Ship

Abstract

To provide a ship capable of suppressing a drop in exhaust gas temperature after cleaning exhaust gas using the seawater.SOLUTION: A ship comprises a hull, a combustion device provided on the hull and to burn a fuel, a scrubber to clean the exhaust gas from the combustion device using seawater, a recovery device provided on the hull and to recover carbon dioxide from the exhaust gas via the scrubber, a first seawater intake piping system capable of introducing the seawater into the scrubber from the outside of the hull, and a temperature rising part capable of warming the seawater flowing through the first seawater intake piping system.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to marine vessels. [Background technology]

[0002] Patent Document 1 discloses a marine desulfurization device for desulfurizing exhaust gas discharged from an exhaust gas generation device mounted on a ship. In this marine desulfurization device, seawater or fresh water is sprayed onto the exhaust gas as a cleaning liquid, and the exhaust gas is brought into gas-liquid contact with the cleaning liquid to remove sulfur from the exhaust gas. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-104482 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, when seawater is used as the cleaning fluid in the marine desulfurization device described in Patent Document 1, the temperature of the seawater taken in from outside the ship as the cleaning fluid may become low, for example, at about 5° C., depending on the season and the sea area in which the ship is sailing. When exhaust gas is desulfurized with low-temperature seawater, the temperature of the exhaust gas after desulfurization is also low. If a ship is equipped with a carbon dioxide capture device that captures carbon dioxide contained in exhaust gas, there is a problem that if the exhaust gas after desulfurization is at a low temperature, the capture efficiency when capturing carbon dioxide contained in the exhaust gas decreases.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a ship that can suppress a drop in temperature of exhaust gas after cleaning using seawater. [Means for solving the problem]

[0006] In order to solve the above problems, a ship according to the present disclosure includes a hull, a combustion device, a scrubber, a recovery device, a first seawater inlet piping system, and a heating section. The combustion device is provided on the hull and burns fuel. The scrubber is provided on the hull and cleans exhaust gas from the combustion device with seawater. The recovery device is provided on the hull and recovers carbon dioxide from the exhaust gas that has passed through the scrubber. The first seawater inlet piping system is capable of introducing seawater to the scrubber from outside the hull. The heating section is capable of heating the seawater flowing through the first seawater inlet piping system. Effect of the Invention

[0007] According to the ship of the present disclosure, when the exhaust gas is washed with seawater, a decrease in the temperature of the exhaust gas after washing can be suppressed. [Brief description of the drawings]

[0008] [Figure 1] 1 is a side view showing a schematic configuration of a vessel according to an embodiment of the present disclosure. FIG. [Diagram 2] FIG. 1 is a diagram showing a schematic configuration of a seawater introduction system according to a first embodiment of the present disclosure. [Diagram 3] 1 is a diagram showing a state in which seawater that has passed through a first heat exchanger is sent to a first seawater inlet piping system in a seawater inlet system according to a first embodiment of the present disclosure. FIG. [Figure 4] FIG. 10 is a diagram showing a modified example of the seawater introduction system according to the first embodiment of the present disclosure. [Diagram 5] FIG. 11 is a diagram showing a schematic configuration of a seawater introduction system according to a second embodiment of the present disclosure. [Figure 6] 13 is a diagram showing a state in which seawater that has passed through a first heat exchanger and a second heat exchanger is sent to a first seawater inlet piping system in a seawater inlet system according to a second embodiment of the present disclosure. FIG. [Figure 7] FIG. 13 is a diagram showing a schematic configuration of a seawater introduction system according to a third embodiment of the present disclosure. [Figure 8]13 is a diagram showing a state in which seawater that has passed through a first heat exchanger and a third heat exchanger is sent to a first seawater inlet piping system in a seawater inlet system according to a third embodiment of the present disclosure. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, a vessel according to an embodiment of the present disclosure will be described with reference to FIGS. 1 to 8. FIG. First Embodiment (Overall configuration of the ship) As shown in Fig. 1, the ship 1 of this embodiment includes a hull 2, a combustion device 8, a scrubber 20, a recovery device 30, a seawater introduction system 50A (see Fig. 2), and a heating section 70A (see Fig. 2). The type of the ship 1 of this embodiment is not limited to a specific type of ship. Examples of the type of the ship 1 include a liquefied gas carrier, a ferry, a RORO ship, a car carrier, and a passenger ship.

[0010] (Hull configuration) The hull 2 ​​has a pair of side panels 3A, 3B that form its outer hull, a ship bottom 4, and an upper deck 5. The side panels 3A, 3B have a pair of side panel shells that form the port and starboard sides, respectively. The ship bottom 4 has a ship bottom panel that connects the side panels 3A, 3B. The upper deck 5 is a full-length deck exposed to the outside, and a superstructure 6 having accommodation areas is formed above the upper deck 5.

[0011] The combustion device 8 is a device that generates thermal energy by burning fuel, and is provided inside the hull 2. Examples of the combustion device 8 include an internal combustion engine used in the main engine for propelling the ship 1, an internal combustion engine used in a power generation facility that supplies electricity to the ship, and a boiler that generates steam as a working fluid.

[0012] (Scrubber configuration) The scrubber 20 cleans the exhaust gas discharged from the combustion device 8 with seawater. In this embodiment, the scrubber 20 is illustrated as being provided on the upper deck 5 of the hull 2, for example, but the location of the scrubber 20 is not limited to the upper deck 5. The exhaust gas from the combustion device 8 is introduced into the scrubber 20 via an exhaust gas piping system 101. The scrubber 20 desulfurizes the exhaust gas by bringing seawater supplied from a seawater introduction system 50A, which will be described later, into gas-liquid contact with the exhaust gas from the combustion device 8. The detailed configuration of the scrubber 20 is not limited in any way.

[0013] (Configuration of the recovery device) The capture device 30 is provided on the hull 2 ​​and captures carbon dioxide from the exhaust gas that has passed through the scrubber 20. In this embodiment, the capture device 30 is illustrated as being provided on the upper deck 5 of the hull 2, but the location of the capture device 30 is not limited to being on the upper deck 5.

[0014] The capture device 30 captures carbon dioxide contained in the exhaust gas sent from the scrubber 20 through the exhaust gas pipe 102. For example, a method for capturing carbon dioxide may be a chemical absorption method in which carbon dioxide is absorbed in an absorbing liquid. An example of an absorbing liquid when carbon dioxide is absorbed by the chemical absorption method is MEA (monoethanolamine). The capture device 30 may be provided with an exhaust gas cooling device (quencher) for cooling the exhaust gas sent from the scrubber 20, as necessary. Here, the exhaust gas after the carbon dioxide has been absorbed in the absorbing liquid is released into the atmosphere, for example, through an exhaust funnel (not shown) or the like provided on the ship 1.

[0015] (Configuration of seawater introduction system) FIG. 2 is a diagram showing a schematic configuration of the seawater introduction system according to the first embodiment of the present disclosure. As shown in FIG. 2, the seawater introduction system 50A at least includes a water intake piping system 51, a first seawater introduction piping system 52, a second seawater introduction piping system 53A, a third seawater introduction piping system 54A, a discharge piping system 55, a first heat exchanger 61, and a second heat exchanger 62.

[0016] The water intake piping system 51 takes in seawater from outside the hull 2 ​​into the hull 2. One end of the water intake piping system 51 is connected to a first water intake 56. The first water intake 56 is formed on the ship bottom 4 and opens facing downward. The other end of the water intake piping system 51 is connected to a second water intake 57. The second water intake 57 is formed at a higher position than the first water intake 56. The second water intake 57 in this embodiment is formed in the lower part of the ship side 3B and opens on the outside in the ship width direction and facing diagonally downward. Here, in this embodiment, a case is illustrated in which the first water intake 56 is formed on one side in the ship width direction (ship side 3A side), and the second water intake 57 is formed on the other side in the ship width direction (ship side 3B side). The water intake piping system 51 includes an on-off valve 51v that turns on and off the intake of seawater from the first water intake port 56, and an on-off valve 51w that turns on and off the intake of seawater from the second water intake port 57. The water intake piping system 51 can take in seawater from outside the hull 2 ​​into the hull 2 ​​by opening at least one of the on-off valves 51v and 51w and operating at least one of pumps 52p, 53p, and 54p described below.

[0017] One end of the first seawater introduction piping system 52 is connected to the water intake piping system 51 between the on-off valve 51v and the on-off valve 51w. The other end of the first seawater introduction piping system 52 is connected to the scrubber 20. The first seawater introduction piping system 52 is provided with an inlet valve 52v and a pump 52p. The inlet valve 52v turns on and off the introduction of seawater from the water intake piping system 51 to the first seawater introduction piping system 52. The pump 52p takes in seawater from the water intake piping system 51 into the first seawater introduction piping system 52 and sends it to the scrubber 20.

[0018] The seawater sent from the first seawater introduction piping system 52 to the scrubber 20 is sprayed using an appropriate nozzle or the like in the scrubber 20, and comes into gas-liquid contact with the exhaust gas flowing through the scrubber 20. One end of a drainage piping system 55 for discharging the seawater sprayed in the scrubber 20 is connected to the scrubber 20. The other end of the drainage piping system 55 opens toward the outside of the ship. An outlet valve 55v is provided in the drainage piping system 55. The outlet valve 55v switches on and off the discharge of seawater from the drainage piping system 55 to the outside of the ship 2.

[0019] One end of the second seawater introduction piping system 53A is connected to the water intake piping system 51 between the on-off valve 51v and the on-off valve 51w. The other end of the second seawater introduction piping system 53A opens toward the outside of the ship. The second seawater introduction piping system 53A is provided with an inlet valve 53v, a pump 53p, a first heat exchanger 61, and an outlet valve 53w. The inlet valve 53v switches on and off the introduction of seawater from the water intake piping system 51 to the second seawater introduction piping system 53A. The pump 53p takes in seawater from the water intake piping system 51 to the second seawater introduction piping system 53A. The outlet valve 53w switches on and off the discharge of seawater from the second seawater introduction piping system 53A to the outside of the ship 2.

[0020] The first heat exchanger 61 is provided in the second seawater introduction piping system 53A. The first heat exchanger 61 exchanges heat between the seawater introduced into the second seawater introduction piping system 53A and a coolant for cooling the combustion device 8. An example of the coolant for cooling the combustion device 8 is fresh water. The temperature of the seawater is raised by the heat exchange in the first heat exchanger 61.

[0021] One end of the third seawater introduction piping system 54A is connected to the water intake piping system 51 between the on-off valve 51v and the on-off valve 51w. The other end of the third seawater introduction piping system 54A opens toward the outside of the ship. The third seawater introduction piping system 54A is provided with an inlet valve 54v, a pump 54p, a second heat exchanger 62, and an outlet valve 54w. The inlet valve 54v switches on and off the introduction of seawater from the water intake piping system 51 to the third seawater introduction piping system 54A. The pump 54p takes in seawater from the water intake piping system 51 to the third seawater introduction piping system 54A. The outlet valve 54w switches on and off the discharge of seawater from the third seawater introduction piping system 54A to the outside of the ship 2.

[0022] The second heat exchanger 62 is provided in the third seawater inlet piping system 54A. The second heat exchanger 62 exchanges heat between the seawater introduced into the third seawater inlet piping system 54A and a coolant for cooling a heat source other than the combustion device 8. Examples of the heat source other than the combustion device 8 include a steam turbine condenser and a liquefaction device condenser. The seawater is heated by the heat exchange in the second heat exchanger 62.

[0023] (Configuration of the heating section) The temperature raising section 70A is configured to be able to raise the temperature of seawater flowing through the first seawater inlet piping system 52. The temperature raising section 70A in this embodiment is able to introduce the seawater that has passed through the first heat exchanger 61 from the second seawater inlet piping system 53A to the first seawater inlet piping system 52. The temperature raising section 70A includes a connection pipe 71A and a temperature adjustment valve 72A.

[0024] One end of the connecting pipe 71A is connected to the second seawater introduction piping system 53A. Specifically, one end of the connecting pipe 71A is connected to the second seawater introduction piping system 53A downstream of the first heat exchanger 61. The other end of the connecting pipe 71A is connected to the first seawater introduction piping system 52 between the inlet valve 52v and the pump 52p. The connecting pipe 71A sends the seawater that has passed through the first heat exchanger 61 from the second seawater introduction piping system 53A to the first seawater introduction piping system 52. As a result, the seawater that has been heated through the first heat exchanger 61 is mixed with the seawater flowing through the first seawater introduction piping system 52.

[0025] The temperature control valve 72A can intermittently introduce the seawater, the temperature of which has been increased through the first heat exchanger 61, into the first seawater introduction piping system 52. For example, closing the temperature control valve 72A increases the flow rate of seawater introduced into the first seawater introduction piping system 52 through the connecting pipe 71A, and opening the temperature control valve 72A decreases the flow rate of seawater introduced into the first seawater introduction piping system 52 through the connecting pipe 71A. The temperature control valve 72A is provided, for example, downstream of the connection portion of the connecting pipe 71A to the second seawater introduction piping system 53A. The temperature control valve 72A may be, for example, a three-way valve provided at the connection portion between the second seawater introduction piping system 53A and the connecting pipe 71A. Here, at least when the temperature control valve 72A is opened, the above-mentioned outlet valve 53w is also opened.

[0026] The temperature adjustment valve 72A is equipped with a temperature sensor 72s. The temperature sensor 72s detects the temperature of seawater flowing through the first seawater introduction piping system 52, downstream of a connection part to which the other end of the connection pipe 71A is connected. In other words, the temperature sensor 72s detects the temperature of the seawater in the first seawater introduction piping system 52 after it has been mixed with the seawater whose temperature has been increased by passing through the first heat exchanger 61.

[0027] FIG. 3 is a diagram showing a state in which seawater that has passed through a first heat exchanger is sent to a first seawater inlet piping system in the seawater inlet system according to the first embodiment of the present disclosure. 3, the temperature control valve 72A is closed when the temperature of the seawater detected by the temperature sensor 72s is lower than a preset threshold value. As a result, the seawater that has passed through the first heat exchanger 61 is sent from the second seawater introduction piping system 53A through the connecting pipe 71A to the first seawater introduction piping system 52. Then, the temperature of the seawater introduced into the scrubber 20 through the first seawater introduction piping system 52 is increased. In addition, when the temperature of the seawater detected by the temperature sensor 72s is above a threshold value, the temperature control valve 72A does not introduce the seawater that has passed through the first heat exchanger 61 into the first seawater introduction piping system 52 via the connecting pipe 71A.

[0028] The threshold for switching between opening and closing the temperature control valve 72A may be set to, for example, 32° C. The maximum temperature of seawater in various sea areas where the ship 1 navigates is approximately 32° C. Therefore, when the threshold is set to 32° C., in reality, the temperature control valve 72A is always closed except in sea areas where the seawater temperature reaches a maximum temperature of 32° C. or higher, and the temperature of the seawater introduced into the scrubber 20 is increased by the seawater that has passed through the first heat exchanger 61. The temperature adjustment valve 72A may be replaced with a three-way valve, and the opening and closing operation may be performed automatically by a control device (not shown) based on the detection value of the temperature sensor 72s, or may be performed by an operator.

[0029] (Action and effect) In the ship 1 of the first embodiment, seawater is introduced from the outside of the hull 2 ​​to the scrubber 20 through the first seawater introduction piping system 52, and the heating section 70A is configured to be able to heat the seawater flowing through the first seawater introduction piping system 52. This increases the temperature of the seawater introduced into the scrubber 20, thereby increasing the temperature of the exhaust gas that is washed with seawater in the scrubber 20 and sent to the recovery device 30. This makes it possible to suppress a decrease in the temperature of the exhaust gas after washing when the exhaust gas is desulfurized using seawater. As a result, it is possible to suppress a decrease in the recovery efficiency when the recovery device 30 recovers carbon dioxide contained in the exhaust gas.

[0030] In the first embodiment, the seawater introduced into the second seawater introduction piping system 53A from outside the hull 2 ​​is heated by the first heat exchanger 61 through heat exchange with the cooling liquid for cooling the combustion device 8. The seawater heated through the first heat exchanger 61 can be introduced from the second seawater introduction piping system 53A to the first seawater introduction piping system 52, so that the temperature of the seawater introduced into the scrubber 20 can be increased. Therefore, there is no need to prepare a dedicated heating means for increasing the temperature of the seawater introduced into the scrubber 20, and the thermal energy generated in the hull 2 ​​can be effectively utilized by utilizing the exhaust heat of the combustion device 8. In addition, the energy required for the dedicated heating means can be reduced.

[0031] (Modification of the first embodiment) In the first embodiment, the seawater that has passed through the second heat exchanger 62 in the third seawater inlet piping system 54A is discharged overboard, but this is not limited to the above. The seawater that has passed through the second heat exchanger 62 in the third seawater inlet piping system 54A may also be introduced into the first seawater inlet piping system 52, similar to the second seawater inlet piping system 53A, to increase the temperature of the seawater introduced into the scrubber 20.

[0032] In the first embodiment, the temperature adjustment valve 72A is opened and closed to switch between sending heated seawater to the first seawater introduction piping system 52, but the present invention is not limited to this. FIG. 4 is a diagram showing a modified example of the seawater introduction system according to the first embodiment of the present disclosure. 4, in addition to the temperature adjustment valve 72A, the connecting pipe 71A may be provided with a temperature adjustment valve 72B. In this case, when the temperature adjustment valve 72A is opened, the temperature adjustment valve 72B is closed, and when the temperature adjustment valve 72A is closed, the temperature adjustment valve 72B is opened. When adjusting the opening degree of the temperature adjustment valves 72A and 72B, the opening degrees are adjusted so that the sum of the opening degrees of the temperature adjustment valves 72A and 72B is 100%.

[0033] Second Embodiment Next, a second embodiment of the ship according to the present disclosure will be described. In the second embodiment described below, the same parts as in the first embodiment are denoted by the same reference numerals, and therefore, duplicated explanations will be omitted.

[0034] FIG. 5 is a diagram showing a schematic configuration of a seawater introduction system according to the second embodiment of the present disclosure. As shown in Figure 5, the seawater introduction system 50B of the ship 1 in this embodiment at least includes a water intake piping system 51, a first seawater introduction piping system 52, a second seawater introduction piping system 53B, a third seawater introduction piping system 54B, a discharge piping system 55, a first heat exchanger 61, and a second heat exchanger 62.

[0035] One end of the second seawater introduction piping system 53B is connected to the water intake piping system 51 between the on-off valve 51v and the on-off valve 51w. The other end of the second seawater introduction piping system 53B opens toward the outside of the ship. The second seawater introduction piping system 53B is provided with an inlet valve 53v, a pump 53p, a first heat exchanger 61, and an outlet valve 53w.

[0036] The first heat exchanger 61 is provided in the second seawater introduction piping system 53B. The first heat exchanger 61 exchanges heat between the seawater introduced into the second seawater introduction piping system 53B and a coolant for cooling the combustion device 8. The heat exchange in the first heat exchanger 61 raises the temperature of the seawater.

[0037] One end of the third seawater introduction piping system 54B is connected to the water intake piping system 51 between the on-off valve 51v and the on-off valve 51w. The other end of the third seawater introduction piping system 54B opens toward the outside of the ship. The third seawater introduction piping system 54B is provided with an inlet valve 54v, a pump 54p, a second heat exchanger 62, and an outlet valve 54w.

[0038] The second heat exchanger 62 is provided in the third seawater inlet piping system 54B. The second heat exchanger 62 exchanges heat between the seawater introduced into the third seawater inlet piping system 54B and a coolant for cooling a heat source other than the combustion device 8. Although the first heat exchanger 61 is a larger heat exchanger than the second heat exchanger 62, the present invention is not limited to this configuration.

[0039] (Configuration of the heating section) The temperature raising section 70B of the ship 1 of the second embodiment is configured to raise the temperature of seawater flowing through the first seawater introduction piping system 52, similar to the temperature raising section 70A of the first embodiment. The temperature raising section 70B in the second embodiment is capable of introducing seawater that has passed through both the first heat exchanger 61 and the second heat exchanger 62 into the first seawater introduction piping system 52. The temperature raising section 70B is capable of introducing seawater that has passed through the first heat exchanger 61 into the first seawater introduction piping system 52 via the second seawater introduction piping system 53B and the third seawater introduction piping system 54B. The temperature raising section 70B is capable of introducing seawater that has passed through the second heat exchanger 62 into the first seawater introduction piping system 52 from the third seawater introduction piping system 54B. The temperature raising section 70B includes a first connecting pipe 73, a first temperature adjustment valve 74, a second connecting pipe 75, and a second temperature adjustment valve .

[0040] One end of the first connecting pipe 73 is connected to the second seawater introduction piping system 53B downstream of the first heat exchanger 61. The other end of the first connecting pipe 73 is connected to the third seawater introduction piping system 54B between the inlet valve 54v and the pump 54p. The second seawater introduction piping system 53B and the third seawater introduction piping system 54B are connected to each other so as to be able to communicate with each other through the first connecting pipe 73. The first connecting pipe 73 sends the seawater that has passed through the first heat exchanger 61 from the second seawater introduction piping system 53B to the third seawater introduction piping system 54B. As a result, the seawater that has been heated through the first heat exchanger 61 is mixed with the seawater flowing through the third seawater introduction piping system 54B.

[0041] The first temperature control valve 74 can intermittently introduce the seawater, the temperature of which has been increased through the first heat exchanger 61, into the third seawater introduction piping system 54B. For example, by closing the first temperature control valve 74, the flow rate of seawater introduced into the third seawater introduction piping system 54B through the first connecting pipe 73 increases, and by opening the first temperature control valve 74, the flow rate of seawater introduced into the third seawater introduction piping system 54B through the first connecting pipe 73 decreases. The first temperature control valve 74 is provided, for example, downstream of the connection portion of the first connecting pipe 73 to the second seawater introduction piping system 53B. The first temperature control valve 74 may be, for example, a three-way valve provided at the connection portion between the second seawater introduction piping system 53B and the first connecting pipe 73. Here, at least when the first temperature control valve 74 is opened, the above-mentioned outlet valve 53w is also opened.

[0042] The first temperature control valve 74 is equipped with a temperature sensor 74s. The temperature sensor 74s detects the temperature of seawater flowing through the third seawater introduction piping system 54B downstream of a connection part of the third seawater introduction piping system 54B to which the other end of the first connecting pipe 73 is connected. In other words, the temperature sensor 74s detects the temperature of the seawater in the third seawater introduction piping system 54B after it has been mixed with the seawater whose temperature has been increased through the first heat exchanger 61.

[0043] One end of the second connecting pipe 75 is connected to the third seawater introduction piping system 54B downstream of the second heat exchanger 62. The other end of the second connecting pipe 75 is connected to the first seawater introduction piping system 52 between the inlet valve 52v and the pump 52p. The second connecting pipe 75 sends the seawater that has passed through the second heat exchanger 62 from the third seawater introduction piping system 54B to the first seawater introduction piping system 52. As a result, the seawater circulating in the first seawater introduction piping system 52 is mixed with the seawater that has been heated through the second heat exchanger 62.

[0044] The second temperature control valve 76 can intermittently introduce the seawater, the temperature of which has been increased through the second heat exchanger 62, into the first seawater introduction piping system 52. For example, by closing the second temperature control valve 76, the flow rate of seawater introduced into the first seawater introduction piping system 52 through the second connecting pipe 75 increases, and by opening the second temperature control valve 76, the flow rate of seawater introduced into the first seawater introduction piping system 52 through the second connecting pipe 75 decreases. The second temperature control valve 76 is provided, for example, downstream of the connection portion of the second connecting pipe 75 to the third seawater introduction piping system 54B. The second temperature control valve 76 may be, for example, a three-way valve provided at the connection portion between the third seawater introduction piping system 54B and the second connecting pipe 75. Here, at least when the second temperature control valve 76 is opened, the above-mentioned outlet valve 54w is also opened.

[0045] The second temperature control valve 76 is equipped with a temperature sensor 76s, similar to the first temperature control valve 74. The temperature sensor 76s detects the temperature of seawater flowing through the first seawater introduction piping system 52, downstream of the connection part of the other end of the second connecting pipe 75. In other words, the temperature sensor 76s detects the temperature of the seawater in the first seawater introduction piping system 52 after it has been mixed with the seawater whose temperature has been increased through the second heat exchanger 62.

[0046] FIG. 6 is a diagram showing a state in which seawater that has passed through a first heat exchanger and a second heat exchanger is fed into a first seawater inlet piping system in a seawater inlet system according to a second embodiment of the present disclosure. As shown in Fig. 6, the first temperature control valve 74 and the second temperature control valve 76 are closed when the temperature of the seawater detected by the temperature sensors 74s, 76s is less than a preset threshold value (e.g., 32°C). As a result, the seawater heated through the first heat exchanger 61 is sent from the second seawater introduction piping system 53B to the third seawater introduction piping system 54B through the first connecting pipe 73. Seawater mixed with the seawater that has passed through the first heat exchanger 61 is sent to the second heat exchanger 62 through the third seawater introduction piping system 54B, where it is further heated. Then, the seawater heated in two stages by the first heat exchanger 61 and the second heat exchanger 62 is mixed into the first seawater introduction piping system 52. Furthermore, the first temperature control valve 74 and the second temperature control valve 76 are opened when the temperature of the seawater detected by the temperature sensors 74s and 76s is equal to or higher than a threshold value, thereby preventing the seawater that has passed through the first heat exchanger 61 and the second heat exchanger 62 from being introduced into the first seawater introduction piping system 52.

[0047] (Action and effect) In the ship 1 of the second embodiment, as in the first embodiment, the temperature of the seawater introduced into the scrubber 20 can be increased to increase the temperature of the exhaust gas that is scrubbed by the seawater in the scrubber 20 and sent to the capture device 30. Therefore, when the exhaust gas is desulfurized using seawater, a decrease in the temperature of the exhaust gas after desulfurization can be suppressed. As a result, a decrease in the capture efficiency when the capture device 30 captures carbon dioxide contained in the exhaust gas can be suppressed.

[0048] In the second embodiment, the seawater introduced into the third seawater introduction piping system 54B from outside the hull 2 ​​is heated by the second heat exchanger 62 through heat exchange with a coolant for cooling a heat source other than the combustion device 8. The seawater heated through the second heat exchanger 62 can be introduced from the third seawater introduction piping system 54B to the first seawater introduction piping system 52, so that the temperature of the seawater introduced into the scrubber 20 can be increased. Therefore, the exhaust heat of a heat source other than the combustion device 8 can be used to increase the temperature of the seawater introduced into the scrubber 20, so that the thermal energy generated inside the hull 2 ​​can be used more effectively.

[0049] Furthermore, in the second embodiment, the second seawater introduction piping system 53B and the third seawater introduction piping system 54B are connected so as to be able to communicate with each other. This allows the seawater whose temperature has been raised in two stages through both the first heat exchanger 61 and the second heat exchanger 62 to be introduced into the first seawater introduction piping system 52. Therefore, the temperature of the seawater introduced into the scrubber 20 can be increased more efficiently by utilizing the exhaust heat generated in the ship 1.

[0050] (Modification of the second embodiment) In the second embodiment described above, as in the modified example of the first embodiment described above, in addition to the first temperature control valve 74 and the second temperature control valve 76, temperature control valves may be provided in the first connecting pipe 73, the connecting pipe 71C, and the second connecting pipe 75.

[0051] <Third embodiment> Next, a third embodiment of the ship according to the present disclosure will be described. In the third embodiment described below, only the configuration of the heating section is different from that of the first and second embodiments, so that the same parts as those of the first and second embodiments are denoted by the same reference numerals and will not be described again. FIG. 7 is a diagram showing a schematic configuration of a seawater introduction system according to the third embodiment of the present disclosure. As shown in Figure 7, the seawater introduction system 50C of the ship 1 of this third embodiment at least includes a water intake piping system 51, a first seawater introduction piping system 52, a second seawater introduction piping system 53C, a branch piping system 58, a discharge piping system 55, a first heat exchanger 61, and a third heat exchanger 63.

[0052] One end of the second seawater introduction piping system 53C is connected to the water intake piping system 51 between the on-off valve 51v and the on-off valve 51w. The other end of the second seawater introduction piping system 53C opens toward the outside of the ship. The second seawater introduction piping system 53C is provided with an inlet valve 53v, a pump 53p, a first heat exchanger 61, and an outlet valve 53w.

[0053] One end of the branch piping system 58 is connected to the first seawater introduction piping system 52 downstream of the pump 52p. A part of the seawater branching off from the first seawater introduction piping system 52 and flowing through the first seawater introduction piping system 52 can be introduced into the branch piping system 58. The other end of the branch piping system 58 is connected to a connecting pipe 71C described later.

[0054] The third heat exchanger 63 is provided in the middle of the branch piping system 58. The third heat exchanger 63 exchanges heat between the seawater introduced into the branch piping system 58 and a coolant for cooling a heat source other than the combustion device 8. The temperature of the seawater is increased by the heat exchange in the third heat exchanger 63. Note that, although the case where the first heat exchanger 61 is a larger heat exchanger than the third heat exchanger 63 is illustrated, the present invention is not limited to this configuration.

[0055] (Configuration of the heating section) Similar to the heating section 70A of the first embodiment described above, the heating section 70C of the ship 1 of the third embodiment is configured to be capable of heating seawater flowing through the first seawater inlet piping system 52. The heating section 70C in the third embodiment is capable of introducing seawater that has passed through the first heat exchanger 61 from the second seawater inlet piping system 53C to the first seawater inlet piping system 52. The heating section 70C is also capable of introducing seawater that has passed through the third heat exchanger 63 from the branch piping system 58 to the first seawater inlet piping system 52. The heating section 70C includes a connecting pipe 71C and a temperature adjustment valve 72C.

[0056] One end of the connection pipe 71C is connected to the second seawater introduction piping system 53C downstream of the first heat exchanger 61. The other end of the connection pipe 71C is connected to the first seawater introduction piping system 52 between the inlet valve 52v and the pump 52p. The other end of the branch piping system 58 is connected to the middle of this connection pipe 71C. That is, the connection pipe 71C can send the seawater that has passed through the first heat exchanger 61 and the seawater that has passed through the third heat exchanger 63 to the first seawater introduction piping system 52. This allows the seawater that has been heated through the first heat exchanger 61 and the third heat exchanger 63 to be mixed with the seawater flowing through the first seawater introduction piping system 52. The branch piping system 58 may be directly connected to the first seawater introduction piping system 52 without being connected to the connection pipe 71C.

[0057] The temperature control valve 72C can intermittently introduce the seawater, the temperature of which has been increased through the first heat exchanger 61, into the first seawater introduction piping system 52. For example, by closing the temperature control valve 72C, the flow rate of seawater introduced from the second seawater introduction piping system 53C through the connecting pipe 71C into the first seawater introduction piping system 52 increases, and by opening the temperature control valve 72C, the flow rate of seawater introduced from the second seawater introduction piping system 53C through the connecting pipe 71C into the first seawater introduction piping system 52 decreases. The temperature control valve 72C is provided, for example, downstream of the connection part of the connecting pipe 71C to the second seawater introduction piping system 53C. The temperature control valve 72C may be, for example, a three-way valve provided at the connection part between the second seawater introduction piping system 53C and the connecting pipe 71C. Here, similarly to the first embodiment, at least when the temperature control valve 72C is opened, the above-mentioned outlet valve 53w is also opened.

[0058] The temperature control valve 72C is equipped with a temperature sensor 72s. The temperature sensor 72s detects the temperature of seawater flowing through the first seawater introduction piping system 52, downstream of a connection part to which the other end of the connection pipe 71C is connected. In other words, the temperature sensor 72s detects the temperature of the seawater in the first seawater introduction piping system 52 after it is mixed with the seawater whose temperature has been increased through the first heat exchanger 61 and the third heat exchanger 63.

[0059] The temperature control valve 72C is opened when the temperature of the seawater detected by the temperature sensor 72s is equal to or higher than a preset threshold value. In this case, the seawater that has passed through the first heat exchanger 61 is no longer introduced into the first seawater introduction piping system 52. However, a portion of the seawater in the first seawater introduction piping system 52 is introduced into the branch piping system 58 and returned to the first seawater introduction piping system 52 via the connecting pipe 71C. At this time, the seawater introduced into the branch piping system 58 is heat exchanged by the third heat exchanger 63 and the temperature increases.

[0060] FIG. 8 is a diagram showing a state in which seawater that has passed through the first heat exchanger and the third heat exchanger is fed into a first seawater inlet piping system in a seawater inlet system according to a third embodiment of the present disclosure. 8, when the temperature of the seawater detected by the temperature sensor 72s is lower than a preset threshold value, the temperature control valve 72C is closed. As a result, the seawater that has passed through the first heat exchanger 61 merges with the seawater that has passed through the third heat exchanger 63, and is sent to the first seawater introduction piping system 52 through the connecting pipe 71C. Then, the temperature of the seawater introduced into the scrubber 20 through the first seawater introduction piping system 52 is increased. In addition, when the temperature of the seawater detected by the temperature sensor 72s is above a threshold value, the temperature control valve 72C does not introduce the seawater that has passed through the first heat exchanger 61 and the third heat exchanger 63 into the first seawater inlet piping system 52 via the connecting pipe 71C.

[0061] (Action and effect) In the ship 1 of the third embodiment, as in the first and second embodiments, the temperature of seawater introduced into the scrubber 20 is increased, and the temperature of the exhaust gas scrubbed by seawater in the scrubber 20 and sent to the capture device 30 can be increased. Therefore, when the exhaust gas is desulfurized using seawater, a decrease in the temperature of the exhaust gas after desulfurization can be suppressed. As a result, a decrease in the capture efficiency when the capture device 30 captures carbon dioxide contained in the exhaust gas can be suppressed.

[0062] In the third embodiment, the seawater introduced from the first seawater introduction piping system 52 to the branch piping system 58 is heated by the third heat exchanger 63 through heat exchange with a coolant for cooling a heat source other than the combustion device 8. The seawater heated through the third heat exchanger 63 is constantly introduced from the branch piping system 58 to the first seawater introduction piping system 52. Therefore, by effectively utilizing the thermal energy generated inside the hull 2, the temperature of the seawater introduced into the scrubber 20 can be constantly increased.

[0063] In the third embodiment, the seawater introduced into the second seawater introduction piping system 53C from outside the hull 2 ​​is heated by the first heat exchanger 61 through heat exchange with a coolant for cooling the combustion device 8. When the temperature of the seawater detected by the temperature sensor 72s is lower than a preset threshold value, the seawater heated through the first heat exchanger 61 is introduced from the second seawater introduction piping system 53C to the first seawater introduction piping system 52. Therefore, when the temperature of the seawater detected by the temperature sensor 72s is lower than a preset threshold value, the temperature of the seawater introduced into the scrubber 20 can be made higher than when only the seawater heated through the third heat exchanger 63 is introduced into the first seawater introduction piping system 52.

[0064] (Modification of the third embodiment) In the third embodiment, similarly to the modified example of the first embodiment, in addition to the temperature adjustment valve 72C, a temperature adjustment valve may be provided in the connecting pipe 71C.

[0065] (Other embodiments) Although the embodiments of the present disclosure have been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes and the like that do not depart from the gist of the present disclosure are also included. In each of the above-described embodiments, for example, the first heat exchanger 61, the second heat exchanger 62, and the third heat exchanger 63 may be arranged in an interchangeable manner.

[0066] In addition, in each of the above embodiments, the temperature control valves 72A to 72C are opened and closed, but the opening degree of the temperature control valves 72A to 72C may be adjusted depending on the temperature of the seawater sent to the scrubber 20 through the first seawater inlet piping system 52.

[0067] Furthermore, in each of the above embodiments, the temperature control valves 72A to 72C are provided and are switched between open and closed states depending on the temperature of the seawater sent to the scrubber 20, but this is not limited to the above. For example, the seawater heated in the first heat exchanger 61, the second heat exchanger 62, and the third heat exchanger 63 may always be sent to the scrubber 20.

[0068] In addition, the configurations of the above-described embodiments may be combined as appropriate. For example, the configurations of the branch piping system 58 and the third heat exchanger 63 of the third embodiment may be applied to the seawater introduction system 50B of the second embodiment.

[0069] In addition, in each of the above embodiments, the scrubber 20 is configured to desulfurize the exhaust gas. However, the scrubber 20 may be configured to clean unnecessary components and impurities in the exhaust gas, without being limited to desulfurization.

[0070] <Additional Notes> The ship 1 described in each embodiment can be understood, for example, as follows.

[0071] (1) A ship 1 in a first embodiment comprises a hull 2, a combustion device 8 mounted on the hull 2 ​​and combusting fuel, a scrubber 20 mounted on the hull 2 ​​and cleaning exhaust gas from the combustion device 8 with seawater, a capture device 30 mounted on the hull 2 ​​and capturing carbon dioxide from the exhaust gas that has passed through the scrubber 20, a first seawater inlet piping system 52 capable of introducing seawater into the scrubber 20 from outside the hull 2, and heating sections 70A-70C capable of heating the seawater flowing through the first seawater inlet piping system 52.

[0072] This increases the temperature of the seawater introduced into the scrubber 20, and increases the temperature of the exhaust gas that is washed with seawater in the scrubber 20 and sent to the capture device 30. In this way, when the exhaust gas is washed with seawater, a decrease in the temperature of the exhaust gas after washing can be suppressed. As a result, a decrease in the capture efficiency when capturing carbon dioxide contained in the exhaust gas in the capture device 30 can be suppressed.

[0073] (2) The ship 1 according to the second aspect is the ship 1 of (1), and is equipped with a second seawater inlet piping system 53A-53C capable of introducing seawater from outside the hull 2, and a first heat exchanger 61 that performs heat exchange between the seawater introduced into the second seawater inlet piping system 53A-53C and a cooling liquid for cooling the combustion device 8, and the heating sections 70A-70C are capable of introducing the seawater that has passed through the first heat exchanger 61 from the second seawater inlet piping system 53A-53C to the first seawater inlet piping system 52.

[0074] As a result, the seawater heated through the first heat exchanger 61 can be introduced from the second seawater introduction piping system 53A-53C to the first seawater introduction piping system 52, thereby increasing the temperature of the seawater introduced into the scrubber 20. Therefore, there is no need to prepare a dedicated heating means to increase the temperature of the seawater introduced into the scrubber 20, and by utilizing the exhaust heat of the combustion device 8, the thermal energy generated inside the hull 2 ​​can be effectively utilized. In addition, the energy required for the dedicated heating means can be reduced.

[0075] (3) The ship 1 according to a third aspect is the ship 1 of (2), and is equipped with a third seawater inlet piping system 54B capable of introducing seawater from outside the hull 2, and a second heat exchanger 62 that performs heat exchange between the seawater introduced into the third seawater inlet piping system 54B and a cooling liquid for cooling a heat source other than the combustion device 8 provided in the hull 2, and the heating section 70B is capable of introducing the seawater that has passed through the second heat exchanger 62 from the third seawater inlet piping system 54B to the first seawater inlet piping system 52.

[0076] As a result, the seawater heated through the second heat exchanger 62 can be introduced from the third seawater introduction piping system 54B to the first seawater introduction piping system 52, thereby increasing the temperature of the seawater introduced into the scrubber 20. Therefore, by utilizing the exhaust heat of a heat source other than the combustion device 8 to increase the temperature of the seawater introduced into the scrubber 20, the thermal energy generated inside the hull 2 ​​can be used more effectively.

[0077] (4) The ship 1 in a fourth aspect is the ship 1 of (3), wherein the second seawater inlet piping system 53B and the third seawater inlet piping system 54B are connected so as to be able to communicate with each other, and the heating section 70B is capable of introducing seawater that has passed through both the first heat exchanger 61 and the second heat exchanger 62 into the first seawater inlet piping system 52.

[0078] As a result, the seawater whose temperature has been raised in two stages by passing through both the first heat exchanger 61 and the second heat exchanger 62 can be introduced into the first seawater introduction piping system 52. Therefore, the temperature of the seawater introduced into the scrubber 20 can be increased more efficiently.

[0079] (5) The ship 1 according to a fifth aspect is any one of the ships 1 of (1) to (4), and is equipped with a branch piping system 58 branching off from the first seawater inlet piping system 52 and capable of introducing a portion of seawater from the first seawater inlet piping system 52, and a third heat exchanger 63 performing heat exchange between the seawater introduced into the branch piping system 58 and a cooling liquid for cooling a heat source other than the combustion device 8 provided in the hull 2, and the heating section 70C is capable of introducing the seawater that has passed through the third heat exchanger 63 from the branch piping system 58 to the first seawater inlet piping system 52.

[0080] As a result, the seawater heated through the third heat exchanger 63 can be introduced into the first seawater inlet piping system 52 through the branch piping system 58, thereby increasing the temperature of the seawater introduced into the scrubber 20. Therefore, since exhaust heat from a heat source other than the combustion device 8 can be used to increase the temperature of the seawater introduced into the scrubber 20, the thermal energy generated inside the hull 2 ​​can be used more effectively. [Explanation of symbols]

[0081] 1...ship 2...hull 2b...stern 3A, 3B...shipside 4...bottom 5...upper deck 6...superstructure 8...combustion system 20...scrubber 30...recovery system 50A~50C...seawater intake system 51...intake piping system 51v, 51w...on-off valve 52...first seawater intake piping system 52p...pump 52v...inlet valve 53A~53C...second seawater intake piping system 53p...pump 53v...inlet valve 53w...outlet valve 54A, 54B...third seawater intake piping system 54p...pump 54v...inlet valve 54w...outlet valve 55...discharge piping system 55v...outlet valve 56...first intake 57...second intake 58...branching piping system 61...first heat exchanger 62...second heat exchanger 63...third heat exchanger 70A to 70C...Heating section 71A, 71C...Connecting pipes 72A, 72B, 72C...Temperature control valve 72s...Temperature sensor 73...First connecting pipe 74...First temperature control valve 74s...Temperature sensor 75...Second connecting pipe 76...Second temperature control valve 76s...Temperature sensor 101...Exhaust gas piping system 102...Exhaust gas pipe

Claims

1. The hull and A combustion device provided on the hull and configured to combust fuel; a scrubber provided on the ship body for cleaning exhaust gas from the combustion device with seawater; A capture device provided on the ship hull and configured to capture carbon dioxide from the exhaust gas that has passed through the scrubber; a first seawater introduction piping system capable of introducing seawater into the scrubber from outside the hull; a temperature raising unit capable of raising the temperature of seawater flowing through the first seawater inlet piping system; A vessel equipped with:

2. A second seawater inlet piping system capable of introducing seawater from the outside of the ship body; a first heat exchanger for exchanging heat between the seawater introduced into the second seawater introduction piping system and a cooling liquid for cooling the combustion device, The temperature raising section is capable of introducing the seawater that has passed through the first heat exchanger from the second seawater introduction piping system to the first seawater introduction piping system.

2. The watercraft of claim 1.

3. a third seawater inlet piping system capable of introducing seawater from the outside of the ship body; a second heat exchanger that exchanges heat between the seawater introduced into the third seawater introduction piping system and a cooling liquid for cooling a heat source other than the combustion device provided in the hull, The temperature raising section is capable of introducing the seawater that has passed through the second heat exchanger from the third seawater introduction piping system to the first seawater introduction piping system.

3. The watercraft of claim 2.

4. the second seawater inlet piping system and the third seawater inlet piping system are connected so as to be able to communicate with each other; The temperature raising section is capable of introducing the seawater that has passed through both the first heat exchanger and the second heat exchanger into the first seawater introduction piping system.

4. The watercraft of claim 3.

5. a branch piping system that branches off from the first seawater inlet piping system and is capable of introducing a portion of the seawater from the first seawater inlet piping system; a third heat exchanger that exchanges heat between the seawater introduced into the branch piping system and a cooling liquid for cooling a heat source other than the combustion device provided in the hull, The temperature raising section is capable of introducing the seawater that has passed through the third heat exchanger from the branch piping system to the first seawater introduction piping system.

3. A vessel as claimed in claim 1 or 2.

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