KR20240053364A - Heat Exchanger for Solid Oxide Fuel Cell and Manufacturing Method Thereof - Google Patents

Abstract

Multiple rectangular heat partitions are installed in an overlapping arrangement at regular intervals so that entrances can be arranged differently between the upper and lower floors and multiple entrances can be formed on each floor, and fluid flow is installed at both ends of the space between the heat partitions. Frames that surround the space between the heat partitions with an entrance for entry and exit formed, and heat partitions installed inside the frames and located on both sides, are integral with each other and exchange heat while contacting the fluid passing inside the frames. A heat exchanger for a solid oxide fuel cell including heat dissipation fins is provided.

Description

Heat exchanger for solid oxide fuel cell and manufacturing method thereof {Heat Exchanger for Solid Oxide Fuel Cell and Manufacturing Method Thereof}

The present invention relates to a heat exchanger for a solid oxide fuel cell and a method of manufacturing the same. The heat exchanger for a solid oxide fuel cell and its manufacturing method include a heat exchanger for a solid oxide fuel cell in which the laminated parts are brazed while being pressed at a uniform pressure as a whole, so that they are joined uniformly as a whole and the dimensional accuracy of the product is improved. It is about manufacturing method.

A solid oxide fuel cell is a highly efficient, pollution-free power generation device that directly converts the chemical energy of hydrogen and oxygen into electrical energy through an electrochemical reaction. The fuel cell stack contains oxygen at the cathode and hydrogen at the anode. This is supplied, and an electrochemical reaction proceeds as a reverse reaction of electrolysis of water, generating electricity.

Since solid oxide fuel cells generally operate at high temperatures of 700°C to 1000°C, it is desirable to preheat the hydrogen gas and air supplied to the fuel cell stack to some extent before supplying them.

A conventional solid oxide fuel cell system is equipped with a heat exchanger to use the heat of high-temperature combustion gas discharged from the fuel cell stack to preheat air, hydrogen gas, etc.

Conventional heat exchangers are mainly used as plate-fin heat exchangers, which have a structure in which plates and heat dissipation fins are alternately stacked.

In a heat exchanger as described above, heat exchange occurs between fluids moving between layers between plates, and at this time, an entrance and exit is formed at the same location between layers between each plate.

Meanwhile, the plate fin type heat exchanger is manufactured by alternately stacking plates and heat dissipation fins and then brazing them. During the stacking process, the insertion hole formed in the plate and heat dissipation fin is inserted into the support bar, and then a nut is fastened to the end of the support bar to bring the plate and heat dissipation fin into close contact.

However, in the manufacturing method of the plate fin type heat exchanger as described above, the tightening pressure of the nuts is different, so it is easy to generate a distorted shape.

The present invention was made with the above-described point in mind. The fluid inlets and inlets can be arranged differently between adjacent layers, and the plates and heat dissipation fins can be pressed with an overall uniform pressure when manufacturing a heat exchanger, resulting in excellent bonding quality between parts. The purpose is to provide a heat exchanger for solid oxide fuel cells and a method for manufacturing the same.

The heat exchanger for a solid oxide fuel cell proposed by the present invention includes heat transfer partitions arranged at regular intervals, and fluid inlets for fluid inflow and out at both ends of the space between the heat transfer partitions, and a space between the heat transfer partitions. It includes frames installed to surround and heat-dissipating fins installed inside each of the frames and exchanging heat while contacting fluid passing through the frames.

The frames include first frames installed to form the fluid inlet at the center of both ends of the space between the heat partitions, and the fluid inlet at both sides of both ends of the space between the heat partitions. It consists of second frames installed to form.

Here, the first frames and the second frames are installed alternately in the space between the heat partitions.

In addition, the method of manufacturing a heat exchanger for a solid oxide fuel cell proposed by the present invention includes a plurality of guide pins, a plurality of square plate-shaped partition base materials each with guide holes drilled at the corners, each with the guide holes drilled at the corners, and each other. A plurality of square ring-shaped first frame base materials in which first protrusions are formed on the inside of both side portions of two parallel sides, each of which has the guide hole drilled in the corner portion, and a second protrusion is formed on the inside of the center portion of the two sides that are parallel to each other. Multiple square ring shapes A component preparation step of preparing second frame base materials and a plurality of heat dissipation fins, and placing the partition base materials, first frame base materials, and second frame base materials in a state in which the four guide pins are arranged to correspond to the guide holes. It is assembled to a guide pin through a guide hole, and the heat dissipation fins are installed inside the first frame base materials and the second frame base materials, and the first frame base material and the second frame base material are arranged alternately between the partition base materials. A stacking step of installing and forming a base material stack, a brazing step of forming a base material block by brazing with a load applied to the top of the base material stack, guide pins of the base material block, both ends of the partition base materials, and a first It includes a cutting step of manufacturing a heat exchanger by cutting both ends of the base material block to remove two parallel sides of the frame base materials and the second frame base material.

According to the solid oxide fuel cell according to an embodiment of the present invention, fluid inlets can be positioned differently between neighboring floors and multiple fluid inlets can be provided between the same floors.

In addition, according to the method of manufacturing a heat exchanger for a solid oxide fuel cell according to an embodiment of the present invention, the laminated parts can be pressed with uniform pressure as a whole, so the joints are joined uniformly as a whole and the dimensional accuracy of the product is improved.

Figure 1 is a perspective view showing a heat exchanger for a solid oxide fuel cell according to an embodiment of the present invention.
Figure 2 is a plan view showing a heat exchanger for a solid oxide fuel cell according to an embodiment of the present invention.
Figure 3 is a plan cross-sectional view showing a heat exchanger for a solid oxide fuel cell according to an embodiment of the present invention.
Figure 4 is a cross-sectional view taken along line AA of Figure 2.
Figure 5 is a cross-sectional view taken along line BB of Figure 2.
Figure 6 is a perspective view showing a heat dissipation fin of a heat exchanger for a solid oxide fuel cell according to an embodiment of the present invention.
Figure 7 is a block diagram showing a method of manufacturing a heat exchanger for a solid oxide fuel cell according to an embodiment of the present invention.
Figure 8 is a perspective view showing a component preparation step in the manufacturing method of a heat exchanger for a solid oxide fuel cell according to an embodiment of the present invention.
Figure 9 is a perspective view showing the stacking step in the manufacturing method of a heat exchanger for a solid oxide fuel cell according to an embodiment of the present invention.
Figure 10 is a perspective view showing a base material stack formed according to a method of manufacturing a heat exchanger for a solid oxide fuel cell according to an embodiment of the present invention.
Figure 11 is a perspective view showing a base material block formed according to a method of manufacturing a heat exchanger for a solid oxide fuel cell according to an embodiment of the present invention.
Figure 12 is a perspective view showing a cutting step in the method of manufacturing a heat exchanger for a solid oxide fuel cell according to an embodiment of the present invention.
Figure 13 is a side view showing a cutting portion of a base material block in the method of manufacturing a heat exchanger for a solid oxide fuel cell according to an embodiment of the present invention.
Figure 14 is a plan view showing a cutting portion of a base material block in the method of manufacturing a heat exchanger for a solid oxide fuel cell according to an embodiment of the present invention.
Figure 15 is a plan view showing a cutting portion of the first frame base material in the method of manufacturing a heat exchanger for a solid oxide fuel cell according to an embodiment of the present invention.
Figure 16 is a plan view showing a cutting portion of the second frame base material in the method of manufacturing a heat exchanger for a solid oxide fuel cell according to an embodiment of the present invention.

Next, a preferred embodiment of the heat exchanger for a solid oxide fuel cell and its manufacturing method according to the present invention will be described in detail with reference to the drawings.

Hereinafter, the same reference numerals will be used for technical elements performing the same function, and repeated detailed descriptions will be omitted to avoid redundant description.

The examples described below are illustrative to effectively demonstrate preferred embodiments of the present invention and should not be construed to limit the scope of the present invention.

As shown in FIGS. 1 to 3, the heat exchanger for a solid oxide fuel cell according to an embodiment of the present invention includes rectangular heat transfer partitions 20 arranged at regular intervals, and between the heat transfer partitions 20. It includes installed frames 40 and heat dissipation fins 60 installed inside the frames 40, respectively.

The heat transfer partitions 20 are made of thin plates.

Here, the heat transfer partitions 20 are preferably made of aluminum plates, copper plates, stainless steel plates, etc., which have good thermal conductivity.

Fluid may be transferred between the heat transfer partitions 20.

A reinforcing frame 21 may be installed on one side of the heat transfer partition 20 located at both ends of the heat transfer partitions 20.

The frames 40 surround the space between the heat transfer partitions 20 with fluid inlets 32 and 34 formed at both ends of the space between the heat transfer partitions 20 for the inflow and outflow of fluid. .

As shown in FIGS. 4 and 5, the frames 40 are first frames installed to form the fluid inlet 32 at the center of both ends of the space between the heat transfer partitions 20. 41) and second frames 50 installed on both sides of the space between the heat transfer partitions 20 to form the fluid inlet 34, respectively.

Here, the first frames 41 and the second frames 50 are installed alternately in the spaces between the heat transfer partitions 20.

The fluid inlets 32 formed at the center of both ends of the space between the heat transfer partitions 20 and the fluid inlets 32 formed on both sides of both ends of the space between the heat transfer partitions 20 are formed in a zigzag pattern. It is formed to be arranged.

The first frames 41 may be installed so that one or more branch walls 34 are further formed to divide the flow path at the fluid inlet 32.

The branch walls 34 are each arranged horizontally during the heat exchanger manufacturing process, and prevent the central portions of both ends of the heat transfer partitions 20, which are arranged in overlapping stages at regular intervals, from sagging due to the fluid inlet 32. It is prevented.

The frames 40, like the partition plates 20, are preferably made of aluminum, copper, or stainless steel with good thermal conductivity, and are integrated with the partition plates 20 through brazing. It is desirable to use a material that can be manufactured.

The heat dissipation fin 60 is manufactured as an integrated piece by joining the heat transfer partitions 20, the first frames 41, and the second frames 50 through brazing.

The heat dissipation fin 60 has a structure that can improve heat exchange efficiency by increasing the contact area (heat exchange area) with the fluid passing through the space between the heat transfer partitions 20.

The heat dissipation fin 60 is made of a thin metal plate with a zigzag cross-section, as shown in FIGS. 3 and 6, for example.

The heat dissipation fin 60 can be implemented in the same configuration as the heat dissipation fin widely used in general heat exchangers.

The heat dissipation fin 60, like the partition plates 20 and the frames 40, is preferably made of aluminum, copper, or stainless steel with good thermal conductivity, and the partition plates 20 and the frames 40 It is preferable to use a material that can be manufactured integrally with the fields 40 through brazing.

The heat exchanger for a solid oxide fuel cell according to an embodiment of the present invention configured as described above allows the fluid passing inside the first frames 41 and the fluid passing inside the second frames 50 to cross each other. Accordingly, it is possible for heat exchange to occur between fluids.

Here, the fluid passing inside the first frames 41 may be a high-temperature combustion gas discharged from the air electrode or anode of the fuel cell stack, and the fluid passing inside the second frames 50 may be a fuel cell. It can be air supplied to the air electrode of the stack or hydrogen gas supplied to the anode of the fuel cell stack. As heat exchange occurs between the combustion gas and air or the combustion gas and hydrogen gas, the heat of the discarded combustion gas is used to produce fuel. Since the air and hydrogen gas supplied to the battery stack can be preheated, energy consumption efficiency can be improved.

Next, a method for manufacturing a solid oxide fuel cell according to an embodiment of the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 7 to 11, the method of manufacturing a solid oxide fuel cell according to an embodiment of the present invention includes guide pins 100, partition base materials 120, first frame base materials 140, and second frame base materials 140. A component preparation step (S10) of preparing frame base materials 150 and heat dissipation fins 160, respectively, and the prepared partition base materials 100, first frame base materials 140, and second frame base materials 150. , a stacking step (S20) of forming a base material stack 200 by stacking the heat dissipation fins 160 in multiple stages under the guidance of the guide fins 100, and brazing the base material stack 200. ), including a brazing step (S30) of forming the base material block 300 and a cutting step (S40) of manufacturing the heat exchanger 400 by cutting the base material block 300. It comes true.

Guide holes 122 are formed at corners of the partition base materials 120, first frame base materials 140, and second frame base materials 150 to be assembled with the guide pin 100.

In the stacking step (S20), four guide pins 100 are placed standing on the floor corresponding to the guide holes 122.

Here, the guide holes 122 are formed at four corners of the partition base material 120, the first frame base material 140, and the second frame base material 150, each of which is formed in a square shape.

The guide pin 100 may be provided with a pin base 102 at the lower end so that it can stand stably on the floor.

The partition base material 120 prepared in the component preparation step (S10) is formed in a square plate shape, and the guide hole 122 is drilled in the corner portion.

The first frame base material 140 is made in the shape of a square ring, the guide hole 122 is drilled in the corner portion, and the first protrusion 142 is formed on the inside of both side portions of the two sides parallel to each other.

The second frame base material 150 has a square ring shape, the guide hole 122 is drilled in the corner, and a second protrusion 152 is formed inside the center of the two sides parallel to each other.

The partition base materials 120, first frame base materials 140, and second frame base materials 150 are assembled to the guide pin 100 through the guide hole 122 in the stacking step (S20). It is installed in multiple layers, and the first frame base material 140 and the second frame base material 150 are installed alternately between the partition base materials 120 to form a base material stack 200. (FIG. 9 and Figure 10)

Here, the heat dissipation fins 160 are installed inside the first frame base materials 140 and the second frame base materials 150.

The partition base material 120, the first frame base material 140, the second frame base material 150, and the heat dissipation fin 160 may be made of aluminum steel, stainless steel, etc. to enable brazing.

The base material stack 200 formed in the stacking step (S20) is brazed with a load applied to the top to form the base material block 300 (see Figure 12).

Here, a block-shaped heavy object 210 is installed on the top of the base material stack 200 so that the load is applied uniformly throughout.

As shown in FIGS. 13 to 16, the base material block 300 formed in the brazing step (S30) includes the guide pins 100, both ends of the partition base materials 120, and the first frame base materials 140. ) and the heat exchanger 400 is manufactured by cutting both ends of the base material block 300 to remove the two parallel sides of the second frame base materials 150.

Here, when both ends of the base material block 300 are cut and removed, the first protruding portion 142 of the first frame base materials 140 and the second protrusion 142 of the second frame base materials 150 are placed in the heat exchanger 400. The protrusion 152 is cut and removed so that part or all of it remains.

In the above, a preferred embodiment of the heat exchanger for a solid oxide fuel cell and its manufacturing method according to an embodiment of the present invention has been described, but the present invention is not limited thereto, and the description and claims of the invention and the scope of the accompanying drawings It is possible to implement various modifications within the scope, and this also falls within the scope of the present invention.

This invention was derived through the 2022 local production technology development support project for hydrogen fuel cell core components supported by Pohang Techno Park, a foundation.

20: Heat partition 21: Reinforcement frame
32, 34: fluid inlet 40: frame
41: first frame 42: branch wall
50: second frame 60: heat dissipation fin
100: Guide pin 102: Pin base
120: Partition base material 122: Guide hole
140: first frame base material 142: first protrusion
150: Second frame base material 152: Second protrusion
160: heat dissipation fin 200: base material stack
210: Heavy material 300: Base material block
400: heat exchanger

Claims (7)

Heat partitions arranged at regular intervals,
Frames installed to surround the space between the heat partitions, with fluid inlets and inlets for the inflow and outflow of fluid formed at both ends of the space between the heat partitions;
Includes heat dissipation fins installed inside each of the frames and exchanging heat while contacting fluid passing through the frames,
The frames are,
First frames are installed to form the fluid inlet at central portions of both ends of the space between the heat partitions, respectively, and are installed to form the fluid inlet to both sides of both ends of the space between the heat partitions, respectively. It consists of second frames that are,
A heat exchanger for a solid oxide fuel cell, characterized in that the first frames and the second frames are installed alternately in the space between the heat transfer partitions. In claim 1,
A heat exchanger for a solid oxide fuel cell, wherein heat exchange occurs between the fluid passing inside the first frames and the fluid passing inside the second frames. In claim 2,
The fluid passing inside the first frames is combustion gas,
A heat exchanger for a solid oxide fuel cell, characterized in that the fluid passing inside the second frames is air. In claim 1,
A solid oxide characterized in that the fluid inlets and inlets formed in the central portion of both ends of the space between the heat transfer partitions and the fluid inlets and fluid inlets formed in both sides of both ends of the space between the heat transfer partitions are arranged in a zigzag pattern. Heat exchanger for fuel cells. A plurality of guide pins, a plurality of square plate-shaped partition base materials each having guide holes drilled in the corners, each having the guide holes drilled in the corners and first protrusions formed on the inside of both side portions of the two sides parallel to each other. A plurality of square ring-shaped first frame base materials, each having the guide hole drilled in a corner portion and a second protrusion formed inside the center portion of two sides parallel to each other. A component preparation step of preparing second frame base materials and a plurality of heat dissipation fins, respectively,
With the four guide pins arranged to correspond to the guide holes, the partition base materials, first frame base materials, and second frame base materials are assembled to the guide pins through the guide holes, while the first frame base materials and the second frame base materials are assembled to the guide pins. A stacking step of installing the heat dissipation fins on the inside of the frame base materials, and installing the first frame base material and the second frame base material alternately between the partition base materials to form a base material stack;
A brazing step of forming a base material block by brazing with a load applied to the upper part of the base material stack;
A cutting step of manufacturing a heat exchanger by cutting both ends of the base material block to remove the guide pins of the base material block, both ends of the partition base materials, and the two parallel sides of the first frame base materials and the second frame base materials.
A method of manufacturing a heat exchanger for a solid oxide fuel cell comprising a. In claim 5,
A method of manufacturing a heat exchanger for a solid oxide fuel cell in which a load is applied to the base material stack by placing a block-shaped heavy object on top. In claim 5,
A method of manufacturing a heat exchanger for a solid oxide fuel cell in which both ends of the base material block are cut and removed so that part or all of the first protrusions of the first frame base materials and the second protrusions of the second frame base materials remain in the heat exchanger. .