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EP2623917B1 - Wärmeaustauschelement - Google Patents

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Publication number
EP2623917B1
EP2623917B1 EP11829311.7A EP11829311A EP2623917B1 EP 2623917 B1 EP2623917 B1 EP 2623917B1 EP 11829311 A EP11829311 A EP 11829311A EP 2623917 B1 EP2623917 B1 EP 2623917B1
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EP
European Patent Office
Prior art keywords
outer peripheral
peripheral wall
heat exchanger
partition walls
fluid
Prior art date
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Active
Application number
EP11829311.7A
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English (en)
French (fr)
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EP2623917A1 (de
EP2623917A4 (de
Inventor
Makoto Miyazaki
Yoshio Suzuki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NGK Insulators Ltd
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NGK Insulators Ltd
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Publication of EP2623917A1 publication Critical patent/EP2623917A1/de
Publication of EP2623917A4 publication Critical patent/EP2623917A4/de
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Publication of EP2623917B1 publication Critical patent/EP2623917B1/de
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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
    • 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
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/10—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically
    • F28D7/103—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically consisting of more than two coaxial conduits or modules of more than two coaxial conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/02—Tubular elements of cross-section which is non-circular
    • F28F1/04—Tubular elements of cross-section which is non-circular polygonal, e.g. rectangular
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F7/00—Elements not covered by group F28F1/00, F28F3/00 or F28F5/00
    • F28F7/02—Blocks traversed by passages for heat-exchange media

Definitions

  • the present invention relates to a heat exchanger element fixed to a heat exchanger for use.
  • a heat exchanger is sometimes used when a fluid (gas, liquid) is heated or cooled.
  • a heat exchanger a high-temperature fluid and a low temperature fluid is separated from each other by a passage wall having thermal conductivity, and heat is transferred to the passage wall, thereby conducting heat exchange between both the fluids.
  • the efficiency of heat exchange can be improved. Therefore, in order to widen the area of the passage wall, there has been devised a heat exchanger having a structure where a high-temperature fluid and a low temperature fluid are separated from each other by the corrugated passage wall.
  • a heat exchanger having a structure where each of the passage for a high-temperature fluid and the passage for a low-temperature fluid is divided into a plurality of passages and arranged so that the divided high-temperature passages and low-temperature passages are alternately disposed.
  • the present invention aims at providing a technique for inhibiting the breakage due to thermal stress while maintaining temperature efficiency and corrosion resistance.
  • the present invention is the heat exchanger element shown below.
  • a heat exchanger element of the present invention has a cylindrical outer peripheral wall made of ceramic containing SiC as the main component and partition walls which are made of ceramic containing SiC as the main component and separate and form a plurality of cells functioning as passages for the first fluid inside the outer peripheral wall.
  • a heat exchanger element of the present invention in the case of allowing the first fluid to flow through the portion inside the outer peripheral wall and the second fluid to flow though the portion outside the outer peripheral wall, the outer peripheral wall and the partition walls mediate heat exchange between the first fluid and the second fluid.
  • the first fluid is divided and sent into a plurality of cells.
  • the first fluid can flow while being brought into contact with the partition walls surrounding each cell.
  • heat exchange can be performed between the first fluid and the partition walls.
  • heat exchange can eventually be performed between the first fluid and the second fluid.
  • a heat exchanger element of the present invention since the first fluid is divided into a plurality of cells to promote the heat exchange between the first fluid and the partition walls in each cell, the temperature efficiency between the first fluid and the heat exchanger element is improved, and consequently temperature efficiency between the first fluid and the second fluid is improved.
  • the outer peripheral wall and partition walls are made of ceramic containing SiC as the main component, they have excellent corrosion resistance and high thermal conductivity. In such an outer peripheral wall and partition walls having high thermal conductivity, a temperature difference among portions is hardly caused. That is, in each of the outer peripheral wall and partition walls, the temperature difference between the portion having the highest temperature and the portion having the lowest temperature can be reduced. Therefore, in a heat exchanger element of the present invention, in the outer peripheral wall and the partition walls, generation of a large difference in contraction and expansion among portions can be inhibited.
  • the outer peripheral wall and the partition walls are made of ceramic containing SiC as the main component, generation of serious thermal stress in the outer peripheral wall and partition walls can be inhibited. As a result, in a heat exchanger element of the present invention, generation of a crack or breakage due to the thermal stress in the outer peripheral wall and the partition walls is inhibited.
  • the ceramic containing SiC as the main component in the present specification means ceramic containing 50 mass% or more of SiC.
  • partition walls made of ceramic containing SiC as the main component means partition walls containing 50 mass% or more of SiC.
  • the thickness T of the outer peripheral wall, the equivalent circle diameter D calculated from the area of the portion inside the outer peripheral wall in a cross section perpendicular to an axial direction of the outer peripheral wall, and thickness t of the partition walls satisfy the following formulae (1) to (3): 0.3 mm ⁇ T ⁇ 4.0 mm 15 mm ⁇ D ⁇ 120 mm 0.04 ⁇ T ⁇ t ⁇ 0.6 mm .
  • the rigidity of the outer peripheral wall is enhanced.
  • breakage of the outer peripheral wall is hardly caused in a heat exchanger element of the present invention. Consequently, a defect of mixing of the first fluid flowing through the portion inside the outer peripheral wall and the second fluid flowing through the portion outside the outer peripheral wall is hardly caused.
  • a heat exchanger element of the present invention since the aforementioned relations of the formulae (1) to (3) are satisfied, even if a crack or breakage is caused due to thermal stress in the partition walls, the crack or breakage can be inhibited from being extended to the degree of seriously lowering the temperature efficiency. Furthermore, when the aforementioned relations of the formulae (1) to (3) are satisfied, there can be inhibited a pressure drop caused when the first fluid flows through the portion inside the outer peripheral wall (specifically, inside the cells).
  • the thickness T of the outer peripheral wall, the equivalent circle diameter D calculated from the area of the portion inside the outer peripheral wall in a cross section perpendicular to an axial direction of the outer peripheral wall, and thickness t of the partition walls satisfy the following formulae (4) to (6): 0.5 mm ⁇ T ⁇ 4.0 mm 30 mm ⁇ D ⁇ 60 mm 0.04 ⁇ T ⁇ t ⁇ 0.6 mm
  • a heat exchanger element of the present invention when the aforementioned relations of the formulae (4) to (6) are satisfied, the rigidity of the outer peripheral wall is enhanced, and therefore a crack or breakage is hardly caused in the outer peripheral wall. In addition, also in the partition walls, a crack or breakage due to thermal stress is hardly caused. Further, in a heat exchanger element of the present invention, in the case that the outer peripheral wall has a cylindrical shape and that the relations of the aforementioned formulae (4) to (6) are satisfied, the effect of inhibiting generation of a crack or breakage in the outer peripheral wall and the effect of inhibiting generation of a crack or breakage in the partition walls can more securely be exhibited, which is preferable.
  • a cross sectional shape of the cells is a polygon constituted of obtuse angles.
  • the difference in the rigidity of the partition walls among portions inside the outer peripheral wall is small.
  • the difference in the magnitude of the thermal stress caused in the partition walls among portions inside the outer peripheral wall is small.
  • a heat exchanger element of the present invention it is preferable that at least one of the outer peripheral wall and partition walls is dense, and it is more preferable that both the outer peripheral wall and the partition walls are dense.
  • the outer peripheral wall is dense, the outer peripheral wall has high coefficient of thermal conductivity, and, as a result, the temperature efficiency of the heat exchanger element can be enhanced.
  • the partition walls are dense, the partition walls have high coefficient of thermal conductivity, and, as a result, the temperature efficiency of the heat exchanger element can be enhanced. Therefore, in a heat exchanger element of the present invention, in the case that both the outer peripheral wall and the partition walls are dense, it is possible to enhance the temperature efficiency more securely.
  • the term dense in the present specification means that the porosity is 10% or less.
  • the porosity is preferably 5% or less.
  • porosity used here means the porosity measured by the mercury porosimetry.
  • the coefficient of thermal conductivity is about 20 W/m ⁇ K.
  • the coefficient of thermal conductivity can be raised up to about 150 W/m ⁇ K.
  • a heat exchanger element of the present invention has a covering member for covering the outer peripheral wall.
  • the covering member is provided so as to separate the first fluid from the second fluid. This enables to inhibit mixture of the first fluid and the second fluid even if breakage is generated in the outer peripheral wall.
  • the covering member is provided so that heat exchange can be performed between the first fluid and the second fluid.
  • the first fluid can be separated from the second fluid by a simple structure of the inside and the outside of a cylinder. Since the heat exchanger element can have a simple structure of a cylindrical shape, the heat exchanger can be manufactured by a simple assembly operation. For example, tubes are connected to both the ends of a heat exchanger element of the present invention to form a passage for the first fluid, and then the heat exchanger element is covered with a casing to assemble a heat exchanger easily (A concrete example of assembly of a heat exchanger is described later).
  • Fig. 1 is a perspective view of one embodiment of a heat exchanger element of the present invention.
  • the heat exchanger element 1 of the present embodiment has a cylindrical outer peripheral wall 3.
  • the outer peripheral wall 3 is open at both the end portions 9a and 9b. Therefore, the first fluid can be passed through the portion inside the outer peripheral wall 3 while employing one of the end portions 9a and 9b as the inlet and the other as the outlet.
  • the portion inside the outer peripheral wall 3 is partitioned to have a square lattice shape by the partition walls 7.
  • the external shape of the honeycomb structure 20 is cylindrical (circular columnar) in the present embodiment, the external shape of the honeycomb structure 20 is not limited to the cylindrical shape.
  • an external cross-sectional shape of the honeycomb structure 20 may be an oval, a quadrangle, or other polygons when the honeycomb structure 20 is viewed from a cross section perpendicular to the axial direction.
  • the partition walls 7 passes straight through the inside of the outer peripheral wall 3, and both the ends of each partition wall 7 are brought into contact with the outer peripheral wall 3. Since the partition walls 7 are thus in contact with the outer peripheral wall 3, heat transfer becomes possible between the partition walls 7 and the outer peripheral wall 3.
  • the outer peripheral wall 3 and the partition walls 7 are formed of ceramic containing SiC as the main component.
  • the outer peripheral wall 3 and the partition walls 7 can be formed of ceramic containing SiC impregnated with metal Si as the main component.
  • the more the amount of metal Si is increased the more the coefficient of thermal conductivity of the outer peripheral wall 3 and the partition walls 7 can be raised.
  • ceramic containing SiC impregnated with metal Si as the main component by impregnating 100 parts by mass of ceramic containing SiC before the metal Si impregnation as the main component with 30 parts by mass or more of metal Si, the coefficient of thermal conductivity can be made 100 W/m ⁇ K or more.
  • the material for the outer peripheral wall 3 and the partition walls 7 there can be employed Si-impregnated SiC, (Si+Al)-impregnated SiC, metal composite SiC, recrystallized SiC, Si 3 N 4 , SiC, and the like.
  • the outer peripheral wall 3 and the partition walls 7 made of a material listed above are porous (a porosity of 30% or more), it may be impossible to obtain a high coefficient of thermal conductivity.
  • Si-impregnated SiC or (Si+Al)-impregnated SiC as the material for the outer peripheral wall 3 and the partition walls 7.
  • the outer peripheral wall 3 and the partition walls 7 employing Si-impregnated SiC is densely formed with a high coefficient of thermal conductivity and thermal resistance to show sufficient strength.
  • the coefficient of thermal conductivity is about 20 W/m ⁇ K in the case of porous (a porosity of 30% or more) SiC (silicon carbide)
  • the coefficient of thermal conductivity in the case of dense (a porosity of 10% or less) Si-impregnated SiC is improved to about 150 W/m ⁇ K.
  • the outer peripheral walls 3 and the partition walls 7 can be excellent in thermal resistance, thermal shock resistance, oxidation resistance, corrosion resistance to acid and alkali, and, as a result, the heat exchanger element 1 can be made to be durable against long-period use.
  • the ratio of Si content to the sum of Si content and SiC content is preferably 0.05 to 0.5, more preferably 0.1 to 0.4.
  • the ratio of Si content to the sum of Si content and SiC content is 0.05 or more, the bonding of SiC particles to each other by means of a Si phase becomes sufficient, thereby increasing the strength of the outer peripheral wall 3 and the partition walls 7.
  • a sufficient coefficient of thermal conductivity can be obtained.
  • the ratio of Si content to the sum of Si content and SiC content is 0.5 or less, the amount of the Si phase does not become too excessive, and, as a result, upon forming the outer peripheral wall 3 and the partition walls 7 through firing and the like, an unfavorable phenomenon such as deformation is hardly caused.
  • Fig. 2 is a front view of an end portion 9a of the heat exchanger element 1 of the present embodiment.
  • This front view shows the thickness T of the outer peripheral wall 3, the equivalent circle diameter D calculated from the area of the portion inside the outer peripheral wall 3 in a cross section perpendicular to an axial direction of the outer peripheral wall 3, and thickness t of the partition walls 7 in the heat exchanger element 1 of the present embodiment.
  • the outer peripheral wall 3 has a cylindrical shape having a uniform thickness.
  • the cross section inside the outer peripheral wall 3 is circle. Therefore, the size of the aforementioned equivalent circle diameter D is the same as the size of the internal diameter of the outer peripheral wall 3.
  • the shape of the outer peripheral wall is other than the cylindrical shape
  • the area of the region surrounded by the surface inside the outer peripheral wall in a cross section perpendicular to the axial direction of the outer peripheral wall is obtained, and the diameter of the circle having the same area as the aforementioned area is calculated to determine the diameter as the equivalent circle diameter D.
  • Fig. 3 shows a schematic view of a heat exchanger 21 having the heat exchanger element 1 shown in Fig. 1 .
  • the aforementioned heat exchanger element 1 is arranged in a casing 11.
  • the casing 11 used here is formed to have a rectangular parallelepiped box shape by walls 19.
  • a hole is made in each of a wall 19 of one face of the casing 11 and a wall 19 of the opposite side, and the end portion 9a and the end portion 9b of the heat exchanger element 1 are engaged with these holes. This allows the heat exchanger element 1 to pass through the inside of the casing 11.
  • the end portion 9a and the end portion 9b of the heat exchanger element 1 are connected to the tube 23a and tube 23b, respectively, outside the walls 19.
  • the heat exchanger 21 of the present embodiment by sending the first fluid into the tube 23a, it can successively be sent to the inside of the heat exchanger element 1 and further to the tube 23b.
  • Fig. 4 is a cross sectional view along A-A' of Fig. 3 . As shown in the figure, when the first fluid flows inside the heat exchanger element 1 (inside the outer peripheral wall 3), the first fluid is divided into a plurality of cells 5.
  • the casing 11 is provided with the inlet 13 for allowing the second fluid to flow into the casing 11 and the outlet 15 for discharging the second fluid outside from the casing 11.
  • Fig. 5 is a cross sectional view along B-B' of Fig. 3 .
  • the second fluid flows into the casing 11 from the inlet 13, it flows with coming into contact with the outer peripheral face 4 of the outer peripheral wall 3 of the heat exchanger element 1 and is finally discharged from the outlet 15.
  • any shape can be employed as well as the first fluid can be passed the heat exchanger element or the first fluid passage formed by connecting tubes to the heat exchanger element through the inside of the casing and the second fluid can be passed along the outer periphery of the heat exchanger element inside the casing.
  • the heat transfer is caused from the first fluid to the second fluid.
  • the heat transfer from the first fluid to the outer peripheral wall 3 is performed by the two modes described below.
  • the heat can directly be transferred to the outer peripheral wall 3.
  • the first fluid flowing through the other cells can transfer heat to the outer peripheral wall 3 by means of the partition walls 7.
  • heat is transferred from the first fluid to the partition walls 7 forming the cells 5a in the first place, and then heat sequentially passes from the partition walls 7 of the cells 5a to the partition walls 7 forming the other cells 5 so that the heat can be transferred to the outer peripheral wall 3.
  • heat can be transferred securely to the outer peripheral wall 3 by using heat conduction of the partition walls 7.
  • the heat exchanger element 1 of the present embodiment for example, in the case that a hole or a crack is caused in the partition wall 7 shown by the frame ⁇ of the broken like in Fig. 5 (partition wall 7 separating the cell 5b from cell 5c), only the first fluid flowing through the cell 5b and that flowing through the cell 5c are mixed together. Therefore, it does not develop into a fatal malfunction of impairing the function as a heat exchanger element. Therefore, in the heat exchanger element 1 of the present embodiment, it is easy to suitably apply formation enabling to realize a higher temperature efficiency, such as thinning the partition walls 7 or forming partition walls 7 having a twisted shape as modified examples.
  • the partition walls 7 play a role of structurally reinforcing the outer peripheral wall 3 as a beam. Since the partition walls 7 thus play a role as a beam, the outer peripheral wall 3 hardly has a hole or a crack. Therefore, in the heat exchanger element 1 of the present embodiment, a fatal malfunction of allowing the first fluid and the second fluid to be mixed together is hardly caused.
  • Fig. 6 is a perspective view of a modified example of the present embodiment.
  • the heat exchanger element 100 of the present modified example has a cylindrical metal tube 40 and a graphite sheet 45.
  • a part of the metal tube 40 is cut off so that the graphite sheet 45 present inside the metal tube 40 is exposed, and furthermore a part of the exposed graphite sheet 45 is cut off so that the outer peripheral wall 3 present inside the graphite sheet 45 is exposed.
  • the honeycomb structure 20 is housed inside the metal tube 40 in the state that the outer peripheral wall 3 is covered with the graphite sheet 45.
  • the leaked first fluid can be shielded by the tubular wall of the metal tube 40 to inhibit the mixture of the first fluid and the second fluid.
  • the graphite sheet 45 When the graphite sheet 45 is put between the outer peripheral wall 3 and the metal tube 40, since the graphite sheet 45 is flexible, it becomes possible that the graphite sheet 45 is allowed to enter the depressions of the surface of the outer peripheral wall 3 for contact. Thus, the outer peripheral wall 3 and the metal tube 40 can be brought into contact with the graphite sheet 45 in a wide range, and, as a result, good thermal conduction can be performed through the outer peripheral wall 3, the graphite sheet 45, and metal tube 40.
  • Fig. 7 is a perspective view of another modified example of the present embodiment.
  • the heat exchanger element 150 of the present modified example has a quadrangular prism-shaped outer peripheral wall 3 having a hollow in the portion inside it.
  • the portion inside the outer peripheral wall 3 is partitioned into a square lattice shape by the partition walls 7 to form a plurality of cells 5 in the portion inside the outer peripheral wall 3.
  • the cross-sectional shape of the portion inside the outer peripheral wall 3 is a square having a side length of L (mm). Therefore, in this modified example, the equivalent circle diameter D calculated from the area of the portion inside the outer peripheral wall 3 in a cross section perpendicular to the axial direction of the outer peripheral wall 3 is 2L/ ⁇ 1/2 (mm) .
  • Fig. 8 is an enlarged view of one end portion of a heat exchanger element of an embodiment of the present invention.
  • the cross-sectional shape of the cells 5 is a regular hexagon (polygon having an interior angle of 120 degree in the cross-sectional shape of a cell) . Since the cross-sectional shape of the cell is a polygon having obtuse interior angles, thermal stress caused in the partition walls 7 is relaxed. As a result, generation of a crack or breakage in the partition walls 7 can be inhibited.
  • Fig. 9 is an enlarged view of one end portion of a heat exchanger element of one embodiment of the present invention.
  • the heat exchanger element 220 of the present embodiment there is a notch 31 in a part of the partition walls 7. Since a partition wall 7 has a notch 31, the thermal stress caused in the partition wall 7 can be relaxed, and, as a result, generation of a crack or breakage in the partition walls 7 can be inhibited.
  • thermal stress generated in the partition walls 7 can be relaxed more effectively. As a result, generation of a crack or breakage in the partition walls 7 can be inhibited furthermore securely.
  • Fig. 10 is a cross section of a heat exchanger element of an embodiment of the present invention.
  • the outer peripheral wall 3 has a notch 33.
  • thermal stress caused in the outer peripheral wall 3 can be relaxed, and, as a result, generation of a crack and breakage in the outer peripheral wall 3 can be inhibited.
  • forming a notch 33 in a position where a plurality of partition walls 7 intersect each other in the outer peripheral wall 3 is preferable because also the thermal stress caused in the plurality of partition walls 7 can be relaxed.
  • Fig. 11 is a cross-sectional view of a heat exchanger element of one embodiment of the present invention.
  • the partition walls 7 in the central portion inside the outer peripheral wall 3 are thin, and the partition walls 7 in the outer peripheral portion are thick.
  • the thermal stress generated in the partition walls 7 in the central portion can be reduced.
  • generation of a crack or breakage in the partition walls 7 in the central portion can be inhibited.
  • the partition walls 7 in the outer peripheral portion are thicker than those in the central portion, they are at risk of generating large thermal stress.
  • the partition walls 7 in the outer peripheral portion are closer to the joint portion of the partition walls 7 and the outer peripheral wall 3, strength is increased by the outer peripheral wall 3. Therefore, even in the partition walls 7 in the outer peripheral portion, generation of a crack and breakage is inhibited.
  • a SiC powder having an average particle diameter of 45 ⁇ m 70 mass% of a SiC powder having an average particle diameter of 45 ⁇ m, 10 mass% of SiC powder having an average particle diameter of 35 ⁇ m, and 20 mass% of a SiC powder having an average particle diameter of 5 ⁇ m were mixed together to prepare a mixture of SiC powders.
  • To 100 parts by mass of the mixture of SiC powders were added 4 parts by mass of a binder, and water, and they were kneaded by the use of a kneader to obtain a kneaded material. This kneaded material was put into a vacuum kneader to manufacture kneaded clay formed in a circular columnar shape.
  • the kneaded clay was extruded to form a honeycomb formed body.
  • the shape and thickness of the outer peripheral wall, thickness of the partition walls, cell shape, cell density, and the like were made to be desirable.
  • the die employed was made of superhard alloy which hardly abrade away.
  • the outer peripheral wall was made to have a cylindrical shape or a hollow quadrangular prism shape, and the portion inside the outer peripheral wall was formed to have a structure partitioned in a square lattice shape by partition walls.
  • partition walls were formed in parallel with one another at regular intervals in each of the directions perpendicular to each other so as to pass straight through the portion inside the outer peripheral wall. This made the square cross-sectional shape of the cells in portions except for the outermost peripheral portion inside the outer peripheral wall.
  • the honeycomb formed body obtained by the extrusion was dried.
  • the honeycomb formed body was dried in a microwave heating method and then dried in an external heating method.
  • moisture corresponding to 97% or more of the entire moisture contained in the honeycomb formed body before drying was removed from the honeycomb formed body.
  • the honeycomb formed body was subjected to degreasing at 500°C for five hours in a nitrogen atmosphere. Further, a block of metal Si was put on the honeycomb structure obtained by such degreasing, and they were fired at 1450°C for four hours in an inert gas in a vacuum or under reduced pressure. During the firing, the metal Si block put on the honeycomb structure was melted to impregnate the outer peripheral wall and the partition walls with metal Si. In the case of making the coefficient of thermal conductivity of the outer peripheral wall and the partition walls 100 W/m ⁇ K, there was used 70 parts by mass of a metal Si block with respect to 100 parts by mass of the honeycomb structure.
  • heat exchanger elements each having a cylindrical outer peripheral wall and having basically the same structure as that shown in Fig. 1 .
  • heat exchanger elements each having an entire length of 100 mm, an outer peripheral wall thickness T of 1.0 mm, a partition wall thickness t of 0.5 mm, a cell density of 24 cells/cm 2 , a thermal conductivity coefficient of 150 W/m ⁇ K of the outer peripheral wall and the partition walls, and an equivalent circle diameter D (same as the inner diameter of the outer peripheral wall here) calculated from the area of the portion inside the outer peripheral wall as shown in Table 1.
  • heat exchanger elements each having a cylindrical outer peripheral wall and having basically the same structure as that shown in Fig. 1 .
  • heat exchanger elements each having an entire length of 100 mm, an equivalent circle diameter D (same as the inner diameter of the outer peripheral wall here) of 45 mm calculated from the area of the portion inside the outer peripheral wall, a cell density of 24 cells/cm 2 , a thermal conductivity coefficient of 150 W/m ⁇ K of the outer peripheral wall and the partition walls, and an outer peripheral wall thickness T and a partition wall thickness t as shown in Table 2.
  • heat exchanger elements each having a cylindrical outer peripheral wall and having basically the same structure as that shown in Fig. 1 .
  • heat exchanger elements each having an entire length of 100 mm, an equivalent circle diameter D (same as the inner diameter of the outer peripheral wall here) of 45 mm calculated from the area of the portion inside the outer peripheral wall, a cell density of 24 cells/cm 2 , a thermal conductivity coefficient of 100 W/m ⁇ K of the outer peripheral wall and the partition walls, and an outer peripheral wall thickness T and a partition wall thickness t as shown in Table 3.
  • heat exchanger elements each having a quadrangular prism-shaped outer peripheral wall and having basically the same structure as that shown in Fig. 7 .
  • heat exchanger elements each having an entire length of 100 mm, an outer peripheral wall thickness T of 1.0 mm, a partition wall thickness t of 0.5 mm, a cell density of 24 cells/cm 2 , a thermal conductivity coefficient of 150 W/m ⁇ K of the outer peripheral wall and the partition walls, and an equivalent circle diameter D calculated from the area of the portion inside the outer peripheral wall as shown in Table 4.
  • the cross section of the portion inside the outer peripheral wall in the case of viewing the thermal exchanging member from a cross section perpendicular to the axial direction was square, and the length of a side was as shown in Table 4.
  • each of the aforementioned heat exchanger elements of Examples and Comparative Examples was put in a casing to manufacture heat exchangers (heat exchangers having basically the same structure as shown in Fig. 3 ).
  • Each of the heat exchanger elements having a quadrangular prism-like outer peripheral wall was put in a rectangular parallelepiped box type casing (Examples 37 to 44, Comparative Examples 18 and 19).
  • 10 heat exchangers were manufactured, and the 10 heat exchangers were subjected to the following heat exchange test and the like.
  • nitrogen gas was used as the first fluid, and water was used as the second fluid to perform the heat exchange test.
  • the temperature of the nitrogen gas was 500°C
  • the flow rate was 20 g/s
  • the flow rate of water was 5 L/min.
  • the heat exchange test was carried out after it was confirmed that the temperature of nitrogen gas at the outlet (temperature of nitrogen gas right after being discharged from the outlet side of the heat exchanger element) and the temperature of water at the outlet (temperature of water when the water was passing through the outlet of the casing) were stabilized.
  • An urethane rubber sheet having a thickness of 0.5 mm was wrapped around the outer peripheral wall of the heat exchanger element. Further, an aluminum plate having a thickness of 20 mm was disposed on both the end portions of the heat exchanger element with a circular urethane rubber sheet put therebetween. The aluminum plate and the urethane rubber sheet had the same shape and the same size as those of the end portion of the heat exchanger element (e.g., in the case that the outer peripheral wall has a cylindrical shape, i.e., that the end portion has a circular shape, an aluminum circular plate was used). Further, a vinyl tape was wound around the outer periphery of the aluminum plate to seal the gap between the outer periphery of the aluminum plate and the urethane rubber sheet.
  • a test sample was obtained.
  • the test sample was put in a pressure container filled with water.
  • pressure of the water in the pressure container was raised to 20 MPa at a rate of 0.3 to 3.0 MPa/min., and the hydraulic pressure was measured when breakage was caused in the heat exchanger element.
  • the hydraulic pressure at the time of generating breakage in the heat exchanger element is shown in Tables 1 to 4. Incidentally, when no breakage was caused even under a hydraulic pressure of 20 MPa, it was indicated as ">20" in Tables 1 to 4.
  • the present invention can be used as a heat exchanger element fixed to a heat exchanger for use.
  • heat exchanger element 3: outer peripheral wall, 4: outer peripheral face, 5, 5a to 5c: cell, 7: partition wall, 9, 9a, 9b: end portion, 11: casing, 13: inlet (of the second fluid), 15: outlet (of the second fluid), 17: passage (of the second fluid), 19: wall, 20: honeycomb structure, 21: heat exchanger, 23a, 23b: tube, 31: notch (in partition wall), 33: notch (in outer peripheral wall), 40: metal tube, 45: graphite sheet, 100, 150, 210, 220, 230, 240: heat exchanger element

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  • Ceramic Engineering (AREA)
  • Geometry (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Claims (5)

  1. Wärmeaustauschelement (1), umfassend:
    eine zylinderförmige Außenumfangswand (3), die aus einer SiC als eine Hauptkomponente enthaltenden Keramik hergestellt ist, und
    Trennwände (7), die aus einer SiC als eine Hauptkomponente enthaltenden Keramik hergestellt sind, und eine Vielzahl von Zellen (5) trennen und bilden, die als Durchlässe für ein erstes Fluid in einem Abschnitt im Inneren der Außenumfangswand (3) fungieren;
    wobei die Außenumfangswand (3) und die Trennwände (7) einen Wärmeaustausch zwischen dem ersten Fluid, das durch den Abschnitt im Inneren der Außenumfangswand (3) hindurchströmt, und dem zweiten Fluid, das durch den Abschnitt außerhalb der Außenumfangswand (3) hindurchströmt, vermitteln,
    dadurch gekennzeichnet,
    dass die Dicke (T) der Außenumfangswand (3), der äquivalente Kreisdurchmesser (D), der aus der Fläche des Abschnitts im Inneren der Außenumfangswand (3) in einem zu einer axialen Richtung der Außenumfangswand (3) senkrechten Querschnitt berechnet wird, und eine Dicke (t) der Trennwände (7) die folgende Formeln (1) bis (3) erfüllen: 0,3 mm ≤ T ≤ 4,0 mm
    Figure imgb0020
     15 mm ≤ D ≤ 120 mm
    Figure imgb0021
     0,04 × T ≤ t ≤ 0,6 mm
    Figure imgb0022
  2. Wärmeaustauschelement gemäß Anspruch 1, wobei die Dicke T der Außenumfangswand (3), der äquivalente Kreisdurchmesser (D), der aus der Fläche des Abschnitts im Inneren der Außenumfangswand (3) in einem zu einer axialen Richtung der Außenumfangswand (3) senkrechten Querschnitt berechnet wird, und eine Dicke (t) der Trennwände (7) die folgenden Formeln (4) bis (6) erfüllen: 0,5 mm ≤ T ≤ 4,0 mm
    Figure imgb0023
     30 mm ≤ D ≤ 60 mm
    Figure imgb0024
     0,04 × T ≤ t ≤ 0,6 mm
    Figure imgb0025
  3. Wärmeaustauschelement gemäß Anspruch 1 oder 2, wobei eine Querschnittsform der Zellen (5) ein aus stumpfen Winkeln gebildetes Polygon ist.
  4. Wärmeaustauschelement gemäß einem der Ansprüche 1 bis 3, wobei mindestens eine der Außenumfangswand (3) und der Trennwände (7) kompakt ist.
  5. Wärmeaustauschelement gemäß einem der Ansprüche 1 bis 4, das ein Abdeckelement aufweist, das für ein Trennen des ersten Fluids vom zweiten Fluid und zum Abdecken der Außenumfangswand (3) vorgesehen ist, um so einen Wärmeaustausch zwischen dem ersten Fluid und dem zweiten Fluid zu ermöglichen.
EP11829311.7A 2010-09-29 2011-09-29 Wärmeaustauschelement Active EP2623917B1 (de)

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EP2623917A4 (de) 2017-05-17
WO2012043758A1 (ja) 2012-04-05

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