JP2011192759A - Thermoelectric generation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermoelectric generation system with a large power generation amount without occurrence of uneven contact even if there is variation in thickness of a thermoelectric conversion module, and without a damage in the thermoelectric conversion module even if a tightening force is increased, because waste heat of a comparatively low temperature region is collected. <P>SOLUTION: The thermoelectric generation system has a plurality of thermoelectric conversion units 5 and 5A which are fitted to pipings 6 and 7 where mediums 6a and 7a flow and thermoelectrically convert heat which the mediums hold so as to generate power. Each of thermoelectric conversion unit 5 and 5A includes the thermoelectric conversion module 2 having thermoelectric conversion materials 21 and 22 and a pair of insulating plates 23 sandwiching the thermoelectric conversion material, a pair of plate-like conductive metals 3 and 3A sandwiching the thermoelectric conversion module from outside the insulating plates, and an insulating mold material 4 where a part of the conductive metals and the thermoelectric generation element are embedded so that one face of the conductive metal is exposed for integrally unitizing the thermoelectric conversion module and the conductive metal. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a thermoelectric power generation system that recovers energy by directly converting thermal energy of exhaust gas flowing through a pipe into electrical energy.

  Efforts to reduce the environmental burden from the perspective of preventing global warming have been made in various areas, and heat recovery technology that attempts to effectively utilize unused energy in the relatively low temperature range that was previously released directly into the environment Development is underway. In particular, an enormous amount of heat energy is discarded in a relatively low temperature range where the exhaust heat temperature is 150 ° C. or less. For example, the exhaust heat temperature discharged from substations and subway stations is as low as 40 to 80 ° C., and no effective energy recovery technology has been established.

  From such a background, a method using a thermoelectric conversion module has been studied as one of techniques for recovering heat generated in various devices and industrial plants. For example, in the thermoelectric conversion devices described in Patent Documents 1 and 2, a plurality of thermoelectric conversion modules are installed between high-temperature pipes and low-temperature pipes, and high-temperature water generated in equipment and industrial plants is allowed to flow through the high-temperature pipes. It has been proposed to generate water by flowing water through a cold pipe and using the temperature difference. In these thermoelectric conversion apparatuses, in order to increase the power generation efficiency, the thermoelectric conversion module is mechanically tightened in order to increase the heat transfer rate from the pipe to the thermoelectric conversion module.

JP 2006-210568 A JP 2008-98403 A

  However, in the conventional thermoelectric conversion device, in order to increase the heat transfer rate from the heat source unit to the thermoelectric conversion module, it is generally performed to increase the clamping force of the thermoelectric conversion module. When using multiple thermoelectric conversion modules due to variations in the height of the modules, the performance of the thermoelectric conversion module cannot be fully exploited due to the impact caused by the variation in height, and the thermoelectric conversion efficiency Is low. Here, if the tightening force is increased in an attempt to improve heat transfer from the heat source unit to the thermoelectric conversion module, the thermoelectric conversion module may be damaged.

  The present invention has been made in order to solve the above-described problem, and in order to recover exhaust heat in a relatively low temperature range, even if the thickness of the thermoelectric conversion module varies, there is no contact between the two. An object of the present invention is to provide a thermoelectric power generation system that generates a large amount of power without causing damage to the thermoelectric conversion module even if the tightening force is increased.

  The thermoelectric power generation system of the present invention is a thermoelectric power generation system that is attached to a pipe through which a medium flows and has a plurality of thermoelectric conversion units that generate electricity by thermoelectrically converting the heat held by the medium. A thermoelectric conversion module having a conversion material and a pair of insulating plates that sandwich the thermoelectric conversion material, a pair of plate-like conductive metals that sandwich the thermoelectric conversion module from the outside of the insulating plate, and one side of the conductive metal It has an insulating mold material in which a part of the conductive metal and the thermoelectric conversion module are embedded so as to be exposed.

  According to the present invention, since all of the conductive metal and the thermoelectric conversion module other than the exposed surface that contacts the pipe are embedded in the insulating mold material, even if there is a variation in thickness between the thermoelectric conversion modules, Thus, there is provided a thermoelectric power generation system in which the surface of a pipe such as a heat medium transport pipe does not come into contact with one another, and even if the tightening force is increased, the thermoelectric conversion module is not damaged and the power generation amount is large.

The cross-sectional schematic diagram which shows the thermoelectric power generation system which concerns on embodiment of this invention. Sectional drawing which expands and shows the thermoelectric conversion unit used for the system of FIG. FIG. 3 is a cross-sectional view of a main part of the thermoelectric conversion module of FIG. 2. The characteristic diagram which shows the temperature dependence of the performance of various thermoelectric conversion elements. The cross-sectional schematic diagram which shows the thermoelectric power generation system which concerns on other embodiment of this invention. Sectional drawing which expands and shows the thermoelectric conversion unit used for the system of FIG.

  Various preferred embodiments of the present invention will be described.

  (1) The thermoelectric power generation system according to the present invention is a thermoelectric power generation system that includes a plurality of thermoelectric conversion units that are attached to a pipe through which a medium flows and thermoelectrically convert heat held by the medium to generate electric power. Includes a thermoelectric conversion material and a thermoelectric conversion module having a pair of insulating plates that sandwich the thermoelectric conversion material, a pair of plate-like conductive metals that sandwich the thermoelectric conversion module from the outside of the insulating plates, and the conductive metal A part of the conductive metal and an insulating mold material in which the thermoelectric conversion module is embedded so that one surface of the conductive metal is exposed.

  In the present invention, since the thermoelectric conversion module and a part of the conductive metal are embedded in the insulating mold material, one side where the conductive metal is exposed is the outer surface of the pipe in a state where both are unitized. Since it can be attached to the pipe so as to be in contact with each other, even if there is a variation in the thickness of the thermoelectric conversion module, there is no occurrence of a piece contact where only a part of the conductive metal is biased and in contact with the outer surface of the pipe. Further, in the present invention, the conductive metal comes into contact with the outer surface of the pipe evenly without contacting each other, so that even if the tightening force is increased, the thermoelectric conversion module is hardly damaged. For example, the insulating plate is less likely to be broken or broken.

  (2) In the above (1), the conductive metal has a conductive metal plate having an exposed surface on which at least one surface is exposed, and further includes a plurality of fins protruding outward from the exposed surface of the conductive metal plate. It is preferable to have. In the present invention, since the reaction heat transferred to the conductive metal plate through the plurality of fins can be released to the outside, the heat dissipation as the entire conductive metal is improved.

  (3) In said (2), it is preferable that the surface of the said conductive metal plate is larger than the surface of the said insulating plate in the surface where a conductive metal plate and the insulating plate of a thermoelectric conversion module mutually contact. Since the insulating plate of the thermoelectric conversion module is made of a brittle material such as ceramic, the corners and edges of the insulating plate are likely to be chipped. However, in the present invention, since the surface of the conductive metal plate is larger than the surface of the insulating plate at the mutual contact surface between the conductive metal plate and the insulating plate, local stress concentration occurs at the peripheral edge of the insulating plate. Even if it does not occur or occurs, the local stress is reduced, and the corners and edges of the insulating plate are not lost. In this case, it is desirable that the insulating plate is positioned 0.5 mm or more inside the conductive metal plate at the mutual contact surface between the insulating plate and the conductive metal plate of the thermoelectric conversion module (FIGS. 2 and 6). This is because if the surface of the insulating plate is positioned 0.5 mm or more inward from the surface of the conductive metal plate, local stress concentration is less likely to occur at the corners and edge portions of the insulating plate.

  (4) In any one of the above (1) to (3), the main component of the thermoelectric conversion material is preferably composed of bismuth and tellurium. Silicon-germanium (Si-Ge) and lanthanum-tellurium (La-Te) materials have excellent thermoelectric conversion performance in the high temperature range of 900 ° C. or higher, and lead-tellurium (Pb-Te) in the intermediate temperature range of 400 to 600 ° C. ) System materials are excellent in thermoelectric conversion performance, and bismuth-tellurium (Bi-Te) system materials are excellent in thermoelectric conversion performance in a low temperature range of 150 ° C. (FIG. 4). In the present invention, the thermoelectric conversion module having a bismuth-tellurium (Bi-Te) -based material is the most popular because it aims to recover the thermal energy of a heat medium such as exhaust gas discarded at a low temperature of 150 ° C. or lower. Is suitable.

  (5) In any one of the above (1) to (4), it is preferable that the medium is a fluid of water, insulating oil, or silicone. With the thermoelectric power generation system of the present invention, the heat possessed by a medium such as hot water at a hot spring resort or insulating oil used in a generator is recovered. The system of the present invention can target not only these liquid fluids but also gases and gas-liquid mixtures as a medium. That is, it is possible to generate power with the thermoelectric power generation system of the present invention by using combustion exhaust gas from a garbage incineration plant, exhaust gas from a cleaning plant, exhaust gas from an oil refinery, or the like as a heat source.

  (6) One or more metal materials selected from the group consisting of carbon steel, stainless steel, aluminum, aluminum alloy, titanium, and titanium alloy in any of (1) to (5) above Preferably it consists of. The material of the piping through which the medium flows is required to have high thermal conductivity in order to improve heat recovery efficiency and excellent durability (corrosion resistance, weather resistance) in order to be maintenance-free. As such a piping material, metal materials such as carbon steel, stainless steel, aluminum, aluminum alloy, titanium and titanium alloy are suitable.

  (7) In any one of the above (1) to (6), the conductive metal plate may be made of one or more metal materials selected from the group consisting of copper, copper alloy, aluminum, and aluminum alloy. preferable. The material of the conductive metal plate is required to have a high thermal conductivity. Suitable materials for such conductive metal plates include copper, copper alloys, aluminum and aluminum alloys.

  (8) In any one of the above (1) to (7), the insulating mold material is preferably an epoxy resin. Epoxy resins have excellent electrical insulation properties, high adhesive strength, and excellent weather resistance, and are most suitable as materials for insulating mold materials.

  (9) In any one of the above (1) to (8), it is preferable that the insulating mold material is a composite material including an epoxy resin and an inorganic material. By adding and mixing an inorganic material having high thermal conductivity into the epoxy resin, the hardness and residual stress of the molding material can be adjusted.

  (10) In any one of the above (1) to (9), the inorganic material in the insulating mold material is preferably one or more selected from the group consisting of alumina particles and silica particles. By adding alumina particles and / or silica particles, the hardness and residual stress of the insulating mold material can be adjusted.

  These inorganic material particles are preferably added so that the content is in the range of 3.0 to 30.0% by volume with respect to the entire insulating mold material (or epoxy resin). This is because when the content of the inorganic material particles exceeds 30.0% by volume, the adhesiveness (bondability) of the epoxy resin is impaired and the inorganic material particles are easily peeled off. On the other hand, when the content of the inorganic material particles is less than 3.0% by volume, the effect of addition becomes insufficient.

  Moreover, it is preferable to make the average particle diameter of an inorganic material particle into the range of 1-80 micrometers. This is because when the average particle size of the particles is less than 1 μm, the dispersibility of the particles is deteriorated. On the other hand, when the average particle diameter of the particles exceeds 80 μm, the adhesiveness of the resin is hindered.

  Hereinafter, preferred embodiments for carrying out the present invention will be described with reference to the accompanying drawings.

(First embodiment)
The thermoelectric power generation system according to the first embodiment will be described with reference to FIGS.

  In the thermoelectric power generation system 1 of the present embodiment, as shown in FIG. 1, the high temperature pipe 6 and the cold temperature pipe 7 are arranged horizontally and in parallel, and a plurality of spacers (not shown) are provided between the pipes 6 and 7. The thermoelectric conversion units 5 are respectively inserted between the pipes 6 and 7 in a state in which the pipes 6 and 7 are kept at a constant distance and are attached at a pitch interval. The thermoelectric conversion unit 5 is disposed between the pipes 6 and 7 so that an exposed surface of a conductive metal described later is in close contact with the outer peripheral surfaces of the pipes 6 and 7 in a surface contact state.

  The necessary number of thermoelectric conversion units 5 is adjusted as appropriate according to the amount of power generation desired. When the thermoelectric conversion unit 5 is attached to the pipes 6 and 7, the thermoelectric conversion unit is such that the exposed surfaces of the conductive metal plates 31 are parallel in the vertical direction and that the total number of the thermoelectric conversion units 5 to be used is the same height. After the conductive metal plate 31 is machined, it is attached to the pipes 6 and 7.

  Although not shown in the figure, because the generated electricity is direct current, a combination of a thermoelectric power generation system, inverter, controller, power conditioner, battery, and capacitor is used to convert direct current to alternating current. Is used. Depending on the application, the obtained direct current electricity may be used as it is. That is, the positive terminals and the negative terminals of the plurality of thermoelectric conversion units 5 are sequentially connected in series by a wiring (not shown), and further connected to a DC-AC conversion inverter by an output wiring (not shown), and the inverter is connected to a power conditioner. To various loads (for example, lighting fixtures and TV receivers).

  In order to reduce the thermal resistance between the pipes 6 and 7 and the thermoelectric conversion unit 5, the pipes 6 and 7 and the thermoelectric conversion unit 5 are mechanically tightened using bolts, nuts, bands, clamps, or the like. Yes. The pipes 6 and 7 are made of a metal material such as carbon steel, stainless steel, copper, copper alloy, aluminum, aluminum alloy, titanium and titanium alloy.

  A hot spring source (temperature of 90 ° C. or more) flows from the right side to the left side of the hot pipe 6 as a high temperature medium 6a. On the other hand, cold water (room temperature) flows from the left side to the right side in the drawing as the cold medium 7a in the cold pipe 7. That is, the high temperature medium 6 a in the pipe 6 and the cold medium 7 a in the pipe 7 flow in opposite directions. In order to effectively transfer the heat from the media 6a and 7a to the pipes 6 and 7 and increase the temperature difference in the thermoelectric conversion unit 5, it is desirable that each flow velocity of the media 6a and 7a is 0.1 m / sec or more. . A thermometer is attached to the upstream side of each of the pipes 6 and 7, and the temperature of the high temperature medium 6a and the temperature of the cold medium 7a are respectively measured. In the present embodiment, cold water at room temperature is used as the cold medium 7a. However, the cold medium is not limited to this, and vaporized natural gas flowing in the piping of a liquefied natural gas (LNG) plant is used as the cold medium. It is also possible to do.

  As shown in FIG. 2, the thermoelectric conversion unit 5 includes a thermoelectric conversion module 2, a pair of conductive metals 3 that sandwich the thermoelectric conversion module 2, a majority of the conductive metal 3 excluding the exposed surface, and the thermoelectric conversion module 2. Is provided with an insulating mold material 4 embedded in the entire structure. Of the pair of upper and lower conductive metals 3, the exposed surface of one conductive metal is in contact with the outer peripheral surface of the high-temperature pipe 6, and the exposed surface of the other conductive metal is in contact with the outer peripheral surface of the cold / hot pipe 7.

  The conductive metal 3 has a conductive metal plate 31 produced by fitting or cutting. The conductive metal plate 31 is made of any of copper, copper alloy, aluminum or aluminum alloy. The conductive metal plate 31 has a larger area on the side in contact with the thermoelectric conversion module surface than the thermoelectric conversion module, and a surface in contact with the heat source unit is smaller than a surface in contact with the thermoelectric conversion module. That is, the step 32 is formed in the middle of the thickness of the conductive metal plate 31. The step 32 has a role of preventing the insulating mold material 4 from peeling off.

  The surface of the conductive metal plate 31 that contacts the thermoelectric conversion module is made larger than the insulating plate of the thermoelectric conversion module. That is, both ends of the insulating plate 24 of the thermoelectric conversion module are located slightly inward (in the longitudinal direction of the pipe) than both ends of the conductive metal plate, and the end of the conductive metal plate and the insulating plate of the thermoelectric conversion module A step is formed between the ends. This step portion prevents the local stress concentration from occurring at the peripheral edge portion of the insulating plate 24 and prevents the corner portion and the edge portion of the insulating plate 24 from being chipped or cracked. In the present embodiment, the average length d1 of the step portion is set to 0.5 mm. Note that if the length d1 of the step portion is less than 0.5 mm, the occurrence of local stress concentration at the peripheral edge of the insulating plate 24 cannot be sufficiently prevented.

  The insulating mold material 4 is a composite material obtained by adding and mixing a desired amount of inorganic material particles to an epoxy resin. In the present embodiment, alumina particles having an average particle diameter of 10 μm are added to the epoxy resin as inorganic material particles so that the content is 10% by volume. By adding these inorganic material particles, the hardness and residual stress of the insulating mold material can be adjusted.

  Next, the thermoelectric conversion module will be described with reference to FIG.

  The thermoelectric conversion module 2 has a structure in which p-type and n-type thermoelectric conversion materials 21 and 22 are sandwiched between a pair of insulating plates 24. The internal structure of the thermoelectric conversion module 2 is a structure in which p-type thermoelectric conversion materials 21 and n-type thermoelectric conversion materials 22 are alternately arranged and are electrically connected to each other by a solder material 23. In this embodiment, bismuth-tellurium (Bi-Te) compounds are used as the thermoelectric conversion materials 21 and 22.

  An outline of the performance of the thermoelectric conversion material used for the thermoelectric conversion module will be described.

  The figure of merit Z of the thermoelectric conversion material is given by the following formula (1).

Z = S × (σ / κ) (1)
However, S: Seebeck coefficient (thermal electromotive force per 1 ° C. temperature difference), σ: electrical conductivity, κ: thermal conductivity.

  From equation (1), the figure of merit Z of the thermoelectric conversion material improves as the Seebeck coefficient S and the electrical conductivity σ increase and as the thermal conductivity κ decreases.

  FIG. 4 is a characteristic diagram showing the performance of various thermoelectric conversion materials with the temperature (° C.) on the horizontal axis and the dimensionless figure of merit ZT of the thermoelectric conversion material on the vertical axis. The dimensionless figure of merit ZT on the vertical axis is obtained by multiplying the figure of merit Z of the thermoelectric conversion material by the absolute temperature T. In the figure, characteristic line A is silicon-germanium (Si-Ge) material, characteristic line B is lanthanum-tellurium (La-Te) material, characteristic line C is lead-tin (Pb-Sn) material and tellurium -Selenium (Te-Se) based material and characteristic line D indicate bismuth-tellurium (Bi-Te) based material, respectively. As is apparent from the figure, silicon-germanium (Si-Ge) and lanthanum-tellurium (La-Te) materials are excellent in thermoelectric conversion performance in the high temperature region of 900 ° C. or higher, and in the intermediate temperature region of 400 to 600 ° C. Lead-tellurium (Pb-Te) -based materials have excellent thermoelectric conversion performance, and bismuth-tellurium (Bi-Te) -based materials have excellent thermoelectric conversion performance in a low temperature range of 150 ° C. In the present invention, the thermoelectric conversion module having a bismuth-tellurium (Bi-Te) -based material is the most popular because it aims to recover the thermal energy of a heat medium such as exhaust gas discarded at a low temperature of 150 ° C. or lower. It turns out that it is suitable.

  According to the thermoelectric power generation system of the present embodiment, even if the thickness of the thermoelectric conversion module varies, there is no contact, and even if the tightening force is increased, the thermoelectric conversion module is not damaged, and the power generation amount increases. To do.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. In addition, description of the part which this embodiment overlaps with the said embodiment is abbreviate | omitted.

  In the thermoelectric power generation system 1A of the present embodiment, the point that the exposed surface of the conductive metal 3 on one side is brought into contact with the outer peripheral surface of the high-temperature pipe 6 is the same as the above form, but the exposed surface of the conductive metal 3A on the other side is the same. A large number of heat dissipating fins 33 are attached, and these fins 33 are different from the above embodiment in that they are used as a cooling section so as to cool the conductive metal 3A on the other side of the thermoelectric conversion unit 5A.

  In the cooling section 3 </ b> A that is the conductive metal on the other side, the plurality of fins 33 are erected on the exposed surface of the conductive metal plate 31 so as to have a predetermined equal pitch interval. These fins 33 are exposed to the base end portion without being embedded in the insulating mold material 4 except for the end-portion fins 33 located at both ends of the thermoelectric conversion unit 5A.

  The fins 33 and the conductive metal plate 31 are made of copper, copper alloy, aluminum, or aluminum alloy plate.

  In the present embodiment, silica particles having an average particle diameter of 10 μm are added to the epoxy resin as the insulating mold material 4 so that the content is 10% by volume.

  In the present embodiment, the average length d2 of the step portion between the insulating plate 24 and the conductive metal plate 31 is 0.8 mm.

  In the present embodiment, bismuth-tellurium (Bi-Te) compounds are used as the thermoelectric conversion materials 21 and 22 of the thermoelectric conversion module.

  In the present embodiment, the thermoelectric conversion unit 5 </ b> A is attached to the outer peripheral surface of the pipe 6 using the clamp 9. That is, the plurality of thermoelectric conversion units 5 </ b> A are fixed to the pipe by a pressing jig such as the clamp 9.

  In the present embodiment, the high-temperature pipe 6 is configured so that a relatively low temperature exhaust gas generated in, for example, a waste incineration plant flows as the high-temperature medium 6a. That is, the low-temperature exhaust gas from the waste incineration plant is the heat recovery of the combustion exhaust gas from the waste incinerator by several heat-utilizing devices, and the exhaust gas having a temperature of 150 ° C. or less coming out from the heat-utilizing device on the most downstream side is the high-temperature medium 6a. As it flows inside. The flow rate of the high temperature medium 6a is preferably 0.1 m / sec or more.

  The required number of thermoelectric conversion units is adjusted as appropriate according to the amount of power generation desired. When installing the thermoelectric conversion unit to the pipe, apply it to the pipe after machining the conductive metal of the thermoelectric conversion unit in the total number of thermoelectric conversion units so that the surface of the thermoelectric conversion unit contacting the conductor and fin pipe is flat. .

  According to the present embodiment, heat moves from the pipe to the fin or from the fin to the pipe via the thermoelectric conversion module, and at that time, a temperature difference is generated in the thermoelectric conversion module, and power generation occurs.

(Third embodiment)
Next, a third embodiment will be described. In addition, description of the part which this embodiment overlaps with the said embodiment is abbreviate | omitted.

  In the system of the present embodiment, electricity is produced from waste heat generated in a garbage incineration plant and a cleaning plant, and used as a power source for lighting and ventilation fans in the plant. Specifically, power generation is performed by using the exhaust heat water that has cooled the incinerator and the exhaust heat water after the steam power generation by recovering the exhaust heat from the incinerator as the high temperature medium and the cooling water as the cold medium. Alternatively, power generation is performed by heat radiation using fins instead of the cooling medium piping.

(Fourth embodiment)
Next, a fourth embodiment will be described. In addition, description of the part which this embodiment overlaps with the said embodiment is abbreviate | omitted.

  In the system of the present embodiment, electricity is produced from exhaust heat generated at an oil refinery, and used as a power source for lighting in the station or a ventilation fan. Specifically, power generation is performed using the exhaust heat generated when the refined oil fractionated by refining crude oil is returned to room temperature as a high-temperature medium and cooling water as a cold medium. Alternatively, power generation is performed by heat radiation using fins instead of the cooling medium piping.

  As described above, according to the present invention, even if there is a variation in thickness between the thermoelectric conversion modules, the surface of the piping such as the heat medium transport pipe does not cause a single contact, and the tightening force can be increased. It is possible to provide a thermoelectric power generation system that generates a large amount of power without causing damage to the thermoelectric conversion module.

1, 1A ... thermoelectric power generation system,
2 ... Thermoelectric conversion module, 21, 22 ... Thermoelectric conversion material, 23 ... Solder, 24 ... Insulating plate,
3 ... conductive metal, 3A ... conductive metal (cooling part), 31 ... conductive metal plate, 32 ... step, 33 ... fin,
4 ... Insulating mold material, 5, 5A ... Thermoelectric conversion unit,
6 ... high temperature piping, 6a ... high temperature medium (source, combustion exhaust gas),
7 ... Cold pipe, 7a ... Cold medium (cold water, LNG), 9 ... Clamp.

Claims (10)

A thermoelectric power generation system having a plurality of thermoelectric conversion units that are attached to a pipe through which a medium flows and that generates heat by thermoelectrically converting the heat held by the medium,
The thermoelectric conversion unit is
A thermoelectric conversion module having a thermoelectric conversion material and a pair of insulating plates sandwiching the thermoelectric conversion material;
A pair of plate-like conductive metals that sandwich the thermoelectric conversion module from the outside of the insulating plate;
An insulating mold material in which a part of the conductive metal and the thermoelectric conversion module are embedded so that one surface of the conductive metal is exposed;
A thermoelectric power generation system comprising: The conductive metal includes a conductive metal plate having an exposed surface on which at least one surface is exposed, and further includes a plurality of fins protruding outward from the exposed surface of the conductive metal plate. 1. The thermoelectric power generation system according to 1. The thermoelectric power generation system according to claim 2, wherein a surface of the conductive metal plate is larger than a surface of the insulating plate at a surface where the conductive metal plate and the insulating plate of the thermoelectric conversion module are in contact with each other. The thermoelectric power generation system according to any one of claims 1 to 3, wherein the thermoelectric conversion material contains bismuth and tellurium. The thermoelectric power generation system according to any one of claims 1 to 4, wherein the medium is a fluid of water, insulating oil, or silicone. 6. The pipe according to claim 1, wherein the pipe is made of one or more metal materials selected from the group consisting of carbon steel, stainless steel, aluminum, aluminum alloy, titanium, and titanium alloy. The thermoelectric power generation system according to item 1. The conductive metal plate is made of one or two or more metal materials selected from the group consisting of copper, copper alloy, aluminum, and aluminum alloy, according to any one of claims 2 to 6. Thermoelectric power generation system. The thermoelectric power generation system according to claim 1, wherein the insulating mold material is an epoxy resin. The thermoelectric power generation system according to claim 1, wherein the insulating mold material is a composite material including an epoxy resin and an inorganic material. The thermoelectric power generation system according to claim 9, wherein the inorganic material in the insulating mold material is one or more selected from the group consisting of alumina particles and silica particles.

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