Marine vessel

Abstract

This marine vessel comprises: a hull; a combustion device that is provided to the hull and combusts fuel; and an exhaust gas treatment system that is provided to the hull and treats exhaust gas from the combustion device. The exhaust gas treatment system comprises: a pretreatment unit that includes a plurality of pretreatment devices for performing pretreatment on the exhaust gas to generate treated gas, and a first switching unit capable of selectively introducing the exhaust gas into at least one of the plurality of pretreatment devices; and a carbon dioxide recovery unit that has a plurality of absorption unit bodies capable of recovering carbon dioxide from the treated gas, and a second switching unit capable of selectively introducing the treated gas into at least one of the plurality of absorption unit bodies.

Description

Ship

[0001] This disclosure relates to a ship. This application claims priority to Japanese Patent Application No. 2025-011448 filed in Japan on January 27, 2025, the content of which is incorporated herein by reference.

[0002] Patent Document 1 discloses a configuration including a recovery device that performs a process of recovering carbon dioxide from exhaust gas generated by burning natural gas. Further, in this Patent Document 1, prior to performing the process of recovering carbon dioxide with the recovery device, a cooling device for cooling the exhaust gas and a drying device for drying the exhaust gas are provided in front of the recovery device as a pretreatment device.

[0003] Japanese Patent Application Laid-Open No. 2017-176954

[0004] By the way, in a ship, the amount of exhaust gas from a combustion device such as a main engine varies according to the load of the combustion device. Therefore, the pretreatment device and the recovery device are sized according to the amount of exhaust gas when the load of the combustion device is maximum. Along with this, the pretreatment device and the recovery device may become larger. Also, among the pretreatment device and the recovery device, those in the shape of a tower may have a large height, which may have an adverse effect on ensuring visibility, the stability of the ship, etc.

[0005] This disclosure has been made to solve the above problems, and an object thereof is to provide a ship capable of suppressing the enlargement of the device.

[0006] To solve the above problems, the vessel according to this disclosure comprises a hull, a combustion device, and an exhaust gas treatment system. The combustion device is provided in the hull and burns fuel. The exhaust gas treatment system is provided in the hull and treats the exhaust gas from the combustion device. The exhaust gas treatment system comprises a pretreatment unit and a carbon dioxide recovery unit. The pretreatment unit comprises a plurality of pretreatment devices and a first switching unit. The plurality of pretreatment devices pretreatment the exhaust gas to generate a treated gas. The first switching unit can selectively introduce the exhaust gas into at least one of the plurality of pretreatment devices. The carbon dioxide recovery unit comprises a plurality of absorption unit bodies and a second switching unit. The absorption unit bodies can recover carbon dioxide from the treated gas. The second switching unit can selectively introduce the treated gas into at least one of the plurality of absorption unit bodies.

[0007] According to the vessel described in this disclosure, it is possible to keep the size of the equipment down.

[0008] This is a side view of a vessel according to an embodiment of the present disclosure. This is a diagram showing the configuration of the exhaust gas treatment system of a vessel according to an embodiment of the present disclosure. This is a diagram showing the configuration of the pretreatment unit of the exhaust gas treatment system according to an embodiment of the present disclosure. This is a diagram showing the configuration of the absorption section of the carbon dioxide recovery unit of the exhaust gas treatment system according to an embodiment of the present disclosure. This is a diagram showing the configuration of the regeneration section of the carbon dioxide recovery unit of the exhaust gas treatment system according to an embodiment of the present disclosure. This is a diagram showing the configuration of the pretreatment unit of the exhaust gas treatment system according to a modified example of an embodiment of the present disclosure.

[0009] Hereinafter, a vessel according to the embodiment of this disclosure will be described with reference to Figures 1 to 6. (Overall configuration of the vessel) As shown in Figure 1, the vessel 1 of this embodiment comprises a hull 2, a combustion device 8, and an exhaust gas treatment system 20. Note that the type of vessel 1 of this embodiment is not limited to a specific type of vessel. Examples of vessel types for the vessel 1 include container ships, liquefied gas carriers, ferries, RORO ships, car carriers, passenger ships, etc.

[0010] (Hull Structure) The hull 2 ​​has a pair of side panels 3A and 3B that form its outer shell, a bottom 4, and an upper deck 5. The side panels 3A and 3B each have a pair of side platings that form the left and right sides, respectively. The bottom 4 has bottom platings that connect these side panels 3A and 3B. The upper deck 5 is a full-length deck that is exposed to the outside, and a superstructure 6 containing living quarters is formed on this upper deck 5.

[0011] The combustion device 8 is a device that generates thermal energy by burning fuel and is installed inside the hull 2 ​​described above. Examples of combustion devices 8 include an internal combustion engine used as 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] (Configuration of Exhaust Gas Treatment System) Figure 2 is a diagram showing the configuration of an exhaust gas treatment system for a ship according to an embodiment of the present disclosure. The exhaust gas treatment system 20 is provided in the hull 2. As shown in Figure 2, the exhaust gas treatment system 20 treats exhaust gas G1 from the combustion device 8. The exhaust gas treatment system 20 comprises a pretreatment unit 30, a carbon dioxide recovery unit 40, and a control unit 90. As shown in Figure 1, the pretreatment unit 30 and the carbon dioxide recovery unit 40 of this embodiment are provided on the upper deck 5. The pretreatment unit 30 and the carbon dioxide recovery unit 40 may be provided inside the hull 2.

[0013] Figure 3 is a diagram showing the configuration of the pretreatment unit of an exhaust gas treatment system according to the present disclosure. As shown in Figures 2 and 3, the pretreatment unit 30 comprises a plurality of pretreatment devices 31, a first upstream header 32, a first downstream header 33, and a first switching unit 35.

[0014] In this embodiment, for example, three pretreatment devices 31 are provided. The number of pretreatment devices 31 is not limited to three; it may be two, four or more. Each of the multiple pretreatment devices 31 pretreatments the exhaust gas G1 to generate treated gas G2. The multiple pretreatment devices 31 apply the same pretreatment to the exhaust gas G1. The multiple pretreatment devices 31 may have the same configuration or different configurations. An example of the pretreatment performed by each pretreatment device 31 in this embodiment is a process to reduce the temperature of the high-temperature exhaust gas G1 discharged from the combustion device 8. Note that the pretreatment applied to the exhaust gas G1 by the pretreatment device 31 is not limited to a temperature reduction process; it may be other processes such as cleaning the exhaust gas G1 or reducing the concentration of nitrogen oxides.

[0015] As shown in Figure 3, the pretreatment device 31 of this embodiment is, for example, a scrubber, and mainly comprises a tower body 31a, a treatment liquid spraying unit 31b, and a circulation line 31c.

[0016] The tower body 31a has a hollow shape with space inside. The main body 52 of this embodiment extends, for example, in the vertical direction. The tower bodies 31a of the multiple pretreatment devices 31 of this embodiment are arranged side by side with spacing between them in the horizontal direction. The multiple pretreatment devices 31 of this embodiment are equipped with tower bodies 31a of the same size. However, the tower bodies 31a of the multiple pretreatment devices 31 may be of different sizes. Exhaust gas G1 from the combustion device 8 flows into the tower body 31a through the first connection line 36, which will be described later.

[0017] The treatment liquid spraying unit 31b sprays the treatment liquid into the tower body 31a. Examples of treatment liquids include seawater, fresh water, and seawater or fresh water with added caustic soda.

[0018] The circulation line 31c connects the bottom of the tower body 31a to the treatment liquid spraying section 31b. A pump 31p is installed in the middle of the circulation line 31c. The circulation line 31c circulates the treatment liquid from the bottom of the tower body 31a to the treatment liquid spraying section 31b.

[0019] As a result, the exhaust gas G1 that flows into the tower body 31a comes into contact with the treatment liquid sprayed from the treatment liquid spraying section 31b, causing the temperature of the exhaust gas G1 to decrease. In addition, soot and nitrogen oxides contained in the exhaust gas G1 are captured by the treatment liquid.

[0020] The first upstream header 32 is provided upstream of the multiple pretreatment devices 31 in the flow direction of the exhaust gas G1. The first upstream header 32 is connected to the combustion device 8 via the exhaust gas line 101. Exhaust gas G1 from the combustion device 8 flows into the first upstream header 32 through the exhaust gas line 101. In this embodiment, the first upstream header 32 extends horizontally and has a larger flow path area than the exhaust gas line 101. As a result, the flow velocity of the exhaust gas G1 flowing into the first upstream header 32 decreases and the static pressure recovers (the same applies to each header described below).

[0021] The first switching unit 35 is capable of selectively introducing exhaust gas G1 to at least one of the pretreatment devices 31. The first switching unit 35 comprises a plurality of first connection lines 36 and a plurality of first on-off valves 36v. The plurality of first connection lines 36 connect the first upstream header 32 to each of the plurality of pretreatment devices 31. The plurality of first on-off valves 36v are provided in the middle of the plurality of first connection lines 36 and open and close each of the plurality of first connection lines 36. By opening the first on-off valves 36v, exhaust gas G1 from the combustion device 8 is introduced to the pretreatment device 31 through the first upstream header 32 and the first connection lines 36.

[0022] The first downstream header 33 is located downstream of the multiple pretreatment devices 31 in the flow direction of the exhaust gas G1. The first downstream header 33 and each of the multiple pretreatment devices 31 are connected via multiple first downstream connection lines 37. An on-off valve 37v is provided in the middle of each of the multiple first downstream connection lines 37 to open and close each of the first downstream connection lines 37. The processed gas G2 that has been treated by the multiple pretreatment devices 31 flows into the first downstream header 33 through the multiple first downstream connection lines 37 by opening the on-off valve 37v.

[0023] (Configuration of the carbon dioxide capture unit) As shown in Figure 2, the carbon dioxide capture unit 40 of this embodiment includes, for example, an absorption unit 50, a regeneration unit 60, a liquefaction unit 70, and a storage unit 80.

[0024] Figure 4 is a diagram showing the configuration of the absorption section of the carbon dioxide recovery unit of the exhaust gas treatment system according to the present disclosure. As shown in Figures 2 and 4, the absorption section 50 comprises a plurality of absorption section bodies 51, a second upstream header 52, a second downstream header 53, and a second switching section 55.

[0025] In this embodiment, for example, three absorption unit bodies 51 are provided. The number of multiple absorption unit bodies 51 is not limited to three; it may be two, four or more. The number of multiple absorption unit bodies 51 may be the same as or different from the number of multiple pretreatment devices 31. The multiple absorption unit bodies 51 may have the same configuration or different configurations.

[0026] Each of the multiple absorption units 51 recovers carbon dioxide contained in the processed gas G2 that has passed through the pre-treatment unit 30. One method for recovering carbon dioxide in the absorption unit 51 is a chemical absorption method in which carbon dioxide is absorbed by an absorbent liquid L. In the case of chemical absorption of carbon dioxide, MEA (monoethanolamine) can be used as the absorbent liquid L. The configuration of the absorption unit 51 is not limited in any way. The absorption unit 51 may be of a different type.

[0027] As shown in Figure 4, the absorption unit body 51 of this embodiment is a so-called absorption tower, and mainly comprises a tower body 51a, an absorption liquid spraying unit 51b, and a circulation line 51c.

[0028] The tower body 51a is formed in a cylindrical shape extending in the vertical direction Dv. The tower bodies 51a of the multiple absorption unit bodies 51 in this embodiment are arranged side by side with spacing between them in the horizontal direction. The multiple absorption unit bodies 51 in this embodiment are all equipped with tower bodies 51a of the same size. However, the tower bodies 51a may be of different sizes in the multiple absorption unit bodies 51. Processed gas G2 from the pre-treatment unit 30 flows into the tower body 51a through the second upstream connection line 56, which will be described later. The absorbent liquid spraying unit 51b sprays the absorbent liquid L into the tower body 51a.

[0029] The circulation line 51c connects the bottom of the tower body 51a to the absorbent liquid spraying section 51b. A pump 51p is provided in the middle of the circulation line 51c. The circulation line 51c circulates the absorbent liquid L from the bottom of the tower body 51a to the absorbent liquid spraying section 51b.

[0030] In the absorption unit body 51, the absorbent liquid L sprayed from the absorbent liquid spraying unit 51b comes into contact with the processed gas G2 that flows into the tower body 51a, and the carbon dioxide contained in the processed gas G2 is absorbed by the absorbent liquid L.

[0031] The second upstream header 52 is located upstream of the multiple absorption unit bodies 51 in the flow direction of the processed gas G2. The second upstream header 52 is connected to the first downstream header 33 via a connection line 102. Processed gas G2 from the pre-treatment unit 30 flows into the second upstream header 52 through the connection line 102.

[0032] The second switching unit 55 is capable of selectively introducing the processed gas G2 into at least one of the absorption unit bodies 51. The second switching unit 55 comprises a plurality of second upstream connection lines 56 and a plurality of second on-off valves 56v. The plurality of second upstream connection lines 56 connect the second upstream header 52 to each of the plurality of absorption unit bodies 51. The plurality of second on-off valves 56v are provided in the middle of the plurality of second upstream connection lines 56 and open and close each of the plurality of second upstream connection lines 56. The processed gas G2 from the pre-treatment unit 30 is introduced to the absorption unit body 51 through the second upstream header 52 and the second upstream connection lines 56 by opening the second on-off valves 56v.

[0033] The second downstream header 53 is located downstream of the multiple absorption unit bodies 51 in the flow direction of the processed gas G2. The second downstream header 53 and each of the multiple absorption unit bodies 51 are connected via multiple second downstream connection lines 57. An on-off valve 57v is provided in the middle of each of the multiple second downstream connection lines 57 to open and close each of the second downstream connection lines 57. The processed gas G3, which has been processed by the multiple absorption unit bodies 51 and from which carbon dioxide has been recovered, flows into the second downstream header 53 through the multiple second downstream connection lines 57 by opening the on-off valve 57v. The processed gas G3 that has flowed into the second downstream header 53 is released into the atmosphere via the exhaust line 105.

[0034] Figure 5 shows the configuration of the regeneration unit of the carbon dioxide recovery unit of the exhaust gas treatment system according to the present disclosure. As shown in Figure 2, the regeneration unit 60 is connected to a plurality of absorption unit bodies 51 of the absorption unit 50 via a connection line 103. As shown in Figures 2 and 5, the regeneration unit 60 includes a plurality of regeneration devices 61, a third upstream header 62, a third downstream header 63, and a third switching unit 65.

[0035] In this embodiment, for example, three regeneration devices 61 are provided. The number of regeneration devices 61 is not limited to three; it may be two, four or more. The number of regeneration devices 61 may be the same as or different from the number of pretreatment devices 31 and multiple absorption unit bodies 51. The regeneration devices 61 may have the same configuration or different configurations.

[0036] Each of the multiple regeneration devices 61 separates gaseous carbon dioxide Gc from the absorbent liquid L that has absorbed carbon dioxide in the absorbent unit body 51. As shown in Figure 5, each of the multiple regeneration devices 61 has a cylindrical tower body 61a extending in the vertical direction Dv. Each regeneration device 61 separates gaseous carbon dioxide Gc from the absorbent liquid L by heating the absorbent liquid L sent from the absorbent unit body 51 to the regeneration device 61 within the tower body 61a, for example, by heat exchange with steam supplied from the outside. The absorbent liquid L regenerated in the multiple regeneration devices 61 is circulated from within the tower body 61a to the multiple absorbent unit bodies 51 of the absorbent unit 50 through connection lines (not shown).

[0037] The third upstream header 62 is provided on the upstream side of the flow direction of the absorbent liquid L relative to the multiple regeneration devices 61. The third upstream header 62 is connected to the absorption unit 50 via a connection line 103. The absorbent liquid L, which has absorbed carbon dioxide in the absorption unit body 51, flows into the third upstream header 62 through the connection line 103.

[0038] The third switching unit 65 is capable of selectively introducing the absorbent liquid L into at least one of the regeneration devices 61. The third switching unit 65 comprises a plurality of third upstream connection lines 66 and a plurality of third on-off valves 66v. The plurality of third upstream connection lines 66 connect the third upstream header 62 to each of the plurality of regeneration devices 61. The plurality of third on-off valves 66v are provided in the middle of the plurality of third upstream connection lines 66 and open and close each of the plurality of third upstream connection lines 66. The absorbent liquid L from the absorption unit body 51 is introduced to the regeneration device 61 through the third upstream header 62 and the third upstream connection lines 66 by opening the third on-off valves 66v.

[0039] The third downstream header 63 is positioned above the multiple regeneration devices 61. The third downstream header 63 and each of the multiple regeneration devices 61 are connected via multiple third downstream connection lines 67. Each of the multiple third downstream connection lines 67 has an on-off valve 67v in the middle, which opens and closes each of the third downstream connection lines 67. The gaseous carbon dioxide Gc separated from the absorbent liquid L by the multiple regeneration devices 61 flows into the third downstream header 63 through the multiple third downstream connection lines 67 by opening the on-off valve 67v.

[0040] As shown in Figure 2, the liquefaction unit 70 is connected to the third downstream header 63 of the regeneration unit 60 via a connection line 104. The liquefaction unit 70 is equipped with a plurality of liquefaction devices 71.

[0041] In this embodiment, for example, three liquefaction devices 71 are provided. The number of liquefaction devices 71 is not limited to three; it may be one, two, or four or more. The number of liquefaction devices 71 may be the same as or different from the number of pretreatment devices 31, absorbent body 51, and regeneration devices 61.

[0042] To each of the plurality of liquefaction devices 71, gaseous carbon dioxide Gc separated from the absorption liquid L is fed from the third downstream header 63 of the regeneration unit 60 through a plurality of branch lines 104s branched from the connection line 104. An on-off valve 104v is provided in each of the plurality of branch lines 104s, enabling selective supply of gaseous carbon dioxide Gc to the plurality of liquefaction devices 71. Each of the plurality of liquefaction devices 71 liquefies carbon dioxide by an appropriate method.

[0043] The storage unit 80 is connected to the plurality of liquefaction devices 71 of the liquefaction unit 70 via the connection line 106. The storage unit 80 includes a plurality of storage tanks 81.

[0044] In the present embodiment, for example, three storage tanks 81 are provided. The number of the plurality of storage tanks 81 is not limited to three, and may be one, two, or four or more. The number of the plurality of storage tanks 81 may be the same as or different from the number of the plurality of pretreatment devices 31, the plurality of absorption unit main bodies 51, the plurality of regeneration devices 61, and the plurality of liquefaction devices 71.

[0045] To each of the plurality of storage tanks 81, liquid carbon dioxide liquefied in the liquefaction unit 70 is fed through a plurality of branch lines 106s branched from the connection line 106. An on-off valve 106v is provided in each of the plurality of branch lines 106s, enabling selective supply of liquid carbon dioxide to the plurality of storage tanks 81. Each of the plurality of storage tanks 81 stores liquid carbon dioxide.

[0046] (Control Unit) The control unit 90 controls the first switching unit 35, the second switching unit 55, and the third switching unit 65 according to the load of the combustion device 8. When the load of the combustion device 8 is small and the amount of exhaust gas G1 from the combustion device 8 is small, the control unit 90 controls the first switching unit 35, the second switching unit 55, and the third switching unit 65 to reduce the number of pretreatment devices 31, the number of absorption unit bodies 51, and the number of regeneration devices 61 that are operated. Conversely, when the load of the combustion device 8 is large and the amount of exhaust gas G1 from the combustion device 8 is large, the control unit 90 controls the first switching unit 35, the second switching unit 55, and the third switching unit 65 to increase the number of pretreatment devices 31, the number of absorption unit bodies 51, and the number of regeneration devices 61 that are operated. Here, the control unit 90 may automatically control the first switching unit 35, the second switching unit 55, and the third switching unit 65 based on a preset program, or it may remotely control the first switching unit 35, the second switching unit 55, and the third switching unit 65 in response to input operations from the operator.

[0047] (Effects) In the above embodiment, the ship 1 has a pretreatment unit 30 which has a plurality of pretreatment devices 31 and a first switching unit 35, and a carbon dioxide recovery unit 40 which has a plurality of absorption unit bodies 51 and a second switching unit 55. Therefore, compared to the case in which only one pretreatment device 31 and one absorption unit body 51 are used, each of the plurality of pretreatment devices 31 and the plurality of absorption unit bodies 51 can be made smaller. In particular, the height of the tower-shaped pretreatment devices 31 and absorption unit bodies 51 can be reduced, and adverse effects on visibility and ship stability can be suppressed. As a result, the size of the equipment can be reduced. Furthermore, when the exhaust gas treatment system 20 treats the exhaust gas G1 from the combustion device 8, by appropriately selecting the number of pretreatment devices 31 into which the exhaust gas G1 is introduced and the number of absorption unit bodies 51 into which the treated gas G2 is introduced, according to the load of the combustion device 8, the energy required to operate the pretreatment devices 31 and absorption unit bodies 51 can be reduced. Furthermore, by providing multiple pretreatment devices 31 and multiple absorption unit bodies 51, it is possible to perform maintenance on some of the pretreatment devices 31 and absorption unit bodies 51 while continuing operation using the remaining pretreatment devices 31 and absorption unit bodies 51 during maintenance.

[0048] Further, in the above-described embodiment, the control unit 90 controls the first switching unit 35 and the second switching unit 55 according to the load of the combustion device 8, so that the number of pretreatment devices 31 for introducing the exhaust gas G1 and the number of absorption unit main bodies 51 for introducing the processing gas G2 can be appropriately selected, and the exhaust gas treatment system 20 can be efficiently operated.

[0049] Further, in the above-described embodiment, since the pretreatment unit 30 includes the first upstream header 32, the exhaust gas G1 from the combustion device 8 is equalized in pressure through the first upstream header 32 and then introduced into the plurality of pretreatment devices 31 through the plurality of first connection lines 36. By opening and closing the plurality of first on-off valves 36v, the number of pretreatment devices 31 into which the exhaust gas G1 is introduced from the first upstream header 32 through the first connection line 36 can be adjusted. Therefore, according to the load of the combustion device 8, the number of pretreatment devices 31 for introducing the exhaust gas G1 can be appropriately adjusted.

[0050] Further, in the above-described embodiment, since the carbon dioxide recovery unit 40 includes the second upstream header 52, the processing gas G2 from the pretreatment device 31 is equalized in pressure through the second upstream header 52 and then introduced into the plurality of absorption unit main bodies 51 through the plurality of second upstream connection lines 56. By opening and closing the plurality of second on-off valves 56v, the number of absorption unit main bodies 51 into which the processing gas G2 is introduced from the second upstream header 52 through the second upstream connection line 56 can be adjusted. Therefore, according to the load of the combustion device 8, the number of absorption unit main bodies 51 for introducing the processing gas G2 can be appropriately adjusted.

[0051] Further, in the above-described embodiment, since the carbon dioxide recovery unit 40 includes a plurality of regeneration devices 61, an increase in the size of the regeneration device 61 can be suppressed. Further, by selectively introducing the absorption liquid L that has absorbed carbon dioxide into at least one of the plurality of regeneration devices 61 by the third switching unit 65, the regeneration device 61 can be efficiently operated.

[0052] (Other Embodiments) Although embodiments of the present disclosure have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments and may include design changes, etc., that do not depart from the gist of the present disclosure. In the above embodiments, the pretreatment unit 30 is provided with multiple pretreatment devices 31, the carbon dioxide recovery unit 40 is provided with multiple absorption unit bodies 51, regeneration devices 61, liquefaction devices 71, and storage tanks 81. However, initially, one pretreatment device 31, one absorption unit body 51, one regeneration device 61, one liquefaction device 71, and one storage tank 81 may be provided, and then the number of each may be increased as needed. This allows for a suitable response when the processing capacity of the exhaust gas treatment system 20 is to be gradually increased, or when the pretreatment device 31, absorption unit body 51, regeneration device 61, liquefaction device 71, and storage tank 81 are to be replaced with new models.

[0053] Furthermore, in the above embodiment, the pretreatment unit 30's pretreatment device 31, the carbon dioxide recovery unit 40's absorption unit 50, and the regeneration unit 60 are equipped with a first on-off valve 36v, a second on-off valve 56v, and a third on-off valve 66v. However, the flow rate in the pretreatment device 31, the absorption unit body 51, and the regeneration device 61 may be controlled by adjusting the opening degrees of these first on-off valves 36v, 56v, and 66v.

[0054] Furthermore, in the above embodiment, the pretreatment unit 30 is provided with a plurality of pretreatment devices 31 for cooling the exhaust gas G1, but it is not limited to this. For example, other pretreatment devices may be provided before or after the plurality of pretreatment devices 31 to perform other pretreatment on the exhaust gas G1, such as removing soot and reducing the concentration of nitrogen oxides. In this case, the other pretreatment devices may also be a plurality of other pretreatment devices, similar to the above embodiment. In addition, depending on their size and other factors, only one pretreatment device may be provided.

[0055] Furthermore, although the above embodiment illustrates the configuration of the pretreatment device 31, a selective reduction catalyst (SCR) or the like may be used as the pretreatment device 31.

[0056] Figure 6 shows the configuration of a pretreatment unit of an exhaust gas treatment system according to a modified embodiment of the present disclosure. Furthermore, as shown in Figure 6, if, for example, a selective catalytic reduction (SCR) device is used as the pretreatment device 31B, the pretreatment unit 30B may include a chamber 91, a plurality of pretreatment devices 31B, and a first switching unit 35B.

[0057] The chamber 91 has an inlet 91a through which exhaust gas G1 flows in, and an outlet 91b through which processed gas G2 that has passed through the pretreatment device 31 flows out. The chamber 91 has a plurality of containment chambers 91s, each of which houses a plurality of pretreatment devices 31. The plurality of containment chambers 91s are formed by partitioning the inside of the chamber 91 with partition members 95 in directions intersecting the direction connecting the inlet 91a and the outlet 91b.

[0058] Multiple pre-processing devices 31 are provided in each of the multiple containment chambers 91s. In this embodiment, the multiple pre-processing devices 31B and the multiple containment chambers 91s are arranged in a direction intersecting the direction connecting the inlet 91a and the outlet 91b.

[0059] The first switching unit 35B includes an opening / closing unit 92 that connects multiple containment chambers 91s within the chamber 91 so that they can be opened and closed. In this embodiment, the opening / closing unit 92 is provided on a part of the partition member 95 so that it can be opened and closed on both the inlet 91a side and the outlet 91b side with respect to each pretreatment device 31. By opening the opening / closing unit 92, adjacent containment chambers 91s within the chamber 91 are connected, and the exhaust gas G1 that flows in from the inlet 91a flows out from the outlet 91b after passing through the multiple pretreatment devices 31B.

[0060] In this modified example, the pretreatment unit 30 includes a chamber 91 having a plurality of containment chambers 91s, each of which houses a plurality of pretreatment devices 31B, and the first switching unit 35 has an opening / closing unit 92. By opening and closing the opening / closing unit 92, the plurality of containment chambers 91s within the chamber 91 can be appropriately connected to each other. Therefore, the number of pretreatment devices 31B into which the exhaust gas G1 is introduced can be appropriately adjusted according to the load of the combustion device 8.

[0061] In the above embodiment, a tower-type scrubber was used as an example of the pretreatment device 31, but it is not limited to this. As the pretreatment device 31, a device of a different type from the tower type, such as a rotary packed bed (RPB), may also be used.

[0062] <Note> The vessel 1 described in the embodiment can be understood, for example, as follows.

[0063] (1) The vessel 1 according to the first embodiment comprises a hull 2, a combustion device 8 provided in the hull 2 ​​for burning fuel, and an exhaust gas treatment system 20 provided in the hull 2 ​​for treating exhaust gas G1 from the combustion device 8, wherein the exhaust gas treatment system 20 comprises a plurality of pretreatment devices 31 that pretreatment the exhaust gas G1 to generate a treated gas G2, and a first switching unit 35, 35B that can selectively introduce the exhaust gas G1 into at least one of the plurality of pretreatment devices 31, and a carbon dioxide recovery unit 40 that has a plurality of absorption unit bodies 51 that can recover carbon dioxide from the treated gas G2, and a second switching unit 55 that can selectively introduce the treated gas G2 into at least one of the plurality of absorption unit bodies 51.

[0064] Therefore, compared to the case where only one pretreatment device 31 and one absorption unit body 51 are used, each of the multiple pretreatment devices 31 and multiple absorption unit bodies 51 can be made smaller. As a result, if the pretreatment devices 31 and absorption unit bodies 51 are tower-shaped, their height can be reduced. Consequently, the overall size of the equipment can be kept down. Furthermore, when the exhaust gas treatment system 20 processes the exhaust gas G1 from the combustion device 8, by appropriately selecting the number of pretreatment devices 31 into which the exhaust gas G1 is introduced and the number of absorption unit bodies 51 into which the treated gas G2 is introduced, according to the load of the combustion device 8, the energy required to operate the pretreatment devices 31 and absorption unit bodies 51 can be reduced.

[0065] (2) The vessel 1 according to the second embodiment is the vessel 1 of (1), further comprising a control unit 90 that controls the first switching units 35, 35B and the second switching unit 55 in accordance with the load of the combustion device 8.

[0066] As a result, the control unit 90 controls the first switching unit 35 and the second switching unit 55 according to the load of the combustion device 8, thereby appropriately selecting the number of pretreatment devices 31 for introducing exhaust gas G1 and the number of absorption unit bodies 51 for introducing treated gas G2, and enabling efficient operation of the exhaust gas treatment system 20.

[0067] (3) The vessel 1 according to the third embodiment is the vessel 1 of (1) or (2), wherein the pretreatment unit 30 further comprises a first header 32 into which exhaust gas G1 from the combustion device 8 flows, and the first switching unit 35 comprises a plurality of first connection lines 36 connecting the first header 32 to each of the plurality of pretreatment devices 31, and a first on / off valve 36v for opening and closing each of the plurality of first connection lines 36.

[0068] As a result, exhaust gas G1 from the combustion device 8 is introduced to multiple pretreatment devices 31 via the first header 32 and multiple first connection lines 36. By opening and closing multiple first on-off valves 36v, the number of pretreatment devices 31 to which exhaust gas G1 is introduced from the first header 32 through the first connection lines 36 can be adjusted. Therefore, the number of pretreatment devices 31 to which exhaust gas G1 is introduced can be appropriately adjusted according to the load of the combustion device 8.

[0069] (4) The vessel 1 according to the fourth embodiment is any one of the vessels 1 of (1) to (3), wherein the carbon dioxide recovery unit 40 further comprises a second header 52 into which the processed gas G2 flows, and the second switching unit 55 comprises a plurality of second connection lines 56 connecting the second header 52 to each of the plurality of absorption unit bodies 51, and a second on-off valve 56v for opening and closing each of the plurality of second connection lines 56.

[0070] As a result, the processed gas G2 from the pretreatment device 31 is introduced to multiple absorption unit bodies 51 through the second header 52 and multiple second connection lines 56. By opening and closing multiple second on-off valves 56v, the number of absorption unit bodies 51 to which the processed gas G2 is introduced from the second header 52 through the second connection lines 56 can be adjusted. Therefore, the number of absorption unit bodies 51 to which the processed gas G2 is introduced can be appropriately adjusted according to the load of the combustion device 8.

[0071] (5) The vessel 1 according to the fifth embodiment is any one of the vessels 1 of (1), (2), and (4), wherein the pretreatment unit 30B further comprises a chamber 91 having an inlet 91a into which the exhaust gas G1 flows, a plurality of containment chambers 91s each containing a plurality of pretreatment devices 31B, and an outlet 91b from which the treatment gas G2 flows out, and the first switching unit 35B has an opening / closing unit 92 that opens and closes the plurality of containment chambers 91s within the chamber 91.

[0072] This allows the multiple containment chambers 91s within the chamber 91 to be connected to each other as appropriate by opening and closing the opening / closing section 92. Therefore, the number of pretreatment devices 31B into which exhaust gas G1 is introduced can be appropriately adjusted according to the load of the combustion device 8.

[0073] (6) The vessel 1 according to the sixth embodiment is any one of the vessels 1 of (1) to (5), wherein the absorption unit body 51 absorbs carbon dioxide from the processing gas G2 using an absorbent liquid L, and the carbon dioxide recovery unit 40 further comprises a plurality of regeneration devices 61 for regenerating the absorbent liquid L that has absorbed the carbon dioxide, and a third switching unit 65 that can selectively introduce the absorbent liquid L that has absorbed the carbon dioxide into at least one of the plurality of regeneration devices 61.

[0074] This helps to keep the size of the regeneration device 61 down. In addition, the third switching unit 65 selectively introduces the absorbent liquid L that has absorbed carbon dioxide into at least one of the multiple regeneration devices 61, allowing the regeneration devices 61 to be operated efficiently.

[0075] According to the vessel described in this disclosure, it is possible to keep the size of the equipment down.

[0076] 1. Vessel 2. Hull 3A, 3B. Sides 4. Bottom 5. Upper deck 6. Superstructure 8. Combustion device 20. Exhaust gas treatment system 30, 30B. Pretreatment unit 31, 31B. Pretreatment device 31a. Tower body 31b. Treatment liquid spraying section 31c. Circulation line 31p. Pump 32. First upstream header (first header) 33. First downstream header 35, 35B. First switching section 36. First connection line 36v. First on-off valve 37. First downstream connection line 37v. On-off valve 40. Carbon dioxide recovery unit 50. Absorption section 51. Absorption section body 51a. Tower body 51b. Absorption liquid spraying section 51c. Circulation line 51p. Pump 52. Second upstream header (second header) 53. Second downstream header 55. Second switching section 56. Second upstream connection line (second connection line) 56v Second shut-off valve 57 Second downstream connection line 57v Shut-off valve 60 Regeneration unit 61 Regeneration device 61a Tower body 62 Third upstream header 63 Third downstream header 65 Third switching unit 66 Third upstream connection line 66v Third shut-off valve 67 Third downstream connection line 67v Shut-off valve 70 Liquefaction unit 71 Liquefaction device 80 Storage unit 81 Storage tank 90 Control unit 91 Chamber 91a Inlet 91b Outlet 91s Storage chamber 92 Shut-off unit 95 Partition member 101 Exhaust gas line 102-104, 106 Connection line 104s Branch line 104v Shut-off valve 105 Exhaust line 106s Branch line 106v Shut-off valve G1 Exhaust gas G2, G3 Processed gas Gc Gaseous carbon dioxide L Absorbent solution

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