Thermoelectric power generation system using waste heat from engine of ships

Abstract

A thermoelectric power generation system utilizing waste heat from a ship engine according to the present invention comprises: a main body having one side connected to the exhaust section of the ship engine via a predetermined injection pipe to allow exhaust gas to be injected, and the other side connected to a discharge pipe for discharging the exhaust gas, and having an internal space formed therein through which the exhaust gas flows; and a thermoelectric module coupled to the main body, which generates electricity by converting a temperature difference between the upper and lower parts of a thermoelectric element mounted on the main body into a potential difference using the heat of the exhaust gas flowing through the internal space of the main body, wherein cooling water is supplied to the main body to generate a temperature difference between the upper and lower parts of the thermoelectric element.

Description

Technology Field

[0001] The present invention relates to a thermoelectric power generation system using waste heat from a ship engine for generating power using waste heat from a ship engine. Background Technology

[0003] Environmental regulations regarding exhaust gases are being strictly enforced worldwide, and this trend is also becoming stricter for maritime transport.

[0004] Accordingly, the International Maritime Organization regulates that global ship greenhouse gas emissions be reduced by 50% by 2050 compared to 2008 CO2 emissions.

[0005] To this end, new ships are required to apply the EEDI (Energy Efficiency Design Index) to improve energy efficiency by 10% compared to the baseline in 2015, 20% compared to the baseline in 2020, and 30% compared to the baseline from 2025 onwards.

[0006] Due to strengthened measures, by around 2026, the EEXI (Energy Efficiency Existing Ship Index) will be applied to existing ships that were not subject to regulation at the same level as the EEDI.

[0007] Various methods are required to satisfy such emission regulations, and among these methods, the application of a thermoelectric power generation system capable of converting thermal energy into electrical energy has the advantage of being applicable without functional limitations between existing onboard equipment components compared to other methods, and does not incur significant maintenance costs.

[0008] Thermoelectric power generation is an eco-friendly technology that directly converts thermal energy into electrical energy; it generates electricity as internal charges move when a temperature difference occurs across the two ends of a thermoelectric module.

[0009] Such thermoelectric power generation businesses are attracting significant attention as eco-friendly items because they can recover waste heat generated from industrial sites or other internal combustion engines.

[0010] Of the total energy generated by a ship's main engine, about 40% is waste heat generated in the engine's intake and exhaust sections.

[0011] Most ships install steam boilers in their exhaust systems to recover some of the waste heat.

[0012] However, even when using steam boilers, waste heat remains, and the application of various systems to utilize it is being studied. If waste heat is recovered by applying thermoelectric power generation systems to the intake and exhaust sections, the efficiency of the ship can be significantly improved. The problem to be solved

[0014] The present invention has been devised to solve the various conventional problems described above, and aims to provide a thermoelectric power generation system utilizing waste heat from a ship engine that can significantly improve the efficiency of a ship by converting the thermal energy of waste heat generated from the ship engine into electrical energy. means of solving the problem

[0016] To achieve the above objectives, a first embodiment of a thermoelectric power generation system using waste heat from a ship engine according to the present invention comprises: a main body having one side connected to the exhaust section of a ship engine via a predetermined injection pipe to allow exhaust gas to be injected, and the other side connected to a discharge pipe for discharging the exhaust gas, and having an internal space formed therein through which the exhaust gas flows; and a thermoelectric module coupled to the main body, which generates electricity by converting a temperature difference between the upper and lower parts of a thermoelectric element mounted on the main body into a potential difference using the heat of the exhaust gas flowing through the internal space of the main body, wherein cooling water is supplied to the main body to generate a temperature difference between the upper and lower parts of the thermoelectric element.

[0017] The above main body may include: a base having an internal receiving space formed therein, openings formed at one end and the other end respectively, and an open top and / or bottom; a pair of frames formed as hollow bodies with both ends open, wherein the inner ends are hermetically connected to the openings at one end and the other end of the base respectively; and a pair of flanges having a through hole formed in the center to communicate with the openings at the outer ends of the pair of frames respectively, one connected to the injection pipe and the other connected to the discharge pipe.

[0018] It is preferable that the above bases be provided in multiple numbers and arranged horizontally in parallel with each other.

[0019] The thermoelectric module may include: a heat sink that is housed in an internal housing space of the base and absorbs heat from the exhaust gas; a thermoelectric element disposed on the outside of the heat sink and housed in an internal housing space of the base, which receives heat from the heat sink and converts a temperature difference generated by the cooling water into a potential difference to generate electricity; a water jacket base disposed on the outside of the thermoelectric element and housed in an internal housing space of the base, having a plurality of flow paths formed to allow cooling water flowing in through a cooling water injection hole formed in the base to flow; and a water jacket cover disposed on the outside of the water jacket base and watertightly coupled to the open upper and / or lower part of the base.

[0020] A sealing member may be disposed between the water jacket cover and the open upper and / or lower portions of the base.

[0022] Meanwhile, as a second embodiment of a thermoelectric power generation system using waste heat from a ship engine according to the present invention, the main body portion is provided in a plurality and spaced apart in vertical parallel, and an injection pipe connected to the exhaust portion of the ship engine is coupled to a plurality of first connecting pipes divided into the same number as the main body portion, and the plurality of first connecting pipes are each connected to one side of the main body portion, and a plurality of second connecting pipes are each connected to the other side of the plurality of main body portions, and the plurality of second connecting pipes may be configured to be connected to an exhaust pipe that discharges the exhaust gas.

[0023] At this time, the main body part is provided in two parts, and the injection tube and the first connecting tube may be formed in a Y shape.

[0024] In addition, the second connecting pipe and the discharge pipe may be formed in a Y shape.

[0026] Specific details of other embodiments are included in "Specific details for carrying out the invention" and the attached "drawings".

[0027] The advantages and / or features of the present invention and the methods for achieving them will become clear by referring to the various embodiments described in detail below together with the accompanying drawings.

[0028] However, it should be understood that the present invention is not limited to the configurations of each embodiment disclosed below, but may be implemented in various different forms, and that each embodiment disclosed in this specification is provided merely to make the disclosure of the present invention complete and to fully inform those skilled in the art of the scope of the present invention, and that the present invention is defined only by the scope of each claim of the claims. Effects of the invention

[0030] According to the means for solving the aforementioned problem, the present invention has the following effects.

[0031] The thermoelectric power generation system according to the present invention includes a thermoelectric module that generates electricity by converting the temperature difference between the upper and lower parts of a thermoelectric element mounted on the main body into a potential difference using the heat of exhaust gas flowing through the internal space of the main body connected to the exhaust part of a ship engine, and is configured to supply cooling water to the main body to create a temperature difference between the upper and lower parts of the thermoelectric element, thereby converting the thermal energy of the exhaust gas waste heat generated from the ship engine into electrical energy, which has the effect of significantly improving the efficiency of the ship.

[0032] In addition, the present invention is configured such that a plurality of main body sections of a thermoelectric power generation system are provided and spaced apart in vertical parallel, and an injection pipe connected to the exhaust section of a ship engine is coupled to a plurality of first connecting pipes divided into the same number as the main body sections, each of the plurality of first connecting pipes is connected to one side of the main body section, and each of the plurality of second connecting pipes is connected to the other side of the main body section, and the plurality of second connecting pipes are connected to a discharge pipe that discharges exhaust gas, thereby reducing the temperature difference between the exhaust gas injected from the ship engine exhaust section and the exhaust gas discharged through the discharge pipe after passing through the thermoelectric power generation system, so as to improve the output performance of the thermoelectric power generation system. Brief explanation of the drawing

[0034] Figure 1 is a diagram illustrating the basic principle of the Peltier effect by a thermoelectric element. Figure 2 is a diagram illustrating the basic principle of the Seebeck effect by a thermoelectric element. FIG. 3 is a schematic diagram showing a thermoelectric power generation system using waste heat from a ship engine according to the first embodiment of the present invention, in a state in which waste heat is supplied from a ship engine and cooling water is supplied from a cooling chiller. FIG. 4 is a diagram showing a disassembled thermoelectric power generation system using waste heat from a ship engine according to the first embodiment of the present invention. Figure 5 is a photograph showing a thermoelectric power generation system using waste heat from a ship engine according to the first embodiment of the present invention. Figure 6 is a photograph showing a thermoelectric power generation system using waste heat from a ship engine according to the first embodiment of the present invention, shown by module. FIG. 7 is a graph showing the change in power generation amount (W) by mode of a thermoelectric power generation system using waste heat from a ship engine according to the first embodiment of the present invention. Figure 8 is a graph showing the temperature change by mode of a thermoelectric power generation system using waste heat from a ship engine according to the first embodiment of the present invention. FIG. 9 is a graph showing the change in temperature difference (△T) of a thermoelectric element by mode of a thermoelectric power generation system using waste heat from a ship engine according to the first embodiment of the present invention. FIG. 10 is a graph showing the change in the maximum power generation amount (Pmax (W)) of each module according to the mode of a thermoelectric power generation system using waste heat from a ship engine according to the first embodiment of the present invention. FIG. 11 is a schematic diagram showing the state in which a thermoelectric power generation system using waste heat from a ship engine according to a second embodiment of the present invention is installed on a ship. FIG. 12 is a diagram showing the state in which a waste heat exhaust gas supply pipe and a residual exhaust gas discharge pipe are connected to a thermoelectric power generation system using waste heat from a ship engine according to the second embodiment of the present invention. FIG. 13 is a photograph showing a thermoelectric power generation system using waste heat from a ship engine according to a second embodiment of the present invention. Specific details for implementing the invention

[0035] Hereinafter, a preferred embodiment of a thermoelectric power generation system utilizing waste heat from a ship engine according to the present invention will be described in detail with reference to the attached drawings. For reference, the terms and words used in this specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings. Instead, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention, they must be interpreted in a meaning and concept consistent with the technical spirit of the present invention. Furthermore, the embodiments described in this specification and the configurations illustrated in the drawings are merely one preferred embodiment of the present invention and do not represent all aspects of the technical spirit of the present invention; therefore, it should be understood that various equivalents and modifications capable of replacing them may exist at the time of filing this application.

[0036] Figure 1 is a diagram illustrating the basic principle of the Peltier effect by a thermoelectric element, and Figure 2 is a diagram illustrating the basic principle of the Seebeck effect by a thermoelectric element.

[0037] The Peltier effect is a type of thermoelectric effect that refers to the phenomenon of converting electrical energy into thermal energy or thermal energy into electrical energy.

[0038] The Peltier effect is mainly used in small electronic devices, cooling fans, coolers, etc., called Peltier modules or Peltier devices.

[0039] Generally, a Peltier module is composed of a structure in which P-type and N-type semiconductors are alternately arranged.

[0040] The Peltier effect transfers heat by utilizing the properties of P-type and N-type semiconductor materials.

[0041] P-type and N-type semiconductors have different thermoelectric properties depending on the flow of specific electric charges.

[0042] In P-type semiconductors, charges flow as positive charges, while in N-type semiconductors, charges flow as negative charges.

[0043] When charge transfer occurs in this way, heat is absorbed or released due to the thermoelectric effect between the P-type semiconductor and the N-type semiconductor.

[0044] Therefore, in devices using thermoelectric cooling, a Peltier module can be used to effectively transfer heat between two materials, thereby achieving a cooling effect.

[0045] A Peltier element refers to a small electronic device that transfers heat based on the Peltier effect.

[0046] This device is composed of a structure in which P-type and N-type semiconductors are alternately arranged, and it can effectively transfer heat using electrical energy.

[0047] Peltier devices primarily use silicon-based semiconductor materials and consist of P-type and N-type semiconductors.

[0048] In addition, other semiconductor materials such as germanium, indium anthamonium, and gallium arsenide may be used to some extent.

[0049] Peltier devices are fabricated in the form of small, flat modules and have semiconductor patterns in which positive and negative charges are arranged alternately.

[0050] This pattern plays a role in inducing charge transfer and thermoelectric effects between P-type and N-type semiconductors.

[0051] When electrical energy is supplied to a Peltier element, a thermoelectric effect occurs as the energy passes between the P-type semiconductor and the N-type semiconductor.

[0052] As a result, one side of the device is cooled and the other side is heated.

[0053] By utilizing this thermoelectric effect, Peltier elements can effectively transfer heat or generate heat.

[0054] Meanwhile, the Seebeck effect is the opposite concept of the Peltier effect.

[0055] In other words, when two different types of metals are connected to form a closed circuit and a temperature difference is applied between the two points, a potential difference is generated at both ends, causing current to flow.

[0056] The relatively high heat from the upper part moves to the lower part according to the laws of thermodynamics, and an electric current is generated from the top to the bottom.

[0058] FIG. 3 is a schematic diagram showing a thermoelectric power generation system using waste heat from a ship engine according to the first embodiment of the present invention, in a state in which waste heat is supplied from a ship engine and cooling water is supplied from a cooling chiller.

[0059] A thermoelectric power generation system (100) using waste heat from a ship engine according to the present invention comprises a main body (110) and a thermoelectric module (120).

[0060] One side of the main body (110) is formed to be connected to the exhaust part (11) of the ship engine (10) and a predetermined injection pipe (20) so that exhaust gas is injected, and the other side is connected to a discharge pipe (40) that discharges exhaust gas, and an internal space is formed in which exhaust gas flows.

[0061] A cooling chiller (70) is provided on one side of the main body (110) to supply cooling water to the main body (110) so as to create a temperature difference between the upper and lower parts of the thermoelectric element (122) described later.

[0062] The thermoelectric module (120) is coupled to the main body (110), and generates electricity by converting the temperature difference between the upper and lower parts of the thermoelectric element (122) mounted on the main body (110) into a potential difference using the heat of the exhaust gas flowing through the internal space of the main body (110).

[0064] FIG. 4 is a disassembled view of a thermoelectric power generation system using waste heat from a ship engine according to the first embodiment of the present invention, and FIG. 5 is a photograph showing a thermoelectric power generation system using waste heat from a ship engine according to the first embodiment of the present invention.

[0065] The main body (110) includes a base (111), a frame (113), and a flange (115).

[0066] The base (111) is formed in the shape of a hollow rectangular parallepiped to form an internal receiving space, and an opening (not shown) is formed at one end (111a) and the other end (111b), respectively, and the top and / or bottom are open.

[0067] These bases (111) can be provided in multiple numbers and arranged horizontally in parallel with each other.

[0068] The frame (113) is formed in the shape of a cuboid and is formed as a hollow body with both ends open, and is provided as a pair so that the inner end (113a) is hermetically connected to the openings of one end (111a) and the other end (111b) of the base (111), respectively.

[0069] Such a frame (113) can be formed in a shape that narrows from the inner end (113a) toward the outer end (113b).

[0070] The flange (115) is formed in an annular shape with a through hole (115a) formed in the center, and is provided in a pair so as to communicate with the openings of the outer ends (113b) of the pair of frames (113).

[0071] One of these pair of flanges (115) is connected to the injection pipe (20) and the other is connected to the discharge pipe (40).

[0072] The thermoelectric module (120) includes a heat sink (121), a thermoelectric element (122), a water jacket base (123), a water jacket cover (124), and a sealing member (125).

[0073] The heat sink (121) is housed in the internal receiving space of the base (111) of the main body (110) and absorbs the heat of the exhaust gas.

[0074] A heat sink (121) of this type is a heat sink component, also called a heat dissipation plate, which collects operating heat generated by a machine and releases it to a medium with a relatively low temperature (air, water, oil, etc.), and is a type of heat exchanger.

[0075] The heat sink (121) is a cooling device that has a material and structure specialized for heat conduction and radiation, and takes heat from a heat-generating system and releases it to the surroundings.

[0076] The thermoelectric element (122) is positioned on the outside of the heat sink (121) and accommodated in the internal receiving space of the base (111), receives heat from the heat sink (121), and converts the temperature difference generated by the cooling water into a potential difference to generate electricity.

[0077] These thermoelectric elements (122) mainly use Peltier elements.

[0078] The water jacket base (123) is formed in the shape of a plate and is placed on the outside of the thermoelectric element (122) and accommodated in the internal receiving space of the base (111), and a plurality of flow paths are formed so that cooling water flows in through the cooling water pipe (111c) fitted into the cooling water injection hole (111d) formed in the base (111).

[0079] A water jacket cover (124) is positioned on the outside of the water jacket base (123) and is watertightly connected to the open upper and / or lower part of the base (111).

[0080] A sealing member (125) is placed between the open upper and / or lower portions of the water jacket cover (124) and the base (111), and a square ring-shaped rubber gasket is mainly used.

[0082] Figure 6 is a photograph showing a thermoelectric power generation system using waste heat from a ship engine according to the first embodiment of the present invention, shown by module.

[0083] FIG. 7 is a graph showing the change in power generation amount (W) by mode of a thermoelectric power generation system using waste heat from a ship engine according to the first embodiment of the present invention, FIG. 8 is a graph showing the change in temperature by mode of a thermoelectric power generation system using waste heat from a ship engine according to the first embodiment of the present invention, FIG. 9 is a graph showing the change in temperature difference (△T) of a thermoelectric element by mode of a thermoelectric power generation system using waste heat from a ship engine according to the first embodiment of the present invention, and FIG. 10 is a graph showing the change in maximum power generation amount (Pmax (W)) of each module by mode of a thermoelectric power generation system using waste heat from a ship engine according to the first embodiment of the present invention.

[0084] In order to evaluate the thermoelectric power generation system using waste heat from a ship engine according to the first embodiment of the present invention, a 350 KW class diesel engine was adopted as the evaluation engine.

[0085] The specifications of this evaluation engine are as shown in Table 1 below.

[0087] [Table 1] Engine Specifications Subject to Evaluation

[0088]

[0090] Since there is no ISO standard engine mode for thermoelectric power generation, the power generation of the thermoelectric power generation system was evaluated using the E3 mode, which is the marine engine test cycle of ISO 8178, the standard for measuring non-road engine emissions.

[0092] [ISO 8178]

[0093] ISO 8178 is an international standard for measuring exhaust emissions in various off-road engine applications and is an international evaluation standard used for emission certification and / or type approval testing in various countries, including the United States, the European Union, and Japan.

[0094] - E3 mode is an evaluation method mode for large engines that operate at engine speeds without ship size restrictions. It measures changes in exhaust gas emissions in 4 stages, from the engine's maximum output to the engine idle (idle state).

[0096] [Test Cycle Conditions by Evaluation Engine Mode]

[0097] - After stabilization for each engine load condition mode, the engine's operating status and the power generation of the thermoelectric power generation system were measured.

[0098] - The engine output and the temperature at the front and rear ends of the thermoelectric power generation system were measured for 1 minute after 500 seconds following the change in mode, and the results were reflected.

[0100] [Table 2] ISO 8178-E3 Test Cycle Conditions

[0101]

[0103] Two bases (111) of the main body (110) are provided, and two thermoelectric modules (120) (Module 1 & Module 3) are each placed on the upper part of the base (111), and two thermoelectric modules (120) (Module 2 & Module 4) are each placed on the lower part of the base (111).

[0104] One electronic load device was connected to each thermoelectric module to measure the power generation amount per module and sum it up to reflect the maximum output.

[0106] [Table 3] This is a table showing the output results evaluated by mode for a thermoelectric power generation system using waste heat from a ship engine according to the first embodiment of the present invention.

[0107]

[0109] For Mode 1, the output was confirmed to be 367.25 W when the ship engine was operated at 100% output.

[0110] At this time, the temperature of the thermoelectric device was 306℃ on the hot side and 43℃ on the cold side, and the temperature difference (△T) of the thermoelectric power generation system was 264℃.

[0112] [Table 4] This is a table showing the results of power generation by mode of a thermoelectric power generation system using waste heat from a ship engine according to the first embodiment of the present invention.

[0113]

[0115] The maximum deviation in power generation per module showed a difference in power generation of 2 to 6 W.

[0116] When calculated as a fraction, the difference in power generation was up to 33% in the low-temperature Mode 4 section.

[0117] It was found that differences in power generation between modules occurred due to variations based on module location.

[0118] As a result of resistance measurement after evaluating the thermoelectric system, the average resistance increased by 1.35Ω compared to before evaluation, and the resistance increase rate was confirmed to be 8%.

[0120] FIG. 11 is a schematic diagram showing the state in which a thermoelectric power generation system using waste heat from a ship engine according to the second embodiment of the present invention is installed on a ship, FIG. 12 is a diagram showing the state in which a waste heat exhaust gas supply pipe and a residual exhaust gas discharge pipe are connected to the thermoelectric power generation system using waste heat from a ship engine according to the second embodiment of the present invention, and FIG. 13 is a photograph showing the thermoelectric power generation system using waste heat from a ship engine according to the second embodiment of the present invention.

[0121] A thermoelectric power generation system (100) using waste heat from a ship engine according to the present invention comprises a main body (110) and a thermoelectric module (120).

[0122] Since the individual configurations of the main body (110) and the thermoelectric module (120) are identical to the configuration of the first embodiment described above, in this second embodiment, only the configurations different from those of the first embodiment will be described.

[0123] The main body (110) is provided in multiple units and spaced apart in vertical parallel, and the injection pipe (20) connected to the exhaust unit (11) of the ship engine (10) is combined with the first connecting pipe (30), which is divided into multiple units equal to the number of main body (110).

[0124] These multiple first connecting pipes (30) are each connected to one side of the main body (110), and multiple second connecting pipes (50) are each connected to the other side of the main body (110).

[0125] At this time, a plurality of second connecting pipes (50) may be configured to be connected to a discharge pipe (40) that discharges exhaust gas.

[0126] Preferably, the main body (110) is provided in two parts, and the injection pipe (20) and the first connecting pipe (30) can be formed in a Y shape.

[0127] In addition, the second connecting pipe (50) and the discharge pipe (40) can be formed in a Y shape.

[0128] In this way, one additional thermoelectric power generation system (100) of the same specifications was placed, and the design and manufacturing proceeded with a structure in which two systems are connected to one engine pipe.

[0129] In other words, if manufactured as a single system, the longitudinal length of the system becomes excessively long, and the temperature difference between the injected exhaust gas and the exhaust gas discharged through the thermoelectric power generation system is expected to be up to 15 to 20 percent, which is expected to result in lower output compared to the target output.

[0130] Accordingly, by distributing the additional piping in a Y-shape rather than extending the length of the thermoelectric power generation system, it was possible to increase the area in contact with the equally high-temperature gas.

[0132] [Table 5] This is a table showing the resistance values ​​for each module of a thermoelectric power generation system using waste heat from a ship engine according to the second embodiment of the present invention.

[0133]

[0135] The resistance of each thermoelectric module part of the thermoelectric power generation system (100) was measured to confirm the normal operating state.

[0136] It was confirmed to be within the range of 24 ± 0.3Ω compared to the initial resistance specification.

[0137] Each thermoelectric module is composed of 8 elements (192 ± 24Ω).

[0139] [Table 6] This is a table showing the output results of evaluating a thermoelectric power generation system using waste heat from a ship engine according to the second embodiment of the present invention.

[0140]

[0142] During the evaluation, the maximum output of the thermoelectric power generation system was 332 W.

[0143] With the temperature difference (△T) of the thermoelectric element formed at the level of 200℃ due to the exhaust gas, it was confirmed that the power generation amount was 55 W per element.

[0145] As such, the present invention is configured such that a plurality of main body portions (110) of a thermoelectric power generation system (100) are provided and arranged in a vertically parallel manner, and an injection pipe (20) connected to the exhaust portion (11) of a ship engine (10) is connected to a plurality of first connecting pipes (30) divided into the same number as the main body portion (110), and each of the plurality of first connecting pipes (30) is connected to one side of the main body portion (110), and each of the plurality of second connecting pipes (50) is connected to the other side of the plurality of main body portions (110), and each of the plurality of second connecting pipes (50) is connected to an exhaust pipe (40) that discharges exhaust gas, thereby reducing the temperature difference between the exhaust gas injected from the exhaust portion (11) of the ship engine (10) and the exhaust gas discharged through the exhaust pipe (40) after passing through the thermoelectric power generation system (100), so as to improve the output performance of the thermoelectric power generation system (100).

[0147] The present invention described above is not limited by the aforementioned embodiments and attached drawings, and it will be obvious to those skilled in the art that various substitutions, modifications, and changes are possible within the scope of the technical concept of the present invention. Explanation of the symbols

[0149] 10: Ship Engine 20 : Injection tube 30: First connector 40 : Discharge pipe 50 : 2nd connector 70 : Cooling chiller 100 : Thermoelectric power generation system 110 : Main body 111 : Bass 113 : Frame 115 : Flange 120: Thermoelectric module 121 : Heat sink 122 : Thermoelectric element 123 : Water Jacket Base 124 : Water Jacket Cover 125 : Sealing member

Claims

Claim 1 A thermoelectric power generation system utilizing waste heat from a ship engine, comprising: a main body portion having one side connected to the exhaust section of a ship engine via a predetermined injection pipe to allow exhaust gas to be injected, and the other side connected to a discharge pipe for discharging the exhaust gas, and having an internal space formed therein through which the exhaust gas flows; and a thermoelectric module coupled to the main body portion and generating electricity by converting a temperature difference between the upper and lower parts of a thermoelectric element mounted on the main body portion into a potential difference using the heat of the exhaust gas flowing through the internal space of the main body portion; wherein cooling water is supplied to the main body portion to generate a temperature difference between the upper and lower parts of the thermoelectric element, and the main body portion is provided in multiple units and spaced apart in vertical parallel, and the injection pipe connected to the exhaust section of the ship engine is coupled to a first connecting pipe divided into multiple units equal to the number of the main body portions, and the multiple first connecting pipes are each connected to one side of the main body portion, and the multiple second connecting pipes are each connected to the other side of the multiple main body portions, and the multiple second connecting pipes are connected to the discharge pipe for discharging the exhaust gas. Claim 2 A thermoelectric power generation system utilizing waste heat from a ship engine according to claim 1, wherein the main body comprises: a base having an internal receiving space formed therein, openings formed at one end and the other end respectively, and an open top and / or bottom; a pair of frames formed as hollow bodies with both ends open, wherein the inner ends are hermetically connected to the openings at one end and the other end of the base respectively; and a pair of flanges having a through hole formed in the center and communicating with the openings at the outer ends of the pair of frames respectively. Claim 3 A thermoelectric power generation system utilizing waste heat from a ship engine according to claim 2, wherein the bases are provided in plurality and arranged horizontally in parallel with each other. Claim 4 A thermoelectric power generation system utilizing waste heat from a ship engine according to claim 2, wherein the thermoelectric module comprises: a heat sink that absorbs heat from the exhaust gas and is housed in the internal housing space of the base; a thermoelectric element disposed on the outside of the heat sink and housed in the internal housing space of the base, which receives heat from the heat sink and converts a temperature difference generated by the cooling water into a potential difference to generate electricity; a water jacket base disposed on the outside of the thermoelectric element and housed in the internal housing space of the base, having a plurality of flow paths formed to allow cooling water flowing in through a cooling water injection hole formed in the base to flow; and a water jacket cover disposed on the outside of the water jacket base and watertightly coupled to the open upper and / or lower part of the base. Claim 5 A thermoelectric power generation system using waste heat from a ship engine according to claim 4, wherein a sealing member is disposed between the water jacket cover and the open upper and / or lower portion of the base. Claim 6 delete Claim 7 A thermoelectric power generation system using waste heat from a ship engine according to claim 1, wherein the main body portion is provided in two parts, and the injection pipe and the first connecting pipe are formed in a Y shape. Claim 8 A thermoelectric power generation system using waste heat from a ship engine according to claim 7, wherein the second connecting pipe and the discharge pipe are formed in a Y shape.

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