KR20170022740A - Apparatus for collecting waste heat - Google Patents

Apparatus for collecting waste heat Download PDF

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Publication number
KR20170022740A
KR20170022740A KR1020150118123A KR20150118123A KR20170022740A KR 20170022740 A KR20170022740 A KR 20170022740A KR 1020150118123 A KR1020150118123 A KR 1020150118123A KR 20150118123 A KR20150118123 A KR 20150118123A KR 20170022740 A KR20170022740 A KR 20170022740A
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KR
South Korea
Prior art keywords
heat
heat absorbing
radiating
endothermic
combustion gas
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Application number
KR1020150118123A
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Korean (ko)
Inventor
이동현
이근택
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(주)나노테크
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Priority to KR1020150118123A priority Critical patent/KR20170022740A/en
Publication of KR20170022740A publication Critical patent/KR20170022740A/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
    • H02N11/00—Generators or motors not provided for elsewhere; Alleged perpetua mobilia obtained by electric or magnetic means
    • H02N11/002—Generators
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/14—Combined heat and power generation [CHP]

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  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)

Abstract

According to an embodiment of the present invention, a waste heat collection apparatus comprises: a housing in which an inlet through which a combustion gas is introduced, an outlet through which the combustion gas is discharged, and an inner space communicating with the inlet and the outlet are formed; a plurality of heat absorption pins installed in the housing, and arranged in parallel with a moving direction of the combustion gas; and a thermoelectric power generation element having a high temperature surface being in contact with the heat absorption pins.

Description

[0001] APPARATUS FOR COLLECTING WASTE HEAT [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a waste heat collecting apparatus, and more particularly, to a waste heat collecting apparatus that absorbs heat from a combustion gas to generate electricity.

The Seebeck effect is a thermoelectric phenomenon that causes current to flow in the closed circuit connecting the two metals or semiconductors when they cause a temperature difference between two metals or semiconductors. In 1821, It was discovered using bismuth.

Particularly, there is a thermoelectric device (TED) as a semiconductor using the above-mentioned Hebeck effect. If a temperature difference is applied to both sides of the thermoelectric device, an electromotive force is generated. Since the energy generation efficiency of the thermoelectric power generation is proportional to the temperature difference between the heat source and the cooling part, energy generation efficiency is not high when the temperature difference between the both ends is not large, and there is a problem that extra energy may be required to form a condition with a large temperature difference .

Korean Unexamined Patent Application Publication No. 2005-0049708 (2005.05.27.)

An object of the present invention is to provide a waste heat collecting apparatus capable of generating heat by absorbing heat from a combustion gas.

Another object of the present invention is to provide a waste heat collecting apparatus capable of efficiently absorbing heat when a combustion gas moves.

Other objects of the present invention will become more apparent from the following detailed description and the accompanying drawings.

According to an embodiment of the present invention, a waste heat collecting apparatus includes a housing having an inlet through which a combustion gas flows, an outlet through which the combustion gas flows, and an inner space communicating with the inlet and the outlet; A plurality of heat-absorbing fins provided in the housing and arranged in parallel with a moving direction of the combustion gas; And a thermoelectric power generator having a high temperature surface in contact with the heat absorbing fin.

The inlet and the outlet may be located on opposite sides of the center of the housing.

Wherein the heat absorbing fin includes a plurality of heat absorbing openings extending in a direction parallel to a moving direction of the combustion gas and spaced apart in the longitudinal direction and the width direction; And first and second endothermic protrusions respectively located on the endothermic opening and protruding from one surface and the other surface of the endothermic plate respectively and having first and second endothermic communication ports communicating with the endothermic opening, , The first and second endothermic protrusions may be alternately disposed along the longitudinal direction and the width direction of the heat absorbing plate.

The heat absorbing fins may include first and second heat absorbing fins disposed in parallel with each other, and the heat absorbing opening of the first heat absorbing fin may be located between the heat absorbing openings of the second heat absorbing plate.

The heat collecting device includes a plurality of heat dissipating fins that are in contact with a low temperature surface of the thermoelectric power generator, the heat dissipating fin includes a plurality of heat dissipating openings extending in one direction and spaced apart in the longitudinal direction and the width direction; And first and second radiating protrusions respectively disposed on the radiating opening and protruding from one surface and the other surface of the radiating plate and having first and second radiating openings communicating with the radiating opening, The first and second heat dissipating protrusions may be alternately disposed along the longitudinal direction and the width direction of the heat dissipation plate.

According to an embodiment of the present invention, heat is absorbed from the combustion gas through one side of the thermoelectric generator, and the other side of the thermoelectric generator is forcedly cooled through natural cooling or blower to generate electricity through a temperature difference, It is possible to minimize energy loss due to discharge into the atmosphere. In addition, it is possible to efficiently absorb heat from the combustion gas during the movement of the combustion gas, thereby increasing the power generation efficiency.

1 is a block diagram schematically illustrating a waste heat collecting apparatus installed in a boiler and a boiler according to an embodiment of the present invention.
Fig. 2 is a cross-sectional view schematically showing the power generating unit shown in Fig. 1. Fig.
3 is a cross-sectional view showing a heat absorbing fin provided in the connection line shown in Fig.
4 and 5 are cross-sectional views schematically showing a modified example of the power generating unit shown in Fig.
Fig. 6 is a partial perspective view showing the heat absorbing fin shown in Figs. 3 and 5. Fig.
7 is a cross-sectional view schematically showing another modification of the power generating unit shown in Fig.
8 is a cross-sectional view showing modifications of the heat absorbing fin shown in Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments of the present invention can be modified in various forms, and the scope of the present invention should not be construed as being limited to the embodiments described below. The embodiments are provided to explain the present invention to a person having ordinary skill in the art to which the present invention belongs. Accordingly, the shape of each element shown in the drawings may be exaggerated to emphasize a clearer description.

1 is a block diagram schematically illustrating a waste heat collecting apparatus installed in a boiler and a boiler according to an embodiment of the present invention. As shown in Fig. 1, the boiler 10 burns fuel through a combustion device, heats the medium through heat generated during combustion, and the heated medium is introduced into a desired place (for example, Pipe, etc.) to raise the temperature.

The combustion apparatus 14 burns the fuel (for example, gas, etc.) supplied from the outside, and the fuel can be supplied to the combustion apparatus 14 while being mixed with air or the like. The blower 16 supplies the fuel mixed with the air to the combustion device 14. [

The combustion apparatus 14 burns fuel to generate heat, and the generated heat is transferred to the medium in the heat exchanger 12. [ That is, the medium passes through the heat exchanger 12, and the heat generated in the combustion device 14 is transferred to the medium passing through the heat exchanger 12, so that the temperature of the medium rises. The combustion device 14 can be installed inside the heat exchanger 12 to heat the medium. Alternatively, the combustion device 14 generates hot air in a state where the combustion device 14 is installed outside the heat exchanger 12, The medium can be heated in such a manner that hot air is supplied to the heat exchanger 12. [

On the other hand, the medium heated in the heat exchanger 12 is discharged to the outside of the heat exchanger 12, and the discharged medium is forcedly supplied to the desired place through the pump 17. The controller 18 is connected to the combustion device 14 and the blower 16 to adjust the amount of fuel mixed with the air and the ignition timing of the combustion device 14. [ Further, the controller 18 adjusts the output of the pump 17 to adjust the supply amount or the supply speed of the medium.

The power generation unit 100 generates electricity using waste heat discharged from the heat exchanger 12, and the generated electricity can be stored in the battery 200 or supplied to a place where electricity is required. That is, combustion gas is generated when the fuel is burned in the combustion device 14, and since the combustion gas has a high temperature of 60 to 500 ° C. and has sufficient heat energy, energy loss is worried when the combustion gas is directly discharged into the air .

Particularly, since the combustion gas is in a gaseous state, it has a low specific heat and a high moving speed, so that it can not efficiently heat the medium in the heat exchanger 12. Accordingly, the power generation unit 100 is installed between the discharge line 22 and the discharge line 24 from which the combustion gas is discharged, and the energy efficiency is greatly improved by generating electricity through the combustion gas. 1 shows that the discharge lines 22 and 24 are connected to the heat exchanger 12 but this is a case where the combustion gas is discharged after the heat exchange with the medium is performed in the heat exchanger 12 Alternatively, the discharge lines 22 and 24 may be connected directly to the combustion device 14 when the combustion gas is discharged directly from the combustion device 14. [

Fig. 2 is a cross-sectional view schematically showing the power generating unit shown in Fig. 1, and Fig. 3 is a cross-sectional view showing a heat absorbing fin provided in the connecting line shown in Fig. The waste heat collecting apparatus includes a power generation unit (100).

2, the power generation unit 100 includes a housing 120, a heat absorbing fin 150, and a thermoelectric generator 200. [ The housing 120 may be in the shape of a rectangular parallelepiped having an internal space and the rear discharge line 22 is connected through the left side of the bottom surface (reference in FIG. 2) and the front discharge line 24 is connected to the ceiling front side Standard). The connecting line 23 is located between the rear discharge line 22 and the front discharge line 24 and connects them together. Thus, the exhausted combustion gas flows along the rear discharge line 22 and flows to the front discharge line 24 through the connecting line 23.

3, the heat absorbing fin 150 is installed in the connecting line 23 and can absorb heat from the combustion gas and can transmit the heat to the thermoelectric generator 200 to be described later through the outer peripheral surface of the connecting line 23. [ have. Therefore, the heat absorbing fin 150 may be made of a material such as aluminum or copper having a high heat transfer coefficient.

3, the heat absorbing fin 150 is disposed to be substantially parallel to the longitudinal direction of the connecting line 23 or the moving direction of the combustion gas, and the plurality of heat absorbing fins 150 are arranged in the width direction of the housing 120 And can be stacked. The combustion gas flows along the surface of the heat absorbing fins 150, and the heat of the combustion gas is transferred to the heat absorbing fins 150 in this process. 3, the heat absorbing fin 150 may be disposed so as to be substantially perpendicular to the longitudinal direction of the connecting line 23 or the moving direction of the combustion gas. The specific shape of the heat absorbing fin 150 will be described later.

The thermoelectric generator 200 is installed on the outer circumferential surface of the connecting line 23 (the upper surface or the lower surface with reference to FIG. 2), and the high temperature surface of the thermoelectric generator 200 is connected to the outer circumferential surface (Not shown). In addition, the heat transfer plate 160 may be in thermal contact with the low temperature side of the thermoelectric generator 200, and the heat transfer plate 160 may be made of a copper material having a high heat transfer coefficient. The radiating fins 170 are in thermal contact with the heat transfer plate 160, and the radiating fins 170 absorb and discharge heat from the heat transfer plate 160. Therefore, the low temperature surface of the thermoelectric generator 200 can be cooled through the heat transfer plate 160 and the radiating fins 170. The specific structure and function of the heat dissipation fin 170 generally correspond to the structure and function of the heat dissipation fin 150 and can be arranged in the same manner as the heat dissipation fin 150. [

The cooling fan 230 is installed on one side of the radiating fin 170 to forcibly cool the radiating fin 170. The housing 120 has one or more inlets 212 formed on the left side (with reference to FIG. 2) and one or more outlets 214 formed on the right side (with reference to FIG. 2) Air flows into the housing 120 through the inlet 212 and then flows toward the radiating fin 170 to force the cooling fin 170 to be cooled and then discharged to the outside of the housing 120 through the outlet 214 . The housing 120 has a plurality of vent holes 122 formed in the top and bottom surfaces of the housing 120. The outside air is introduced into or introduced into the housing 120 through the vent holes 122, As shown in FIG. At this time, the cooling fan 230 can operate by receiving the electricity generated from the thermoelectric generator 200.

As described above, the thermoelectric generator 200 includes a plurality of N-type semiconductors and P-type semiconductors disposed therein, and a device using a Seebeck effect that performs thermoelectric power generation using a temperature difference between a high temperature surface and a low temperature surface to be. The high temperature surface of the thermoelectric generator 200 is heated or heated through the heat absorbing fins 150. The low temperature surface of the thermoelectric generator 200 is naturally cooled through the heat radiating fins 170, Can be cooled.

Particularly, the thermoelectric power generating device 200 can obtain higher power generation efficiency as the temperature difference between the high temperature surface and the low temperature surface becomes larger, the Seebeck coefficient becomes larger, and the electrical resistance becomes smaller. In order to increase the temperature difference between the high temperature surface and the low temperature surface, the temperature of the high temperature surface must be increased or the temperature of the low temperature surface must be decreased. If the temperature of the high temperature surface is increased, the efficiency of the boiler 10 is lowered. It is preferable to reduce the temperature of the surface.

Reducing the temperature of the low temperature surface means increasing the cooling efficiency of the low temperature surface. Therefore, as shown in FIG. 2, a plurality of radiating fins 170 may be provided on the low temperature surface of the thermoelectric generator 200 to increase the cooling efficiency of the low temperature surface.

The heat insulating member 220 is installed so as to surround the rear discharge line 22 and the front discharge line 24 so that the combustion gas and the thermoelectric element 200 are heated It is possible to prevent a loss from occurring. Particularly, since the combustion gas in the rear discharge line 22 is not heat-exchanged with the thermoelectric generator 200, it is necessary to prevent heat loss as much as possible.

4 and 5 are cross-sectional views schematically showing a modified example of the power generating unit shown in Fig. The waste heat collecting apparatus includes a power generation unit 100 and a battery 200. As described above, electricity generated by the power generation unit 100 can be stored in the battery 200. [

The power generation unit 100 includes a housing 120 and a heat absorbing fin 150, and a thermoelectric generator 200. The housing 120 may have a rectangular parallelepiped shape having an inner space and may have an inlet 22a formed on one side and an outlet 24a formed on the other side. The inlet 22a is formed on the right side of the bottom surface (referring to Fig. 2) of the housing 120 and is connected to the rear discharge line 22. The outlet 24a is formed below the left side of the housing 120 (referring to FIG. 2), and is connected to the front discharge line 24. Thus, the exhausted combustion gas flows along the rear discharge line 22, flows into the interior of the housing 120 through the inlet 22a, flows out through the outlet 24a, and flows along the front discharge line 24.

The heat absorbing fin 150 is installed on the movement path of the combustion gas flowing through the inlet 22a and flowing toward the outlet 24a so as to absorb the heat from the combustion gas and transmit the heat to the thermoelectric generator 200 . Therefore, the heat absorbing fin 150 may be made of aluminum or the like having a high heat transfer coefficient.

5, the endothermic fins 150 are arranged to be substantially parallel to the longitudinal direction of the housing 120 or the direction of movement of the combustion gas, and a plurality of heat absorbing fins 150 are disposed in the width direction of the housing 120 And then stacked. The combustion gas flows along the surface of the heat absorbing fins 150, and the heat of the combustion gas is transferred to the heat absorbing fins 150 in this process. On the other hand, the heat absorbing fin 150 may be disposed so as to be substantially perpendicular to the longitudinal direction of the housing 12 or the direction of movement of the combustion gas.

Fig. 6 is a partial perspective view showing the heat absorbing fin shown in Figs. 3 and 5. Fig. 6, the heat absorbing fin 150 includes a heat absorbing plate 152 having a rectangular flat plate shape. The heat absorbing plate 152 includes a plurality of heat absorbing plates 152 spaced apart in a lattice form along the longitudinal direction and the width direction And has heat absorbing openings (157). The heat absorbing protrusions 154 and 156 are disposed on the heat absorbing opening 157 and protrude from the surface of the heat absorbing plate 152 to increase the surface area of the heat absorbing fin 150.

Specifically, the first endothermic protrusion 154 protrudes from one surface of the heat absorbing plate 152, and the second heat absorbing protrusion 156 protrudes from the other surface of the heat absorbing plate 152. 4, the first and second endothermic protrusions 154 and 156 are disposed in a direction opposite to the length of the heat absorbing plate 152. That is, the first endothermic projection 154 and the second endothermic projection 156 protrude in opposite directions, Direction and the width direction. The first and second endothermic protrusions 156 have first and second endothermic communication ports communicating with the heat-absorbing opening 157, respectively.

The first and second endothermic protrusions 154 and 156 may be formed through a deep drawing process through a press. That is, when the endothermic plate 152 is pressed using a punch (not shown) and a die (not shown), a part of the endothermic plate 152 is cut, and a heat absorbing opening 157 is formed in the heat absorbing plate 152, A part of the heat-absorbing plate 152 may be one of the first and second heat absorbing protrusions 154 and 156 according to the pressing direction.

5, the heat absorbing openings 157 of the heat absorbing fin 150 are disposed between the heat absorbing openings 157 of the other heat absorbing fins 150, with the heat absorbing fins 150 stacked side by side. As described above, the combustion gas introduced through the inlet 22a flows not only toward the outlet 24a along the surface of the heat absorbing fin 150 but also flows through the heat absorbing opening 157 and the heat absorbing communication hole to the heat absorbing plate 152 And the heat of the combustion gas can be sufficiently transferred to the heat absorbing fins 150 in this process.

The thermoelectric generator 200 is installed in the housing 120 and the high temperature surface (or the lower surface) of the thermoelectric generator 200 is in thermal contact with the heat absorbing fins 150. The thermal contact does not necessarily mean that the thermoelectric generator 200 and the heat absorbing fins 150 are physically in direct contact with each other and even if there is another structure between the thermoelectric generator 200 and the heat absorbing fins 150, (heat transfer) is possible. For example, when only the heat absorbing fins 150 are installed in the housing 120, the upper end of the heat absorbing fins 150 physically contacts the inside of the upper surface of the housing 120 and the thermoelectric generator 200 contacts the housing 120 ), So that heat exchange can be made between them. In this case, the heat absorbed through the heat absorbing fins 15 is transmitted to the high temperature surface of the thermoelectric generator 200. Since the upper surface of the housing 120 facing the low temperature surface (or the upper surface) of the thermoelectric generator 200 has a plurality of vent holes 122, the low temperature surface of the thermoelectric generator 200 is connected to the vent 122 Or through a separate blower (not shown) installed on the vent 122. At this time, the blower can operate by receiving the electricity generated from the thermoelectric generator 200.

As described above, the thermoelectric generator 200 includes a plurality of N-type semiconductors and P-type semiconductors disposed therein, and a device using a Seebeck effect that performs thermoelectric power generation using a temperature difference between a high temperature surface and a low temperature surface to be. The high temperature surface of the thermoelectric generator 200 is heated or heated through the heat absorbing fins 150 and the low temperature surface of the thermoelectric generator 200 is cooled naturally through the vent hole 122, And can be forcedly cooled through a blower (not shown).

7 is a cross-sectional view schematically showing another modification of the power generating unit shown in Fig. On the other hand, in the thermoelectric device 200, the higher the temperature difference between the high temperature surface and the low temperature surface, the larger the Seebeck coefficient, and the smaller the electrical resistance, the higher the power generation efficiency. In order to increase the temperature difference between the high temperature surface and the low temperature surface, the temperature of the high temperature surface must be increased or the temperature of the low temperature surface must be decreased. If the temperature of the high temperature surface is increased, the efficiency of the boiler 10 is lowered. It is preferable to reduce the temperature of the surface.

Reducing the temperature of the low temperature surface means increasing the cooling efficiency of the low temperature surface. Therefore, as shown in FIG. 7, the plurality of radiating fins 170 can be provided on the low temperature surface of the thermoelectric generator 200, thereby increasing the cooling efficiency of the low temperature surface.

The radiating fins 170 may be brought into contact with the low temperature surface of the thermoelectric generator 200 to lower the temperature of the low temperature surface to a level substantially equal to the room temperature. The radiating fins 170 may be naturally cooled or a separate blower ). ≪ / RTI > At this time, the upper portion of the housing 120 may be opened, and the radiating fins 170 may contact the thermoelectric generator 200 through the opened upper portion of the housing 120. Since the specific structure and function of the heat dissipation fin 170 are substantially the same as the structure and function of the heat dissipation fin 150, a detailed description thereof will be omitted.

Although the present invention has been described in detail by way of preferred embodiments thereof, other forms of embodiment are possible. Therefore, the technical idea and scope of the claims set forth below are not limited to the preferred embodiments.

10: Boiler
12: Heat exchanger
14: Combustion device
16: blower
17: Pump
18:
22: rear discharge line
24: front discharge line
120: Housing
122: Vents
150: heat sink pin
152: endothermic plate
154,156: endothermic projection
170:

Claims (5)

A housing having an inlet through which the combustion gas flows, an outlet through which the combustion gas flows out, and an inner space communicating with the inlet and the outlet;
A plurality of heat absorbing fins provided in the housing; And
And a thermoelectric power generator having a high temperature surface in contact with the heat absorbing fin. The method according to claim 1,
Wherein the inlet port and the outlet port are located on the opposite sides with respect to the center of the housing. The method according to claim 1,
The heat-
An endothermic plate extending in a direction parallel to the direction of movement of the combustion gas, the endothermic plate having a plurality of heat absorbing openings spaced apart in the longitudinal direction and the width direction; And
And first and second endothermic protrusions respectively located on the endothermic opening and protruding from one surface and the other surface of the endothermic plate respectively and having first and second endothermic communication ports communicating with the endothermic opening,
Wherein the first and second heat absorbing protrusions are alternately arranged along the longitudinal direction and the width direction of the heat absorbing plate. The method of claim 3,
Wherein the heat absorbing fins include first and second heat absorbing fins disposed in parallel with each other,
And the heat absorbing opening of the first heat absorbing fin is located between the heat absorbing openings of the second heat absorbing plate. The method according to claim 1,
In the waste heat collecting apparatus,
And a plurality of heat dissipating fins that come into contact with a low temperature surface of the thermoelectric power generator,
The heat-
A heat radiating plate extending in one direction and having a plurality of heat radiating openings spaced apart along the longitudinal direction and the width direction; And
And first and second radiating protrusions respectively disposed on the radiating opening and protruding from one surface and the other surface of the radiating plate respectively and having first and second radiating openings communicating with the radiating opening,
Wherein the first and second radiating protrusions are alternately disposed along the longitudinal direction and the width direction of the heat radiating plate.
KR1020150118123A 2015-08-21 2015-08-21 Apparatus for collecting waste heat KR20170022740A (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050049708A1 (en) 2000-04-04 2005-03-03 Atkinson Robert E. Devices and methods for the treatment of spinal disorders

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050049708A1 (en) 2000-04-04 2005-03-03 Atkinson Robert E. Devices and methods for the treatment of spinal disorders

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