Floating body

Abstract

To provide a floating body capable of preventing workers from coming into contact with ammonia without submerging equipment in a compartment.SOLUTION: A floating body comprises a float body, a compartment provided in the float body and a housing ammonia related equipment inside, a duct connected to the compartment and communicating between the inside and the outside of the compartment, an exhaust fan to discharge the air inside the compartment to the outside of the compartment via the duct, an absorbent supply line to supply the absorbent capable of absorbing the ammonia, an ammonia removal part, and an absorbent discharge line to discharge the absorbent absorbing the ammonia at least in the ammonia removal part into the surrounding water where the float body floats, where the ammonia removal part is placed outside the compartment and can remove the ammonia included in the air discharged by the exhaust fan via the duct by absorbing it into the absorbent supplied from the absorbent supply line.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to floating bodies. [Background technology]

[0002] Momentum regarding decarbonized fuels is gaining internationally, and the introduction of ammonia co-firing boilers at coal-fired power plants is being considered. The use of ammonia as a fuel for the main engine of floating structures is also being considered. For example, when ammonia is transported as fuel for a power plant or when ammonia is used as fuel for the main engine, there is a possibility of ammonia leaking in a compartment such as an equipment room that houses equipment that handles ammonia. If such an ammonia leak occurs, it is expected that the leaked ammonia will vaporize and leak outside the compartment. On the other hand, in the case of an equipment room such as the one described above, if an attempt is made to remove the ammonia by spraying water, there is a possibility that the equipment housed in the equipment room will be flooded. In Patent Document 1, a sealed duct is provided that communicates with the compartment, water is sprayed inside the duct, and ammonia is absorbed into the water inside the duct, creating negative pressure inside the compartment, thereby preventing ammonia from leaking outside the compartment. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 4356939 Summary of the Invention [Problem to be solved by the invention]

[0004] The ammonia removal method described in Patent Document 1 prevents ammonia from leaking outside the compartment, but ammonia remains within the compartment. Therefore, if a worker enters the compartment where ammonia has leaked, there is a possibility that the worker will come into contact with the ammonia that has leaked into the compartment. The present disclosure has been made to solve the above-mentioned problems, and aims to provide a float that can prevent workers from coming into contact with ammonia without flooding equipment within the compartment. [Means for solving the problem]

[0005] In order to solve the above problems, the following configuration is adopted. A float according to the present disclosure includes a float body, a compartment provided in the float body and accommodating ammonia-related equipment therein, a duct connected to the compartment and communicating the inside of the compartment with the outside of the compartment, an exhaust fan that discharges air inside the compartment to the outside of the compartment via the duct, an absorbing liquid supply line that supplies an absorbing liquid capable of absorbing ammonia, an ammonia removal unit that is arranged outside the compartment and is capable of removing ammonia contained in the air discharged by the exhaust fan through the duct by causing the absorbing liquid supplied by the absorbing liquid supply line to absorb the ammonia, and an absorbing liquid discharge line that discharges the absorbing liquid that has absorbed the ammonia at least in the ammonia removal unit into the surrounding water in which the float body floats. a control device comprising an in-compartment sensor capable of detecting ammonia contained in the air inside the compartment, and a discharge line sensor capable of detecting ammonia contained in the fluid flowing through the absorption liquid discharge line, the control device determining whether or not an ammonia leak has occurred based on the detection result of the in-compartment sensor, and operating the exhaust fan when it is determined that an ammonia leak has occurred, and adjusting the air volume of the exhaust fan based on the detection result of the discharge line sensor. Equipped with. [Effects of the Invention]

[0006] According to the floating body of the above aspect, it is possible to prevent workers from coming into contact with ammonia without flooding the equipment in the compartment. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a side view of a floating body according to a first embodiment of the present disclosure. [Figure 2] 1 is a diagram showing a schematic configuration of an ammonia removal system according to a first embodiment of the present disclosure. FIG. [Figure 3] FIG. 2 is a block diagram showing a schematic configuration of a control device according to the first embodiment of the present disclosure. [Figure 4] FIG. 2 is a functional block diagram of the control device. [Figure 5] 3 is a flowchart of an ammonia removal process in the first embodiment of the present disclosure. [Figure 6] FIG. 10 is a diagram corresponding to FIG. 2 according to a second embodiment of the present disclosure. [Figure 7] FIG. 2 is a functional block diagram of the control device. [Figure 8] FIG. 10 is a view corresponding to FIG. 2 according to a third embodiment of the present disclosure. [Figure 9] FIG. 2 is a functional block diagram of the control device. [Figure 10] 1 is a flowchart of an ammonia removal process according to an embodiment of the present disclosure. [Figure 11] FIG. 10 is a view corresponding to FIG. 2 according to a fourth embodiment of the present disclosure. [Figure 12] FIG. 2 is a functional block diagram of the control device. [Figure 13] 3 is a flowchart of an ammonia removal process in the first embodiment of the present disclosure. [Figure 14] FIG. 10 is a view corresponding to FIG. 2 in a first modified example of each embodiment of the present disclosure. [Figure 15] FIG. 10 is an enlarged view of a scrubber in a second modified example of each embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0008] [First embodiment] A floating body according to a first embodiment of the present disclosure will now be described with reference to the drawings, in which: Fig. 1 is a side view of the floating body according to the first embodiment of the present disclosure. (Floating structure) As shown in Fig. 1, a float 1 of this embodiment includes a float main body 2, a superstructure 4, a combustion device 8, an ammonia tank 10, a piping system 20, a compartment 30, and an ammonia removal system 40. The float 1 of this embodiment will be described as an example of a ship that can navigate using a main engine or the like. The type of ship that the float 1 is used for is not limited to a specific type of ship. Examples of the type of ship that the float 1 can be used for include a liquefied gas carrier, a ferry, a roll-on / roll-off ship, a car carrier, and a passenger ship.

[0009] 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.

[0010] The floating body main body 2 further comprises an upper deck 7, which is a full-length deck located at the topmost level. The superstructure 4 is formed on this 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 3a in the bow-stern direction FA than the superstructure 4.

[0011] 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. The combustion device 8 of this embodiment uses ammonia (hereinafter referred to as fuel ammonia) as fuel.

[0012] The ammonia tank 10 stores liquefied ammonia as fuel ammonia. The ammonia tank 10 is installed on the upper deck 7 on the stern 3b side of the superstructure 4. Note that the above-mentioned arrangement of the ammonia tank 10 is an example, and is not limited to being on the upper deck 7 on the stern 3b side of the superstructure 4.

[0013] The piping system 20 connects the combustion device 8 and the ammonia tank 10 .

[0014] The compartment 30 is a compartment that houses ammonia-related equipment. In this embodiment, the compartment 30 is provided on the upper deck 7, closer to the bow 3a than the superstructure 4. The above-mentioned piping system 20 connects the combustion device 8 and the ammonia tank 10 through this compartment 30. Here, the ammonia-related equipment refers to all equipment that handles ammonia, and examples thereof include ammonia fuel equipment that handles ammonia as fuel and ammonia cargo equipment that handles ammonia as cargo. In the following explanation, the compartment 30 that houses ammonia fuel equipment will be described, but the compartment 30 may also be a compartment that houses ammonia cargo equipment.

[0015] The compartment 30 in this embodiment is a fuel supply device chamber, and houses an ammonia fuel device that constitutes part of the piping system 20. Examples of the ammonia fuel device housed in the fuel supply device chamber include a pump that pressure-feeds ammonia from the ammonia tank 10 to the combustion device 8, a heater for heating the ammonia sent to the combustion device 8, an electric valve, and the like. Note that the compartment 30 housing the ammonia fuel device is not limited to the ammonia fuel supply device chamber. The compartment 30 housing the ammonia fuel device may be, for example, an ammonia fuel pressure regulating valve chamber, an ammonia fuel intake chamber (in other words, a bunker station), or the like.

[0016] (Configuration of ammonia removal system) FIG. 2 is a diagram showing a schematic configuration of an ammonia removal system according to the first embodiment of the present disclosure. As shown in FIG. 2, the ammonia removal system 40 of this embodiment includes a duct 41, an exhaust fan 42, an absorption liquid supply line 43, a scrubber (ammonia removal section) 44, an absorption liquid discharge line 45, an in-compartment sensor 46, a discharge line sensor 47, and a control device 48.

[0017] The duct 41 is connected to the compartment 30. The duct 41 connects the interior of the compartment 30 to the exterior of the compartment 30. The duct 41 of this embodiment has a first end 41a connected to the compartment 30 and a second end 41b connected to the scrubber 44, and connects the interior space of the compartment 30 to the interior space of the scrubber 44. In other words, the duct 41 forms a flow path that guides the air in the compartment 30 that has flowed in from the first end 41a into the scrubber 44 from the second end 41b. The duct 41 of this embodiment is configured so that air does not flow out from any end other than the first end 41a and the second end 41b.

[0018] The exhaust fan 42 exhausts air inside the compartment 30 to the outside of the compartment 30 through the duct 41. The exhaust fan 42 of this embodiment blows air from the first end 41a toward the second end 41b of the duct 41, thereby exhausting the air inside the compartment 30 to a scrubber 44 located outside the compartment 30. The exhaust fan 42 is provided in the duct 41. The exhaust fan 42 of this embodiment is a variable speed fan that can adjust the air volume, and is controlled by a control device 48 described later. Note that, although the exhaust fan 42 of this embodiment is provided in the duct 41 near the first end 41a, the arrangement of the exhaust fan 42 is not limited to the above arrangement.

[0019] The absorbing liquid supply line 43 supplies an absorbing liquid capable of absorbing ammonia. Examples of the absorbing liquid include seawater, fresh water, and seawater or fresh water that has been treated to make it acidic. The absorbing liquid supply line 43 is equipped with a pump 49 for pumping the absorbing liquid. The absorbing liquid supply line 43 of this embodiment supplies water (e.g., seawater) around the floating body 2 as the absorbing liquid.

[0020] The scrubber 44 is disposed outside the compartment 30. In this embodiment, the case where the scrubber is disposed near the compartment 30 is shown. The scrubber 44 is configured to be able to remove ammonia contained in the air discharged by the exhaust fan 42 through the duct 41 by having the ammonia absorbed in an absorbing solution supplied through the absorbing solution supply line 43. In other words, when the air inside the compartment 30 contains vaporized ammonia, the scrubber 44 removes the ammonia from the ammonia-containing air sent through the duct 41.

[0021] The scrubber 44 has a nozzle unit 50 that sprays the absorbing liquid. This nozzle unit 50 is disposed in the upper part of the internal space of the scrubber 44. The absorbing liquid sprayed from the nozzle unit 50 moves downward due to its own weight and comes into contact with the air supplied to the scrubber 44 via the duct 41. Through this contact, the ammonia contained in the air is absorbed into the absorbing liquid and stored in the lower part of the scrubber 44.

[0022] Here, the second end 41b of the duct 41 described above is connected to the scrubber 44 below the nozzle unit 50. The position of the second end 41b in the up-down direction may be below the liquid level of the absorption liquid stored in the lower part of the internal space. By connecting the second end 41b at such a position, the air flowing from the duct 41 into the scrubber 44 is released as bubbles into the stored absorption liquid. Therefore, the ammonia contained in the air is absorbed into the absorption liquid stored in the lower part of the internal space of the scrubber 44. Then, when the air bubbles released into the absorption liquid move upward and reach the liquid surface and are released into the gas phase, they come into contact with the absorption liquid sprayed by the nozzle unit 50, and the remaining ammonia contained in the air is absorbed.

[0023] The absorbing liquid discharge line 45 discharges the absorbing liquid that has absorbed ammonia in the scrubber 44 into the surrounding water in which the floating body 2 floats. The absorbing liquid discharge line 45 in this embodiment has a first end 45a connected to the scrubber 44 and a second end 45b connected to the ship's sides 5A, 5B or the bottom 6 of the floating body 2 below the light draft line. 45bThe first end of the absorption liquid discharge line 45 45a is connected to the lowest of the scrubbers 44. In this embodiment, the internal pressure of the scrubber 44 is increased by the air blown by the exhaust fan 42. Therefore, in this embodiment, this pressure is utilized to discharge the absorbing liquid that has absorbed ammonia and is stored in the lower part of the scrubber 44 into the water outside the floating body body 2 via the absorbing liquid discharge line 45. Here, it is not limited to the absorbing liquid stored in the lower part of the scrubber 44 that is discharged into the water outside the floating body body 2 via the absorbing liquid discharge line 45. For example, together with the absorbing liquid in the scrubber 44, the air in the scrubber 44 is also discharged into the water outside the floating body body 2 via the absorbing liquid discharge line 45.

[0024] The scrubber 44 of the present embodiment includes an atmosphere release line 57 and an open / close damper 58. The atmosphere release line 57 is connected to, for example, a vent pipe (not shown) provided on the floating body main body 2, and is configured to be able to release air that has flowed into the scrubber 44 via the duct 41 to the atmosphere. The open / close damper 58 opens and closes the atmosphere release line 57. The open / close damper 58 of the scrubber 44 in the first embodiment is normally closed. This open / close damper 58 can be opened, for example, when a ventilation exhaust fan 56 (described later) cannot be used due to maintenance or the like. In this way, when the ventilation exhaust fan 56 cannot be used, the compartment 30 can be ventilated using the atmosphere release line 57 instead of the ventilation exhaust duct 54.

[0025] The intra-compartment sensor 46 detects the ammonia (specifically, the concentration of ammonia) contained in the air inside the compartment 30. The intra-compartment sensor 46 of this embodiment outputs information on the detection result to the control device 48. The discharge line sensor 47 detects ammonia (specifically, the concentration of ammonia) contained in the fluid flowing through the absorbent discharge line 45. Similar to the intra-compartment sensor 46, the discharge line sensor 47 of this embodiment outputs information on the detection result to the control device 48. Note that, in order to notify the operator of the detected ammonia concentration, a display device such as a display may be provided to display the detection result of the intra-compartment sensor 46 and the detection result of the discharge line sensor 47.

[0026] As shown in FIG. 2 , a ventilation air supply duct 53 and a ventilation exhaust duct 54 for ventilating the compartment 30 are connected to the compartment 30 of the first embodiment. Furthermore, a ventilation air supply damper 55 is attached to the ventilation air supply duct 53, and a ventilation exhaust fan 56 and a ventilation exhaust damper 59 are attached to the ventilation exhaust duct 54. The ventilation air supply duct 53 and the ventilation exhaust duct 54 both communicate between the interior of the compartment 30 and the outside of the floating body main body 2. The ventilation air supply damper 55 adjusts the flow rate of air flowing through the ventilation air supply duct 53. The ventilation air supply duct 53 in this embodiment is controlled by the control device 48. The ventilation exhaust fan 56 sends out air from the compartment 30 through the ventilation exhaust duct 54 and the ventilation exhaust damper 59. The ventilation exhaust damper 59 adjusts the flow rate of fluid (gas) flowing through the ventilation exhaust duct 54. In this embodiment, ventilation air supply duct 53 is located on the opposite side of the lower part of compartment 30 (in other words, at a position that is vertically symmetrical) to the position of first end 41a of duct 41 connected to the ceiling of compartment 30. This allows air within compartment 30 to be efficiently discharged to the outside of compartment 30 through duct 41. In addition, if the air flow through ventilation exhaust duct 54 cannot be stopped simply by stopping ventilation exhaust fan 56, a ventilation exhaust damper (not shown) that opens and closes ventilation exhaust duct 54 may be provided so that ventilation exhaust duct 54 is closed when ventilation exhaust fan 56 is stopped.

[0027] (Control device configuration) The control device 48 controls the ammonia removal system 40. More specifically, the control device 48 determines whether an ammonia leak has occurred based on the detection result of the in-compartment sensor 46. If the control device 48 determines that an ammonia leak has occurred, the control device 48 activates the exhaust fan 42. On the other hand, if the control device 48 determines that an ammonia leak has not occurred, the control device 48 stops the exhaust fan 42. Furthermore, if the control device 48 determines that an ammonia leak has occurred in the compartment 30 based on the detection result of the in-compartment sensor 46, the control device 48 activates the exhaust fan 42 and adjusts the airflow rate of the exhaust fan 42 based on the detection result of the discharge line sensor 47. Furthermore, if the control device 48 determines that an ammonia leak has not occurred in the compartment 30, the control device 48 of this embodiment stops the pump 49 and stops the supply of absorbing solution through the absorbing solution supply line 43. On the other hand, if the control device 48 determines that an ammonia leak has occurred in the compartment 30, the control device 48 drives the pump 49 to supply absorbing solution to the scrubber 44 through the absorbing solution supply line 43.

[0028] (Control device hardware configuration diagram) FIG. 3 is a block diagram showing a schematic configuration of a control device according to the first embodiment of the present disclosure. 3, the control device 48 is a computer including a CPU 61 (Central Processing Unit), a ROM 62 (Read Only Memory), a RAM 63 (Random Access Memory), an HDD 64 (Hard Disk Drive), and a signal transmission / reception module 65. The signal transmission / reception module 65 receives detection signals from the intra-compartment sensor 46 and the discharge line sensor 47. The signal transmission / reception module 65 also transmits control signals to control the exhaust fan 42, the pump 49, etc.

[0029] (Controller function block diagram) FIG. 4 is a functional block diagram of the control device. The CPU 61 of the control device 48 executes a program previously stored in the HDD 64, ROM 62, etc., thereby realizing the functional configurations of a signal receiving unit 71, an exhaust fan control unit 72, a pump control unit 73, a ventilation air supply damper control unit 76, a ventilation exhaust fan control unit 77, and a command signal output unit 78.

[0030] The signal receiving unit 71 receives detection signals from the in-compartment sensor 46 and the emission line sensor 47 via the signal transmitting / receiving module 65 . The exhaust fan control unit 72 controls the activation, deactivation and airflow rate of the exhaust fan 42 based on the detection signal from the in-compartment sensor 46 and the detection signal from the discharge line sensor 47 received by the signal receiving unit 71 . The pump control unit 73 controls the operation and stopping of the pump 49 based on detection signals from one or both of the in-compartment sensor 46 and the discharge line sensor 47. The pump 49 may be stopped manually by an operator.

[0031] The ventilation air supply damper control unit 76 controls the opening degree of the ventilation air supply damper 55 based on the detection signal from the intra-compartment sensor 46. Specifically, when it is determined that an ammonia leak has occurred in the compartment 30, the ventilation air supply damper control unit 76 controls the opening degree of the ventilation air supply damper 55 so that the pressure inside the compartment 30 is maintained at a negative pressure. The ventilation exhaust fan control unit 77 controls the operation and stopping of the ventilation exhaust fan 56 based on the detection signal of the intra-compartment sensor 46. The ventilation exhaust damper control unit 75 controls the opening degree (e.g., opening / closing) of the ventilation exhaust damper 59 based on the detection signal of the intra-compartment sensor 46.

[0032] The command signal output unit 78 outputs a command signal to each of the exhaust fan 42, pump 49, ventilation air supply damper 55, and ventilation exhaust fan 56 to realize each control by the exhaust fan control unit 72, pump control unit 73, ventilation air supply damper control unit 76, and ventilation exhaust fan control unit 77.

[0033] (Control device operation) FIG. 5 is a flowchart of the ammonia removal process in the first embodiment of the present disclosure. Next, the operation of the control device 48 when removing ammonia from the compartment 30 of the floating body 1 will be described with reference to the flowchart of FIG. First, the exhaust fan control unit 72 and the pump control unit 73 of the control device 48 determine whether the ammonia concentration in the compartment 30 is equal to or greater than a predetermined first threshold based on the detection result of the intra-compartment sensor 46 (step S01). If it is determined that the ammonia concentration in the compartment 30 is not equal to or greater than the first threshold, there is no ammonia leakage in the compartment 30, and the exhaust fan 42 and the pump 49 are stopped (step S05). On the other hand, if it is determined that the ammonia concentration in the compartment 30 is equal to or greater than the first threshold, there is an ammonia leakage in the compartment 30, and the exhaust fan control unit 72 starts operation of the exhaust fan 42, and the pump control unit 73 starts operation of the pump 49 (step S02). As a result, the air and the absorbing liquid in the compartment 30 are each supplied to the scrubber 44, and the ammonia in the air is absorbed by the absorbing liquid. In this embodiment, if it is determined that the ammonia concentration in section 30 is equal to or greater than the first threshold, ventilation exhaust fan 56 is stopped, ventilation exhaust damper 59 is closed, and the opening of ventilation intake damper 55 is adjusted so that a predetermined negative pressure is maintained within section 30.

[0034] Next, the exhaust fan control unit 72 of the control device 48 determines whether the ammonia concentration of the absorbing solution flowing through the absorbing solution discharge line 45 is equal to or greater than a second threshold value based on the detection result of the discharge line sensor 47 (step S03). This determination determines whether the ammonia concentration of the absorbing solution discharged to the outside of the floating body 2 through the absorbing solution discharge line 45 satisfies, for example, regulations regarding ocean discharge. If this determination results in the determination that the ammonia concentration of the absorbing solution flowing through the absorbing solution discharge line 45 is not equal to or greater than the second threshold value, the process returns to step S01 (return). On the other hand, if the ammonia concentration of the absorbing solution flowing through the absorbing solution discharge line 45 is equal to or greater than the second threshold value, the process reduces the airflow rate of the exhaust fan 42 by a predetermined amount, and then returns to step S03. That is, the airflow rate of the exhaust fan 42 is reduced until the ammonia concentration of the absorbing solution flowing through the absorbing solution discharge line 45 becomes less than the predetermined value.

[0035] (Action and effect) The float 1 of the first embodiment described above comprises a float body 2, a compartment 30 provided in the float body 2 and accommodating ammonia-related equipment therein, a duct 41 connected to the compartment 30 and communicating the inside of the compartment 30 with the outside of the compartment 30, an exhaust fan 42 that discharges the air inside the compartment 30 to the outside of the compartment 30 via the duct 41, an absorbing liquid supply line 43 that supplies an absorbing liquid capable of absorbing ammonia, a scrubber 44 that is arranged outside the compartment 30 and is capable of removing ammonia contained in the air discharged by the exhaust fan 42 through the duct 41 by making the absorbing liquid supplied by the absorbing liquid supply line 43 absorb the ammonia, and an absorbing liquid discharge line 45 that discharges at least the absorbing liquid that has absorbed the ammonia in the scrubber 44 into the surrounding water in which the float body 2 floats. In this way, air containing ammonia that has leaked into compartment 30 and vaporized can be introduced into scrubber 44 via duct 41 to remove the ammonia. Furthermore, the absorbing liquid that has absorbed the ammonia in scrubber 44 is released into the water via absorbing liquid release line 45, which prevents the ammonia contained in the absorbing liquid from re-vaporizing and being released into the atmosphere, thereby preventing contact with workers. Furthermore, because the absorbing liquid that has absorbed ammonia does not remain inside the floating body 2, it is possible to prevent contact between the absorbing liquid that has absorbed ammonia and workers. Therefore, it is possible to prevent workers from coming into contact with ammonia without flooding the equipment in compartment 30.

[0036] The floating body 1 of the first embodiment further includes an in-compartment sensor 46 capable of detecting ammonia contained in the air inside the compartment 30. This makes it possible to detect an ammonia leak within the compartment 30 based on the detection result of the in-compartment sensor 46. Therefore, it becomes possible to operate the exhaust fan 42 to remove the ammonia only when an ammonia leak occurs within the compartment 30, thereby achieving energy savings.

[0037] The floating body 1 of the first embodiment further includes a discharge line sensor 47 capable of detecting ammonia contained in the fluid flowing through the absorbent discharge line 45. As a result, for example, if the ammonia concentration in the fluid flowing through the absorption liquid discharge line 45 is high, the flow rate of air introduced from section 30 to the scrubber 44 can be reduced so that the ammonia concentration in the fluid discharged through the absorption liquid discharge line 45 does not exceed the regulated value.

[0038] The exhaust fan 42 of the floating body 1 of the first embodiment is a variable speed fan whose air volume can be adjusted. By doing this, for example, when the concentration of ammonia contained in the fluid flowing through the absorption liquid discharge line 45 is high, the ammonia concentration of the fluid flowing through the absorption liquid discharge line 45 can be reduced by reducing the airflow rate of the exhaust fan 42 in accordance with the ammonia concentration.

[0039] The floating body 1 of the first embodiment described above is equipped with a control device 48 that determines whether or not an ammonia leak has occurred based on the detection results of the in-compartment sensor 46, and activates the exhaust fan 42 if it is determined that an ammonia leak has occurred. In this way, any ammonia leaking into the compartment 30 can be automatically removed by the control device 48 .

[0040] The control device 48 of the first embodiment further operates the exhaust fan 42 when it is determined that an ammonia leak has occurred, and adjusts the airflow rate of the exhaust fan 42 based on the detection results of the discharge line sensor 47. In this way, the control device 48 can automatically prevent the concentration of ammonia contained in the fluid flowing through the absorbent discharge line 45 from exceeding the regulated value.

[0041] The control device 48 of the first embodiment further includes a ventilation exhaust fan 56 and a ventilation exhaust damper 59 that discharge the air inside the compartment 30 to the outside of the floating body main body 2. This allows ventilation within the compartment 30 to be performed by the ventilation exhaust fan 56 when no ammonia leakage is occurring.

[0042] Second Embodiment Next, a floating body according to a second embodiment of the present disclosure will be described with reference to the drawings. This second embodiment differs from the first embodiment described above only in the method of adjusting the flow rate of air flowing through the duct 41. Therefore, in this second embodiment, the same parts as those in the first embodiment described above will be described with the same reference numerals, and duplicated explanations will be omitted.

[0043] FIG. 6 is a diagram corresponding to FIG. 2 in the second embodiment of the present disclosure. The float 1 of the second embodiment includes a float body 2, a superstructure 4, a combustion device 8, an ammonia tank 10, a piping system 20, a compartment 30, and an ammonia removal system 240.

[0044] (Configuration of ammonia removal system) As shown in FIG. 6 , the ammonia removal system 240 includes a duct 41, an exhaust fan 242, an absorption liquid supply line 43, a scrubber (ammonia removal section) 44, an absorption liquid discharge line 45, an in-compartment sensor 46, a discharge line sensor 47, a circulation duct 81, a duct damper 82, a circulation duct damper 83, and a control device 248.

[0045] The exhaust fan 242 exhausts the air inside the compartment 30 to the outside of the compartment 30 via the duct 41. The exhaust fan 242 is provided on the side of the duct 41 that is closer to the first end 41a. The exhaust fan 242 in this embodiment is a constant speed fan that maintains a constant flow rate during steady operation. The control of switching between operating and stopping the exhaust fan 242 is performed by a control device 248.

[0046] The circulation duct 81 is branched off from the duct 41 that connects the compartment 30 and the scrubber 44. The circulation duct 81 forms a flow path that returns the air flowing through the duct 41 to the compartment 30. The circulation duct 81 branches off from the duct 41 between the exhaust fan 242 and the scrubber 44.

[0047] The duct damper 82 is provided in the duct 41. The duct damper 82 is capable of adjusting the flow rate of air flowing through the duct 41. The duct damper 82 is disposed on a side closer to the scrubber 44 than the branch point P1 of the circulation duct 81. The duct damper 82 in this embodiment is controlled by the control device 248.

[0048] The circulation duct damper 83 is provided in the circulation duct 81. The circulation duct damper 83 is capable of adjusting the flow rate of air flowing through the circulation duct 81. The circulation duct damper 83 in this embodiment is controlled by the control device 248.

[0049] (Control device configuration) The control device 248 controls the ammonia removal system 240. More specifically, the control device 248 determines whether or not an ammonia leak has occurred based on the detection result of the intra-compartment sensor 46. If the control device 248 determines that an ammonia leak has not occurred, the control device 248 stops the exhaust fan 242 and does not operate it. Note that the exhaust fan 242 may be operated at all times, and in this case, if it is determined that an ammonia leak has not occurred, the control device 248 may close the duct damper 82 and open the circulation duct damper 83.

[0050] On the other hand, when it is determined that an ammonia leak has occurred, the control device 248 activates the exhaust fan 242 and the pump 49. Furthermore, the control device 248 controls the duct damper 82 and the circulation duct damper 83 based on the detection result of the discharge line sensor 47. More specifically, the control device 248 adjusts the flow rate of air flowing into the duct 41 and the flow rate of air flowing into the circulation duct 81 using the duct damper 82 and the circulation duct damper 83 based on the detection result of the discharge line sensor 47. In other words, the flow rate of air flowing into the scrubber 44 is adjusted by returning a portion of the air sent by the exhaust fan 242 to the section 30. Note that the hardware configuration of the control device 248 in this second embodiment is similar to that in the first embodiment, and therefore a detailed description thereof will be omitted.

[0051] (Controller function block diagram) FIG. 7 is a functional block diagram of the control device. The CPU 61 of the control device 248 executes a program stored in advance in the HDD 64, the ROM 62, or the like, thereby realizing the functional configurations of a signal receiving unit 71, an exhaust fan control unit 272, a pump control unit 73, a ventilation supply air damper control unit 76, a ventilation exhaust fan control unit 77, a command signal output unit 278, a duct damper control unit 79, and a circulation duct damper control unit 80. The signal receiving unit 71, the pump control unit 73, the ventilation supply air damper control unit 76, and the ventilation exhaust fan control unit 77 are the same as those of the control device 48 of the first embodiment described above.

[0052] The exhaust fan control unit 272 controls the activation and deactivation of the exhaust fan 242 based on the detection signal of the in-compartment sensor 46 and the detection signal of the discharge line sensor 47 received by the signal receiving unit 71 .

[0053] The duct damper control unit 79 controls the opening degree of the duct damper 82 based on the detection result of the discharge line sensor 47 . The circulation duct damper control unit 80 controls the opening degree of the circulation duct damper 83 according to one or both of the opening degree of the duct damper 82 by the duct damper control unit 79 and the detection results of the discharge line sensor 47. Specifically, the circulation duct damper control unit 80 controls the opening degree of the circulation duct damper 83 so that the flow rate of the air flowing through the duct 41 corresponds to the opening degree of the duct damper 82.

[0054] The command signal output unit 278 outputs command signals to each of the exhaust fan 42, pump 49, ventilation air supply damper 55, ventilation exhaust fan 56, duct damper 82, and circulation duct damper 83 to realize each control by the exhaust fan control unit 272, pump control unit 73, ventilation air supply damper control unit 76, ventilation exhaust fan control unit 77, ventilation exhaust damper control unit 75, duct damper control unit 79, and circulation duct damper control unit 80.

[0055] The operation of the control device 248 differs only in that in step S04 of the first embodiment described above, the opening degree of the duct damper 82 and the circulation duct damper 83 is changed to adjust the flow rate of air flowing into the scrubber 44 through the duct 41, and therefore a detailed explanation will be omitted.

[0056] (Action and effect) According to the float 1 of the second embodiment, as with the float 1 of the first embodiment, air containing ammonia that has leaked into the compartment 30 and vaporized can be introduced into the scrubber 44 via the duct 41 to remove the ammonia. Furthermore, the absorbing liquid that has absorbed the ammonia in the scrubber 44 is released into the water via the absorbing liquid release line 45, which prevents the ammonia contained in the absorbing liquid from re-vaporizing and being released into the atmosphere, resulting in contact with workers. Furthermore, since the absorbing liquid that has absorbed ammonia does not remain inside the float main body 2, contact between the absorbing liquid that has absorbed the ammonia and workers can be prevented. Therefore, it is possible to prevent workers from coming into contact with ammonia without flooding the equipment in the compartment 30.

[0057] The floating body 1 of the second embodiment further includes a circulation duct 81 that is branched off from the duct 41 and returns the air flowing through the duct 41 to the compartment 30, a duct damper 82 that is provided in the duct 41 and is capable of adjusting the flow rate of the air flowing in the duct 41, and a circulation duct damper 83 that is provided in the circulation duct 81 and is capable of adjusting the flow rate of the air flowing in the circulation duct 81. The exhaust fan 242 is a constant speed fan that maintains a constant flow rate. With this configuration, even when the airflow rate of the exhaust fan 242 cannot be adjusted, the flow rate of the air flowing from the duct 41 into the scrubber 44 can be changed. Therefore, for example, when the concentration of ammonia contained in the fluid flowing through the absorbent discharge line 45 is high, the flow rate of the air returned to the section 30 through the circulation duct 81 can be increased, thereby reducing the flow rate of the air introduced into the scrubber 44. As a result, while using a constant-speed fan as the exhaust fan 242, it is possible to prevent the ammonia concentration of the fluid discharged through the absorbent discharge line 45 from exceeding the regulated value.

[0058] The floating body 1 of the second embodiment further includes a control device 248 that controls the duct damper 82 and the circulation duct damper 83 based on the detection results of the intra-compartment sensor 46 and the discharge line sensor 47. When it is determined that an ammonia leak has occurred based on the detection result of the intra-compartment sensor 46, the control device 248 adjusts the flow rate of air flowing into the scrubber 44 by adjusting the flow rate of air flowing into the duct 41 and the flow rate of air flowing into the circulation duct 81 using the duct damper 82 and the circulation duct damper 83 based on the detection result of the discharge line sensor 47. By doing this, even if the exhaust fan 242 is a constant speed fan, the control device 248 can automatically prevent the ammonia concentration contained in the fluid flowing through the absorbent discharge line 45 from exceeding the regulated value.

[0059] (Third embodiment) Next, a floating body according to a third embodiment of the present disclosure will be described with reference to the drawings. This third embodiment differs only in that the exhaust fan of the first embodiment described above is configured to also serve as a ventilation exhaust fan. Therefore, in this third embodiment, the same parts as those of the first embodiment described above will be denoted by the same reference numerals, and redundant description will be omitted. FIG. 8 is a diagram corresponding to FIG. 2 in the third embodiment of the present disclosure. The floating body 1 of the third embodiment includes a floating body main body 2, an upper structure 4, a combustion device 8, an ammonia tank 10, a piping system 20, a compartment 30, and an ammonia removal system 340. As in the first embodiment, a ventilation air supply duct 53 for ventilating the interior of the compartment 30 is connected to the compartment 30, and a ventilation air supply damper 55 is provided in the ventilation air supply duct 53.

[0060] (Configuration of ammonia removal system) As shown in FIG. 8 , the ammonia removal system 340 includes a duct 41, an exhaust fan 42, an absorption liquid supply line 43, a scrubber (ammonia removal section) 44, an absorption liquid discharge line 45, an in-compartment sensor 46, a discharge line sensor 47, a ventilation exhaust duct 354, a duct damper 82, an exhaust duct damper 85, and a control device 348.

[0061] The duct 41 has a configuration similar to that of the duct 41 of the first embodiment, and has a first end 41a connected to the compartment 30 and a second end 41b connected to the scrubber 44. The duct 41 connects the internal space of the compartment 30 with the internal space of the scrubber 44.

[0062] The exhaust fan 42 has the same configuration as the exhaust fan 42 in the first embodiment. The exhaust fan 42 is a variable speed fan whose air volume can be adjusted by the control device 348. The exhaust fan 42 is disposed near a first end 41a of the duct 41, which is the side closer to the compartment 30, and exhausts the air inside the compartment 30 to the outside of the compartment 30 via the duct 41.

[0063] The ventilation exhaust duct 354 is connected to the duct 41 by branching off. The ventilation exhaust duct 354 connects the flow path in the duct 41 with the outside of the floating body main body 2, and is configured to be able to discharge the air flowing through the duct 41 to the outside of the floating body main body 2. The ventilation exhaust duct 354, together with the ventilation air supply duct 53 and the duct 41, configures a flow path for ventilating the inside of the compartment 30.

[0064] The duct damper 82 has the same configuration as the duct damper 82 of the second embodiment, is provided in the duct 41, and is capable of adjusting the flow rate of air flowing through the duct 41. The duct damper 82 of this third embodiment is disposed closer to the scrubber 44 than the branch point P2 between the duct 41 and the ventilation exhaust duct 354. This duct damper 82 is controlled by the control device 348.

[0065] The exhaust duct damper 85 is provided in the ventilation exhaust duct 354 and is capable of adjusting the flow rate of air flowing through the ventilation exhaust duct 354. The exhaust duct damper 85 is controlled by the control device 348.

[0066] (Control device configuration) The control device 348 controls the ammonia removal system 340. The control device 348 determines whether an ammonia leak has occurred based on the detection result of the intra-compartment sensor 46. If the control device 348 determines that an ammonia leak has not occurred, the control device 348 sets the airflow rate of the exhaust fan 42 to the airflow rate for ventilation. Furthermore, the control device 348 closes the duct damper 82 and opens the exhaust duct damper 85.

[0067] When it is determined that an ammonia leak has occurred, the control device 348 operates the pump 49, opens the duct damper 82, and opens the exhaust duct damper 85. Furthermore, the control device 348 of this third embodiment adjusts the airflow rate of the exhaust fan 342 based on the detection result of the discharge line sensor 47, thereby adjusting the flow rate of air flowing into the scrubber 44. Note that the hardware configuration of the control device 348 of this third embodiment is the same as that of the first embodiment, and therefore a detailed description thereof will be omitted.

[0068] (Controller function block diagram) FIG. 9 is a functional block diagram of the control device. The CPU 61 of the control device 348 executes a program stored in advance in the HDD 64, ROM 62, or the like, thereby realizing the functional configurations of a signal receiving unit 71, an exhaust fan control unit 372, a pump control unit 73, a ventilation air supply damper control unit 76, a command signal output unit 378, a duct damper control unit 79, and an exhaust duct damper control unit 86. The signal receiving unit 71, the pump control unit 73, and the ventilation air supply damper control unit 76 have the same configurations as those of the control device 48 of the first embodiment described above.

[0069] The exhaust fan control unit 372 controls the air volume of the exhaust fan 42 based on the detection signal of the intra-compartment sensor 46 and the detection signal of the discharge line sensor 47 received by the signal receiving unit 71. For example, when it is determined based on the detection result of the intra-compartment sensor 46 that no ammonia leak has occurred within the compartment 30, the exhaust fan control unit 372 operates the exhaust fan 42 at an air volume for normal ventilation within the compartment 30 (hereinafter referred to as the ventilation air volume). On the other hand, when it is determined that an ammonia leak has occurred within the compartment 30, the exhaust fan control unit 372 operates the exhaust fan 42 at an air volume for sending air within the compartment 30 to the scrubber 44 (hereinafter referred to as the removal air volume).

[0070] Duct damper control unit 79 controls the opening degree of duct damper 82 based on the detection result of intra-compartment sensor 46. Specifically, when it is determined that an ammonia leak has occurred within compartment 30 based on the detection result of intra-compartment sensor 46, duct damper control unit 79 sets duct damper 82 to an open state (for example, fully open). On the other hand, when it is determined that an ammonia leak has not occurred within compartment 30, duct damper control unit 79 sets duct damper 82 to a closed state (for example, fully closed).

[0071] The exhaust duct damper control unit 86 controls the opening degree of the exhaust duct damper 85 based on the detection result of the intra-compartment sensor 46. Specifically, when it is determined that an ammonia leak has occurred within the compartment 30 based on the detection result of the intra-compartment sensor 46, the exhaust duct damper control unit 86 brings the exhaust duct damper 85 into a fully closed state. On the other hand, when it is determined that an ammonia leak has not occurred within the compartment 30, the exhaust duct damper control unit 86 brings the exhaust duct damper 85 into an open state (for example, fully open).

[0072] The command signal output unit 378 outputs command signals to each of the exhaust fan 42, pump 49, ventilation air supply damper 55, duct damper 82, and exhaust duct damper 85 to realize each control by the signal receiving unit 71, exhaust fan control unit 372, pump control unit 73, ventilation air supply damper control unit 76, command signal output unit 378, duct damper control unit 79, and exhaust duct damper control unit 86.

[0073] (Control device operation) FIG. 10 is a flowchart of an ammonia removal process according to an embodiment of the present disclosure. Next, the operation of the control device 348 when removing ammonia from the compartment 30 of the floating body 1 will be described with reference to the flowchart of FIG.

[0074] First, the exhaust fan control unit 72, pump control unit 73, duct damper control unit 79, and exhaust duct damper control unit 86 of the control device 348 determine whether the ammonia concentration in the compartment 30 is equal to or greater than a predetermined first threshold based on the detection result of the in-compartment sensor 46 (step S01). If it is determined that the ammonia concentration in the compartment 30 is not equal to or greater than the first threshold, there is no ammonia leakage in the compartment 30. Therefore, the duct damper control unit 79 closes the duct damper 82, and the exhaust duct damper control unit 86 opens the exhaust duct damper 85 (step S13). The exhaust fan control unit 72 also operates the exhaust fan 42 at a ventilation airflow rate, and the pump control unit 73 stops the pump 49 (step S14). At this time, the ventilation supply air damper control unit 76 opens the ventilation supply air damper 55. This allows ventilation within the compartment 30. The process then returns to step S01.

[0075] On the other hand, if it is determined in step S01 that the ammonia concentration in section 30 is equal to or greater than the predetermined first threshold, ammonia is leaking into section 30. Therefore, duct damper control unit 79 opens duct damper 82, and exhaust duct damper control unit 86 closes exhaust duct damper 85 (step S11). Furthermore, exhaust fan control unit 72 operates exhaust fan 42 at a removal airflow rate, and pump control unit 73 operates pump 49 (step S12). At this time, ventilation supply air damper control unit 76 adjusts the opening of ventilation supply air damper 55 to maintain a predetermined negative pressure in section 30. This causes air in section 30 to be sent into scrubber 44.

[0076] Next, as in the first embodiment described above, the exhaust fan control unit 72 of the control device 348 determines whether the ammonia concentration of the absorbing solution flowing through the absorbing solution discharge line 45 is equal to or greater than the second threshold value based on the detection result of the discharge line sensor 47 (step S03). This determination determines whether the ammonia concentration of the absorbing solution discharged to the outside of the floating body 2 through the absorbing solution discharge line 45 satisfies, for example, regulations regarding ocean discharge. If this determination determines that the ammonia concentration of the absorbing solution flowing through the absorbing solution discharge line 45 is not equal to or greater than the second threshold value, the process returns to step S01. On the other hand, if it determines that the ammonia concentration of the absorbing solution flowing through the absorbing solution discharge line 45 is equal to or greater than the second threshold value, the process returns to step S03, reducing the airflow rate of the exhaust fan 42 by a predetermined amount. That is, the airflow rate of the exhaust fan 42 is reduced until the ammonia concentration of the absorbing solution flowing through the absorbing solution discharge line 45 becomes less than the predetermined value.

[0077] (Action and effect) According to the float 1 of the third embodiment, as with the float 1 of the first embodiment, air containing ammonia that has leaked into the compartment 30 and evaporated can be introduced into the scrubber 44 via the duct 41 to remove the ammonia. Furthermore, the absorbing liquid that has absorbed the ammonia in the scrubber 44 is released into the water via the absorbing liquid release line 45, which prevents the ammonia contained in the absorbing liquid from re-evaporating and being released into the atmosphere, thereby preventing contact with workers. Furthermore, since the absorbing liquid that has absorbed ammonia does not remain inside the float main body 2, contact between the absorbing liquid that has absorbed the ammonia and workers can be prevented. Therefore, it is possible to prevent workers from coming into contact with ammonia without flooding the equipment in the compartment 30.

[0078] The floating body 1 of the third embodiment is equipped with a ventilation exhaust duct 354, a duct damper 82, and an exhaust duct damper 85. This configuration makes it possible to switch between a flow path connecting the inside of the compartment 30 with the outside of the ship and a flow path connecting the inside of the compartment 30 with the inside of the scrubber 44. The exhaust fan 42 is provided in a common portion of these two flow paths that are used alternately, so that a single exhaust fan 42 can be used to ventilate the inside of the compartment 30 and to send the air inside the compartment 30 to the scrubber 44. This allows for a reduction in the number of parts compared to when a ventilation fan and a fan for ammonia removal are provided separately.

[0079] (Fourth embodiment) Next, a floating body according to a fourth embodiment of the present disclosure will be described with reference to the drawings. This fourth embodiment is different from the first embodiment in that the ventilation exhaust duct 54 and the ventilation exhaust fan 56 are omitted. Therefore, in this fourth embodiment, the same parts as those in the first embodiment will be described with the same reference numerals, and duplicated explanations will be omitted.

[0080] (Configuration of ammonia removal system) FIG. 11 is a diagram corresponding to FIG. 2 according to the fourth embodiment of the present disclosure. As shown in FIG. 11 , the ammonia removal system 40 of the fourth embodiment includes a duct 41, an exhaust fan 42, an absorbent supply line 43, a scrubber 44, an absorbent discharge line 45, an in-compartment sensor 46, a discharge line sensor 47, and a control device 448. A ventilation air supply duct 53 is connected to the compartment 30 to ventilate the interior of the compartment 30. Furthermore, a ventilation air supply damper 55 is attached to the ventilation air supply duct 53.

[0081] (Control device configuration) The control device 448 has the same configuration as the control device 48 of the first embodiment described above in that it removes ammonia contained in the air within the compartment 30 using the scrubber 44. On the other hand, the control device 448 controls the opening and closing of the opening / closing damper 58 based on the detection results of the intra-compartment sensor 46. That is, the control device 448 switches between a state in which the opening / closing damper 58 is opened so that the air within the compartment 30 can be discharged to the outside of the floating body main body 2 via the duct 41, the scrubber 44, and the atmosphere release line 57, and a state in which the opening / closing damper 58 is closed so that the air within the compartment 30 flows into the scrubber 44, where ammonia is removed, and the air is discharged from the absorption liquid release line 45.

[0082] (Controller function block diagram) FIG. 12 is a functional block diagram of the control device. The CPU 61 of the control device 48 executes a program previously stored in the HDD 64, ROM 62, etc., thereby realizing the functional configurations of a signal receiving unit 71, an exhaust fan control unit 72, a pump control unit 73, a ventilation air supply damper control unit 76, a ventilation exhaust fan control unit 77, a command signal output unit 478, and an opening / closing damper control unit 87.

[0083] The open / close damper control unit 87 controls the opening and closing of the open / close damper 58 based on the detection signal from the intra-compartment sensor 46. Specifically, when it is determined that an ammonia leak has occurred within the compartment 30 based on the detection signal from the intra-compartment sensor 46, the open / close damper control unit 87 closes the open / close damper 58. On the other hand, when it is determined that an ammonia leak has not occurred within the compartment 30, the open / close damper control unit 87 opens the open / close damper 58.

[0084] The command signal output unit 478 outputs command signals to each of the exhaust fan 42, pump 49, ventilation air supply damper 55, and opening / closing damper 58 to realize each control by the exhaust fan control unit 72, pump control unit 73, ventilation air supply damper control unit 76, and opening / closing damper control unit 87.

[0085] (Control device operation) FIG. 13 is a flowchart of the ammonia removal process in the first embodiment of the present disclosure. Next, the operation of the control device 448 when removing ammonia from the compartment 30 of the floating body 1 described above will be described with reference to the flowchart of Fig. 13. Note that the operation of this control device 448 is the same as that of the third embodiment shown in Fig. 10, except that step S11 is replaced with step S21 and step S13 is replaced with step S23.

[0086] First, the exhaust fan control unit 72, pump control unit 73, duct damper control unit 79, and on-off damper control unit 87 of the control device 448 determine whether the ammonia concentration in the compartment 30 is equal to or greater than a predetermined first threshold based on the detection result of the intra-compartment sensor 46 (step S01). If it is determined that the ammonia concentration in the compartment 30 is not equal to or greater than the first threshold, there is no ammonia leakage in the compartment 30, and the on-off damper control unit 87 opens the on-off damper 58 (step S23). The exhaust fan control unit 72 also operates the exhaust fan 42 at a ventilation airflow rate, and the pump control unit 73 stops the pump 49 (step S14). At this time, the ventilation supply air damper control unit 76 opens the ventilation supply air damper 55. This allows ventilation within the compartment 30 via the ventilation supply air duct 53, the duct 41, the scrubber 44, and the atmospheric release line 57. Then, the process returns to step S01. In step S14, the pump control unit 73 may continue to operate the pump 49 without stopping it.

[0087] On the other hand, if it is determined in step S01 that the ammonia concentration in the section 30 is equal to or greater than the predetermined first threshold, ammonia is leaking into the section 30, and the duct damper control unit 79 closes the on-off damper 58 (step S21). The exhaust fan control unit 72 operates the exhaust fan 42 at a removal airflow rate, and the pump control unit 73 operates the pump 49 (step S12). At this time, the ventilation supply air damper control unit 76 adjusts the opening of the ventilation supply air damper 55 to maintain a predetermined negative pressure in the section 30. As a result, the air in the section 30 is sent into the scrubber 44 but is not released to the atmosphere via the atmosphere release line 57. The explanation of steps S03 and S04 is omitted because they are the same as those in the first embodiment described above.

[0088] (Action and effect) According to the float 1 of the fourth embodiment, as with the float 1 of the first embodiment, air containing ammonia that has leaked into the compartment 30 and evaporated can be introduced into the scrubber 44 via the duct 41 to remove the ammonia. Furthermore, the absorbing liquid that has absorbed the ammonia in the scrubber 44 is released into the water via the absorbing liquid release line 45, which prevents the ammonia contained in the absorbing liquid from re-evaporating and being released into the atmosphere, resulting in contact with workers. Furthermore, since the absorbing liquid that has absorbed ammonia does not remain inside the float main body 2, contact between the absorbing liquid that has absorbed the ammonia and workers can be prevented. Therefore, it is possible to prevent workers from coming into contact with ammonia without flooding the equipment in the compartment 30.

[0089] The control device 448 of the fourth embodiment controls the opening and closing of the on-off damper 58. This allows a single exhaust fan 42 to be used, and the atmosphere release line 57 to be used instead of a ventilation exhaust duct. Furthermore, the ventilation exhaust duct can be omitted. Therefore, the number of parts can be reduced compared to when a ventilation fan and an ammonia removal fan are separately provided, or when a ventilation exhaust duct is provided. As a result, the compartment 30 can be ventilated, and the air in the compartment 30 can be sent to the scrubber 44 to remove ammonia. Furthermore, in the event of an ammonia leak, contact of workers with air containing ammonia can be prevented.

[0090] (First Modification of Each Embodiment) Next, a first modified example of each embodiment of the present disclosure will be described with reference to Fig. 14. This first modified example differs from the above-described embodiments only in the configuration related to the supply of the absorbing liquid, and therefore the same parts as those in each embodiment will be denoted by the same reference numerals and redundant description will be omitted. In addition, a case where this modified example is applied to the first embodiment will be described as an example.

[0091] FIG. 14 is a diagram corresponding to FIG. 2 in a first modified example of the embodiment of the present disclosure. As shown in FIG. 14 , the ammonia removal system 40 in this first modified example includes a duct 41, an exhaust fan 42, an absorption liquid supply line 43, a scrubber 44, an absorption liquid discharge line 45, an in-compartment sensor 46, a discharge line sensor 47, a control device 48, and a heat exchanger 88.

[0092] The heat exchanger 88 exchanges heat between the absorbing liquid flowing inside the absorbing liquid supply line 43 and an external heat medium to heat or cool the absorbing liquid. The heat exchanger 88 of this modification exchanges heat between the absorbing liquid and a heat medium such as heated water for heating the fuel ammonia, for example, to effectively utilize the cold energy of the fuel ammonia, thereby lowering the liquid temperature of the absorbing liquid. Here, if the absorbing liquid is capable of improving the absorption rate of ammonia by increasing its temperature, the absorbing liquid may be heated using the heat exchanger 88. Therefore, according to the first modified example, the rate of absorption of ammonia by the absorbing liquid can be improved, and therefore the energy consumed by the pump 49 can be reduced.

[0093] (Second Modification of Each Embodiment) Next, a second modified example of each embodiment of the present disclosure will be described with reference to Fig. 15. This second modified example differs from the above-described embodiments only in the configuration of the scrubber, and therefore the same parts as those in each embodiment will be described with the same reference numerals and redundant description will be omitted.

[0094] FIG. 15 is an enlarged view of a scrubber in a second modified example of each embodiment of the present disclosure. 15, the scrubber 244 in this second modified example is disposed outside the compartment 30, similar to the above-described scrubber 44. The scrubber 244 is configured to remove ammonia contained in the air discharged from the compartment 30 via the duct 41 by causing the ammonia to be absorbed in an absorbing liquid supplied via an absorbing liquid supply line 43.

[0095] The scrubber 244 includes a scrubber casing 91 , a liquid storage section 92 , a nozzle section 50 , and an internal absorption liquid supply line 93 . The scrubber casing 91 defines an interior space 95 of the scrubber 244 . The liquid storage section 92 is configured to be able to store the absorbing liquid in at least a part of the internal space 95. The liquid storage section 92 of this second modified example, together with the scrubber casing 91, forms a storage space for storing the absorbing liquid. The liquid storage section 92 is configured to allow the absorbing liquid to overflow from its upper part, and the overflowing absorbing liquid is discharged to the outside of the scrubber casing 91 via the absorbing liquid discharge line 45. A duct 41 is connected below the liquid level of the liquid storage section 92, and air sent through the duct 41 is released into the absorbing liquid stored in the liquid storage section 92 and moves upward as air bubbles. The air that reaches the liquid level of the liquid storage section 92 is released from the liquid level into the internal space 95.

[0096] The internal absorbing liquid supply line 93 supplies the absorbing liquid to the nozzle section 50 and the liquid storage section 92. The internal absorbing liquid supply line 93 has a main line 93A that supplies the absorbing liquid to the nozzle section 50, and a branch line 93B that branches off from the main line 93A and leads to the liquid storage section 92. The nozzle unit 50 is provided at the upper part of the internal space 95 and sprays the absorbing liquid. The absorbing liquid sprayed from the nozzle unit 50 moves downward due to its own weight and comes into contact with the air supplied to the internal space 95 via the liquid storage unit 92. Through this contact, the ammonia contained in the air is absorbed by the absorbing liquid and reaches the lower part of the internal space 95, and is discharged from the absorbing liquid discharge line 45 together with the overflowing absorbing liquid.

[0097] Moreover, in the second modified example, a dilution water line 96 is provided. This dilution water line 96 is capable of sending dilution water (e.g., seawater or fresh water) using a dilution water pump (not shown) to join the absorbent discharge line 45. This dilution water pump (not shown) is a variable flow rate type pump, and is controlled by, for example, a control device 48, 248, 348, 448 to join the absorbent discharge line 45 with dilution water at a flow rate corresponding to the detection result of the discharge line sensor 47. Here, the flow rate of the dilution water can be controlled according to the discharge ammonia concentration discharged from the absorbent discharge line 45. For example, the discharge ammonia concentration can be determined from the flow rate of the dilution water and the ammonia concentration detected by the ammonia sensor.

[0098] The dilution water line 96 in the second modified example may be provided as appropriate or may be omitted. By providing this configuration of the dilution water line 96, it is not necessary to provide the pump 49 with a flow rate sufficient for dilution, making it possible to reduce the size of the pump 49. Furthermore, the dilution water pump (not shown) in the second modified example is not limited to a variable flow rate type, and may be, for example, a pump that can supply a constant flow rate at the maximum flow rate. In addition, in the second modified example, the discharge line sensor 47 provided in the absorption liquid discharge line 45 has been described as an example of an ammonia sensor, but for example, an internal space sensor 97 provided in the space of the internal space 95 excluding the liquid storage section 92 may also be used.

[0099] Furthermore, although the scrubber 244 in the second modified example has been described as having the liquid storage section 92 inside the scrubber casing 91, the liquid storage section 92 may be disposed outside the scrubber casing 91. In this case, for example, an overflow pipe of the liquid storage section 92 may be connected to the scrubber casing 91, and the gas phase of the liquid storage section 92 and the gas phase of the scrubber casing 91 may be communicated with each other by piping or the like.

[0100] According to the second modified example, the air sent through the duct 41 can be brought into contact with the absorption liquid without fail, and therefore, it is possible to prevent air from which ammonia has not been sufficiently removed from being discharged from the absorption liquid discharge line 45.

[0101] Other Embodiments The above describes in detail the embodiments of the present disclosure with reference to the drawings, but the specific configuration is not limited to this embodiment, and design changes and the like are also included within the scope that does not deviate from the gist of the present disclosure. For example, in the first to third embodiments, the atmosphere release line 57 and the open / close damper 58 may be omitted.

[0102] In the above embodiments, the description has been given of a case where the absorbent discharge line 45 is provided with a discharge line sensor 47, and the flow rate of air flowing through the duct 41 is adjusted based on the detection result of the discharge line sensor 47. However, if the ammonia concentration of the fluid discharged from the absorbent discharge line 45 is designed to be sufficiently low in advance, and there is no possibility that the ammonia concentration of the fluid discharged from the absorbent discharge line 45 will exceed the regulated value, the discharge line sensor 47 may be omitted, and control based on the detection result of the discharge line sensor 47 may not be performed. Furthermore, even if the discharge line sensor 47 is provided, the detection result of the discharge line sensor 47 may be used only to confirm whether ammonia removal by the scrubber 44 is being performed.

[0103] In the above embodiments, a configuration has been described in which the control devices 48, 248, 348, 448 automatically remove ammonia using the scrubber 44 when an ammonia leak occurs within the compartment 30. However, the control devices 48, 248, 348, 448 may be omitted, and the ammonia within the compartment 30 may be removed by an operator, for example, visually checking the detection results of the in-compartment sensor 46 on a display device and operating the exhaust fan 42, 242.

[0104] In each of the above embodiments, a dedicated pump 49 is provided to supply the absorbing liquid to the scrubber 44 via the absorbing liquid supply line 43. However, the pump 49 for supplying the absorbing liquid may also be another seawater or freshwater pump provided in the floating body 2. Furthermore, the pump 49 is operated when it is determined that an ammonia leak has occurred, and is stopped in other cases, but may be operated at all times. In the modified example of the above embodiment, the case where the exhaust heat of the combustion device 8 is used has been described, but thermal energy supplied from a heat source other than the combustion device 8 may also be used.

[0105] In the second variant of the above embodiment, a case has been described in which a dilution water line 96 is provided, but for example, the dilution water line 96 of this second variant may be provided as appropriate for the first to fourth embodiments and the first variant.

[0106] In the above first and second embodiments, the case where a ventilation air supply duct 53, a ventilation exhaust fan 56, a ventilation exhaust damper 59, a ventilation exhaust damper control unit 75, a ventilation air supply damper control unit 76, and a ventilation exhaust fan control unit 77 are respectively described, but these configurations may be omitted as appropriate. In the above embodiments, an example has been described in which a computer device is used as the control device 48, 248, 348, 448. However, for example, the functional configuration of the control device 48, 248, 348, 448 may be realized by hardware such as a relay circuit, or by a combination of hardware and software.

[0107] <Additional Notes> The floating body 1 described in the embodiment can be understood, for example, as follows.

[0108] (1) According to a first aspect, a float 1 comprises a float body 2, a compartment 30 provided in the float body 2 and accommodating ammonia-related equipment therein, a duct 41 connected to the compartment 30 and communicating the inside of the compartment 30 with the outside of the compartment 30, an exhaust fan 42, 242 that discharges the air inside the compartment 30 to the outside of the compartment 30 via the duct 41, an absorbing liquid supply line 43 that supplies an absorbing liquid capable of absorbing ammonia, an ammonia removal unit 44 arranged outside the compartment 30 and capable of removing ammonia contained in the air discharged by the exhaust fan 42, 242 through the duct 41 by causing the absorbing liquid supplied by the absorbing liquid supply line 43 to absorb and remove the ammonia, and an absorbing liquid discharge line 45 that discharges the absorbing liquid in which the ammonia has been absorbed by the ammonia removal unit 44 and the air from which the ammonia has been removed into the water surrounding the floating body 2. An example of the ammonia removal section 44 is a scrubber.

[0109] As a result, air containing ammonia that has leaked into compartment 30 and vaporized can be introduced into the ammonia removal section 44 via duct 41, where the ammonia can be removed. Furthermore, the absorbing liquid that has absorbed the ammonia in the ammonia removal section 44 is released into the water via the absorbing liquid release line 45, which prevents the ammonia contained in the absorbing liquid from vaporizing again and being released into the atmosphere, resulting in contact with workers. Furthermore, since the absorbing liquid that has absorbed ammonia does not remain inside the floating body 2, it is possible to prevent contact between the absorbing liquid that has absorbed the ammonia and workers. Therefore, it is possible to prevent workers from coming into contact with ammonia without flooding the equipment in compartment 30.

[0110] (2) The floating body 1 according to the second aspect is the floating body 1 of (1), and is provided with an intra-compartment sensor 46 capable of detecting ammonia contained in the air inside the compartment 30. This makes it possible to detect an ammonia leak within the compartment 30 based on the detection result of the in-compartment sensor 46. This makes it possible to operate the exhaust fan 42 to remove ammonia only when an ammonia leak occurs within the compartment 30, thereby achieving energy savings.

[0111] (3) The float 1 according to the third aspect is the float 1 of (2), and is provided with a discharge line sensor 47 capable of detecting ammonia contained in the fluid flowing through the absorbent discharge line 45. As a result, for example, if the ammonia concentration in the fluid flowing through the absorption liquid discharge line 45 is high, the flow rate of air introduced from section 30 to the scrubber 44 can be reduced so that the ammonia concentration in the fluid discharged through the absorption liquid discharge line 45 does not exceed the regulated value.

[0112] (4) The floating body 1 according to a fourth aspect is the floating body 1 of (3), wherein the exhaust fan 42 is a variable speed fan whose air volume can be adjusted. As a result, for example, when the concentration of ammonia contained in the fluid flowing through the absorption liquid discharge line 45 is high, the ammonia concentration of the fluid flowing through the absorption liquid discharge line 45 can be reduced by reducing the airflow rate of the exhaust fan 42 in accordance with the ammonia concentration.

[0113] (5) The float 1 according to the fifth aspect is any one of the floats 1 of (2) to (4), and is equipped with a control device 48, 248, 348, 448 that determines whether or not an ammonia leak has occurred based on the detection result of the intracompartment sensor 46, and activates the exhaust fan 42, 242 when it is determined that an ammonia leak has occurred. This allows the control device 48, 248, 348, 448 to automatically remove any ammonia that has leaked into the compartment 30.

[0114] (6) The float 1 according to the sixth aspect is the float 1 of (5), and is equipped with a control device 48, 248, 348, 448 that determines whether or not an ammonia leak has occurred based on the detection result of the in-compartment sensor 46, and activates the exhaust fan 42, 242 if it is determined that an ammonia leak has occurred, and adjusts the air volume of the exhaust fan 42, 242 based on the detection result of the discharge line sensor 47. This automatically prevents the concentration of ammonia contained in the fluid flowing through the absorbent discharge line 45 from exceeding the regulated value.

[0115] (7) The float 1 of the seventh aspect is a float 1 of (3), and is provided with a circulation duct 81 that is branched off and connected to the duct 41 to return the air flowing through the duct 41 to the section 30, a duct damper 82 that is provided in the duct 41 and can adjust the flow rate of the air flowing through the duct 41, and a circulation duct damper 83 that is provided in the circulation duct 81 and can adjust the flow rate of the air flowing through the circulation duct 81, and the exhaust fan 242 is a constant speed fan that maintains a constant flow rate. This makes it possible to change the flow rate of air flowing from the duct 41 into the scrubber 44 even when the airflow rate of the exhaust fan 242 cannot be adjusted. Therefore, for example, when the concentration of ammonia contained in the fluid flowing through the absorbent discharge line 45 is high, the flow rate of air introduced from the section 30 into the scrubber 44 can be reduced to prevent the ammonia concentration of the fluid discharged through the absorbent discharge line 45 from exceeding the regulated value.

[0116] (8) The float 1 according to the eighth aspect is a float 1 of (7), which is equipped with a control device that controls the duct damper and the circulation duct damper based on the detection results of the intra-compartment sensor and the discharge line sensor, and when it is determined based on the detection results of the intra-compartment sensor that no ammonia leakage has occurred, the control device closes the duct damper and opens the circulation duct damper, while when it is determined that an ammonia leakage has occurred, the control device adjusts the flow rate of the air flowing into the duct and the flow rate of the air flowing into the circulation duct using the duct damper and the circulation duct damper based on the detection results of the discharge line sensor, thereby adjusting the flow rate of the air flowing into the ammonia removal section. As a result, even if the exhaust fan 242 is a constant speed fan, the control device 248 can automatically prevent the concentration of ammonia contained in the fluid flowing through the absorbent discharge line 45 from exceeding the regulated value.

[0117] (9) The float 1 according to the ninth aspect is any one of the floats 1 of (1) to (8), and is equipped with a ventilation exhaust fan 56 that discharges the air inside the compartment 30 to the outside of the float main body 2. This allows ventilation within the compartment 30 to be performed by the ventilation exhaust fan 56 when there is no ammonia leakage.

[0118] (10) The float 1 according to the tenth aspect is a float 1 of (1), and is provided with an exhaust duct 354 that is branched off and connected to the duct 41 to discharge the air flowing through the duct 41 to the outside of the float main body 2, a duct damper 82 that is provided in the duct 41 and can adjust the flow rate of the air flowing through the duct 41, and an exhaust duct damper 85 that is provided in the exhaust duct 354 and can adjust the flow rate of the air flowing through the exhaust duct 354. This makes it possible to switch between the flow path formed by the duct 41 and the exhaust duct 354, which connects the inside of the compartment 30 with the outside of the ship, and the flow path formed by the duct 41, which connects the inside of the compartment 30 with the inside of the scrubber 44. Furthermore, since the exhaust fan 42 is provided in a common portion of these two flow paths which are used switchably, it is possible to use a single exhaust fan 42 to ventilate the inside of the compartment 30 and to send the air inside the compartment 30 to the scrubber 44. Therefore, the number of parts can be reduced compared to when a ventilation fan and a fan for removing ammonia are provided separately.

[0119] (11) The float 1 according to an eleventh aspect is the float 1 of (10), and is provided with an intra-compartment sensor 46 capable of detecting ammonia contained in the air inside the compartment 30. This makes it possible to detect an ammonia leak in the compartment 30 based on the detection result of the in-compartment sensor 46, and when it is determined that an ammonia leak has occurred, it becomes possible to switch to a flow path formed by the duct 41 that communicates between the compartment 30 and the scrubber 44. This makes it possible to further prevent workers from coming into contact with ammonia.

[0120] (12) The float 1 according to the twelfth aspect is the float 1 of (11), and is provided with a control device 348 that controls the duct damper 82 and the exhaust duct damper 85 based on the detection results of the intra-compartment sensor 46, and when it is determined that no ammonia leakage has occurred, the control device 348 places the duct damper 82 in a closed state and the exhaust duct damper 85 in an open state, while when it is determined that an ammonia leakage has occurred, the control device 348 places the duct damper 82 in an open state and the exhaust duct damper 85 in a closed state. This allows any ammonia leaking into compartment 30 to be automatically removed.

[0121] (13) The floating body 1 according to a thirteenth aspect is the floating body 1 according to (12), wherein the exhaust fan 42 is a variable speed fan whose air volume can be adjusted. As a result, for example, when the concentration of ammonia contained in the fluid flowing through the absorption liquid discharge line 45 is high, the ammonia concentration of the fluid flowing through the absorption liquid discharge line 45 can be reduced by reducing the airflow rate of the exhaust fan 42 in accordance with the ammonia concentration.

[0122] (14) The float 1 according to the fourteenth aspect is the float 1 of (13), which is provided with a discharge line sensor 47 capable of detecting ammonia contained in the fluid flowing through the absorption liquid discharge line 45, and the control device 348 adjusts the air volume of the exhaust fan 42 based on the detection result of the discharge line sensor 47. This automatically prevents the concentration of ammonia contained in the fluid flowing through the absorbent discharge line 45 from exceeding the regulated value.

[0123] (15) The float 1 according to the fifteenth aspect is the float 1 of (2), wherein the ammonia removal section 44 is provided with an atmosphere release line 57 capable of releasing the air that has flowed into the ammonia removal section 44 through the duct 41 into the atmosphere, and an opening / closing damper 58 that opens and closes the atmosphere release line 57. This allows the atmospheric release line 57 to be used instead of a ventilation exhaust duct. Therefore, compared to when a ventilation fan and an ammonia removal fan are separately provided, the number of parts can be reduced, while still allowing ventilation inside the compartment 30 and sending the air inside the compartment 30 to the scrubber 44 to remove ammonia. Furthermore, in the event of an ammonia leak, it is possible to prevent workers from coming into contact with air containing ammonia.

[0124] (16) The float 1 according to the sixteenth aspect is the float of (15), and is provided with a control device 448 that controls the opening and closing of the opening / closing damper 58 based on the detection results of the intra-compartment sensor 46. This allows any ammonia leaking into compartment 30 to be automatically removed.

[0125] (17) The float 1 according to the seventeenth aspect is the float 1 of (16), and is provided with a discharge line sensor 47 capable of detecting ammonia contained in the fluid flowing through the absorption liquid discharge line, the exhaust fan 42 is a variable speed fan capable of adjusting the air volume, and the control device 448 adjusts the air volume of the exhaust fan 42 based on the detection result of the discharge line sensor 47. This automatically prevents the concentration of ammonia contained in the fluid flowing through the absorbent discharge line 45 from exceeding the regulated value.

[0126] (18) The float 1 according to an eighteenth aspect is any one of the floats 1 according to (1) to (17), and is provided with a heat exchanger 88 capable of heating or cooling the absorption liquid. This improves the rate at which the absorbent absorbs ammonia, thereby reducing the energy consumed by the pump 49. [Explanation of symbols]

[0127] 1...Floating body 2...Floating body main body 3a...Bow 3b...Stern 4...Superstructure 5A, 5B...Side 6...Bottom of the vessel 7...Upper deck 8...Combustion device 10...Ammonia tank 20...Piping system 30...Compartment 40, 240...Ammonia removal system 41...Duct 42, 242...Exhaust fan 43...Absorbent supply line 44, 244...Scrubber 45...Absorbent discharge line 46...In-compartment sensor 47...Discharge line sensor 48, 248, 348, 448...Control device 49...Pump 50...Nozzle section 53...Ventilation air intake duct 54, 354...Ventilation exhaust duct 55...Ventilation air intake damper 56...Ventilation exhaust fan 57...Atmospheric release line 58...Open / close damper 59...Ventilation exhaust damper 61...CPU 62...ROM 63...RAM 64...HDD 65...Signal transmitting / receiving module 71...Signal receiving section 72, 272...Exhaust fan control section 73...Pump control section 76...Ventilation intake air damper control section 77...Ventilation exhaust fan control section 78, 278, 378...Command signal output section 79...Duct damper control section 80...Circulation duct damper control section 81...Circulation duct 82...Duct damper 83...Circulation duct damper 85...Exhaust duct damper 86...Exhaust duct damper control section 87...Opening / closing damper control section 88...Heat exchanger 91...Scrubber casing 92...Liquid storage section 93...Internal absorption liquid supply line 93A...Main line 93B...Branch line 95...Internal space 97...Internal space sensor

Claims

1. A floating body, a compartment provided in the floating body and accommodating ammonia-related equipment therein; a duct connected to the compartment to communicate the inside of the compartment with the outside of the compartment; an exhaust fan that exhausts air inside the compartment to the outside of the compartment through the duct; an absorption liquid supply line for supplying an absorption liquid capable of absorbing ammonia; an ammonia removal unit that is arranged outside the compartment and is capable of removing ammonia contained in the air discharged by the exhaust fan through the duct by causing the ammonia to be absorbed in the absorption liquid supplied through the absorption liquid supply line; an absorbing liquid discharge line that discharges the absorbing liquid that has absorbed the ammonia at least in the ammonia removal section into the surrounding water in which the floating body floats; an intra-compartment sensor capable of detecting ammonia in the air within the compartment; a discharge line sensor capable of detecting ammonia contained in the fluid flowing through the absorption liquid discharge line; Equipped with A control device is provided which determines whether or not an ammonia leak has occurred based on the detection result of the in-compartment sensor, and operates the exhaust fan when it is determined that an ammonia leak has occurred, and adjusts the air volume of the exhaust fan based on the detection result of the discharge line sensor. Floating body.

2. The exhaust fan is a variable speed fan whose air volume can be adjusted. The floating body according to claim 1.

3. A floating body, a compartment provided in the floating body and accommodating ammonia-related equipment therein; a duct connected to the compartment to communicate the inside of the compartment with the outside of the compartment; an exhaust fan that exhausts air inside the compartment to the outside of the compartment through the duct; an absorption liquid supply line for supplying an absorption liquid capable of absorbing ammonia; an ammonia removal unit that is arranged outside the compartment and is capable of removing ammonia contained in the air discharged by the exhaust fan through the duct by causing the ammonia to be absorbed in the absorption liquid supplied through the absorption liquid supply line; an absorbing liquid discharge line that discharges the absorbing liquid that has absorbed the ammonia at least in the ammonia removal section into the surrounding water in which the floating body floats; an intra-compartment sensor capable of detecting ammonia in the air within the compartment; a discharge line sensor capable of detecting ammonia contained in the fluid flowing through the absorption liquid discharge line; a circulation duct that is branched off from the duct and returns the air flowing through the duct to the compartment; a duct damper provided in the duct and capable of adjusting the flow rate of the air flowing through the duct; a circulation duct damper provided in the circulation duct and capable of adjusting the flow rate of the air flowing through the circulation duct; Equipped with The exhaust fan is a constant speed fan that maintains a constant flow rate. Floating body.

4. a control device that controls the duct damper and the circulation duct damper based on detection results of the intra-compartment sensor and the discharge line sensor; The control device When it is determined that an ammonia leak has occurred based on the detection result of the intra-compartment sensor, the flow rate of the air flowing into the duct and the flow rate of the air flowing into the circulation duct are adjusted by the duct damper and the circulation duct damper based on the detection result of the discharge line sensor, thereby adjusting the flow rate of the air flowing into the ammonia removal section. The floating body according to claim 3.

5. 5. The floating body according to claim 1, further comprising a ventilation exhaust fan that discharges air from the compartment to the outside of the floating body.

6. A floating body, a compartment provided in the floating body and accommodating ammonia-related equipment therein; a duct connected to the compartment to communicate the inside of the compartment with the outside of the compartment; an exhaust fan that exhausts air inside the compartment to the outside of the compartment through the duct; an absorption liquid supply line for supplying an absorption liquid capable of absorbing ammonia; an ammonia removal unit that is arranged outside the compartment and is capable of removing ammonia contained in the air discharged by the exhaust fan through the duct by causing the ammonia to be absorbed in the absorption liquid supplied through the absorption liquid supply line; an absorbing liquid discharge line that discharges the absorbing liquid that has absorbed the ammonia at least in the ammonia removal section into the surrounding water in which the floating body floats; a ventilation exhaust duct that is branched off from the duct and exhausts the air flowing through the duct to the outside of the floating body; a duct damper provided in the duct and capable of adjusting the flow rate of the air flowing through the duct; an exhaust duct damper provided in the ventilation exhaust duct and capable of adjusting the flow rate of the air flowing through the ventilation exhaust duct; Equipped with Floating body.

7. an in-compartment sensor capable of detecting ammonia contained in the air inside the compartment; The floating body according to claim 6.

8. a control device that controls the duct damper and the exhaust duct damper based on the detection result of the intra-compartment sensor, The control device When it is determined that no ammonia leakage has occurred, the duct damper is closed and the exhaust duct damper is opened, When it is determined that the ammonia leak has occurred, the duct damper is opened and the exhaust duct damper is closed. The floating body according to claim 7.

9. The exhaust fan is a variable speed fan with adjustable airflow. The floating body according to claim 8.

10. a discharge line sensor capable of detecting ammonia contained in the fluid flowing through the absorption liquid discharge line; The control device The air volume of the exhaust fan is adjusted based on the detection result of the discharge line sensor. The floating body according to claim 9.

11. A floating body, a compartment provided in the floating body and accommodating ammonia-related equipment therein; a duct connected to the compartment to communicate the inside of the compartment with the outside of the compartment; an exhaust fan, which is a variable speed fan capable of adjusting the air volume, that exhausts the air inside the compartment to the outside of the compartment through the duct; an absorption liquid supply line for supplying an absorption liquid capable of absorbing ammonia; an ammonia removal unit that is arranged outside the compartment and is capable of removing ammonia contained in the air discharged by the exhaust fan through the duct by causing the ammonia to be absorbed in the absorption liquid supplied through the absorption liquid supply line; an absorbing liquid discharge line that discharges the absorbing liquid that has absorbed the ammonia at least in the ammonia removal section into the surrounding water in which the floating body floats; an intra-compartment sensor capable of detecting ammonia in the air within the compartment; a discharge line sensor capable of detecting ammonia contained in the fluid flowing through the absorption liquid discharge line; Equipped with The ammonia removal unit an atmosphere release line capable of releasing the air that has flowed into the ammonia removal unit through the duct into the atmosphere; an opening / closing damper that opens and closes the atmosphere release line; Equipped with a control device that controls the opening and closing of the open / close damper and adjusts the air volume of the exhaust fan based on the detection result of the discharge line sensor. Floating body.

12. a heat exchanger capable of heating or cooling the absorption liquid; A floating body according to any one of claims 1 to 11.

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