Floating body

Abstract

To provide a floating body capable of removing ammonia while suppressing the increase of the burden on a worker and of fuel consumption.SOLUTION: A floating body comprises a floating main body, an absorption tank provided in the floating main body and for storing absorbent capable of absorbing ammonia, an atmospheric releasing line capable of releasing a gas phase in the absorption tank to the atmosphere, an ammonia introducing part to introduce the ammonia in the floating main body to the absorbent, and a solubility adjustment part capable of adjusting the solubility of the ammonia in the absorbent.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a floating body.

Background Art

[0002] In floating bodies such as ships, when transporting and supplying ammonia as fuel for a power generation facility or using ammonia as fuel for a main engine or the like, there is a possibility of ammonia leakage in compartments such as an equipment room that houses equipment for handling ammonia. When ammonia leakage occurs in such a compartment, it is assumed that the leaked ammonia vaporizes and leaks outside the compartment. Patent Document 1 proposes a technique for preventing ammonia from leaking outside the compartment by providing a sealed duct communicating with the inside of the compartment, spraying water in this duct, absorbing ammonia in the water in the duct, and creating a negative pressure inside the compartment. In this Patent Document 1, the water that has absorbed ammonia is returned to a water tank and circulated to the water spray nozzles again, or discharged to another treatment facility.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in a floating body, it may be necessary to switch between ammonia and other fuels such as light oil. When switching fuels in this way, purging is performed with an inert gas that does not react with ammonia to discharge the ammonia remaining in the ammonia fuel system. Therefore, there are cases where the remaining ammonia is discharged in a large amount in a short period of time. In this case, if we try to absorb and remove ammonia in water as in Patent Document 1, the required amount of water increases as the amount of discharged ammonia increases. However, since the space inside the floating body is limited, there are cases where a storage place for a large amount of water that has absorbed ammonia cannot be secured. And since it may affect the environment, the water containing ammonia cannot be directly discharged into the water around the floating body. Therefore, it is desired to detoxify the water that has absorbed ammonia on the floating body.

[0005] As a method for removing ammonia from the water that has absorbed ammonia, for example, there is a method using an acid such as dilute sulfuric acid. However, acids such as dilute sulfuric acid may be difficult to obtain at ports of call or mooring locations, etc., and there is also a problem that the burden on workers increases because they require skill in handling. Furthermore, the highly concentrated ammonia discharged by purging can also be detoxified by burning it without absorbing it in water. However, since the purging of ammonia occurs irregularly and needs to be completed in a short time, the combustion device requires a constant pilot flame, resulting in an increase in fuel consumption. The present disclosure has been made to solve the above problems, and an object thereof is to provide a floating body capable of detoxifying an absorption liquid that has absorbed ammonia while suppressing an increase in the burden on workers and fuel consumption.

Means for Solving the Problems

[0006] In order to solve the above problems, the following configuration is adopted. The floating body according to the present disclosure includes a floating body main body that floats on water, an absorption tank provided in the floating body main body and storing an absorption liquid capable of absorbing ammonia, an air release line that can release the gas phase in the absorption tank to the atmosphere, an ammonia introduction part that introduces ammonia in the floating body main body into the absorption liquid stored in the absorption tank, and a solubility adjustment part that can adjust the solubility of ammonia in the absorption liquid. A combustion device that uses the ammonia as fuel, a fuel tank that stores the ammonia as fuel, a fuel line that supplies the ammonia from the fuel tank to the combustion device, a purge gas supply device that supplies a purge gas into the fuel line, and a purge discharge line that discharges the ammonia in the fuel line pressed by the purge gas. The ammonia introduction part introduces the ammonia discharged by the purge discharge line into the absorption liquid. is. Furthermore, the floating body according to the present disclosure includes a floating body main body that floats on water, an absorption tank provided in the floating body main body and storing an absorption liquid capable of absorbing ammonia, an air release line that can open the gas phase in the absorption tank to the atmosphere, an ammonia introduction part that introduces the ammonia in the floating body main body into the absorption liquid stored in the absorption tank, and a solubility adjustment part that can adjust the solubility of the ammonia in the absorption liquid. The floating body main body includes a compartment that houses ammonia-related equipment and can introduce outside air. The ammonia introduction part introduces the gas in the compartment into the absorption liquid.

Advantages of the Invention

[0007] According to the floating body of the above aspect, ammonia can be removed while suppressing an increase in the burden on workers and fuel consumption.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Modes for Carrying Out the Invention

[0009] [First Embodiment] Hereinafter, the floating body according to the first embodiment of the present disclosure will be described with reference to the drawings. FIG. 1 is a side view of the floating body according to the first embodiment of the present disclosure. (Configuration of the floating body) As shown in FIG. 1, the floating body 1 of this embodiment includes a floating body main body 2, an upper structure 4, a combustion device 8, an ammonia tank (fuel tank) 10, a piping system (fuel line) 20, a compartment 30, and an ammonia decontamination device 60. Note that the floating body 1 of this embodiment will be described by taking a ship that can navigate by a main engine or the like as an example. The ship type of the floating body 1 is not limited to a specific ship type. Examples of the ship type of the floating body 1 include a liquefied gas carrier, a ferry, a RORO ship, an automobile carrier, a passenger ship, and the like.

[0010] The floating body main body 2 has a pair of side hulls 5A and 5B forming its outer shell and a bottom hull 6. The side hulls 5A and 5B include a pair of side shell plates forming the left and right side hulls respectively. The bottom hull 6 includes a bottom shell plate connecting these side hulls 5A and 5B. By these pair of side hulls 5A and 5B and the bottom hull 6, the outer shell of the floating body main body 2 forms a U shape in a cross section orthogonal to the fore-and-aft direction FA of the ship.

[0011] The floating body main body 2 further includes an upper deck 7 which is an all-through deck arranged at the uppermost layer. The upper structure 4 is formed on this upper deck 7. Living quarters and the like are provided in the upper structure 4. In the floating body 1 of this embodiment, for example, a cargo space (not shown) for loading cargo is provided on the bow 3a side in the fore-and-aft direction FA of the ship rather than the upper structure 4.

[0012] The combustion device 8 is a device that generates thermal energy by burning fuel, and is provided in the floating body main body 2 described above. Examples of the combustion device 8 include an internal combustion engine used for the main engine for propelling the floating body 1, an internal combustion engine used for a power generation facility for supplying electricity to the ship, a boiler for generating steam as a working fluid, and the like. The combustion device 8 of this embodiment can switch between using ammonia as fuel and other fuels such as light oil different from ammonia.

[0013] The ammonia tank 10 is a tank for storing liquid ammonia (in other words, liquefied ammonia). This ammonia tank 10 is installed on the upper deck 7 on the stern 3b side of the superstructure 4. Note that the arrangement of the ammonia tank 10 is an example and is not limited to the upper deck 7 on the stern 3b side of the superstructure 4.

[0014] The piping system 20 connects the combustion device 8 and the ammonia tank 10 and is configured to be able to supply at least the ammonia stored in the ammonia tank 10 to the combustion device 8.

[0015] The compartment 30 is a compartment for accommodating ammonia-related equipment. The compartment 30 in the present embodiment is provided on the upper deck 7 on the bow 3a side of the superstructure 4. The above-described piping system 20 connects the combustion device 8 and the ammonia tank 10 via this compartment 30. Here, the ammonia-related equipment means all equipment for handling ammonia, and examples thereof include ammonia fuel equipment for handling ammonia and ammonia cargo equipment for handling ammonia as cargo. In the following description, the compartment 30 in which ammonia fuel equipment is accommodated will be described, but it may be a compartment 30 in which ammonia cargo equipment is accommodated.

[0016] The compartment 30 of the present embodiment is a fuel supply device room and accommodates ammonia fuel equipment that constitutes a part of the piping system 20. Examples of the ammonia fuel equipment accommodated in the fuel supply device room include a pump for pumping 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 for accommodating ammonia fuel equipment is not limited to the ammonia fuel supply device room. The compartment 30 for accommodating ammonia fuel equipment may be, for example, an ammonia fuel pressure regulating valve room, an ammonia fuel intake room (in other words, a bunker station), or the like.

[0017] FIG. 2 is a diagram showing a schematic configuration of a piping system for performing fuel purge and an ammonia decontamination device in the first embodiment of the present disclosure. As shown in Fig. 2, the floating body 1 of the present embodiment includes an ammonia buffer tank 40 that temporarily stores ammonia supplied from the ammonia tank 10. The ammonia buffer tank 40 is installed in the middle of the piping system 20 between the ammonia tank 10 and the combustion device 8. Further, a purge gas supply device 50 is connected to the piping system 20.

[0018] The piping system 20 includes a supply pipe 21, a return pipe 22, on-off valves 23 and 24, and a purge discharge line 25 between the ammonia buffer tank 40 and the combustion device 8. The supply pipe 21 and the return pipe 22 each connect the ammonia buffer tank 40 and the combustion device 8. The supply pipe 21 supplies ammonia from the ammonia buffer tank 40 to the combustion device 8. The return pipe 22 returns the surplus ammonia that remains unused as fuel in the combustion device 8 to the ammonia buffer tank 40. Note that the supply pipe 21 is provided with an ammonia pressurizing pump that pressurizes and pumps ammonia toward the combustion device 8, and an ammonia heat exchanger (both not shown) that heats the ammonia pressurized by the ammonia pressurizing pump.

[0019] The on-off valve 23 is provided in the supply pipe 21. The on-off valve 24 is provided in the return pipe 22. These on-off valves 23 and 24 are always in an open state during the operation of the combustion device 8. On the other hand, the on-off valves 23 and 24 are in a closed state when the combustion device 8 is stopped or the like. By closing these on-off valves 23 and 24, the flow paths formed inside the supply pipe 21 and the return pipe 22 are blocked.

[0020] The purge gas supply device 50 performs so-called purging to replace ammonia in the flow path R through which ammonia as fuel for the combustion device 8 flows with an inert gas (purge gas) such as nitrogen. The purge gas supply device 50 includes a purge gas supply unit 51, a purge gas supply pipe 52, and a purge gas supply valve 53. As the inert gas, for example, an inert gas generated inside the floating body main body 2 by an inert gas generation device (not shown) or an inert gas preliminarily stored in an inert gas tank (not shown) provided in the floating body main body 2 can be used. Note that the inert gas may be any gas that does not chemically react when it comes into contact with ammonia.

[0021] The purge gas supply unit 51 supplies the inert gas to the purge gas supply pipe 52. The purge gas supply pipe 52 connects the purge gas supply unit 51 and the flow path R. More specifically, the purge gas supply pipe 52 connects the purge gas supply unit 51 and the purge target region 20p of the flow path R. The purge target region 20p in the present embodiment can be exemplified by the supply pipe 21 on the combustion device 8 side of the on-off valve 23, the return pipe 22 on the combustion device 8 side of the on-off valve 24, and the flow path R formed in the combustion device 8. The purge gas supply pipe 52 exemplified in the present embodiment is connected to the purge target region 20p of the supply pipe 21 among the purge target regions 20p.

[0022] The purge gas supply valve 53 is provided in the purge gas supply pipe 52. The purge gas supply valve 53 is normally in a closed state, blocking the supply of the inert gas from the purge gas supply unit 51 to the purge target region 20p. Here, the normal time is when the combustion device 8 is operating, etc., when ammonia can be supplied to the combustion device 8. At this normal time, the on-off valves 23 and 24 are in an open state, enabling ammonia to be supplied from the ammonia buffer tank 40 to the combustion device 8 through the supply pipe 21, and excess ammonia to be returned from the combustion device 8 to the ammonia buffer tank 40.

[0023] The purge gas supply valve 53 is switched from the closed state to the open state when the combustion device 8 is emergently stopped or stopped for a long time. In other words, it is operated from the closed state to the open state when purging ammonia remaining in the purge target area 20p. At this time, the supply of ammonia from the ammonia buffer tank 40 to the combustion device 8 is stopped. And the on-off valves 23 and 24 of the present embodiment are in the closed state. Next, when the purge gas supply valve 53 is switched from the closed state to the open state, the inert gas can be supplied from the purge gas supply unit 51 to the purge target area 20p. In addition, when returning the remaining liquid ammonia to the ammonia buffer tank 40 at the initial stage of purging, the on-off valves 23 and 24 may be appropriately opened.

[0024] The purge discharge line 25 is branched and connected to the return pipe 22. The purge discharge line 25 of the present embodiment branches from the return pipe 22 between the on-off valve 24 and the combustion device 8. The purge discharge line 25 guides the liquid ammonia purged by the purge gas supply device 50, the liquid ammonia purged by the purge gas supply device 50, the mixed fluid of gaseous ammonia and inert gas to the ammonia decontamination device 60.

[0025] The purge discharge line 25 includes a purge discharge line main body 26, an ammonia temporary storage unit 27, and an on-off valve 28. The purge discharge line main body 26 is a pipe connecting the return pipe 22 and the ammonia temporary storage unit 27. The ammonia temporary storage unit 27 separates or vaporizes the liquid and gas introduced by the purge discharge line main body 26. In other words, the ammonia temporary storage unit 27 vaporizes the liquid ammonia introduced by the purge discharge line main body 26 and the liquid ammonia contained in the mixed fluid introduced by the purge discharge line main body 26, and introduces the gas containing gaseous ammonia (hereinafter referred to as ammonia gas) to the ammonia decontamination device 60. The on-off valve 28 is normally in the closed state and is operated from the closed state to the open state when purging is performed by the purge gas supply device 50.

[0026] The ammonia removal device 60 includes an absorption tank 61, an ammonia introduction section 62, a solubility adjustment section 63, an atmosphere release line 70, and an exhaust gas dilution section 64.

[0027] The absorption tank 61 is provided in the floating body main body 2 and stores an absorption liquid W capable of absorbing ammonia. The absorption tank 61 in the present embodiment is a ballast tank provided in the floating body main body 2. Water (for example, seawater, fresh water) around the floating body main body 2 can be introduced into this absorption tank 61 by a pump (not shown) and stored as the absorption liquid W. That is, an absorption liquid W (liquid phase) and a gas phase exist in the absorption tank 61. The absorption tank 61 is a so-called normal pressure tank, and the pressure of the gas phase is usually atmospheric pressure. Further, since the absorption tank 61 of the present embodiment is a ballast tank, the water stored in the absorption tank 61 can be discharged into the water around the floating body main body 2 through a ballast water treatment device (not shown). Note that the absorption tank 61 is not limited to a ballast tank, and may be, for example, a seawater tank or a fresh water tank provided separately from the ballast tank.

[0028] The ammonia introduction section 62 introduces the ammonia in the floating body main body 2 into the absorption liquid W stored in the absorption tank 61. The ammonia introduction section 62 of the present embodiment includes an introduction line 65 which is a pipe for introducing ammonia into the absorption tank 61, and a diffuser pipe 66 connected to the introduction line 65 for discharging ammonia gas into the absorption liquid W as small bubbles. The introduction line 65 of the present embodiment is connected to the above-described ammonia temporary storage section 27, and introduces the gaseous ammonia that has been gas-liquid separated or vaporized in the ammonia temporary storage section 27 into the absorption liquid W as ammonia in the floating body main body 2. Further, the diffuser pipe 66 of the present embodiment extends along the bottom surface of the absorption tank 61 and is formed such that the bubbles discharged from the diffuser pipe 66 spread throughout the absorption liquid W. Here, the gas discharged from the diffuser pipe 66 is discharged into the absorption liquid W using the pressure of the inert gas of the purge gas supply device 50. Here, the ratio of the inert gas contained in the gas introduced into the absorption liquid W from the ammonia temporary storage section 27 increases as the purge progresses.

[0029] The solubility adjustment unit 63 is configured to be able to adjust the solubility of ammonia in the absorption liquid W. The solubility adjustment unit 63 in this first embodiment is configured to be able to adjust the solubility of ammonia in the absorption liquid W by adjusting the concentration of ammonia gas in the gas phase of the absorption tank 61. Here, the gas phase of the absorption tank 61 and the absorption liquid W (liquid phase) tend to reach a gas-liquid equilibrium state. That is, as the ammonia concentration in the absorption liquid W increases, the ammonia concentration in the gas phase also gradually increases. On the other hand, when the ammonia concentration in the gas phase decreases, ammonia in the liquid phase is dissipated due to the partial pressure difference and is sequentially supplied to the gas phase, so the solubility of the absorption liquid W decreases.

[0030] The solubility adjustment unit 63 of the first embodiment includes a first dilution gas supply line 67, a first blower 68, and a first valve 69. The first dilution gas supply line 67 is a pipe through which air or an inert gas can be introduced into the gas phase of the absorption tank 61. The first dilution gas supply line 67 in this embodiment is configured to be able to introduce air into the gas phase of the absorption tank 61. The upper end of the first dilution gas supply line 67 opens, for example, above the upper deck 7, and the lower end of the first dilution gas supply line 67 is connected to the upper wall of the absorption tank 61. When the first dilution gas supply line 67 introduces an inert gas, the inert gas of the purge gas supply device 50 may be supplied.

[0031] The first blower 68 is provided in the middle of the first dilution gas supply line 67 and sends the air or inert gas in the first dilution gas supply line 67 toward the absorption tank 61. For example, a variable-speed blower can be used as the first blower 68. The first valve 69 is provided in the middle of the first dilution gas supply line 67 and opens and closes the flow path of the first dilution gas supply line 67. In addition, a blower with constant-speed operation can also be used as the first blower 68. In this case, a valve with adjustable opening degree can be used as the first valve 69 so that the flow rate of the air supplied into the absorption tank 61 can be adjusted.

[0032] The solubility adjustment unit 63 configured as described above adjusts the ammonia concentration in the gas phase of the absorption tank 61 within a predetermined ammonia concentration range lower than the saturation state (for example, 0 to 10 vol%).

[0033] The atmosphere release line 70 enables the gas phase in the absorption tank 61 to be released to the atmosphere. The atmosphere release line 70 of the present embodiment also serves as the air vent pipe of the absorption tank 61 which is a ballast tank. The atmosphere release line 70 of the present embodiment has an open line main body 71 which is a pipe, and an atmosphere release valve 72 that opens and closes the flow path within the open line main body 71. The lower end of the open line main body 71 is connected to the upper wall of the absorption tank 61, and the upper end of the open line main body 71 opens above the upper deck 7. The atmosphere release valve 72 in this first embodiment is in an always-open state. Note that the atmosphere release valve 72 may be provided as necessary and may be omitted if possible.

[0034] The exhaust gas dilution unit 64 is configured to be able to dilute the gas in the gas phase of the absorption tank 61 released into the atmosphere via the atmosphere release line 70 with a dilution gas. The exhaust gas dilution unit 64 of the present embodiment includes a second dilution gas supply line 74, a second blower 75, and a second valve 76. This exhaust gas dilution unit 64 has the same configuration as the solubility adjustment unit 63 described above. The second dilution gas supply line 74 is a pipe through which air or an inert gas can be introduced into the atmosphere release line 70. The second dilution gas supply line 74 of the present embodiment is configured to be able to introduce air into the atmosphere release line 70. One end of the second dilution gas supply line 74 opens above the upper deck 7, for example, and the other end of the second dilution gas supply line 74 is joined and connected to the middle of the atmosphere release line 70. Note that when the second dilution gas supply line 74 introduces an inert gas, the inert gas from the purge gas supply device 50 may be supplied. Note that the exhaust gas dilution unit 64 may be provided as necessary and may be omitted when the ammonia concentration of the gas flowing through the atmosphere release line 70 has sufficiently decreased.

[0035] (Function and effect) The floating body 1 of the above-described first embodiment includes a floating body main body 2 that floats on water, an absorption tank 61 provided in the floating body main body 2 and storing an absorption liquid W capable of absorbing ammonia, an air release line 70 that can open the gas phase in the absorption tank 61 to the atmosphere, an ammonia introduction part 62 that introduces ammonia in the floating body main body 2 into the absorption liquid W stored in the absorption tank 61, and a solubility adjustment part 63 that can adjust the solubility of ammonia in the absorption liquid W. By doing so, the ammonia in the floating body main body 2 can be absorbed by the absorption liquid W stored in the absorption tank 61. And by adjusting the solubility of ammonia in the absorption liquid W, the rate at which ammonia is dissipated from the absorption liquid W in the absorption tank 61 into the gas phase can be adjusted. That is, using the absorption liquid W as a buffer for temporarily storing ammonia, ammonia can be gradually dissipated from the absorption liquid W in the absorption tank 61 into the gas phase, and a gas with a low ammonia concentration can be released into the atmosphere. Also, by utilizing the partial pressure difference between the liquid phase and the gas phase, the solubility of ammonia in the absorption liquid W can be made extremely low, that is, almost all of the ammonia absorbed by the absorption liquid W is dissipated into the gas phase, and the absorption liquid W can be substantially detoxified. Therefore, it is not necessary to remove the ammonia in the absorption liquid W using an acid such as dilute sulfuric acid. Also, a kindling fire for combustion detoxification of ammonia is not required. Thus, it is possible to detoxify the absorption liquid W that has absorbed ammonia while suppressing an increase in the burden on workers and fuel consumption.

[0036] The solubility adjustment part 63 of the above-described first embodiment adjusts the ammonia concentration in the gas phase in the absorption tank 61. By doing so, the rate at which ammonia absorbed in the absorption liquid W is released into the gas phase can be adjusted. For example, if the ammonia concentration in the gas phase is lowered, the gas-liquid partial pressure difference becomes larger, and the ammonia absorbed in the absorption liquid W is immediately released into the gas phase, reducing the solubility of ammonia in the absorption liquid W. Therefore, the release of ammonia from the absorption liquid W to the gas phase can be accelerated. Also, if the ammonia concentration in the gas phase is increased, the gas-liquid partial pressure difference becomes smaller, and the ammonia absorbed in the absorption liquid W remains in the absorption liquid W, increasing the solubility of ammonia. Therefore, the release of ammonia from the absorption liquid W to the gas phase can be delayed.

[0037] In the first embodiment described above, further, the ammonia introduction section 62 introduces the ammonia discharged by the purge discharge line 25 into the absorption liquid W. Even ammonia discharged by a purge that occurs irregularly in this way and needs to be completed in a short time can be absorbed by the absorption liquid W and then gradually released into the gas phase. Therefore, there is no need to detoxify the ammonia discharged by the purge discharge line 25 in a short time. Therefore, since ammonia can be detoxified without using a large treatment device, it is possible to suppress the enlargement of the ammonia detoxification device and the enlargement of the floating body 1.

[0038] In the first embodiment described above, further, a solubility adjustment section 63 and an exhaust gas dilution section 64 are provided. For example, after ammonia is absorbed by the absorption liquid W, by opening the first valve 69 and supplying air from the first blower 68, the ammonia concentration in the gas phase can be lowered. And in order to maintain a gas-liquid equilibrium state in the absorption tank 61, the ammonia absorbed in the absorption liquid W can be gradually released into the gas phase. And if the ammonia in the absorption liquid W is released into the gas phase so that the ammonia concentration of the absorption liquid W becomes an extremely low value, for example, the absorption liquid W can be substantially detoxified and discharged into the water around the floating body main body 2 where it floats. Also, immediately after starting to supply air to the gas phase by the first blower 68, a gas with a relatively high ammonia concentration is introduced into the atmosphere release line 70. However, since the second valve 76 of the exhaust gas dilution section 64 can be opened and air can be merged by the second blower 75, it is possible to suppress the release of a gas with a high ammonia concentration into the atmosphere. Further, when the ammonia concentration of the gas introduced into the atmosphere release line 70 is not high, the second blower 75 of the exhaust gas dilution section 64 can be stopped and the second valve 76 can be closed, so that energy saving can be achieved.

[0039] (First Modification of the First Embodiment) In the above first embodiment, the case of operating the solubility adjustment unit 63, the exhaust gas dilution unit 64, and the atmosphere release valve 72 has been described. However, the ammonia concentration in the release line main body 71 of the atmosphere release line 70, the ammonia concentration in the gas phase of the absorption tank 61, and the ammonia concentration of the absorption liquid W are detected by sensors, and based on the detection results of these ammonia concentrations, for example, the opening and closing of the first valve 69, the second valve, and the atmosphere release valve 72, and the adjustment of the supply amount of air or inert gas by the first blower 68 or the second blower may be automatically performed by a control device.

[0040] (Second Modification of the First Embodiment) In the above first embodiment, the case where the solubility adjustment unit 63 adjusts the ammonia concentration in the gas phase by pushing air into the gas phase of the absorption tank 61 by the first blower 68 has been described. However, the configuration for adjusting the ammonia concentration in the gas phase is not limited to the configuration of the first embodiment. In the description of this second modification, the same reference numerals are given to the same parts as those in the above-described first embodiment, and redundant description is omitted. FIG. 3 is a diagram corresponding to FIG. 2 in the second modification of the first embodiment of the present disclosure.

[0041] As shown in FIG. 3, the floating body 1 of this second modification includes a solubility adjustment unit 163 instead of the exhaust gas dilution unit 64 and the solubility adjustment unit 63 of the first embodiment. This solubility adjustment unit 163 includes a first dilution gas supply line 167, a first valve 69, and a third blower 81. The first dilution gas supply line 167 in this second modification is different from the first dilution gas supply line 67 of the first embodiment only in that the first blower 68 is not provided. Similarly, the second dilution gas supply line 174 is different from the second dilution gas supply line 74 of the first embodiment only in that the second blower 75 is not provided.

[0042] The atmosphere release line 170 includes an open line main body 71, an atmosphere release valve 72, and a third blower 81. That is, the atmosphere release line 170 in this second modification is different from the atmosphere release line 170 of the first embodiment in that it includes a third blower 81. The third blower 81 is provided in the middle of the open line main body 71 of the atmosphere release line 170 and can suck the gas in the gas phase and send it out into the atmosphere. The second dilution gas supply line 174 is joined and connected to the open line main body 71 between the third blower 81 and the absorption tank 61. The second dilution gas supply line 174 can join air or an inert gas to the gas flowing in the atmosphere release line 70. The second valve 76 opens and closes the flow path in the second dilution gas supply line 174.

[0043] In the second modification of the first embodiment, as in the first embodiment, ammonia is introduced into the absorption liquid W by the ammonia introduction unit 62, and the absorption liquid W is in a state where ammonia is absorbed. The ammonia absorbed by the absorption liquid W gradually diffuses into the gas phase due to the gas-liquid partial pressure difference. When the third blower 81 is operated here, the gas in the gas phase is sucked by the atmosphere release line 70. At this time, the first valve 69 of the first dilution gas supply line 167 is in an open state, and air or an inert gas is drawn into and introduced into the gas phase of the absorption tank 61. Thereby, the ammonia concentration in the gas phase can be reduced. On the other hand, when the third blower 81 is stopped, the increase in the ammonia concentration in the gas phase continues.

[0044] Also, when the ammonia concentration of the gas in the gas phase flowing into the flow path of the atmosphere release line 170 is high, by opening the second valve 76, air or an inert gas can be merged into the gas in the gas phase flowing into the atmosphere release line 70. Therefore, it is possible to suppress the release of a gas with a high ammonia concentration into the atmosphere. Therefore, while reducing the number of blowers compared to the first embodiment, it is possible to adjust the solubility of the absorption liquid W in the same manner as in the first embodiment.

[0045] (Third modification example of the first embodiment) In the above first embodiment, the case where the absorption tank 61 is a ballast tank that is an atmospheric pressure tank has been described as an example. However, the absorption tank 61 is not limited to an atmospheric pressure tank. In the description of this third modification example as well, the same parts as those in the above-described first embodiment are denoted by the same reference numerals, and redundant descriptions are omitted. FIG. 4 is a diagram corresponding to FIG. 2 in the third modification example of the first embodiment of the present disclosure.

[0046] As shown in FIG. 4, in the floating body 1 of this third modification example, the absorption tank 61 of the first embodiment is replaced with a pressurized type absorption tank 161. Further, in the third modification example, the first blower 68 of the first embodiment is replaced with a first compressor 168.

[0047] According to the floating body 1 of the third modification example of the first embodiment, ammonia is absorbed into the absorption liquid W by the ammonia introduction section 62 with the first valve 69 and the atmosphere release valve 72 in a closed state. The ammonia absorbed by the absorption liquid W is gradually dissipated into the gas phase as it tries to reach the gas-liquid equilibrium state. On the other hand, when the first valve 69 is opened from this state and air or an inert gas is pumped into the absorption tank 161 by the first compressor 168, the pressure of the gas phase in the absorption tank 161 increases. As a result, the pressure in the absorption tank 161 increases, and the solubility of ammonia in the absorption liquid W can be increased. In the third modification example, the solubility adjustment section 163 is constituted by the first dilution gas supply line 67, the first compressor 168, and the first valve 69.

[0048] Further, according to the third modification example, by increasing the solubility of ammonia in the absorption liquid W, it becomes possible to absorb more ammonia into the absorption liquid W. Furthermore, for example, by adjusting the opening degree of the atmosphere release valve 72 and the opening degree of the first valve 69, etc., the flow rate of the exhaust gas discharged from the absorption tank 161 is made smaller than the flow rate of the dilution gas introduced into the absorption tank 161, so that the gas in the gas phase is discharged into the atmosphere through the atmosphere release line 70 while maintaining the pressure in the absorption tank 161 higher than the atmospheric pressure.

[0049] In addition, also in this third modification example, similar to the first embodiment described above, the gas flowing into the atmosphere release line 70 can be diluted by the exhaust gas dilution unit 64. In the description of the above third modification example, the case where the pressure in the absorption tank 161 is adjusted by the first dilution gas supply line 67, the first compressor 168, and the first valve 69 has been described, but it is not limited to this configuration. For example, when the gas introduced into the absorption liquid W by the ammonia introduction unit 62 is a mixed gas of ammonia gas and an inert gas such as nitrogen, the inert gas introduced into the absorption liquid W accumulates in the gas phase without being absorbed by the absorption liquid W. And the pressure of the gas phase can be increased. Therefore, when the pressure of the gas phase can be increased in this way, the first dilution gas supply line 67, the first compressor 168, and the first valve 69 can also be omitted. In this case, the solubility adjustment unit of the present disclosure is constituted by the ammonia introduction unit 62 and the atmosphere release valve 72.

[0050] (Fourth to Sixth Modification Examples of the First Embodiment) FIG. 5 is a diagram corresponding to FIG. 2 in the fourth modification example of the first embodiment of the present disclosure. FIG. 6 is a diagram corresponding to FIG. 2 in the fifth modification example of the first embodiment of the present disclosure. FIG. 7 is a diagram corresponding to FIG. 2 in the sixth modification example of the first embodiment of the present disclosure. In the solubility adjustment unit 63 of the first embodiment described above, the case where the solubility of ammonia in the absorption liquid W is adjusted by adjusting the ammonia concentration in the gas phase was explained. Also, in the solubility adjustment unit 163 of the third modification of the first embodiment, the case where the solubility of ammonia in the absorption liquid W is adjusted by adjusting the pressure of the gas phase was explained. However, the configurations of the solubility adjustment units 63 and 163 are not limited to the configurations of the first embodiment and the third modification of the first embodiment. For example, as in the fourth modification shown in FIG. 5, the solubility adjustment unit 263 may include an absorption liquid temperature adjustment unit 82 that adjusts the temperature of the absorption liquid W. This absorption liquid temperature adjustment unit 82 is capable of performing at least one of heating the absorption liquid W and cooling the absorption liquid W. When the temperature of the absorption liquid W is high, the rate of ammonia dissipation from the absorption liquid W into the gas phase can be increased, and when the temperature of the absorption liquid W is low, the rate of ammonia dissipation from the absorption liquid W into the gas phase can be decreased.

[0051] Also, as in the fifth modification shown in FIG. 6, an absorption liquid pH adjustment device 83 that adjusts the pH of the absorption liquid W may be provided as the solubility adjustment unit 363, or as in the sixth modification shown in FIG. 7, an acidic fluid introduction device 84 that introduces a weakly acidic liquid or gas into the gas phase may be provided. By adjusting the pH of the absorption liquid W or the gas phase, the solubility of ammonia in the absorption liquid W may be adjusted. Furthermore, a configuration for adjusting the ammonia concentration in the gas phase, a configuration for adjusting the temperature of the absorption liquid W, a configuration for adjusting the pH of the absorption liquid W, a configuration for adjusting the pH of the gas phase, and a configuration for adjusting the pressure of the gas phase may be appropriately combined to adjust the solubility of ammonia.

[0052] (Second Embodiment) Next, the floating body 1 in the second embodiment of the present disclosure will be described with reference to the drawings. This second embodiment is different from the first embodiment described above only in that ammonia leaked within the compartment 30 in which the ammonia-related equipment is housed is introduced into the absorption liquid W. Therefore, in this second embodiment, FIG. 1 is incorporated, and the same parts as those in the first embodiment described above are denoted by the same reference numerals and described, and redundant descriptions are omitted.

[0053] Figure 8 corresponds to Figure 2 in the second embodiment of the present disclosure. The floating body 1 of the second 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 detoxification device 260.

[0054] As shown in Figure 8, the ammonia detoxification device 260 includes an absorption tank 61, an ammonia introduction section 262, a solubility adjustment section 63, and an exhaust gas dilution section 64.

[0055] Similar to the ammonia introduction section 62 of the first embodiment, the ammonia introduction section 262 introduces ammonia in the floating body main body 2 into the absorption liquid W stored in the absorption tank 61. And the ammonia introduction section 262 of the present embodiment includes an introduction line 265 which is a pipe for introducing ammonia into the absorption tank 61, and a diffuser pipe 66 connected to the introduction line 265 for discharging ammonia gas as small bubbles into the absorption liquid W. Similar to the diffuser pipe 66 of the first embodiment, the diffuser pipe 66 extends along the bottom surface of the absorption tank 61 and is formed such that the bubbles discharged from the diffuser pipe 66 spread throughout the absorption liquid W.

[0056] The introduction line 265 of this second embodiment is connected to the compartment 30. The introduction line 265 introduces gaseous ammonia that has leaked and vaporized in the compartment 30 into the absorption liquid W as ammonia in the floating body main body 2. The compartment 30 is provided with an air supply facility 91 and an exhaust facility 92 for ventilation. The intake facility 91 includes an air supply damper 94 and an air supply duct 95, and the exhaust facility 92 includes an exhaust fan 93, an exhaust damper 96, and an exhaust duct 97.

[0057] The introduction line 265 includes a line body 86, an introduction blower 87, an introduction blower inlet damper 88, and an introduction damper 89. The line body 86 is a pipe having a flow path inside. The introduction blower 87 is provided in the middle of the line body 86 and sends the gas in the line body 86 toward the absorption tank 61. For example, a variable-speed blower can be used as the introduction blower 87.

[0058] The inlet damper 88 of the introduction blower is provided on the inlet side of the line body 86 closer to the compartment 30 than the introduction blower 87 in the line body 86, and opens and closes the flow path of the line body 86. The inlet damper 88 of the introduction blower is in a closed state during normal times when there is no ammonia leakage in the compartment 30, and is in an open state when ammonia leakage occurs in the compartment 30. Note that the inlet damper 88 of the introduction blower may be provided as appropriate and may be omitted.

[0059] The introduction damper 89 is provided on the line body 86 between the introduction blower 87 and the absorption tank 61 in the line body 86, and opens and closes the flow path of the line body 86. The introduction damper 89 is in a closed state during normal times when there is no ammonia leakage in the compartment 30, and is in an open state when ammonia leakage occurs in the compartment 30. Note that as the introduction blower 87, a blower that operates at a constant speed can also be used. In this case, dampers with adjustable opening degrees may be used as the inlet damper 88 of the introduction blower and the introduction damper 89 so that the flow rate of the air supplied into the absorption tank 61 can be adjusted.

[0060] In this second embodiment, when ammonia leakage occurs in the compartment 30, for example, the exhaust fan 93 is stopped and the exhaust damper 96 is closed by an operator, and at the same time, the air supply damper 94, the inlet damper 88 of the introduction blower, and the introduction damper 89 are opened. Further, for example, the introduction blower 87 is started by an operator. And at this time, the rotation speed of the introduction blower 87 and the opening degree of the air supply damper 94 are adjusted so that the pressure in the compartment 30 is maintained lower than the atmospheric pressure. By making the pressure in the compartment 30 lower than the atmospheric pressure in this way, ammonia leakage to the outside of the compartment 30 is suppressed.

[0061] (Function and Effect) The ammonia introduction section 262 of the second embodiment introduces the ammonia leaked in the compartment 30 into the absorbent liquid W in the absorption tank 61. Therefore, the ammonia leaked in the compartment 30 can be removed, and, similar to the first embodiment, the absorbent liquid W that has absorbed ammonia can be detoxified. As a result, while suppressing an increase in the burden on the operator and fuel consumption, the absorbent liquid W that has absorbed ammonia can be detoxified.

[0062] (Modification example of the second embodiment) FIG. 9 is a diagram corresponding to FIG. 8 in a modification example of the second embodiment of the present disclosure. In the above-described second embodiment, the case where the exhaust facility 92 is connected to the compartment 30 has been described. However, for example, the exhaust facility 92 of the second embodiment can be omitted and configured as in the modification example of the second embodiment shown in FIG. 9. In this modification example of the second embodiment, an exhaust facility 192 is connected to the line body 86 between the introduction blower 87 and the introduction damper 89 in the line body 86 of the ammonia introduction section 262. This exhaust facility 192 is an exhaust facility for the compartment 30 and includes an exhaust damper 196 and an exhaust line 197.

[0063] The exhaust damper 196 is provided in the middle of the exhaust line 197 and opens and closes the flow path in the exhaust line 197. This exhaust damper 196 is in an open state during normal times when there is no ammonia leakage in the compartment 30, and is in a closed state when ammonia leakage occurs in the compartment 30. The exhaust line 197 branches from the line body 86 between the introduction blower 87 and the introduction damper 89 in the line body 86, and forms a flow path for discharging the air in the compartment 30 to the outside of the floating body main body 2 during normal times when there is no ammonia leakage in the compartment 30.

[0064] In a modification of this second embodiment, the introduction blower 87 is always in an operating state. Then, during normal times when there is no ammonia leakage in the compartment 30, the exhaust damper 196, the introduction blower inlet damper 88, and the air supply damper 94 are opened by an operator, and the introduction damper 89 is closed. As a result, outside air is taken into the compartment 30 from the air supply facility 91, and the air in the compartment 30 is discharged to the outside of the floating body 2 through the line main body 86 and the exhaust line 197. In other words, the compartment 30 is ventilated.

[0065] On the other hand, when ammonia leakage occurs in the compartment 30, for example, the exhaust damper 196 is closed by an operator, and the air supply damper 94, the introduction blower inlet damper 88, and the introduction damper 89 are opened. And at this time, similar to the second embodiment, the pressure inside the compartment 30 is maintained lower than the atmospheric pressure. Note that, similar to the second embodiment, the introduction blower inlet damper 88 may be omitted in this modification of the second embodiment.

[0066] Therefore, according to the modification of the second embodiment, in addition to the effects of the second embodiment, the introduction blower 87 can be used not only as a blower for removing ammonia leaked in the compartment 30 but also as an exhaust fan for ventilating the compartment 30 during normal times, so that the number of parts can be reduced.

[0067] 〈Other Embodiments〉 As described above, the embodiments of the present disclosure have been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and design changes and the like within the scope not departing from the gist of the present disclosure are also included. For example, in each of the above embodiments, the case where the floating body 1 is a ship that can navigate by a main machine or the like has been described. However, it is not limited to a ship as long as it is a floating body capable of storing ammonia.

[0068] In addition, the case where the atmosphere release lines 70 and 170 are open to the atmosphere in each embodiment and each modification has been described. However, before releasing the gas into the atmosphere from the atmosphere release lines 70 and 170, ammonia contained in the gas flowing through the atmosphere release line 70 may be removed by an ammonia removal device such as a scrubber. By doing so, it becomes possible to further reduce the ammonia concentration of the gas released into the atmosphere. Here, since the amount of ammonia contained in the gas flowing through the atmosphere release line 70 is small, a small-capacity ammonia removal device such as a small scrubber may be used, and a decrease in the degree of freedom of installation of the ammonia removal device in the floating body main body 2 can be suppressed.

[0069] In the second embodiment, the case where an operator manually performs the opening and closing operations of the exhaust fan 93, the exhaust damper 96, the air supply damper 94, the introduction blower inlet damper 88, and the introduction damper 89, and the operation and stop operations of the introduction blower 87 has been described. In addition, in a modification of the second embodiment, the case where an operator manually performs the opening and closing operations of the exhaust damper 196, the air supply damper 94, the introduction blower inlet damper 88, and the introduction damper 89 has been described. However, the configuration is not limited to being manually operated by an operator. For example, based on the detection result of ammonia leakage such as the ammonia concentration in the compartment 30, the opening and closing operations of the exhaust fan 93, the exhaust dampers 96 and 196, the air supply damper 94, the introduction blower inlet damper 88, and the introduction damper 89, and the operation and stop operations of the introduction blower 87 may be automatically controlled by a control device.

[0070] <Appendix> The floating body 1 described in the embodiment is understood as follows, for example.

[0071] (1) According to the first aspect, the floating body 1 includes a floating body main body 2 that floats on water, absorption tanks 61, 161 provided on the floating body main body 2 and storing an absorption liquid W capable of absorbing ammonia, an atmosphere release line 70 that can open the gas phase in the absorption tanks 61, 161 to the atmosphere, ammonia introduction parts 62, 262 that introduce ammonia in the floating body main body 2 into the absorption liquid W stored in the absorption tanks 61, 161, and solubility adjustment parts 63, 163, 263, 363 that can adjust the solubility of ammonia in the absorption liquid W. Examples of the absorption liquid W include seawater and fresh water. An example of the absorption tank 61 is a ballast tank.

[0072] Thereby, ammonia in the floating body main body 2 can be absorbed by the absorption liquid W stored in the absorption tanks 61, 161. And by adjusting the solubility of ammonia in the absorption liquid W by the solubility adjustment parts 63, 163, 263, 363, the rate at which ammonia is diffused from the liquid phase to the gas phase in the absorption tanks 61, 161 can be adjusted. Thereby, using the absorption liquid W as a buffer for temporarily storing ammonia, ammonia can be gradually diffused from the absorption liquid W in the absorption tanks 61, 161 to the gas phase, and a gas with a low ammonia concentration can be released into the atmosphere. Also, by utilizing the partial pressure difference between the liquid phase and the gas phase, the solubility of ammonia in the absorption liquid W can be made extremely low, that is, almost all of the ammonia absorbed by the absorption liquid W can be diffused into the gas phase to substantially detoxify the absorption liquid W, so there is no need to remove ammonia in the absorption liquid W using an acid such as dilute sulfuric acid. Also, a kindling fire for burning and excluding ammonia is not required. Therefore, it is possible to detoxify the absorption liquid W that has absorbed ammonia while suppressing an increase in the burden on workers and fuel consumption.

[0073] (2) The floating body 1 according to the second aspect is the floating body 1 of (1), wherein the solubility adjustment parts 63, 163, 263, 363 adjust the solubility of ammonia by adjusting at least one of the concentration of ammonia in the gas phase, the temperature of the absorption liquid W, the pH of the absorption liquid W, the pH of the gas phase, and the pressure of the gas phase. This makes it possible to easily adjust the solubility of ammonia in the absorbing liquid W.

[0074] (3) The float 1 according to the third aspect is the float 1 of (1) or (2), and includes a combustion device 8 that uses ammonia as fuel, a fuel tank 10 that stores the ammonia as fuel, a fuel line 20 that supplies the ammonia from the fuel tank 10 to the combustion device 8, a purge gas supply device 50 that supplies purge gas into the fuel line 20, and a purge discharge line that discharges the ammonia in the fuel line pressed by the purge gas, and the ammonia introduction section introduces the ammonia discharged by the purge discharge line into the absorption liquid W. This allows the ammonia discharged from the purge discharge line to be absorbed in the absorption tanks 61, 161 in a short time, while the ammonia absorbed in the absorption liquid W can be gradually released into the gas phase. Therefore, it is no longer necessary to quickly detoxify the ammonia purged from the combustion device 8, the fuel tank 10, the fuel line 20, etc.

[0075] (4) The float 1 according to the fourth aspect is the float 1 of (1) or (2), and is provided with a compartment 30 in which ammonia-related equipment is housed and into which outside air can be introduced, and the ammonia introduction part 262 introduces the gas in the compartment 30 into the absorption liquid W. As a result, the ammonia leaked within the compartment 30 of the floating body main body 2 can be absorbed into the absorbing liquid W, and the ammonia leaked within the compartment 30 can be removed by being absorbed into the absorbing liquid W in the absorption tank 61. In addition, the ammonia absorbed in the absorbing liquid W can be gradually released into the gas phase to detoxify the absorbing liquid W.

[0076] (5) The float 1 according to the fifth aspect is any one of the floats 1 of (1) to (4), and is provided with an atmospheric release valve 72 capable of closing the atmospheric release line 70, and the absorption tank 161 is a pressure tank that can be sealed at a pressure higher than atmospheric pressure. Thereby, the pressure inside the absorption tank 161 can be increased. Therefore, the pressure of the gas phase can be increased to adjust the solubility of ammonia in the absorption liquid W.

[0077] (6) The floating body 1 according to the sixth aspect is any one of the floating bodies 1 in (1) to (5), and includes an exhaust gas dilution unit 64 that can dilute the gas of the gas phase discharged into the atmosphere through the atmosphere release line 70 with a dilution gas. Thereby, it is possible to suppress the release of a gas with a high ammonia concentration from the atmosphere release line 70 into the atmosphere.

Explanation of Signs

[0078] 1... Floating body 2... Floating body main body 4... Upper structure 5A, 5B... Side hull 6... Bottom hull 7... Upper deck 8... Combustion device 10... Ammonia tank 20... Pipe system 21... Supply pipe 22... Return pipe 23, 24... On-off valve 25... Purge discharge line 26... Purge discharge line main body 27... Ammonia temporary storage part 28... On-off valve 30... Compartment 40... Ammonia buffer tank 50... Purge gas supply device 51... Purge gas supply part 52... Purge gas supply pipe 53... Purge gas supply valve 60, 260... Ammonia decontamination device 61, 161... Absorption tank 62, 262... Ammonia introduction part 63, 163, 263, 363... Solubility adjustment part 64... Exhaust gas dilution part 65... Introduction line 66... Diffuser pipe 67, 167... First dilution gas supply line 68... First blower 69... First valve 70, 170... Atmosphere release line 71... Release line main body 72... Atmosphere release valve 74, 174... Second dilution gas supply line 75... Second blower 76... Second valve 81... Third blower 82... Absorption liquid temperature adjustment part 83... Absorption liquid pH adjustment device 84... Acidic fluid introduction device 86... Line main body 87... Introduction blower 88... Introduction blower inlet damper 89... Introduction damper 91... Air supply facility 92... Exhaust facility 93... Exhaust fan 94... Air supply damper 95... Air supply duct 96... Exhaust damper 97... Exhaust duct 168... First compressor 192... Exhaust facility 196... Exhaust damper 197... Exhaust line R... Flow path

Claims

1. A floating body main body floating on water, an absorption tank provided on the floating body main body and storing an absorption liquid capable of absorbing ammonia, an air release line capable of opening the gas phase in the absorption tank to the atmosphere, an ammonia introduction part for introducing ammonia in the floating body main body into the absorption liquid stored in the absorption tank, a solubility adjustment part capable of adjusting the solubility of ammonia in the absorption liquid, a combustion device using ammonia as fuel, a fuel tank storing ammonia as fuel, a fuel line for supplying ammonia from the fuel tank to the combustion device, a purge gas supply device for supplying purge gas into the fuel line, a purge discharge line for discharging ammonia in the fuel line pressed by the purge gas, comprising: The ammonia introduction part introduces the ammonia discharged by the purge discharge line into the absorption liquid floating body.

2. A floating body main body floating on water, an absorption tank provided on the floating body main body and storing an absorption liquid capable of absorbing ammonia, an air release line capable of opening the gas phase in the absorption tank to the atmosphere, an ammonia introduction part for introducing ammonia in the floating body main body into the absorption liquid stored in the absorption tank, a solubility adjustment part capable of adjusting the solubility of ammonia in the absorption liquid, comprising: The floating body main body includes a compartment in which ammonia-related equipment is accommodated and into which outside air can be introduced, The ammonia introduction part introduces the gas in the compartment into the absorption liquid floating body.

3. The solubility adjustment part adjusts the solubility of ammonia by adjusting at least one of the concentration of ammonia in the gas phase, the temperature of the absorption liquid, the pH of the absorption liquid, the pH of the gas phase, and the pressure of the gas phase The floating body according to Claim 1 or 2.

4. Comprising an air release valve capable of closing the air release line, The absorption tank is a pressure tank that can be sealed at a pressure higher than atmospheric pressure The floating body according to any one of Claims 1 to 3.

5. Comprising an exhaust gas dilution part capable of diluting the gas in the gas phase discharged into the atmosphere through the air release line with a dilution gas The floating body according to any one of Claims 1 to 4.

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