-26 | アルミナハニカム構造体、その製造方法及びそれを用いたハニカム蓄熱体 |
Publications (1)
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WO2002026655A1 true WO2002026655A1 (fr) | 2002-04-04 |
Family
ID=26600710
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2001/007910 WO2002026655A1 (fr) | 2000-09-26 | 2001-09-12 | Structure en nid d'abeille a l'alumine, procede de fabrication correspondant, et structure en nid d'abeille de stockage thermique correspondant |
Country Status (5)
Country | Link |
---|---|
US (1) | US20040023180A1 (ja) |
EP (1) | EP1325898A4 (ja) |
AU (1) | AU2001286200A1 (ja) |
TW (1) | TW494223B (ja) |
WO (1) | WO2002026655A1 (ja) |
Families Citing this family (7)
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DE102008058893B3 (de) * | 2008-11-26 | 2010-03-04 | Deutsches Zentrum für Luft- und Raumfahrt e.V. | Gasdurchlässige Begrenzungswand |
US20150226499A1 (en) * | 2012-05-16 | 2015-08-13 | Babcock & Wilcox Vølund A/S | Heat Exchanger Having Enhanced Corrosion Resistance |
JP6231910B2 (ja) * | 2014-03-14 | 2017-11-15 | 日本碍子株式会社 | 目封止ハニカム構造体 |
CN106017090A (zh) * | 2016-07-27 | 2016-10-12 | 北京神雾环境能源科技集团股份有限公司 | 熔融冶炼炉 |
CN111457733A (zh) * | 2019-01-22 | 2020-07-28 | 上海闵予软件科技有限公司 | 建筑构件耐火实验炉节能环保燃烧加热系统 |
CN110372343A (zh) * | 2019-06-21 | 2019-10-25 | 中冶建筑研究总院有限公司 | 蓄热式加热炉用蜂窝体及其制备方法 |
CN112284168A (zh) * | 2019-07-25 | 2021-01-29 | 国家能源投资集团有限责任公司 | 储热装置 |
Citations (4)
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JPH03141181A (ja) * | 1989-10-24 | 1991-06-17 | Saga Pref Gov | 表面改質アルミナセラミックスの製造方法 |
JPH08245281A (ja) * | 1995-03-10 | 1996-09-24 | Sumitomo Chem Co Ltd | 遷移アルミナ成形体の製造方法 |
JPH09309773A (ja) * | 1996-03-19 | 1997-12-02 | Toyota Motor Corp | セラミック構造体 |
JPH1130491A (ja) * | 1997-07-10 | 1999-02-02 | Ngk Insulators Ltd | ハニカム状蓄熱体 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
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US5124302A (en) * | 1989-01-10 | 1992-06-23 | Corning Incorporated | Phosphate-containing structures with catalytic material distributed throughout |
EP0604987B1 (en) * | 1992-12-28 | 2002-06-19 | National Institute of Advanced Industrial Science and Technology | Removal of nitrogen oxide from exhaust gas |
JP2703728B2 (ja) * | 1994-06-17 | 1998-01-26 | 日本碍子株式会社 | ハニカム状蓄熱体 |
CA2167991C (en) * | 1995-01-25 | 1999-12-14 | Kazuhiko Kumazawa | Honeycomb regenerator |
JP2002535229A (ja) * | 1998-12-28 | 2002-10-22 | コーニング インコーポレイテッド | 高強度かつ高表面積のアルミナセラミック |
JP2000279823A (ja) * | 1999-03-31 | 2000-10-10 | Ngk Insulators Ltd | セラミックハニカム構造体及びその製造方法 |
US6706660B2 (en) * | 2001-12-18 | 2004-03-16 | Caterpillar Inc | Metal/metal oxide doped oxide catalysts having high deNOx selectivity for lean NOx exhaust aftertreatment systems |
-
2001
- 2001-09-12 AU AU2001286200A patent/AU2001286200A1/en not_active Abandoned
- 2001-09-12 EP EP01965581A patent/EP1325898A4/en not_active Withdrawn
- 2001-09-12 WO PCT/JP2001/007910 patent/WO2002026655A1/ja not_active Application Discontinuation
- 2001-09-12 US US10/380,421 patent/US20040023180A1/en not_active Abandoned
- 2001-09-25 TW TW090123548A patent/TW494223B/zh not_active IP Right Cessation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03141181A (ja) * | 1989-10-24 | 1991-06-17 | Saga Pref Gov | 表面改質アルミナセラミックスの製造方法 |
JPH08245281A (ja) * | 1995-03-10 | 1996-09-24 | Sumitomo Chem Co Ltd | 遷移アルミナ成形体の製造方法 |
JPH09309773A (ja) * | 1996-03-19 | 1997-12-02 | Toyota Motor Corp | セラミック構造体 |
JPH1130491A (ja) * | 1997-07-10 | 1999-02-02 | Ngk Insulators Ltd | ハニカム状蓄熱体 |
Non-Patent Citations (1)
Title |
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Also Published As
Publication number | Publication date |
---|---|
AU2001286200A1 (en) | 2002-04-08 |
TW494223B (en) | 2002-07-11 |
EP1325898A1 (en) | 2003-07-09 |
EP1325898A4 (en) | 2005-07-27 |
US20040023180A1 (en) | 2004-02-05 |
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