CN114485243B - Heat accumulator for alumina ceramic hollow brick heat accumulating heater and preparation method thereof - Google Patents
Heat accumulator for alumina ceramic hollow brick heat accumulating heater and preparation method thereof Download PDFInfo
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- CN114485243B CN114485243B CN202111628711.XA CN202111628711A CN114485243B CN 114485243 B CN114485243 B CN 114485243B CN 202111628711 A CN202111628711 A CN 202111628711A CN 114485243 B CN114485243 B CN 114485243B
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 239000011464 hollow brick Substances 0.000 title claims abstract description 49
- 238000002360 preparation method Methods 0.000 title abstract description 14
- 238000005338 heat storage Methods 0.000 claims abstract description 196
- 238000009825 accumulation Methods 0.000 claims abstract description 35
- 239000000919 ceramic Substances 0.000 claims abstract description 23
- 238000005520 cutting process Methods 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 19
- 238000012545 processing Methods 0.000 claims description 16
- 239000000843 powder Substances 0.000 claims description 15
- 238000005245 sintering Methods 0.000 claims description 12
- 235000015895 biscuits Nutrition 0.000 claims description 11
- 238000000227 grinding Methods 0.000 claims description 9
- 229910003460 diamond Inorganic materials 0.000 claims description 6
- 239000010432 diamond Substances 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 6
- 238000000462 isostatic pressing Methods 0.000 claims description 6
- 238000011049 filling Methods 0.000 claims description 4
- 238000011068 loading method Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 230000035939 shock Effects 0.000 abstract description 7
- 230000007547 defect Effects 0.000 abstract description 6
- 239000000463 material Substances 0.000 description 7
- 238000000748 compression moulding Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 238000005482 strain hardening Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000008358 core component Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
Classifications
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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
- F28D20/02—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat
- F28D20/023—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using latent heat the latent heat storage material being enclosed in granular particles or dispersed in a porous, fibrous or cellular structure
-
- 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
- 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
-
- 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
- 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
-
- 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
Abstract
The invention provides a heat accumulator for an alumina ceramic hollow brick heat accumulation heater, which is of a cylindrical structure assembled by a plurality of regular hexagonal prism heat accumulation blocks and side blocks formed by cutting the heat accumulation blocks; the heat storage block is axially provided with airflow through holes which are arranged in an equilateral triangle form on the cross section of the heat storage block; the heat storage blocks in each layer of the heat storage body are sequentially distributed along the circumferential direction by taking the central heat storage block as the center, and the gaps between the outer sides of the outermost heat storage blocks are filled by the edge blocks; the air flow holes of the upper and lower heat storage blocks of the heat storage body are correspondingly communicated, and the air flow holes of the upper and lower side blocks are correspondingly communicated. The invention also provides a preparation method of the heat accumulator for the alumina ceramic hollow brick heat accumulation heater. The heat accumulator for the alumina ceramic hollow brick heat accumulation heater and the preparation method thereof provided by the invention have the advantages of low ceramic defect and strong thermal shock resistance.
Description
Technical Field
The invention relates to the technical field of heaters, in particular to a heat accumulator for an alumina ceramic hollow brick heat accumulating heater and a preparation method thereof.
Background
The alumina hollow brick heat accumulating heater is one high temperature pure air heating equipment with heating airflow temperature up to 2000K level. The alumina hollow brick heat accumulating heater consists of mainly alumina heat accumulator, fireproof cylinder, heat insulating cylinder, metal casing, etc. The alumina hollow brick heat accumulator is a core component for energy storage and air flow heating.
At present, the alumina hollow brick heat accumulator is easy to generate ceramic defects in the preparation process, and the alumina hollow brick heat accumulator with high temperature is extremely easy to damage due to extremely strong high-pressure cold air flow impact in the use process. In order to meet the use requirement of the hypersonic wind tunnel, the size of the alumina hollow brick heat accumulator is extremely large, the diameter of the alumina hollow brick heat accumulator can reach 1m order, and the height of the alumina hollow brick heat accumulator can reach 5-7 m order. Therefore, when the alumina hollow brick heat accumulator is damaged and cannot be used continuously, a new alumina hollow brick heat accumulator needs to be replaced. This not only affects the production efficiency, but also brings great economic loss and affects the economic benefit.
Therefore, there is a need for an alumina hollow brick heat accumulator with low ceramic defects and strong thermal shock resistance and a preparation method thereof.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a heat accumulator for an alumina ceramic hollow brick heat accumulating heater with low ceramic defect and strong thermal shock resistance and a preparation method thereof.
In order to solve the technical problems, the invention provides a heat accumulator for an alumina ceramic hollow brick heat accumulating heater,
The heat accumulator is of a cylindrical structure assembled by a plurality of regular hexagonal prism heat accumulating blocks and side blocks formed by cutting the heat accumulating blocks;
the heat storage block is axially provided with airflow through holes which are arranged in an equilateral triangle form on the cross section of the heat storage block;
The heat storage blocks in each layer of the heat storage body are sequentially distributed along the circumferential direction by taking the central heat storage block as the center, and the gaps between the outer sides of the outermost heat storage blocks are filled by the edge blocks;
The air flow holes of the upper and lower heat storage blocks of the heat storage body are correspondingly communicated;
The height of the central heat storage block on the top layer of the heat accumulator is one half of the height of the heat storage blocks, and the heights of the heat storage blocks and the side blocks around the central heat storage block on the bottom layer of the heat accumulator are one half of the heights of the heat storage blocks.
Further, the diameter of the airflow through holes is 5-8 mm, the distance between every two adjacent airflow through holes is equal, and the distance between every two adjacent airflow through holes is 1.5-1.8 times of the diameter of the airflow through holes.
Further, the distance between the air flow through holes of the six edges of the adjacent heat storage blocks in the regular hexagonal prism heat storage block and the edges of the heat storage blocks is 1/2 times of the distance between the two adjacent air flow through holes, and the distance between the air flow through holes of the six faces of the adjacent heat storage blocks in the regular hexagonal prism heat storage block and the faces of the heat storage blocks is times of the distance between the two adjacent air flow through holes.
Further, the height of the heat storage block is 30-60 mm, and the number of the airflow through holes in the heat storage block is 19 holes, 37 holes or 61 holes.
The invention also provides a preparation method of the heat accumulator for the alumina ceramic hollow brick heat accumulation heater, which comprises the following steps:
The alpha-Al 2O3 is selected and ball-milled into alpha-Al 2O3 micro powder;
filling alpha-Al 2O3 micro powder into a columnar rubber model;
Isostatic pressing the columnar rubber model filled with the alpha-Al 2O3 micro powder into an alpha-Al 2O3 columnar biscuit;
Sintering the alpha-Al 2O3 columnar biscuit to obtain columnar ceramic blocks;
processing the upper surface and the lower surface of the columnar ceramic block, and then circumferentially processing the columnar ceramic block to obtain a non-porous regular hexagonal prism heat storage block;
processing airflow through hole positioning holes on the end faces of the non-porous regular hexagonal prism heat storage blocks, and then processing airflow through holes from the airflow through hole positioning holes respectively;
Sequentially arranging heat storage blocks in a hearth of the alumina ceramic hollow brick heat storage heater along the circumferential direction by taking a central heat storage block as a center, wherein the missing blocks between the outermost heat storage block and the hearth are filled by edge blocks;
the heat storage blocks and the side blocks are arranged in a layered manner according to the arrangement mode until the hearth is fully arranged to form a heat storage body, and meanwhile, airflow through holes of the upper layer heat storage block and the lower layer heat storage block are correspondingly communicated;
The height of the central heat storage block of the top layer is half of the height of the heat storage blocks, and the heights of the heat storage blocks and the side blocks around the central heat storage block of the bottom layer are half of the heights of the heat storage blocks.
Further, the purity of the alpha-Al 2O3 is more than 99%, and the particle size of the alpha-Al 2O3 micro powder is not more than 10nm.
Further, the isostatic pressing of the columnar rubber model filled with the alpha-Al 2O3 micro powder into the alpha-Al 2O3 columnar biscuit is carried out in a hydraulic isostatic press with a loading pressure of not less than 150 MPa.
Further, the step of sintering the alpha-Al 2O3 columnar biscuit to obtain columnar ceramic blocks is to sinter the columnar ceramic blocks in a high-temperature kiln, wherein the sintering temperature is not lower than 1700 ℃.
Further, the upper surface and the lower surface of the columnar ceramic block are processed by a diamond grinding machine, and the circumferential surface of the columnar ceramic block is processed by a cylindrical grinding machine.
Further, the positioning holes of the air flow holes are processed by an automatic grinding machine, and the air flow holes are processed by a manual drilling machine with a diamond drill bit.
According to the heat accumulator for the alumina ceramic hollow brick heat accumulation heater, each heat accumulation block is arranged into the regular hexagonal prism shape with the same size, so that the heat accumulation blocks are convenient to process, and meanwhile, the heat accumulation blocks are convenient to assemble and splice to form the heat accumulator. And the central heat storage block of the top layer of the heat storage body adopts a heat storage block with half height, the heights of the heat storage blocks and the side blocks around the central heat storage block of the bottom layer are also designed to be half of the height of the heat storage block, the heat storage body adopts the specific staggered splicing structure, the dislocation of air flow through holes between the upper layer of heat storage block and the lower layer of heat storage block can be effectively prevented, the smoothness of all the air flow through holes in the heat storage body is ensured, the quality of the heat storage body is improved, the cold air flow is ensured to uniformly flow through the heat storage body, the cold air flow impact strength in the air flow through holes of the heat storage body is ensured to be uniform, and the whole heat storage body has excellent heat shock resistance.
Meanwhile, the preparation method of the heat accumulator for the alumina ceramic hollow brick heat accumulation heater provided by the invention is characterized in that the heat accumulator is obtained through the technological processes of material selection, compression molding, sintering molding, exterior cold processing, through hole cold processing, assembly and splicing and the like. In the compression molding stage, the rubber mold serving as a soft mold is used for containing material micro powder, and a hydraulic isostatic pressing machine is used for pressing, so that all outer surfaces of the prepared columnar blank are uniformly pressed, and the phenomenon of nonuniform materials in the blank is avoided to the greatest extent. In addition, in the compression molding stage, the demolding surface is the outer surface of the columnar blank, and the expected regular hexagonal prism heat storage block can be obtained through subsequent sintering and external cold processing, so that the mold design and the mold demolding process design difficulty after compression molding are reduced under the condition that the quality of the heat storage block is not influenced. Meanwhile, the columnar blank subjected to isostatic pressing forming is subjected to surface cold forming and hole opening after being sintered to obtain a heat storage block, so that the heat storage block can be heated uniformly in the sintering process, cold forming and air flow through hole processing can be facilitated, the heat storage block with uniform material quality can be finally obtained, ceramic defects possibly occurring in the preparation process of the heat storage block can be reduced to the greatest extent, and the finally assembled heat storage body has excellent thermal shock resistance.
Drawings
FIG. 1 is a cross-sectional top view of a thermal mass for an alumina ceramic hollow brick thermal storage heater provided by an embodiment of the invention;
FIG. 2 is a longitudinal sectional view of A-A of a heat accumulator for an alumina ceramic hollow brick heat accumulation heater provided by the embodiment of the invention;
Fig. 3 is a front view of a heat storage block of a heat storage body for an alumina ceramic hollow brick heat storage heater according to an embodiment of the present invention;
Fig. 4 is a top view of a heat storage block of a heat storage body for an alumina ceramic hollow brick heat storage heater according to an embodiment of the present invention;
fig. 5 is a top view of 19 airflow through hole heat storage blocks of a heat storage body for an alumina ceramic hollow brick heat storage heater according to an embodiment of the invention;
Fig. 6 is a top view of 37 airflow through hole heat storage blocks of a heat storage body for an alumina ceramic hollow brick heat storage heater according to an embodiment of the invention;
fig. 7 is a top view of 61 airflow through hole heat storage blocks of a heat storage body for an alumina ceramic hollow brick heat storage heater according to an embodiment of the invention;
fig. 8 is a flowchart of a method for preparing a heat accumulator for an alumina ceramic hollow brick heat accumulating heater according to the embodiment of the invention.
Detailed Description
Referring to fig. 1 and 2, the heat accumulator for the alumina ceramic hollow brick heat accumulation heater provided by the embodiment of the invention is a cylindrical structure assembled by a plurality of regular hexagonal prism heat accumulation blocks and side blocks formed by cutting the heat accumulation blocks.
The heat storage blocks in each layer of the heat storage body are sequentially distributed along the circumferential direction by taking the central heat storage block as the center, and the missing blocks between the outer sides of the outermost heat storage blocks are filled by the edge blocks. Specifically, the heat accumulator is composed of m circles of heat accumulation blocks and one circle of edge blocks in the radial direction. Usually, the 1 st circle, namely the central position of the heat accumulator, is composed of 1 heat accumulating block, the 2 nd circle is composed of 6 multiplied by 1 heat accumulating blocks, and the 6 heat accumulating blocks are radially spliced outside six faces of the central heat accumulating block in sequence. The 3 rd circle is composed of 6X 2 heat storage blocks, the 12 heat storage blocks are radially spliced on the outer sides … of the 6 heat storage blocks of the 2 nd circle in sequence, the m < th > circle is composed of 6X (m-1) micro alumina hollow brick heat storage blocks and are spliced on the outer sides of the 6X (m-2) heat storage blocks of the m < th > circle in sequence. And 6× (m-1) side blocks are arranged outside the m-th circle to complement the missing blocks, and each side block is formed by cutting the complete heat storage block according to the actual circle complement requirement of the full-size heat storage body in the circumferential direction.
Referring to fig. 3 and 4, the thermal storage block is axially provided with air flow holes arranged in an equilateral triangle form on the cross section of the thermal storage block. The diameter d of each airflow through hole is 5-8 mm, the spacing S between every two adjacent airflow through holes is equal, and the spacing S between every two adjacent airflow through holes is 1.5-1.8 times of the diameter d of each airflow through hole. And the distance between the airflow through holes of the six edges of the adjacent heat storage blocks in the heat storage blocks and the edges of the heat storage blocks is 1/2 times of the distance S between the two adjacent airflow through holes, and the distance between the airflow through holes of the six faces of the adjacent heat storage blocks in the heat storage blocks and the faces of the heat storage blocks is times of the distance S between the two adjacent airflow through holes.
The height Li of the heat storage block is 30-60 mm, and the diameter of the circumscribed circle of the regular hexagonal section of the heat storage block is less than 130mm.
In order to meet the application requirements of the alumina ceramic hollow brick heat storage heater with different dimensions, the number of airflow through holes on each heat storage block of the heat storage body can be optimally selected. The smaller the number of the airflow through holes of the heat storage block and the smaller the height of the heat storage block, the easier the heat storage block is to be prepared. And the height of the heat storage block is mainly limited by the machining depth of the drilling machine tool during cold machining of the air flow through hole of the heat storage block. The fewer the number of holes of the airflow through holes, the smaller the probability of single Kong Baofei occurring during cold working of the airflow through holes, but the heat storage blocks with fewer holes of the airflow through holes can cause the difficulty of heat storage body assembly to be increased during splicing and assembly of the heat storage body. Therefore, in order to ensure the success rate of the processing of the airflow through holes of the heat storage blocks and also to ensure that the heat storage blocks are easy to assemble, the airflow through holes of the heat storage blocks of the heat storage bodies are designed to be 19 holes, 37 holes or 61 holes. Referring to fig. 5, the air flow holes in the heat storage block of the heat storage body are designed to be 19 holes. Referring to fig. 6, the air flow holes in the heat storage block of the heat storage body are designed to be 37 holes. Referring to fig. 7, the air flow holes in the heat accumulation block of the heat accumulator are designed to be 61 holes.
The heat accumulator is formed by splicing and overlapping a plurality of layers of heat accumulating blocks and side blocks up and down in height, and the whole height L of the heat accumulator is not more than 7m. And the air flow holes of the upper and lower heat storage blocks of the heat storage body are correspondingly communicated, and the air flow holes of the upper and lower side blocks are correspondingly communicated. Meanwhile, the height of the central heat storage block (namely the heat storage block of the 1 st circle) of the top layer of the heat storage body is half of the height of the normal heat storage block, namely Li/2. The heights of the heat storage blocks and the side blocks around the central heat storage block of the bottom layer of the heat storage body are half of the height of the normal heat storage block, namely Li/2. The heat accumulator adopts the specific staggered splicing structure, can prevent relative movement between the upper heat accumulation block and the lower heat accumulation block, can effectively avoid dislocation of the airflow through holes between the upper heat accumulation block and the lower heat accumulation block, ensures that each airflow through hole in the heat accumulator keeps smooth, ensures that cold airflow uniformly flows through each airflow through hole of the heat accumulator, ensures that cold airflow impact strength in the airflow through holes of the heat accumulation block is uniform, improves the quality of the heat accumulator, and ensures that the heat accumulator has excellent thermal shock resistance.
As a specific embodiment of the present invention, each layer of the heat accumulator comprises three circles of heat accumulation blocks and one circle of edge blocks. The first circle of heat storage blocks 1 are positioned at the axle center position of the heat storage body, namely the center heat storage block 1 is positioned at the center position of each layer of the heat storage body. The 2 nd circle consists of 6 heat storage blocks 2, and the 6 heat storage blocks 2 are spliced outside six surfaces of the central heat storage block 1 in sequence. The 3 rd circle is composed of 12 heat storage blocks 3, and the 12 heat storage blocks 3 are spliced outside the 6 heat storage blocks of the 2 nd circle in sequence. The outside missing blocks of the 3 rd circle heat storage block 3 are complemented by the edge blocks 4. Moreover, the heat accumulator is formed by stacking 12 layers of heat accumulating blocks up and down, wherein the height of the central heat accumulating block 1 in the top layer is one half of the height of the normal heat accumulating block, and the height of the heat accumulating blocks around the central heat accumulating block 1 in the bottom layer of the heat accumulator is one half of the height of the normal heat accumulating block. Through this kind of staggered splice structure, can prevent to take place relative movement between the upper and lower floor's heat accumulation piece, can effectively avoid the air current through-hole of upper and lower floor's heat accumulation piece to appear misplacement phenomenon, guaranteed that each air current through-hole in the heat accumulator keeps unblocked, ensure that the cold air current evenly flows each air current through-hole of heat accumulator, guarantee that cold air current impact strength is even in the heat accumulation piece air current through-hole, improved the quality of heat accumulator.
Referring to fig. 8, the preparation method of the heat accumulator for the alumina ceramic hollow brick heat accumulation heater provided by the invention comprises the following steps:
step 1) material selection: alpha-Al 2O3 with purity of more than 99% is selected and put into a ball mill, and the ball mill is carried out to obtain alpha-Al 2O3 micro powder with particle size of not more than 10 nm.
Step 2) compression molding: and uniformly filling the obtained alpha-Al 2O3 micro powder into a columnar rubber model. And then placing the columnar rubber model filled with the alpha-Al 2O3 micro powder in a hydraulic isostatic press, and isostatic pressing the alpha-Al 2O3 micro powder in the columnar rubber model into an alpha-Al 2O3 columnar biscuit with loading pressure not less than 150 MPa. In the compression molding stage, as the rubber mold is a soft mold and the pressurizing tool is a hydraulic isostatic press, all outer surfaces of the columnar blank can be ensured to be uniformly pressed in the process of pressing the columnar blank, and the problem of nonuniform materials in the columnar blank is avoided to the greatest extent.
Step 3) sintering and forming: and (3) placing the pressed alpha-Al 2O3 columnar biscuit in a high-temperature kiln for sintering at the sintering temperature of not lower than 1700 ℃ to obtain columnar ceramic blocks.
Step 4) exterior cold working: and processing the upper surface and the lower surface of the columnar ceramic block by utilizing a diamond grinding machine, then processing the circumferential surface of the columnar ceramic block by utilizing a cylindrical grinding machine, and finally processing to obtain the expected non-porous regular hexagonal prism heat storage block.
Step 5) cold working of the airflow through hole: firstly, an automatic grinding machine is utilized to process airflow through hole positioning holes on the end face of the non-porous regular hexagonal prism heat storage block, so that subsequent drilling operation is facilitated. And then, drilling all the air flow holes through the air flow hole positioning holes by adopting a manual drilling machine with a diamond drill bit, so as to obtain the heat storage block.
Step 6) assembling a heat accumulator: and placing a heat storage block serving as a central heat storage block at the center of the bottom of a hearth of the alumina ceramic hollow brick heat storage heater, sequentially arranging other heat storage blocks around the central heat storage block by taking the central heat storage block as the center, and filling the missing blocks between the outermost heat storage block and the hearth by the edge blocks. After the first layer of heat storage blocks are arranged, the second layer of heat storage blocks are arranged on the basis of the first layer of heat storage blocks, and when the heat storage blocks are arranged, the corresponding communication of the airflow through holes of the upper layer of heat storage blocks and the lower layer of heat storage blocks is ensured, and the corresponding communication of the airflow through holes of the upper layer of side blocks and the lower layer of side blocks is also ensured. The heat accumulating blocks are sequentially arranged layer by layer according to the method until the whole hearth of the alumina ceramic hollow brick heat accumulating heater is fully arranged, and a heat accumulator is formed in the hearth.
In order to prevent horizontal displacement between the upper and lower heat storage blocks and cause dislocation of air flow through holes of the upper and lower heat storage blocks, the height of the central heat storage block of the top layer is one half of the height of the normal heat storage block, and the heights of the heat storage blocks and the side blocks around the central heat storage block of the bottom layer are one half of the height of the normal heat storage block.
According to the preparation method of the heat accumulator for the alumina ceramic hollow brick heat accumulation heater, the possible ceramic defects of the heat accumulator in the preparation process are reduced to the greatest extent, and the prepared heat accumulator is uniform in material, has excellent thermal shock resistance and can meet the application requirements of the alumina hollow brick heat accumulator.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all such modifications and equivalents are intended to be encompassed in the scope of the claims of the present invention.
Claims (9)
1. The utility model provides an aluminium oxide ceramic hollow brick heat accumulation body for heat accumulation heater which characterized in that:
the heat accumulator is of a cylindrical structure assembled by a plurality of regular hexagonal prism heat accumulating blocks and side blocks formed by cutting the heat accumulating blocks;
the heat storage block is axially provided with airflow through holes which are arranged in an equilateral triangle form on the cross section of the heat storage block;
The heat storage blocks in each layer of the heat storage body are sequentially distributed along the circumferential direction by taking the central heat storage block as the center, and the gaps between the outer sides of the outermost heat storage blocks are filled by the edge blocks;
The air flow holes of the upper and lower heat storage blocks of the heat storage body are correspondingly communicated;
the height of the central heat storage block on the top layer of the heat accumulator is one half of the height of the heat storage blocks, and the heights of the heat storage blocks and the side blocks around the central heat storage block on the bottom layer of the heat accumulator are one half of the heights of the heat storage blocks;
The heat accumulator is formed by splicing and overlapping a plurality of layers of heat accumulating blocks and side blocks up and down in height, the height of the heat accumulating blocks is 30-60 mm, the number of airflow through holes in the heat accumulating blocks is 19 holes, 37 holes or 61 holes, and the whole height of the heat accumulator is not more than 7m.
2. The heat accumulator for an alumina ceramic hollow brick heat accumulating heater according to claim 1, wherein: the diameter of the airflow through holes is 5-8 mm, the distance between every two adjacent airflow through holes is equal, and the distance between every two adjacent airflow through holes is 1.5-1.8 times of the diameter of the airflow through holes.
3. The heat accumulator for an alumina ceramic hollow brick heat accumulating heater according to claim 2, wherein: the distance between the air flow through holes of the six edges of the adjacent heat storage blocks in the regular hexagonal prism heat storage blocks and the heat storage block edges is 1/2 times of the distance between the two adjacent air flow through holes, and the distance between the air flow through holes of the six faces of the adjacent heat storage blocks in the regular hexagonal prism heat storage blocks and the heat storage block faces is times of the distance between the two adjacent air flow through holes.
4. A method for producing a heat accumulator for an alumina ceramic hollow brick heat accumulating heater according to any one of claims 1 to 3, comprising the steps of:
The alpha-Al 2O3 is selected and ball-milled into alpha-Al 2O3 micro powder;
filling alpha-Al 2O3 micro powder into a columnar rubber model;
Isostatic pressing the columnar rubber model filled with the alpha-Al 2O3 micro powder into an alpha-Al 2O3 columnar biscuit;
Sintering the alpha-Al 2O3 columnar biscuit to obtain columnar ceramic blocks;
processing the upper surface and the lower surface of the columnar ceramic block, and then circumferentially processing the columnar ceramic block to obtain a non-porous regular hexagonal prism heat storage block;
processing airflow through hole positioning holes on the end faces of the non-porous regular hexagonal prism heat storage blocks, and then processing airflow through holes from the airflow through hole positioning holes respectively;
Sequentially arranging heat storage blocks in a hearth of the alumina ceramic hollow brick heat storage heater along the circumferential direction by taking a central heat storage block as a center, wherein the missing blocks between the outermost heat storage block and the hearth are filled by edge blocks;
the heat storage blocks and the side blocks are arranged in a layered manner according to the arrangement mode until the hearth is fully arranged to form a heat storage body, and meanwhile, airflow through holes of the upper layer heat storage block and the lower layer heat storage block are correspondingly communicated;
The height of the central heat storage block of the top layer is half of the height of the heat storage blocks, and the heights of the heat storage blocks and the side blocks around the central heat storage block of the bottom layer are half of the heights of the heat storage blocks.
5. The method for preparing the heat accumulator for the alumina ceramic hollow brick heat accumulation heater according to claim 4, wherein the method comprises the following steps: the purity of the alpha-Al 2O3 is above 99%, and the particle size of the alpha-Al 2O3 micro powder is not more than 10nm.
6. The method for preparing the heat accumulator for the alumina ceramic hollow brick heat accumulation heater according to claim 4, wherein the method comprises the following steps: the columnar rubber model filled with the alpha-Al 2O3 micro powder is isostatically pressed into an alpha-Al 2O3 columnar biscuit, and the alpha-Al 2O3 columnar biscuit is pressed in a hydraulic isostatic press with a loading pressure of not less than 150 MPa.
7. The method for preparing the heat accumulator for the alumina ceramic hollow brick heat accumulation heater according to claim 4, wherein the method comprises the following steps: the columnar ceramic block obtained by sintering the alpha-Al 2O3 columnar biscuit is sintered in a high-temperature kiln, and the sintering temperature is not lower than 1700 ℃.
8. The method for preparing the heat accumulator for the alumina ceramic hollow brick heat accumulation heater according to claim 4, wherein the method comprises the following steps: the upper surface and the lower surface of the columnar ceramic block are processed by a diamond grinding machine, and the circumferential surface of the columnar ceramic block is processed by a cylindrical grinding machine.
9. The method for preparing the heat accumulator for the alumina ceramic hollow brick heat accumulation heater according to claim 4, wherein the method comprises the following steps: the positioning holes of the air flow holes are processed by an automatic grinding machine, and the air flow holes are processed by a manual drilling machine with a diamond drill bit.
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