JP2003240473A - Heat exchanger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger in which a heat exchange efficiency is remarkably increased by satisfactorily joining a metal porous member to a metal flat plate. <P>SOLUTION: This heat exchanger comprises an exhaust gas pipe 41, a cylindrical body 42 forming a partition wall 2 formed of a metal plate forming a fluid passage 7 disposed in the exhaust gas pipe 41, an inlet pipe 8 for leading natural gas therein passing through the exhaust gas pipe 41 and installed in the cylindrical body 42 and an outlet pipe 9 for feeding natural gas, metal porous members 3 with open pores disposed in the cylindrical body 42, and fins 4 formed of metal porous members 3 vertically installed on the outer peripheral surface of the cylindrical body 42. The metal porous members 3 are diffusively joined to the inner wall surface of the tube body 42, a metal flat plate 10 forming the partition wall 2 is longitudinally extended in the cylindrical body 42, and the metal flat plate 10 is diffusively joined to the metal porous members 3. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention can be applied to heat exchange between objects, for example, to thermally decompose natural gas using the thermal energy of exhaust gas to reform into reformed fuel. The heat exchanger that can be.

[0002]

2. Description of the Related Art Conventionally, as a heat exchange device, JP-A-11-
There is one disclosed in Japanese Patent No. 6601. The heat exchange device includes a first-stage heat exchanger and a second-stage heat exchanger provided in an exhaust passage that heats steam with exhaust gas from the engine. The first-stage heat exchanger is composed of a steam passage arranged in the first casing, through which steam flows, and an exhaust gas passage arranged in the steam passage, in which exhaust gas flows. The second-stage heat exchanger has a water / steam passage arranged in the second casing provided below the first casing and capable of storing water, and an exhaust gas arranged around the water / steam passage for flowing exhaust gas. It is composed of a gas passage. A porous ceramic member is arranged in each passage.

Further, in Japanese Patent Laid-Open No. 11-93777,
Discloses a heat exchanger applied to a natural gas reformer
Has been done. The natural gas reformer is a
CH_FourCO and H₂Which is pyrolyzed into the reformed fuel of
To improve thermal efficiency and reduce CO in exhaust gas.₂The heat
CO in exhaust gas emitted when used for solution₂Reduced content
To do. Natural gas reformer is an exhaust gas pipe
The exhaust gas passage body that forms the exhaust gas passage is placed inside,
A gas fuel case in which gas fuel flows outside the exhaust gas pipe
Gas to form a gas fuel passage in the gas fuel case.
A porous member made of porous ceramics is
CH on the surface of the porous member_FourAnd CO₂CO and H ₂Reformed combustion of
Coated with a catalyst that has the function of converting to gas
A heat insulating material is arranged on the outer circumference of the material pipe.

[0004]

By the way, it is effective to use a high-efficiency heat exchanger for the system for recovering the thermal energy of the exhaust gas discharged from the engine. That is, as a heat shield type turbo compound engine,
When the fuel is natural gas and the combustion chamber has a heat shield structure,
In the engine, in order to convert fuel energy into maximum power and use it, the thermal energy of exhaust gas must be maximized and converted into power. As a heat exchanger, in heat exchange between gases, the heat exchange efficiency is important. The higher the heat exchange efficiency, the better the heat utilization rate, and the better the overall heat efficiency. In terms of heat exchanger performance,
The heat transfer coefficient and the heat conductivity of the working fluid influence, and in order to move heat smoothly, it is better that the resistance is small.

The equation of the heat transmission rate K is as shown in the following equation. The unit of the heat transmission rate (K) is Kcal / m ² · ° C · h. 1 / K = (1 / αg) (As / Ag) + (δ / λ) (As / Awl) +
(1 / αc) (As / Ac) where αg is the high temperature gas heat transfer coefficient, λ is the solid heat conductivity, α
c is the heat transfer coefficient at low temperature, δ is the wall thickness of the wall or the length of the heat conductor, As is the average area of the heat transfer path, and Ag, Awl, Ac are the contact areas of the heat transfer member. When the numbers of the heat exchanger are applied to the above equation, the heat transfer coefficient on the gas side is particularly small,
It can be seen that it has a large resistance to heat conduction. Further, when compared with the term of the thermal conductivity of the material, the value is about 10 times, and unless the heat transfer coefficient becomes large, the performance of the heat exchanger cannot be improved. However, all terms in the above equation have areas for heat transfer and heat conduction, and the heat transfer amount of the heat transfer body can be controlled by increasing or decreasing those areas. For example, when heat from a gas moves through a solid to another fluid, increasing the heat transfer area increases the heat transfer rate K. Therefore, a means for forming a material having an extremely large area, for example, a fin shape, a bellows shape, or the like, is used for the portion through which the gas passes. However, even if the fins are provided on the heat passage surface, the heat transfer surface is only about 3 to 4 times, and it is extremely difficult to raise it to 10 times.

[0006] In recent years, research has been advanced to form a metal porous member by using a heat-resistant metal as a foam, and as its application, many researches have been advanced on the assumption that a filter or the like is good. In the material of the metal porous member, since the metal is entangled and intersects three-dimensionally, the outer surface area per same volume is 6
About twice as much. Therefore, if a metal porous member is joined to a metal flat plate and a working fluid is passed through, the gas passes through the gap of the porous material while colliding with the surface, and transfers heat to the solid. The heat transferred to the solid is conducted to a flat plate having two working fluids as partition walls, and the heat is transferred to another working fluid. Since the heat transfer coefficient is small on the other working fluid side as well, a heat transfer area commensurate with that value is required. For example, (1 / αg) (As / A
If the value of g) is made small and the ratio of the heat transfer coefficient on the high-temperature gas side is 10 for the normal heat conductor, the ratio of the heat transfer coefficient of the solid is 1, and the ratio of the heat transfer coefficient on the liquid side is 3, then K = 1. / (10 + 1
+3) = 0.071. On the other hand, if the area on the heat transfer side can be increased by using a porous material and the heat transfer surface and the heat transfer surface can be made equivalent, K = 1 / (1 + 1 + 1) =
0.333, heat transfer rate K (Kcal / m ² · ° C · h)
The value of becomes 4.7 times.

[0007]

SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to increase the area of a heat transfer side by using a metal porous member and to diffuse-bond the metal porous member and a partition wall for heat conduction. Rate, thereby increasing the heat transmission rate K, improving the thermal efficiency of the engine, etc., for example, heat exchange applicable to a fuel reformer that reforms natural gas into reformed fuel of CO and H _2. Is to provide a vessel.

According to the present invention, in a heat exchanger for transferring heat from one object having a different temperature to another object, the objects are shielded from each other by a metal partition wall.
A metal porous member is disposed in a heat exchange area occupied by at least one of the objects, and a joint portion in which the metal porous member and the partition wall are in contact with each other is joined to each other with a joining metal material. The present invention relates to a heat exchanger characterized in that the metal joining member is impregnated and embedded in the metal porous member.

The porous metal member is a material having open pores, and when one of the objects is a gas, the pore is largely opened so as not to have a great resistance to gas flow, and the partition wall is formed. The heat transfer area of the joint surface of the porous metal member is 1/10 to 10 of the heat transfer area of the partition wall.
It is configured to be about 1/15.

In this heat exchanger, when one of the objects is a gas and the other object is a liquid, a large number of tall metal porous members are arranged in parallel in a region through which the gas passes. The metal porous member having a short height is partially provided in a region where the liquid passes.

Alternatively, when one of the objects is a solid,
The partition wall is formed integrally with the solid body.

[0012] Alternatively, the heat exchanger is arranged in a gas pipe having an inlet and an outlet through which one of the gases flows, and inside the gas pipe through which the other gas flows, when the objects are gases. A metal cylinder forming the partition wall, and an inlet pipe and an outlet pipe penetrating the gas pipe and provided in the cylinder, respectively, and the metal porous member is arranged in the cylinder. At the same time, a fin formed of the metal porous member is erected on the outer peripheral surface of the cylindrical body, and the fin and the metal porous member are mutually joined to the wall surface of the cylinder by diffusion bonding with the bonding metal material. It is joined.

In this heat exchanger, a metal flat plate extends in the longitudinal direction in the cylinder body, and the metal flat plate and the metal porous member arranged in the cylinder body are bonded to each other by the bonding metal material. ing.

The fins are erected on the outer peripheral surface of the cylindrical body at intervals in a comb-like shape, and are formed to have a large contact area for passage of the gas.

In this heat exchanger, the joining surface between the metal porous member and the metal flat plate is formed by grinding the surface of the metal porous member so that the metal is well fitted to the cut surface of the metal porous member. The above-mentioned joining metal material is applied, the above-mentioned metal porous member is arranged in the above-mentioned cylinder, and 1050 ° C-115
The metal porous member and the cylindrical body are pressure-bonded in a vacuum chamber at 0 ° C.

The outer side of the gas pipe is covered with an outer pipe forming a vacuum layer having a thermal heat shield function.

In this heat exchanger, the gas flowing in the gas pipe is exhaust gas, the fluid flowing in the cylinder is natural gas, and the natural gas flows in the cylinder to generate H ₂ gas. It is thermally decomposed into CO and reformed into reformed fuel.

In this heat exchanger, the gas pipe is an exhaust manifold, and the tubular body is arranged in a collecting portion at a boundary between a branch pipe and a collecting pipe of the exhaust manifold.

In this heat exchanger, when the object is a high temperature liquid and a gas, the metal porous member is composed of a metal containing nickel, chrome, steel or the like as a main component, and the object is water. In the case of a liquid such as the above, the metal porous member is made of a metal such as aluminum or copper, or a metal obtained by coating a nickel or chromium material with aluminum.

In this heat exchanger, the surface of the metal porous member is coated with a metal having a high thermal conductivity, such as silver, copper or aluminum.

In this heat exchanger, aluminum is attached to the surface of the metal porous member, the surface is oxidized, and platinum, vanadium, nickel,
Fine particles of catalytic metal such as ruthenium and aluminum oxide are attached.

In this heat exchanger, the joining metal material is composed of a synthetic powder of 55 wt% nickel, 25 wt% chrome, 10 wt% aluminum, and 10 wt% silica.

This heat exchanger is constructed as described above, and the contact surface between the metal part of the metal porous member and the partition wall serves as a joint surface, and the other open pores are impregnated with the joint metal material and embedded. It is in the state of diffusion bonding. Therefore,
The heat conduction between the partition wall and the porous metal member is extremely good, and the heat exchange is achieved with extremely high efficiency. In this heat exchanger, the cylindrical body and the fins, the cylindrical body and the metal porous member inside the cylindrical body, and the metallic porous member and the metal flat plate inside the cylindrical body are diffusion-bonded to each other at a joint portion via a flux. , The structures are continuously and extremely strongly joined, which improves the heat transfer and improves the heat exchange efficiency. Further, the metal porous member has a large surface area, has good air permeability, becomes a sponge-like solid, and has a large contact area with a fluid for heat exchange, resulting in a large increase in heat exchange efficiency. Further, in this heat exchanger, the surface of the metal porous member is joined to one surface of the flat plate, and the fin made of the metal porous member is joined to the other surface of the flat plate.
The metal porous member has a structure in which solids having different surface roughness are bonded. Further, since the metal flat plate is located between the surface on the heat radiating side and the surface on the heat receiving side, and the metal flat plate forms a partition wall for the fluid, the fluid and the fin passing through the metal porous member are There is no mixing with the fluid passing through and heat can be transferred efficiently.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a heat exchanger according to the present invention will be described below with reference to the drawings. FIG. 1 is an enlarged sectional view for explaining the principle of a joint between a metal porous member and a partition in a heat exchanger according to the present invention, and FIG. 2 is a sectional view showing an embodiment of the heat exchanger according to the present invention. 3 is a cross-sectional view showing another embodiment of the heat exchanger according to the present invention, FIG. 4 is a cross-sectional view showing yet another embodiment of the heat exchanger according to the present invention, and FIG. 5 is a cross-sectional view taken along line I-I of FIG. Sectional view showing the exchanger,
6 and 6 are enlarged cross-sectional views of the heat exchanger indicated by reference sign A in FIG.

First, the basic structure of the heat exchanger according to the present invention will be described with reference to FIG. The heat exchanger according to the present invention is a heat exchanger that transfers heat from one object having a different temperature to the other object, and the objects are shielded from each other by a metallic partition wall 2, and the heat occupied by at least one object is A metal porous member 3 is disposed in the exchange area. In particular, as shown in FIG. 1, the joint portions of the metal porous member 3 and the partition wall 2 that are in contact with each other are joined together by the joining metal material 1, The metal porous member 2 is impregnated with the bonding metal material 1 and embedded therein, that is, the bonding portion is diffusion bonded. That is, the metal porous member 3 is formed by laminating metal materials such as metal wires and metal particles, and the open pores formed between the metal portions to which the contact portions or intersections of the metal materials are joined and the adjacent metal portions. It consists of and. In particular, at the joint between the partition wall and the metal porous member 3, the open pores of the metal porous member 3 are in a state of diffusion bonding in which the bonding metal material 1 is impregnated and embedded, and the partition wall and the metal porous member 3 are embedded. Since there is no heat-shielding surface between the member 3 and the member 3, the thermal conductivity is increased.

In this heat exchanger, the metal porous member 3
Is a material having open pores, and when one of the objects is a gas, that is, gas, the pore portion is greatly opened so as not to have a great resistance to gas flow, and the metal porous member 3 with respect to the partition wall 2 is The heat transfer area of the joint surface 20 is configured to be about 1/10 to 1/15 of the heat transfer area of the partition wall 2. In other words, the metal portion of the metal porous member 3 and the partition wall 2
The joint surface 20 with is 1/10 to 1/15 of the entire surface of the partition wall 2.
The other open pores are impregnated with the bonding metal material 1 and are in a buried diffusion bonding state.
Therefore, in this heat exchanger, the partition wall 2 and the metal porous member 3 are
The heat conduction between and becomes extremely good, and heat exchange is achieved with extremely high efficiency.

An embodiment of the heat exchanger according to the present invention will be described with reference to FIG. In this heat exchanger, when one object is gas and the other object is liquid, a partition plate 30 forming the partition 2 is arranged in the housing 27. In the region of the gas passage 31 through which the gas G passes, metal porous blocks 28 made of a large number of tall metal porous members 3 are arranged in parallel so as to form a gap 43. The quality block 28 is a partition plate 30.
In addition, diffusion bonding is performed on the bonding surface 20 by the bonding metal material 1. The liquid passage 3 through which the liquid L passes
A metal porous block 29 made of a short metal porous member 3 is partially provided in the region 2 and the metal porous block 29 is diffused to the partition plate 30 at the bonding surface 20 by the bonding metal material 1. It is joined.

Another embodiment of the heat exchanger according to the present invention will be described with reference to FIG. In this heat exchanger, when one object is the solid 33, the partition wall 39 located at the boundary with the solid 33 is formed integrally with the solid 33.
A casing 34 forming a liquid passage 36 through which the liquid L such as water flows is fixed to the solid 33. Casing 3
An inlet pipe 37 for sending the liquid L such as water to the liquid passage 36 and an outlet pipe 38 for sending out the heat-exchanged water are attached to the liquid passage 4. In the liquid passage 36, a partition wall portion 39 and a metal flat plate 40 that form the partition wall 2 are arranged, and the partition wall portion 39 and the metal flat plate 40 include a metal porous member 35 that forms the metal porous member 3 of FIG. The joining surfaces 20 are diffusion-bonded to each other by the joining metal material 1.

Next, still another embodiment of the heat exchanger according to the present invention will be described with reference to FIGS. This heat exchanger comprises a gas plate 41 having a gas inlet 5 into which a gas is introduced and a gas outlet 6 from which a gas is sent out, and a metal plate constituting a fluid passage 7 arranged in the gas pipe 41. And a tubular body 42 that composes the partition wall 2 that is made up of an inlet pipe 8 that penetrates the gas pipe 41 and that is provided in the tubular body 42, into which the fluid is introduced, an outlet pipe 9 through which the fluid is delivered, and a tubular body 42 that are disposed inside the tubular body 42. Metal porous member 3 having open pores and cylindrical body 42
Has fins 4 formed of a metal porous material standing on the outer peripheral surface of the. A flange portion 26 is provided at the end of the inlet pipe 8 and a flange portion 25 is provided at the end of the outlet pipe 9. The flange portion 26 of the inlet pipe 8 is connected to the fuel pipe fed from the natural gas supply tank, and the flange portion 25 of the outlet pipe 9 is connected to the intake pipe and the reformed fuel pipe for supplying the reformed fuel to the engine. Has been done.

Inside the gas pipe 41, a cylinder 42 constituting the partition wall 2 shown in FIG. 1 is arranged, and a plurality of cylinders 42 are arranged inside the metal outer tube 22 and the outer tube 22. It is comprised from the metal flat plate 10 which comprises the partition wall 2 shown in FIG. The outer tube 22 constitutes the heat exchange section 16. The metal porous member 3 is diffusion bonded to the inner wall surface of the cylindrical body 42 by the bonding metal material 1. A metal flat plate 10 extends in the longitudinal direction in the cylindrical body 42, and the metal flat plate 10 and the metal porous member 3 arranged in the cylindrical body 42 are diffusion bonded by the bonding metal material 1. The fin 4 is erected on the outer peripheral surface of the cylindrical body 42 with a gap 19 in a comb shape and is made of a porous metal material 21 and has a large gas passage contact area.

The joining surface of the metal porous member 3 and the metal flat plate 10 is formed by grinding the surface of the metal porous member 3 and joining metal material 1 which is well suited to the metal on the cutting surface of the metal porous member 3. A certain flux is applied, the metallic porous member 3 is placed in the cylindrical body 42, and the metallic porous member 3 and the cylindrical body 42 are bonded in a vacuum chamber at 1000 ° C to 1150 ° C.

The joining metal material 1, that is, the flux, is composed of a synthetic powder of 55 wt% nickel, 25 wt% chrome, 10 wt% aluminum, and 10 wt% silica. The surface of the metallic porous member 3 is coated with a metal having a high thermal conductivity, such as silver, copper or aluminum.

The gas pipe 41 is formed in double walls, and the space between the double walls is formed in the vacuum layer 11 having a thermal heat shield function. Aluminum is adhered to the surface of the metal porous member 3, the surface is oxidized, and fine particles of a catalytic metal such as platinum and vanadium are adhered to the surface. The metal forming the metal porous member member 3 is composed of a metal containing nickel, chrome, steel or the like as a main component.

The gas flowing through the gas pipe 41 is exhaust gas, and the fluid flowing inside the cylinder 42 is natural gas.
As natural gas flows in the cylinder 42, H ₂ and CO
And is thermally decomposed into reformed fuel.

-Example-Generally, joining flat plates using flux is
It is relatively easy, but it is difficult to join the porous material and flat plate. If the flat plates are coated with flux, the porous materials are overlaid, and they are left under pressure in a high-temperature furnace, they should be able to join, but the current situation is that they cannot be joined. Therefore, as a result of detailed examination of the material in which the porous metal material and the flat metal plate were joined, the following was found. 1. 1000 ℃ for joining metal porous material and metal flat plate
An atmosphere furnace capable of heating above is required. 2. At the joint between the metal porous material and the metal flat plate, a flux of a composite material capable of diffusion bonding the two materials is required. 3. If both the metal porous material and the metal flat plate are pressed together with excessive pressure, the metal porous material is thermally deformed and crushed. 4. When the metal porous material and the metal flat plate are bonded in the air, the flux is oxidized and the bonding is impaired. 5. If the metal porous material is too dense, the flux will seep into the metal porous material due to the capillary phenomenon, resulting in poor bonding.

In view of the above, the heat exchanger according to the present invention is specified as follows when joining the porous metal material and the flat metal plate. 1. For joining the metal porous material and the metal flat plate, a joining temperature is set to 1000 ° C. using a vacuum furnace. 2. As the flux ratio for joining the metal porous material and the metal flat plate, Cr: 18 to 20%, Si: 10%, C:
0.2% and the balance Ni. 3. Add 2-3% of palladium to the flux. 4. The joining of the porous metal material and the flat metal plate does not increase the pressing force so much. Under the above conditions, a flat plate having a thickness of 1 mm and a porous metal plate having a thickness of 10 mm were stacked and the bonding treatment was performed for 30 minutes. As a result, both materials could be joined.

A joining test was carried out by using SUS304 as the metal flat plate and using a Ni--Cr composite material as the metal porous material to prepare a test piece that could be joined. As a result of cutting the test piece and observing the joining state, the fiber structure of the metal porous material and the metal flat plate are diffusion-bonded through the brazing material,
No incomplete joint was found on the joint surface 20. Therefore, it was confirmed that the metal porous member and the metal flat plate could be joined under the above test conditions. The joining test conditions for the metallic porous member and the metallic flat plate are as follows. Metal plate 1
0 is SUS304 steel, and the metal porous member 3 is 78 wt% Ni and 22 wt% Cr. Also,
The flux that is the joining metal material 1 is Ni: 54 wt%,
Cr: 34 wt%, Si: 10 wt%, C: 0.5 wt
% And the balance is vanadium. Joining condition is 1000
C to 1150C. The furnace used is a vacuum furnace.

Next, a description will be given of an embodiment in which this heat exchanger is constructed as described above and applied as the exhaust manifold 12. When this heat exchanger is applied as the exhaust manifold 12, the gas pipe 41 constitutes the outer pipe of the exhaust manifold 12. The cylindrical body 42 is arranged in the collecting portion 15 at the boundary between the branch pipe 13 and the collecting pipe 14 of the exhaust manifold. The branch pipe 13 and the collecting pipe 14 are formed as a double pipe, and an air layer 17 is formed at an intermediate portion of the double pipe. A flange portion 23 is provided at an end portion of the branch pipe 13, and a flange portion 24 is provided at an end portion of the collecting pipe 14. The flange portion 23 of the branch pipe 13 is connected to an exhaust port formed in the cylinder head. Also,
The flange portion 24 of the collecting pipe 14 is connected to an exhaust pipe that exhausts exhaust gas. On the side of the branch pipe 13 of the fin 4,
Exhaust gas EG exhausted from the engine, which is joined to the partition plate 18, is guided by the partition plate 18 through the branch pipe 13 connected to each cylinder to bypass and cross the fin 4 from the side surface of the fin 4. It is configured to flow and be discharged to the collecting pipe 14.

This heat exchanger has a function of reforming the natural gas F as a fuel supplied to the engine. The natural gas F flows in from the inlet pipe 8 of the tubular body 42, traverses the metal porous member 3, and at that time, is thermally decomposed into CO and H ₂ by the heat energy of the exhaust gas EG and becomes a reformed fuel. The reformed fuel sent from the outlet pipe 9 is supplied to the engine, ignited and burned and consumed. The exhaust gas EG crosses the fins 4 from the branch pipe 13 and at that time gives thermal energy to the natural gas, and the natural gas is thermally decomposed.

In this embodiment, the heat exchanger has a cylindrical body 42.
Although the example has been described where the fluid flowing through is natural gas, not only natural gas but also water can be used. When the fluid flowing in the cylinder 42 is water, the water receives heat energy from the exhaust gas EG and becomes water vapor. For example, steam can drive a steam turbine in a Rankine cycle, drive a generator by driving the steam turbine, recover electrical energy, or secure driving force by driving the steam turbine.

[0041]

Since the heat exchanger according to the present invention is configured as described above, the joint surface between the partition wall and the porous metal member is diffusion-joined by the joining metal material, that is, the flux.
The heat insulating surface between the partition wall and the porous metal member is eliminated, the thermal conductivity between the two is improved, and the heat exchange efficiency between the objects is greatly improved. In addition, since a fluid such as natural gas or exhaust gas flows through the metal porous member, the area in which the fluid contacts the metal porous member is greatly increased, and the heat exchange efficiency can be greatly increased.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view for explaining the principle of a joint portion between a metal porous member and a partition in a heat exchanger according to the present invention.

FIG. 2 is a sectional view showing an embodiment of the heat exchanger according to the present invention.

FIG. 3 is a sectional view showing another embodiment of the heat exchanger according to the present invention.

FIG. 4 is a sectional view showing still another embodiment of the heat exchanger according to the present invention.

5 is a cross-sectional view showing the heat exchanger taken along the line I-I in FIG.

6 is an enlarged cross-sectional view of the heat exchanger indicated by reference sign A in FIG.

[Explanation of symbols]

1 joining metal material 2 metal partition 3 Metal porous member 4 fins (metal porous member) 5 gas inlet 6 gas outlet 7 fluid passage 8 inlet tubes 9 outlet pipe 10 Metal flat plate 11 vacuum layer 12 Exhaust manifold 13 Branch pipe 14 Collecting pipe 15 Assembly Department 16 heat exchange section 17 Air layer 18 Partition plate 19 gap 20 Bonding surface 21 Porous material 22 outer tube 23, 24, 25, 26 Flange part 27 housing 28 Metal porous member (tall) 29 Metallic porous member (short) 30 metal partition 31 gas passage 32 liquid passage 33 Solid (Object) 34 housing 35 Metal Porous Member 36 Liquid passage 37 Inlet pipe 38 Outlet pipe 39 Metal partition 40 metal plate 41 gas pipe 42 cylinder EG Exhaust gas (object) F Fuel (object) G gas (object) L liquid

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B23K 35/30 310 B23K 35/30 310D C22C 19/05 C22C 19/05 B F28D 7/10 F28D 7/10 A F28F 13/18 F28F 13/18 D F term (reference) 3L103 AA05 AA35 BB19 BB39 CC02 CC26 CC27 DD09 DD15 DD38 DD63 4E067 AA03 AA09 AA20 AB05 AC07 AD07 BA00 DB01 DC03 DC06 EB01

Claims (15)

[Claims] 1. A heat exchanger for transferring heat from one body having a different temperature to another body, wherein the bodies are shielded from each other by a metal partition wall, and a heat exchange area occupied by at least one body is provided. Is provided with a metal porous member, and the metal porous member and the partition wall are joined to each other at their joints which are in contact with each other, and the metal porous member in the joint has the metal joint member. A heat exchanger characterized by being impregnated and buried. 2. The porous metal member is a material having open pores, and when one of the objects is a gas, the pore portion is largely opened so as not to have great resistance to gas flow, The heat transfer area of the joint surface of the metal porous member to the partition is 1/10 of the heat transfer area of the partition.
The heat exchanger according to claim 1, wherein the heat exchanger is configured to have a size of about 1/15. 3. When one of the objects is a gas and the other object is a liquid, a large number of tall metal porous members are arranged in parallel in a region through which the gas passes,
The heat exchanger according to claim 1 or 2, wherein the short metal porous member is partially provided in a region through which the liquid passes. 4. The heat exchanger according to claim 1, wherein when one of the objects is a solid, the partition wall is formed integrally with the solid. 5. A metal constituting a gas pipe having an inlet and an outlet through which one of the gases flows, and the partition wall arranged in the gas pipe through which the other gas flows, when the objects are gases. A cylindrical body, and an inlet pipe and an outlet pipe penetrating the gas pipe and provided in the cylindrical body, respectively. The metallic porous member is disposed in the cylindrical body, and A fin formed of the metal porous member is erected on the outer peripheral surface, and the fin and the metal porous member are joined to each other on the wall surface of the cylindrical body by diffusion joining with the joining metal material. The heat exchanger according to claim 1 or 2, which is characterized. 6. A metal flat plate forming the partition wall extends in the longitudinal direction in the cylinder, and the metal flat plate and the metal porous member arranged in the cylinder are bonded to each other by the bonding metal material. The heat exchanger according to claim 5, wherein the heat exchanger is provided. 7. The fins are erected on the outer peripheral surface of the cylindrical body at intervals in a comb-like shape with a large contact area for passing the gas. The heat exchanger described. 8. The joining surface of the metal porous member and the flat metal plate is such that the surface of the metal porous member is ground and the metal is well fitted to the cut surface of the metal porous member. 6. A material is applied, the metallic porous member is arranged in the cylindrical body, and the metallic porous member and the cylindrical body are pressure-bonded to each other in a vacuum chamber at 1050 ° C. to 1150 ° C. The heat exchanger according to claim 1. 9. The heat according to claim 5, wherein the outer side of the gas pipe is covered with an outer pipe forming a vacuum layer having a thermal heat shield function. Exchanger. 10. The gas flowing through the gas pipe is exhaust gas, the fluid flowing through the cylinder is natural gas, and the natural gas flows through the cylinder to generate H ₂ and CO. The heat exchanger according to claim 5, wherein the heat exchanger is decomposed and reformed into a reformed fuel. 11. The gas pipe is an exhaust manifold,
The heat exchanger according to any one of claims 5 to 10, wherein the cylindrical body is arranged in a collecting portion at a boundary between a branch pipe and a collecting pipe of the exhaust manifold. 12. The surface of the metal porous member is coated with a metal having a high thermal conductivity, such as silver, copper, or aluminum, according to any one of claims 1 to 11. Heat exchanger. 13. When the object is a high temperature liquid or gas, the metal porous member is composed of a metal containing a component such as nickel, chrome or steel as a main component, and the object is a liquid such as water. In this case, the heat-exchanger according to claim 1, wherein the metal porous member is made of a metal such as aluminum or copper, or a metal of nickel or chrome material coated with aluminum. 14. Aluminum is adhered to the surface of the metal porous member, the surface is oxidized, and fine particles of a catalytic metal such as platinum, vanadium, nickel, ruthenium, and aluminum oxide are adhered to the surface. The heat exchanger according to any one of claims 1 to 13, characterized in that. 15. The joining metal material comprises 55 w of nickel.
t%, chrome 25wt%, aluminum 10wt
%, And silica composed of 10 wt% of synthetic powder.
The heat exchanger according to item.