Ship

Abstract

This ship comprises: a hull; a combustion device that is provided to the hull and that burns fuel; an exhaust gas line that guides exhaust gas from the combustion device; a first boiler that is connected to the exhaust gas line and that uses the exhaust gas as a heat source to generate steam; a second boiler that has a combustor which burns fuel and that uses the combustor as a heat source to generate steam; and a carbon dioxide recovery device that is driven by the steam which is generated by the first boiler and / or the second boiler.

Description

Ship

[0001] The present disclosure relates to a ship. The present application claims priority from Japanese Patent Application No. 2025-044648 filed in Japan on March 19, 2025, the content of which is incorporated herein by reference.

[0002] Patent Document 1 discloses a configuration including an exhaust pipe that discharges exhaust gas from a combustion engine, and an economizer installed in the exhaust pipe that generates steam by heat exchange with the exhaust gas, wherein the generated steam is supplied to a carbon dioxide recovery device (carbon dioxide capture device).

[0003] Japanese Translation of PCT International Application Publication No. 2022-547102

[0004] Incidentally, in the configuration described in Patent Document 1, the amount of steam generated using the economizer alone is insufficient for the amount of steam required by the carbon dioxide recovery device, so it is necessary to generate the insufficient amount of steam. However, as the amount of steam generated increases, fuel consumption and carbon dioxide emissions also increase, so there is a demand for generating a necessary and sufficient amount of steam more efficiently.

[0005] The present disclosure has been made to solve the above problem, and an object of the present disclosure is to provide a ship capable of generating a necessary and sufficient amount of steam more efficiently.

[0006] In order to solve the above problem, a ship according to the present disclosure includes a hull, a combustion device, an exhaust gas line, a first boiler, a second boiler, and a carbon dioxide recovery device. The combustion device is provided in the hull and burns fuel. The exhaust gas line guides exhaust gas from the combustion device. The first boiler is connected to the exhaust gas line. The first boiler generates steam using the exhaust gas as a heat source. The second boiler has a combustor that burns fuel, and generates the steam using the combustor as a heat source. The carbon dioxide recovery device is driven by the steam generated by at least one of the first boiler and the second boiler.

[0007] According to the ship of the present disclosure, a necessary and sufficient amount of steam can be generated more efficiently.

[0008] This is a side view of a floating body equipped with a vessel according to an embodiment of this disclosure. This is a diagram showing the configuration of the steam generation unit of a vessel according to the first embodiment of this disclosure. This is a diagram showing the procedure for generating steam in the steam generation unit according to the first embodiment of this disclosure. This is a diagram showing the configuration of the steam generation unit of a vessel according to a first modification of the first embodiment of this disclosure. This is a diagram showing the configuration of the steam generation unit of a vessel according to a second embodiment of this disclosure. This is a diagram showing the configuration of the steam generation unit of a vessel according to a second modification of the second embodiment of this disclosure. This is a diagram showing the configuration of the steam generation unit of a vessel according to a third embodiment of this disclosure.

[0009] Hereinafter, a vessel according to the embodiments of this disclosure will be described with reference to Figures 1 to 8. <First Embodiment> (Overall Configuration of the Vessel) As shown in Figure 1, the vessel 1 of this embodiment comprises a hull 2, a combustion device 8, an exhaust gas line 11, a carbon dioxide recovery device 20, and a steam generation unit 30A. 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 the main engine 8A for propelling the ship 1 and the auxiliary engine 8B for power generation equipment that supplies electricity to the ship.

[0012] The exhaust gas line 11 guides the exhaust gas G1 (see Figure 2) from the combustion device 8 through the steam generation unit 30A to the carbon dioxide recovery device 20.

[0013] In this embodiment, the steam generation unit 30A and the carbon dioxide recovery device 20 are located on the upper deck 5. However, the arrangement of the steam generation unit 30A and the carbon dioxide recovery device 20 is not limited to the upper deck 5. For example, the steam generation unit 30A and the carbon dioxide recovery device 20 may be located inside the hull 2.

[0014] (Carbon Dioxide Recovery Device) Figure 2 is a diagram showing the configuration of the steam generation section of a ship according to the first embodiment of this disclosure. As shown in Figure 2, the carbon dioxide recovery device 20 recovers carbon dioxide contained in the exhaust gas G1 of the combustion device 8, which is introduced through the exhaust gas line 11. As a method of recovering carbon dioxide in the carbon dioxide recovery device 20, for example, a chemical absorption method in which carbon dioxide is absorbed by an absorbent liquid can be used. In addition, MEA (monoethanolamine) can be used as an absorbent liquid when carbon dioxide is absorbed by the chemical absorption method. The configuration of the carbon dioxide recovery device 20 is not limited in any way. The carbon dioxide recovery device 20 may be of other types.

[0015] In the carbon dioxide recovery device 20, gaseous carbon dioxide is separated from the absorbent liquid that has absorbed carbon dioxide. In the carbon dioxide recovery device 20, gaseous carbon dioxide is separated from the absorbent liquid by heating the absorbent liquid through heat exchange with steam supplied from the steam generation unit 30A. The regenerated absorbent liquid is circulated and used to recover carbon dioxide contained in the exhaust gas G1.

[0016] (Steam Generation Unit) The steam generation unit 30A generates steam used in the ship's steam-consuming equipment 70 and steam used for regenerating the absorbent liquid in the carbon dioxide recovery device 20. The steam generation unit 30A comprises a first boiler 40A, a second boiler 50, and a control unit 60.

[0017] The first boiler 40A includes a first drum 41A and a first economizer 42A. In this embodiment, the first boiler 40A is a composite boiler in which the first drum 41A and the first economizer 42A are integrated.

[0018] A water supply line 12 is connected to the first drum 41A, which supplies water from an external water supply source (not shown). The first drum 41A stores the water supplied from the external water supply source through the water supply line 12. The first drum 41A is equipped with a first burner 43. The first burner 43 uses the flame generated by burning fuel as a heat source to evaporate the water stored in the first drum 41A and generate steam. A first steam discharge line 13 is connected to the first drum 41A to discharge the generated steam.

[0019] The first economizer 42A is supplied with water from the water supply line 12, similar to the first drum 41A. The first economizer 42A is connected to the exhaust gas line 11. The first economizer 42A uses the exhaust gas G1 from the combustion device 8, which is supplied through the exhaust gas line 11, as a heat source to heat the water supplied to the first drum 41A. In this embodiment, the first economizer 42A uses the exhaust gas G1 from the main engine 8A of the combustion device 8 as a heat source to heat the water supplied to the first drum 41A. In other words, the first drum 41A generates steam using the water heated by the first economizer 42A using the exhaust gas G1 from the combustion device 8 as a heat source.

[0020] The second boiler 50 has a second drum 51. A feedwater line 14 is connected to the second drum 51 to supply water from an external water source. The second drum 51 stores the water supplied from the external water source through the feedwater line 14. The second drum 51 is equipped with a second burner 53. The second drum 51 generates steam using the second burner 53 as a heat source. The second burner 53 generates steam by evaporating the water stored in the second drum 51 using the flame generated by burning fuel as a heat source. A second steam discharge line 15 is connected to the second drum 51 to discharge the generated steam.

[0021] The second boiler 50 has a larger steam output than the first boiler 40A. For example, it is preferable that the steam output of the first boiler 40A be the amount required by the steam consuming equipment 70, and the steam output of the second boiler 50 be the amount required by the carbon dioxide recovery device 20. However, this is not limited to this.

[0022] The first steam outlet line 13 and the second steam outlet line 15 are connected to the steam outlet line 16. Steam generated by the first boiler 40A is sent to the steam outlet line 16 through the first steam outlet line 13. Steam generated by the second boiler 50 is sent to the steam outlet line 16 through the second steam outlet line 15 and merges with the steam from the first boiler 40A.

[0023] A first steam supply line 17 and a second steam supply line 18 are connected to the steam delivery line 16. The first steam supply line 17 is connected to steam consuming equipment 70 that consumes steam on board the ship. The second steam supply line 18 is connected to a carbon dioxide recovery device 20. With this configuration, at least a portion of the steam sent to the steam delivery line 16 is supplied to the steam consuming equipment 70 through the first steam supply line 17. At least a portion of the steam sent to the steam delivery line 16 is supplied to the carbon dioxide recovery device 20 through the second steam supply line 18. In this embodiment, the steam delivery line 16 has a larger flow path cross-sectional area than the first steam delivery line 13 and the second steam delivery line 15 in order to allow for pressure recovery of the steam flowing in from the first steam delivery line 13 and the second steam delivery line 15. Furthermore, the flow path cross-sectional area of ​​the steam delivery line 16 is larger than the flow path cross-sectional areas of the first steam supply line 17 and the second steam supply line 18. Note that the flow path cross-sectional area of ​​the steam delivery line 16 is not limited to the above configuration.

[0024] Each of the first steam supply line 17 and the second steam supply line 18 is provided with an on / off valve (not shown), which allows for adjustment of the amount of steam supplied to the steam consuming equipment 70 and the carbon dioxide recovery device 20, respectively (including the case of zero), as needed.

[0025] The steam generation unit 30A of this embodiment is equipped with a connection line 19A that allows exhaust gas G2 from the second burner 53 of the second boiler 50 to be introduced into the first boiler 40A. The connection line 19A is connected to the first economizer 42A. The first economizer 42A uses the exhaust gas G2 supplied through the connection line 19A, i.e., the exhaust gas G2 from the second burner 53, as a heat source to heat the water supplied to the first drum 41A. The first drum 41A can generate steam using the water heated by the first economizer 42A with the exhaust gas G2 from the second burner 53 as a heat source. In other words, the first boiler 40A can generate steam using at least one of the exhaust gas G1 supplied through the exhaust gas line 11 and the exhaust gas G2 supplied through the connection line 19A as a heat source. The first boiler 40A of this embodiment can generate steam using exhaust gas from at least one of the combustion device 8 and the second burner 53 as a heat source.

[0026] The exhaust gas G1 from the combustion device 8 after passing through the first economizer 42A, the exhaust gas G2 from the second burner 53, and the exhaust gas G3 from the first burner 43 are each released into the atmosphere. At least a portion of the exhaust gas G1 from the combustion device 8, the exhaust gas G2 from the second burner 53, and the exhaust gas G3 are sent to the carbon dioxide recovery device 20 prior to their release into the atmosphere, where carbon dioxide contained in the exhaust gases G1, G2, and G3 is recovered.

[0027] (Control Unit) The control unit 60 controls the operation of the steam generation unit 30A. Here, the control unit 60 may automatically control the steam generation unit 30A based on a preset program, or it may remotely control the steam generation unit 30A in response to input operations from the operator.

[0028] When the steam consuming equipment 70 is in operation but the carbon dioxide recovery device 20 is not, the steam generation unit 30A generates steam only in the first boiler 40A under the control of the control unit 60. In this case, steam is not generated in the second boiler 50. Specifically, in the first boiler 40A, the first economizer 42A heats water using exhaust gas G1 from the combustion device 8 (main engine 8A) as a heat source, and then supplies the heated water to the first drum 41A. In the first drum 41A, fuel is burned in the first burner 43, which evaporates the water supplied via the first economizer 42A and generates steam. The generated steam is supplied from the first drum 41A to the steam consuming equipment 70 through the first steam delivery line 13, the steam delivery line 16, and the first steam supply line 17.

[0029] When the steam generating unit 30A operates the steam consuming equipment 70 and the carbon dioxide recovery device 20 simultaneously, and when the steam consuming equipment 70 is not operated and only the carbon dioxide recovery device 20 is operated, the control unit 60 controls the steam generating unit 30A to generate steam in both the first boiler 40A and the second boiler 50. In this case, if a sufficient amount of steam can be generated, the control unit 60 may control the steam generating unit 30A to operate only in the second boiler 50. In the second boiler 50, the flame generated by burning fuel in the second burner 53 is used as a heat source to evaporate the water stored in the second drum 51 and generate steam. The generated steam is sent from the second drum 51 through the second steam delivery line 15 to the steam delivery line 16. The second boiler 50 also sends the exhaust gas G2 from the second burner 53 to the first economizer 42A through the connection line 19A.

[0030] In the first boiler 40A, the first economizer 42A heats water using exhaust gas G1 from the combustion device 8, which is supplied through the exhaust gas line 11, and exhaust gas G2 from the second burner 53, which is supplied through the connection line 19A, as heat sources. In the first drum 41A, the first burner 43 burns fuel, which evaporates the water heated through the first economizer 42A and generates steam. The generated steam is supplied from the first drum 41A to the steam supply line 16 through the first steam supply line 13.

[0031] The steam generated in the first boiler 40A and the steam generated in the second boiler 50, which are sent to the steam delivery line 16, are mixed within the steam delivery line 16, and a portion of this mixture is supplied to the steam consuming equipment 70 through the first steam supply line 17. The remaining steam sent to the steam delivery line 16 is supplied to the carbon dioxide recovery device 20 through the second steam supply line 18.

[0032] Incidentally, the pressure of the steam supplied from the steam generation unit 30A to the steam consumption equipment 70 and the carbon dioxide recovery device 20 may change due to fluctuations in the steam consumption of the steam consumption equipment 70 and the carbon dioxide recovery device 20, and fluctuations in the steam generation amount of the first boiler 40A and the second boiler 50. In response to this, it is preferable for the steam generation unit 30A to control the operation of the first boiler 40A and the second boiler 50 so that the pressure of the steam supplied to the steam consumption equipment 70 and the carbon dioxide recovery device 20 is maintained within a preset pressure range. Furthermore, the amount of steam required by the carbon dioxide recovery device 20 may be several times to more than ten times the amount of steam required by the steam consumption equipment 70. In response to this, it is preferable for the steam generation unit 30A to supply the carbon dioxide recovery device 20 with steam generated in the second boiler 50, which generates more steam than the first boiler 40A, as the main steam. Furthermore, in the steam generation unit 30A, if the amount of steam generated by the second boiler 50 is insufficient, it is preferable to supply the steam generated by the second boiler 50 and the first boiler 40A to the carbon dioxide recovery device 20.

[0033] Therefore, the steam generation unit 30A is equipped with a detection unit 90 for detecting the steam pressure. The detection unit 90 detects, for example, the steam pressure in the steam delivery line 16. The detection unit 90 may also be configured to detect, for example, the steam pressure in the second steam supply line 18. Here, if the amount of steam generated by the steam generation unit 30A is insufficient for the amount of steam required by the carbon dioxide recovery device 20, the steam pressure detected by the detection unit 90 will decrease.

[0034] Figure 3 is a diagram showing the procedure for steam generation in the steam generation unit according to the first embodiment of the present disclosure. The steam generation unit 30A, under the control of the control unit 60, generates steam in the first boiler 40A and the second boiler 50 based on the steam pressure detected by the detection unit 90, in the following procedure. As shown in Figure 3, the steam generation unit 30A repeatedly performs the following series of steps at predetermined intervals while the carbon dioxide recovery device 20 is in operation. First, at predetermined intervals, it is determined whether the steam pressure detected by the detection unit 90 has fallen below a preset first threshold (step S11). If the acquired steam pressure is not below a preset first threshold (step S11: No), the process is terminated, and step S11 is executed again after a predetermined time has elapsed.

[0035] If the detected steam pressure is below a preset first threshold (Step S11: Yes), it is further determined whether the detected steam pressure has fallen below a second threshold that is lower than the preset first threshold (Step S12).

[0036] As a result, if the pressure of the acquired steam is not below the second threshold (step S12: No), the amount of steam supplied from the second boiler 50 to the carbon dioxide recovery device 20 through the second steam supply line 18 is increased (step S13). To increase the amount of steam supplied from the second boiler 50 to the carbon dioxide recovery device 20, the amount of heating of the second drum 51 by the second burner 53 is increased.

[0037] On the other hand, if the steam pressure obtained in step S12 is below the second threshold (step S12: Yes), the amount of steam supplied from the first boiler 40A to the carbon dioxide recovery device 20 through the second steam supply line 18 is increased (step S14). To increase the amount of steam supplied from the first boiler 40A to the carbon dioxide recovery device 20, the amount of heating of the first drum 41A by the first burner 43 is increased.

[0038] The steam generation unit 30A repeatedly performs the procedures shown in steps S11 to S13 above while the carbon dioxide recovery device 20 is in operation, thereby preventing any shortage of steam supplied to the carbon dioxide recovery device 20.

[0039] (Effects) In the ship 1 of the above embodiment, steam can be generated by the first boiler 40A and the second boiler 50. This makes it possible to increase the amount of steam generated. The carbon dioxide recovery device 20 is driven by the steam generated by at least one of the first boiler 40A and the second boiler 50. Therefore, when the amount of steam required by the carbon dioxide recovery device 20 is small, the carbon dioxide recovery device 20 can be driven by the steam generated by at least one of the first boiler 40A and the second boiler 50. Also, when the amount of steam required by the carbon dioxide recovery device 20 is large, the carbon dioxide recovery device 20 can be driven by the steam generated by both the first boiler 40A and the second boiler 50. As a result, a sufficient amount of steam can be generated more efficiently. Furthermore, since the first boiler 40A in this embodiment has a first burner 43, when the amount of steam required by the carbon dioxide recovery device 20 is small, for example, the carbon dioxide recovery device 20 can be driven by the steam generated by at least one of the first boiler 40A and the second boiler 50, without using the first burner 43. Furthermore, for example, if the amount of steam required by the carbon dioxide recovery device 20 is large, the carbon dioxide recovery device 20 can be driven by both the steam generated by the first boiler 40A using the first burner 43 and the steam generated by the second boiler 50.

[0040] Furthermore, in the above embodiment, the first boiler 40A generates steam using exhaust gas from at least one of the combustion device 8 and the second burner 53 of the second boiler 50 as a heat source, thereby enabling efficient steam generation in the first boiler 40A.

[0041] Furthermore, in the above embodiment, the steam generation rate of the second boiler 50 is set to be greater than that of the first boiler 40A. This allows the carbon dioxide recovery device 20 to be supplied with steam generated in the second boiler 50 as the main steam, and if the amount of steam generated in the second boiler 50 is insufficient, steam generated in both the second boiler 50 and the first burner 43 of the first boiler 40A can be supplied. This allows steam to be generated while both the first boiler 40A and the second boiler 50 operate stably. Alternatively, the carbon dioxide recovery device 20 may be supplied with steam generated in the second boiler 50 as the main steam, along with steam generated from the first boiler 40A using exhaust gas as a heat source without using the first burner 43.

[0042] Furthermore, in the above embodiment, the control unit 60 controls the steam generation in the first boiler 40A and the second boiler 50 based on the steam pressure in the second steam supply line 18 detected by the detection unit 90. When the steam pressure falls below a first threshold, the control unit 60 increases the amount of steam supplied from the second boiler 50 to the carbon dioxide recovery device 20. Also, when the steam pressure falls below a second threshold, which is lower than the first threshold, the control unit 60 increases the amount of steam supplied from the first boiler 40A to the carbon dioxide recovery device 20. In this way, the carbon dioxide recovery device 20 is mainly supplied with steam generated in the second boiler 50, and if the amount of steam generated in the second boiler 50 is insufficient, steam generated in both the second boiler 50 and the first boiler 40A can be supplied. Also, when the steam pressure falls below a first threshold, increasing the amount of steam supplied from the second boiler 50 to the carbon dioxide recovery device 20 eliminates the need to increase the amount of steam supplied from the first boiler 40A to the carbon dioxide recovery device 20. Furthermore, if the steam pressure falls below a second threshold, which is lower than the first threshold, increasing the steam supply from the first boiler 40A to the carbon dioxide recovery device 20 eliminates the need to increase the steam supply from the second boiler 50 to the carbon dioxide recovery device 20. This configuration allows for easy control of both the first boiler 40A and the second boiler 50. As a result, steam can be generated while both the first boiler 40A and the second boiler 50 operate stably.

[0043] (First Modification of the First Embodiment) In the first embodiment described above, the first boiler 40A is a so-called composite boiler in which the first drum 41A and the first economizer 42A are integrated, but the configuration is not limited to this. Figure 4 is a diagram showing the configuration of the steam generation section of a ship according to the first modification of the first embodiment of the present disclosure. As shown in Figure 4, in the steam generation section 30B of the ship 1 of this first modification, the first boiler 40B comprises a first drum 41B and a first economizer 42B which is separate from the first drum 41B.

[0044] The first drum 41B is connected to the water supply line 12. The first economizer 42B is connected to the first drum 41B via a water supply line 121 and a circulation line 122. Part of the water supplied to the first drum 41B through the water supply line 12 circulates between the first economizer 42B through the water supply line 121 and the circulation line 122. The first economizer 42B is connected to the exhaust gas line 11. The first economizer 42B uses the exhaust gas G1 from the combustion device 8 sent through the exhaust gas line 11 as a heat source to heat the water supplied to the first drum 41B. The first economizer 42B of the first modification uses the exhaust gas G1 from the main engine 8A of the combustion device 8 as a heat source to heat the water supplied to the first drum 41B.

[0045] In the first modification, the connection line 19B that can introduce the exhaust gas G2 from the second burner 53 of the second boiler 50 into the first boiler 40B is connected to the first economizer 42B. The first economizer 42B can generate steam using the exhaust gas G2 from the second burner 53 supplied through the connection line 19B as a heat source.

[0046] According to the configuration described above, similar to the first embodiment, the carbon dioxide capture device 20 is driven by steam generated by at least one of the first boiler 40B and the second boiler 50. As a result, a necessary and sufficient amount of steam can be generated more efficiently.

[0047] (Second modification of the first embodiment) In the above embodiment, the first economizer 42A of the first boiler 40A uses the exhaust gas G1 from the main engine 8A of the combustion device 8 as a heat source to heat the water supplied to the first drum 41A, but the present invention is not limited thereto. Fig. 5 is a diagram showing the configuration of a steam generation unit of a ship according to the second modification of the first embodiment of the present disclosure. As shown in Fig. 5, in the steam generation unit 30C of the ship 1 of the present embodiment, the first economizer 42C of the first boiler 40C uses the exhaust gas G4 from the auxiliary engine 8B of the combustion device 8 as a heat source to heat the water supplied to the first drum 41A.

[0048] The first boiler 40C includes a first drum 41A and a first economizer 42C. A water supply line 12 configured to supply water from an external water supply source is connected to the first drum 41A. The first drum 41A is provided with a first burner 43. The first burner 43 uses flame generated by burning fuel as a heat source to evaporate water stored in the first drum 41A to generate steam. A first steam delivery line 13 configured to deliver the generated steam is connected to the first drum 41A.

[0049] Water is supplied from the water supply line 12 to the first economizer 42C in the same manner as to the first drum 41C. The first economizer 42C is connected to an exhaust gas line 11 through which exhaust gas G4 from an auxiliary machine 8B flows. The first economizer 42C uses, as a heat source, the exhaust gas G4 fed through the exhaust gas line 11 from the auxiliary machine 8B serving as a combustion device 8, and heats water supplied to the first drum 41A.

[0050] A steam generation unit 30C according to the second modification includes a connection line 19C capable of introducing exhaust gas G2 from a second burner 53 of a second boiler 50 into the first boiler 40C. The connection line 19C is connected to the first economizer 42C. The first economizer 42C uses, as a heat source, the exhaust gas G2 fed through the connection line 19C from the second burner 53, and heats water supplied to the first drum 41A. That is, the first boiler 40C can generate steam using, as heat sources, the exhaust gas G4 fed through the exhaust gas line 11 from the auxiliary machine 8B and the exhaust gas G2 fed through the connection line 19 from the second burner 53. The first boiler 40C according to the second modification can generate steam using exhaust gas from at least one of the auxiliary machine 8B and the second burner 53 as a heat source.

[0051] Furthermore, in the steam generation unit 30C of this second modified example, exhaust gas G1 from the main engine 8A is supplied to the first boiler 80C for the main engine 8A through the exhaust gas line 11 for the main engine 8A. The first boiler 80C includes a drum (not shown) and an economizer (not shown). The economizer heats water supplied from an external water supply source using the exhaust gas G1 from the main engine 8A as a heat source. The drum heats the water heated by the economizer using a flame from a burner (not shown) as a heat source to generate steam. The steam generated by the first boiler 80C is supplied to the steam consuming equipment 70 and the carbon dioxide recovery device 20 through a steam supply line (not shown). Note that the first boiler 80C can also be configured without a burner (not shown).

[0052] In the second modification of the first embodiment described above, similar to the first embodiment, the carbon dioxide recovery device 20 is driven by steam generated by at least one of the first boiler 40C and the second boiler 50. As a result, a sufficient amount of steam can be generated more efficiently. In addition to the above, steam generated by the first boiler 80C using exhaust gas G1 from the main engine 8A as a heat source can be supplied to the carbon dioxide recovery device 20. Therefore, the steam supplied to the carbon dioxide recovery device 20 can be generated more efficiently.

[0053] <Second Embodiment> Next, a second embodiment of the vessel according to the present disclosure will be described. In the second embodiment described below, the same reference numerals are used for the same parts as in the first embodiment, and redundant explanations will be omitted. Figure 6 is a diagram showing the configuration of the steam generation unit of the vessel according to the second embodiment of the present disclosure. As shown in Figure 6, the steam generation unit 30D of the vessel 1 of this embodiment includes a first boiler 40D, a second boiler 50D, and a control unit 60.

[0054] The first boiler 40D includes a first drum 41D and a first economizer 42D. In this embodiment, the first boiler 40D is a composite boiler in which the first drum 41D and the first economizer 42D are integrated. However, the first boiler 40D may also have the first drum 41D and the first economizer 42D provided as separate components.

[0055] The first drum 41D is connected to a water supply line 12 that supplies water from an external water supply source (not shown). The first drum 41D stores the water supplied from the external water supply source through the water supply line 12. The first drum 41D is equipped with a first burner 43. The first burner 43 uses the flame generated by burning fuel as a heat source to evaporate the water stored in the first drum 41D and generate steam. The first drum 41D is connected to a first steam discharge line 13 that discharges the generated steam.

[0056] The first economizer 42D is supplied with water from the water supply line 12, similar to the first drum 41D. The first economizer 42D is connected to the exhaust gas line 11. The first economizer 42D uses the exhaust gas G1 from the combustion device 8, which is supplied through the exhaust gas line 11, as a heat source to heat the water supplied to the first drum 41D. In this embodiment, the first economizer 42D uses the exhaust gas G1 from the main engine 8A of the combustion device 8 as a heat source to heat the water supplied to the first drum 41D.

[0057] The second boiler 50D includes a second drum 51 and a second economizer 52D. The second drum 51 stores water supplied from an external water source through a feedwater line 14. The second drum 51 is equipped with a second burner 53. The second drum 51 generates steam using the second burner 53 as a heat source. The second burner 53 generates steam by evaporating the water stored in the second drum 51 using the flame generated by burning fuel as a heat source. A second steam discharge line 15 is connected to the second drum 51 for discharging the generated steam.

[0058] In this embodiment, the second boiler 50D generates steam using the exhaust gas G2 from the second burner 53 as a heat source, in addition to the second burner 53. The second economizer 52D in this embodiment is connected to the second drum 51 via a feedwater line 141 and a circulation line 142. A portion of the water supplied to the second drum 51 through the feedwater line 14 circulates between the second economizer 52D and the feedwater line 141 and the circulation line 142. The second economizer 52D is connected to a connection line 19D through which the exhaust gas G2 from the second burner 53 of the second boiler 50D can be introduced. The second economizer 52D heats the water supplied to the second drum 51 using the exhaust gas G2 from the second burner 53, which is supplied through the connection line 19D, as a heat source.

[0059] (Effects) In the ship 1 of the second embodiment described above, the second boiler 50D generates steam using the exhaust gas G2 from the second burner 53 as a heat source in addition to the second burner 53, thereby enabling more efficient steam generation in the second boiler 50D.

[0060] Furthermore, in the second embodiment described above, steam can be generated by the first boiler 40D and the second boiler 50D, similar to the first embodiment. This allows for an increase in the amount of steam generated. The carbon dioxide recovery device 20 is driven by the steam generated by at least one of the first boiler 40D and the second boiler 50D. As a result, a sufficient amount of steam can be generated more efficiently.

[0061] (Modification of the Second Embodiment) Figure 7 shows the configuration of a steam generation unit of a ship according to a modification of the second embodiment of the present disclosure. As shown in Figure 7, the steam generation unit 30E of the ship 1 of this embodiment includes a first boiler 80E for the main engine 8A, a first boiler 81E for the auxiliary engine 8B, and a second boiler 50E. Exhaust gas G1 from the main engine 8A is supplied to the first boiler 80E for the main engine 8A through the exhaust gas line 11 for the main engine 8A. The first boiler 80E includes a drum (not shown) and an economizer (not shown). The economizer heats water supplied from an external water supply source using the exhaust gas G1 from the main engine 8A as a heat source. The drum heats the water heated by the economizer using a flame from a burner (not shown) as a heat source to generate steam. The steam generated by the first boiler 80E is supplied to steam consuming equipment 70 and carbon dioxide recovery equipment 20 through a steam supply line (not shown). Furthermore, the first boiler 80E can also be configured without a burner (not shown).

[0062] The exhaust gas G4 from the auxiliary engine 8B is supplied to the first boiler 81E for the auxiliary engine 8B through the exhaust gas line 11 for the auxiliary engine 8B. The first boiler 81E includes a drum (not shown) and an economizer (not shown). The economizer heats water supplied from an external water source using the exhaust gas G4 from the auxiliary engine 8B as a heat source. The drum heats the water heated by the economizer using a flame from a burner (not shown) as a heat source to generate steam. The steam generated by the first boiler 81E is supplied to the steam consuming equipment 70 and the carbon dioxide recovery device 20 through the first steam delivery line 13, the steam delivery line 16, and the first steam supply line 17. The first boiler 81E can also be configured without a burner (not shown).

[0063] The second boiler 50E includes a second drum 51 and a second economizer 52E. The second drum 51 stores water supplied from an external water source through a feedwater line 14. The second drum 51 is equipped with a second burner 53. The second drum 51 generates steam using the second burner 53 as a heat source. The second burner 53 generates steam by evaporating the water stored in the second drum 51 using the flame generated by burning fuel as a heat source. A second steam discharge line 15 is connected to the second drum 51 for discharging the generated steam.

[0064] In a modified version of the second embodiment, the second boiler 50E generates steam using the exhaust gas G2 from the second burner 53 as a heat source, in addition to the second burner 53. The second economizer 52E in this embodiment is connected to the second drum 51 via a feedwater line 141 and a circulation line 142. A portion of the water supplied to the second drum 51 through the feedwater line 14 circulates between the second economizer 52E and the feedwater line 141 and the circulation line 142. The second economizer 52E is connected to a connection line 19E through which the exhaust gas G2 from the second burner 53 of the second boiler 50E can be introduced. The second economizer 52E heats the water supplied to the second drum 51 using the exhaust gas G2 from the second burner 53, which is supplied through the connection line 19E, as a heat source.

[0065] (Effects) In the modified version of the second embodiment described above, the second boiler 50E generates steam using the exhaust gas G2 from the second burner 53 as a heat source in addition to the second burner 53, thereby enabling efficient steam generation in the second boiler 50E.

[0066] Furthermore, in the modified version of the second embodiment described above, steam can be generated by the first boilers 80E, 81E and the second boiler 50E, similar to the second modified version of the first embodiment described above. This makes it possible to increase the amount of steam generated. The carbon dioxide recovery device 20 is driven by the steam generated by at least one of the first boilers 80E, 81E and the second boiler 50E. As a result, a sufficient amount of steam can be generated more efficiently.

[0067] <Third Embodiment> Next, a third embodiment of the vessel according to the present disclosure will be described. In the third embodiment described below, the same reference numerals are used for the same parts as in the first embodiment, and redundant explanations will be omitted. Figure 8 is a diagram showing the configuration of the steam generation unit of the vessel according to the third embodiment of the present disclosure. As shown in Figure 8, the steam generation unit 30F of the vessel 1 of this embodiment includes a first boiler 40F, a second boiler 50F, and a control unit 60.

[0068] The first boiler 40F includes a first drum 41F and a first economizer 42F. In this embodiment, the first boiler 40F is a composite boiler in which the first drum 41F and the first economizer 42F are integrated. However, the first boiler 40F may also have the first drum 41F and the first economizer 42F provided as separate components.

[0069] The first drum 41F stores water supplied from an external water source through a water supply line 12. The first drum 41F is equipped with a first burner 43. The first burner 43 uses the flame generated by burning fuel as a heat source to evaporate the water stored in the first drum 41F and generate steam. A first steam discharge line 13 is connected to the first drum 41F to discharge the generated steam.

[0070] The first economizer 42F is supplied with water from the water supply line 12, similar to the first drum 41F. The first economizer 42F is connected to the exhaust gas line 11. The first economizer 42F uses the exhaust gas G1 from the combustion device 8, which is supplied through the exhaust gas line 11, as a heat source to heat the water supplied to the first drum 41F. In this embodiment, the first economizer 42F uses the exhaust gas G1 from the main engine 8A of the combustion device 8 as a heat source to heat the water supplied to the first drum 41F.

[0071] The second boiler 50F has a second drum 51. The second drum 51 stores water supplied from an external water source through a feedwater line 14. The second drum 51 is equipped with a second burner 53. The second drum 51 generates steam using the second burner 53 as a heat source. The second burner 53 generates steam by evaporating the water stored in the second drum 51, using the flame generated by burning fuel as a heat source. A second steam discharge line 15 is connected to the second drum 51 to discharge the generated steam.

[0072] In this embodiment, the second boiler 50F generates steam using the second burner 53 as a heat source, and also generates steam using the exhaust gas G2 from the second burner 53 as a heat source. The second boiler 50F in this embodiment is equipped with a feedwater heater 101 and an air heater 102. Although the example shows the case where both the feedwater heater 101 and the air heater 102 are provided, it is also possible to provide only one of the feedwater heater 101 or the air heater 102.

[0073] The feedwater heater 101 is installed in the middle of the feedwater line 14. A connection line 19F is connected to the feedwater heater 101, which allows the introduction of exhaust gas G2 from the second burner 53 of the second boiler 50F. The feedwater heater 101 heats the water supplied to the second drum 51 using the exhaust gas G2 from the second burner 53, which is supplied through the connection line 19F, as a heat source.

[0074] The air heater 102 is located in the middle of the air supply line 119 that supplies combustion air to the second burner 53. The air heater 102 is connected to a connection line 19F that allows the introduction of exhaust gas G2 from the second burner 53 of the second boiler 50F. The air heater 102 uses the exhaust gas G2 from the second burner 53, which is supplied through the connection line 19F, as a heat source to heat the combustion air supplied to the second burner 53.

[0075] (Effects) In the ship 1 of the three embodiments described above, the second boiler 50F generates steam using the exhaust gas from the second burner 53 as a heat source in addition to the second burner 53, thereby enabling efficient steam generation in the second boiler 50F.

[0076] Furthermore, in the third embodiment described above, steam can be generated by the first boiler 40F and the second boiler 50F, similar to the first embodiment. This allows for an increase in the amount of steam generated. The carbon dioxide recovery device 20 is driven by the steam generated by at least one of the first boiler 40F and the second boiler 50F. As a result, a sufficient amount of steam can be generated more efficiently.

[0077] (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, second boilers 50, 50D to 50F are provided, but multiple sets of second boilers 50, 50D to 50F may be provided. Also, multiple second burners 53 may be provided in the second boilers 50, 50D to 50F.

[0078] Furthermore, although the above embodiment and its modifications have described control by the control unit 60, the content of the control by the control unit 60, the processing procedures, etc. can be changed as appropriate.

[0079] <Note> The vessel 1 described in each embodiment can be understood, for example, as follows.

[0080] (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, an exhaust gas line 11 for guiding exhaust gas from the combustion device 8, a first boiler 40A connected to the exhaust gas line 11 and generating steam using the exhaust gas as a heat source, a second boiler 50 having a combustor 53 for burning fuel and generating steam using the combustor 53 as a heat source, and a carbon dioxide recovery device 20 driven by the steam generated by at least one of the first boiler 40A and the second boiler 50.

[0081] This allows for an increase in the amount of steam generated. The carbon dioxide recovery device 20 is driven by steam generated by at least one of the first boiler 40A and the second boiler 50. Therefore, when the amount of steam required by the carbon dioxide recovery device 20 is small, the carbon dioxide recovery device 20 can be driven by steam generated by either the first boiler 40A or the second boiler 50. Conversely, when the amount of steam required by the carbon dioxide recovery device 20 is large, the carbon dioxide recovery device 20 can be driven by steam generated by both the first boiler 40A and the second boiler 50. As a result, a sufficient amount of steam can be generated more efficiently.

[0082] (2) The vessel 1 according to the second embodiment is the vessel 1 of (1), further comprising a connection line 19 that can introduce the exhaust gas from the combustor 53 into the first boiler 40A, wherein the first boiler 40A generates steam using the exhaust gas from at least one of the combustion device 8 and the combustor 53 as a heat source.

[0083] This allows for more efficient steam generation in the first boiler 40A.

[0084] (3) The vessel 1 according to the third embodiment is the vessel 1 of (1), wherein the second boiler 50 generates steam using the exhaust gas from the combustor 53 as a heat source, in addition to the combustor 53.

[0085] This allows for more efficient steam generation in the second boiler 50.

[0086] (4) The vessel 1 according to the fourth embodiment is any one of the vessels 1 from (1) to (3), wherein the second boiler 50 has a larger steam output than the first boiler 40A.

[0087] This allows the carbon dioxide recovery device 20 to be primarily supplied with steam generated by the second boiler 50, and if the amount of steam generated by the second boiler 50 is insufficient, steam generated by both the second boiler 50 and the first boiler 40A can be supplied. This enables the generation of steam while stably operating both the first boiler 40A and the second boiler 50.

[0088] (5) The vessel 1 according to the fifth embodiment is the vessel 1 according to (4), and includes a first steam supply line 17 capable of supplying the steam generated in the first boiler 40A to a steam consuming device 70, a second steam supply line 18 capable of supplying the steam generated in at least one of the first boiler 40A and the second boiler 50 to the carbon dioxide recovery device 20, a detection unit 90 for detecting the pressure of the steam, and based on the pressure of the steam detected by the detection unit 90, the first boiler 40A and the second boiler 50 The system further includes a control unit 60 for controlling the generation of the steam, the control unit 60 increases the amount of steam supplied from the second boiler 50 to the carbon dioxide recovery device 20 through the second steam supply line 18 when the steam pressure falls below a preset first threshold, and increases the amount of steam supplied from the first boiler 40A to the carbon dioxide recovery device 20 through the second steam supply line 18 when the steam pressure falls below a second threshold which is lower than the preset first threshold.

[0089] As a result, the steam generated in the second boiler 50 is supplied to the carbon dioxide recovery device 20 as the main steam, and if the amount of steam generated in the second boiler 50 is insufficient, steam generated in both the second boiler 50 and the first boiler 40A can be supplied. Furthermore, when the steam pressure falls below the first threshold, increasing the amount of steam supplied from the second boiler 50 to the carbon dioxide recovery device 20 eliminates the need to increase the amount of steam supplied from the first boiler 40A to the carbon dioxide recovery device 20. Also, when the steam pressure falls below a second threshold, which is lower than the first threshold, increasing the amount of steam supplied from the first boiler 40A to the carbon dioxide recovery device 20 eliminates the need to increase the amount of steam supplied from the second boiler 50 to the carbon dioxide recovery device 20. This configuration allows for easy control of the first boiler 40A and the second boiler 50. This enables the stable operation of both the first boiler 40A and the second boiler 50 while generating steam.

[0090] According to the vessel of this disclosure, a sufficient amount of steam can be generated more efficiently.

[0091] 1. Ship 2. Hull 3A, 3B 4. Bottom 5. Upper Deck 6. Superstructure 8. Combustion System 8A Main Engine 8B Auxiliary Engine 11. Exhaust Gas Line 12, 121 Feedwater Line 13. First Steam Outlet Line 14, 141 Feedwater Line 15. Second Steam Outlet Line 16. Steam Outlet Line 17. First Steam Supply Line 18. Second Steam Supply Line 19A-19F Connection Line 20. Carbon Dioxide Capture Unit 30A-30F Steam Generation Unit 40A-40D, 40F, 80C, 80E, 81E First Boiler 41A, 41B, 41D, 41F First Drum 42A, 42B, 42C, 42D, 42F First Economizer 43. First Burner 50, 50D-50F Second boiler 51 Second drum 52D, 52E Second economizer 53 Second burner (combustion device) 60 Control unit 70 Steam consumption equipment 90 Detection unit 101 Feedwater heater 102 Air heater 119 Air supply line 122, 142 Circulation line

Claims

1. A vessel comprising: a hull; a combustion device provided in the hull for burning fuel; an exhaust gas line for guiding exhaust gas from the combustion device; a first boiler connected to the exhaust gas line and generating steam using the exhaust gas as a heat source; a second boiler having a combustor for burning fuel and generating steam using the combustor as a heat source; and a carbon dioxide recovery device driven by the steam generated by at least one of the first boiler and the second boiler.

2. The vessel according to claim 1, further comprising a connection line that allows the exhaust gas from the combustor to be introduced into the first boiler, wherein the first boiler generates steam using the exhaust gas from at least one of the combustion device and the combustor as a heat source.

3. The ship according to claim 1, wherein the second boiler generates steam using the exhaust gas from the combustor as a heat source, in addition to the combustor.

4. The ship according to claim 1, wherein the second boiler has a larger steam output than the first boiler.

5. The vessel according to claim 4, further comprising: a first steam supply line capable of supplying the steam generated in the first boiler to steam consuming equipment; a second steam supply line capable of supplying the steam generated in at least one of the first boiler and the second boiler to the carbon dioxide recovery device; a detection unit for detecting the pressure of the steam; and a control unit that controls the generation of the steam in the first boiler and the second boiler based on the pressure of the steam detected by the detection unit, wherein the control unit increases the amount of steam supplied from the second boiler to the carbon dioxide recovery device through the second steam supply line when the pressure of the steam falls below a preset first threshold, and increases the amount of steam supplied from the first boiler to the carbon dioxide recovery device through the second steam supply line when the pressure of the steam falls below a second threshold lower than a preset first threshold.

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