Carbon dioxide recovery system

Abstract

This carbon dioxide recovery system is provided in a floating body and comprises: an absorption column into which exhaust gas from a combustion device for burning fuel and an absorption liquid capable of absorbing carbon dioxide within the exhaust gas are introduced, and which causes the carbon dioxide within the exhaust gas to be absorbed by the absorption liquid; a regeneration column for heating the absorption liquid that has absorbed the carbon dioxide and separating the carbon dioxide from the absorption liquid; a circulation system having a circulation pump for causing the absorption liquid to circulate between the absorption column and the regeneration column; a recovery unit for recovering the carbon dioxide separated by the regeneration column; an information acquisition unit for acquiring information related to the load of the combustion device; and a control device for controlling the output of the circulation pump on the basis of information related to the load of the combustion device.

Description

Carbon dioxide capture system

[0001] This disclosure relates to a carbon dioxide capture system. This application claims priority to Japanese Patent Application No. 2024-064601, filed on April 12, 2024, the contents of which are incorporated herein by reference.

[0002] Patent Document 1 discloses an exhaust gas treatment device including a reaction tower, a jetting unit, and a flow rate control unit. The reaction tower is introduced with exhaust gas and supplied with a liquid for treating the exhaust gas. The jetting unit jets the liquid into the reaction tower. The flow rate control unit controls the flow rate of the liquid supplied to the reaction tower.

[0003] International Publication No. 2021 / 111957

[0004] Incidentally, exhaust gas treatment devices such as those described in Patent Document 1 require energy to drive pumps for supplying liquids such as absorbent and water used to treat the exhaust gas. However, in a floating body such as a ship, the energy used within the float must be obtained from a generator or the like provided on the float, and the amount of energy available within the float is limited. Therefore, it is desirable to reduce the energy consumption by exhaust gas treatment devices installed on the floating body.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a carbon dioxide capture system that can reduce energy consumption.

[0006] In order to solve the above problems, the carbon dioxide capture system according to the present disclosure is a carbon dioxide capture system installed on a floating body. The carbon dioxide capture system includes an absorption tower, a regeneration tower, a circulation system, a capture unit, an information acquisition unit, and a control device. The absorption tower receives exhaust gas from a combustion device that combusts fuel and an absorption liquid capable of absorbing carbon dioxide in the exhaust gas. The absorption tower absorbs the carbon dioxide in the exhaust gas with the absorption liquid. The regeneration tower heats the absorption liquid that has absorbed the carbon dioxide, and separates the carbon dioxide from the absorption liquid. The circulation system includes a circulation pump. The circulation pump circulates the absorption liquid between the absorption tower and the regeneration tower. The capture unit captures the carbon dioxide separated in the regeneration tower. The information acquisition unit acquires information related to the load of the combustion device. The control device controls the output of the circulation pump based on the information related to the load of the combustion device.

[0007] a control device that controls the output of the cleaning liquid supply pump based on the information related to the load of the combustion device, and the control device controls the output of the cleaning liquid supply pump based on the information related to the load of the combustion device.

[0008] a control device that controls the output of the cleaning liquid supply pump based on the information related to the load of the combustion device, and the control device controls the output of the cleaning liquid supply pump based on the information related to the load of the combustion device, and the control device controls the output of the cleaning liquid supply pump based on the information related to the load of the combustion device.

[0009] The carbon dioxide capture system of the present disclosure can reduce energy consumption.

[0010] Fig. 1 is a side view of a floating body equipped with a carbon dioxide capture system according to an embodiment of the present disclosure; Fig. 2 is a diagram illustrating a configuration of a carbon dioxide capture system according to an embodiment of the present disclosure; Fig. 3 is a diagram illustrating a hardware configuration of a control device of the carbon dioxide capture system according to an embodiment of the present disclosure; Fig. 4 is a functional block diagram of the control device according to an embodiment of the present disclosure.

[0011] A carbon dioxide capture system according to an embodiment of the present disclosure will be described below with reference to FIGS. 1 to 4. (Configuration of Floating Body) As shown in FIG. 1, a floating body 1 according to an embodiment of the present disclosure includes at least a floating body main body 2, a superstructure 4, a combustion device 8, and a carbon dioxide capture system 10. The floating body 1 according to this embodiment will be described as a ship capable of navigation using a main engine or the like. The type of ship of the floating body 1 is not limited to a specific type of ship. Examples of the type of ship of the floating body 1 include a liquefied gas carrier, a ferry, a RORO ship, a car carrier, and a passenger ship. While this embodiment describes a case where the floating body 1 is a ship, the floating body 1 is not limited to a ship and may also be an FSU (Floating Storage Unit), FSRU (Floating Storage and Regasification Unit), or the like, which is not capable of navigation using a main engine or the like.

[0012] The floating body main body 2 has a pair of side walls 5A, 5B that form its outer hull, and a bottom 6. The side walls 5A, 5B each have a pair of side shell plates that form the port and starboard sides, respectively. The bottom 6 has a bottom shell plate that connects the side walls 5A, 5B. The pair of side walls 5A, 5B and the bottom 6 give the outer hull of the floating body main body 2 a U-shape in cross section perpendicular to the bow-stern direction FA.

[0013] The floating body 2 further includes an upper deck 7, which is a full-length deck located at the top. The superstructure 4 is formed on the upper deck 7. Accommodation areas and the like are provided within the superstructure 4. In the floating body 1 of this embodiment, for example, a cargo space (not shown) for carrying cargo is provided closer to the bow 2a in the bow-stern direction FA than the superstructure 4.

[0014] The combustion device 8 is a device that generates thermal energy by burning fuel, and is provided inside the floating body main body 2. Examples of the combustion device 8 include an internal combustion engine used as the main engine for propelling the floating body 1, an internal combustion engine used in a power generation facility that supplies electricity to the ship, and a boiler that generates steam as a working fluid.

[0015] (Configuration of Carbon Dioxide Capture System) The carbon dioxide capture system 10 captures carbon dioxide in the exhaust gas from the combustion device 8. The carbon dioxide capture system 10 is provided on the floating body 2. The carbon dioxide capture system 10 exemplified in this embodiment is provided on the upper deck 7 of the floating body 2, but the location of the carbon dioxide capture system 10 is not limited to on the upper deck 7.

[0016] 2 is a diagram showing the configuration of a carbon dioxide capture system according to an embodiment of the present disclosure. As shown in Fig. 2, the carbon dioxide capture system 10 includes an exhaust gas cooling tower 11, an absorption tower 12, a regeneration tower 13, an exhaust gas scrubbing tower (exhaust gas scrubbing unit) 14, a capture unit 15, and a control device 60.

[0017] The exhaust gas cooling tower 11 cools the exhaust gas from the combustion device 8 (see Figure 1) (for example, to about 40°C) using the water surrounding the floating body 2 or fresh water stored in a fresh water tank (not shown) provided inside the floating body 2 as a cooling liquid.

[0018] An exhaust gas introduction pipe 101 for feeding exhaust gas from the combustion device 8 is connected to the lower part of the exhaust gas cooling tower 11. A blower 21 for feeding the exhaust gas in the exhaust gas introduction pipe 101 into the exhaust gas cooling tower 11 is provided in the middle of the exhaust gas introduction pipe 101. The blower 21 may be any blower as long as it is capable of feeding exhaust gas into the absorption tower 12, and 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.

[0019] The exhaust gas cooling tower 11 includes a tower body 11a and a nozzle (not shown) that sprays a coolant from the upper part of the tower body 11a. A coolant supply system 102 that circulates the 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 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 body 11a.

[0020] A coolant supply pump 31 and a heat exchanger 41 are provided in the coolant supply system 102. The coolant supply pump 31 sucks the coolant accumulated at the bottom of the tower body 11a from inside the tower body 11a and supplies it to a nozzle at the top of the tower body 11a. The coolant supplied to the nozzle is sprayed from the nozzle into the tower body 11a and comes into contact with the flue gas sent into the tower body 11a. This cools the flue gas, and the coolant captures and washes away soot and dust contained in the flue gas.

[0021] The heat exchanger 41 exchanges heat between the cooling water supplied from outside the carbon dioxide capture system 10 and the cooling liquid flowing in the cooling liquid supply system 102. In other words, the heat exchanger 41 cools the cooling liquid flowing in the cooling liquid supply system 102 with the cooling water supplied from outside the carbon dioxide capture system 10.

[0022] One end of an exhaust gas discharge pipe 103 is connected to the top of the tower body 11a. The exhaust gas discharge pipe 103 is cooled by a cooling liquid in the tower body 11a, and sends the exhaust gas from which soot and dust have been washed away to the absorption tower 12.

[0023] The absorption tower 12 absorbs carbon dioxide contained in the flue gas into an absorbing solution. The absorption tower 12 includes a tower body 12a and a nozzle (not shown) that sprays the absorbing solution from the upper part of the tower body 12a. The other end of the flue gas discharge pipe 103 is connected to the lower part of the tower body 12a. The flue gas that has passed through the flue gas cooling tower 11 is sent into the tower body 12a through the flue gas discharge pipe 103.

[0024] The absorbing liquid is supplied from the regenerator 13 via a circulation system 106, which will be described later. The absorber 12, for example, drops the absorbing liquid from nozzles in the tower body 12a and brings it into contact with the flue gas introduced into the absorber 12, thereby causing the carbon dioxide contained in the flue gas to be absorbed by the absorbing liquid. The absorber 12 absorbs the carbon dioxide contained in the flue gas into the absorbing liquid, for example, by chemical absorption. In this embodiment, MEA (monoethanolamine) is used as the absorbing liquid that absorbs carbon dioxide by chemical absorption. An absorbing liquid other than MEA may also be used.

[0025] The flue gas after the carbon dioxide has been absorbed by the absorbing liquid is introduced into the flue gas scrubbing tower (flue gas scrubbing section) 14 through the gas discharge pipe 104 from the top of the tower body 12a. The flue gas scrubbing tower 14 drops a scrubbing liquid from the upper part of the flue gas scrubbing tower 14 to wash away the absorbing liquid contained in the flue gas that has left the absorption tower 12. In other words, the flue gas scrubbing tower 14 scrubs the absorbing liquid contained in the flue gas by bringing the scrubbing liquid into contact with the flue gas in which carbon dioxide has been absorbed by the absorbing liquid of the absorption tower 12. In this embodiment, for example, the scrubbing liquid is water surrounding the floating body 2 or fresh water stored in a fresh water tank (not shown) provided within the floating body 2. The flue gas scrubbing tower 14 includes a tower body 14a and a nozzle (not shown) that sprays the scrubbing liquid from the upper part of the tower body 14a.

[0026] A cleaning liquid supply system 105 that circulates a cleaning liquid is connected to the exhaust gas scrubbing tower 14. One end of the cleaning liquid supply system 105 is connected to the bottom of the tower body 14a. The other end of the cleaning liquid supply system 105 is connected to a nozzle (not shown) in the tower body 14a at the top of the tower body 14a. A cleaning liquid supply pump 33 and a heat exchanger 43 are provided in the cleaning liquid supply system 105.

[0027] The washing liquid supply pump 33 sucks the washing liquid from the bottom of the tower body 14a and supplies it to a nozzle at the top of the tower body 14a. The washing liquid supplied to the nozzle is sprayed from the nozzle into the tower body 14a and comes into contact with the flue gas sent into the tower body 14a. As a result, the absorbing liquid contained in the flue gas is captured by the washing liquid and washed away.

[0028] The heat exchanger 43 exchanges heat between cooling water supplied from outside the carbon dioxide capture system 10 and the cleaning liquid flowing in the cleaning liquid supply system 105. In other words, the heat exchanger 43 cools the cleaning liquid circulating in the cleaning liquid supply system 105 with cooling water supplied from outside the carbon dioxide capture system 10. Then, the cleaning liquid cooled by this heat exchanger 43 is sprayed into the tower body 14a from a nozzle at the top of the tower body 14a.

[0029] One end of an exhaust pipe 107 is connected to the top of the tower body 14a. The exhaust pipe 107 guides the exhaust gas that has left the exhaust gas scrubbing tower 14, in other words, the exhaust gas from which the absorbing liquid has been removed by the exhaust gas scrubbing tower 14, to, for example, an exhaust funnel (not shown) or the like provided on the floating body 1, and releases the exhaust gas into the atmosphere.

[0030] A circulation system 106 is provided between the absorption tower 12 and a regeneration tower 13, which will be described later, to circulate the absorbing liquid between the absorption tower 12 and the regeneration tower 13. The circulation system 106 includes an absorbing liquid supply system 106A, an absorbing liquid discharge system 106B, and a heat exchanger 106C.

[0031] One end of the absorbing liquid supply system 106A is connected to the bottom of the tower body 13a of the regenerator 13. The other end of the absorbing liquid supply system 106A is connected to a nozzle (not shown) in the tower body 12a at the top of the tower body 12a of the absorber 12. A first circulating pump (circulating pump) 32A is provided in the middle of the absorbing liquid supply system 106A. The first circulating pump 32A sucks the absorbing liquid from the bottom of the tower body 13a of the regenerator 13 through the absorbing liquid supply system 106A and supplies it to a nozzle at the top of the tower body 12a of the absorber 12.

[0032] One end of the absorbent discharge system 106B is connected to the bottom of the tower body 12a of the absorber 12. The other end of the absorbent discharge system 106B is connected to a nozzle (not shown) provided in the tower body 13a at the top of the tower body 13a of the regenerator 13. A second circulating pump (circulating pump) 32B is provided in the middle of the absorbent discharge system 106B. The second circulating pump 32B sucks the absorbent from the bottom of the tower body 12a of the absorber 12 through the absorbent discharge system 106B and supplies it to a nozzle at the top of the tower body 13a of the regenerator 13.

[0033] The heat exchanger 106C exchanges heat between the absorbing liquid flowing in the absorbing liquid supply system 106A and the absorbing liquid flowing in the absorbing liquid discharge system 106B. In other words, the heat of the absorbing liquid immediately after the carbon dioxide is separated by the regeneration tower 13 heats the absorbing liquid that has absorbed carbon dioxide before being introduced into the regeneration tower 13.

[0034] The regeneration tower 13 separates gaseous carbon dioxide from the absorbing solution that has absorbed carbon dioxide in the absorption tower 12. More specifically, the regeneration tower 13 heats, by an absorption solution heating system 108, the absorbing solution that has been sent from the absorption tower 12 to the regeneration tower 13 via an absorption solution discharge system 106B.

[0035] The absorption liquid heating system 108 is connected to the regenerator 13. The absorption liquid heating system 108 circulates the absorption liquid between the regenerator 13 and the reboiler 18. That is, the absorption liquid heating system 108 supplies the absorption liquid taken out from the regenerator 13 to the reboiler 18, and returns the absorption liquid from the reboiler 18 to the regenerator 13. In other words, the reboiler 18 is provided midway through 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) or the like in the floating body 2 is sent to the reboiler 18 through this steam supply pipe 81. The reboiler 18 exchanges heat between the steam sent through the steam supply pipe 81 and the absorption liquid flowing through the absorption liquid heating system 108. That is, the reboiler 18 heats the absorption liquid with the heat of the steam.

[0036] In this embodiment, a steam supply amount adjusting unit 80 is provided in the steam supply pipe 81. The steam supply amount adjusting unit 80 exemplified in this embodiment is a so-called flow rate adjusting valve, and is capable of adjusting the flow rate of steam sent to the reboiler through the steam supply pipe 81.

[0037] The absorption liquid heated by the reboiler 18 has gaseous carbon dioxide separated from it. Then, the absorption liquid and gaseous carbon dioxide are returned to the tower main body 13a. The absorption liquid from which the gaseous carbon dioxide has been separated and regenerated is returned to the absorption tower 12 through the absorption liquid supply system 106A and reused. Meanwhile, the separated gaseous carbon dioxide is sent to the recovery section 15 through the gaseous carbon dioxide discharge line 109. A condenser 19 is provided in the gaseous carbon dioxide discharge line 109. The condenser 19 condenses the moisture contained in the gaseous carbon dioxide by heat exchange with cooling water supplied from outside the carbon dioxide recovery system 10.

[0038] The recovery section 15 recovers the gaseous carbon dioxide separated in the regeneration tower 13. The recovery section 15 includes a regeneration reflux tower 16. The regeneration reflux tower 16 separates the gaseous carbon dioxide sent via the condenser 19 from the condensed water resulting from condensation of moisture.

[0039] The condensed water after gas-liquid separation is returned from the bottom of the regeneration reflux tower 16 to the regeneration tower 13 through a reflux line 110. A reflux pump 112 is provided in the reflux line 110 to return the condensed water to the regeneration tower 13. Meanwhile, the gaseous carbon dioxide from which moisture has been removed in the regeneration reflux tower 16 is discharged to the outside of the carbon dioxide capture system 10 through a carbon dioxide discharge pipe 111. The gaseous carbon dioxide discharged through the carbon dioxide discharge pipe 111 is stored, for example, in a carbon dioxide capture tank (not shown) provided in the floating body main body 2. At this time, the gaseous carbon dioxide may be liquefied by an appropriate carbon dioxide liquefaction device and stored in the carbon dioxide capture tank.

[0040] In the carbon dioxide capture system 10 as described above, the flue gas discharged from the combustion device 8 is cooled and washed in the flue gas cooling tower 11, and then introduced into the absorption tower 12. In the absorption tower 12, carbon dioxide contained in the flue gas is absorbed by an absorption liquid. The flue gas from which carbon dioxide has been separated by absorption of the carbon dioxide in the absorption liquid is washed in an flue gas scrubbing tower 14 and then released into the atmosphere. Furthermore, the absorption liquid that has absorbed the carbon dioxide contained in the flue gas in the absorption tower 12 is sent to the regeneration tower 13 via a circulation system 106. The absorption liquid that has absorbed the carbon dioxide is heated by a reboiler 18 to increase its temperature, and the gaseous carbon dioxide contained in the absorption liquid is separated. The separated gaseous carbon dioxide is recovered via the regeneration reflux tower 16. Meanwhile, the absorption liquid from which carbon dioxide has been separated in the regeneration tower 13 is circulated to the absorption tower 12 via the circulation system 106.

[0041] The control device 60 controls the outputs of the coolant supply pump 31, the first circulating pump 32A, the second circulating pump 32B, and the cleaning liquid supply pump 33, based on information related to the load of the combustion device 8. Furthermore, the control device 60 adjusts the amount of steam supplied in the steam supply amount adjusting unit 80 to heat the absorption liquid in the absorption liquid heating system 108, based on information related to the load of the combustion device 8. Here, the information related to the load of the combustion device 8 is information that varies according to changes in the load of the combustion device 8. In this embodiment, the carbon dioxide capture system 10 includes, for example, an exhaust gas flow rate sensor 201, an exhaust gas temperature sensor 202, and an absorption liquid circulation flow rate sensor 203.

[0042] The exhaust gas flow sensor 201 detects the flow rate of the exhaust gas introduced from the combustion device 8 through the exhaust gas introduction pipe 101. The flow rate of the exhaust gas introduced from the combustion device 8 is information related to the load of the combustion device 8, which varies in accordance with changes in the load of the combustion device 8.

[0043] The exhaust gas temperature sensor 202 detects, for example, the outlet temperature of the exhaust gas at the outlet side of the exhaust gas cooling tower 11. The exhaust gas temperature sensor 202 may also detect, for example, the inlet temperature of the exhaust gas at the inlet side of the exhaust gas cooling tower 11. The temperature of the exhaust gas is information related to the load of the combustion device 8, which fluctuates in accordance with changes in the load of the combustion device 8.

[0044] The absorbing liquid circulation flow rate sensor 203 detects the flow rate of the absorbing liquid circulating through the circulation system 106. The absorbing liquid circulation flow rate sensor 203 may be provided in at least one of the absorbing liquid supply system 106A and the absorbing liquid discharge system 106B. The exhaust gas flow rate sensor 201, the exhaust gas temperature sensor 202, and the absorbing liquid circulation flow rate sensor 203 transmit their respective detection signals to the control device 60.

[0045] The coolant supply pump 31, the first circulation pump 32A, the second circulation pump 32B, and the cleaning liquid supply pump 33 illustrated in this embodiment are all electric pumps driven by motors (not shown). The control device 60 controls the rotation speed of each motor of the coolant supply pump 31, the first circulation pump 32A, the second circulation pump 32B, and the cleaning liquid supply pump 33, thereby controlling the output of each pump. Specifically, the control device 60 controls the rotation speed of each motor that drives the coolant supply pump 31, the first circulation pump 32A, the second circulation pump 32B, and the cleaning liquid supply pump 33, thereby controlling the output of each pump. In this embodiment, so-called inverter control is performed, in which the rotation speed of each motor is controlled by increasing or decreasing the current supplied to each motor using an inverter (not shown). An example of the inverter control method used by the control device 60 is PWM (Pulse Width Modulation) control. An example of a method for adjusting each pump output in accordance with information related to the load of the combustion device 8 is to linearly or stepwise increase or decrease each pump output within a range greater than 0 in accordance with an increase or decrease in the load of the combustion device 8. Another example of a method for adjusting each pump output in accordance with information related to the load of the combustion device 8 is to use a table, map, formula, or the like of information related to the load of the combustion device 8 and each pump output, which is created in advance based on a simulation, an experiment, or the like.

[0046] (Hardware configuration diagram) Fig. 3 is a diagram showing the hardware configuration of a control device of a carbon dioxide capture system according to an embodiment of the present disclosure. As shown in Fig. 3, the control device 60 is a computer including a CPU (Central Processing Unit) 61, a ROM (Read Only Memory) 62, a RAM (Random Access Memory) 63, a storage 64, and a signal transmission / reception module 65. The signal transmission / reception module 65 receives detection signals from each of the exhaust gas flow rate sensor 201, the exhaust gas temperature sensor 202, and the absorption liquid circulation flow rate sensor 203.

[0047] (Functional Block Diagram) Fig. 4 is a functional block diagram of a control device according to an embodiment of the present disclosure. As shown in Fig. 4, a CPU 61 of the control device 60 executes a program pre-stored in a storage device such as a ROM 62 or a storage 64, thereby realizing the functional configurations of a signal input unit 70, an information acquisition unit 71, an adjustment control unit 72, and an output unit 75. The signal input unit 70 receives detection signals from an exhaust gas flow rate sensor 201, an exhaust gas temperature sensor 202, and an absorption liquid circulation flow rate sensor 203 via a signal transmission / reception module 65, which is hardware.

[0048] The information acquiring unit 71 acquires information related to the load of the combustion device 8 based on the detection signal received by the signal input unit 70. Specifically, the information acquiring unit 71 in this embodiment acquires the flow rate of the exhaust gas detected by the exhaust gas flow rate sensor 201, the outlet temperature of the exhaust gas detected by the exhaust gas temperature sensor 202, and the flow rate of the absorbing liquid detected by the absorbing liquid circulation flow rate sensor 203 as information related to the load of the combustion device 8.

[0049] The adjustment control unit 72 controls the outputs of the coolant supply pump 31, the first circulating pump 32A, the second circulating pump 32B, and the cleaning liquid supply pump 33 based on information related to the load of the combustion device 8 acquired by the information acquisition unit 71. The adjustment control unit 72 controls the amount of steam supplied to the absorption liquid heating system 108 (reboiler 18) based on information related to the load of the combustion device 8.

[0050] More specifically, the adjustment control unit 72 controls the outputs of the first circulation pump 32A and the second circulation pump 32B based on the flow rate of exhaust gas acquired by the information acquisition unit 71. In other words, the adjustment control unit 72 sets the outputs of the first circulation pump 32A and the second circulation pump 32B to preset outputs in accordance with the flow rate of exhaust gas acquired by the information acquisition unit 71. As a result, the outputs of the first circulation pump 32A and the second circulation pump 32B increase when the flow rate of exhaust gas increases and decrease when the flow rate of exhaust gas decreases. The adjustment control unit 72 of this embodiment increases or decreases the outputs of the first circulation pump 32A and the second circulation pump 32B by the above-mentioned inverter control in accordance with the flow rate of exhaust gas acquired by the information acquisition unit 71.

[0051] Furthermore, the adjustment control unit 72 controls the output of the coolant supply pump 31 based on the exhaust gas outlet temperature acquired by the information acquisition unit 71. In other words, the adjustment control unit 72 sets the output of the coolant supply pump 31 to a preset output in accordance with the exhaust gas outlet temperature acquired by the information acquisition unit 71. As a result, the output of the coolant supply pump 31 increases when the exhaust gas outlet temperature rises and decreases when the exhaust gas outlet temperature drops. The adjustment control unit 72 of this embodiment increases or decreases the output of the coolant supply pump 31 by the above-mentioned inverter control in accordance with the exhaust gas outlet temperature acquired by the information acquisition unit 71.

[0052] Furthermore, the adjustment control unit 72 controls the output of the cleaning liquid supply pump 33 based on the circulation flow rate of the absorbent acquired by the information acquisition unit 71. In other words, the adjustment control unit 72 sets the output of the cleaning liquid supply pump 33 to a preset output in accordance with the circulation flow rate of the absorbent acquired by the information acquisition unit 71. As a result, the output of the cleaning liquid supply pump 33 increases when the circulation flow rate of the absorbent increases, and decreases when the circulation flow rate of the absorbent decreases. The adjustment control unit 72 of this embodiment increases or decreases the output of the cooling liquid supply pump 31 by the above-mentioned inverter control in accordance with the circulation flow rate of the absorbent acquired by the information acquisition unit 71.

[0053] Furthermore, the adjustment control unit 72 controls the amount of steam supplied to the absorption liquid heating system 108 (reboiler 18) based on the circulation flow rate of the absorption liquid acquired by the information acquisition unit 71. In other words, the adjustment control unit 72 sets the valve aperture of the steam supply amount adjustment unit 80, which is a flow rate adjustment valve, to a preset valve aperture in accordance with the circulation flow rate of the absorption liquid acquired by the information acquisition unit 71. As a result, the valve aperture of the steam supply amount adjustment unit 80 increases when the circulation flow rate of the absorption liquid increases, and decreases when the circulation flow rate of the absorption liquid decreases.

[0054] Based on the output information of the adjustment control unit 72, the output unit 75 outputs control signals for changing the outputs of the first circulation pump 32A and the second circulation pump 32B, the outputs of the coolant supply pump 31 and the cleaning liquid supply pump 33, and the opening degree of the steam supply amount adjustment unit 80. The control signals output from the output unit 75 are transmitted to the outputs of the first circulation pump 32A and the second circulation pump 32B, the coolant supply pump 31 and the cleaning liquid supply pump 33, and the steam supply amount adjustment unit 80 via the signal transmission / reception module 65, which is hardware.

[0055] (Effects) In the carbon dioxide capture system 10 of the above embodiment, the outputs of the first circulation pump 32A and the second circulation pump 32B are controlled based on information related to the load on the combustion device 8 acquired by the information acquisition unit 71. The information related to the load on the combustion device 8 changes depending on the magnitude of the load on the combustion device 8. As a result, when the load on the combustion device 8 is small, the outputs of the first circulation pump 32A and the second circulation pump 32B can be reduced. Therefore, the amount of absorption liquid circulated can be adjusted to an appropriate amount at an appropriate time depending on the load on the combustion device 8. As a result, energy consumption in the carbon dioxide capture system 10 can be reduced.

[0056] Furthermore, in the above embodiment, the flow rate of exhaust gas, which changes depending on the magnitude of the load on the combustion device 8, is acquired as information related to the load on the combustion device 8. As a result, in accordance with changes in the magnitude of the load on the combustion device 8, when the load on the combustion device 8 is small, the outputs of the first circulation pump 32A and the second circulation pump 32B can be reduced.

[0057] Furthermore, in the above embodiment, the output of the coolant supply pump 31 is controlled based on information related to the load on the combustion device 8. This makes it possible to reduce the output of the coolant supply pump 31 when the load on the combustion device 8 is small. As a result, it is possible to reduce energy consumption in the carbon dioxide capture system 10.

[0058] Furthermore, in the above embodiment, the outlet temperature of the exhaust gas, which changes depending on the magnitude of the load on the combustion device 8, is acquired as information related to the load on the combustion device 8. As a result, in accordance with the change in the magnitude of the load on the combustion device 8, when the load on the combustion device 8 is small, the output of the coolant supply pump 31 can be reduced.

[0059] Furthermore, in the above embodiment, the steam supply amount adjusting unit 80 controls the amount of steam supplied to the absorption liquid heating system 108 based on information related to the load on the combustion device 8. As a result, when the load on the combustion device 8 is small, the amount of steam supplied to the absorption liquid heating system 108 can be reduced. Therefore, the amount of steam generated externally to be supplied to the absorption liquid heating system 108 can be reduced. As a result, the energy consumption in the carbon dioxide capture system 10 can be reduced.

[0060] Furthermore, in the above embodiment, the circulating flow rate of the absorption liquid in the circulation system 106, which changes depending on the magnitude of the load on the combustion device 8, is acquired as information related to the load on the combustion device 8. As a result, in accordance with the change in the magnitude of the load on the combustion device 8, when the load on the combustion device 8 is small, the amount of steam supplied to the absorption liquid heating system 108 can be reduced.

[0061] Furthermore, in the above embodiment, the output of the cleaning liquid supply pump 33 is controlled based on information related to the load on the combustion device 8. This makes it possible to reduce the output of the cleaning liquid supply pump 33 when the load on the combustion device 8 is small. As a result, it is possible to reduce energy consumption in the carbon dioxide capture system 10.

[0062] Furthermore, in the above embodiment, the circulating flow rate of the absorption liquid in the circulation system 106, which changes depending on the magnitude of the load on the combustion device 8, is acquired as information related to the load on the combustion device 8. As a result, in accordance with the change in the magnitude of the load on the combustion device 8, when the load on the combustion device 8 is small, the output of the cleaning liquid supply pump 33 can be reduced.

[0063] Other Embodiments Although the embodiments of the present disclosure have been described above in detail with reference to the drawings, the specific configuration is not limited to this embodiment and includes design modifications within the scope of the present disclosure. In the above embodiment, the control device 60 acquires the flow rate of the exhaust gas introduced into the absorber 12 as information related to the load of the combustion device 8 to control the output of the first circulation pump 32A and the second circulation pump 32B. However, this is not limited to this. As information related to the load of the combustion device 8 to control the output of the first circulation pump 32A and the second circulation pump 32B, the control device 60 may acquire, for example, at least one of the amount of carbon dioxide contained in the exhaust gas, the fuel consumption of the combustion device 8, and the load of the combustion device 8, which can be acquired from a controller (not shown) of the combustion device 8. Furthermore, if the combustion device 8 is a main engine or a generator, the control device 60 may use the rotation speed of the main engine or the generator or the rotation speed of a turbocharger of the main engine as one piece of information related to the load of the combustion device 8.

[0064] Furthermore, in the above embodiment, the control device 60 acquires the temperature of the exhaust gas as information related to the load on the combustion device 8 in order to control the output of the coolant supply pump 31, but this is not limiting. In order to control the output of the coolant supply pump 31, the control device 60 may acquire, for example, the concentration of soot contained in the exhaust gas as information related to the load on the combustion device 8. The soot concentration may be acquired, for example, using a smoke meter that measures the degree to which particles contained in the exhaust gas absorb or scatter light.

[0065] Furthermore, in the above embodiment, the control device 60 acquires the circulation flow rate of the absorption liquid in the circulation system 106 as information related to the load on the combustion device 8 in order to control the amount of steam supplied by the steam supply amount adjustment unit 80, but this is not limited to this. In order to control the amount of steam supplied by the steam supply amount adjustment unit 80, the control device 60 may acquire, for example, the concentration of a substance (MEA) that absorbs carbon dioxide in the absorption liquid, in other words, the carbon dioxide concentration in the absorption liquid, as information related to the load on the combustion device 8. For example, the carbon dioxide concentration in the absorption liquid can be measured by a gas concentration measurement device.

[0066] In the above embodiment, the control device 60 controls the output of the first circulation pump 32A, the output of the second circulation pump 32B, the output of the coolant supply pump 31, the output of the cleaning liquid supply pump 33, and the valve opening of the steam supply amount adjustment unit 80, which is a flow rate adjustment valve, based on information related to the load of the combustion device 8. However, the control device 60 may control only the output of the circulation pumps, i.e., the output of the first circulation pump 32A and the output of the second circulation pump 32B, based on information related to the load of the combustion device 8. The control device 60 may also be configured to appropriately combine the control of the output of the circulation pumps based on information related to the load of the combustion device 8 with the control of the output of the coolant supply pump 31, the output of the cleaning liquid supply pump 33, and the valve opening of the steam supply amount adjustment unit 80, which is a flow rate adjustment valve, based on information related to the load of the combustion device 8.

[0067] Furthermore, in the above embodiment, the control device 60 controls the output of the first circulation pump 32A and the output of the second circulation pump 32B, as well as the output of the coolant supply pump 31, the output of the cleaning liquid supply pump 33, and the valve opening degree of the steam supply amount adjuster 80, which is a flow rate adjustment valve, based on information related to the load of the combustion device 8. However, the control device 60 may, for example, control at least one of the output of the cleaning liquid supply pump 33 and the output of the coolant supply pump 31 based on information related to the load of the combustion device 8, without controlling the output of the first circulation pump 32A and the output of the second circulation pump 32B based on information related to the load of the combustion device 8. In other words, the control device 60 may control only the output of the cleaning liquid supply pump 33, or only the output of the coolant supply pump 31, or only two outputs, the output of the cleaning liquid supply pump 33 and the output of the coolant supply pump 31, based on information related to the addition of the combustion device 8. As a result, when the load on the combustion device 8 is small, at least one of the output of the cleaning liquid supply pump 33 and the output of the cooling liquid supply pump 31 can be reduced, thereby reducing energy consumption in the carbon dioxide capture system 10.

[0068] Furthermore, in the above embodiment, the control device 60 controls the output of the first circulation pump 32A, the output of the second circulation pump 32B, the output of the coolant supply pump 31, the output of the cleaning liquid supply pump 33, and the valve opening degree of the steam supply amount adjustment unit 80, which is a flow rate adjustment valve, but similarly, the blower 21 may also be inverter-controlled to control the airflow rate based on information related to the load on the combustion device 8. As a result, when the load on the combustion device 8 is small, the airflow rate of the blower 21 can be reduced, thereby reducing energy consumption in the carbon dioxide capture system 10.

[0069] In the above embodiment, the output of the first circulation pump 32A and the output of the second circulation pump 32B are controlled based on the flow rate of the exhaust gas. In the above embodiment, the output of the coolant supply pump 31 is controlled based on the outlet temperature of the exhaust gas. In the above embodiment, the output of the cleaning liquid supply pump 33 is controlled based on the circulation flow rate of the absorbing liquid in the circulation system 106. In the above embodiment, the amount of steam supplied to the absorption liquid heating system 108 is controlled based on the circulation flow rate of the absorbing liquid in the circulation system 106. In other words, in the above embodiment, the control device 60 controls the output of the first circulation pump 32A, the output of the second circulation pump 32B, the output of the coolant supply pump 31, the output of the cleaning liquid supply pump 33, and the valve opening of the steam supply amount adjustment unit 80, which is a flow rate adjustment valve, based on individually acquired information. However, the present invention is not limited to the above configuration, and it is also possible to control all of the output of the first circulation pump 32A, the output of the second circulation pump 32B, the output of the coolant supply pump 31, the output of the cleaning liquid supply pump 33, and the valve opening degree of the steam supply amount adjustment unit 80 based on, for example, at least one piece of information such as the flow rate of exhaust gas from the combustion device 8 and the load on the combustion device 8 itself (for example, the operating speed).

[0070] Furthermore, the control device 60 may, for example, control some of the first circulation pump 32A, the second circulation pump 32B, the coolant supply pump 31, and the cleaning liquid supply pump 33 based on information related to the load of the combustion device 8, and control the remaining of the first circulation pump 32A, the second circulation pump 32B, the coolant supply pump 31, and the cleaning liquid supply pump 33 to change in conjunction with some of the first circulation pump 32A, the second circulation pump 32B, the coolant supply pump 31, and the cleaning liquid supply pump 33. In this way, the remaining of the first circulation pump 32A, the second circulation pump 32B, the coolant supply pump 31, and the cleaning liquid supply pump 33 are substantially controlled based on the information related to the load of the combustion device 8.

[0071] In the above embodiment, the absorber 12 and the flue gas scrubbing tower 14 are provided separately. However, the present invention is not limited to this configuration. For example, the absorber 12 may be integrated with the flue gas scrubbing tower 14 by providing an exhaust gas scrubbing unit in the upper part of the absorber 12.

[0072] <Additional Notes> The carbon dioxide capture system 10 described in the embodiment can be understood, for example, as follows.

[0073] (1) A carbon dioxide capture system 10 according to a first aspect is a carbon dioxide capture system 10 provided on a floating body 1, and includes: an absorption tower 12 into which exhaust gas from a combustion device 8 that combusts fuel and an absorption liquid capable of absorbing carbon dioxide in the exhaust gas are introduced, and which causes the carbon dioxide in the exhaust gas to be absorbed by the absorption liquid; a regeneration tower 13 that heats the absorption liquid that has absorbed the carbon dioxide and separates the carbon dioxide from the absorption liquid; a circulation system 106 having circulation pumps 32A, 32B that circulate the absorption liquid between the absorption tower 12 and the regeneration tower 13; a capture unit 15 that captures the carbon dioxide separated in the regeneration tower 13; an information acquisition unit 71 that acquires information related to the load on the combustion device 8; and a control device 60 that controls the output of the circulation pumps 32A, 32B based on the information related to the load on the combustion device 8. Examples of the floating body 1 include ships such as liquefied gas carriers, ferries, RORO ships, car carriers, and passenger ships, as well as FSUs (Floating Storage Units), FSRUs (Floating Storage and Regasification Units), etc. Examples of the combustion device 8 include an internal combustion engine used in the main engine for propelling the floating body 1, an internal combustion engine used in a power generation facility that supplies electricity onboard, and a boiler that generates steam as a working fluid. Examples of information related to the load of the combustion device 8 include the flow rate of the exhaust gas introduced into the absorption tower 12, the amount of carbon dioxide contained in the exhaust gas, the load of the combustion device 8, the fuel consumption of the combustion device 8, the rotation speed of the main engine and generator serving as the combustion device 8, and the rotation speed of a turbocharger for the main engine serving as the combustion device 8.

[0074] This carbon dioxide capture system 10 controls the outputs of the circulation pumps 32A, 32B based on information related to the load on the combustion device 8 acquired by the information acquisition unit 71. The information related to the load on the combustion device 8 changes depending on the magnitude of the load on the combustion device 8. This makes it possible to reduce the outputs of the circulation pumps 32A, 32B when the load on the combustion device 8 is small. As a result, it is possible to reduce energy consumption in the carbon dioxide capture system 10.

[0075] (2) A carbon dioxide capture system 10 according to a second aspect is the carbon dioxide capture system 10 of (1), in which the information acquisition unit 71 acquires at least one of the flow rate of the exhaust gas introduced into the absorption tower 12, the amount of carbon dioxide contained in the exhaust gas, and the load of the combustion device 8 as information related to the load of the combustion device 8.

[0076] With this configuration, at least one of the flow rate of the exhaust gas, the amount of carbon dioxide contained in the exhaust gas, and the load amount of the combustion device 8, which change depending on the magnitude of the load of the combustion device 8, is acquired as information related to the load of the combustion device 8. As a result, when the load of the combustion device 8 is small, the outputs of the circulation pumps 32A, 32B can be reduced depending on the change in the magnitude of the load of the combustion device 8.

[0077] (3) The carbon dioxide capture system 10 according to a third aspect is the carbon dioxide capture system 10 of (1) or (2), and includes an exhaust gas cooling tower 11 that cools the exhaust gas introduced into the absorption tower 12 with a coolant, and a coolant supply system 102 that has a coolant supply pump 31 that supplies the coolant to the exhaust gas cooling tower 11, and the control device 60 controls the output of the coolant supply pump 31 based on information related to the load of the combustion device 8.

[0078] According to this configuration, the output of the coolant supply pump 31 is controlled based on information related to the load on the combustion device 8. As a result, when the load on the combustion device 8 is small, the output of the coolant supply pump 31 can be reduced. As a result, the energy consumption in the carbon dioxide capture system 10 can be reduced.

[0079] (4) A fourth aspect of the carbon dioxide capture system 10 is the carbon dioxide capture system 10 of (3), wherein the information acquisition unit 71 acquires at least one of the following information related to the load on the combustion device 8: the inlet temperature of the exhaust gas at the exhaust gas cooling tower 11, the outlet temperature of the exhaust gas at the exhaust gas cooling tower 11, the concentration of soot contained in the exhaust gas, the flow rate of the exhaust gas discharged from the combustion device 8, and the load amount of the combustion device 8; and the control device 60 controls the output of the coolant supply pump 31 based on at least one of the inlet temperature of the exhaust gas, the outlet temperature of the exhaust gas, the concentration of soot, the flow rate of the exhaust gas discharged from the combustion device 8, and the load amount of the combustion device 8 acquired by the information acquisition unit 71.

[0080] According to this configuration, at least one of the exhaust gas inlet temperature, exhaust gas outlet temperature, soot concentration, flow rate of exhaust gas discharged from the combustion device 8, and load amount of the combustion device 8, which change depending on the magnitude of the load of the combustion device 8, is acquired as information related to the load of the combustion device 8. As a result, in accordance with changes in the magnitude of the load of the combustion device 8, when the load of the combustion device 8 is small, the output of the coolant supply pump 31 can be reduced.

[0081] (5) A carbon dioxide capture system 10 according to a fifth aspect is any one of the carbon dioxide capture systems 10 of (1) to (4), further comprising an absorption liquid heating system 108 that heats the absorption liquid in the regeneration tower 13 with steam supplied from the outside, and a steam supply amount adjustment unit 80 that adjusts the amount of steam supplied to the absorption liquid heating system 108, and the control device 60 controls the amount of steam supplied to the absorption liquid heating system 108 by the steam supply amount adjustment unit 80 based on information related to the load of the combustion device 8.

[0082] According to this configuration, the steam supply amount adjusting unit 80 controls the amount of steam supplied to the absorption liquid heating system 108 based on information related to the load on the combustion device 8. As a result, when the load on the combustion device 8 is small, the amount of steam supplied to the absorption liquid heating system 108 can be reduced. Therefore, the amount of steam generated externally to be supplied to the absorption liquid heating system 108 can be reduced. As a result, the energy consumption in the carbon dioxide capture system 10 can be reduced.

[0083] (6) A carbon dioxide capture system 10 according to a sixth aspect is the carbon dioxide capture system 10 of (5), wherein the information acquisition unit 71 acquires at least one of the following information related to the load on the combustion device 8: the circulation flow rate of the absorption liquid in the circulation system 106, the flow rate of the exhaust gas discharged from the combustion device 8, the amount of carbon dioxide contained in the exhaust gas, and the load on the combustion device 8; and the control device 60 controls the amount of steam supplied to the absorption liquid heating system 108 based on at least one of the circulation flow rate of the absorption liquid, the flow rate of the exhaust gas discharged from the combustion device 8, the amount of carbon dioxide contained in the exhaust gas, and the load on the combustion device 8 acquired by the information acquisition unit 71.

[0084] With this configuration, at least one of the following information related to the load on the combustion device 8 is acquired: the circulation flow rate of the absorption liquid in the circulation system 106, the flow rate of the exhaust gas discharged from the combustion device 8, and the load on the combustion device 8, which change depending on the magnitude of the load on the combustion device 8. As a result, when the load on the combustion device 8 is small, the amount of steam supplied to the absorption liquid heating system 108 can be reduced depending on the change in the magnitude of the load on the combustion device 8.

[0085] (7) A carbon dioxide capture system 10 according to a seventh aspect is any one of the carbon dioxide capture systems 10 of (1) to (6), and includes an exhaust gas scrubbing unit 14 that scrubs the absorbing liquid contained in the exhaust gas by bringing a scrubbing liquid into contact with the exhaust gas in which carbon dioxide has been absorbed by the absorbing liquid of the absorption tower 12, and a scrubbing liquid supply system 105 that has a scrubbing liquid supply pump 33 that supplies the scrubbing liquid to the exhaust gas scrubbing unit 14, and the control device 60 controls the output of the scrubbing liquid supply pump 33 based on information related to the load of the combustion device 8.

[0086] According to this configuration, the output of the cleaning liquid supply pump 33 is controlled based on information related to the load on the combustion device 8. As a result, when the load on the combustion device 8 is small, the output of the cleaning liquid supply pump 33 can be reduced. As a result, the energy consumption in the carbon dioxide capture system 10 can be reduced.

[0087] (8) The carbon dioxide capture system 10 according to the eighth aspect is the carbon dioxide capture system 10 of (7), wherein the information acquisition unit 71 acquires at least one of the following information related to the load on the combustion device 8: the circulation flow rate of the absorption liquid in the circulation system 106, the flow rate of the exhaust gas discharged from the combustion device 8, the amount of carbon dioxide contained in the exhaust gas, and the load on the combustion device 8; and the control device 60 controls the output of the cleaning liquid supply pump 33 based on at least one of the circulation flow rate of the absorption liquid, the flow rate of the exhaust gas discharged from the combustion device 8, the amount of carbon dioxide contained in the exhaust gas, and the load on the combustion device 8 acquired by the information acquisition unit 71.

[0088] According to this configuration, at least one of the following information is acquired as information related to the load on the combustion device 8: the circulation flow rate of the absorption liquid in the circulation system 106, the flow rate of the exhaust gas discharged from the combustion device 8, the amount of carbon dioxide contained in the exhaust gas, and the load on the combustion device 8, which change depending on the magnitude of the load on the combustion device 8. As a result, when the load on the combustion device 8 is small, the output of the cleaning liquid supply pump 33 can be reduced depending on the change in the magnitude of the load on the combustion device 8.

[0089] (9) A carbon dioxide capture system 10 according to a ninth aspect is a carbon dioxide capture system 10 provided on a floating body 1, and includes an absorption tower 12 into which exhaust gas from a combustion device 8 that combusts fuel and an absorption liquid capable of absorbing carbon dioxide in the exhaust gas are introduced, and which absorbs the carbon dioxide in the exhaust gas with the absorption liquid; a regeneration tower 13 that heats the absorption liquid that has absorbed the carbon dioxide and separates the carbon dioxide from the absorption liquid; a capture unit 15 that captures the carbon dioxide separated in the regeneration tower 13; and a carbon dioxide capture unit 16 that captures the carbon dioxide before the carbon dioxide is absorbed by the absorption liquid in the absorption tower 12. The carbon dioxide capture system 10 includes an exhaust gas scrubbing unit 14 that brings a scrubbing liquid into contact with the exhaust gas to scrub the absorbing liquid contained in the exhaust gas, a scrubbing liquid supply system 105 that has a scrubbing liquid supply pump 33 that supplies the scrubbing liquid to the exhaust gas scrubbing unit 14, an information acquisition unit 71 that acquires information related to the load on the combustion device 8, and a control device 60 that controls the output of the scrubbing liquid supply pump 33 based on the information related to the load on the combustion device 8, and the control device 60 controls the output of the scrubbing liquid supply pump 33 based on the information related to the load on the combustion device 8. As a result, when the load on the combustion device 8 is small, the output of the scrubbing liquid supply pump 33 can be reduced. As a result, energy consumption in the carbon dioxide capture system 10 can be reduced.

[0090] (10) A carbon dioxide capture system 10 according to a tenth aspect is the carbon dioxide capture system of (9), comprising: an exhaust gas cooling tower 11 that cools the exhaust gas introduced into the absorption tower 12 with a coolant; and a coolant supply system 102 having a coolant supply pump 31 that supplies the coolant to the exhaust gas cooling tower 11, wherein the control device 60 controls the output of the coolant supply pump 31 based on information related to the load on the combustion device 8. As a result, when the load on the combustion device 8 is small, it is possible to reduce both the output of the cleaning liquid supply pump 33 and the output of the coolant supply pump 31. As a result, it is possible to reduce energy consumption in the carbon dioxide capture system 10.

[0091] (11) A carbon dioxide capture system 10 according to an eleventh aspect is a carbon dioxide capture system 10 provided on a floating body 1, and includes: an absorption tower 12 into which exhaust gas from a combustion device 8 that combusts fuel and an absorption liquid capable of absorbing carbon dioxide in the exhaust gas are introduced, and which absorbs the carbon dioxide in the exhaust gas with the absorption liquid; a regeneration tower 13 that heats the absorption liquid that has absorbed the carbon dioxide and separates the carbon dioxide from the absorption liquid; a capture unit 15 that captures the carbon dioxide separated in the regeneration tower 13; an exhaust gas cooling tower 11 that cools the exhaust gas introduced into the absorption tower 12 with a cooling liquid; a coolant supply system 102 having a coolant supply pump 31 that supplies the coolant to the exhaust gas cooling tower 11; an information acquisition unit 71 that acquires information related to the load of the combustion device 8; and a control device 60 that controls the output of the coolant supply pump 31 based on the information related to the load of the combustion device 8. This allows the output of the coolant supply pump 31 to be reduced when the load on the combustion device 8 is small, thereby reducing the energy consumption in the carbon dioxide capture system 10.

[0092] The carbon dioxide capture system of the present disclosure can reduce energy consumption.

[0093] DESCRIPTION OF SYMBOLS 1 Floating body 2 Floating body main body 2a Bow 4 Superstructure 5A, 5B Ship side 6 Ship bottom 7 Upper deck 8 Combustion device 10 Carbon dioxide capture system 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 (exhaust gas scrubbing section) 14a Tower main body 15 Capture section 16 Regeneration reflux tower 18 Reboiler 19 Condenser 21 Blower 31 Cooling liquid supply pump 32A First circulation pump (circulation pump) 32B Second circulation pump (circulation pump) 33 Cleaning liquid supply pump 41, 43 Heat exchanger 60 Control device 61 CPU 62 ROM 63 RAM 64 Storage 65 Signal transmission / reception module 70 Signal input unit 71 Information acquisition unit 72 Adjustment control unit 75 Output unit 80 Steam supply amount adjustment unit 101 Exhaust gas introduction pipe 102 Cooling liquid supply system 103 Exhaust gas discharge pipe 104 Gas discharge pipe 105 Cleaning liquid supply system 106 Circulation system 106A Absorbing liquid supply system 106B Absorbing liquid discharge system 106C Heat exchanger 107 Exhaust pipe 108 Absorbing liquid heating system 109 Gaseous carbon dioxide discharge line 110 Reflux line 81 Steam supply pipe 111 Carbon dioxide discharge pipe 201 Exhaust gas flow rate sensor 202 Exhaust gas temperature sensor 203 Absorbing liquid circulation flow rate sensor FA Bow-stern direction

Claims

1. A carbon dioxide capture system installed on a floating body, comprising: an absorption tower into which exhaust gas from a combustion device that combusts fuel and an absorption liquid capable of absorbing carbon dioxide in the exhaust gas are introduced, and which absorbs the carbon dioxide in the exhaust gas with the absorption liquid; a regeneration tower that heats the absorption liquid that has absorbed the carbon dioxide and separates the carbon dioxide from the absorption liquid; a circulation system having a circulation pump that circulates the absorption liquid between the absorption tower and the regeneration tower; a capture unit that captures the carbon dioxide separated in the regeneration tower; an information acquisition unit that acquires information related to the load of the combustion device; and a control device that controls the output of the circulation pump based on the information related to the load of the combustion device.

2. The carbon dioxide capture system according to claim 1, wherein the information acquisition unit acquires at least one of the following information related to the load of the combustion device: the flow rate of the exhaust gas introduced into the absorption tower, the amount of carbon dioxide contained in the exhaust gas, and the load of the combustion device.

3. A carbon dioxide capture system as described in claim 1, comprising: an exhaust gas cooling tower that cools the exhaust gas introduced into the absorption tower with a cooling liquid; and a cooling liquid supply system having a cooling liquid supply pump that supplies the cooling liquid to the exhaust gas cooling tower, wherein the control device controls the output of the cooling liquid supply pump based on information related to the load of the combustion device.

4. The carbon dioxide capture system of claim 3, wherein the information acquisition unit acquires at least one of the following information related to the load on the combustion device: the inlet temperature of the exhaust gas at the exhaust gas cooling tower; the outlet temperature of the exhaust gas at the exhaust gas cooling tower; the concentration of soot contained in the exhaust gas; the flow rate of the exhaust gas discharged from the combustion device; and the load on the combustion device; and the control device controls the output of the coolant supply pump based on at least one of the inlet temperature of the exhaust gas, the outlet temperature of the exhaust gas, the concentration of soot, the flow rate of the exhaust gas discharged from the combustion device, and the load on the combustion device acquired by the information acquisition unit.

5. A carbon dioxide recovery system as described in claim 1, further comprising: an absorption liquid heating system that heats the absorption liquid in the regeneration tower with steam supplied from outside; and a steam supply amount adjustment unit that adjusts the amount of steam supplied to the absorption liquid heating system, wherein the control device controls the amount of steam supplied to the absorption liquid heating system by the steam supply amount adjustment unit based on information related to the load of the combustion device.

6. The carbon dioxide capture system described in claim 5, wherein the information acquisition unit acquires at least one of the following information related to the load on the combustion device: the circulation flow rate of the absorption liquid in the circulation system, the flow rate of the exhaust gas discharged from the combustion device, the amount of carbon dioxide contained in the exhaust gas, and the load on the combustion device; and the control device controls the amount of steam supplied to the absorption liquid heating system by the steam supply amount adjustment unit based on at least one of the circulation flow rate of the absorption liquid, the flow rate of the exhaust gas discharged from the combustion device, the amount of carbon dioxide contained in the exhaust gas, and the load on the combustion device acquired by the information acquisition unit.

7. A carbon dioxide capture system as described in claim 1, comprising: an exhaust gas scrubbing unit that scrubs the absorbing solution contained in the exhaust gas by bringing a scrubbing solution into contact with the exhaust gas in which carbon dioxide has been absorbed by the absorbing solution in the absorption tower; and a scrubbing solution supply system having a scrubbing solution supply pump that supplies the scrubbing solution to the exhaust gas scrubbing unit, wherein the control device controls the output of the scrubbing solution supply pump based on information related to the load of the combustion device.

8. The carbon dioxide capture system of claim 7, wherein the information acquisition unit acquires at least one of the following information related to the load on the combustion device: the circulation flow rate of the absorption liquid in the circulation system, the flow rate of the exhaust gas discharged from the combustion device, the amount of carbon dioxide contained in the exhaust gas, and the load on the combustion device; and the control device controls the output of the cleaning liquid supply pump based on at least one of the circulation flow rate of the absorption liquid, the flow rate of the exhaust gas discharged from the combustion device, the amount of carbon dioxide contained in the exhaust gas, and the load on the combustion device acquired by the information acquisition unit.

9. A carbon dioxide capture system installed on a floating body, comprising: an absorption tower into which exhaust gas from a combustion device that burns fuel and an absorption liquid capable of absorbing carbon dioxide in the exhaust gas are introduced, and which absorbs the carbon dioxide in the exhaust gas with the absorption liquid; a regeneration tower that heats the absorption liquid that has absorbed the carbon dioxide and separates the carbon dioxide from the absorption liquid; a capture unit that recovers the carbon dioxide separated in the regeneration tower; an exhaust gas scrubbing unit that scrubs the absorption liquid contained in the exhaust gas by bringing a scrubbing liquid into contact with the exhaust gas in which carbon dioxide has been absorbed by the absorption liquid in the absorption tower; a cleaning liquid supply system having a cleaning liquid supply pump that supplies the cleaning liquid to the exhaust gas scrubbing unit; an information acquisition unit that acquires information related to the load of the combustion device; and a control device that controls the output of the cleaning liquid supply pump based on the information related to the load of the combustion device, wherein the control device controls the output of the cleaning liquid supply pump based on the information related to the load of the combustion device.

10. A carbon dioxide capture system as described in claim 9, comprising: an exhaust gas cooling tower that cools the exhaust gas introduced into the absorption tower with a cooling liquid; and a cooling liquid supply system having a cooling liquid supply pump that supplies the cooling liquid to the exhaust gas cooling tower, wherein the control device controls the output of the cooling liquid supply pump based on information related to the load of the combustion device.

11. A carbon dioxide capture system installed on a floating body, comprising: an absorption tower into which exhaust gas from a combustion device that burns fuel and an absorption liquid capable of absorbing carbon dioxide in the exhaust gas are introduced, and which absorbs the carbon dioxide in the exhaust gas with the absorption liquid; a regeneration tower that heats the absorption liquid that has absorbed the carbon dioxide and separates the carbon dioxide from the absorption liquid; a capture unit that recovers the carbon dioxide separated in the regeneration tower; an exhaust gas cooling tower that cools the exhaust gas introduced into the absorption tower with a cooling liquid; a coolant supply system having a coolant supply pump that supplies the coolant to the exhaust gas cooling tower; an information acquisition unit that acquires information related to the load of the combustion device; and a control device that controls the output of the coolant supply pump based on the information related to the load of the combustion device, wherein the control device controls the output of the coolant supply pump based on the information related to the load of the combustion device.

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