JP6322795B2 - Marine thermoelectric power generation system and ship - Google Patents

Description

  The present invention relates to a ship thermoelectric power generation system that converts heat of exhaust gas discharged from an internal combustion engine of a ship into electricity using a thermoelectric power generation element that utilizes the Seebeck effect.

  Patent Document 1 discloses a power generation device for a water-cooled engine mounted on a ship. In Patent Document 1, the power generation device is configured by a thermoelectric generator, and the water-cooled engine partitions the exhaust passage and the coolant passage adjacent to each other by a wall, and includes the thermoelectric generator in the wall. Yes. In this thermoelectric generator, the high temperature portion is brought close to the exhaust passage, and the low temperature portion is brought close to the cooling water passage. Therefore, the thermoelectric generator generates an electromotive force according to the temperature difference between the high temperature portion and the low temperature portion, and generates power using the temperature difference.

  Patent Document 2 discloses a configuration in which a Peltier element module is provided in a water-cooled heat exchanger for cooling an internal combustion engine such as a ship to convert waste heat into electric energy. In Patent Document 2, a Peltier element module is sandwiched between a heat medium liquid radiation pipe and a heat radiation fin, so that one of the Peltier element modules is overheated with a high-temperature heat medium liquid and the other is cooled with air or seawater to generate power. To do.

  Patent Document 3 discloses an apparatus in which a thermoelectric generator is attached to an exhaust pipe through which exhaust from an engine flows and a cooling water circulation path through which cooling water circulates by a cooling water pump. In Patent Document 3, when a plurality of thermoelectric power generation elements are attached to the exhaust pipe and the cooling water pipe, the flow of the cooling water in the cooling water pipe is designed so as to face the direction of the exhaust gas flowing through the exhaust pipe. Since the temperature difference between the exhaust pipe and the cooling water pipe in the thermoelectric power generation element on the side increases, the power generation difference in each thermoelectric power generation element is reduced, and the overall power generation capacity is improved.

  Patent Document 4 discloses an apparatus that performs thermoelectric power generation by a thermoelectric power generation unit by supplying cooling water from the engine to the thermoelectric power generation unit. In Patent Document 4, when the engine is at a high temperature, overheating of the engine is suppressed by not circulating the cooling water from the engine through the thermoelectric cooling water passage.

  Patent Document 5 discloses a thermoelectric generator that generates power with a thermoelectric element using a high temperature side heat source as exhaust gas from an engine and a low temperature side heat source as cooling water for an engine cooled by a radiator. In Patent Document 5, variable means for changing the supply condition of at least one of exhaust gas and cooling water to the thermoelectric element is provided so that a temperature difference generated in the thermoelectric element becomes large.

JP 2010-242700 A JP 2007-198276 A JP 2005-299417 A JP 2005-307886 A Japanese Patent Application Laid-Open No. 2004-360681

As disclosed in Patent Documents 1 to 5, thermoelectric power generation apparatuses that generate power using exhaust gas discharged from an internal combustion engine and cooling water that cools the internal combustion engine are known.
However, the thermoelectric conversion elements used in these thermoelectric power generation devices are limited in terms of the maximum operating temperature in terms of specifications due to the bonding material conditions, material oxidation, and the like.
For example, in a thermoelectric conversion element using a bismuth / tellurium system (Bi-Te system), the maximum use temperature is about 230 ° C., and in a thermoelectric conversion element using a lead / tellurium system (Pb—Te system), the maximum use temperature is It is about 530 degreeC.
Accordingly, when exhaust heat recovery is performed using exhaust gas of an internal combustion engine exceeding 600 ° C., the surface temperature of the high-temperature portion of the thermoelectric conversion element is set to an appropriate temperature in order to maintain stable long-term power generation operation. It is necessary to adjust to. Further, it is desired to maintain the surface temperature of the high temperature part at an appropriate temperature equal to or lower than the maximum use temperature in accordance with the maximum use temperature of the thermoelectric conversion element used.

  Therefore, an object of the present invention is to provide a marine thermoelectric power generation system and a marine vessel that can adjust the surface temperature of the high temperature portion of the thermoelectric conversion element to an appropriate temperature in order to maintain stable long-term power generation operation. To do.

  In the marine thermoelectric power generation system corresponding to the first aspect of the present invention, the exhaust gas path through which the exhaust gas discharged from the internal combustion engine of the ship passes, the cooling water path through which the cooling water for cooling the internal combustion engine passes, and the cooling The upstream side of the mixing means provided in the exhaust gas path for injecting water and lowering the temperature of the exhaust gas, and the mixing means for generating power by receiving heat from the exhaust gas path in the high temperature part and radiating heat to the cooling water path in the low temperature part The thermoelectric power generation means provided in the above, the mixer means provided upstream of the thermoelectric power generation means for mixing the cooling water with the exhaust gas in the exhaust gas path, and the cooling water supplied by the mixer means are adjusted to control the temperature in the high temperature section And a temperature control means. According to the first aspect of the present invention, the temperature control means for controlling the temperature in the high temperature part by adjusting the cooling water supplied by the mixer means is provided, so that the surface temperature of the high temperature part of the thermoelectric power generation means is appropriately set. The temperature can be adjusted to a stable temperature and stable long-term power generation operation can be maintained, and since the thermoelectric power generation means is provided upstream of the mixing means, the high temperature part is affected by a decrease in the exhaust gas temperature. Power generation is possible without any problems.

  According to a second aspect of the present invention, there is provided the marine thermoelectric power generation system according to the first aspect, wherein the temperature control means is controlled based on a use upper limit temperature of the thermoelectric power generation means. According to this invention of Claim 2, according to the specification of the thermoelectric power generation means to be used, the surface temperature of the high temperature part of a thermoelectric power generation means can be adjusted to suitable temperature.

  According to a third aspect of the present invention, there is provided the marine thermoelectric power generation system according to the second aspect, further comprising temperature detecting means for detecting a temperature in the high temperature portion, wherein the temperature control means includes a detected value of the temperature detecting means, an upper limit temperature for use, Based on the above, the mixer means is controlled. According to the third aspect of the present invention, it is possible to maintain a stable long-term power generation operation without exposing the thermoelectric power generation means to a high temperature exceeding the use upper limit temperature.

  According to a fourth aspect of the present invention, there is provided the marine thermoelectric power generation system according to the second or third aspect, wherein the temperature control means adjusts the temperature difference between the high temperature portion and the low temperature portion at a temperature that is equal to or lower than a use upper limit temperature. And controlling the power generation output of the thermoelectric power generation means. According to the fourth aspect of the present invention, the amount of power generation can be improved.

  According to a fifth aspect of the present invention, in the thermoelectric power generation system for a ship according to any one of the first to fourth aspects, the mixer means has an opening that opens to an exhaust gas path upstream of the thermoelectric power generation means. The cooling water is injected from the opening in the flow direction of the exhaust gas. According to the fifth aspect of the present invention, the temperature of the exhaust gas can be quickly reduced, and an adverse effect on the internal combustion engine can be prevented by not inhibiting the flow of the exhaust gas.

  According to a sixth aspect of the present invention, in the marine thermoelectric power generation system according to the fifth aspect, the opening has a porous structure and jets cooling water in a shower shape. According to the sixth aspect of the present invention, the temperature of the exhaust gas can be further rapidly and uniformly reduced by spraying in a shower shape.

  According to a seventh aspect of the present invention, in the marine thermoelectric power generation system according to any one of the first to sixth aspects, the cooling water is continuously taken in by the water intake means at least during the operation of the internal combustion engine. The engine is continuously discharged after being cooled. According to this invention of Claim 7, compared with the case where cooling water is circulated, a cooling effect can be acquired stably.

  The eighth aspect of the present invention is the marine thermoelectric power generation system according to the seventh aspect, characterized in that a part of the taken cooling water is branched and flowed through the cooling water path. According to the eighth aspect of the present invention, it is possible to supply the cooling water to the mixer means separately from the cooling water flowing through the cooling water path, and to prevent the cooling effect of the internal combustion engine from being impaired.

  According to a ninth aspect of the present invention, there is provided the marine thermoelectric power generation system according to any one of the first to eighth aspects, wherein the temperature control means adjusts a flow rate adjustment valve provided in the cooling water path to adjust the cooling water. It is characterized by controlling the flow rate. According to the present invention described in claim 9, since the temperature decrease amount of the exhaust gas can be adjusted, the surface temperature of the high temperature portion of the thermoelectric power generation means can be adjusted to an appropriate temperature without decreasing the power generation amount.

  The tenth aspect of the present invention is the marine thermoelectric power generation system according to any one of the first to ninth aspects, wherein the thermoelectric power generation means includes a plurality of thermoelectric power generation elements arranged around the exhaust gas path. It is characterized in that the thermoelectric generator is sandwiched between cooling water paths. According to the tenth aspect of the present invention, it is possible to efficiently receive heat from the exhaust gas path and release heat to the cooling water path.

  The eleventh aspect of the present invention is the marine thermoelectric power generation system according to the tenth aspect, characterized in that heat transfer fins are provided on the inner surface of the exhaust gas path in which the thermoelectric power generation elements are arranged. According to the present invention described in claim 11, the amount of heat received from the exhaust gas path can be increased.

  According to a twelfth aspect of the present invention, in the marine thermoelectric power generation system according to the tenth or eleventh aspect, a seal material having compressibility and heat resistance is provided around the thermoelectric power generation element, and the seal material is exhaust gas. It is characterized by being sandwiched between the path and the cooling water path. According to the present invention as set forth in claim 12, the sealing material can prevent condensation and salt damage of the thermoelectric power generation element, and can improve durability. Moreover, since it becomes easy to make the surface pressure concerning each thermoelectric power generation element uniform, electric power generation efficiency can be improved.

  According to a thirteenth aspect of the present invention, in the marine thermoelectric power generation system according to any one of the tenth to twelfth aspects, the flow direction of the cooling water in the cooling water path is the flow direction of the exhaust gas in the exhaust gas path. It is characterized by facing. According to the thirteenth aspect of the present invention, even when a thermoelectric power generation element is provided in the flow direction, the temperature difference between the high temperature part and the low temperature part in each thermoelectric power generation element can be made uniform, and the high temperature part and the low temperature part. The temperature difference can be increased and the power generation efficiency can be increased.

  According to a fourteenth aspect of the present invention, in the marine thermoelectric power generation system according to any one of the first to thirteenth aspects, the temperature control means increases the supply amount of the cooling water before the operation of the internal combustion engine is stopped. It is characterized by adjusting. According to the present invention described in claim 14, by increasing the cooling effect before stopping the operation of the internal combustion engine, even if the supply of cooling water is stopped due to the stop of the internal combustion engine, It is possible to prevent the surface temperature from overshooting and exceeding the upper limit use temperature.

  According to a fifteenth aspect of the present invention, in the marine thermoelectric power generation system according to any one of the first to thirteenth aspects, the temperature control means until the cooling water supply reaches a predetermined condition after the operation of the internal combustion engine is stopped. It is characterized by continuing. According to the fifteenth aspect of the present invention, after the operation of the internal combustion engine is stopped, the surface temperature of the high temperature portion of the thermoelectric power generation element can overshoot so as not to exceed the use upper limit temperature.

  In the ship corresponding to this invention of Claim 16, the thermoelectric power generation system for ships in any one of Claims 1-15 was mounted. According to the sixteenth aspect of the present invention, a marine thermoelectric power generation that can maintain a stable and long-term power generation operation using exhaust gas discharged from an internal combustion engine of a ship or cooling water that cools the internal combustion engine. The system is available.

  According to the present invention, by providing the temperature control means for adjusting the cooling water supplied by the mixer means to control the temperature in the high temperature part, the surface temperature of the high temperature part of the thermoelectric power generation means is adjusted to an appropriate temperature, Stable and long-term power generation operation can be maintained, and thermoelectric power generation means are provided upstream of the mixing means, so that the high-temperature part can generate power without being affected by a decrease in exhaust gas temperature. Become.

  Further, when controlling the temperature control means based on the upper limit temperature of use of the thermoelectric power generation means, the surface temperature of the high temperature portion of the thermoelectric power generation means can be adjusted to an appropriate temperature according to the specifications of the thermoelectric power generation means used. it can.

  Further, when the temperature control means includes a temperature detection means for detecting the temperature in the high temperature part and the temperature control means controls the mixer means based on the detected value of the temperature detection means and the upper limit temperature for use, the thermoelectric power generation means is set to the upper limit temperature for use. A stable long-term power generation operation can be maintained without being exposed to a high temperature exceeding.

  Moreover, when the temperature control means controls the power generation output of the thermoelectric power generation means by adjusting the temperature difference between the high temperature part and the low temperature part at a temperature equal to or lower than the use upper limit temperature, the power generation amount can be improved.

  Further, when the mixer means has an opening that opens to the exhaust gas path upstream of the thermoelectric power generation means, and the cooling water is injected from the opening in the flow direction of the exhaust gas, the temperature of the exhaust gas is quickly increased. In addition to being able to reduce, the flow of exhaust gas is not hindered, thereby preventing adverse effects on the internal combustion engine.

  Further, the opening has a porous structure, and when the cooling water is injected in a shower shape, the temperature of the exhaust gas can be further rapidly and uniformly reduced.

  Further, when the cooling water is continuously taken in by the water intake means at least during the operation of the internal combustion engine and continuously discharged after the internal combustion engine is cooled, the cooling water is more stable than the case where the cooling water is circulated. Cooling effect can be obtained.

  In addition, when part of the taken cooling water flows in the cooling water path, the cooling water can be supplied to the mixer means separately from the cooling water flowing in the cooling water path. It can be prevented that the effect is impaired.

  In addition, when the temperature control means controls the flow rate of the cooling water by adjusting the flow rate adjustment valve provided in the cooling water path, the temperature reduction amount of the exhaust gas can be adjusted, so that the thermoelectric power can be reduced without reducing the power generation amount. The surface temperature of the high temperature part of the power generation means can be adjusted to an appropriate temperature.

  Further, when the thermoelectric power generation means is configured by arranging a plurality of thermoelectric power generation elements around the exhaust gas path, and further sandwiching the thermoelectric power generation elements by the cooling water path, the heat reception from the exhaust gas path and the cooling water It is possible to efficiently dissipate heat to the route.

  In addition, when heat transfer fins are provided on the inner surface of the exhaust gas path where the thermoelectric power generation elements are arranged, the amount of heat received from the exhaust gas path can be increased.

  In addition, when a sealing material having compressibility and heat resistance is provided around the thermoelectric power generation element and the sealing material is sandwiched between the exhaust gas path and the cooling water path, the sealing material prevents condensation or salt damage of the thermoelectric power generation element. Can be prevented and durability can be improved. Moreover, since it becomes easy to make the surface pressure concerning each thermoelectric power generation element uniform, electric power generation efficiency can be improved.

  In addition, when the flow direction of the cooling water in the cooling water path is opposite to the flow direction of the exhaust gas in the exhaust gas path, even if a thermoelectric power generation element is provided in the flow direction, the high temperature in each thermoelectric power generation element The temperature difference between the high temperature part and the low temperature part can be made uniform, and the temperature difference between the high temperature part and the low temperature part can be increased, thereby improving the power generation efficiency.

  Further, when the temperature control means adjusts the supply amount of the cooling water before the operation of the internal combustion engine is stopped, by increasing the cooling effect before the operation of the internal combustion engine is stopped, Even if the supply of the cooling water is stopped, the surface temperature of the high temperature portion of the thermoelectric power generation element can be overshooted so as not to exceed the upper limit use temperature.

  In addition, when the temperature control means continues the cooling water supply until the predetermined condition is reached after the operation of the internal combustion engine is stopped, the surface temperature of the high temperature portion of the thermoelectric power generation element overshoots after the operation of the internal combustion engine is stopped. The maximum use temperature can be prevented from exceeding.

  Further, according to the ship of the present invention, there is provided a marine thermoelectric power generation system capable of maintaining stable long-term power generation operation using exhaust gas discharged from an internal combustion engine of the ship or cooling water for cooling the internal combustion engine. Available.

The block diagram of the thermoelectric power generation system for ships by embodiment of this invention Cross-sectional view of thermoelectric power generation means of the marine thermoelectric power generation system Longitudinal section of the main part The top view which shows the thermoelectric power generation element and sealing material of the thermoelectric power generation means The block diagram which shows the electrical connection of the thermoelectric power generation element in the same thermoelectric power generation means, and the flow of cooling water / exhaust gas The principal part expanded sectional view and A-A 'sectional view which show the mixer means of the thermoelectric power generation system for ships

  Below, the thermoelectric power generation system for ships by the embodiment of the present invention is explained.

  FIG. 1 is a configuration diagram of a marine thermoelectric power generation system according to an embodiment of the present invention, FIG. 2 is a transverse sectional view of thermoelectric power generation means of the marine thermoelectric power generation system, and FIG. FIG. 4 is a plan view showing the thermoelectric power generation element and the sealing material of the thermoelectric power generation means, and FIG. 5 is a configuration diagram showing the electrical connection of the thermoelectric power generation element and the flow of cooling water / exhaust gas in the thermoelectric power generation means.

  As shown in FIG. 1, the ship 1 is equipped with an internal combustion engine 10. Exhaust gas discharged from the internal combustion engine 10 is discharged outside the ship through an exhaust gas path 20 constituted by an exhaust pipe. Cooling water is supplied to the internal combustion engine 10 from the cooling water passage 30. The cooling water is continuously taken in by the water intake means 31 at least during the operation of the internal combustion engine 10 and is continuously discharged after the internal combustion engine 10 is cooled.

A mixing means 21 is provided downstream of the exhaust gas path 20. In the mixing means 21, the cooling water supplied from the cooling water path 30 is injected into the exhaust gas path 20 to reduce the temperature of the exhaust gas.
A thermoelectric power generation means 40 is provided in the exhaust gas path 20 upstream of the mixing means 21. The thermoelectric power generation means 40 includes a heating block 41, a cooling block 42, and a thermoelectric power generation element 43. The heating block 41 is configured by a part of the exhaust gas path 20, and the cooling block 42 is configured by a part of the cooling water path 30.

  Mixer means 50 is provided in the exhaust gas path 20 upstream of the thermoelectric power generation means 40. In the mixer means 50, the cooling water supplied from the cooling water passage 30 is mixed with the exhaust gas in the exhaust gas passage 20.

The temperature control means 61 controls the flow rate of the cooling water by adjusting the flow rate adjustment valve 33 provided in the cooling water path 30, adjusts the cooling water supplied from the mixer means 50, and controls the exhaust gas flowing through the exhaust gas path 20. The temperature, that is, the temperature in the high temperature portion of the thermoelectric generator 40 is controlled.
Further, the temperature control means 61 controls the flow rate of the cooling water by adjusting the flow rate adjustment valve 34 provided in the cooling water path 30, and adjusts the cooling water supplied to the cooling block 42, so that the thermoelectric power generation means 40 Control the temperature in the low temperature part.
The thermoelectric power generation means 40 is provided with a temperature detection means 62 for detecting the temperature in the high temperature part. The temperature detector 62 may detect the temperature of the exhaust gas flowing through the exhaust gas path 20 upstream of the thermoelectric generator 40 and estimate the temperature of the high temperature portion of the thermoelectric generator 40.

The temperature control means 61 controls the mixer means 50 based on the detected value of the temperature detection means 62 and the use upper limit temperature of the thermoelectric generation element 43, thereby exposing the thermoelectric generation element 43 to a high temperature exceeding the use upper limit temperature. And stable and long-term power generation operation can be maintained.
Further, the temperature control means 61 controls the power generation output of the thermoelectric power generation means 40 by adjusting the temperature difference between the high temperature part and the low temperature part at a temperature equal to or lower than the upper limit use temperature of the thermoelectric power generation element 43, thereby improving the power generation amount. Can be made.
Further, the temperature control means 61 can adjust the flow rate of the cooling water by adjusting the flow rate adjustment valve 34 provided in the cooling water path 30, thereby adjusting the temperature decrease amount of the exhaust gas, thereby reducing the power generation amount. The surface temperature of the high temperature portion of the thermoelectric generator 40 can be adjusted to an appropriate temperature.

Further, the temperature control means 61 is preferably adjusted so that the amount of cooling water supplied to the mixer means 50 and / or the cooling block 42 is increased before the operation of the internal combustion engine 10 is stopped. For example, after the start / stop means 63 for starting and stopping the internal combustion engine 10 is instructed to stop the operation, before the stop control of the internal combustion engine 10 is performed, or until the internal combustion engine 10 actually stops the operation. By outputting a signal to the control means 61, the supply amount of the cooling water can be adjusted to increase before the operation of the internal combustion engine 10 is stopped. By increasing the cooling effect before the operation of the internal combustion engine 10 is stopped, even if the supply of cooling water is stopped due to the stop of the internal combustion engine 10, the surface temperature of the high temperature portion of the thermoelectric power generation element 43 is overshot. The maximum use temperature can be prevented from exceeding.
Further, the temperature control means 61 may continue supplying the cooling water after the operation of the internal combustion engine 10 is stopped until a predetermined condition is satisfied. For example, the start / stop means 63 for starting and stopping the internal combustion engine 10 outputs a signal to the temperature control means 61 when issuing a stop instruction for the internal combustion engine 10, thereby supplying cooling water after the operation of the internal combustion engine 10 is stopped. Can continue until the condition is met. The predetermined condition refers to a predetermined time or the temperature of the high temperature portion of the thermoelectric generator 43 being equal to or lower than a predetermined temperature. By continuing the supply of cooling water after the operation of the internal combustion engine 10 is stopped until a predetermined condition is reached, the surface temperature of the high temperature portion of the thermoelectric power generation element 43 overshoots after the operation of the internal combustion engine 10 is stopped, and the use upper limit temperature is increased. Can not exceed.

The cooling water path 30 is provided with a flow rate adjusting valve 35 for adjusting the flow rate of cooling water to the internal combustion engine 10 and a flow rate adjusting valve 36 for adjusting the flow rate of cooling water to the mixing means 21. These flow rate adjusting valves 35 and 36 are adjusted by a temperature control means 61.
In FIG. 1, the cooling water that has cooled the internal combustion engine 10 is supplied to the mixer means 50 via the flow rate adjustment valve 33 and is supplied to the cooling block 42 via the flow rate adjustment valve 34. The cooling water before being supplied to the water may be branched, supplied to the mixer means 50 via the flow rate adjusting valve 33, and supplied to the cooling block 42 via the flow rate adjusting valve 34. Thus, the cooling water supplied to the mixer means 50 or the cooling block 42 can be used by arbitrarily combining the cooling water after cooling the internal combustion engine 10 or the cooling water before being supplied to the internal combustion engine 10. it can. When the cooling water after cooling the internal combustion engine 10 is supplied to the mixer means 50 and the cooling block 42, the cooling water path 30 can be simplified. In the case of the internal combustion engine 10 of the ship 1, since the cooling water is immediately discharged outside the ship after cooling the internal combustion engine 10 without circulating, the cooling water temperature after cooling the internal combustion engine 10 is not high. Even if it is supplied to the low temperature part of the thermoelectric generator 40, it can be used sufficiently.

  As shown in FIGS. 2 and 3, heat transfer fins 22 are provided on the inner surface of the heating block 41 constituting the exhaust gas path 20. Each heat transfer fin 22 is erected from the inner surface of the heating block 41 toward the center of the exhaust gas path 20 and has a height downstream from the upstream. Between each heat transfer fin 22, a flow path through which exhaust gas flows is formed. By providing the heat transfer fins 22, the amount of heat received from the exhaust gas path 20 can be increased.

The thermoelectric power generation means 40 is configured by arranging a plurality of thermoelectric power generation elements 43 around the exhaust gas path 20 and further sandwiching the thermoelectric power generation elements 43 by a cooling block 42 with a spring.
The thermoelectric power generation element 43 has a high temperature part on one side and a low temperature part on the other side, and receives heat from the heating block 41 (exhaust gas path 20) at the high temperature part, and a cooling block 42 (cooling water path 30) at the low temperature part. Power is generated by dissipating heat.
The thermoelectric power generation element 43 is efficiently sandwiched between the exhaust gas path 20 and the cooling water path 30, and thus can efficiently receive heat from the exhaust gas path 20 and release heat to the cooling water path 30.

  As shown in FIGS. 3 and 4, a seal material 44 having compressibility and heat resistance is provided around the thermoelectric power generation element 43. The sealing material 44 is sandwiched between the heating block 41 and the cooling block 42. By providing the sealing material 44, the adhesiveness of the thermoelectric power generation element 43 to the heating block 41 and the cooling block 42 can be increased, condensation or salt damage of the thermoelectric power generation element 43 can be prevented, and durability performance can be improved. In addition, the surface pressure applied to each thermoelectric power generation element 43 can be easily made uniform, and the power generation efficiency can be increased.

  As shown in FIG. 5, in the marine thermoelectric power generation system of the present embodiment, three thermoelectric power generation elements 43 are used in the exhaust gas flow direction and eight in the circumferential direction. The flow direction of the cooling water in the cooling water path 30 is opposed to the flow direction of the exhaust gas in the exhaust gas path 20. Even when the thermoelectric power generation elements 43 are provided in the exhaust gas flow direction by facing the flow direction of the cooling water in the cooling water path 30 and the flow direction of the exhaust gas in the exhaust gas path 20, the respective thermoelectric power generation elements 43. The temperature difference between the high-temperature part and the low-temperature part can be made uniform, and the temperature difference between the high-temperature part and the low-temperature part can be increased, thereby improving the power generation efficiency.

As shown in FIG. 6, the mixer means 50 has an inlet 51 for introducing cooling water from the cooling water path 30, a ring-shaped space 52, and an opening 53 that opens to the exhaust gas path 20.
The ring-shaped space 52 is formed in a ring shape on the outer periphery of the exhaust gas path 20. A large number of openings 53 are provided in a ring shape, and the cooling water is injected in the flow direction of the exhaust gas.
The cooling water is guided from the inlet 51 to the ring-shaped space 52 and is injected from the opening 53 to the exhaust gas path 20.
By injecting the cooling water from a large number of openings 53 provided in a ring shape in the flow direction of the exhaust gas, the temperature of the exhaust gas can be quickly reduced and the flow of the exhaust gas is not hindered. The adverse effect of increasing the load can be prevented. The opening 53 has a porous structure, and it is preferable to spray the cooling water in a shower shape. The temperature of the exhaust gas can be further rapidly reduced by spraying in a shower form.

As described above, the marine thermoelectric power generation system according to the present embodiment includes the temperature control unit 61 that controls the temperature in the high temperature part by adjusting the cooling water supplied by the mixer unit 50, and thus the thermoelectric power generation unit 40. The surface temperature of the high temperature part can be adjusted to an appropriate temperature, and stable long-term power generation operation can be maintained.
Further, by controlling the temperature control means 61 based on the upper limit temperature of use of the thermoelectric power generation element 43 used in the thermoelectric power generation means 40, the surface temperature of the high temperature portion of the thermoelectric power generation means 40 according to the specifications of the thermoelectric power generation element 43 to be used. Can be adjusted to an appropriate temperature.

  By mounting the marine thermoelectric power generation system of the present invention, it is possible to maintain a stable long-term power generation operation using exhaust gas discharged from the internal combustion engine of the ship or cooling water for cooling the internal combustion engine.

DESCRIPTION OF SYMBOLS 1 Ship 10 Internal combustion engine 20 Exhaust gas path 30 Cooling water path 31 Water intake means 33 Flow rate adjustment valve 34 Flow rate adjustment valve 40 Thermoelectric power generation means 41 Heating block 42 Cooling block 43 Thermoelectric power generation element 44 Sealing material 50 Mixer means 51 Opening 61 Temperature control Means 62 Temperature detection means 63 Start / stop means

Claims (16)

An exhaust gas path through which exhaust gas discharged from the internal combustion engine of the ship passes,
A cooling water path through which the cooling water for cooling the internal combustion engine passes;
Mixing means provided in the exhaust gas path for injecting the cooling water and lowering the temperature of the exhaust gas;
Thermoelectric power generation means provided on the upstream side of the mixing means for receiving heat from the exhaust gas path at a high temperature part and generating heat by radiating heat to the cooling water path at a low temperature part;
Mixer means provided on the upstream side of the thermoelectric power generating means for mixing the cooling water with the exhaust gas in the exhaust gas path;
A marine thermoelectric power generation system comprising: temperature control means for controlling the temperature in the high temperature section by adjusting the cooling water supplied by the mixer means.   The marine thermoelectric power generation system according to claim 1, wherein the temperature control unit is controlled based on a use upper limit temperature of the thermoelectric power generation unit.   3. A temperature detection means for detecting the temperature in the high temperature part, wherein the temperature control means controls the mixer means based on a detection value of the temperature detection means and the use upper limit temperature. The marine thermoelectric power generation system described in 1.   The said temperature control means adjusts the temperature difference of the said high temperature part and the said low temperature part at the temperature below the said use upper limit temperature, and controls the electric power generation output of the said thermoelectric power generation means, The Claim 2 or Claim characterized by the above-mentioned. 3. The marine thermoelectric power generation system according to 3.   The said mixer means has an opening part opened to the said exhaust gas path | route upstream from the said thermoelectric power generation means, The said cooling water is injected in the flow direction of the said exhaust gas from the said opening part. The marine thermoelectric power generation system according to any one of claims 1 to 4.   The marine thermoelectric power generation system according to claim 5, wherein the opening has a porous structure, and the cooling water is injected in a shower shape.   7. The cooling water according to claim 1, wherein the cooling water is continuously taken in by a water intake means at least during operation of the internal combustion engine, and is continuously discharged after the internal combustion engine is cooled. The marine thermoelectric power generation system described in 1.   The marine thermoelectric power generation system according to claim 7, wherein a part of the taken cooling water is branched and flowed in the cooling water path.   The marine thermoelectric power generation according to any one of claims 1 to 8, wherein the temperature control means controls a flow rate of the cooling water by adjusting a flow rate adjusting valve provided in the cooling water path. system.   The thermoelectric power generation means is configured by arranging a plurality of thermoelectric power generation elements around the exhaust gas path, and further sandwiching the thermoelectric power generation element between the cooling water paths. A marine thermoelectric power generation system according to any one of the above.   The marine thermoelectric power generation system according to claim 10, wherein a heat transfer fin is provided on an inner surface of the exhaust gas path in which the thermoelectric power generation element is disposed.   The sealing material having compressibility and heat resistance is provided around the thermoelectric power generation element, and the sealing material is sandwiched between the exhaust gas path and the cooling water path. The thermoelectric power generation system for ships described.   The marine thermoelectric device according to any one of claims 10 to 12, wherein a flow direction of the cooling water in the cooling water passage is opposed to a flow direction of the exhaust gas in the exhaust gas passage. Power generation system.   The marine thermoelectric power generation system according to any one of claims 1 to 13, wherein the temperature control means adjusts the supply amount of the cooling water to be increased before the operation of the internal combustion engine is stopped.   The marine thermoelectric power generation system according to any one of claims 1 to 13, wherein the temperature control means continues the supply of the cooling water until a predetermined condition is satisfied after the operation of the internal combustion engine is stopped. A marine vessel equipped with the marine thermoelectric power generation system according to any one of claims 1 to 15.