Floating body and ammonia treatment method of floating body

Abstract

A floating body is provided with: a floating body main body; the ammonia equipment is arranged on the floating body main body; the ventilation opening is exposed out of the outer surface of the floating body and is communicated with an area in the floating body; an air washer which is provided in the ventilation opening and is capable of supplying water to the ventilation opening while circulating air inside and outside the ventilation opening; a water supply unit for supplying water to the air scrubber; a sensor capable of detecting the outflow of ammonia from the ammonia plant into the atmosphere; a control device that operates the air scrubber when ammonia outflow is detected by the sensor; and a water treatment unit for recovering used water used by the air scrubber.

Description

Technical Field

[0001] The invention relates to a floating body and an ammonia treatment method for the floating body.

[0002] This application claims priority based on patent application No. 2022-142115 filed in Japan on September 7, 2022, and the contents are incorporated herein by reference. Background Art

[0003] In a ship carrying a combustible gas as a fuel for ship propulsion or a cargo, a vent column for discharging the combustible gas into the atmosphere outside the ship may be provided.

[0004] On the other hand, ammonia may be loaded as a ship propulsion fuel or cargo. Even in the case of such ammonia being loaded, it is conceivable to discharge the ammonia into the atmosphere through a vent column when the pressure of the ammonia rises excessively.

[0005] However, ammonia is highly toxic, so measures need to be taken to suppress the intrusion of ammonia emitted into the atmosphere into the interior space of the hull, superstructure, etc.

[0006] For example, Patent Document 1 discloses a leaked ammonia removing device that removes ammonia leaked from an ammonia refrigeration device by ventilation.

[0007] Previous technical literature

[0008] Patent Literature

[0009] Patent Document 1: Japanese Patent No. 3066828 Summary of the invention

[0010] Technical issues to be solved by the invention

[0011] However, in the leaked ammonia removal device described in Patent Document 1, leaked ammonia is removed by ventilation. However, even if this structure is applied to a ship, it may not be possible to fully suppress the intrusion of ammonia into the internal space of the hull or superstructure, etc., depending on the amount of ammonia discharged into the atmosphere from the ventilation column.

[0012] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a floating body capable of suppressing the intrusion of ammonia into the internal space, and an ammonia treatment method for the floating body.

[0013] Means for solving technical problems

[0014] In order to solve the above-mentioned problems, the float involved in the present invention includes a float body, an ammonia device, a vent, an air scrubber, a water supply unit, a sensor, a control device and a water treatment unit. The ammonia device is arranged on the float body. The vent is exposed on the outer surface of the float body. The vent is connected to the area inside the float body. The air scrubber is arranged on the vent. The air scrubber can circulate air inside and outside the vent while supplying water to the vent. The water supply unit supplies the water to the air scrubber. The sensor can detect the outflow of ammonia from the ammonia device to the atmosphere. When the outflow of ammonia is detected by the sensor, the control device operates the air scrubber. The water treatment unit recovers the used water used by the air scrubber.

[0015] The ammonia treatment method for a floating body involved in the present invention is the ammonia treatment method for a floating body as described above. In the ammonia treatment method for a floating body, when the outflow of ammonia from the ammonia device provided in the floating body body is detected, the air scrubber is operated, and water is supplied to the vent while air inside and outside the vent is circulated.

[0016] Effects of the Invention

[0017] According to the floating body and the ammonia treatment method of the floating body of the present invention, it is possible to suppress the intrusion of ammonia into the internal space. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a side view of a floating body and an ammonia treatment method of a floating body according to an embodiment of the present invention.

[0019] Figure 2 It is a schematic structural diagram showing an air scrubber, a sensor, and a water treatment unit provided in a floating body according to an embodiment of the present invention.

[0020] Figure 3 It is a diagram showing the hardware configuration of a control device according to an embodiment of the present invention.

[0021] Figure 4 This is a functional block diagram of a control device according to an embodiment of the present invention.

[0022] Figure 5 This is a flowchart showing the steps of the ammonia treatment method of the floating body according to the embodiment of the present invention.

[0023] Figure 6 It is a schematic configuration diagram showing an air scrubber, a sensor, and a water treatment unit provided on a floating body according to a first modified example of the embodiment of the present invention.

[0024] Figure 7It is a schematic configuration diagram showing an air scrubber, a sensor, and a water treatment unit provided on a floating body according to a second modified example of the embodiment of the present invention. DETAILED DESCRIPTION

[0025] Below, reference Figure 1 to Figure 7 , the floating body and the ammonia treatment method of the floating body involved in the embodiment of the present invention are described.

[0026] (Structure of floating body)

[0027] like Figure 1 As shown, the floating body 1 of this embodiment includes a floating body 2, an upper structure 4 and an ammonia device 10. In addition, the floating body 1 of this embodiment is described by taking a ship that can navigate by a main engine, etc. as an example. The ship type of the floating body 1 is not limited to a specific ship type. As the ship type of the floating body 1, a liquefied gas tanker, a ferry, a RORO ship, a car tanker, a passenger ship, etc. can be exemplified. In this embodiment, the case where the floating body 1 is a ship is described, but the floating body 1 is not limited to a ship, and it can also be a FSU (Floating Storage Unit: floating storage device), FSRU (Floating Storage and Regasification Unit: floating storage and regasification device), etc. that cannot navigate by a main engine, etc.

[0028] The floating body 2 is formed to float in the seawater. The floating body 2 has a pair of sidewalls 5A and 5B constituting its outer shell and a bottom 6. The sidewalls 5A and 5B have a pair of side outer plates forming the port and starboard sides, respectively. The bottom 6 has a bottom outer plate connecting these sidewalls 5A and 5B. The outer shell of the floating body 2 is formed in a U-shape by the pair of sidewalls 5A and 5B and the bottom 6 in a cross section perpendicular to the bow and stern direction FA.

[0029] The floating body 2 also includes an upper deck 7 which is a full-through deck arranged at the uppermost layer. The upper structure 4 is formed on the upper deck 7. A living area and the like are provided in the upper structure 4. In the floating body 1 of the present embodiment, for example, a cargo hold (not shown) for loading cargo is provided at a position closer to the bow 2a side in the bow-stern direction FA than the upper structure 4.

[0030] Furthermore, the floating body 1 has an exhaust pipe 8 and a chimney 9, for example, at a position closer to the stern 2b side in the bow and stern direction FA than the superstructure 4. The exhaust pipe 8 discharges exhaust gas from an engine room provided in the floating body main body 2. The exhaust pipe 8 may also extend upward from the upper deck 7. The chimney 9 is provided on the upper deck 7. The exhaust pipe 8 extends upward through the chimney 9.

[0031] The ammonia plant 10 is installed in the floating body 2. The ammonia plant 10 is a plant for processing ammonia. In the present embodiment, the ammonia plant 10 is described as an example in which the ammonia plant 10 is an ammonia tank 11 storing ammonia. The ammonia plant 10 includes the ammonia tank 11 and the discharge unit 15.

[0032] The ammonia tank 11 is a storage tank for storing liquid ammonia (in other words, liquefied ammonia). The ammonia tank 11 is installed in the cargo hold in the floating body 2. In the present embodiment, a plurality of ammonia tanks 11 are installed at intervals in the bow and stern direction FA. In the present embodiment, three ammonia tanks 11 are installed at intervals in the bow and stern direction FA. In addition, there is no limitation on the number, configuration, shape, etc. of the ammonia tanks 11, and they can be changed appropriately.

[0033] The discharge portion 15 includes a safety valve 18 and a vent column 19 .

[0034] The safety valve 18 is respectively provided in the plurality of ammonia tanks 11. The safety valve 18 is provided in the middle of the connecting pipe 17 connecting the ammonia tank 11 and the vent column 19. The safety valve 18 is usually in a closed state, closing the flow path in the connecting pipe 17. When the pressure of ammonia in the interior of the ammonia device 10 becomes higher than a predetermined value, the safety valve 18 is in an open state, opening the flow path in the connecting pipe 17. When the safety valve 18 is in an open state, the ammonia in the interior of the ammonia device 10 is discharged to the outside of the ammonia device 10 through the connecting pipe 17.

[0035] The ventilation column 19 is provided on the upper deck 7. The ventilation column 19 is formed in a cylindrical shape extending in the vertical direction. The ventilation column 19 guides the ammonia discharged from the safety valve 18 to flow into the atmosphere. The ammonia discharged from the safety valve 18 is discharged from the opening 19a (refer to FIG. 1 ) formed at the upper end of the ventilation column 19. Figure 2 ) flows into the atmosphere.

[0036] Figure 2 It is a schematic structural diagram showing an air scrubber, a sensor, and a water treatment unit provided in a floating body according to an embodiment of the present invention.

[0037] like Figure 2 As shown, the floating body 1 further includes an air scrubber 20 , a water supply unit 30 , a water treatment unit 40 , a sensor 25 , and a control device 60 .

[0038] The air scrubber 20 is provided at the vent 100. The vent 100 is exposed on the outer surface of the floating body 1. The vent 100 is connected to the area inside the floating body 1. In the present embodiment, the vent 100 is provided, for example, at the superstructure 4. The vent 100 is provided to be exposed on the outer surface of the superstructure 4. The vent 100 is formed to connect the outside of the superstructure 4 with the area inside the superstructure 4 (living area). Specifically, the vent 100 is an air intake for ventilation and an air intake for an air conditioning system. The vent 100 may also be, for example, an openable and closable window, an openable and closable door, etc. Furthermore, the vent 100 may also be provided at other parts of the outer surface of the floating body 1, such as the chimney 9 connected to the cabin in the floating body 2.

[0039] The air washer 20 supplies water supplied from the water supply unit 30 to the vent 100. The air washer 20 can circulate air inside and outside the vent 100 and supply water to the vent 100. The air washer 20 includes a water supply nozzle 21 and a water recovery tray 22.

[0040] The water supply nozzle 21 is disposed, for example, above the vent 100. The water supply nozzle 21 supplies water supplied from the water supply unit 30 to the air flowing into the internal space of the area through the vent 100 from the outside of the upper structure 4 by spraying, jetting, dripping, etc. When the air containing ammonia reaches the vent 100, the water supplied from the water supply nozzle 21 contacts the ammonia contained in the air, thereby recovering (in other words, absorbing) the ammonia. The water containing ammonia falls downward due to its own weight.

[0041] In addition, as long as the air scrubber 20 can remove ammonia contained in the air flowing into the internal space within the area from the outside of the upper structure 4 through the ventilation port 100 by using water supplied from the water supply unit 30, it is not limited to spraying, injecting, dripping, etc. from the water supply nozzle 21, and it can also be any other method.

[0042] The water recovery tray 22 recovers water supplied from the water supply nozzle 21 by spraying, jetting, dripping, etc. The water recovery tray 22 is arranged below the water supply nozzle 21. The water recovery tray 22 is connected to the water treatment unit 40 via the water recovery pipe 23. The water recovered by the water recovery tray 22 is discharged to the water treatment unit 40 via the water recovery pipe 23.

[0043] The water supply unit 30 supplies water to the air scrubber 20. The water supply unit 30 includes a supply line 31, a pump 32, a first valve 36, and a second valve 37.

[0044] The supply pipe 31 supplies water from the outside to the water supply nozzle 21 of the air scrubber 20. One end of the supply pipe 31 is connected to the water supply nozzle 21. For example, water (e.g., clean water) stored in a water tank (not shown) provided in the floating body 2 or water (e.g., seawater) taken from the outside of the floating body is supplied to the supply pipe 31. In addition, the supply pipe 31 may also take water from a water supply system that supplies water (seawater) to an air conditioning system provided in the floating body 1. The pump 32 pressurizes and delivers water from the outside to the water supply nozzle 21 through the supply pipe 31.

[0045] The floating body 1 in this embodiment further includes a circulation line 35. The circulation line 35 can supply water recovered in a storage tank 41 of a water treatment unit 40 described later to the water supply unit 30. One end of the circulation line 35 joins and connects with the supply line 31 on the upstream side of the pump 32. The other end of the circulation line 35 is connected to the storage tank 41.

[0046] The first valve 36 is provided in the supply line 31. The first valve 36 is provided in the supply line 31 at the upstream side of the position where the supply line 31 is joined with one end of the circulation line 35. The first valve 36 intermittently takes in water from an external water tank or the sea into the supply line 31. The second valve 37 is provided in the circulation line 35. The second valve 37 intermittently circulates water from the storage tank 41.

[0047] The water supply unit 30 can switch the water supply source to the water supply nozzle 21 by opening and closing the first valve 36 and the second valve 37. The water supply unit 30 supplies clean water from a clean water tank (not shown) provided in the floating body 2 or seawater taken from the surroundings where the floating body 2 floats to the air scrubber 20 by opening the first valve 36 and closing the second valve 37. The water supply unit 30 supplies water circulated from the storage tank 41 of the water treatment unit 40 to the air scrubber 20 by closing the first valve 36 and opening the second valve 37.

[0048] The water treatment unit 40 recovers the used water used by the air scrubber 20. The water treatment unit 40 recovers the water recovered by the water recovery tray 22 and discharged through the water recovery pipe 23 as the used water used by the air scrubber 20. The water treatment unit 40 mainly includes a storage tank 41 and an ammonia treatment unit 42.

[0049] The storage tank 41 is provided in the floating body 2. The storage tank 41 recovers the used water used by the air scrubber 20. The storage tank 41 stores the recovered water. The configuration of the storage tank 41 is not limited to the above configuration as long as the used water can be recovered.

[0050] The ammonia treatment unit 42 treats ammonia contained in the used water recovered to the storage tank 41. The ammonia treatment unit 42 is a device that renders ammonia contained in the ammonia water harmless. The ammonia treatment unit 42 is not limited to a specific structure as long as it can treat ammonia contained in the used water.

[0051] The ammonia treatment unit 42 is connected to the storage tank 41 via a connecting pipe 43. The ammonia treatment unit 42 in the present embodiment decomposes ammonia contained in the used water introduced from the storage tank 41 through the connecting pipe 43, for example, by a denitrification reaction. The ammonia treatment unit 42 introduces seawater from the surrounding sea where the floating body 2 floats. The ammonia treatment unit 42 generates a seawater electrolyte containing sodium hypochlorite by electrolyzing the introduced seawater. Specifically, a positive electrode and a negative electrode (not shown) are arranged in the introduced seawater and a voltage is applied between the positive electrode and the negative electrode, thereby electrolyzing the seawater. Through this electrolysis, sodium hypochlorite is generated from the seawater.

[0052] The ammonia treatment unit 42 mixes the seawater electrolyte generated by electrolysis with the used water introduced from the storage tank and reacts them. More specifically, as shown in formula (1), the ammonia treatment unit 42 reacts the ammonia (2NH 3 ) reacts with sodium hypochlorite (3NaClO) in seawater electrolyte under acidic conditions and decomposes into nitrogen (N 2 ), sodium chloride (3NaCl) and water (3H 2 O).

[0053] 2NH 3 +3NaClO=>N 2 +3NaCl+3H 2 O……(1)

[0054] The nitrogen generated by the denitrification reaction in the ammonia treatment section 42 is discharged into the atmosphere, for example, via a chimney 9 extending from the upper deck 7. On the other hand, the sodium chloride and water generated by the denitrification reaction are discharged as treated liquid to a discharge section 44 connected to the ammonia treatment section 42. The discharge section 44 discharges the treated liquid into the surrounding seawater where the floating body 2 floats.

[0055] Furthermore, the floating body 1 in this embodiment can supply water in which ammonia has been treated (detoxified) by the ammonia treatment unit 42 to the water supply unit 30. Therefore, the floating body 1 is provided with a treated water circulation line 45. The treated water circulation line 45 circulates the water in which ammonia has been treated by the ammonia treatment unit 42 in the storage tank 41. As a result, the concentration of ammonia contained in the water in the storage tank 41 is reduced. In the circulation line 35, the water in the storage tank 41 in which the concentration of ammonia has been reduced is supplied to the water supply unit 30.

[0056] The treated water circulation line 45 may supply water obtained by treating (detoxifying) ammonia in the ammonia treatment unit 42 to the water supply unit 30 via another treated water tank (not shown) instead of the tank 41 .

[0057] The sensor 25 can detect the outflow of ammonia from the ammonia device 10 into the atmosphere. The sensor 25 detects, for example, that ammonia is discharged from the discharge portion 15. The sensor 25 can be arranged, for example, in the vent column 19. When the pressure of ammonia inside the ammonia device 10 becomes equal to or higher than a predetermined value, the sensor 25 detects ammonia discharged from the safety valve 18 into the vent column 19. When the concentration of ammonia contained in the air (atmosphere) in the vent column 19 becomes equal to or higher than a predetermined threshold value, the sensor 25 outputs a signal indicating that ammonia is detected to the control device 60.

[0058] When the sensor 25 detects the outflow of ammonia, the control device 60 operates the air scrubber 20 .

[0059] (Hardware structure diagram)

[0060] Figure 3 It is a diagram showing the hardware configuration of a control device according to an embodiment of the present invention.

[0061] like Figure 3 As shown, the control device 60 is a computer including a CPU 61 (Central Processing Unit), a ROM 62 (Read Only Memory), a RAM 63 (Random Access Memory), a memory 64 such as a HDD (Hard Disk Drive), and a signal transceiver module 65 .

[0062] (Functional Block Diagram)

[0063] Figure 4 This is a functional block diagram of a control device according to an embodiment of the present invention.

[0064] like Figure 4 As shown, the CPU 61 of the control device 60 implements the functional configurations of the signal receiving unit 71 , the air scrubber control unit 72 , and the command signal output unit 73 by executing a program stored in the ROM 62 or the memory 64 .

[0065] The signal receiving unit 71 receives the detection signal from the sensor 25 via the signal transceiver module 65 which is hardware.

[0066] The air scrubber control unit 72 controls the operation of the air scrubber 20 based on the detection signal from the sensor 25. When the outflow of ammonia is detected by the sensor 25, the air scrubber control unit 72 operates the air scrubber 20. When the outflow of ammonia is not detected by the sensor 25 (non-detection), the air scrubber control unit 72 stops the operation of the air scrubber 20. The air scrubber control unit 72 controls the operation of the air scrubber 20 by controlling the operation of the pump 32, for example.

[0067] When the outflow of ammonia is detected by the sensor 25, the command signal output unit 73 outputs the command signal for operating the air scrubber 20 outputted from the air scrubber control unit 72 to the air scrubber 20. When the outflow of ammonia is not detected by the sensor 25 (non-detection), the command signal output unit 73 outputs the command signal for stopping the operation of the air scrubber 20 to the air scrubber 20.

[0068] (Steps of ammonia treatment method for floating body 1)

[0069] Figure 5 FIG. 1 is a flow chart showing the steps of a method for treating a floating body with ammonia according to an embodiment of the present invention. Figure 5 As shown, the ammonia treatment method S10 of the floating body 1 according to the embodiment of the present invention includes a step S11 of confirming detection of ammonia, a step S12 of operating the air scrubber, a step S13 of confirming non-detection of ammonia, and a step S14 of stopping the air scrubber.

[0070] In step S11 of confirming the detection of ammonia, the air scrubber control unit 72 of the control device 60 confirms whether the outflow of ammonia from the ammonia device 10 to the atmosphere is detected by the sensor 25. If the pressure of ammonia inside the ammonia device 10 becomes equal to or higher than a predetermined value and the safety valve 18 is opened, the sensor 25 detects the outflow of ammonia from the ammonia device 10 to the atmosphere through the vent column 19. When the concentration of ammonia contained in the air (atmosphere) in the vent column 19 becomes equal to or higher than a preset threshold value, the sensor 25 outputs a signal indicating the detection of ammonia to the control device 60. The output signal is received by the signal receiving unit 71.

[0071] In step S11 , when the signal receiving unit 71 does not receive a signal indicating detection of ammonia from the sensor 25 (“No” in step S11 ), the process returns to step S11 and step S11 is repeated at preset time intervals.

[0072] In step S11 , when the signal receiving unit 71 receives a signal indicating that ammonia has been detected from the sensor 25 , the air scrubber control unit 72 determines that ammonia has been detected (YES in step S11 ), and proceeds to step S12 .

[0073] In step S12 of operating the air scrubber, the air scrubber control unit 72 operates the air scrubber 20. The air scrubber control unit 72 operates the pump 32 to supply water from the water supply unit 30 to the air scrubber 20. When the pump 32 is operated, water is supplied from the water supply nozzle 21 to the vent 100 through the water supply unit 30. Thus, when ammonia flowing out of the ventilation column 19 reaches the vent 100 together with the air (atmosphere), the ammonia contained in the atmosphere can be absorbed by the water.

[0074] In step S13 of confirming the non-detection of ammonia, the air scrubber control unit 72 of the control device 60 confirms whether the outflow of ammonia from the ammonia plant 10 to the atmosphere is no longer detected (non-detected) from the sensor 25. After the safety valve 18 is opened, if the pressure of ammonia inside the ammonia plant 10 becomes less than a predetermined value, the safety valve 18 is closed. If the safety valve 18 is closed and the concentration of ammonia contained in the air (atmosphere) in the vent column 19 detected by the sensor 25 becomes less than a preset threshold value, the sensor 25 does not output a signal indicating the detection of ammonia.

[0075] In step S13 , when the signal receiving unit 71 receives a signal indicating that ammonia has been detected from the sensor 25 (“No” in step S13 ), the process returns to step S12 and the air scrubber 20 continues to operate.

[0076] In step S13 , if the signal receiving unit 71 is in a state where it has not received a signal indicating detection of ammonia from the sensor 25 (non-detection) (YES in step S13 ), the process proceeds to step S14 .

[0077] In step S14 of stopping the air scrubber, the air scrubber control unit 72 stops the operation of the air scrubber 20. The air scrubber control unit 72 stops the operation of the pump 32 that supplies water to the air scrubber 20. When the operation of the pump 32 stops, the water supply to the water supply nozzle 21 stops.

[0078] (Effect)

[0079] In the floating body 1 and the ammonia treatment method S10 of the floating body 1 of the above-mentioned embodiment, an air scrubber 20 capable of circulating air inside and outside the vent 100 and supplying water to the vent 100 is provided at the vent 100. When the sensor 25 detects the outflow of ammonia from the ammonia device 10 into the atmosphere, the control device 60 operates the air scrubber 20. If the air scrubber 20 is operated, the water supplied by the water supply unit 30 is supplied to the vent 100. As a result, the ammonia contained in the air circulating in the vent 100 is absorbed by the water. The used water used by the air scrubber 20 and absorbing the ammonia is recovered by the water treatment unit 40. Therefore, the intrusion of ammonia into the internal space through the vent 100 can be suppressed.

[0080] Furthermore, in the above-mentioned embodiment, when the pressure of ammonia in the interior of the ammonia plant 10 becomes equal to or greater than a predetermined value, ammonia in the interior of the ammonia plant 10 is discharged from the discharge unit 15 to the outside of the ammonia plant 10. Furthermore, when the sensor 25 detects the outflow of ammonia into the atmosphere, the ammonia contained in the air flowing through the vent 100 is absorbed by water by operating the air scrubber 20. Therefore, when ammonia flows out from the ammonia plant 10 into the atmosphere, it is possible to suppress ammonia from flowing from the vent 100 into the interior space of a residential area or the like. Furthermore, when ammonia does not flow out into the atmosphere, since the operation of the air scrubber 20 is stopped, energy saving can be achieved.

[0081] Furthermore, in the above-mentioned embodiment, in the structure in which ammonia in the ammonia device 10 is discharged to the outside of the ammonia device 10 through the safety valve 18 when the pressure of ammonia in the ammonia device 10 becomes equal to or higher than a predetermined value, the sensor 25 is provided in the vent column 19. Therefore, when ammonia discharged from the safety valve 18 flows out to the atmosphere through the vent column 19, the pressure can be detected by the sensor 25. Therefore, for example, compared with the case where the sensor 25 is provided near the vent 100, the discharge of ammonia from the safety valve 18 can be detected earlier. Furthermore, in the vent column 19, the ammonia concentration is higher than that in the atmosphere outside the vent column 19. Therefore, the outflow of ammonia to the atmosphere can be detected more reliably by the sensor 25.

[0082] Furthermore, in the above-mentioned embodiment, the used water used by the air scrubber 20 is recovered by the storage tank 41. Therefore, it is possible to suppress the water that has absorbed ammonia from flowing onto the upper deck and diffusing into the surrounding seawater where the floating body 2 floats. Furthermore, in the above-mentioned embodiment, the ammonia contained in the water recovered to the storage tank 41 is processed by the ammonia processing unit 42. Thus, the space inside the floating body 1 for storing the water that has absorbed ammonia can be reduced.

[0083] Furthermore, in the above-mentioned embodiment, the water recovered in the storage tank 41 is supplied from the water supply unit 30 to the air scrubber 20 through the circulation line 35. Therefore, the water recovered in the storage tank 41 can be reused, so that the storage tank 41 can be miniaturized. Furthermore, the amount of water newly taken in from the outside for supplying from the water supply unit 30 to the air scrubber 20 can be suppressed.

[0084] Furthermore, in the above-described embodiment, when the concentration of ammonia detected by the sensor 25 becomes equal to or higher than a preset threshold value, a signal indicating detection of ammonia is output, but the present invention is not limited thereto.

[0085] For example, when the concentration of ammonia becomes equal to or higher than a preset threshold value, the sensor 25 may detect the concentration of ammonia contained in the air and output the detection result to the control device 60 .

[0086] In this case, the control device 60 may control the rotation speed of the pump 32 and the like according to the concentration of ammonia detected by the sensor 25 , and control the amount of water supplied from the water supply unit 30 to the air scrubber 20 .

[0087] In this way, the amount of water supplied to the air scrubber 20 is controlled according to the ammonia concentration in the atmosphere detected by the sensor 25, and when the ammonia concentration in the atmosphere is low, the amount of water supplied to the air scrubber 20 is reduced, thereby appropriately controlling the amount of water supplied.

[0088] <Modification of the embodiment>

[0089] As mentioned above, the embodiment of the present invention has been described in detail with reference to the drawings, but the specific structure is not limited to this embodiment, and design changes and the like are included within the scope that does not depart from the gist of the present invention.

[0090] (First Modification of Embodiment)

[0091] Figure 6 It is a schematic configuration diagram showing an air scrubber, a sensor, and a water treatment unit provided on a floating body according to a first modified example of the embodiment of the present invention.

[0092] like Figure 6 As shown, the floating body 1 is further provided with an environment detection unit 80 for detecting the environment around the floating body main body 2. The environment around the floating body main body 2 detected by the environment detection unit 80 is information indicating the environmental conditions around the floating body main body 2 that may affect the state of ammonia reaching the vent 100. In the environment detection unit 80, as information indicating the environment, for example, wind direction, temperature, weather, etc. are detected.

[0093] The control device 60B of the floating body 1 in the first modified example of this embodiment controls the amount of water supplied from the water supply unit 30 to the air scrubber 20 based on the detection results of the sensor 25 and the detection results of the surrounding environment detection unit 80 .

[0094] When ammonia flows out from the ammonia equipment 10, the arrival condition of the ammonia flowing out to the vent 100 may change depending on the surrounding environment of the floating body 2, such as wind direction, temperature, and weather. Therefore, the surrounding environment of the floating body 2 is detected by the surrounding environment detection unit 80, and the control device 60B controls the supply amount of water to the air scrubber 20 based on the detection result of the surrounding environment detection unit 80 in addition to the detection result of the sensor 25. In the air scrubber control unit 72 of the control device 60B, the diffusion state of the flowing out ammonia can also be predicted based on the detection result of the surrounding environment detection unit 80 and a pre-set program.

[0095] Thus, the air scrubber control unit 72 can increase or decrease the amount of water supplied to the air scrubber 20 according to the arrival condition at the vent 100. The air scrubber control unit 72 controls the amount of water supplied to the air scrubber 20, for example, by reducing the amount of water supplied to the air scrubber 20 when it is determined based on the wind direction that the outflowing ammonia is difficult to reach the vent 100, and increasing the amount of water supplied to the air scrubber 20 when it is determined that the outflowing ammonia is easy to reach the vent 100.

[0096] (Second Modification of Embodiment)

[0097] Figure 7 It is a schematic configuration diagram showing an air scrubber, a sensor, and a water treatment unit provided on a floating body according to a second modified example of the embodiment of the present invention.

[0098] like Figure 7 As shown, the floating structure 1 further includes an opening and closing unit 90 capable of closing the vent 100. Examples of the opening and closing unit 90 include a damper or a gate provided at the vent 100.

[0099] In this case, when the sensor 25 detects the outflow of ammonia, the control device 60C of the floating body 1 closes the vent 100 through the opening and closing unit 90. Then, the control device 60C opens the vent 100 through the opening and closing unit 90 after the air scrubber 20 operates and starts supplying water to the vent 100.

[0100] Thus, when the sensor 25 detects the outflow of ammonia, the vent 100 is closed by the opening and closing portion 90, thereby quickly suppressing the intrusion of ammonia from the vent 100 to the area inside the floating body 1. Furthermore, after the air scrubber 20 is operated and water starts to be supplied to the vent 100, the vent 100 is opened by the opening and closing portion 90, thereby suppressing the intrusion of ammonia in the vent 100 by the operation of the air scrubber 20, and allowing the air inside and outside the vent 100 to circulate, thereby enabling ventilation.

[0101] (Other Implementations)

[0102] As mentioned above, the embodiment of the present invention has been described in detail with reference to the drawings, but the specific structure is not limited to this embodiment, and design changes and the like are included within the scope that does not depart from the gist of the present invention.

[0103] In the above embodiment, the ammonia equipment 10 is provided with the ammonia tank 11 for storing ammonia, but the present invention is not limited thereto. The ammonia equipment 10 may also include, for example, a device that uses ammonia as fuel. In this case, when the pressure of ammonia in the ammonia fuel system, the pressure of ammonia inside the region where the device that uses ammonia as fuel is accommodated, etc., becomes equal to or greater than a predetermined value, the discharge unit 15 discharges ammonia from the ammonia equipment 10 into the atmosphere. Furthermore, when purging with an inert gas that does not react with ammonia is performed, the discharge unit 15 may discharge the remaining ammonia together with the inert gas.

[0104] Furthermore, in the above-mentioned embodiment and each modified example of the embodiment, the sensor 25 is arranged in the ventilation column 19, and the ammonia discharged from the safety valve 18 is detected by the sensor 25, and the control device 60 controls the operation of the air scrubber 20 according to the detection result. However, it is not limited to such a configuration of the sensor 25. For example, in order to detect ammonia leaking (flowing out) from the ammonia device 10 to the atmosphere without passing through the ventilation column 19, a sensor (not shown) that can detect ammonia around the vent 100 can be arranged outside the ventilation column 19, and the control device 60 controls the operation of the air scrubber 20 according to the detection result of the sensor.

[0105] Furthermore, the control device 60 may control the operation of the air scrubber 20 based on the detection results of both the sensor capable of detecting ammonia around the vent 100 and the sensor 25 disposed in the vent column 19 .

[0106] In this case, the ammonia concentration can be detected by a sensor that detects ammonia leaking (flowing out) into the atmosphere, and when the control device 60 determines that the ammonia concentration is equal to or higher than a preset threshold value, the air scrubber 20 may be operated.

[0107] Furthermore, in the above-mentioned embodiment and each modification of the embodiment, the case where the sensor 25 can detect the ammonia concentration is described, but the sensor is not limited to the sensor that can detect the ammonia concentration as long as it can detect the outflow of ammonia from the ammonia device 10 into the atmosphere. For example, it can also be a sensor that detects the opening of the safety valve 18.

[0108] Furthermore, in the above-mentioned embodiment and each modification of the embodiment, the air scrubber 20 is set in the vent 100 exposed on the outer surface of the floating body 1, but the setting position and setting method of the air scrubber 20 are not limited thereto. The air scrubber 20 may also be set in the floating body 1 and arranged in a semi-enclosed area such as an air intake chamber that can communicate with the outside of the floating body 1.

[0109] <Note>

[0110] The floating body 1 and the ammonia treatment method S10 of the floating body 1 described in the embodiment can be understood, for example, as follows.

[0111] (1) The float 1 involved in the first embodiment comprises: a float body 2; an ammonia device 10, which is arranged on the float body 2; a vent 100, which is exposed on the outer surface of the float body 2 and is connected to the area inside the float body 2; an air scrubber 20, which is arranged on the vent 100 and can allow air to circulate inside and outside the vent 100 and supply water to the vent 100; a water supply unit 30, which supplies the water to the scrubber 20; a sensor 25, which can detect the outflow of ammonia from the ammonia device 10 to the atmosphere; a control device 60, 60B, 60C, which operates the air scrubber 20 when the outflow of ammonia is detected by the sensor 25; and a water treatment unit 40, which recovers the used water used by the air scrubber 20.

[0112] Examples of the floating body 1 include ships such as a liquefied gas tanker, a ferry, a RORO ship, a car tanker, and a passenger ship, an FSU (Floating Storage Unit), and an FSRU (Floating Storage and Regasification Unit).

[0113] Examples of outflow of ammonia into the atmosphere include discharge from the safety valve 18 through the vent column 19 and leakage from the ammonia plant 10 .

[0114] The float 1 ventilates the area inside the float 1 through the vent 100. The vent 100 is provided with an air scrubber 20 that can circulate air inside and outside the vent 100 and supply water to the vent 100. When the sensor 25 detects the outflow of ammonia from the ammonia device 10 to the atmosphere, the control devices 60, 60B, 60C operate the air scrubber 20. If the air scrubber 20 is operated, the water supplied by the water supply unit 30 is supplied to the vent 100. As a result, the ammonia contained in the air circulating in the vent 100 is absorbed by the water. The used water used by the air scrubber 20 and absorbing the ammonia is recovered by the water treatment unit 40. Therefore, the intrusion of ammonia into the internal space through the vent 100 can be suppressed.

[0115] (2) The float 1 according to the second embodiment is the float 1 according to (1), further comprising a discharge unit 15 for discharging the ammonia from the ammonia plant 10 into the atmosphere when the pressure of the ammonia inside the ammonia plant 10 becomes equal to or higher than a predetermined value, and the sensor 25 detects that the ammonia is discharged from the discharge unit 15.

[0116] Thus, when the pressure of ammonia in the ammonia plant 10 becomes equal to or higher than a predetermined value, ammonia in the ammonia plant 10 is discharged from the discharge unit 15 to the outside of the ammonia plant 10. When the sensor 25 detects the outflow of ammonia into the atmosphere, the air scrubber 20 is operated so that ammonia contained in the air flowing through the vent 100 is absorbed by water.

[0117] (3) The float 1 according to the third embodiment is the float 1 according to (2), wherein the discharge unit 15 comprises: a safety valve 18 for discharging the ammonia in the ammonia device 10 to the outside of the ammonia device 10 when the pressure of the ammonia in the ammonia device 10 becomes equal to or higher than a predetermined value; and a vent column 19 for guiding the ammonia discharged from the safety valve 18 to flow into the atmosphere.

[0118] The sensor 25 is disposed in the ventilation column 19 .

[0119] Thus, when the pressure of ammonia in the ammonia plant 10 reaches a predetermined value or more, the safety valve 18 discharges ammonia in the ammonia plant 10 to the outside of the ammonia plant 10. The ammonia discharged from the safety valve 18 flows through the vent column 19 into the atmosphere.

[0120] Furthermore, since the sensor 25 is disposed in the vent column 19, for example, the emission of ammonia from the safety valve 18 can be detected earlier than when the sensor 25 is disposed near the vent 100. Furthermore, since the ammonia concentration in the vent column 19 is higher than that in the atmosphere, the outflow of ammonia into the atmosphere can be detected more reliably by the sensor 25.

[0121] (4) The float 1 involved in the fourth embodiment is any one of the floats 1 (1) to (3), wherein the water treatment unit 40 comprises: a storage tank 41 for recovering the water used by the air scrubber 20; and an ammonia treatment unit 42 for treating the ammonia contained in the water recovered to the storage tank 41.

[0122] Thus, the used water used by the air scrubber 20 is recovered by the storage tank 41. Therefore, it is possible to suppress the water that has absorbed ammonia from, for example, flowing onto the upper deck and diffusing from the upper deck into the seawater. Furthermore, the ammonia treatment unit 42 treats the ammonia contained in the water recovered into the storage tank 41. Thus, the space for storing the water that has absorbed ammonia in the floating body 1 can be reduced.

[0123] (5) The floating body 1 according to the fifth aspect is the floating body 1 according to (4), further comprising a circulation line 35 capable of supplying the water recovered in the storage tank 41 to the water supply unit 30 , and the water supply unit 30 capable of supplying the water recovered in the storage tank 41 to the air scrubber 20 .

[0124] Thus, the water recovered in the storage tank 41 can be supplied from the water supply unit 30 to the air scrubber 20 through the circulation line 35 and reused, so that the storage tank 41 can be miniaturized and the amount of water newly taken in from the outside for supply to the air scrubber 20 can be suppressed. In this case, for example, as long as the water supplied to the air scrubber 20 includes water treated by the ammonia treatment unit 42 provided in the floating body 1 after being recovered from the storage tank 41, the concentration of ammonia contained in the water supplied to the air scrubber 20 can be suppressed.

[0125] (6) The float 1 involved in the sixth embodiment is any one of the floats 1 from (1) to (5), which further includes an ambient environment detection unit 80 for detecting the ambient environment of the float body 2, and the control device 60B controls the amount of water supplied from the water supply unit 30 to the air scrubber 20 based on the detection results of the sensor 25 and the detection results of the ambient environment detection unit 80.

[0126] When ammonia flows out from the ammonia equipment 10 into the atmosphere, the arrival of the ammonia flowing out to the vent 100 may change depending on the surrounding environment of the floating body 2, such as wind direction, temperature, and weather. Therefore, the surrounding environment of the floating body 2 is detected by the surrounding environment detection unit 80, and the control device 60B controls the supply amount of water to the air scrubber 20 in addition to the detection result of the sensor 25, and thus the supply amount of water to the air scrubber 20 can be increased or decreased according to the arrival condition of the ammonia flowing out to the vent 100. For example, if the ammonia flowing out is in a condition that it is difficult to reach the vent 100 due to the wind direction, etc., the supply amount of water to the air scrubber 20 is reduced, etc., so that the supply amount of water can be appropriately controlled.

[0127] Examples of the surrounding environment include information indicating wind direction, temperature, weather, and the like.

[0128] (7) The float 1 involved in the seventh embodiment is any one of the floats 1 (1) to (6), wherein the sensor 25 is capable of detecting the ammonia concentration in the atmosphere, and the control device 60, 60B, 60C controls the supply amount of the water supplied by the water supply unit 30 to the air scrubber 20 according to the ammonia concentration detected by the sensor 25.

[0129] Thus, the amount of water supplied to the air scrubber 20 is controlled according to the ammonia concentration in the atmosphere detected by the sensor 25, and when the ammonia concentration in the atmosphere is low, the amount of water supplied to the air scrubber 20 is reduced, thereby appropriately controlling the amount of water supplied.

[0130] (8) The float 1 involved in the eighth embodiment is any one of the floats 1 from (1) to (7), which further includes an opening and closing portion 90 capable of closing the vent 100, and when the sensor 25 detects the outflow of ammonia, the control device 60C closes the vent 100 through the opening and closing portion 90, and after the air scrubber 20 starts to operate and starts to supply water to the vent 100, the control device 60C opens the vent 100 through the opening and closing portion 90.

[0131] Thus, when the sensor 25 detects the outflow of ammonia, the vent 100 is closed by the opening and closing portion 90, thereby quickly suppressing the intrusion of ammonia from the vent 100 to the area inside the floating body 1. Furthermore, after the air scrubber 20 is operated and water starts to be supplied to the vent 100, the vent 100 is opened by the opening and closing portion 90, thereby suppressing the intrusion of ammonia in the vent 100 by the operation of the air scrubber 20, and allowing the air inside and outside the vent 100 to circulate, thereby enabling ventilation.

[0132] (9) The ammonia treatment method S10 of the float 1 involved in the ninth embodiment is any one of the ammonia treatment methods S10 of the float 1 among (1) to (8), wherein, when the outflow of ammonia from the ammonia device 10 provided on the float body 2 is detected, the air scrubber 20 is operated, and water is supplied to the vent 100 while air inside and outside the vent 100 is circulated.

[0133] Thus, when the sensor 25 detects the outflow of ammonia from the ammonia plant 10 into the atmosphere, the ammonia contained in the air flowing through the vent 100 is absorbed by water through the air scrubber 20. Therefore, the intrusion of ammonia passing through the vent 100 into the internal space can be suppressed.

[0134] Industrial Applicability

[0135] According to the floating body and the ammonia treatment method of the floating body of the present invention, it is possible to suppress the intrusion of ammonia into the internal space.

[0136] Explanation of symbols

[0137] 1- floating body, 2- floating body body, 2a- bow, 2b- stern, 4- superstructure, 5A, 5B- side, 6- bottom, 7- upper deck, 8- exhaust pipe, 9- chimney, 10- ammonia equipment, 11- ammonia tank, 15- discharge part, 17- connecting pipe, 18- safety valve, 19- ventilation column, 19a- opening, 20- air scrubber, 21- water supply nozzle, 22- water recovery tray, 23- water recovery pipe, 25- sensor, 30- water supply part, 31- supply pipeline, 32- pump, 35- circulation pipeline, 36- first valve, 37- second valve, 40- water treatment part, 41- storage tank, 42- ammonia treatment part, 43 -connecting pipe, 44-discharge part, 45-processed water circulation pipeline, 60, 60B, 60C-control device, 61-CPU, 62-ROM, 63-RAM, 64-memory, 65-signal transceiver module, 71-signal receiving part, 72-air scrubber control part, 73-command signal output part, 80-surrounding environment detection part, 90-opening and closing part, 100-ventilation port, FA-fore and stern direction, S10-ammonia treatment method of floating body, S11-step of confirming detection of ammonia, S12-step of operating the air scrubber, S13-step of confirming non-detection of ammonia, S14-step of stopping the air scrubber.

Claims

1. A floating body, comprising: floating body main body; an ammonia device, arranged on the floating body; a vent, exposed on the outer surface of the float body and communicating with an area inside the float body; an air scrubber, disposed at the vent, capable of circulating air inside and outside the vent and supplying water to the vent; a water supply unit for supplying the water to the air scrubber; a sensor capable of detecting the outflow of ammonia from the ammonia device into the atmosphere; a control device that operates the air scrubber when the outflow of ammonia is detected by the sensor; and The water treatment unit recovers the used water used by the air scrubber.

2. The floating body according to claim 1, further comprising: a discharge unit that discharges the ammonia from the ammonia plant into the atmosphere when the pressure of the ammonia in the interior of the ammonia plant becomes equal to or higher than a predetermined value, The sensor detects that the ammonia is discharged from the discharge portion.

3. The floating body according to claim 2, wherein: The discharge unit comprises: a safety valve that discharges the ammonia in the ammonia plant to the outside of the ammonia plant when the pressure of the ammonia in the ammonia plant becomes equal to or higher than a predetermined value; and a vent column for guiding the ammonia discharged from the safety valve to flow out to the atmosphere, The sensor is arranged in the ventilation column.

4. The floating body according to claim 1 or 2, wherein: The water treatment unit comprises: a storage tank for recovering said used water used by said air scrubber; and The ammonia treatment unit treats ammonia contained in the water recovered in the storage tank.

5. The floating body according to claim 4, comprising: a circulation pipeline capable of supplying the water recovered in the storage tank to the water supply unit, The water supply unit may supply the water recovered in the storage tank to the air scrubber.

6. The floating body according to claim 1 or 2, further comprising: A surrounding environment detection unit detects the surrounding environment of the floating body. The control device controls the amount of water supplied from the water supply unit to the air scrubber based on the detection result of the sensor and the detection result of the surrounding environment detection unit.

7. The floating body according to claim 1 or 2, wherein: The sensor is capable of detecting the concentration of ammonia in the atmosphere. The control device controls the amount of water supplied from the water supply unit to the air scrubber based on the concentration of ammonia detected by the sensor.

8. The floating body according to claim 1 or 2, further comprising: an opening and closing portion capable of closing the vent, The control device closes the vent opening via the opening and closing portion when the sensor detects the outflow of ammonia, and opens the vent opening via the opening and closing portion after the air scrubber operates to start supplying water to the vent opening.

9. An ammonia treatment method, which is the ammonia treatment method for a floating body according to claim 1 or 2, wherein: When outflow of ammonia from the ammonia equipment provided in the floating body is detected, the air scrubber is operated to supply water to the vent while circulating air inside and outside the vent.

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