Ship

Abstract

A ship is provided with: a hull; a combustion device which is provided on the hull and combusts fuel; a scrubber which is provided in the hull and scrubs the exhaust gas from the combustion device with seawater; a recovery device which is provided in the hull and which recovers 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 the outside of the hull; and a temperature raising unit capable of raising the temperature of the seawater flowing through the first seawater introduction piping system.

Description

Technical Field

[0001] This invention relates to a ship.

[0002] This application claims priority to Japanese Patent Application No. 2023-175047, filed on October 10, 2023, the contents of which are incorporated herein by reference. Background Technology

[0003] Patent Document 1 discloses a desulfurization device for ships, which is used to desulfurize exhaust gas discharged from exhaust gas generating devices installed on ships. In this desulfurization device, seawater or clean water is sprayed onto the exhaust gas as a washing liquid, so that the exhaust gas comes into contact with the washing liquid, thereby removing the sulfur components contained in the exhaust gas.

[0004] Previous technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2019-104482 Summary of the Invention

[0007] The technical problem to be solved by the invention

[0008] However, in the marine desulfurization device described in Patent Document 1, when seawater is used as the washing liquid, the temperature of the seawater drawn in from outside the ship as the washing liquid can sometimes be as low as, for example, around 5°C, depending on the season or the sea area where the ship is sailing. When the exhaust gas is desulfurized using low-temperature seawater, the temperature of the desulfurized exhaust gas also becomes lower.

[0009] If a ship is equipped with a carbon dioxide recovery device to recover carbon dioxide contained in exhaust gas, there is a problem that the recovery efficiency may be reduced if the desulfurized exhaust gas is at a low temperature.

[0010] The present invention was made to solve the above-mentioned problems, and its purpose is to provide a ship that can suppress the temperature drop of the exhaust gas after washing when using seawater to wash the exhaust gas.

[0011] means for solving technical problems

[0012] To address the aforementioned issues, the vessel of the present invention comprises a hull, a combustion device, a scrubber, a recovery device, a first seawater inlet piping system, and a heating unit. The combustion device is disposed on the hull and burns fuel. The scrubber is disposed on the hull and uses seawater to scrub the exhaust gas from the combustion device. The recovery device is disposed on the hull and recovers carbon dioxide from the exhaust gas passing through the scrubber. The first seawater inlet piping system is capable of introducing seawater from outside the hull into the scrubber. The heating unit is capable of heating the seawater flowing through the first seawater inlet piping system.

[0013] Invention Effects

[0014] According to the present invention, when using seawater to wash the exhaust gas, the temperature of the exhaust gas after washing can be suppressed. Attached Figure Description

[0015] Figure 1 This is a side view showing the schematic structure of a ship according to an embodiment of the present invention.

[0016] Figure 2 This is a diagram showing the schematic structure of the seawater introduction system according to the first embodiment of the present invention.

[0017] Figure 3 This diagram illustrates the state in which seawater passing through a first heat exchanger is introduced into a first seawater introduction piping system in the seawater introduction system according to the first embodiment of the present invention.

[0018] Figure 4 This is a diagram illustrating a modified example of the seawater introduction system according to the first embodiment of the present invention.

[0019] Figure 5 This is a diagram showing the schematic structure of the seawater introduction system according to the second embodiment of the present invention.

[0020] Figure 6 This diagram illustrates the state in which seawater passing through the first heat exchanger and the second heat exchanger is introduced into the first seawater introduction piping system in the seawater introduction system according to the second embodiment of the present invention.

[0021] Figure 7 This is a diagram showing the schematic structure of the seawater introduction system according to the third embodiment of the present invention.

[0022] Figure 8 This diagram illustrates the state in which seawater passing through the first heat exchanger and the third heat exchanger is introduced into the first seawater introduction piping system in the seawater introduction system according to the third embodiment of the present invention. Detailed Implementation

[0023] The following is for reference. Figures 1 to 8 The ship involved in the embodiments of the present invention will be described.

[0024] <First Implementation>

[0025] (The overall structure of the ship)

[0026] like Figure 1 As shown, the vessel 1 of this embodiment includes a hull 2, a combustion device 8, a scrubber 20, a recovery device 30, and a seawater introduction system 50A (see reference). Figure 2 ) and heating section 70A (reference) Figure 2 Furthermore, the type of vessel 1 in this embodiment is not limited to a specific type. Examples of vessel 1 include liquefied gas carriers, ferries, RORO ships, car carriers, and passenger ships.

[0027] (Structure of the ship's hull)

[0028] The hull 2 ​​has a pair of side panels 3A and 3B forming its outer shell, a bottom 4, and an upper deck 5. Side panels 3A and 3B have a pair of side platings forming the port and starboard sides, respectively. The bottom 4 has bottom platings connecting these side panels 3A and 3B. The upper deck 5 is a full-length deck exposed to the outside, on which a superstructure 6 with a living area is formed.

[0029] The combustion device 8 is a device that generates heat energy by burning fuel, and it is installed inside the hull 2 ​​described above. Examples of combustion devices 8 include internal combustion engines used in main engines that propel the ship 1, internal combustion engines used in power generation equipment that supplies electricity to the ship, and boilers that generate steam as a working fluid.

[0030] (Structure of a washer)

[0031] The scrubber 20 uses seawater to wash the exhaust gas discharged from the combustion unit 8. In this embodiment, the scrubber 20 is illustrated for example as being installed on the upper deck 5 of the hull 2, but the configuration of the scrubber 20 is not limited to the upper deck 5. The exhaust gas from the combustion unit 8 is introduced into the scrubber 20 via the exhaust gas piping system 101. The scrubber 20 desulfurizes the exhaust gas by bringing seawater supplied from the seawater introduction system 50A (described later) into gas-liquid contact with the exhaust gas from the combustion unit 8. Furthermore, the detailed structure of the scrubber 20 is not limited.

[0032] (Structure of the recycling device)

[0033] The recovery device 30 is installed on the hull 2 ​​to recover carbon dioxide from the exhaust gas passed through the scrubber 20. In this embodiment, the recovery device 30 is shown to be installed on the upper deck 5 of the hull 2, but the configuration of the recovery device 30 is not limited to the upper deck 5.

[0034] The recovery device 30 recovers carbon dioxide contained in the exhaust gas fed into the scrubber 20 via the exhaust pipe 102. As a method for recovering carbon dioxide, a chemical absorption method in which an absorbent liquid absorbs carbon dioxide can be cited as an example. Furthermore, MEA (monoethanolamine) can be cited as an absorbent liquid for absorbing carbon dioxide by the chemical absorption method. The recovery device 30 may, as needed, be equipped with an exhaust gas cooling device (cooler) for cooling the exhaust gas fed into the scrubber 20. Here, the exhaust gas after the carbon dioxide has been absorbed by the absorbent liquid is discharged into the atmosphere, for example, via an exhaust chimney (not shown) installed on the ship 1.

[0035] (Structure of the seawater introduction system)

[0036] Figure 2 This is a diagram showing the schematic structure of the seawater introduction system according to the first embodiment of the present invention.

[0037] like Figure 2 As shown, the seawater introduction system 50A includes at least 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 drainage piping system 55, a first heat exchanger 61, and a second heat exchanger 62.

[0038] The water intake piping system 51 draws seawater into the hull 2 ​​from the outside. One end of the water intake piping system 51 is connected to a first water intake 56. The first water intake 56 is formed by opening downwards on the bottom 4 of the hull. 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. In this embodiment, the second water intake 57 is formed at the lower part of the side 3B and opens obliquely downwards on the outer side in the width direction of the hull. Here, in this embodiment, the case is illustrated as follows: the first water intake 56 is formed on one side in the width direction of the hull (side 3A), and the second water intake 57 is formed on the other side in the width direction of the hull (side 3B). The water intake piping system 51 includes an on / off valve 51v for intermittently drawing seawater from the first water intake 56 and an on / off valve 51w for intermittently drawing seawater from the second water intake 57. The water intake piping system 51 is able to draw 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 the pumps 52p, 53p, and 54p described later.

[0039] One end of the first seawater inlet piping system 52 is connected to the water intake piping system 51 between on / off valves 51v and 51w. The other end of the first seawater inlet piping system 52 is connected to the scrubber 20. An inlet valve 52v and a pump 52p are installed in the first seawater inlet piping system 52. The inlet valve 52v intermittently introduces seawater from the water intake piping system 51 into the first seawater inlet piping system 52. The pump 52p draws seawater from the water intake piping system 51 into the first seawater inlet piping system 52 and delivers it to the scrubber 20.

[0040] Seawater introduced into the scrubber 20 from the first seawater inlet piping system 52 is sprayed inside the scrubber 20 using appropriate nozzles, etc., and comes into contact with the exhaust gas flowing inside the scrubber 20. A drainage piping system 55 for discharging the sprayed seawater is connected to one end of the scrubber 20. The other end of the drainage piping system 55 opens outwards from the ship. An outlet valve 55v is installed on the drainage piping system 55. The outlet valve 55v intermittently discharges seawater from the drainage piping system 55 to the outside of the ship hull 2.

[0041] One end of the second seawater inlet piping system 53A is connected to the intake piping system 51 between on / off valves 51v and 51w. The other end of the second seawater inlet piping system 53A opens outwards from the ship. The second seawater inlet piping system 53A includes an inlet valve 53v, a pump 53p, a first heat exchanger 61, and an outlet valve 53w. The inlet valve 53v intermittently introduces seawater from the intake piping system 51 into the second seawater inlet piping system 53A. The pump 53p draws seawater from the intake piping system 51 into the second seawater inlet piping system 53A. The outlet valve 53w intermittently discharges seawater from the second seawater inlet piping system 53A to the outside of the ship hull 2.

[0042] The first heat exchanger 61 is located midway through the second seawater inlet piping system 53A. The first heat exchanger 61 facilitates heat exchange between the seawater introduced into the second seawater inlet piping system 53A and the coolant used to cool the combustion device 8. Clean water can be an example of the coolant used to cool the combustion device 8. The seawater is heated through the heat exchange in the first heat exchanger 61.

[0043] One end of the third seawater inlet piping system 54A is connected to the intake piping system 51 between on / off valves 51v and 51w. The other end of the third seawater inlet piping system 54A opens outwards from the ship. The third seawater inlet piping system 54A includes an inlet valve 54v, a pump 54p, a second heat exchanger 62, and an outlet valve 54w. The inlet valve 54v intermittently introduces seawater from the intake piping system 51 into the third seawater inlet piping system 54A. The pump 54p draws seawater from the intake piping system 51 into the third seawater inlet piping system 54A. The outlet valve 54w intermittently discharges seawater from the third seawater inlet piping system 54A to the outside of the ship hull 2.

[0044] The second heat exchanger 62 is located midway through 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 the coolant used to cool heat sources other than the combustion device 8. Examples of heat sources other than the combustion device 8 include steam turbine condensers and liquefaction plant condensers. The seawater is heated by the heat exchange in the second heat exchanger 62.

[0045] (Structure of the heating section)

[0046] The heating unit 70A is configured to heat the seawater flowing through the first seawater inlet piping system 52. In this embodiment, the heating unit 70A can introduce seawater passing through the first heat exchanger 61 from the second seawater inlet piping system 53A to the first seawater inlet piping system 52. The heating unit 70A includes a connecting pipe 71A and a temperature regulating valve 72A.

[0047] One end of the connecting pipe 71A is connected to the second seawater inlet piping system 53A. Specifically, one end of the connecting pipe 71A is connected to the second seawater inlet piping system 53A, which is located downstream of the first heat exchanger 61. The other end of the connecting pipe 71A is connected to the first seawater inlet piping system 52, which is located between the inlet valve 52v and the pump 52p. The connecting pipe 71A delivers seawater that has passed through the first heat exchanger 61 from the second seawater inlet piping system 53A into the first seawater inlet piping system 52. Thus, the seawater flowing in the first seawater inlet piping system 52 mixes with the seawater that has been heated by the first heat exchanger 61.

[0048] The temperature regulating valve 72A can intermittently introduce seawater heated by the first heat exchanger 61 into the first seawater inlet piping system 52. For example, by closing the temperature regulating valve 72A, the flow rate of seawater introduced into the first seawater inlet piping system 52 via the connecting pipe 71A increases; by opening the temperature regulating valve 72A, the flow rate of seawater introduced into the first seawater inlet piping system 52 via the connecting pipe 71A decreases. The temperature regulating valve 72A is, for example, located downstream of the connection between the connecting pipe 71A and the second seawater inlet piping system 53A. The temperature regulating valve 72A can be, for example, a three-way valve installed at the connection between the second seawater inlet piping system 53A and the connecting pipe 71A. Here, at least when the temperature regulating valve 72A is open, the aforementioned outlet valve 53w is also open.

[0049] The temperature regulating valve 72A includes a temperature sensor 72s. The temperature sensor 72s is located downstream of the connection point to which the other end of the connecting pipe 71A is connected in the first seawater inlet piping system 52, and detects the temperature of the seawater flowing through the first seawater inlet piping system 52. That is, the temperature sensor 72s detects the temperature of the seawater within the first seawater inlet piping system 52 after the seawater heated by the first heat exchanger 61 has been mixed.

[0050] Figure 3 This diagram illustrates the state in which seawater passing through a first heat exchanger is introduced into a first seawater introduction piping system in the seawater introduction system according to the first embodiment of the present invention.

[0051] like Figure 3 As shown, when the temperature of the seawater detected by the temperature sensor 72s is lower than a preset threshold, the temperature regulating valve 72A closes. Consequently, the seawater passing through the first heat exchanger 61 is fed from the second seawater inlet piping system 53A into the first seawater inlet piping system 52 via the connecting pipe 71A. Then, the temperature of the seawater introduced into the scrubber 20 through the first seawater inlet piping system 52 increases.

[0052] Furthermore, if the temperature of the seawater detected by the temperature sensor 72s is above the threshold, the temperature regulating valve 72A will not introduce the seawater that has passed through the first heat exchanger 61 through the connecting pipe 71A into the first seawater inlet piping system 52.

[0053] The threshold for switching the opening and closing of the temperature regulating valve 72A can be set, for example, to 32°C. The highest temperature of seawater in the various sea areas where the ship 1 navigates is around 32°C. Therefore, when the threshold is set to 32°C, in practice, outside of sea areas where the seawater temperature is above 32°C, the temperature regulating valve 72A is always closed, and the temperature of the seawater introduced into the scrubber 20 is increased by the seawater passing through the first heat exchanger 61.

[0054] Alternatively, the temperature regulating valve 72A can be replaced with a three-way valve. The opening and closing operation can be automatically controlled by the temperature sensor 72s and the control device (not shown), or it can be operated by personnel.

[0055] (Effects)

[0056] In the ship 1 of the first embodiment described above, seawater is introduced from outside the hull 2 ​​into the scrubber 20 through the first seawater inlet piping system 52. The heating unit 70A is configured to heat the seawater flowing through the first seawater inlet 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 by seawater within the scrubber 20 and transported to the recovery unit 30. Therefore, when using seawater to desulfurize the exhaust gas, the temperature drop of the exhaust gas after washing can be suppressed. As a result, the reduction in recovery efficiency when recovering carbon dioxide contained in the exhaust gas by the recovery unit 30 can be suppressed.

[0057] Furthermore, in the first embodiment described above, the seawater introduced from outside the hull 2 ​​into the second seawater inlet piping system 53A is heated by heat exchange with the coolant used to cool the combustion device 8 through the first heat exchanger 61. The seawater heated by the first heat exchanger 61 can be introduced from the second seawater inlet piping system 53A into the first seawater inlet piping system 52, thus increasing the temperature of the seawater introduced into the scrubber 20. Therefore, to increase the temperature of the seawater introduced into the scrubber 20, there is no need to prepare a dedicated heating mechanism; by utilizing the waste heat of the combustion device 8, the heat energy generated within the hull 2 ​​can be effectively utilized. Furthermore, the energy required for a dedicated heating mechanism can be reduced.

[0058] (A variation of the first embodiment)

[0059] Furthermore, in the first embodiment described above, seawater passing through the second heat exchanger 62 is discharged outside the ship in the third seawater inlet piping system 54A, but this is not a limitation. The seawater passing through the second heat exchanger 62 in the third seawater inlet piping system 54A can also be introduced into the first seawater inlet piping system 52 in the same manner as the second seawater inlet piping system 53A, thereby increasing the temperature of the seawater introduced into the scrubber 20.

[0060] Furthermore, in the first embodiment described above, the supply of heated seawater to the first seawater inlet piping system 52 is switched by opening or closing the temperature adjustment valve 72A, but it is not limited to this.

[0061] Figure 4 This is a diagram illustrating a modified example of the seawater introduction system according to the first embodiment of the present invention.

[0062] like Figure 4 As shown, in addition to temperature regulating valve 72A, temperature regulating valve 72B can also be provided on connecting pipe 71A. In this case, when temperature regulating valve 72A is open, temperature regulating valve 72B is closed, and when temperature regulating valve 72A is closed, temperature regulating valve 72B is open. Furthermore, when adjusting the opening degree of temperature regulating valves 72A and 72B, the opening degree is adjusted so that the combined opening degree of temperature regulating valve 72A and temperature regulating valve 72B is 100%.

[0063] <Second Implementation>

[0064] Next, a second embodiment of the ship according to the present invention will be described. In the second embodiment described below, since the structure of the heating section is different from that of the first embodiment, the same reference numerals are used to describe the parts that are the same as those in the first embodiment, and repeated descriptions are omitted.

[0065] Figure 5 This is a diagram showing the schematic structure of the seawater introduction system according to the second embodiment of the present invention.

[0066] like Figure 5 As shown, the seawater introduction system 50B of the ship 1 in this embodiment includes at least 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 drainage piping system 55, a first heat exchanger 61, and a second heat exchanger 62.

[0067] One end of the second seawater inlet piping system 53B is connected to the intake piping system 51 between on / off valves 51v and 51w. The other end of the second seawater inlet piping system 53B opens outwards from the ship. The second seawater inlet piping system 53B is equipped with an inlet valve 53v, a pump 53p, a first heat exchanger 61, and an outlet valve 53w.

[0068] A first heat exchanger 61 is located midway through the second seawater inlet piping system 53B. The first heat exchanger 61 facilitates heat exchange between the seawater introduced into the second seawater inlet piping system 53B and the coolant used to cool the combustion device 8. The seawater is heated through the heat exchange in the first heat exchanger 61.

[0069] One end of the third seawater inlet piping system 54B is connected to the intake piping system 51 between on / off valves 51v and 51w. The other end of the third seawater inlet piping system 54B opens outwards from the ship. The third seawater inlet piping system 54B is equipped with an inlet valve 54v, a pump 54p, a second heat exchanger 62, and an outlet valve 54w.

[0070] The second heat exchanger 62 is located midway through 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 the coolant used to cool heat sources other than the combustion device 8. Furthermore, although an example is shown where the first heat exchanger 61 is a larger heat exchanger than the second heat exchanger 62, the system is not limited to this configuration.

[0071] (Structure of the heating section)

[0072] Similar to the heating unit 70A in the first embodiment, the heating unit 70B of the ship 1 in this second embodiment is configured to heat the seawater flowing through the first seawater inlet piping system 52. The heating unit 70B in this second embodiment can introduce seawater passing through both the first heat exchanger 61 and the second heat exchanger 62 into the first seawater inlet piping system 52. The heating unit 70B can also introduce seawater passing through the first heat exchanger 61 from the second seawater inlet piping system 53B through the third seawater inlet piping system 54B into the first seawater inlet piping system 52. The heating unit 70B can also introduce seawater passing through the second heat exchanger 62 from the third seawater inlet piping system 54B into the first seawater inlet piping system 52.

[0073] The heating unit 70B includes a first connecting pipe 73, a first temperature regulating valve 74, a second connecting pipe 75, and a second temperature regulating valve 76.

[0074] One end of the first connecting pipe 73 is connected to a second seawater inlet piping system 53B located downstream of the first heat exchanger 61. The other end of the first connecting pipe 73 is connected to a third seawater inlet piping system 54B between the inlet valve 54v and the pump 54p. Through this first connecting pipe 73, the second seawater inlet piping system 53B and the third seawater inlet piping system 54B are connected in a communicative manner. The first connecting pipe 73 delivers seawater from the second seawater inlet piping system 53B to the third seawater inlet piping system 54B, after passing through the first heat exchanger 61. Thus, the seawater flowing in the third seawater inlet piping system 54B is mixed with seawater that has been heated by the first heat exchanger 61.

[0075] The first temperature regulating valve 74 can intermittently introduce seawater heated by the first heat exchanger 61 into the third seawater inlet piping system 54B. For example, by closing the first temperature regulating valve 74, the flow rate of seawater introduced into the third seawater inlet piping system 54B via the first connecting pipe 73 increases; by opening the first temperature regulating valve 74, the flow rate of seawater introduced into the third seawater inlet piping system 54B via the first connecting pipe 73 decreases. The first temperature regulating valve 74 is, for example, located downstream of the connection between the first connecting pipe 73 and the second seawater inlet piping system 53B. The first temperature regulating valve 74 can be, for example, a three-way valve installed at the connection between the second seawater inlet piping system 53B and the first connecting pipe 73. Here, at least when the first temperature regulating valve 74 is open, the aforementioned outlet valve 53w is also open.

[0076] The first temperature regulating valve 74 includes a temperature sensor 74s. The temperature sensor 74s is located downstream of the connection point to the other end of the first connecting pipe 73 in the third seawater inlet piping system 54B, and detects the temperature of the seawater flowing through the third seawater inlet piping system 54B. That is, the temperature sensor 74s detects the temperature of the seawater in the third seawater inlet piping system 54B after the seawater heated by the first heat exchanger 61 has been mixed with the seawater.

[0077] One end of the second connecting pipe 75 is connected to a third seawater inlet piping system 54B, located downstream of the second heat exchanger 62. The other end of the second connecting pipe 75 is connected to a first seawater inlet piping system 52, located between the inlet valve 52v and the pump 52p. The second connecting pipe 75 supplies seawater that has passed through the second heat exchanger 62 from the third seawater inlet piping system 54B into the first seawater inlet piping system 52. Thus, the seawater flowing in the first seawater inlet piping system 52 is mixed with the seawater that has been heated by the second heat exchanger 62.

[0078] The second temperature regulating valve 76 can intermittently introduce seawater heated by the second heat exchanger 62 into the first seawater inlet piping system 52. For example, by closing the second temperature regulating valve 76, the flow rate of seawater introduced into the first seawater inlet piping system 52 via the second connecting pipe 75 increases; by opening the second temperature regulating valve 76, the flow rate of seawater introduced into the first seawater inlet piping system 52 via the second connecting pipe 75 decreases. The second temperature regulating valve 76 is, for example, located downstream of the connection between the second connecting pipe 75 and the third seawater inlet piping system 54B. The second temperature regulating valve 76 can be, for example, a three-way valve installed at the connection between the third seawater inlet piping system 54B and the second connecting pipe 75. Here, at least when the second temperature regulating valve 76 is open, the aforementioned outlet valve 54w is also open.

[0079] Similar to the first temperature regulating valve 74, the second temperature regulating valve 76 includes a temperature sensor 76s. The temperature sensor 76s detects the temperature of the seawater flowing through the first seawater inlet piping system 52 at a position downstream of the connection point at the other end of the second connecting pipe 75. That is, the temperature sensor 76s detects the temperature of the seawater within the first seawater inlet piping system 52 after the seawater, heated by the second heat exchanger 62, has been mixed with the seawater.

[0080] Figure 6 This diagram illustrates the state in which seawater, after passing through a first heat exchanger and a second heat exchanger, is sent into a first seawater inlet piping system in the seawater inlet system according to the second embodiment of the present invention.

[0081] like Figure 6 As shown, the first temperature regulating valve 74 and the second temperature regulating valve 76 close when the temperature of the seawater detected by temperature sensors 74s and 76s is lower than a preset threshold (e.g., 32°C). Thus, the seawater heated by the first heat exchanger 61 is sent from the second seawater inlet piping system 53B to the third seawater inlet piping system 54B via the first connecting pipe 73. The seawater mixed with the seawater from the first heat exchanger 61 is sent to the second heat exchanger 62 via the third seawater inlet piping system 54B, where it is further heated. Furthermore, in the first seawater inlet piping system 52, the seawater heated in two stages by the first heat exchanger 61 and the second heat exchanger 62 is mixed.

[0082] Furthermore, the first temperature regulating valve 74 and the second temperature regulating valve 76 open when the temperature of the seawater detected by the temperature sensors 74s and 76s is above the threshold. Therefore, seawater passing through the first heat exchanger 61 and the second heat exchanger 62 will not be introduced into the first seawater piping system 52.

[0083] (Effects)

[0084] In the ship 1 of the second embodiment described above, similarly to the first embodiment, the temperature of the seawater introduced into the scrubber 20 can be increased, thereby increasing the temperature of the exhaust gas that is scrubbed by seawater in the scrubber 20 and transported to the recovery device 30. Therefore, when using seawater to desulfurize the exhaust gas, the temperature drop of the desulfurized exhaust gas can be suppressed. As a result, the reduction in recovery efficiency when recovering carbon dioxide contained in the exhaust gas by the recovery device 30 can be suppressed.

[0085] Furthermore, in the second embodiment described above, seawater introduced from outside the hull 2 ​​into the third seawater inlet piping system 54B is heated by exchanging heat with coolant used to cool heat sources other than the combustion device 8 through the second heat exchanger 62. The seawater heated by the second heat exchanger 62 can be introduced from the third seawater inlet piping system 54B into the first seawater inlet piping system 52, thus increasing the temperature of the seawater introduced into the scrubber 20. Therefore, to increase the temperature of the seawater introduced into the scrubber 20, the waste heat from heat sources other than the combustion device 8 can be utilized, thereby further improving the efficiency of heat energy generated within the hull 2.

[0086] Furthermore, in the second embodiment described above, the second seawater inlet piping system 53B and the third seawater inlet piping system 54B are connected in a communicative manner. This allows seawater, heated by passing through both the first heat exchanger 61 and the second heat exchanger 62, to be introduced into the first seawater inlet piping system 52. Therefore, the waste heat generated within the ship 1 can be utilized to more effectively increase the temperature of the seawater introduced into the scrubber 20.

[0087] (A variation of the second embodiment)

[0088] In the second embodiment described above, similar to the variation of the first embodiment described above, in addition to the first temperature regulating valve 74 and the second temperature regulating valve 76, a temperature regulating valve may also be provided on the first connecting pipe 73, the connecting pipe 71A, and the second connecting pipe 75.

[0089] <Third Implementation Method>

[0090] Next, a third embodiment of the ship according to the present invention will be described. In the third embodiment described below, only the structure of the heating section differs from that of the first and second embodiments. Therefore, the same reference numerals are used to describe the parts that are the same as those in the first and second embodiments, and repeated descriptions are omitted.

[0091] Figure 7 This is a diagram showing the schematic structure of the seawater introduction system according to the third embodiment of the present invention.

[0092] like Figure 7 As shown, the seawater introduction system 50C of the ship 1 in the third embodiment includes at least 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 drainage piping system 55, a first heat exchanger 61, and a third heat exchanger 63.

[0093] One end of the second seawater inlet piping system 53C is connected to the water intake piping system 51 between on / off valves 51v and 51w. The other end of the second seawater inlet piping system 53C opens outwards from the ship. The second seawater inlet piping system 53C is equipped with an inlet valve 53v, a pump 53p, a first heat exchanger 61, and an outlet valve 53w.

[0094] One end of the branch pipe system 58 is connected to the first seawater inlet pipe system 52, which is located downstream of the pump 52p. The branch pipe system 58 branches off from the first seawater inlet pipe system 52 and is able to introduce a portion of the seawater flowing in the first seawater inlet pipe system 52. The other end of the branch pipe system 58 is connected to the connecting pipe 71C, which will be described later.

[0095] The third heat exchanger 63 is located midway through the branch pipe system 58. The third heat exchanger 63 exchanges heat between the seawater introduced into the branch pipe system 58 and the coolant used to cool heat sources other than the combustion device 8. The seawater is heated through the heat exchange in the third heat exchanger 63. Furthermore, although an example is shown where the first heat exchanger 61 is a larger heat exchanger than the third heat exchanger 63, the system is not limited to this configuration.

[0096] (Structure of the heating section)

[0097] Similar to the heating unit 70A of the first embodiment described above, the heating unit 70C of the ship 1 in this third embodiment is configured to heat the seawater flowing through the first seawater inlet piping system 52. The heating unit 70C in this third embodiment can introduce seawater passing through the first heat exchanger 61 from the second seawater inlet piping system 53C to the first seawater inlet piping system 52. Furthermore, the heating unit 70C can introduce seawater passing through the third heat exchanger 63 from the branch piping system 58 to the first seawater inlet piping system 52. The heating unit 70C includes a connecting pipe 71C and a temperature regulating valve 72C.

[0098] One end of the connecting pipe 71C is connected to the second seawater inlet piping system 53C, which is located downstream of the first heat exchanger 61. The other end of the connecting pipe 71C is connected to the first seawater inlet piping system 52, which is located between the inlet valve 52v and the pump 52p. The other end of the aforementioned branch piping system 58 is connected midway through the connecting pipe 71C. That is, the connecting pipe 71C can deliver seawater that has passed through the first heat exchanger 61 and the third heat exchanger 63 into the first seawater inlet piping system 52. Thus, the seawater flowing in the first seawater inlet piping system 52 can be mixed with the seawater heated by passing through the first heat exchanger 61 and the third heat exchanger 63. Alternatively, the branch piping system 58 can be directly connected to the first seawater inlet piping system 52 without being connected to the connecting pipe 71C.

[0099] The temperature regulating valve 72C can intermittently introduce seawater heated by the first heat exchanger 61 into the first seawater inlet piping system 52. For example, by closing the temperature regulating valve 72C, the flow rate of seawater introduced from the second seawater inlet piping system 53C to the first seawater inlet piping system 52 via the connecting pipe 71C increases; by opening the temperature regulating valve 72C, the flow rate of seawater introduced from the second seawater inlet piping system 53C to the first seawater inlet piping system 52 via the connecting pipe 71C decreases. The temperature regulating valve 72C is, for example, located downstream of the connection between the connecting pipe 71C and the second seawater inlet piping system 53C. The temperature regulating valve 72C may be, for example, a three-way valve installed at the connection between the second seawater inlet piping system 53C and the connecting pipe 71C. Here, similar to the first embodiment, at least when the temperature regulating valve 72C is open, the outlet valve 53w is also open.

[0100] The temperature regulating valve 72C includes a temperature sensor 72s. The temperature sensor 72s is located downstream of the connection point to which the other end of the connecting pipe 71C is connected in the first seawater inlet piping system 52, and detects the temperature of the seawater flowing through the first seawater inlet piping system 52. That is, the temperature sensor 72s detects the temperature of the seawater within the first seawater inlet piping system 52 after the seawater, heated by passing through the first heat exchanger 61 and the third heat exchanger 63, has been mixed.

[0101] Temperature regulating valve 72C is opened when the temperature of the seawater detected by temperature sensor 72s is above a preset threshold. In this case, seawater passing through the first heat exchanger 61 is not introduced into the first seawater inlet piping system 52. However, a portion of the seawater in the first seawater inlet piping system 52 is introduced into the branch piping system 58 and returned to the first seawater inlet piping system 52 via connecting pipe 71C. At this time, the seawater introduced into the branch piping system 58 undergoes heat exchange through the third heat exchanger 63, and its temperature rises.

[0102] Figure 8 This diagram illustrates the state in which seawater passing through the first heat exchanger and the third heat exchanger is sent into the first seawater inlet piping system in the seawater inlet system according to the third embodiment of the present invention.

[0103] like Figure 8 As shown, when the temperature of the seawater detected by the temperature sensor 72s is lower than a preset threshold, the temperature regulating valve 72C closes. Consequently, the seawater passing through the first heat exchanger 61 merges with the seawater passing through the third heat exchanger 63 and is then fed into the first seawater inlet piping system 52 via the connecting pipe 71C. Then, the temperature of the seawater introduced into the scrubber 20 through the first seawater inlet piping system 52 increases.

[0104] Furthermore, when the temperature of the seawater detected by the temperature sensor 72s is above the threshold, the temperature regulating valve 72C will not introduce the seawater that has passed through the first heat exchanger 61 and the third heat exchanger 63 through the connecting pipe 71C into the first seawater inlet piping system 52.

[0105] (Effects)

[0106] In the ship 1 of the third embodiment described above, similarly to the first and second embodiments, the temperature of the seawater introduced into the scrubber 20 is also increased, which can raise the temperature of the exhaust gas that is washed by seawater in the scrubber 20 and transported to the recovery device 30. Therefore, when using seawater to desulfurize the exhaust gas, the temperature drop of the exhaust gas after desulfurization can be suppressed. As a result, the reduction in recovery efficiency when recovering carbon dioxide contained in the exhaust gas by the recovery device 30 can be suppressed.

[0107] Furthermore, in the third embodiment described above, the seawater introduced from the first seawater inlet piping system 52 to the branch piping system 58 is heated by heat exchange with the coolant of the heat source other than the cooling combustion device 8 through the third heat exchanger 63. Then, the seawater heated by the third heat exchanger 63 is continuously introduced from the branch piping system 58 to the first seawater inlet piping system 52. Therefore, the heat energy generated within the hull 2 ​​can be effectively utilized, thereby consistently maintaining the temperature of the seawater introduced into the scrubber 20.

[0108] Furthermore, in the third embodiment described above, the seawater introduced from outside the hull 2 ​​into the second seawater inlet piping system 53C is heated by heat exchange with the coolant used to cool the combustion device 8 through the first heat exchanger 61. Then, if the temperature of the seawater detected by the temperature sensor 72s is lower than a preset threshold, the seawater heated by the first heat exchanger 61 is introduced from the second seawater inlet piping system 53C into the first seawater inlet piping system 52. Therefore, when the temperature of the seawater detected by the temperature sensor 72s is lower than the preset threshold, the temperature of the seawater introduced into the scrubber 20 can be increased compared to the case where only the seawater heated by the third heat exchanger 63 is introduced into the first seawater inlet piping system 52.

[0109] (A variation of the third embodiment)

[0110] In the third embodiment described above, similar to the variation of the first embodiment described above, in addition to the temperature regulating valve 72C, a temperature regulating valve may also be provided in the connecting pipe 71C.

[0111] (Other implementation methods)

[0112] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the specific structure is not limited to these embodiments and may include design changes that do not depart from the spirit of the present invention.

[0113] In addition, in the above embodiments, for example, the first heat exchanger 61, the second heat exchanger 62, and the third heat exchanger 63 can be interchanged.

[0114] Furthermore, in the above embodiments, temperature adjustment valves 72A to 72C are provided for opening and closing. However, the opening degree of temperature adjustment valves 72A to 72C can also be adjusted according to the temperature of the seawater supplied to the scrubber 20 through the first seawater inlet piping system 52.

[0115] Furthermore, the above embodiments include temperature regulating valves 72A to 72C, which are switched on and off according to the temperature of the seawater supplied to the scrubber 20, but are not limited thereto. For example, seawater heated by the first heat exchanger 61, the second heat exchanger 62, and the third heat exchanger 63 may be supplied to the scrubber 20 at all times.

[0116] Furthermore, the structures of the above embodiments can be appropriately combined. As an example, the structure of the branch pipe system 58 and the third heat exchanger 63 of the third embodiment can be applied to the seawater introduction system 50B of the second embodiment.

[0117] Furthermore, in the above embodiments, the scrubber 20 desulfurizes the exhaust gas, but the scrubber 20 is not limited to desulfurization; it can also wash away unwanted components or impurities in the exhaust gas.

[0118] <Postscript>

[0119] The ship 1 described in each embodiment can be understood, for example, as follows.

[0120] (1) The vessel 1 involved in the first method comprises: a hull 2; a combustion device 8 disposed on the hull 2 ​​and for burning fuel; a scrubber 20 disposed on the hull 2 ​​and for washing the exhaust gas from the combustion device 8 with seawater; a recovery device 30 disposed on the hull 2 ​​and for recovering carbon dioxide from the exhaust gas passing through the scrubber 20; a first seawater inlet piping system 52 capable of introducing seawater from the outside of the hull 2 ​​to the scrubber 20; and a heating section 70A to 70C capable of heating the seawater flowing in the first seawater inlet piping system 52.

[0121] As a result, the temperature of the seawater introduced into the scrubber 20 increases, and the temperature of the exhaust gas, after being washed in the scrubber 20 and delivered to the recovery unit 30, also increases. Thus, when using seawater to wash the exhaust gas, the temperature drop of the exhaust gas after washing can be suppressed. Consequently, the reduction in recovery efficiency when recovering carbon dioxide contained in the exhaust gas by the recovery unit 30 can be suppressed.

[0122] (2) The vessel 1 involved in the second method is the vessel 1 of (1), which includes: a second seawater inlet piping system 53A to 53C, which can introduce seawater from the outside of the hull 2; and a first heat exchanger 61, which performs heat exchange between the seawater introduced into the second seawater inlet piping system 53A to 53C and the coolant used to cool the combustion device 8, wherein the heating section 70A to 70C can introduce the seawater passing through the first heat exchanger 61 from the second seawater inlet piping system 53A to 53C into the first seawater inlet piping system 52.

[0123] Therefore, seawater heated by the first heat exchanger 61 can be introduced from the second seawater inlet piping system 53A-53C to the first seawater inlet piping system 52, thereby increasing the temperature of the seawater introduced into the scrubber 20. Thus, to increase the temperature of the seawater introduced into the scrubber 20, there is no need for a dedicated heating mechanism; by utilizing the waste heat from the combustion device 8, the heat energy generated within the hull 2 ​​can be effectively utilized. Furthermore, the energy required for a dedicated heating mechanism can be reduced.

[0124] (3) The vessel 1 involved in the third method is the vessel 1 of (2), which includes: a third seawater inlet piping system 54B, which is capable of introducing seawater from the outside of the hull 2; and a second heat exchanger 62, which performs heat exchange between the seawater introduced into the third seawater inlet piping system 54B and the coolant used to cool the heat source installed on the hull 2 ​​other than the combustion device 8, and the heating unit 70B is capable of introducing the seawater passing through the second heat exchanger 62 from the third seawater inlet piping system 54B to the first seawater inlet piping system 52.

[0125] Therefore, seawater heated by the second heat exchanger 62 can be introduced from the third seawater inlet piping system 54B to the first seawater inlet piping system 52, thereby increasing the temperature of the seawater introduced into the scrubber 20. Thus, in order to increase the temperature of the seawater introduced into the scrubber 20, the waste heat from heat sources other than the combustion device 8 can be utilized to further effectively utilize the heat energy generated within the hull 2.

[0126] (4) The vessel 1 involved in the fourth method is the vessel 1 of (3), wherein the second seawater inlet piping system 53B and the third seawater inlet piping system 54B are connected in a communicative manner, and the heating unit 70B can introduce seawater that has passed through the first heat exchanger 61 and the second heat exchanger 62 into the first seawater inlet piping system 52.

[0127] Therefore, seawater heated by passing through the first heat exchanger 61 and the second heat exchanger 62 can be introduced into the first seawater inlet piping system 52. Thus, the temperature of the seawater introduced into the scrubber 20 can be increased more effectively.

[0128] (5) The vessel 1 involved in the fifth method is any one of (1) to (4) and includes: a branch pipe system 58 that branches from the first seawater inlet pipe system 52 and is capable of introducing a portion of seawater from the first seawater inlet pipe system 52; and a third heat exchanger 63 that performs heat exchange between the seawater introduced into the branch pipe system 58 and the coolant used to cool the heat source provided on the hull 2 ​​other than the combustion device 8, wherein the heating unit 70C is capable of introducing seawater through the third heat exchanger 63 from the branch pipe system 58 into the first seawater inlet pipe system 52.

[0129] Therefore, seawater heated by the third heat exchanger 63 can be introduced from the branch piping system 58 to the first seawater inlet piping system 52, thereby increasing the temperature of the seawater introduced into the scrubber 20. Thus, in order to increase the temperature of the seawater introduced into the scrubber 20, the waste heat from heat sources other than the combustion device 8 can be utilized, thereby further improving the efficiency of the heat energy generated within the hull 2.

[0130] Industrial availability

[0131] According to the present invention, when using seawater to wash the exhaust gas, the temperature of the exhaust gas after washing can be suppressed.

[0132] Symbol Explanation

[0133] 1-Ship, 2-Hull, 2b-Stern, 3A, 3B-Side, 4-Bottom, 5-Upper Deck, 6-Superstructure, 8-Combustion Device, 20-Scrubber, 30-Recovery Device, 50A~50C-Seawater Intake System, 51-Intake Piping System, 51v, 51w-On / Off Valves, 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-Drainage piping system, 55V-Outlet valve, 56-First water intake, 57-Second water intake, 58-Branch piping system, 61-First heat exchanger, 62-Second heat exchanger, 63-Third heat exchanger, 70A~70C-Heating section, 71A, 71C-Connecting pipe, 72A, 72B, 72C-Temperature regulating valve, 72S-Temperature sensor, 73-First connecting pipe, 74-First temperature regulating valve, 74S-Temperature sensor, 75-Second connecting pipe, 76-Second temperature regulating valve, 76S-Temperature sensor, 101-Exhaust gas piping system, 102-Exhaust gas pipe.

Claims

1. A ship having: hull; A combustion device is installed on the hull to burn fuel; A scrubber is installed on the hull and washes the exhaust gas from the combustion device with seawater; A recovery device is installed on the hull and recovers carbon dioxide from the exhaust gas passing through the scrubber; A first seawater inlet piping system is capable of introducing seawater from outside the hull to the scrubber; and The heating section is capable of heating the seawater flowing through the first seawater inlet piping system.

2. The vessel according to claim 1, comprising: A second seawater inlet piping system is available to introduce seawater from outside the hull; and The first heat exchanger facilitates heat exchange between seawater introduced into the second seawater inlet piping system and coolant used to cool the combustion device. The heating unit can introduce seawater that has passed through the first heat exchanger from the second seawater inlet piping system to the first seawater inlet piping system.

3. The vessel according to claim 2, comprising: A third seawater inlet piping system is capable of introducing seawater from outside the hull; and The second heat exchanger exchanges heat between the seawater introduced into the third seawater inlet piping system and the coolant used to cool heat sources installed on the hull, excluding the combustion device. The heating unit can introduce seawater that has passed through the second heat exchanger from the third seawater inlet piping system to the first seawater inlet piping system.

4. The vessel according to claim 3, wherein, The second seawater inlet piping system is communicatively connected to the third seawater inlet piping system. The heating section can guide seawater that has passed through the first heat exchanger and the second heat exchanger into the first seawater inlet piping system.

5. The vessel according to claim 1 or 2, comprising: A branch piping system, branching off from the first seawater inlet piping system, and capable of introducing a portion of seawater from the first seawater inlet piping system; and The third heat exchanger facilitates heat exchange between the seawater introduced into the branch piping system and the coolant used to cool heat sources other than the combustion device located on the hull. The heating section is capable of introducing seawater, which has passed through the third heat exchanger, from the branch piping system into the first seawater inlet piping system.

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