Ship

Abstract

This ship is provided with: a hull; the combustion device is arranged on the ship body and is used for combusting fuel; a carbon dioxide recovery unit which is provided on the hull and which recovers carbon dioxide in the exhaust gas from the exhaust gas of the combustion device; and an air blowing unit for blowing the exhaust gas of the combustion device into the carbon dioxide recovery unit, the air blowing unit being provided with: a blower for blowing the exhaust gas of the combustion device toward the carbon dioxide recovery unit; and a flow rate adjustment unit which is provided on the inlet side of the blower and adjusts the flow rate of the exhaust gas fed into the carbon dioxide recovery unit by the blower by changing the opening degree.

Description

Technical Field

[0001] The present invention relates to a ship.

[0002] This application claims priority based on Japanese Patent Application No. 2022-206692 filed on December 23, 2022, and incorporates its content herein. Background Art

[0003] Patent Document 1 discloses a recovery device that includes a separation device for separating carbon dioxide from exhaust gas that has burned fuel (natural gas).

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2017-176954 Summary of the Invention

[0007] Technical Problem to be Solved by the Invention

[0008] In land-based facilities such as power plants, the amount of exhaust gas generated by burning fuel does not change significantly. Therefore, in the recovery device of Patent Document 1 described above, for example, pumps for transporting liquids such as absorption liquid for separating carbon dioxide from exhaust gas and water for cooling in a separation device, etc., generally operate at a substantially constant rotational speed.

[0009] In contrast, in combustion devices such as the main engine and generator of a ship, the load varies significantly depending on the operating conditions of the ship, the weather, etc. At this time, the amount of exhaust gas generated in the combustion device also varies significantly depending on the situation. On the other hand, the recovery device operates based on the maximum amount of assumed exhaust gas in the combustion device. Therefore, for example, in a state where the load of the combustion device is small, the energy required to operate the recovery device may be wasted.

[0010] The present invention has been completed to solve the above problems, and an object thereof is to provide a ship capable of efficiently recovering carbon dioxide according to the operating load of a combustion device.

[0011] Means for Solving the Technical Problem

[0012] In order to solve the above problems, the ship according to the present invention includes a hull, a combustion device, a carbon dioxide recovery unit, and a blowing unit. The combustion device is provided on the hull and burns fuel. The carbon dioxide recovery unit is provided on the hull. The carbon dioxide recovery unit recovers carbon dioxide in the exhaust gas from the exhaust gas of the combustion device. The blowing unit sends the exhaust gas of the combustion device into the carbon dioxide recovery unit. The blowing unit includes a blower and a flow rate adjustment unit. The blower blows the exhaust gas of the combustion device toward the carbon dioxide recovery unit. The flow rate adjustment unit is provided on the inlet side of the blower. The flow rate adjustment unit adjusts the flow rate of the exhaust gas sent into the carbon dioxide recovery unit by the blower by changing the opening degree.

[0013] Advantages of the Invention

[0014] The ship according to the present invention can provide a ship capable of efficiently recovering carbon dioxide according to the operating load of the combustion device. Description of the Drawings

[0015] Figure 1 is a side view of the ship according to the embodiment of the present invention.

[0016] Figure 2 is a diagram showing the structure of the carbon dioxide recovery unit of the ship according to the embodiment of the present invention.

[0017] Figure 3 is a diagram showing the structure of the flow rate adjustment unit of the ship according to the embodiment of the present invention.

[0018] Figure 4 is a diagram showing the hardware structure of the control device of the ship according to the embodiment of the present invention.

[0019] Figure 5 is a functional block diagram of the control device according to the embodiment of the present invention. Detailed Embodiments

[0020] Hereinafter, a ship according to an embodiment of the present invention will be described with reference to Figures 1 to 5 a ship according to an embodiment of the present invention will be described.

[0021] (Structure of the Ship)

[0022] As Figure 1 shown, the ship 1 according to the embodiment of the present invention includes at least a hull 2, a superstructure 4, a combustion device 8, and a carbon dioxide recovery unit 10. In addition, the type of the ship 1 in this embodiment is not limited to a specific type of ship. Examples of the type of the ship 1 include a liquefied gas carrier, a ferry, a RORO ship, an automobile carrier, a passenger ship, and the like.

[0023] The hull 2 has a pair of side hulls 5A and 5B that form its outer shell and a bottom hull 6. The side hulls 5A and 5B each have a pair of side outer plates that form the starboard and port sides respectively. The bottom hull 6 has a bottom outer plate that connects these side hulls 5A and 5B. Through these pair of side hulls 5A and 5B and the bottom hull 6, the outer shell of the hull 2 is U-shaped in a cross-section perpendicular to the ship's bow and stern direction FA.

[0024] The hull 2 also has a full-length deck, i.e., the upper deck 7, disposed on the uppermost layer. The superstructure 4 is formed on this upper deck 7. Living quarters and the like are provided within the superstructure 4. In the ship 1 of this embodiment, for example, a cargo space (not shown) for loading cargo is provided on the bow 2a side of the ship in the ship's bow and stern direction FA further forward than the superstructure 4.

[0025] The combustion device 8 is a device that generates heat energy by burning fuel, and it is provided within the above-mentioned hull 2. As the combustion device 8, examples include internal combustion engines used in main engines for propelling the ship 1, internal combustion engines used in power generation equipment for supplying power to the ship's interior, boilers that generate steam as a working fluid, and the like.

[0026] (Structure of the carbon dioxide recovery section)

[0027] The carbon dioxide recovery section 10 recovers carbon dioxide from the exhaust gas of the combustion device 8. The carbon dioxide recovery section 10 is provided on the hull 2. In this embodiment, the carbon dioxide recovery section 10 exemplified is provided on the upper deck 7 of the hull 2, but the arrangement of the carbon dioxide recovery section 10 is not limited to the upper deck 7.

[0028] Figure 2 It is a diagram showing the structure of the carbon dioxide recovery section according to the embodiment of the present invention.

[0029] As Figure 2 shown, the carbon dioxide recovery section 10 includes an exhaust gas cooling tower 11, an absorption tower 12, a regeneration tower 13, an exhaust gas scrubbing tower 14, a recovery section 15, a blower section 20, and a control device 60.

[0030] The exhaust gas cooling tower 11 cools the exhaust gas of the combustion device 8 (refer to Figure 1 ) (for example, cools it to about 40°C) using water floating around the hull 2 or fresh water stored in a fresh water tank (not shown) provided within the hull 2 as a coolant. Additionally, the exhaust gas cooling tower 11 can be provided as needed. For example, it can be omitted if the temperature of the exhaust gas introduced into the absorption tower 12 is sufficiently reduced.

[0031] An exhaust gas inlet pipe 101 for conveying the exhaust gas of the combustion device 8 is connected to the lower part of the exhaust gas cooling tower 11. The exhaust gas cooling tower 11 has a tower main body 11a and a nozzle (not shown) for spraying the coolant from the upper part within the tower main body 11a.

[0032] A coolant supply system 102 for circulating coolant is connected to the exhaust gas cooling tower 11. One end of the coolant supply system 102 is connected to the bottom of the tower main body 11a. The other end of the coolant supply system 102 is connected to a nozzle (not shown) at the upper part of the tower main body 11a.

[0033] A coolant supply pump 31 and a heat exchanger 41 are provided midway in the coolant supply system 102. The coolant supply pump 31 sucks the coolant staying at the bottom of the tower main body 11a from inside the tower main body 11a and supplies it to the nozzle at the upper part of the tower main body 11a. The coolant supplied to the nozzle is sprayed into the tower main body 11a from the nozzle and contacts the exhaust gas fed into the tower main body 11a. Thus, the exhaust gas is cooled, and dust such as coal dust contained in the exhaust gas is captured and washed away by the coolant.

[0034] The heat exchanger 41 exchanges heat between the cooling water supplied from the outside of the carbon dioxide recovery section 10 and the coolant flowing in the coolant supply system 102. In other words, the heat exchanger 41 cools the coolant flowing in the coolant supply system 102 with the cooling water supplied from the outside of the carbon dioxide recovery section 10.

[0035] One end of an exhaust gas discharge pipe 103 is connected to the top of the tower main body 11a. The exhaust gas discharge pipe 103 sends the exhaust gas cooled by the coolant and washed with dust such as coal dust in the tower main body 11a into the absorption tower 12.

[0036] The absorption tower 12 absorbs the carbon dioxide contained in the exhaust gas with an absorption liquid. The absorption tower 12 includes a tower main body 12a and a nozzle (not shown) for spraying the absorption liquid from the upper part inside the tower main body 12a. The other end of the exhaust gas discharge pipe 103 is connected to the lower part of the tower main body 12a. The exhaust gas passing through the exhaust gas discharge pipe 103 and passing through the exhaust gas cooling tower 11 is fed into the tower main body 12a.

[0037] The absorption liquid is supplied from the regeneration tower 13 via a circulation system 106 described later. The absorption tower 12, for example, makes the absorption liquid drip from the nozzle inside the tower main body 12a and makes it contact the exhaust gas introduced into the absorption tower 12, so that the carbon dioxide contained in the exhaust gas is absorbed by the absorption liquid. The absorption tower 12, for example, absorbs the carbon dioxide contained in the exhaust gas by a chemical absorption method. In this embodiment, MEA (monoethanolamine) is used as the absorption liquid for absorbing carbon dioxide by the chemical absorption method. As the absorption liquid, an absorption liquid other than MEA can also be used.

[0038] The exhaust gas after the carbon dioxide is absorbed by the absorption liquid is introduced into the exhaust gas scrubbing tower 14 from the top of the tower main body 12a through the gas discharge pipe 104. The exhaust gas scrubbing tower 14 drips the scrubbing liquid from the upper part inside the exhaust gas scrubbing tower 14, thereby flushing the absorption liquid contained in the exhaust gas discharged from the absorption tower 12. As the scrubbing liquid in this embodiment, for example, water floating around the hull 2 or fresh water stored in a fresh water tank (not shown) provided inside the hull 2 is used. The exhaust gas scrubbing tower 14 includes a tower main body 14a and a nozzle (not shown) that sprays the scrubbing liquid from the upper part inside the tower main body 14a.

[0039] A scrubbing liquid supply system 105 for circulating the scrubbing liquid is connected to the exhaust gas scrubbing tower 14. One end of the scrubbing liquid supply system 105 is connected to the bottom of the tower main body 14a. The other end of the scrubbing liquid supply system 105 is connected to a nozzle (not shown) inside the tower main body 14a at the upper part of the tower main body 14a. A scrubbing liquid supply pump 33 and a heat exchanger 43 are provided in the middle of the scrubbing liquid supply system 105.

[0040] The scrubbing liquid supply pump 33 sucks the scrubbing liquid inside the tower main body 14a from the bottom of the tower main body 14a and supplies it to the nozzle at the upper part of the tower main body 14a. The scrubbing liquid supplied to the nozzle is sprayed into the inside of the tower main body 14a from the nozzle and comes into contact with the exhaust gas sent into the tower main body 14a. Thereby, the absorption liquid contained in the exhaust gas is captured and flushed by the scrubbing liquid.

[0041] The heat exchanger 43 exchanges heat between the cooling water supplied from the outside of the carbon dioxide recovery unit 10 and the scrubbing liquid flowing in the scrubbing liquid supply system 105. In other words, the heat exchanger 43 cools the scrubbing liquid circulating in the scrubbing liquid supply system 105 with the cooling water supplied from the outside of the carbon dioxide recovery unit 10. Then, the scrubbing liquid cooled by the heat exchanger 43 is sprayed into the inside of the tower main body 14a from the nozzle at the upper part of the tower main body 14a.

[0042] One end of an exhaust pipe 107 is connected to the top of the tower main body 14a. The exhaust pipe 107 guides the exhaust gas discharged from the exhaust gas scrubbing tower 14, that is, the exhaust gas from which the absorption liquid has been removed by the exhaust gas scrubbing tower 14, for example, to an exhaust chimney (not shown) provided on the ship 1 and releases it into the atmosphere.

[0043] A circulation system 106 for circulating the absorption liquid is provided between the absorption tower 12 and a regeneration tower 13 described later. The circulation system 106 includes an absorption liquid supply system 106A, an absorption liquid discharge system 106B, and a heat exchanger 106C.

[0044] One end of the absorption liquid supply system 106A is connected to the bottom of the tower main body 13a of the regeneration tower 13. The other end of the absorption liquid supply system 106A is connected to a nozzle (not shown) inside the tower main body 12a of the absorption tower 12 at the upper part of the tower main body 12a. A first circulation pump 32A is provided in the middle of the absorption liquid supply system 106A. The first circulation pump 32A sucks the absorption liquid from the bottom of the tower main body 13a of the regeneration tower 13 through the absorption liquid supply system 106A and supplies it to the nozzle at the upper part of the tower main body 12a of the absorption tower 12.

[0045] One end of the absorption liquid discharge system 106B is connected to the bottom of the tower main body 12a of the absorption tower 12. The other end of the absorption liquid discharge system 106B is connected to a nozzle (not shown) provided inside the tower main body 13a of the regeneration tower 13 at the upper part of the tower main body 13a. A second circulation pump 32B is provided in the middle of the absorption liquid discharge system 106B. The second circulation pump 32B sucks the absorption liquid from the bottom of the tower main body 12a of the absorption tower 12 through the absorption liquid discharge system 106B and supplies it to the nozzle at the upper part of the tower main body 13a of the regeneration tower 13.

[0046] The heat exchanger 106C performs heat exchange between the absorption liquid flowing in the absorption liquid supply system 106A and the absorption liquid flowing in the absorption liquid discharge system 106B. In other words, the heat of the absorption liquid just after separating carbon dioxide by the regeneration tower 13 is used to heat the absorption liquid that has absorbed carbon dioxide before being introduced into the regeneration tower 13. In addition, the heat exchanger 106C can be omitted.

[0047] The regeneration tower 13 separates gaseous carbon dioxide from the absorption liquid that has absorbed carbon dioxide in the absorption tower 12. More specifically, the regeneration tower 13 heats the absorption liquid sent from the absorption tower 12 to the inside of the regeneration tower 13 via the absorption liquid discharge system 106B by the absorption liquid heating system 108.

[0048] The absorption liquid heating system 108 is connected to the regeneration tower 13. The absorption liquid heating system 108 circulates the absorption liquid between the regeneration tower 13 and the reboiler 18. That is, the absorption liquid heating system 108 supplies the absorption liquid taken out from the inside of the regeneration tower 13 to the reboiler 18 and returns the absorption liquid from the reboiler 18 to the inside of the regeneration tower 13. Further, the reboiler 18 is provided in the middle of the absorption liquid heating system 108. A steam supply pipe 81 is connected to the reboiler 18, and steam generated in a boiler (not shown) etc. inside the hull 2 is sent into the reboiler 18 through the steam supply pipe 81. The reboiler 18 performs heat exchange between the steam sent through the steam supply pipe 81 and the absorption liquid flowing in the absorption liquid heating system 108. That is, the reboiler 18 heats the absorption liquid with the heat of the steam.

[0049] Gaseous carbon dioxide is separated from the absorbent solution heated by the reboiler 18. Then, these absorbent solution and gaseous carbon dioxide are returned into the tower main body 13a. The absorbent solution regenerated by the separation of gaseous carbon dioxide is returned to the absorption tower 12 through the absorbent solution supply system 106A and reused. On the other hand, the separated gaseous carbon dioxide is sent to the recovery section 15 through the gaseous carbon dioxide discharge pipeline 109. A condenser 19 is provided midway in the gaseous carbon dioxide discharge pipeline 109. The condenser 19 condenses the moisture contained in the gaseous carbon dioxide through heat exchange with the cooling water supplied from the outside of the carbon dioxide recovery section 10.

[0050] The recovery section 15 recovers the gaseous carbon dioxide separated in the regeneration tower 13. The recovery section 15 is equipped with a regeneration reflux tower 16. The regeneration reflux tower 16 separates the gaseous carbon dioxide fed through the condenser 19 and the condensed water with condensed moisture into gas and liquid.

[0051] The condensed water after gas-liquid separation flows back to the regeneration tower 13 from the bottom of the regeneration reflux tower 16 through the reflux pipeline 110. A reflux pump 112 for returning the condensed water to the regeneration tower 13 is provided midway in the reflux pipeline 110. On the other hand, the gaseous carbon dioxide from which the moisture has been removed by the regeneration reflux tower 16 is discharged to the outside of the carbon dioxide recovery section 10 through the carbon dioxide discharge pipeline 111. The gaseous carbon dioxide discharged through the carbon dioxide discharge pipeline 111 is stored, for example, in a carbon dioxide recovery tank (not shown) provided in the hull 2. At this time, the gaseous carbon dioxide can be liquefied by an appropriate carbon dioxide liquefaction device and stored in the carbon dioxide recovery tank.

[0052] In the carbon dioxide recovery section 10 as described above, the exhaust gas discharged from the combustion device 8 is cooled and washed in the exhaust gas cooling tower 11 and then introduced into the absorption tower 12. In the absorption tower 12, the carbon dioxide contained in the exhaust gas is absorbed by the absorbent solution. The exhaust gas from which carbon dioxide has been separated by being absorbed by the absorbent solution is washed in the exhaust gas cleaning tower 14 and then released into the atmosphere. And, in the absorption tower 12, the absorbent solution that has absorbed the carbon dioxide contained in the exhaust gas is sent to the regeneration tower 13 through the circulation system 106. The absorbent solution that has absorbed carbon dioxide is heated by the reboiler 18 and its temperature rises, thereby separating the gaseous carbon dioxide contained in the absorbent solution. The separated gaseous carbon dioxide is recovered through the regeneration reflux tower 16. On the other hand, the absorbent solution from which carbon dioxide has been separated in the regeneration tower 13 circulates to the absorption tower 12 through the circulation system 106.

[0053] (Structure of the air supply section)

[0054] In the middle of the exhaust gas introduction pipe 101, a blower section 20 is provided. The blower section 20 sends the exhaust gas of the combustion device 8 into the carbon dioxide recovery section 10. In the present embodiment, an example is shown in which the blower section 20 sends the exhaust gas in the exhaust gas introduction pipe 101 into the exhaust gas cooling tower 11. In addition, the blower section 20 may be provided in the middle of the exhaust gas discharge pipe 103 between the exhaust gas cooling tower 11 and the absorption tower 12, or may be provided in both the middle of the exhaust gas introduction pipe 101 and the middle of the exhaust gas discharge pipe 103.

[0055] The blower section 20 includes a blower 21 and a flow rate adjustment section 22. The blower 21 blows the exhaust gas of the combustion device 8 through the exhaust gas introduction pipe 101 toward the carbon dioxide recovery section 10. The flow rate adjustment section 22 is provided on the inlet side of the blower 21. The flow rate adjustment section 22 is configured to be able to adjust the flow rate of the exhaust gas flowing into the inlet of the blower 21 by changing its opening degree. In other words, the flow rate adjustment section 22 can adjust the flow rate of the exhaust gas sent into the carbon dioxide recovery section 10 by the blower 21.

[0056] Figure 3 It is a diagram showing the structure of the flow rate adjustment section of the ship according to the embodiment of the present invention.

[0057] As Figure 3 shown, the flow rate adjustment section 22 of the present embodiment is a so-called inlet guide vane (IGV: Inlet Guide Vane), and includes a plurality of movable vanes 24. These plurality of movable vanes 24 are provided between the central hub 25 and the support 26. The central hub 25 extends along the axis O, and the axis O extends along the extending direction of the exhaust gas introduction pipe 101. The support 26 is provided on the outer side Dro in the radial direction Dr centered on the axis O with respect to the central hub 25. The support 26 is annular when viewed from the direction of the axis O. The support 26 can be set to be continuous with the inlet of the blower 21, for example.

[0058] The plurality of movable vanes 24 are arranged on the inner side Dri in the radial direction Dr with respect to the support 26. These plurality of movable vanes 24 are arranged at equal intervals in the circumferential direction Dc centered on the axis O. Each movable vane 24 is supported by the central hub 25 and the support 26 via shaft portions 24s, 24t extending in the radial direction Dr, and can rotate around the shaft portions 24s, 24t. These plurality of movable vanes 24 are rotationally driven around the shaft portions 24s, 24t by a vane drive source (not shown) such as a motor. The flow rate adjustment section 22 adjusts the opening degree of the exhaust gas flow path 22r on the inner side in the radial direction Dr with respect to the support 26 by rotating the plurality of movable vanes 24 around the shaft portions 24s, 24t.

[0059] The control device 60 controls the operation of the flow rate adjustment unit 22 according to the flow rate of the exhaust gas of the combustion device 8. The control device 60 adjusts the opening degree of the plurality of movable vanes 24 of the flow rate adjustment unit 22 according to the flow rate of the exhaust gas of the combustion device 8. That is, if the flow rate of the exhaust gas of the combustion device 8 is large, the control device 60 increases the opening degree of the flow rate adjustment unit 22, and if the flow rate of the exhaust gas of the combustion device 8 is small, the control device 60 decreases the opening degree of the flow rate adjustment unit 22.

[0060] (Hardware structure diagram)

[0061] Figure 4 It is a diagram showing the hardware structure of the control device of the carbon dioxide recovery unit according to the embodiment of the present invention.

[0062] As Figure 4 shown, the control device 60 is a computer including a CPU 61 (Central Processing Unit), a ROM 62 (Read Only Memory), a RAM 63 (Random Access Memory), a storage device 64, and a signal transceiver module 65. The signal transceiver module 65 receives a signal related to the flow rate of the exhaust gas of the combustion device 8.

[0063] (Functional block diagram)

[0064] Figure 5 It is a functional block diagram of the control device according to the embodiment of the present invention.

[0065] As Figure 5 shown, the CPU 61 of the control device 60 realizes the respective structures of the signal input unit 70, the information acquisition unit 71, the exhaust gas flow rate control unit 72, the pump output control unit 73, and the output unit 75 by executing a program pre-stored in a storage device such as the ROM 62 or the storage device 64.

[0066] The signal input unit 70 receives a signal related to the flow rate of the exhaust gas of the combustion device 8 via the hardware, that is, the signal transceiver module 65. As a signal related to the flow rate of the exhaust gas of the combustion device 8, for example, a signal indicating the load of the combustion device 8, a signal indicating the flow rate of the fuel supplied to the combustion device 8 can be exemplified. And, when the combustion device 8 is equipped with a supercharger (not shown), as a signal related to the flow rate of the exhaust gas of the combustion device 8, a signal indicating the rotational speed of the supercharger can be exemplified. In addition, in large ships, usually the diameter of the piping through which the exhaust gas flows is very large, so it is difficult to directly measure the flow rate of the exhaust gas using a flow meter or the like.

[0067] The information acquisition unit 71 acquires information related to the flow rate of the exhaust gas of the combustion device 8 based on the signal received in the signal input unit 70. Specifically, the information acquisition unit 71 of this embodiment acquires information related to the flow rate of the exhaust gas of the combustion device 8, for example, information indicating the ratio of the flow rate of the exhaust gas of the combustion device 8 at that moment relative to the assumed maximum flow rate of the exhaust gas.

[0068] The exhaust gas flow control unit 72 rotates the plurality of movable blades 24 based on information related to the flow rate of the exhaust gas from the burner 8 to control the opening of the flow rate adjustment unit 22. The exhaust gas flow control unit 72 controls the plurality of movable blades 24 based on the flow rate of the exhaust gas from the burner 8 to increase or decrease the opening of the flow rate adjustment unit 22. When the exhaust gas flow control unit 72 controls the plurality of movable blades 24 based on the flow rate of the exhaust gas from the burner 8 to increase or decrease the opening of the flow rate adjustment unit 22, the opening of the flow rate adjustment unit 22 may be adjusted to a plurality of stages based on table information, graph information, etc. that are pre-set in association with the flow rate of the exhaust gas from the burner 8.

[0069] In addition to the control of the exhaust gas flow rate, a flow rate control function for various pumps of the carbon dioxide recovery device can be added as follows.

[0070] The pump output control unit 73 controls the outputs of the coolant supply pump 31, the first circulation pump 32A, the second circulation pump 32B, and the cleaning liquid supply pump 33 according to the information related to the flow rate of the exhaust gas of the combustion device 8. The pump output control unit 73 controls the outputs of the coolant supply pump 31, the first circulation pump 32A, the second circulation pump 32B, the cleaning liquid supply pump 33, and the return pump 112 in conjunction with the opening of the flow adjustment unit 22. The coolant supply pump 31, the first circulation pump 32A, the second circulation pump 32B, the cleaning liquid supply pump 33, and the return pump 112 illustrated in this embodiment are electric pumps. The pump output control unit 73 controls the speed of the motor (not shown) driving the coolant supply pump 31, the first circulation pump 32A, the second circulation pump 32B, the cleaning liquid supply pump 33, and the return pump 112 through inverter control, thereby controlling the outputs of each. As information related to the flow rate of the exhaust gas, the carbon dioxide concentration or the temperature and pressure of various fluids that change according to the flow rate are also included.

[0071] The pump output control unit 73 of the present embodiment performs so-called inverter control, that is, controls the rotational speeds of the motors of the coolant supply pump 31, the first circulation pump 32A, the second circulation pump 32B, the cleaning liquid supply pump 33, and the reflux pump 112 by increasing or decreasing the current supplied to each motor through an inverter (not shown). As a control method of this inverter, PWM (Pulse Width Modulation) control or the like can be exemplified. Then, as a method of adjusting the outputs of the coolant supply pump 31, the first circulation pump 32A, the second circulation pump 32B, the cleaning liquid supply pump 33, and the reflux pump 112 according to the opening degree of the flow rate adjustment unit 22, for example, a method of linearly or stepwise adjusting according to the opening degree of the flow rate adjustment unit 22 can be cited. In addition, in the pump output control unit 73, when controlling the outputs of the coolant supply pump 31, the first circulation pump 32A, the second circulation pump 32B, the cleaning liquid supply pump 33, and the reflux pump 112 according to the opening degree of the flow rate adjustment unit 22, it can be adjusted according to table information, graph information, etc. of the opening degree of the flow rate adjustment unit 22 and the outputs of the above-mentioned respective pumps pre-made based on simulation or experiment, etc.

[0072] The output unit 75 outputs a control signal for changing the opening degrees of the plurality of movable vanes 24 of the flow rate adjustment unit 22 according to the control of the exhaust gas flow rate control unit 72. Specifically, the output unit 75 outputs a control signal for changing the outputs of the coolant supply pump 31, the first circulation pump 32A, the second circulation pump 32B, the cleaning liquid supply pump 33, and the reflux pump 112 according to the control of the pump output control unit 73.

[0073] (Function and effect)

[0074] In the ship 1 of the above embodiment, the exhaust gas of the combustion device 8 is blown to the carbon dioxide recovery unit 10 by the air supply unit 20. Since the air supply unit 20 is provided with a flow rate adjustment unit 22 capable of changing the opening degree on the inlet side of the blower 21, the flow rate of the exhaust gas sent into the carbon dioxide recovery unit 10 can be adjusted by changing the opening degree of the flow rate adjustment unit 22. Therefore, the opening degree of the flow rate adjustment unit 22 can be changed according to the flow rate of the exhaust gas of the combustion device 8, so that the flow rate of the exhaust gas sent into the carbon dioxide recovery unit 10 can be appropriately adjusted.

[0075] In addition, as described above, a function of adjusting the outputs of the coolant supply pump 31, the first circulation pump 32A, the second circulation pump 32B, the cleaning liquid supply pump 33, and the reflux pump 112 according to the amount of the exhaust gas sent into the carbon dioxide recovery unit 10 can be added. If this function is added, there is no need to continue operating for the exhaust gas with excessive flow rate in the carbon dioxide recovery unit 10, and energy consumption can also be suppressed. Therefore, the carbon dioxide recovery unit 10 can be operated efficiently.

[0076] Moreover, in the above-described embodiment, the flow rate adjustment unit 22 changes the opening degree by rotating the plurality of movable vanes 24 around the shaft portions 24s and 24t, and adjusts the flow rate of the exhaust gas sent from the blower 21 to the carbon dioxide recovery unit 10. Therefore, it is possible to improve the followability or control accuracy when adjusting the flow rate change of the exhaust gas sent from the blower 21 to the carbon dioxide recovery unit 10, and it is possible to reduce the pressure loss caused by the flow rate adjustment unit 22.

[0077] Furthermore, in the above-described embodiment, the control device 60 controls the operation of the flow rate adjustment unit 22 according to the flow rate of the exhaust gas of the combustion device 8. Therefore, it is possible to operate automatically and to operate the carbon dioxide recovery unit 10 efficiently.

[0078] Moreover, in the above-described embodiment, based on the information related to the load of the combustion device 8 acquired by the information acquisition unit 71, the operation of the flow rate adjustment unit 22 is controlled to adjust the flow rate of the exhaust gas sent from the blower 21 to the carbon dioxide recovery unit 10. Therefore, even when it is impossible to directly measure the flow rate of the exhaust gas as in the case of the large ship 1, it is possible to control the flow rate adjustment unit 22 so as to have an opening degree corresponding to the flow rate of the exhaust gas, and thus the carbon dioxide recovery unit 10 including the absorption tower 12, the regeneration tower 13, and the recovery unit 15 can be operated efficiently.

[0079] (Modification of the embodiment)

[0080] In the above-described embodiment, the exhaust gas flow rate control unit 72 of the control device 60 adjusts the flow rate of the exhaust gas sent to the carbon dioxide recovery unit 10 based on the information related to the flow rate of the exhaust gas of the combustion device 8 through the flow rate adjustment unit 22, but the structure is not limited to this.

[0081] For example, it can be configured such that the control device 60 adjusts the flow rate of the exhaust gas sent to the carbon dioxide recovery unit 10 not only based on the information related to the flow rate of the exhaust gas but also based on the required value of the carbon dioxide recovery capacity in the carbon dioxide recovery unit 10. Here, the required value of the carbon dioxide recovery capacity in the carbon dioxide recovery unit 10 is, for example, the required value of the ratio of carbon dioxide recovered from the exhaust gas through the carbon dioxide recovery unit 10.

[0082] As a countermeasure for reducing greenhouse gases (GHGs), in the International Maritime Organization (IMO), the Carbon Intensity Index (CII) has been established as a classification of the actual fuel consumption rate in ships. In this CII, the classification (grade) of the actual fuel consumption rate is set in multiple stages based on the amount of carbon dioxide emissions per unit transport capacity. The classification of the actual fuel consumption rate is set to become gradually stricter as the specified period elapses.

[0083] The required value of the carbon dioxide recovery capacity described above can be set according to the classification of the actual fuel consumption rate. At this time, the control device 60 only needs to set the required value of the carbon dioxide recovery capacity in the carbon dioxide recovery unit 10 according to the classification of the target actual fuel consumption rate at that moment. And, for example, when the classification (grade) of the actual fuel consumption rate is continuously maintained, the required value of the carbon dioxide recovery capacity can be set in such a way that the carbon dioxide discharge amount gradually decreases every time a predetermined period elapses.

[0084] In this structure, the flow rate of the exhaust gas sent into the carbon dioxide recovery unit 10 by the air supply unit 20 can be adjusted according to the required value of the carbon dioxide recovery capacity in the carbon dioxide recovery unit 10. Therefore, it is possible to suppress operation in a state where the carbon dioxide recovery capacity in the carbon dioxide recovery unit 10 is excessive, and it is possible to further suppress energy consumption.

[0085] (Other embodiments)

[0086] As described above, the embodiments of the present invention have been described in detail with reference to the accompanying drawings. However, the specific structure is not limited to this embodiment, and also includes design changes and the like within the scope not departing from the gist of the present invention.

[0087] In the above embodiment, the flow rate of the exhaust gas sent into the carbon dioxide recovery unit 10 by the blower 21 is adjusted by adjusting the opening degree of the flow rate adjustment unit 22, but it is not limited thereto.

[0088] For example, it can be set that in addition to performing the flow rate adjustment based on the above flow rate adjustment unit 22, the flow rate adjustment based on the blower 21 is also performed.

[0089] At this time, the exhaust gas flow rate control unit 72 only needs to control the rotational speed of the motor (not shown) that drives the blower 21 by inverter control. As a control method of the blower 21 based on the exhaust gas flow rate control unit 72, similar to each pump in the above carbon dioxide recovery unit 10, inverter control can be exemplified. In this way, when the followability to the change in the exhaust gas flow rate is ensured by the flow rate adjustment unit 22 and the exhaust gas flow rate decreases, the rotational speed of the blower 21 can be decreased according to the decrease in the exhaust gas flow rate, thereby reducing energy consumption.

[0090] Moreover, in the above-described embodiment, the flow rate adjustment unit 22 is configured to include a plurality of movable vanes 24, but the flow rate adjustment unit 22 is not limited to this configuration. The flow rate adjustment unit 22 may be any structure that can adjust the flow rate of the exhaust gas sent to the carbon dioxide recovery unit 10. For example, other flow rate adjustment valves such as butterfly valves can be used. At this time, although the followability or control accuracy is reduced compared to the structure with a plurality of movable vanes 24, similarly to the structure with a plurality of movable vanes 24, the opening degree of the flow rate adjustment unit 22 can be changed according to the flow rate of the exhaust gas of the combustion device 8, so that the flow rate of the exhaust gas sent to the carbon dioxide recovery unit 10 can be appropriately adjusted.

[0091] <Appendix>

[0092] The ship 1 described in the embodiment can be understood as follows, for example.

[0093] (1) The ship 1 according to the first embodiment includes: a hull 2; a combustion device 8 provided on the hull 2 for burning fuel; a carbon dioxide recovery unit 10 provided on the hull 2 for recovering carbon dioxide in the exhaust gas from the exhaust gas of the combustion device 8; and a blower unit 20 for sending the exhaust gas of the combustion device 8 to the carbon dioxide recovery unit 10. The blower unit 20 includes: a blower 21 for blowing the exhaust gas of the combustion device 8 toward the carbon dioxide recovery unit 10; and a flow rate adjustment unit 22 provided on the inlet side of the blower 21 for adjusting the flow rate of the exhaust gas sent to the carbon dioxide recovery unit 10 by the blower 21 by changing the opening degree.

[0094] The carbon dioxide recovery unit 10 recovers carbon dioxide in the exhaust gas generated by burning fuel in the combustion device 8. The blower unit 20 blows the exhaust gas of the combustion device 8 toward the carbon dioxide recovery unit by the blower 21. A flow rate adjustment unit 22 is provided on the inlet side of the blower 21. In the flow rate adjustment unit 22, the flow rate of the exhaust gas sent to the carbon dioxide recovery unit 10 by the blower 21 can be adjusted by changing the opening degree. Therefore, the opening degree of the flow rate adjustment unit 22 is changed according to the exhaust gas volume of the combustion device 8, so that the flow rate of the exhaust gas sent to the carbon dioxide recovery unit 10 can be appropriately adjusted. Therefore, in the carbon dioxide recovery unit 10, the operation of the exhaust gas with an excessive flow rate is not required, and the energy consumption can be suppressed. As a result, the carbon dioxide recovery unit 10 can be operated efficiently.

[0095] (2) The ship 1 according to the second embodiment is the ship 1 of (1), wherein the flow rate adjustment unit 22 includes: a central hub 25 extending in the direction of the axis O; and a plurality of movable vanes 24 arranged at intervals in the circumferential direction Dc around the axis O on the outer side Dro in the radial direction Dr centered on the axis O with respect to the central hub 25, and configured to be rotatable about shaft portions 24s, 24t extending in the radial direction Dr.

[0096] Thus, in the flow rate adjustment unit 22, the plurality of movable vanes 24 are rotated around the shaft portions 24s and 24t, thereby changing the opening degree, and thus the flow rate of the exhaust gas sent from the blower 21 to the carbon dioxide recovery unit 10 can be adjusted. And by configuring the flow rate adjustment unit 22 to rotate the plurality of movable vanes 24 around the shaft portions 24s and 24t, the followability to changes in the exhaust gas flow rate or the control accuracy can be improved, and the pressure loss can be reduced.

[0097] (3) The ship 1 according to the third embodiment is the ship 1 of (1) or (2), and further includes a control device 60 that controls the operation of the flow rate adjustment unit 22 according to the flow rate of the exhaust gas of the combustion device 8.

[0098] Thus, by controlling the control device 60 to control the operation of the flow rate adjustment unit 22 according to the flow rate of the exhaust gas of the combustion device 8, the carbon dioxide recovery unit 10 can be operated efficiently and can be automatically operated.

[0099] (4) The ship 1 according to the fourth embodiment is the ship 1 of (3), wherein the control device 60 controls the rotational speed of the blower 21.

[0100] In this way, by controlling the rotational speed of the blower 21, the flow rate of the exhaust gas sent from the blower 21 to the carbon dioxide recovery unit 10 can also be adjusted. Therefore, the energy consumption based on the blower 21 can be reduced.

[0101] (5) The ship 1 according to the fifth embodiment is the ship 1 of (3), wherein the carbon dioxide recovery unit 10 includes: an absorption tower 12 that introduces an absorption liquid capable of absorbing the exhaust gas of the combustion device 8 and carbon dioxide in the exhaust gas, and absorbs carbon dioxide in the exhaust gas through the absorption liquid; a regeneration tower 13 that heats the absorption liquid that has absorbed carbon dioxide and separates carbon dioxide from the absorption liquid; and a recovery unit 15 that recovers the carbon dioxide separated in the regeneration tower 13. The control device 60 further includes an information acquisition unit 71 that acquires information related to the load of the combustion device 8. The control device 60 controls the operation of the flow rate adjustment unit 22 according to the information related to the load of the combustion device 8 acquired by the information acquisition unit 71 to adjust the flow rate of the exhaust gas sent from the blower 21 to the carbon dioxide recovery unit 10.

[0102] Examples of the information related to the load of the combustion device 8 include the load in the combustion device 8, the fuel consumption in the combustion device 8, and the rotational speed of the supercharger in the case where the combustion device 8 is equipped with a supercharger.

[0103] In this structure, based on the information related to the load of the combustion device 8 acquired by the information acquisition unit 71, the operation of the flow rate adjustment unit 22 is controlled to adjust the flow rate of the exhaust gas sent from the blower 21 to the carbon dioxide recovery unit 10. Thereby, the carbon dioxide recovery unit 10 including the absorption tower 12, the regeneration tower 13, and the recovery unit 15 can be operated efficiently.

[0104] (6) The ship 1 according to the sixth embodiment is the ship 1 according to any one of (3) to (5), wherein the control device 60 adjusts the flow rate of the exhaust gas sent to the carbon dioxide recovery unit 10 through the flow rate adjustment unit 22 according to the required value of the carbon dioxide recovery capacity in the carbon dioxide recovery unit 10.

[0105] In this structure, the control device 60 adjusts the flow rate of the exhaust gas sent to the carbon dioxide recovery unit 10 through the flow rate adjustment unit 22 according to the required value of the carbon dioxide recovery capacity in the carbon dioxide recovery unit 10. Thereby, not only can the flow rate of the exhaust gas sent to the carbon dioxide recovery unit 10 be adjusted according to the amount of exhaust gas of the combustion device 8, but also according to the required value of the carbon dioxide recovery capacity set on the carbon dioxide recovery unit 10 side. Therefore, by suppressing the carbon dioxide recovery unit 10 from operating with an excessive carbon dioxide recovery capacity, the energy consumption based on the carbon dioxide recovery unit 10 can be suppressed.

[0106] Industrial applicability

[0107] The ship according to the present invention can provide a ship capable of efficiently recovering carbon dioxide according to the operating load of the combustion device.

[0108] Reference signs

[0109] 1 - Ship, 2 - Hull, 2a - Bow, 4 - Superstructure, 5A, 5B - Side, 6 - Bottom, 7 - Upper deck, 8 - Combustion device, 10 - Carbon dioxide recovery section, 11 - Exhaust gas cooling tower, 11a - Tower main body, 12 - Absorption tower, 12a - Tower main body, 13 - Regeneration tower, 13a - Tower main body, 14 - Exhaust gas scrubbing tower, 14a - Tower main body, 15 - Recovery section, 16 - Regeneration reflux tower, 18 - Reboiler, 19 - Condenser, 20 - Air supply section, 21 - Blower, 22 - Flow adjustment section, 22r - Exhaust gas flow path, 24 - Movable vane, 24s, 24t - Shaft portion, 25 - Central hub, 26 - Support, 31 - Coolant supply pump, 32A - First circulation pump, 32B - Second circulation pump, 33 - Cleaning liquid supply pump, 41, 43 - Heat exchanger, 60 - Control device, 61 - CPU, 62 - ROM, 63 - RAM, 64 - Storage device, 65 - Signal transceiver module, 70 - Signal input section, 71 - Information acquisition section, 72 - Exhaust gas flow control section, 73 - Pump output control section, 75 - Output section, 81 - Vapor supply pipe, 101 - Exhaust gas introduction pipe, 102 - Coolant supply system, 103 - Exhaust gas discharge pipe, 104 - Gas discharge pipe, 105 - Cleaning liquid supply system, 106 - Circulation system, 106A - Absorbent supply system, 106B - Absorbent discharge system, 106C - Heat exchanger, 107 - Exhaust pipe, 108 - Absorbent heating system, 109 - Gaseous carbon dioxide discharge pipeline, 110 - Reflux pipeline, 111 - Carbon dioxide discharge pipe, 112 - Reflux pump, Dc - Circumferential direction, Dr - Radial direction, Dri - Inner side, Dro - Outer side, FA - Bow - stern direction, O - Axis.

Claims

1. A ship, comprising: A hull; A combustion device, provided on the hull and burning fuel; A carbon dioxide recovery unit, provided on the hull and recovering carbon dioxide in the exhaust gas from the exhaust gas of the combustion device; and A blower unit that sends the exhaust gas of the combustion device into the carbon dioxide recovery unit, The blower unit comprising: A blower that blows the exhaust gas of the combustion device toward the carbon dioxide recovery unit; and A flow rate adjustment unit provided on the inlet side of the blower and adjusting the flow rate of the exhaust gas sent into the carbon dioxide recovery unit by the blower by changing the opening degree.

2. The ship according to claim 1, wherein The flow rate adjustment unit comprises: A central hub extending in the axial direction; and A plurality of movable vanes arranged at intervals in the circumferential direction around the axis on the radially outer side of the central hub with respect to the axis and configured to be rotatable about a shaft portion extending in the radial direction.

3. The ship according to claim 1 or 2, further comprising a control device that controls the operation of the flow rate adjustment unit according to the flow rate of the exhaust gas of the combustion device.

4. The ship according to claim 3, wherein The control device controls the rotational speed of the blower.

5. The ship according to claim 3, wherein The carbon dioxide recovery unit comprises: An absorption tower that introduces an absorption liquid capable of absorbing the exhaust gas of the combustion device and carbon dioxide in the exhaust gas and absorbs carbon dioxide in the exhaust gas by the absorption liquid; A regeneration tower that heats the absorption liquid that has absorbed carbon dioxide and separates carbon dioxide from the absorption liquid; and A recovery unit that recovers the carbon dioxide separated in the regeneration tower, The control device further comprises an information acquisition unit that acquires information related to the load of the combustion device, The control device controls the operation of the flow rate adjustment unit according to the information related to the load of the combustion device acquired by the information acquisition unit to adjust the flow rate of the exhaust gas sent into the carbon dioxide recovery unit by the blower.

6. The ship according to claim 3, wherein The control device adjusts the flow rate of the exhaust gas sent into the carbon dioxide recovery unit through the flow rate adjustment unit according to the required value of the carbon dioxide recovery capacity in the carbon dioxide recovery unit.

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