Ship

Abstract

To provide a ship which simplifies equipment in a hull, and which improves an arrangement formation property of devices.SOLUTION: A ship includes: a hull; a thermal engine provided in the hull; a first circulation system in which a primary medium heated by the thermal engine circulates; a second circulation system in which a secondary medium for heat-exchanging with the primary medium circulates; a fuel tank for storing a liquid gas as a fuel of the thermal engine; a fuel supply system for allowing the fuel from the fuel tank and the secondary medium circulating in the second circulation system to heat-exchange, and for supplying the fuel after heat-exchange to the thermal engine; a heating medium heater provided in the hull, and for heating a heating medium; and a heating medium circulation system for circulating the heating medium heated in the heating medium heater, and for allowing it to heat-exchange with the primary medium circulating in the first circulation system.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a ship.

Background Art

[0002] Patent Document 1 discloses an LNG (Liquefied Natural Gas) vaporization system for ships. In this LNG vaporization system, an LNG vaporizer and an LNG pressurized vaporizer are arranged on a cooling water flow path for engine cooling. LNG is vaporized by heat exchange with engine cooling water.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in a liquefied gas vaporization system as described in Patent Document 1, for example, when the waste heat of the engine is small and it is difficult to raise the temperature of the engine cooling water, the liquefied gas cannot be sufficiently vaporized. Therefore, it is necessary to separately provide an auxiliary heater for heating the liquefied gas.

[0005] In addition, in a fuel tank for storing liquefied gas, evaporated gas (BOG: Boil Off Gas) is generated due to the evaporation of the stored liquefied gas by natural heat input. In order to maintain the pressure of the fuel tank, it is necessary to process BOG. Therefore, for example, a dedicated gas combustion facility (GCU: Gas Combustion Unit) for BOG may be provided. However, the arrangement space of the hull is limited, and when large facilities such as GCU are arranged, it becomes difficult to arrange other devices.

[0006] In addition, there is also a method of burning and treating BOG in a boiler. However, in this method, in order to cool the surplus heat medium (steam in the case of a steam boiler) generated by the combustion of BOG, a large-capacity cooler is required. Furthermore, an additional dump valve and an enhancement of the cooling fresh water system or the cooling seawater system are also necessary. As a result, it leads to a significant increase in equipment and the complication of the engine plant.

[0007] The present disclosure has been made to solve the above problems, and an object thereof is to provide a ship that simplifies the equipment in the hull and improves the feasibility of equipment arrangement.

Means for Solving the Problems

[0008] In order to solve the above problems, a ship according to the present disclosure includes a hull, a heat engine provided in the hull, a first circulation system through which a primary medium heated by the heat engine circulates, a second circulation system in which a secondary medium that exchanges heat with the primary medium circulates, a fuel tank that stores liquefied gas as fuel for the heat engine, a fuel supply system that exchanges heat between the fuel from the fuel tank and the secondary medium flowing through the second circulation system and supplies the heat-exchanged fuel to the heat engine, a heat medium heater provided in the hull that heats the heat medium, and a heat medium circulation system that circulates the heat medium heated by the heat medium heater and exchanges heat with the primary medium flowing through the first circulation system.

Effects of the Invention

[0009] According to the ship of the present disclosure, the equipment in the hull can be simplified and the feasibility of equipment arrangement can be improved.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Mode for Carrying Out the Invention

[0011] (Configuration of the ship) Hereinafter, the ship 1 according to the embodiment of the present disclosure will be described with reference to FIGS. 1 and 2. As shown in FIG. 1, the ship 1 includes a hull 2 and an engine plant 10. The ship 1 is capable of sailing by a main engine or the like using liquefied gas G1 as fuel G. Note that the ship type of the ship 1 is not limited to a specific ship type.

[0012] (Hull) The hull 2 includes a hull body 3, an upper structure 7, and a funnel 8. The hull body 3 is formed to float on seawater. The hull body 3 has a bow 3a, a stern 3b, a side 4, a bottom 5, and an exposed deck 6. A pair of sides 4 are provided facing each other on the left and right so as to connect the bow 3a and the stern 3b. The bottom 5 connects the bow 3a and the stern 3b and also connects the lower ends of the pair of sides 4. The exposed deck 6 connects the bow 3a and the stern 3b and also connects the upper ends of the pair of sides 4.

[0013] The upper structure 7 is formed on the exposed deck 6. Living quarters and the like are provided in the upper structure 7. The funnel 8 is formed on the exposed deck 6. In order to discharge the exhaust gas of the engine plant 10 described later to the outside of the hull 2, a pipe extending from the engine plant 10 is disposed in the funnel 8.

[0014] (Engine plant) The engine plant 10 is provided in the hull body 3. As shown in FIG. 2, the engine plant 10 includes a heat engine 11, a first circulation system 20, a secondary medium heater 12, a second circulation system 30, a fuel tank 13, a fuel supply system 14, a vapor gas system 15, a heat medium heater 16, and a heat medium circulation system 40.

[0015] (Heat engine) The heat engine 11 is provided inside the hull 2. The heat engine 11 is a main engine or an auxiliary engine that uses, as fuel, the vaporized liquefied gas G1 stored in a fuel tank 13 described later. The waste heat generated by the heat engine 11 is used to heat a primary medium M1 flowing through a first circulation system 20 described later.

[0016] (First Circulation System) In the first circulation system 20, a primary medium M1 heated by the heat engine 11 flows. In FIG. 2, the flow direction of the primary medium M1 in the first circulation system 20 is illustrated by an arrow. Hereinafter, in the description related to the first circulation system 20, the upstream side in the flow direction of the primary medium M1 may be simply referred to as the upstream side, and the downstream side in the flow direction of the primary medium M1 may be simply referred to as the downstream side.

[0017] In the present embodiment, cooling fresh water is used as the primary medium M1. The first circulation system 20 includes a primary medium flow path 21, a pump 22, a primary medium cooler 23, and valves 24, 25, 26.

[0018] (Primary Medium Flow Path) The primary medium flow path 21 circulates the primary medium M1. Various devices such as the heat engine 11, a pump 22 described later, a primary medium cooler 23, valves 24, 25, 26, a secondary medium heater 12, and a heat medium cooler 45 are provided in the primary medium flow path 21. The primary medium flow path 21 includes a heat engine cooling flow path 21a and bypass flow paths 21b, 21c.

[0019] The heat engine cooling flow path 21a is annularly arranged so as to pass through the heat engine 11. The heat engine cooling flow path 21a circulates the primary medium M1 and cools the heat engine 11 with the primary medium M1. In the heat engine cooling flow path 21a, with the pump 22 being the most upstream side, the pump 22, valve 25, heat engine 11, secondary medium heater 12, and valve 24 are annularly arranged in this order.

[0020] The bypass passage 21b branches off from the valve 24 of the heat engine cooling passage 21a. The bypass passage 21b is disposed between the valve 24 and the pump 22 in the heat engine cooling passage 21a and returns to the downstream side of the valve 24. A primary medium cooler 23 is provided in the bypass passage 21b.

[0021] The valve 24 is a so-called three-way valve. The valve 24 can switch the primary medium passage 21 so that the primary medium M1 passes through the primary medium cooler 23. Conversely, the valve 24 can switch the primary medium passage 21 so that the primary medium M1 does not pass through the primary medium cooler 23.

[0022] The bypass passage 21c branches off from a region on the downstream side of the pump 22 between the pump 22 and the valve 25 in the heat engine cooling passage 21a. The bypass passage 21c is disposed between the valve 25 and the heat engine 11 in the heat engine cooling passage 21a and returns to the downstream side of the valve 25. The valve 25 is provided to open and close the heat engine cooling passage 21a. In addition, a heat medium cooler 45 is provided in the bypass passage 21c. Valves 26 are provided upstream and downstream of the heat medium cooler 45 in the bypass passage 21c, respectively. The valve 26 is provided to open and close the bypass passage 21c.

[0023] By closing the valve 25 and opening the valve 26, the primary medium passage 21 can be switched so that the primary medium M1 passes through the heat medium cooler 45. Conversely, by opening the valve 25 and closing the valve 26, the primary medium passage 21 can be switched so that the primary medium M1 does not pass through the heat medium cooler 45.

[0024] The pump 22 pumps the primary medium M1 and circulates it within the first circulation system 20. The pump 22 is provided upstream of the heat engine 11 in the flow direction of the primary medium M1.

[0025] (Primary medium cooler) The primary medium cooler 23 is provided upstream of the pump 22 in the flow direction of the primary medium M1. The primary medium cooler 23 cools the primary medium M1 before it is supplied to the heat engine 11. The primary medium cooler 23 of the present embodiment takes in seawater W from the outside and exchanges heat between the seawater W and the primary medium M1. Thereby, the primary medium M1 is cooled.

[0026] (Secondary medium heater) The secondary medium heater 12 is provided across the first flow system 20 and a second flow system 30 described later. The secondary medium heater 12 is between the heat engine 11 and the primary medium cooler 23 in the first flow system 20 and is provided downstream of the heat engine 11 in the flow direction of the primary medium M1. The secondary medium heater 12 exchanges heat between the primary medium M1 heated by the heat engine 11 and the secondary medium M2 flowing through the second flow system 30 to heat the secondary medium M2. Note that in the secondary medium heater 12, the primary medium M1 is cooled.

[0027] (Second flow system) In the second flow system 30, the secondary medium M2 that exchanges heat with the primary medium M1 circulates. In FIG. 2, the flow direction of the secondary medium M2 in the second flow system 30 is illustrated by an arrow. Hereinafter, in the description related to the second flow system 30, the upstream side in the flow direction of the secondary medium M2 may be simply referred to as the upstream side, and the downstream side in the flow direction of the secondary medium M2 may be simply referred to as the downstream side.

[0028] In the present embodiment, an antifreeze is used as the secondary medium M2. The second flow system 30 includes a secondary medium flow path 31, a pump 32, a vaporizer 33, a gas heater 34, and a valve 35.

[0029] (Secondary medium flow path) The secondary medium flow path 31 is a circulation flow path for circulating the secondary medium M2. Various devices such as a secondary medium heater 12, the secondary medium flow path 31, a pump 32, a vaporizer 33, a gas heater 34, and a valve 35, which will be described later, are provided in the secondary medium flow path 31. The secondary medium flow path 31 has a vaporization flow path 31a, a gas heating flow path 31b, and a bypass flow path 31c.

[0030] The vaporization flow path 31a is annularly arranged so as to circulate the secondary medium M2. A secondary medium heater 12, a pump 32, a vaporizer 33, and a valve 35 are provided in the vaporization flow path 31a. In the vaporization flow path 31a, with the secondary medium heater 12 being the most upstream, the secondary medium heater 12, the valve 35, the pump 32, and the vaporizer 33 are annularly arranged in this order.

[0031] The gas heating flow path 31b is between the pump 32 and the vaporizer 33 in the vaporization flow path 31a and branches from the downstream side with respect to the pump 32. And the gas heating flow path 31b is between the vaporizer 33 and the secondary medium heater 12 in the vaporization flow path 31a and is arranged so as to return to the downstream side with respect to the vaporizer 33. A gas heater 34 is provided in the gas heating flow path 31b.

[0032] The bypass flow path 31c is between the downstream end of the gas heating flow path 31b and the secondary medium heater 12 in the vaporization flow path 31a and branches from the further downstream side with respect to the downstream end of the gas heating flow path 31b. And the bypass flow path is connected to the valve 35 and is arranged so as to return to the vaporization flow path 31a via the valve 35.

[0033] The valve 35 is a so-called three-way valve. The valve 35 can switch the secondary medium flow path 31 so that the secondary medium M2 passes through the secondary medium heater 12. Conversely, the valve 35 can also switch the secondary medium flow path 31 so that the secondary medium M2 does not pass through the secondary medium heater 12.

[0034] The pump 32 pumps the secondary medium M2 and circulates it within the second flow system 30. In the present embodiment, the pump 32 is provided on the downstream side in the flow direction of the secondary medium M2 with respect to the secondary medium heater 12.

[0035] (Vaporizer) The vaporizer 33 causes heat exchange between the liquefied gas G1 stored in the fuel tank 13 described later and the secondary medium M2 to vaporize the liquefied gas G1. The vaporizer 33 is provided on the downstream side in the flow direction of the secondary medium M2 with respect to the pump 32.

[0036] (Gas heater) The gas heater 34 causes heat exchange between the evaporation gas G2 (BOG: Boil Off Gas) generated by the evaporation of the liquefied gas G1 due to natural heat input into the fuel tank 13 and the secondary medium M2 to heat the evaporation gas G2. The gas heater 34 is arranged in parallel with the vaporizer 33 and is provided on the downstream side in the flow direction of the secondary medium M2 with respect to the pump 32.

[0037] (Fuel tank) The fuel tank 13 stores the liquefied gas G1 as the fuel G for the heat engine 11. The liquefied gas G1 stored in the fuel tank 13 of the present embodiment is LNG (Liquefied Natural Gas).

[0038] (Fuel supply system) The fuel supply system 14 causes heat exchange between the fuel G from the fuel tank 13 and the secondary medium M2 flowing through the second flow system 30, and supplies the heat-exchanged fuel G to the heat engine 11. In FIG. 2, the flow direction of the fuel G in the fuel supply system 14 is illustrated by an arrow. Hereinafter, in the description regarding the fuel supply system 14, the upstream side in the flow direction of the fuel G may be simply referred to as the upstream side, and the downstream side in the flow direction of the fuel G may be simply referred to as the downstream side for explanation.

[0039] The fuel supply system 14 has a fuel flow path 14a, a pump 17, and a flow rate adjustment unit 18. The fuel flow path 14a connects the fuel tank 13 and the heat engine 11 and allows the fuel G to flow through. Also, a pump 17 for pumping the liquefied gas G1 (fuel G) in the fuel tank 13 is provided at the upstream end of the fuel flow path 14a. In the present embodiment, the pump 17 is provided inside the fuel tank 13.

[0040] In the middle part of the fuel flow path 14a, the above-described vaporizer 33 is provided. The liquefied gas G1 (fuel G) flowing through the fuel supply system 14 is forcibly vaporized by the vaporizer 33. The fuel G vaporized in this way is supplied to the heat engine 11. The heat engine 11 operates by burning the fuel G supplied from the fuel supply system 14. At this time, waste heat is generated from the heat engine 11, and this waste heat of the heat engine 11 is supplied to the primary medium M1 flowing through the above-described first flow system 20.

[0041] Also, the flow rate adjustment unit 18 is provided between the vaporizer 33 and the heat engine 11 in the fuel flow path 14a. The flow rate adjustment unit 18 is a so-called GVU (Gas Valve Unit). The flow rate adjustment unit 18 adjusts the flow rate of the fuel G flowing through the fuel supply system 14 according to the load of the heat engine 11. Thereby, the heat engine 11 is always supplied with the fuel G at a stable pressure (gas pressure).

[0042] (Evaporated gas system) Due to the natural heat input to the fuel tank 13, the liquefied gas G1 evaporates, and evaporated gas G2 (BOG) is generated from the fuel tank 13. The evaporated gas system 15 discharges this evaporated gas G2 outside the fuel tank 13 and supplies it to a heat medium heater 16 described later. In FIG. 2, the flow direction of the evaporated gas G2 in the evaporated gas system 15 is illustrated by an arrow. Hereinafter, in the description related to the evaporated gas system 15, the upstream side in the flow direction of the evaporated gas G2 may be simply referred to as the upstream side, and the downstream side in the flow direction of the evaporated gas G2 may be simply referred to as the downstream side for explanation.

[0043] The evaporation gas system 15 has an evaporation gas flow path 15a and a flow rate adjustment unit 19. The evaporation gas flow path 15a connects the fuel tank 13 and the heat medium heater 16.

[0044] In the middle part of the evaporation gas flow path 15a, the above-described gas heater 34 is provided. The evaporation gas G2 flowing through the evaporation gas system 15 is heated by the gas heater 34. The evaporation gas G2 heated in this way is supplied to the heat medium heater 16.

[0045] Also, the flow rate adjustment unit 19 is provided between the gas heater 34 and the heat medium heater 16 in the evaporation gas flow path 15a. The flow rate adjustment unit 19 is a so-called GVU. The flow rate adjustment unit 19 adjusts the flow rate of the evaporation gas G2 flowing through the evaporation gas system 15 according to the load of the heat medium heater 16. Thereby, the heat medium heater 16 is always supplied with the evaporation gas G2 at a stable pressure (gas pressure).

[0046] (Heat medium heater) The heat medium heater 16 is provided inside the hull 2. The heat medium heater 16 of the present embodiment is a boiler that uses water as the heat medium M3. The heat medium heater 16 heats the heat medium M3 to generate steam. The heat medium M3 (steam in the present embodiment) heated by the heat medium heater 16 is supplied to the operation unit 42 via the heat medium circulation system 40 described later.

[0047] The heat medium heater 16 heats the heat medium M3 by burning another fuel G3 supplied from the outside or the like. Further, when the evaporation gas G2 is supplied from the fuel tank 13 via the evaporation gas system 15, the heat medium heater 16 burns the evaporation gas G2 to heat the heat medium M3.

[0048] (Heat medium circulation system) The heat medium circulation system 40 circulates the heat medium M3 heated by the heat medium heater 16 and exchanges heat with the primary medium M1 flowing through the first circulation system 20. In FIG. 2, the flow direction of the heat medium M3 in the heat medium circulation system 40 is illustrated by an arrow. Hereinafter, in the description of the heat medium circulation system 40, the upstream side in the flow direction of the heat medium M3 may be simply referred to as the upstream side, and the downstream side in the flow direction of the heat medium M3 may be simply referred to as the downstream side for explanation.

[0049] The heat medium circulation system 40 includes a heat medium flow path 41, an operation unit 42, a heat medium tank 43, a valve 44, and a heat medium cooler 45.

[0050] (Heat medium flow path) The heat medium flow path 41 circulates the heat medium M3. The heat medium flow path 41 is provided with an operation unit 42, a heat medium tank 43, a valve 44, and a heat medium cooler 45, which will be described later. The heat medium flow path 41 includes a feed flow path 41a, a return flow path 41b, and a bypass flow path 41c.

[0051] The feed flow path 41a is connected to the heat medium heater 16 and the operation unit 42. The feed flow path 41a supplies the heat medium M3 heated by the heat medium heater 16 to the operation unit 42.

[0052] The return flow path 41b is connected to the operation unit 42 and the heat medium heater 16. The return flow path 41b returns the heat medium M3 that has passed through the operation unit 42 to the heat medium heater 16. A heat medium tank 43 is provided on the downstream side of the operation unit 42 in the return flow path 41b.

[0053] The bypass flow path 41c branches off from the feed flow path 41a. Then, the bypass flow path 41c is connected to the heat medium tank 43 and is arranged to return to the return flow path 41b via the heat medium tank 43. In the bypass flow path 41c, with the valve 44 being the most upstream side, the valve 44 and the heat medium cooler 45 are arranged in this order.

[0054] The valve 44 is provided to be able to open and close the bypass flow path 41c.

[0055] (Operation unit) The operating unit 42 is a device that operates using the heat of the heat medium M3 heated by the heat medium heater 16 as energy. In the illustrated example, only one operating unit 42 is shown, but it is not limited to this. A plurality of operating units 42 may be provided in series or in parallel. The operating unit 42 is provided on the downstream side in the flow direction of the heat medium M3 with respect to the heat medium heater 16. The heat medium M3 is cooled by the operating unit 42. In the present embodiment, the operating unit 42 functions as a condenser. That is, the heat medium M3 is cooled by the operating unit 42 and changes from steam to liquid water.

[0056] (Heat medium tank) The heat medium tank 43 stores the heat medium M3 cooled by the operating unit 42. In the present embodiment, the heat medium tank 43 stores liquid water. The heat medium tank 43 is provided on the downstream side in the flow direction of the heat medium M3 with respect to the operating unit 42. The heat medium M3 stored in the heat medium tank 43 is returned to the heat medium heater 16 via the return flow path 41b.

[0057] (Heat medium cooler) The heat medium cooler 45 cools the heat medium M3 by exchanging heat with the primary medium M1. This heat medium cooler 45 is connected to the first flow system 20 via the bypass flow path 21c. The heat medium cooler 45 is between the heat engine 11 and the secondary medium heater 12 in the first flow system 20 and is connected upstream of the heat engine 11 in the flow direction of the secondary medium M2. When supplying the primary medium M1 to the heat medium cooler 45, the valve 44 in the bypass flow path 41c is in an open state.

[0058] The heat medium cooler 45 cools the excess of the heat medium M3 heated by the heat medium heater 16. The heat medium cooler 45 of the present embodiment is a so-called drain cooler and functions as a condenser. That is, the heat medium M3 is cooled by the heat medium cooler 45 and changes from steam to liquid water.

[0059] The heat medium M3 cooled by the heat medium cooler 45 is temporarily stored in the heat medium tank 43. Thereafter, the heat medium M3 is returned from the heat medium tank 43 to the heat medium heater 16 via the return flow path 41b.

[0060] In the heat medium cooler 45, while the heat medium M3 is cooled, the primary medium M1 is pre-heated by the heat of the heat medium M3 before being supplied to the heat engine 11. That is, the heat medium cooler 45 functions as a heater for heating the primary medium M1 in the primary circulation system.

[0061] (Function and effect) In the ship 1 with the above configuration, the following function and effect can be exhibited.

[0062] The ship 1 includes a hull 2, a heat engine 11, a first circulation system 20, a second circulation system 30, a fuel tank 13, a fuel supply system 14, and a heat medium circulation system 40. The heat engine 11 is provided in the hull 2. In the first circulation system 20, the primary medium M1 heated by the heat engine 11 circulates. In the second circulation system 30, the secondary medium M2 that exchanges heat with the primary medium M1 circulates. The fuel tank 13 stores the liquefied gas G1 as the fuel G of the heat engine 11. The fuel supply system 14 exchanges heat between the fuel G from the fuel tank 13 and the secondary medium M2 flowing through the second circulation system 30, and supplies the heat-exchanged fuel G to the heat engine 11. The heat medium heater 16 is provided in the hull 2 and heats the heat medium M3. The heat medium circulation system 40 circulates the heat medium M3 heated by the heat medium heater 16 and exchanges heat with the primary medium M1 flowing through the first circulation system 20.

[0063] The secondary medium M2 requires a large amount of heat to vaporize the liquefied gas G1 as the fuel G. According to the above configuration, not only the waste heat of the heat engine 11 but also the heat of the heat medium M3 heated by the heat medium heater 16 can be used to heat the primary medium M1. Thereby, even in a situation where the waste heat of the heat engine 11 is insufficient, the secondary medium M2 can be heated by the heat exchange between the primary medium M1 and the secondary medium M2, and sufficient heat for vaporizing the liquefied gas G1 can be supplied to the secondary medium M2. For this reason, an auxiliary heater for auxiliary heating of the secondary medium M2 can be omitted.

[0064] In addition, the surplus heat medium M3 can be cooled by the heat of the primary medium M1. Therefore, there is no need to separately provide a cooling water system for introducing seawater or another cooling fresh water to cool the surplus heat medium M3.

[0065] As described above, the auxiliary heater and the cooling water system can also be omitted, and the equipment (engine plant 10) in the hull 2 can be simplified. By simplifying the engine plant 10, various devices can be freely arranged in the limited space. That is, the feasibility of arranging the devices in the engine plant 10 can be improved.

[0066] The heat medium heater 16 burns the evaporation gas G2 generated by the evaporation of the liquefied gas G1 due to the natural heat input into the fuel tank 13 to heat the heat medium M3.

[0067] Thereby, the heat medium heater 16 can heat the heat medium M3 by using the evaporation gas G2 (BOG). Therefore, the energy efficiency of the entire ship 1 can be improved.

[0068] The heat medium circulation system 40 has a heat medium cooler 45 that cools the heat medium M3 by exchanging heat with the primary medium M1, and returns the heat medium M3 cooled by the heat medium cooler 45 to the heat medium heater 16.

[0069] Thereby, the heat medium M3 cooled by exchanging heat with the primary medium M1 can be returned to the heat medium heater 16, heated by the heat medium heater 16, and reused.

[0070] The ship 1 further includes a secondary medium heater 12. The secondary medium heater 12 is provided across the first circulation system 20 and the second circulation system 30, and heats the secondary medium M2 by exchanging heat between the primary medium M1 heated by the heat engine 11 and the secondary medium M2. The heat medium cooler 45 is between the heat engine 11 and the secondary medium heater 12 in the first circulation system 20, and is connected upstream of the heat engine 11 in the flow direction of the secondary medium M2.

[0071] In the secondary medium heater 12, heat is taken from the primary medium M1 to heat the secondary medium M2, and the primary medium M1 is cooled. Then, the primary medium M1 is supplied to the heat engine 11, and the primary medium M1 is heated by the waste heat of the heat engine 11. According to this embodiment, heat exchange can be performed between the primary medium M1 before being heated by the heat engine 11 and the heat medium M3 to cool the heat medium M3. Thereby, the heat medium M3 can be efficiently cooled.

[0072] The heat medium cooler 45 cools the surplus of the heat medium M3 heated by the heat medium heater 16.

[0073] The surplus of the heat medium M3 heated by the heat medium heater 16 cannot be directly returned to the heat medium heater 16. Therefore, a cooler for cooling the surplus heat medium M3 is required. Such a cooler is installed in the hull 2 in advance, and according to this embodiment, it is possible to use this cooler for cooling the surplus heat medium M3 as the heat medium cooler 45. That is, since the existing cooler can be used as the heat medium cooler 45, it is possible to further simplify the engine plant 10.

[0074] (Other embodiments) As described above, the embodiments of the present disclosure have been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and design changes and the like within the scope not departing from the gist of the present disclosure are also included.

[0075] In the above-described embodiment, the case where the primary medium M1 is cooling fresh water and the secondary medium M2 is antifreeze has been described, but the types of the primary medium M1 and the secondary medium M2 are not limited to the examples of the embodiment. The types of the primary medium M1 and the secondary medium M2 can be appropriately changed.

[0076] In the above-described embodiment, the embodiment has been described by taking the case where the liquefied gas G1 stored in the fuel tank 13 is LNG as an example, but it is not limited to this. The liquefied gas G1 stored in the fuel tank 13 may be, for example, LPG (Liquefied Petroleum Gas).

[0077] In the above-described embodiment, the case where the heat medium heater 16 is a boiler that uses water as the heat medium M3 has been described, but the present invention is not limited thereto. For example, the heat medium heater 16 may be a heat medium oil boiler that uses heat medium oil as the heat medium M3.

[0078] <Appendix> The ship 1 described in each embodiment is understood as follows, for example.

[0079] (1) The ship 1 according to the first aspect includes a hull 2, a heat engine 11 provided on the hull 2, a first circulation system 20 through which a primary medium M1 heated by the heat engine 11 circulates, a second circulation system 30 through which a secondary medium M2 that exchanges heat with the primary medium M1 circulates, a fuel tank 13 that stores liquefied gas G1 as fuel G for the heat engine 11, and a fuel supply system 14 that exchanges heat between the fuel G from the fuel tank 13 and the secondary medium M2 that circulates through the second circulation system 30, and supplies the heat-exchanged fuel G to the heat engine 11. The ship 1 also includes a heat medium heater 16 provided on the hull 2 that heats a heat medium M3, and a heat medium circulation system 40 that circulates the heat medium M3 heated by the heat medium heater 16 and exchanges heat with the primary medium M1 that circulates through the first circulation system 20.

[0080] The secondary medium M2 requires a large amount of heat to vaporize the liquefied gas G1 as fuel G. According to the above configuration, not only the waste heat of the heat engine 11 but also the heat of the heat medium M3 heated by the heat medium heater 16 can be used to heat the primary medium M1. As a result, even in a situation where the waste heat of the heat engine 11 is insufficient, the secondary medium M2 can be heated by heat exchange between the primary medium M1 and the secondary medium M2, and sufficient heat can be supplied to the secondary medium M2 to vaporize the liquefied gas G1. Therefore, an auxiliary heater for auxiliary heating of the secondary medium M2 can be omitted.

[0081] (2) The ship 1 according to the second aspect is the ship 1 according to the first aspect, and the heat medium heater 16 may heat the heat medium M3 by burning evaporation gas G2 generated by evaporation of the liquefied gas G1 due to natural heat input into the fuel tank 13.

[0082] As a result, the heat medium heater 16 can heat the heat medium M3 by using the evaporation gas G2 (BOG).

[0083] (3) The ship 1 of the third aspect is the ship 1 of the first or second aspect, wherein the heat medium circulation system 40 has a heat medium cooler 45 that cools the heat medium M3 by exchanging heat with the primary medium M1, and the heat medium M3 after being cooled by the heat medium cooler 45 may be returned to the heat medium heater 16.

[0084] As a result, the heat medium M3 that has exchanged heat with the primary medium M1 and been cooled can be returned to the heat medium heater 16, heated by the heat medium heater 16, and reused.

[0085] (4) The ship 1 of the fourth aspect is the ship 1 of the third aspect, and further includes a secondary medium heater 12 that is provided across the first circulation system 20 and the second circulation system 30 and exchanges heat between the primary medium M1 heated by the heat engine 11 and the secondary medium M2 to heat the secondary medium M2. The heat medium cooler 45 may be connected between the heat engine 11 and the secondary medium heater 12 in the first circulation system 20 and on the upstream side in the flow direction of the secondary medium M2 with respect to the heat engine 11.

[0086] In the secondary medium heater 12, heat is taken from the primary medium M1 to heat the secondary medium M2, and the primary medium M1 is in a cooled state. Thereafter, the primary medium M1 is supplied to the heat engine 11, and the primary medium M1 is heated by the waste heat of the heat engine 11. According to this aspect, heat exchange can be performed between the primary medium M1 before being heated by the heat engine 11 and the heat medium M3 to cool the heat medium M3.

[0087] (5) The ship 1 of the fifth aspect is the ship 1 of the third or fourth aspect, and the heat medium cooler 45 may cool the surplus of the heat medium M3 heated by the heat medium heater 16.

[0088] The surplus of the heat medium M3 heated by the heat medium heater 16 cannot be directly returned to the heat medium heater 16. Therefore, a cooler for cooling the surplus heat medium M3 is required. Such a cooler is pre-installed in the hull 2, and according to this embodiment, it is possible to use the cooler for cooling the surplus heat medium M3 as the heat medium cooler 45.

Explanation of Signs

[0089] 1…Ship 2…Hull 3…Hull main body 3a…Bow 3b…Stern 4…Side 5…Bottom 6…Exposed deck 7…Superstructure 8…Funnel 10…Engine plant 11…Heat engine 12…Secondary medium heater 13…Fuel tank 14…Fuel supply system 14a…Fuel flow path 15…Evaporated gas system 15a…Evaporated gas flow path 16…Heat medium heater 17…Pump 18…Flow rate adjustment part 19…Flow rate adjustment part 20…First circulation system 21…Primary medium flow path 21a…Heat engine cooling flow path 21b…Bypass flow path 21c…Bypass flow path 22…Pump 23…Primary medium cooler 24…Valve 25…Valve 26…Valve 30…Second circulation system 31…Secondary medium flow path 31a…Vaporization flow path 31b…Gas heating flow path 31c…Bypass flow path 32…Pump 33…Vaporizer 34…Gas heater 35…Valve 40…Heat medium circulation system 41…Heat medium flow path 41a…Feed flow path 41b…Return flow path 41c…Bypass flow path 42…Operating part 43…Heat medium tank 44…Valve 45…Heat medium cooler G…Fuel G1…Liquefied gas G2…Evaporated gas G3…Fuel M1…Primary medium M2…Secondary medium M3…Heat medium

Claims

1. A hull, a heat engine provided on the hull, a first circulation system through which a primary medium heated by the heat engine circulates, a second circulation system through which a secondary medium that exchanges heat with the primary medium circulates, a fuel tank that stores liquefied gas as fuel for the heat engine, a fuel supply system that exchanges heat between the fuel from the fuel tank and the secondary medium flowing through the second circulation system and supplies the heat-exchanged fuel to the heat engine, a heat medium heater provided on the hull for heating the heat medium, a heat medium circulation system that circulates the heat medium heated by the heat medium heater and exchanges heat with the primary medium flowing through the first circulation system, A ship comprising the above.

2. The heat medium heater burns evaporation gas generated by evaporation of the liquefied gas due to natural heat input into the fuel tank to heat the heat medium. The ship according to Claim 1.

3. The heat medium circulation system has a heat medium cooler that exchanges heat with the primary medium to cool the heat medium, and returns the heat medium cooled by the heat medium cooler to the heat medium heater. The ship according to Claim 1 or Claim 2.

4. Further provided is a secondary medium heater provided across the first circulation system and the second circulation system, which exchanges heat between the primary medium heated by the heat engine and the secondary medium to heat the secondary medium. The heat medium cooler is between the heat engine and the secondary medium heater in the first circulation system and is connected upstream of the heat engine in the flow direction of the secondary medium. The ship according to Claim 3.

5. The heat medium cooler cools the surplus of the heat medium heated by the heat medium heater. The ship according to Claim 3.

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