Heat exchanger

Abstract

The invention provides a heat exchanger capable of suppressing mixing of a first fluid and a second fluid. This heat exchanger is provided with a first honeycomb structure (10), a first cylindrical member (20), and a second honeycomb structure (30). The first honeycomb structure (10) has an outer peripheral wall (11) and partition walls (13) that are disposed on the inner side of the outer peripheral wall (11) and that define a plurality of cells (12) that serve as flow paths for a first fluid. The first cylindrical member (20) is fitted to the outer peripheral wall (11) of the first honeycomb structure (10). The second honeycomb structure (30) has an outer peripheral wall (31), an inner peripheral wall (35), and partition walls (33) disposed between the outer peripheral wall (31) and the inner peripheral wall (35) and defining a plurality of cells (32) forming flow paths for the second fluid, and the inner peripheral wall (35) is fitted to the first cylindrical member (20).

Description

Technical Field

[0001] The present invention relates to heat exchangers. Background Art

[0002] Heat exchangers that utilize exhaust gas and other heat sources to preheat fuel air and steam are being incorporated into various systems. For example, there are heat exchangers that use exhaust gas from boilers used in thermal power plants as a heat source to preheat combustion air, and heat exchangers that use exhaust gas from fuel cells as a heat source to generate and preheat steam. Systems incorporating such heat exchangers are known to reduce energy usage by reusing the energy of exhaust gas and other waste heat.

[0003] As a heat exchanger used in the above-mentioned technology, a heat exchanger is proposed in patent document 1, which comprises: a heat collecting part, which is formed into a honeycomb structure, and the honeycomb structure has a plurality of compartments that pass through from one end to the other end to form a flow path of a first fluid and partition walls composed mainly of ceramics that divide the plurality of compartments; a heat transfer part, which has an outer peripheral wall composed mainly of ceramics that is arranged on the periphery of the heat collecting part, and the first fluid is separated from the second fluid flowing on the outer peripheral side of the heat collecting part by the outer peripheral wall, while intervening in the heat transfer between the first fluid and the second fluid; and an intermediate wall, which surrounds the compartment located in the center part of the plurality of compartments and divides the compartment into the compartment located in the center part and the compartment located in the remaining peripheral part, and is mainly composed of ceramics that is thicker than the partition wall.

[0004] In addition, as a heat exchanger that is particularly suitable for heat exchange between gases, a heat exchanger is proposed in patent document 2, which comprises: a three-dimensional mesh structure portion having partition walls and / or connecting air holes that divide the first flow path, i.e., the first fluid flow portion, into 2×2 or more rows of compartments; a partition wall and / or the three-dimensional mesh structure portion that divide the flow path, i.e., the second fluid flow portion, into a plurality of compartments separated by an intermediate wall on its periphery; and an inlet portion that further has an outer peripheral wall on its periphery and is used to allow the second fluid to flow from the outside into the second fluid flow portion, and a discharge portion that discharges the second fluid flowing into the second fluid flow portion to the outside, and at least one pair of ceramic structures with ceramic as the main component are provided on a portion of the outer peripheral wall.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Laid-Open No. 2012-189229

[0008] Patent Document 2: Japanese Patent Application Laid-Open No. 2015-042934 Summary of the Invention

[0009] Problems to be solved by the invention

[0010] In both the heat exchangers of Patent Documents 1 and 2, a flow path of a first fluid and a flow path of a second fluid are separated by an intermediate wall.

[0011] However, since the intermediate wall is made of a material containing ceramic as a main component, there is a concern that the fluids may flow into other flow paths through the pores in the intermediate wall, causing the fluids to mix with each other.

[0012] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a heat exchanger capable of suppressing mixing of a first fluid and a second fluid.

[0013] Solutions to Problems

[0014] The present inventors have discovered that the above-mentioned problems can be solved by disposing a cylindrical member between two types of honeycomb structures, and have thus completed the present invention.

[0015] [1] A heat exchanger comprising:

[0016] a first honeycomb structure having an outer peripheral wall and partition walls provided inside the outer peripheral wall and defining a plurality of cells serving as flow paths for a first fluid;

[0017] a first tubular member fitted into the outer peripheral wall of the first honeycomb structure; and

[0018] The second honeycomb structure includes an outer peripheral wall, an inner peripheral wall, and partition walls disposed between the outer peripheral wall and the inner peripheral wall to define a plurality of cells serving as flow paths for a second fluid, wherein the inner peripheral wall is fitted to the first tubular member.

[0019] [2] The heat exchanger according to [1], further comprising a heat conducting member disposed between the first honeycomb structure and the first tubular member and / or between the second honeycomb structure and the first tubular member.

[0020] [3] The heat exchanger according to [1] or [2], wherein in the axial direction of the first honeycomb structure and the second honeycomb structure, both end surfaces of the second honeycomb structure are located inside of both end surfaces of the first honeycomb structure.

[0021] [4] The heat exchanger according to any one of [1] to [3], wherein, in the axial direction of the first honeycomb structure and the second honeycomb structure, both end portions of the first tubular member are located outside both end surfaces of the first honeycomb structure and the second honeycomb structure.

[0022] [5] The heat exchanger according to any one of [1] to [4], wherein in a cross section of the first honeycomb structure and the second honeycomb structure perpendicular to the direction in which the cells extend, the partition walls have a first partition wall extending in a circumferential direction and a second partition wall extending in a radial direction.

[0023] [6] The heat exchanger according to any one of [1] to [5], wherein the second honeycomb structure is divided into a plurality of parts in a cross section of the second honeycomb structure perpendicular to a direction in which the cells extend.

[0024] [7] The heat exchanger according to any one of [1] to [6], wherein the first honeycomb structure and / or the second honeycomb structure contains ceramic as a main component.

[0025] [8] The heat exchanger according to [7], wherein the ceramic contains silicon carbide as a main component.

[0026] [9] The heat exchanger according to any one of [1] to [8], wherein the first tubular member is made of a metal material.

[0027]

[10] The heat exchanger according to any one of [1] to [9], wherein at least one end portion of the first tubular member is reduced in diameter or expanded in diameter.

[0028]

[11] The heat exchanger according to any one of [1] to

[10] , further comprising a second tubular member that is engaged with at least a portion of the outer peripheral wall of the second honeycomb structure, the second tubular member having an inlet and an outlet for the second fluid.

[0029]

[12] The heat exchanger according to

[11] , further comprising a heat insulating material disposed between the second honeycomb structure and the second tubular member.

[0030]

[13] The heat exchanger according to any one of [1] to

[12] , wherein the flow direction of the first fluid is opposite to the flow direction of the second fluid.

[0031]

[14] The heat exchanger according to any one of [1] to

[13] , wherein the first honeycomb structure further includes an inner peripheral wall, and the inner peripheral wall forms a hollow region serving as a flow path for the third fluid.

[0032]

[15] The heat exchanger according to

[14] further comprises a third tubular member that is fitted into at least a portion of the inner peripheral wall of the first honeycomb structure, and the third tubular member has an inlet and an outlet for the third fluid.

[0033] According to the present invention, a heat exchanger capable of suppressing mixing of a first fluid and a second fluid can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1A This is a cross-sectional view of the heat exchanger according to Embodiment 1 of the present invention, taken along a direction parallel to the direction in which the cells extend.

[0035] Figure 1B yes Figure 1A Cross-sectional view of the heat exchanger at line a-a'.

[0036] Figure 2A This is a cross-sectional view of another heat exchanger according to Embodiment 1 of the present invention, taken along a direction perpendicular to the direction in which the cells extend.

[0037] Figure 2B This is a cross-sectional view of another heat exchanger according to Embodiment 1 of the present invention, taken along a direction perpendicular to the direction in which the cells extend.

[0038] Figure 3A This is a cross-sectional view of another heat exchanger according to Embodiment 1 of the present invention, taken along a direction parallel to the direction in which the cells extend.

[0039] Figure 3B This is a cross-sectional view of another heat exchanger according to Embodiment 1 of the present invention, taken along a direction parallel to the direction in which the cells extend.

[0040] Figure 4A This is a cross-sectional view of the heat exchanger according to Embodiment 2 of the present invention, taken along a direction parallel to the direction in which the cells extend.

[0041] Figure 4B yes Figure 4A Cross-sectional view of the heat exchanger at line bb'.

[0042] Figure 5 This is a cross-sectional view of a heat exchanger according to Embodiment 3 of the present invention, taken along a direction parallel to the direction in which cells extend.

[0043] Figure 6 This is a cross-sectional view of another heat exchanger according to Embodiment 3 of the present invention, taken along a direction parallel to the direction in which the cells extend.

[0044] Figure 7A This is a cross-sectional view of the heat exchanger according to Embodiment 4 of the present invention, taken along a direction parallel to the direction in which the cells extend.

[0045] Figure 7B yes Figure 7A Cross-sectional view of the heat exchanger at line c-c'.

[0046] Figure 8A This is a cross-sectional view of another heat exchanger according to Embodiment 4 of the present invention, taken along a direction parallel to the direction in which the cells extend.

[0047] Figure 8B yes Figure 8A Cross-sectional view of the heat exchanger at line d-d'. DETAILED DESCRIPTION

[0048] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the present invention is not limited to the following embodiments, and that embodiments obtained by appropriately modifying or improving the following embodiments based on the common sense of those skilled in the art without departing from the gist of the present invention also fall within the scope of the present invention.

[0049] <Implementation Method 1>

[0050] Figure 1A : is a cross-sectional view of the heat exchanger according to the first embodiment of the present invention, parallel to the direction in which the compartments extend. Figure 1B yes Figure 1A Cross-sectional view of the heat exchanger at line a-a' ( Figure 1A (a cross-sectional view of the heat exchanger perpendicular to the direction in which the compartments extend).

[0051] like Figure 1A and Figure 1B As shown, the heat exchanger of embodiment 1 of the present invention includes a first honeycomb structure 10, a first tubular member 20, and a second honeycomb structure 30. The first honeycomb structure 10 has an outer peripheral wall 11 and a partition wall 13, which is arranged on the inner side of the outer peripheral wall 11 and divides a plurality of cells 12 that form a flow path for the first fluid. The first tubular member 20 is fitted into the outer peripheral wall 11 of the first honeycomb structure 10. The second honeycomb structure 30 has an outer peripheral wall 31, an inner peripheral wall 35, and a partition wall 33 that is arranged between the outer peripheral wall 31 and the inner peripheral wall 35 and divides a plurality of cells 32 that form a flow path for the second fluid. In addition, the inner peripheral wall 35 of the second honeycomb structure 30 is fitted into the first tubular member 20. The heat exchanger having such a structure has the first tubular member 20 arranged between the first honeycomb structure 10 through which the first fluid flows and the second honeycomb structure 30 through which the second fluid flows, thereby being able to suppress mixing of the first fluid and the second fluid.

[0052] It should be noted that, in this specification, "heat exchanger" refers to a device or component for exchanging heat energy between two different fluids (e.g., a first fluid and a second fluid). When a heat exchanger refers to a device, it may further include known components required to constitute the device.

[0053] (First Honeycomb Structure 10)

[0054] The first honeycomb structure 10 includes an outer peripheral wall 11 and partition walls 13 provided inside the outer peripheral wall 11 to define a plurality of cells 12 serving as flow paths for the first fluid. The flow paths for the first fluid extend from one end face 14a to the other end face 14b.

[0055] The shape of the first honeycomb structure 10 is not particularly limited. In a cross section perpendicular to the direction in which the cells 12 extend, Figure 1B In addition to the circle shown, an ellipse, a quadrilateral, or other polygons may also be used.

[0056] The shape of the compartment 12 is not particularly limited. In a cross section perpendicular to the direction in which the compartment 12 extends, except for Figure 1B In addition to the quadrilateral shown, a circle, an ellipse, a triangle, a hexagon or other polygons may also be used.

[0057] In the cross section of the first honeycomb structure 10 perpendicular to the direction in which the cells 12 extend, the partition walls 13 are as follows: Figure 1B As shown, it is preferred to have a first partition wall 13a extending in the circumferential direction and a second partition wall 13b extending in the radial direction. By setting such a structure, the first fluid flowing in the cell 12 of the first honeycomb structure 10 and the second fluid flowing in the cell 32 of the second honeycomb structure 30 can be efficiently exchanged.

[0058] The thickness of the partition walls 13 is not particularly limited, but is preferably 0.05 to 1.0 mm, more preferably 0.2 to 0.6 mm. By setting the thickness of the partition walls 13 to 0.05 mm or greater, the mechanical strength of the first honeycomb structure 10 can be sufficiently enhanced. Furthermore, by setting the thickness of the partition walls 13 to 1.0 mm or less, problems such as increased pressure loss due to a reduced opening area and decreased heat recovery efficiency due to a reduced contact area with the first fluid can be suppressed.

[0059] The thickness of the outer peripheral wall 11 is not particularly limited, but is preferably greater than the thickness of the partition wall 13. By setting such a structure, the strength of the outer peripheral wall 11, which is easily damaged (for example, cracked or broken) by external impact, thermal stress caused by the temperature difference between the first fluid and the second fluid, etc., can be improved.

[0060] The thickness of the outer peripheral wall 11 is not particularly limited and can be appropriately adjusted according to the application, etc. For example, the thickness of the outer peripheral wall 11 is preferably 0.1 mm to 10 mm, more preferably 0.5 mm to 5 mm, and even more preferably 1 mm to 3 mm.

[0061] The first honeycomb structure 10 (outer peripheral wall 11 and partition walls 13) is primarily composed of ceramic. "Mainly composed of ceramic" means that the mass of ceramic accounts for at least 50% by mass of the total mass of the components. The use of ceramics can reduce rust and deformation while also achieving weight reduction.

[0062] The ceramic is not particularly limited, but preferably contains silicon carbide (SiC) as its main component. Examples of ceramics containing silicon carbide (SiC) as its main component include Si-impregnated SiC, (Si+Al)-impregnated SiC, metal-composite SiC, recrystallized SiC, Si3N4, and SiC. Among these, Si-impregnated SiC and (Si+Al)-impregnated SiC are preferably used from the perspectives of low-cost production and high thermal conductivity.

[0063] The porosity of the peripheral wall 11 and the partition walls 13 is not particularly limited, but is preferably 10% or less, more preferably 5% or less, and even more preferably 3% or less. Setting the porosity of the peripheral wall 11 and the partition walls 13 to 10% or less improves thermal conductivity.

[0064] Here, the "porosity" in this specification refers to the porosity measured by the mercury intrusion method in accordance with JIS R1655:2003 (Japanese Industrial Standards).

[0065] The cell density of the first honeycomb structure 10 in a cross section perpendicular to the direction in which the cells 12 extend (i.e., the number of cells 12 per unit area) is not particularly limited, but is preferably 4 to 320 cells / cm 2 By setting the cell density to 4 cells / cm 2 As described above, the strength of the partition walls 13 can be sufficiently ensured, and further the strength and effective GSA (geometric surface area) of the first honeycomb structure 10 itself can be sufficiently ensured. 2 As a result, it is possible to suppress an increase in pressure loss when the first fluid flows.

[0066] The isostatic strength of the first honeycomb structure 10 is not particularly limited, but is preferably 100 MPa or higher, more preferably 150 MPa or higher, and further preferably 200 MPa or higher. By setting the isostatic strength of the first honeycomb structure 10 to be 100 MPa or higher, the durability of the first honeycomb structure 10 can be improved.

[0067] Here, the "isostatic strength" in this specification can be measured according to the isostatic strength measurement method specified in JASO Standard M505-87, an automotive standard issued by the Japan Automotive Engineering Society.

[0068] The diameter (outer diameter) of the outer peripheral wall 11 of the first honeycomb structure 10 in a cross section perpendicular to the direction in which the cells 12 extend is not particularly limited, but is preferably 20 mm to 200 mm, more preferably 30 mm to 150 mm. This diameter improves heat recovery efficiency. If the outer peripheral wall 11 is not circular, the diameter of the outer peripheral wall 11 is determined by the diameter of the largest inscribed circle inscribed in the cross-sectional shape of the outer peripheral wall 11.

[0069] The thermal conductivity of the first honeycomb structure 10 is not particularly limited, but is preferably 50 W / (m·K) or higher at 25°C, more preferably 100 to 300 W / (m·K), and even more preferably 120 to 300 W / (m·K). By setting the thermal conductivity of the first honeycomb structure 10 within this range, the thermal conductivity is improved, thereby enabling efficient heat exchange between the first fluid flowing through the cells 12 of the first honeycomb structure 10 and the second fluid flowing through the cells 32 of the second honeycomb structure 30.

[0070] Here, the "thermal conductivity" in this specification refers to a value measured by a laser flash method (JIS R1611: 2010).

[0071] (Second Honeycomb Structure 30)

[0072] The second honeycomb structure 30 includes an outer peripheral wall 31, an inner peripheral wall 35, and partition walls 33 disposed between the outer peripheral wall 31 and the inner peripheral wall 35 to define a plurality of cells 32 serving as flow paths for the second fluid. The flow path for the second fluid extends from one end face 34a to the other end face 34b.

[0073] Preferably, the end faces 34a and 34b of the second honeycomb structure 30 are located further inward than the end faces 14a and 14b of the first honeycomb structure 10 in the axial direction (the direction in which the cells 12 and 32 extend) of the first honeycomb structure 10 and the second honeycomb structure 30. With such a structure, it is easy to provide an inlet (e.g., the end face 34b) and an outlet (e.g., the end face 34a) for the second fluid flowing through the second honeycomb structure 30, avoiding the flow of the first fluid.

[0074] The second honeycomb structure 30 can be divided into a plurality of parts in a cross section perpendicular to the extending direction of the cells 32. By dividing the second honeycomb structure 30 into a plurality of parts, the heat exchanger can be easily manufactured.

[0075] Here, a cross-sectional view perpendicular to the cell extending direction of a heat exchanger including a second honeycomb structure 30 divided into a plurality of parts is shown. Figure 2A and Figure 2B . Figure 2A This is an example of a heat exchanger including a second honeycomb structure 30 divided into four. Figure 2B This is an example of a heat exchanger including a second honeycomb structure 30 divided into two.

[0076] The number of divisions of the second honeycomb structure 30 is not particularly limited, but is typically 2 to 10. In addition, the sizes of the divided second honeycomb structures 30 may be the same or different.

[0077] The outer shape of the second honeycomb structure 30 (the shape of the outer peripheral wall 31) is not particularly limited. In a cross section perpendicular to the direction in which the cells 32 extend, Figure 1B In addition to the circle shown, an ellipse, a quadrilateral, or other polygons may also be used.

[0078] There is no particular limitation on the inner shape of the second honeycomb structure 30 (the shape of the inner peripheral wall 35). In a cross section perpendicular to the direction in which the cells 32 extend, Figure 1B In addition to the circle shown, an ellipse, a quadrilateral, or other polygons may also be used.

[0079] It should be noted that the outer shape and inner shape of the second honeycomb structure 30 may be the same or different, but are preferably the same from the perspective of resistance to external impact, thermal stress, etc. In addition, when the second honeycomb structure 30 is divided into a plurality of parts, the outer shape and inner shape of the second honeycomb structure 30 refer to the outer shape and inner shape of the state in which the divided second honeycomb structures 30 are combined.

[0080] The shape of the compartment 32 is not particularly limited. In a cross section perpendicular to the direction in which the compartment 32 extends, except for Figure 1B In addition to the quadrilateral shown, a circle, an ellipse, a triangle, a hexagon or other polygons may also be used.

[0081] The partition wall 33 preferably has the following shape in a cross section of the second honeycomb structure 30 perpendicular to the direction in which the cells 32 extend: Figure 1B The first partition walls 33a extending in the circumferential direction and the second partition walls 33b extending in the radial direction are shown. With such a structure, the first fluid flowing through the cells 12 of the first honeycomb structure 10 and the second fluid flowing through the cells 32 of the second honeycomb structure 30 can be efficiently exchanged with each other.

[0082] The thickness of the partition walls 33 is not particularly limited, but is preferably 0.05 to 1.0 mm, more preferably 0.2 to 0.6 mm. By setting the thickness of the partition walls 33 to 0.05 mm or greater, the mechanical strength of the second honeycomb structure 30 can be sufficiently enhanced. Furthermore, by setting the thickness of the partition walls 33 to 1.0 mm or less, problems such as increased pressure loss due to a reduced opening area and decreased heat recovery efficiency due to a reduced contact area with the second fluid can be suppressed.

[0083] The thickness of the outer peripheral wall 31 and the inner peripheral wall 35 is not particularly limited, but is preferably greater than the thickness of the partition wall 33. By setting such a structure, the strength of the outer peripheral wall 31 and the inner peripheral wall 35, which are easily damaged (for example, cracked or broken) by external impact, thermal stress caused by the temperature difference between the first fluid and the second fluid, etc., can be improved.

[0084] The thickness of the outer peripheral wall 31 and the inner peripheral wall 35 is not particularly limited and can be adjusted appropriately according to the application, etc. For example, the thickness of the outer peripheral wall 31 and the inner peripheral wall 35 is preferably 0.1 mm to 10 mm, more preferably 0.5 mm to 5 mm, and even more preferably 1 mm to 3 mm.

[0085] The second honeycomb structure 30 (outer peripheral wall 31, inner peripheral wall 35, and partition walls 33) is primarily composed of ceramic. "Mainly composed of ceramic" means that the mass of ceramic accounts for at least 50% by mass of the total mass of the components. The use of ceramics can reduce rust and deformation while also achieving weight reduction.

[0086] The ceramic is not particularly limited, but preferably contains silicon carbide (SiC) as its main component. Examples of ceramics containing silicon carbide (SiC) as its main component include Si-impregnated SiC, (Si+Al)-impregnated SiC, metal-composite SiC, recrystallized SiC, Si3N4, and SiC. Among these, Si-impregnated SiC and (Si+Al)-impregnated SiC are preferably used from the perspectives of low-cost production and high thermal conductivity.

[0087] The porosity of the outer peripheral wall 31, inner peripheral wall 35, and partition walls 33 is not particularly limited, but is preferably 10% or less, more preferably 5% or less, and even more preferably 3% or less. By setting the porosity of the outer peripheral wall 31, inner peripheral wall 35, and partition walls 33 to 10% or less, thermal conductivity can be improved.

[0088] The cell density of the second honeycomb structure 30 in a cross section perpendicular to the direction in which the cells 32 extend (i.e., the number of cells 32 per unit area) is not particularly limited, but is preferably 4 to 320 cells / cm 2 By setting the cell density to 4 cells / cm 2 As described above, the strength of the partition walls 33 can be sufficiently ensured, and further the strength and effective GSA (geometric surface area) of the second honeycomb structure 30 itself can be sufficiently ensured. 2 As a result, it is possible to suppress an increase in pressure loss when the second fluid flows.

[0089] The isostatic strength of the second honeycomb structure 30 is not particularly limited, but is preferably 100 MPa or more, more preferably 150 MPa or more, and even more preferably 200 MPa or more. By setting the isostatic strength of the second honeycomb structure 30 to 100 MPa or more, the durability of the second honeycomb structure 30 can be improved.

[0090] The diameter (outer diameter) of the outer peripheral wall 31 of the second honeycomb structure 30 in a cross section perpendicular to the direction in which the cells 32 extend is not particularly limited, but is preferably 30 mm to 400 mm, more preferably 40 mm to 300 mm. This diameter improves heat recovery efficiency. If the outer peripheral wall 31 is not circular, the diameter of the outer peripheral wall 31 is determined by the diameter of the largest inscribed circle inscribed in the cross-sectional shape of the outer peripheral wall 31.

[0091] The diameter (inner diameter) of the inner peripheral wall 35 of the second honeycomb structure 30 in a cross section perpendicular to the direction in which the cells 32 extend is not particularly limited, but is preferably 20 mm to 200 mm, more preferably 30 mm to 150 mm. If the cross-sectional shape of the inner peripheral wall 35 is not circular, the diameter of the inner peripheral wall 35 is determined by the diameter of the largest inscribed circle inscribed in the cross-sectional shape of the inner peripheral wall 35.

[0092] It should be noted that, when the second honeycomb structure 30 is divided into a plurality of parts, the diameters of the outer peripheral wall 31 and the inner peripheral wall 35 refer to the diameters of the outer peripheral wall 31 and the inner peripheral wall 35 when the divided second honeycomb structures 30 are combined.

[0093] The thermal conductivity of the second honeycomb structure 30 is not particularly limited, but is preferably 50 W / (m·K) or higher at 25°C, more preferably 100 to 300 W / (m·K), and even more preferably 120 to 300 W / (m·K). By setting the thermal conductivity of the second honeycomb structure 30 within this range, the thermal conductivity is improved, thereby enabling efficient heat exchange between the first fluid flowing through the cells 12 of the first honeycomb structure 10 and the second fluid flowing through the cells 32 of the second honeycomb structure 30.

[0094] (First tubular member 20)

[0095] The first tubular member 20 is disposed between the outer peripheral wall 11 of the first honeycomb structure 10 and the inner peripheral wall 35 of the second honeycomb structure 30 .

[0096] The first tubular member 20 is a tubular member having two end portions 21 a and 21 b , and the first fluid can flow therein.

[0097] Preferably, the ends 21a and 21b of the first tubular member 20 are located outside the end faces 14a and 14b of the first honeycomb structure 10 and the end faces 34a and 34b of the second honeycomb structure 30 in the axial direction of the first honeycomb structure 10 and the second honeycomb structure 30 (the direction in which the cells 12 and 32 extend). With such a structure, it is easy to avoid the flow of the second fluid and to provide an inlet (e.g., end 21a) and an outlet (e.g., end 21b) of the first fluid circulating inside the first tubular member 20.

[0098] From the viewpoint of thermal conductivity and manufacturability, the first tubular component 20 is preferably made of metal material. As metal, for example, stainless steel, titanium alloy, copper alloy, aluminum alloy, brass, nickel alloy, steel, lead, lead alloy etc. can be used. Wherein, based on the reason that cheap and durable reliability are high, preferred stainless steel. In addition, from the viewpoint of improving the corrosion resistance of the first tubular component 20, also the first tubular component 20 can be implemented surface treatments such as fluororesin lining, FRP lining.

[0099] From the perspective of stably suppressing mixing of the first fluid and the second fluid, the thickness of the first tubular member 20 is preferably 0.1 mm or greater, more preferably 0.5 mm or greater, and even more preferably 1 mm or greater. From the perspectives of cost, volume, weight, etc., the thickness of the first tubular member 20 is preferably 50 mm or less, more preferably 40 mm or less, and even more preferably 30 mm or less.

[0100] At least one end portion 21a, 21b of the first tubular member 20 may be reduced in diameter or expanded in diameter. Figure 3A In FIG. 1 , an example in which both end portions 21a and 21b of the first tubular member 20 are reduced in diameter is shown. Figure 3B It should be noted that Figure 3A and Figure 3B It is a cross-sectional view parallel to the direction in which the compartments 12 and 32 extend.

[0101] By reducing or expanding the diameters of the two end portions 21 a and 21 b of the first tubular member 20 , advantageous effects in terms of manufacturing such as facilitating connection with other members can be obtained.

[0102] It should be noted that in Figure 3A and Figure 3B In the figure, an example is shown in which both end portions 21a and 21b are reduced in diameter or expanded in diameter, but one end portion 21a and 21b may be reduced in diameter or expanded in diameter.

[0103] (First fluid and second fluid)

[0104] The first fluid and the second fluid are not particularly limited and may be gases, liquids, etc. Typically, the first fluid and the second fluid are gases. For example, the first fluid may be exhaust gas discharged from an industrial field, and the second fluid may be various gases requiring heating.

[0105] The flow direction of the first fluid is preferably opposite to the flow direction of the second fluid. By setting such a flow direction, the heat exchange efficiency between the first fluid and the second fluid can be improved.

[0106] (Method for manufacturing heat exchanger)

[0107] The method for manufacturing the heat exchanger is not particularly limited, and the heat exchanger can be manufactured according to a method known in the art. For example, the heat exchanger can be manufactured according to the method described below.

[0108] First, each honeycomb structure (the first honeycomb structure 10 and the second honeycomb structure 30) is produced. The production of each honeycomb structure is carried out as follows. First, a blank containing ceramic powder is extruded into a desired shape to produce a honeycomb formed body. At this time, by selecting a mold and a fixture of appropriate shape, the shape and density of the compartments 12 and 32, the shape and thickness of the outer peripheral walls 11 and 31, the partition walls 13 and 33, and the inner peripheral wall 35 can be controlled. In addition, the above-mentioned ceramics can be used as the material of the honeycomb formed body. For example, in the case of manufacturing a honeycomb formed body with Si impregnated SiC composite material as the main component, an adhesive, water and / or an organic solvent can be added to a predetermined amount of SiC powder, the obtained mixture can be kneaded to form a blank, and the blank can be formed to obtain a honeycomb formed body of the desired shape. Then, the obtained honeycomb formed body is dried, and metal Si is impregnated into the honeycomb formed body in a reduced pressure inert gas or vacuum and sintered, thereby obtaining each honeycomb structure.

[0109] Next, the first honeycomb structure 10 is inserted into the first tubular member 20, and the first tubular member 20 is fitted into the outer peripheral wall 11 of the first honeycomb structure 10, thereby obtaining a joint body of the first honeycomb structure 10 and the first tubular member 20. Next, the joint body is inserted into the inner peripheral wall 35 of the second honeycomb structure 30, and the first tubular member 20 of the joint body is fitted into the inner peripheral wall 35 of the second honeycomb structure 30.

[0110] It should be noted that the arrangement of the components and the order of fitting are not limited to the above, and can be appropriately changed within the scope of manufacturability. In addition, the above-mentioned method can be used for the fitting method.

[0111] <Implementation Method 2>

[0112] Figure 4A: is a cross-sectional view of the heat exchanger according to the second embodiment of the present invention, parallel to the direction in which the compartments extend. Figure 4B yes Figure 4A Cross-sectional view of the heat exchanger at line b-b' ( Figure 4A (a cross-sectional view of the heat exchanger perpendicular to the direction in which the compartments extend).

[0113] It should be noted that in Figure 4A and Figure 4B In the drawings, the components denoted by the same reference numerals as those in the above-mentioned figures represent the same components as those thereof, and thus detailed description thereof is omitted.

[0114] The heat exchanger of embodiment 2 of the present invention further includes a heat conducting member 40 disposed between the first honeycomb structure 10 and the first tubular member 20 and / or between the second honeycomb structure 30 and the first tubular member 20. By adopting such a structure, the heat exchange efficiency between the first fluid flowing through the cells 12 of the first honeycomb structure 10 and the second fluid flowing through the cells 32 of the second honeycomb structure 30 can be improved.

[0115] It should be noted that in Figure 4A and Figure 4B , an example is shown in which a heat conduction member 40 is arranged between the first honeycomb structure 10 and the first tubular part 20 and between the second honeycomb structure 30 and the first tubular part 20, but a heat conduction member 40 may also be arranged between the first honeycomb structure 10 and the first tubular part 20 or between the second honeycomb structure 30 and the first tubular part 20.

[0116] The thermally conductive member 40 is not particularly limited as long as it is a material having thermal conductivity, and examples thereof include a graphite sheet and a thermally conductive resin sheet.

[0117] The heat exchanger of embodiment 2 of the present invention can be manufactured according to methods known in the art. Specifically, when arranging and fitting the various components, it is sufficient to arrange the heat conducting member 40 between the first honeycomb structure 10 and the first tubular member 20 and / or between the second honeycomb structure 30 and the first tubular member 20.

[0118] <Implementation Method 3>

[0119] Figure 5 This is a cross-sectional view of a heat exchanger according to Embodiment 3 of the present invention, taken along a direction parallel to the direction in which cells extend.

[0120] It should be noted that in Figure 5 In the drawings, the components denoted by the same reference numerals as those in the above-mentioned figures represent the same components as those thereof, and thus detailed description thereof is omitted.

[0121] The heat exchanger according to the third embodiment of the present invention further includes a second tubular member 50 that fits into at least a portion of the outer peripheral wall 31 of the second honeycomb structure 30. Furthermore, the second tubular member 50 has an inlet 51 and an outlet 52 for the second fluid. With this structure, the inlet 51 and the outlet 52 for the second fluid can be easily provided away from the flow of the first fluid.

[0122] From the viewpoint of manufacturability, the second tubular component 50 is preferably made of metal material. As metal, for example, stainless steel, titanium alloy, copper alloy, aluminum alloy, brass, nickel alloy, steel, lead, lead alloy etc. can be used. Wherein, based on the reason that cheap and durable reliability are high, preferred stainless steel. In addition, from the viewpoint of improving the corrosion resistance of the second tubular component 50, also the second tubular component 50 can be implemented with surface treatments such as fluororesin lining, FRP lining.

[0123] From the perspective of durability, the thickness of the second tubular member 50 is preferably 0.1 mm or greater, more preferably 0.5 mm or greater, and even more preferably 1 mm or greater. From the perspectives of cost, volume, weight, etc., the thickness of the second tubular member 50 is preferably 50 mm or less, more preferably 40 mm or less, and even more preferably 30 mm or less.

[0124] like Figure 6 As shown, a heat insulating member 60 may be further disposed between the second honeycomb structure 30 and the second tubular member 50. Providing the heat insulating member 60 can suppress heat dissipation from the second tubular member 50 to the outside space, thereby improving the heat exchange efficiency between the first fluid flowing through the cells 12 of the first honeycomb structure 10 and the second fluid flowing through the cells 32 of the second honeycomb structure 30.

[0125] It should be noted that Figure 6 It is a cross-sectional view of the heat exchanger parallel to the direction in which the compartments extend.

[0126] The heat insulating material 60 is not particularly limited as long as it is a material having heat insulating properties, and examples thereof include glass wool, rock wool, and cellulose fiber.

[0127] The heat exchanger of Embodiment 3 of the present invention can be manufactured using methods known in the art. Specifically, the second tubular member 50 is simply fitted into the outer peripheral wall 31 of the second honeycomb structure 30. The arrangement of the components and the order of fitting are not limited to those described above and can be modified as appropriate within the limits of manufacturing capability. The fitting method described above can be used.

[0128] <Implementation Method 4>

[0129] Figure 7A: is a cross-sectional view of the heat exchanger of embodiment 4 of the present invention, parallel to the direction in which the compartments extend. Figure 7B yes Figure 7A Cross-sectional view of the heat exchanger at line c-c' ( Figure 7A (a cross-sectional view of the heat exchanger perpendicular to the direction in which the compartments extend).

[0130] It should be noted that in Figure 7A and Figure 7B In the drawings, the components denoted by the same reference numerals as those in the above-mentioned figures represent the same components as those thereof, and thus detailed description thereof is omitted.

[0131] The first honeycomb structure 10 of the heat exchanger of embodiment 4 of the present invention further includes an inner peripheral wall 15 forming a hollow region serving as a flow path for the third fluid.

[0132] The thickness of the inner peripheral wall 15 is not particularly limited, but is preferably greater than the thickness of the partition wall 13. By setting such a structure, the strength of the inner peripheral wall 15, which is easily damaged (e.g., cracked or broken) by thermal stress caused by the temperature difference between the first fluid and the third fluid, can be improved.

[0133] The thickness of the inner peripheral wall 15 is not particularly limited and can be appropriately adjusted according to the application, etc. For example, the thickness of the inner peripheral wall 15 is preferably 0.1 mm to 10 mm, more preferably 0.5 mm to 5 mm, and even more preferably 1 mm to 3 mm.

[0134] The shape of the inner peripheral wall 15 is not particularly limited. In a cross section perpendicular to the direction in which the compartment 12 extends, Figure 7B In addition to the circular shape shown, an ellipse, a quadrilateral, or other polygonal shape may be used. The shape of the outer peripheral wall 11 and the shape of the inner peripheral wall 15 may be the same or different, but are preferably the same from the viewpoint of resistance to thermal stress.

[0135] The diameter (inner diameter) of the inner peripheral wall 15 in a cross section perpendicular to the direction in which the compartment 12 extends is not particularly limited, but is preferably 150 mm or less, and more preferably 100 mm or less. If the cross-sectional shape of the inner peripheral wall 15 is not circular, the diameter of the inner peripheral wall 15 is the diameter of the largest inscribed circle inscribed in the cross-sectional shape of the inner peripheral wall 15.

[0136] The third fluid is not particularly limited and may be a gas, a liquid, etc. A typical third fluid is a gas. For example, various gases that require heating may be used as the third fluid.

[0137] The flow direction of the first fluid is preferably opposite to the flow direction of the third fluid. By setting such a flow direction, the heat exchange efficiency between the first fluid and the third fluid can be improved.

[0138] The heat exchanger according to the fourth embodiment of the present invention may further include a third tubular member 70 fitted to at least a portion of the inner peripheral wall 15 of the first honeycomb structure 10 .

[0139] Here, a cross-sectional view of the heat exchanger including the third tubular member 70 parallel to the direction in which the compartments extend is shown. Figure 8A In Figure 8A Cross-sectional view of the heat exchanger at line d-d' ( Figure 8A A cross-sectional view of the heat exchanger perpendicular to the direction in which the compartments extend is shown in FIG. Figure 8B middle.

[0140] like Figure 8A and Figure 8B As shown, the heat exchanger further includes a third tubular member 70 fitted with at least a portion of the inner peripheral wall 15 of the first honeycomb structure 10. The third tubular member 70 has an inlet 71 and an outlet 72 for the third fluid. This structure can stably suppress mixing of the first fluid and the third fluid.

[0141] Preferably, the inlet (end) 71 and the outlet (end) 72 of the third tubular member 70 are located further outward than the ends 21a and 21b of the first tubular member 20 in the axial direction of the first tubular member 20 and the third tubular member 70. With such a structure, it is easy to provide the inlet 71 and the outlet 72 for the third fluid away from the flow of the first fluid.

[0142] From the viewpoint of thermal conductivity and manufacturability, the 3rd tubular component 70 is preferably made of metal material.As metal, for example, stainless steel, titanium alloy, copper alloy, aluminum alloy, brass, nickel alloy, steel, lead, lead alloy etc. can be used.Wherein, based on the reason that cheap and durable reliability are high, preferred stainless steel.In addition, from the viewpoint of improving the corrosion resistance of the 3rd tubular component 70, also the 3rd tubular component 70 can be implemented surface treatments such as fluororesin lining, FRP lining.

[0143] From the perspective of stably suppressing mixing of the first fluid and the third fluid, the thickness of the third tubular member 70 is preferably 0.1 mm or greater, more preferably 0.5 mm or greater, and even more preferably 1 mm or greater. From the perspectives of cost, volume, weight, etc., the thickness of the third tubular member 70 is preferably 50 mm or less, more preferably 40 mm or less, and even more preferably 30 mm or less.

[0144] At least one end portion (inlet 71, outlet 72) of the third tubular member 70 may be reduced or expanded in diameter. By reducing or expanding the end portion of the third tubular member 70, advantages in manufacturing such as ease of connection with other components can be achieved.

[0145] The heat exchanger of embodiment 4 of the present invention can be manufactured according to methods known in the art. Specifically, except for selecting a mold and a fixture of appropriate shape to produce a honeycomb formed body in order to obtain the first honeycomb structure 10 having the inner circumferential wall 15, it can be manufactured by the same method as the heat exchanger of embodiment 1 of the present invention. In addition, when the third tubular component 70 is provided, it is sufficient to fit the third tubular component 70 with the inner circumferential wall 15 of the first honeycomb structure 10. The arrangement of the components and the order of fitting are not limited to the above, and can be appropriately changed within the range that can be manufactured. In addition, regarding the fitting method, the above method can be used.

[0146] Explanation of symbols

[0147] 10—first honeycomb structure; 11—outer peripheral wall; 12—compartment; 13—partition wall; 13a—first partition wall; 13b—second partition wall; 14a, 14b—end face; 15—inner peripheral wall; 20—first tubular component; 21a, 21b—end portion; 30—second honeycomb structure; 31—outer peripheral wall; 32—compartment; 33—partition wall; 33a—first partition wall; 33b—second partition wall; 34a, 34b—end face; 35—inner peripheral wall; 40—heat conducting member; 50—second tubular component; 51—inflow port; 52—exhaust port; 60—heat insulating member; 70—third tubular component; 71—inflow port; 72—exhaust port.

Claims

1. A heat exchanger, characterized in that: have: a first honeycomb structure having an outer peripheral wall and partition walls provided inside the outer peripheral wall and defining a plurality of cells serving as flow paths for a first fluid; a first tubular member fitted into the outer peripheral wall of the first honeycomb structure; as well as The second honeycomb structure includes an outer peripheral wall, an inner peripheral wall, and partition walls disposed between the outer peripheral wall and the inner peripheral wall to define a plurality of cells serving as flow paths for a second fluid, wherein the inner peripheral wall is fitted to the first tubular member.

2. The heat exchanger according to claim 1, characterized in that A heat conducting member is further provided. The heat conducting member is arranged between the first honeycomb structure and the first tubular member and / or between the second honeycomb structure and the first tubular member.

3. The heat exchanger according to claim 1 or 2, characterized in that In the axial direction of the first honeycomb structure body and the second honeycomb structure body, both end surfaces of the second honeycomb structure body are located on the inner side than both end surfaces of the first honeycomb structure body.

4. The heat exchanger according to claim 1 or 2, characterized in that In the axial direction of the first honeycomb structure and the second honeycomb structure, both end portions of the first tubular member are located outside both end surfaces of the first honeycomb structure and the second honeycomb structure.

5. The heat exchanger according to claim 1 or 2, characterized in that In the cross section of the first honeycomb structure and the second honeycomb structure perpendicular to the direction in which the cells extend, the partition walls include first partition walls extending in the circumferential direction and second partition walls extending in the radial direction.

6. The heat exchanger according to claim 1 or 2, characterized in that The second honeycomb structure body is divided into a plurality of parts in a cross section of the second honeycomb structure body that is perpendicular to a direction in which the cells extend.

7. The heat exchanger according to claim 1 or 2, characterized in that The first honeycomb structure and / or the second honeycomb structure contains ceramic as a main component.

8. The heat exchanger according to claim 7, characterized in that The ceramics take silicon carbide as a main component.

9. The heat exchanger according to claim 1 or 2, characterized in that The first cylindrical member is made of a metal material.

10. The heat exchanger according to claim 1 or 2, characterized in that At least one end portion of the first tubular member has a reduced or expanded diameter.

11. The heat exchanger according to claim 1 or 2, characterized in that The second honeycomb structure further includes a second tubular member fitted with at least a portion of the outer peripheral wall of the second honeycomb structure, wherein the second tubular member has an inlet and an outlet for the second fluid.

12. The heat exchanger according to claim 11, characterized in that A heat insulating material is further provided. The heat insulating material is arranged between the second honeycomb structure and the second tubular member.

13. The heat exchanger according to claim 1 or 2, characterized in that A flow direction of the first fluid is opposite to a flow direction of the second fluid.

14. The heat exchanger according to claim 1 or 2, characterized in that The first honeycomb structure further includes an inner peripheral wall forming a hollow region serving as a flow path for a third fluid therein.

15. The heat exchanger according to claim 14, characterized in that The honeycomb structure further includes a third tubular member fitted with at least a portion of the inner peripheral wall of the first honeycomb structure, wherein the third tubular member has an inlet and an outlet for the third fluid.

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