Floating body

Abstract

To provide a floating body that can detoxify the absorbent liquid that has absorbed ammonia, while suppressing increased burden on workers and fuel consumption. [Solution] The floating body according to the present disclosure comprises a floating body body that floats on water, an ammonia introduction section into which ammonia from the floating body body can be introduced, an absorbent liquid introduction section into which an absorbent liquid capable of absorbing the ammonia can be introduced, a reactor that generates an ammonia absorbent liquid by reacting the ammonia from the ammonia introduction section with the absorbent liquid from the absorbent liquid introduction section, a recovery tank into which the ammonia absorbent liquid generated in the reactor and discharged from the reactor can be introduced and which can store the ammonia absorbent liquid, and an atmospheric release line that can release the gas phase in the recovery tank to the atmosphere.

Description

Technical Field

[0001] This disclosure relates to floating bodies.

Background Art

[0002] In floating bodies such as ships, when transporting and supplying ammonia as fuel for power generation or using ammonia as fuel for main engines, etc., ammonia leakage may occur in compartments such as equipment rooms that house equipment for handling ammonia. If ammonia leakage occurs in such a compartment, it is assumed that the leaked ammonia will vaporize and leak out of the compartment. Patent Document 1 proposes a technique of providing a sealed duct communicating with the inside of the compartment, spraying water in this duct, absorbing ammonia in water in the duct, and making the inside of the compartment negative pressure to prevent ammonia from leaking out of the compartment. In this Patent Document 1, the water that has absorbed ammonia is returned to the water tank and circulated through the water spray nozzles again, or discharged to other treatment facilities.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, when trying to absorb and remove ammonia in water as in Patent Document 1, the required amount of water increases as the amount of ammonia discharged increases. However, since the space inside the floating body is limited, there may be cases where a storage place for a large amount of water that has absorbed ammonia cannot be secured. And since it may have an impact on 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] One method for removing ammonia from water that has absorbed it is to use an acid such as dilute sulfuric acid. However, acids such as dilute sulfuric acid can be difficult to obtain at ports of call or mooring locations, and their handling requires expertise, which increases the burden on workers. On the other hand, highly concentrated ammonia can be rendered harmless by burning it without absorbing it with water. However, since the ammonia removal process described above occurs irregularly and needs to be completed quickly, the combustion device requires a pilot light at all times, which presents the challenge of increased fuel consumption. This disclosure was made to solve the above-mentioned problems and aims to provide a floating body that can decontaminate the absorbent liquid that has absorbed ammonia while suppressing increased burden on workers and fuel consumption. [Means for solving the problem]

[0006] To address the above issues, the following configuration will be adopted. A floating body according to one aspect of the present disclosure comprises a floating body body that floats on water, an ammonia introduction section into which ammonia from within the floating body body can be introduced, an absorbent liquid introduction section into which an absorbent liquid capable of absorbing the ammonia can be introduced, a reactor that generates an ammonia absorbent liquid by reacting the ammonia from the ammonia introduction section with the absorbent liquid from the absorbent liquid introduction section, and a recovery tank into which the ammonia absorbent liquid generated in the reactor and discharged from the reactor is introduced and into which the ammonia absorbent liquid can be stored. [Effects of the Invention]

[0007] According to the floating body described above, it is possible to decontaminate the absorbent liquid that has absorbed ammonia while suppressing the burden on workers and the increase in fuel consumption. [Brief explanation of the drawing]

[0008] [Figure 1] This is a side view of a floating body according to the first embodiment of this disclosure. [Figure 2]This figure shows a schematic configuration of the fuel purging piping system and ammonia abatement device in the first embodiment of the present disclosure. [Figure 3] This figure corresponds to Figure 2 in the second modified example of the first embodiment of the present disclosure. [Figure 4] This figure corresponds to Figure 2 in the fourth modified example of the first embodiment of the present disclosure. [Figure 5] This figure corresponds to Figure 2 in the fifth modified example of the first embodiment of the present disclosure. [Figure 6] This figure corresponds to Figure 5 in the second embodiment of the present disclosure. [Figure 7] This figure corresponds to Figure 2 in the third embodiment of this disclosure. [Figure 8] This figure shows the piping system around the ammonia solution tank for denitrification in a denitrification apparatus according to the fourth embodiment of this disclosure. [Figure 9] This figure shows a schematic configuration of an ammonia removal device according to the fifth embodiment of this disclosure. [Figure 10] This diagram shows the arrangement of the dilution tank and the recovery tank of the ammonia abatement apparatus according to the first modified example of the fifth embodiment of this disclosure. [Modes for carrying out the invention]

[0009] [First Embodiment] Hereinafter, a floating body according to the first embodiment of this disclosure will be described with reference to the drawings. Figure 1 is a side view of the floating body according to the first embodiment of this disclosure. (Structure of the floating body) As shown in Figure 1, the floating body 1 of this embodiment comprises a floating body body 2, a superstructure 4, a combustion device 8, an ammonia tank 10, a piping system (fuel line) 20, a compartment 30, and an ammonia abatement device 60. The floating body 1 of this embodiment will be described as a vessel capable of navigation by a main engine, etc., as an example. The type of vessel for the floating body 1 is not limited to a specific type of vessel. Examples of vessel types for the floating body 1 include liquefied gas carriers, ferries, RORO ships, car carriers, passenger ships, etc.

[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 that respectively form the left and right side hulls. The bottom hull 6 includes a bottom shell plate that connects these side hulls 5A and 5B. With 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 a upper deck 7 which is an all-through deck arranged at the uppermost layer. The superstructure 4 is formed on this upper deck 7. Living quarters and the like are provided inside the superstructure 4. In the floating body 1 of the present 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 rather than the superstructure 4.

[0012] The combustion device 8 is a device that generates thermal energy by burning fuel, and is provided inside the above-mentioned floating body main body 2. Examples of the combustion device 8 include an internal combustion engine used for the main engine to propel the floating body 1, an internal combustion engine used for the power generation equipment to supply electricity to the ship, a boiler that generates steam as a working fluid, and the like. The combustion device 8 of the present embodiment can be switched to use ammonia as fuel and other fuels such as light oil different from ammonia.

[0013] The ammonia tank 10 is a tank that stores liquid ammonia (in other words, liquefied ammonia). This ammonia tank 10 is installed on the upper deck 7 on the stern 3b side rather than the superstructure 4. Note that the arrangement of the above-mentioned ammonia tank 10 is an example and is not limited to the upper deck 7 on the stern 3b side rather than the superstructure 4. The ammonia tank 10 of the present embodiment stores liquefied ammonia as fuel for the combustion device 8.

[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] Compartment 30 is a compartment for housing ammonia-related equipment. In this embodiment, compartment 30 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 above ammonia-related equipment means all equipment handling ammonia, and examples thereof include ammonia fuel equipment handling ammonia and ammonia cargo equipment handling ammonia as cargo. In the following description, compartment 30 housing ammonia fuel equipment will be described, but it may also be a compartment 30 housing ammonia cargo equipment.

[0016] Compartment 30 of this embodiment is a fuel supply device room and houses ammonia fuel equipment constituting a part of the piping system 20. Examples of the ammonia fuel equipment housed in the fuel supply device room include, for example, 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, etc. Note that the compartment 30 housing ammonia fuel equipment is not limited to the ammonia fuel supply device room. The compartment 30 housing ammonia fuel equipment may be, for example, an ammonia fuel pressure regulating valve room, an ammonia fuel intake room (in other words, a bunkering station), etc.

[0017] (Piping system for performing fuel purge) 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 this embodiment includes an ammonia buffer tank 40 for temporarily storing 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. Also, an inert 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 residual ammonia supply line 25 between the ammonia buffer tank 40 and the combustion device 8. The supply pipe 21 and the return pipe 22 connect the ammonia buffer tank 40 and the combustion device 8, respectively. The supply pipe 21 supplies ammonia from the ammonia buffer tank 40 to the combustion device 8. The return pipe 22 returns any excess ammonia that is not used as fuel in the combustion device 8 back to the ammonia buffer tank 40. The supply pipe 21 is also equipped with an ammonia pressurizing pump that pressurizes and pumps ammonia towards the combustion device 8, and an ammonia heat exchanger (neither of which are shown) that heats the ammonia pressurized by the ammonia pressurizing pump.

[0019] On-off valve 23 is provided in the supply pipe 21. On-off valve 24 is provided in the return pipe 22. These on-off valves 23 and 24 are kept open at all times when the combustion device 8 is in operation. On the other hand, the on-off valves 23 and 24 are closed when the combustion device 8 is stopped, etc. When these on-off valves 23 and 24 are closed, the flow paths formed inside the supply pipe 21 and the return pipe 22 are blocked.

[0020] The inert gas supply device 50 performs a so-called purge, replacing the 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 inert gas supply device 50 comprises an inert gas supply unit 51, an inert gas supply pipe 52, and an inert gas supply valve 53. As the inert gas, for example, an inert gas generated inside the floating body 2 by an inert gas generator (not shown) or an inert gas pre-stored in an inert gas tank (not shown) provided in the floating body 2 can be used. Note that the inert gas can be any gas that does not chemically react when in contact with ammonia.

[0021] The inert gas supply unit 51 supplies inert gas to the inert gas supply pipe 52. The inert gas supply pipe 52 connects the inert gas supply unit 51 to the flow path R. More specifically, the inert gas supply pipe 52 connects the inert gas supply unit 51 to the purging area 20p of the flow path R. The purging area 20p exemplified in this embodiment is 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 within the combustion device 8. The inert gas supply pipe 52 exemplified in this embodiment is connected to the purging area 20p of the supply pipe 21.

[0022] The inert gas supply valve 53 is located in the inert gas supply pipe 52. The inert gas supply valve 53 is normally closed, blocking the supply of inert gas from the inert gas supply unit 51 to the purging area 20p. Here, "normal operation" refers to times when ammonia can be supplied to the combustion device 8, such as when the combustion device 8 is running. In this normal operation, the on / off valves 23 and 24 are open, allowing ammonia to be supplied from the ammonia buffer tank 40 to the combustion device 8 through the supply pipe 21, and any excess ammonia is returned from the combustion device 8 to the ammonia buffer tank 40.

[0023] The inert gas supply valve 53 is opened from a closed state during emergency shutdowns or long-term shutdowns of the combustion device 8. In other words, it is operated from a closed state to an open state when purging ammonia remaining in the purging target area 20p. At this time, the supply of ammonia from the ammonia buffer tank 40 to the combustion device 8 is stopped. The on-off valves 23 and 24 in this embodiment are kept in a closed state. Next, when the inert gas supply valve 53 is opened from a closed state, inert gas can be supplied from the inert gas supply unit 51 to the purging target area 20p. Note that in the initial stages of purging, if the remaining liquid ammonia is to be returned to the ammonia buffer tank 40, the on-off valves 23 and 24 may be opened as appropriate.

[0024] The residual ammonia supply line 25 is branched and connected to the return pipe 22. In this embodiment, the residual ammonia supply line 25 branches off from the return pipe 22 between the on-off valve 24 and the combustion device 8. The residual ammonia supply line 25 leads liquid ammonia purged by the inert gas supply device 50, or a mixed fluid of liquid ammonia purged by the inert gas supply device 50, gaseous ammonia, and inert gas to the ammonia abatement device 60.

[0025] The residual ammonia supply line 25 comprises a residual ammonia supply line body 26, an ammonia temporary storage unit 27, and an on / off valve 28. The residual ammonia supply line body 26 is a pipe connecting the return pipe 22 and the ammonia temporary storage unit 27. The ammonia temporary storage unit 27 separates the liquid and gas introduced by the residual ammonia supply line body 26 or vaporizes the liquid. In other words, the ammonia temporary storage unit 27 vaporizes the liquid ammonia introduced by the residual ammonia supply line body 26 and the liquid ammonia contained in the mixed fluid introduced by the residual ammonia supply line body 26.

[0026] The on / off valve 28 is normally in a closed state, and is operated from the closed state to the open state when purging is performed by the inert gas supply device 50.

[0027] (Configuration of ammonia removal system) The ammonia abatement device 60 includes an ammonia introduction section 61, an absorbent liquid introduction section 62, a reactor 63, an ammonia absorbent liquid discharge line 64, a recovery tank 65, a gas phase ammonia concentration adjustment section 66, an atmospheric release line 70, an exhaust gas dilution section 73, and an ammonia absorbent liquid supply line 80.

[0028] The ammonia introduction unit 61 is configured to introduce ammonia from the floating body 2 into the reactor 63. In this embodiment, the ammonia introduction unit 61 introduces ammonia from the ammonia temporary storage unit 27 into the reactor 63. More specifically, it introduces a mixed fluid of ammonia gas and inert gas from the ammonia temporary storage unit 27 into the reactor 63. Here, the ammonia introduction unit 61 uses the pressure of the inert gas from the inert gas supply device 50 to introduce the mixed fluid into the reactor 63.

[0029] The absorbent liquid introduction section 62 is configured to allow the introduction of an absorbent liquid capable of absorbing ammonia into the reactor 63. In this embodiment, the absorbent liquid introduction section 62 introduces water as the absorbent liquid into the reactor 63. Here, seawater or fresh water can be used as examples of the absorbent liquid. Furthermore, as seawater, the seawater surrounding the floating body 2 can be used as an example, and as fresh water, the fresh water stored in the fresh water tank (not shown) of the floating body 2 can be used as an example. In this embodiment, the absorbent liquid introduction section 62 pumps up water (e.g., seawater, fresh water) surrounding the floating body 2 using a pump (not shown) and uses it as the absorbent liquid.

[0030] Reactor 63 generates ammonia absorbent W by reacting ammonia introduced through ammonia introduction section 61 with absorbent liquid introduced through absorbent liquid introduction section 62. Examples of reactor 63 include absorption towers and microreactors. This reactor 63 is capable of actively absorbing ammonia into the absorbent liquid. In other words, reactor 63 has the function of increasing the ammonia solubility of ammonia absorbent W. That is, reactor 63 can produce ammonia absorbent W in which ammonia is concentrated.

[0031] The reactor 63 illustrated in this embodiment is equipped with a plurality of reaction accelerating units 63t arranged vertically. The absorbent liquid is supplied to the uppermost reaction accelerating unit 63t, and the absorbent liquid that overflows from the uppermost reaction accelerating unit 63t moves to the reaction accelerating unit 63t immediately below it. Then, sequentially, the absorbent liquid overflows from the upper reaction accelerating units 63t and moves to the lower reaction accelerating units 63t, and each time the absorbent liquid overflows and flows down, it comes into contact with ammonia gas, and the ammonia gas is absorbed into the absorbent liquid. As a result, the ammonia solubility of the absorbent liquid increases in the lower reaction accelerating units 63t. The absorbent liquid that overflows from the lowermost reaction accelerating unit 63t is discharged from the bottom of the reactor 63 container as ammonia absorbent liquid W that has absorbed ammonia. The internal space of the reactor 63 in this first embodiment is at normal pressure (in other words, atmospheric pressure) or slightly negative pressure.

[0032] On the other hand, an inert gas discharge line 77 is provided at the top of the reactor 63 vessel for discharging the inert gas contained in the mixed fluid introduced into the reactor 63. In this embodiment, the inert gas discharge line 77 is connected to, for example, a vent post, and the inert gas discharged by the inert gas discharge line 77 is released into the atmosphere. For example, if there is a possibility that the concentration of ammonia gas mixed in with the inert gas discharged by the inert gas discharge line 77 will increase, the inert gas discharge line 77 may be connected to, for example, another small-scale abatement device such as a catalytic decomposition device to abate the ammonia before releasing it into the atmosphere. Note that, for example, if the reactor 63 is a microreactor, the above-described inert gas discharge line 77 can be omitted.

[0033] The ammonia absorbent discharge line 64 guides the ammonia absorbent W discharged from the reactor 63 to the recovery tank 65. In this embodiment, the case in which the ammonia absorbent discharge line 64 is connected to the ceiling wall 65a of the recovery tank 65 is illustrated, but the ammonia absorbent discharge line 64 is not limited to being connected to the ceiling wall 65a of the recovery tank 65, as long as it is configured to introduce and store the ammonia absorbent W in the recovery tank 65.

[0034] The recovery tank 65 receives the ammonia absorbent liquid W produced in the reactor 63 and discharged from the reactor 63. The recovery tank 65 is capable of storing this introduced ammonia absorbent liquid W. The recovery tank 65 is provided in the floating body 2. The recovery tank 65 illustrated in this embodiment uses a ballast tank provided in the floating body 2.

[0035] The recovery tank 65 contains both an ammonia absorbent W (liquid phase) and a gas phase. The recovery tank 65 in this embodiment is a so-called atmospheric pressure tank, and the pressure of the gas phase is normally atmospheric pressure. Furthermore, as described above, since the recovery tank 65 in this embodiment is a ballast tank, the liquid such as water stored in the recovery tank 65 can be released into the water surrounding the floating body 2 via a ballast water treatment device (not shown). Note that the recovery tank 65 is not limited to a ballast tank. The recovery tank 65 may be, for example, a seawater tank or a freshwater tank provided separately from the ballast tank. Also, the recovery tank 65 may be left empty when not in use.

[0036] The gas-phase ammonia concentration adjustment unit 66 adjusts the ammonia concentration in the gas phase of the recovery tank 65. In other words, the gas-phase ammonia concentration adjustment unit 66 can adjust the solubility of ammonia in the ammonia absorbent liquid W by adjusting the ammonia concentration in the gas phase. Here, the gas phase of the recovery tank 65 and the ammonia absorbent liquid W (liquid phase) tend to reach a gas-liquid equilibrium state. That is, as the ammonia solubility in the ammonia absorbent 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 from the liquid phase is released due to the partial pressure difference and sequentially supplied to the gas phase, thus decreasing the ammonia solubility in the ammonia absorbent liquid W.

[0037] The gas phase ammonia concentration adjustment unit 66 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 that can introduce air or an inert gas into the gas phase of the recovery tank 65. In this embodiment, the first dilution gas supply line 67 is capable of introducing air into the gas phase of the recovery tank 65. 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 ceiling wall 65a of the recovery tank 65. When the first dilution gas supply line 67 introduces an inert gas, it may be supplied with inert gas from an inert gas supply device 50 or supplied with inert gas discharged by an inert gas discharge line 77.

[0038] The first blower 68 is installed in the middle of the first dilution gas supply line 67 and supplies air or inert gas from the first dilution gas supply line 67 toward the recovery tank 65. For example, a variable-speed blower can be used for the first blower 68. The first valve 69 is installed 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 this case, a constant-speed blower can also be used for the first blower 68. In this case, a valve with adjustable opening degree should be used as the first valve 69 so that the flow rate of air supplied into the recovery tank 65 can be adjusted.

[0039] The gas-phase ammonia concentration adjustment unit 66 configured in this way adjusts the ammonia concentration in the gas phase of the recovery tank 65 to a predetermined range of ammonia concentrations lower than the saturation state (for example, 0 to 10 vol%).

[0040] The atmospheric release line 70 allows the gas phase in the recovery tank 65 to be released into the atmosphere. In this embodiment, the atmospheric release line 70 also serves as an air vent pipe for the recovery tank 65, which is a ballast tank. The atmospheric release line 70 in this embodiment has an open line body 71 which is a pipe, and an atmospheric release valve 72 which opens and closes the flow path within the open line body 71. The lower end of the open line body 71 is connected to the ceiling wall 65a of the recovery tank 65, and the upper end of the open line body 71 is open above the upper deck 7. In this first embodiment, the atmospheric release valve 72 is kept open at all times. The atmospheric release valve 72 may be provided as needed and may be omitted.

[0041] The exhaust gas dilution unit 73 is configured to dilute the gas phase of the recovery tank 65, which is released into the atmosphere via the atmospheric release line 70, with a dilution gas. The exhaust gas dilution unit 73 of this embodiment includes a second dilution gas supply line 74, a second blower 75, and a second valve 76. This exhaust gas dilution unit 73 has the same configuration as the gas phase ammonia concentration adjustment unit 66 described above. The second dilution gas supply line 74 is a pipe that can introduce air or an inert gas into the atmospheric release line 70. In this embodiment, the second dilution gas supply line 74 is configured to allow air to be introduced into the atmospheric release line 70. One end of the second dilution gas supply line 74 opens, for example, above the upper deck 7, and the other end of the second dilution gas supply line 74 is connected to the atmospheric release line 70 midway. When the second dilution gas supply line 74 introduces an inert gas, it may be supplied with inert gas from the inert gas supply device 50, or with inert gas discharged by the inert gas discharge line 77. The exhaust gas dilution section 73 may be provided as needed, and may be omitted if the ammonia concentration of the gas flowing through the atmospheric release line 70 has decreased sufficiently.

[0042] The ammonia absorbent liquid supply line 80 is capable of supplying the ammonia absorbent liquid W stored in the recovery tank 65 to the outside of the recovery tank 65. Examples of destinations for the ammonia absorbent liquid W supplied by the ammonia absorbent liquid supply line 80 include other ammonia abatement equipment, other storage tanks, and bunkering stations for unloading.

[0043] (Effects and Benefits) The floating body 1 of the first embodiment described above comprises a floating body body 2 that floats on water, an ammonia introduction section 61 into which ammonia from the floating body body 2 can be introduced, an absorbent liquid introduction section 62 into which an absorbent liquid capable of absorbing ammonia can be introduced, a reactor 63 that generates an ammonia absorbent liquid W by reacting ammonia from the ammonia introduction section 61 with an absorbent liquid from the absorbent liquid introduction section 62, a recovery tank 65 into which the ammonia absorbent liquid W generated in the reactor 63 and discharged from the reactor 63 is introduced and into which the ammonia absorbent liquid W can be stored, and an atmospheric release line 70 that allows the gas phase in the recovery tank 65 to be released to the atmosphere.

[0044] In this way, the reactor 63 can absorb the ammonia in the floating body 2 into the absorbent liquid. The ammonia absorbent liquid W, which has absorbed the ammonia, is then stored in the recovery tank 65, and the ammonia is gradually released from the ammonia absorbent liquid W in the recovery tank 65 into the gas phase, making it possible to release the gas with a low ammonia concentration into the atmosphere through the atmospheric release line 70. Furthermore, since the reactor 63 can increase the ammonia solubility of the ammonia absorbent liquid W without being affected by, for example, the partial pressure difference between the gas and liquid in the recovery tank 65, it is possible to suppress the need to enlarge the recovery tank 65 that stores the ammonia absorbent liquid W.

[0045] Furthermore, in the recovery tank 65, by utilizing the partial pressure difference between the liquid phase and the gas phase, almost all of the ammonia absorbed in the ammonia absorbent W is released into the gas phase, effectively detoxifying the ammonia absorbent W. This eliminates the need to remove ammonia from the ammonia absorbent W using acids such as dilute sulfuric acid. Furthermore, a pilot light is not required to burn and detoxify the ammonia. Therefore, it is possible to detoxify the ammonia absorbent liquid W while suppressing the burden on workers and the increase in fuel consumption.

[0046] The floating body 1 of the first embodiment described above is equipped with a gas phase ammonia concentration adjustment unit 66 for adjusting the ammonia concentration in the gas phase of the recovery tank 65. This allows for adjustment of the rate at which ammonia absorbed in the ammonia absorbent W is released into the gas phase. For example, lowering the ammonia concentration in the gas phase increases the partial pressure difference between the gas and liquid phases, causing the ammonia absorbed in the ammonia absorbent W to be quickly released into the gas phase, thus reducing the solubility of ammonia in the ammonia absorbent W. Therefore, the release of ammonia from the ammonia absorbent W to the gas phase can be accelerated. Conversely, increasing the ammonia concentration in the gas phase reduces the partial pressure difference between the gas and liquid phases, causing the ammonia absorbed in the ammonia absorbent W to remain in the ammonia absorbent W. Therefore, the release of ammonia from the ammonia absorbent W to the gas phase can be slowed down.

[0047] In the first embodiment described above, an exhaust gas dilution unit 73 is further provided. For example, immediately after the gas phase ammonia concentration adjustment unit 66 starts supplying air or inert gas to the gas phase, a gas with a relatively high ammonia concentration may be introduced into the atmospheric release line 70. However, since the second valve 76 of the exhaust gas dilution unit 73 can be opened and air can be added by the second blower 75, the release of gas with a high ammonia concentration into the atmosphere can be suppressed. Furthermore, if the ammonia concentration of the gas introduced into the atmospheric release line 70 is not high, the second blower 75 of the exhaust gas dilution unit 73 can be stopped and the second valve 76 can be closed, thereby saving energy.

[0048] In the first embodiment described above, the ammonia introduction unit 61 further introduces the ammonia discharged by the residual ammonia supply line 25 into the reactor 63. Even ammonia discharged through purging, which occurs irregularly and needs to be completed quickly, can be absorbed into the absorbent solution, stored in the recovery tank 65 as ammonia absorbent solution W, and then gradually released into the gas phase. Therefore, there is no need to quickly detoxify the ammonia discharged through the residual ammonia supply line 25. Consequently, ammonia can be detoxified without using a large-scale treatment device, thus suppressing the need to increase the size of the ammonia detoxification device 60 and the floating body 1.

[0049] In the first embodiment described above, an ammonia absorbent liquid supply line 80 is provided. Therefore, the ammonia absorbent liquid W stored in the recovery tank 65 can be supplied to the outside of the recovery tank 65. For example, when the floating body 1 is docked, the ammonia absorbent liquid W can be unloaded and quickly treated for pollution. In addition, by supplying the ammonia absorbent liquid W to equipment that uses ammonia within the floating body 1 via the ammonia absorbent liquid supply line 80, the ammonia absorbent liquid W can be effectively utilized.

[0050] (First modification of the first embodiment) In the first embodiment described above, the case in which an operator operates the gas phase ammonia concentration adjustment unit 66, the exhaust gas dilution unit 73, and the atmospheric release valve 72 was explained. However, the ammonia concentration in the open line body 71 of the atmospheric release line 70, the ammonia concentration in the gas phase of the recovery tank 65, and the ammonia solubility (in other words, ammonia concentration) of the ammonia absorption liquid W may be detected by sensors, and based on these ammonia solubility detection results, the control device may automatically perform actions such as opening and closing the first valve 69, the second valve, and the atmospheric release valve 72, or adjusting the amount of air or inert gas supplied by the first blower 68 and the second blower.

[0051] (Second modification of the first embodiment) In the first embodiment described above, the case in which the gas phase ammonia concentration adjustment unit 66 adjusts the ammonia concentration in the gas phase by forcing air into the gas phase of the recovery tank 65 with the first blower 68 was described. However, the configuration for adjusting the ammonia concentration in the gas phase is not limited to the configuration of the first embodiment. A second modification of the first embodiment will be described below with reference to the drawings. In this description of the second modification, the same reference numerals are used for the same parts as in the first embodiment described above, and redundant explanations are omitted. Figure 3 is a diagram corresponding to Figure 2 in the second modification of the first embodiment of this disclosure.

[0052] As shown in Figure 3, the float 1 of this second modified example is equipped with a gas-phase ammonia concentration adjustment unit 166 in place of the exhaust gas dilution unit 73 and gas-phase ammonia concentration adjustment unit 66 of the first embodiment. This gas-phase ammonia concentration adjustment unit 166 is equipped with a first dilution gas supply line 167 and a first valve 69. The first dilution gas supply line 167 in this second modified example differs from the first dilution gas supply line 67 of the first embodiment only in that it does not have a first blower 68. Similarly, the second dilution gas supply line 174 differs from the second dilution gas supply line 74 of the first embodiment only in that it does not have a second blower 75.

[0053] The atmospheric release line 170 comprises an release line body 71, an atmospheric release valve 72, and a third blower 81. In other words, the atmospheric release line 170 in this second modified example differs from the atmospheric release line 70 of the first embodiment in that it includes a third blower 81. The third blower 81 is located in the middle of the open line body 71 of the atmospheric release line 170 and is capable of drawing in gaseous gas and sending it out into the atmosphere. The second dilution gas supply line 174 is connected to the open line body 71 between the third blower 81 and the recovery tank 65. The second dilution gas supply line 174 is capable of adding air or an inert gas to the gas flowing in the atmospheric release line 70. The second valve 76 opens and closes the flow path in the second dilution gas supply line 174.

[0054] In the second modification of the first embodiment described above, similar to the first embodiment, ammonia is absorbed into the absorbent by the reactor 63 to produce an ammonia absorbent W. This ammonia absorbent W is then stored in the recovery tank 65, and the ammonia absorbed into the ammonia absorbent W stored in the recovery tank 65 is gradually released into the gas phase due to the partial pressure difference between the gas and liquid phases.

[0055] When the third blower 81 is activated from the above state, the gas phase is drawn in through the atmospheric release line 170. At this time, the first valve 69 of the first dilution gas supply line 167 is opened, and air or inert gas is drawn into and introduced into the gas phase of the recovery tank 65. As a result, the ammonia concentration in the gas phase decreases. On the other hand, when the third blower 81 is stopped, the ammonia concentration in the gas phase is maintained.

[0056] Furthermore, if the ammonia concentration of the gas phase flowing into the flow path of the atmospheric release line 170 is high, the second valve 76 can be opened to allow air or an inert gas to be added to the gas phase flowing into the atmospheric release line 70. This suppresses the release of gas with a high ammonia concentration into the atmosphere. Therefore, this second modification makes it possible to adjust the solubility of the ammonia absorbent liquid W in the same way as in the first embodiment while reducing the number of blowers compared to the first embodiment.

[0057] (Third modified example of the first embodiment) In the first embodiment described above, if the ammonia concentration of the mixed gas introduced by the ammonia introduction section 61 is high, the ammonia gas may be absorbed by the absorbent liquid, potentially causing the internal space of the reactor 63 to become a pressure lower than atmospheric pressure (in other words, a negative pressure). In such a case, fluid may flow back from the recovery tank 65, where the gas phase is at normal pressure, into the reactor 63 via the ammonia absorbent liquid discharge line 64. Therefore, to prevent this backflow, a check valve may be provided in the ammonia absorbent liquid discharge line 64, or a pressure equalizing device may be provided to equalize the pressure in the internal space of the reactor 63 and the pressure of the gas phase in the recovery tank 65.

[0058] (Fourth modification of the first embodiment) In the first embodiment described above, the case where the recovery tank 65 is a ballast tank that is a normal pressure tank was explained as an example. The case where the internal space of the reactor 63 is at approximately atmospheric pressure or negative pressure was also explained. However, the configuration of the recovery tank 65 and reactor 63 is not limited to these. A fourth modification of the first embodiment will be described below with reference to the drawings. In this description of the fourth modification, the same reference numerals are used for the same parts as in the first embodiment described above, and redundant explanations are omitted. Figure 4 is a diagram corresponding to Figure 2 in the fourth modification of the first embodiment of this disclosure.

[0059] As shown in Figure 4, in this fourth modified example, the float 1 replaces the reactor 63 of the first embodiment with a pressurized reactor 163. The reactor 163 is equipped with a first pressure sensor 90, and the inert gas discharge line 77 is equipped with an inert gas discharge valve 91 whose opening can be adjusted based on the detection result of the first pressure sensor 90. In this fourth modified example, the first pressure sensor 90 and the inert gas discharge valve 91 are used to pre-set the pressure in the internal space of the reactor 163 to a predetermined pressure that is higher than the gas phase pressure of the recovery tank 165. Furthermore, the absorbent liquid introduction section 62 is equipped with an absorbent liquid introduction valve 92, which prevents gas inside the reactor 163 from flowing into the absorbent liquid introduction section 62 when the absorbent liquid is not being introduced into the reactor 163. The first pressure adjustment section of this disclosure is composed of the first pressure sensor 90 and the inert gas discharge valve 91 described above.

[0060] In this fourth modified example, the floating body 1 further replaces the recovery tank 65 of the first embodiment with a pressurized recovery tank 165. In addition, in this fourth modified example, the first blower 68 of the first embodiment is replaced with a first compressor 168.

[0061] According to the fourth modified example of the first embodiment described above, the floating body 1, first, the first valve 69 and the atmospheric release valve 72 are closed. The inert gas discharge valve 91 is initially closed and functions as a so-called relief valve, opening when the pressure in the internal space of the reactor 163 reaches a predetermined upper limit.

[0062] In this state, when a mixed gas containing ammonia gas is introduced into the reactor 163 through the ammonia introduction section 61, the pressure inside the reactor 163 gradually increases. When the pressure inside the reactor 163 reaches a predetermined pressure, the absorbent liquid introduction valve 92 is opened to introduce the absorbent liquid into the reactor 163. As a result, ammonia is absorbed into the absorbent liquid under a high-pressure environment higher than atmospheric pressure, and ammonia absorbent liquid W is produced. The ammonia solubility of the ammonia absorbent liquid W produced under this high-pressure environment is higher than the ammonia solubility of the ammonia absorbent liquid W produced at atmospheric pressure. This ammonia absorbent liquid W is stored in the recovery tank 165 via the ammonia absorbent liquid discharge line 64.

[0063] On the other hand, in the recovery tank 165, with the first valve 69 open, air or inert gas is pumped into the recovery tank 165 by the first compressor 168. The gas phase pressure in the recovery tank 165 is set to a predetermined pressure, for example, higher than atmospheric pressure and lower than the pressure in the internal space of the reactor 163. In other words, by keeping the pressure inside the recovery tank 165 higher than atmospheric pressure, it is possible to maintain a state in which the solubility of ammonia in the ammonia absorbent W is increased. In the fourth modified example, the gas phase ammonia concentration adjustment unit 166 is composed of the first dilution gas supply line 67, the first compressor 168, and the first valve 69. Furthermore, the second pressure adjustment unit of this disclosure is composed of the atmospheric release valve 72 and the first compressor 168.

[0064] According to this fourth modification, by creating a high-pressure environment inside the reactor 163, the ammonia solubility of the ammonia absorbent W produced in the reactor 163 can be increased. As a result, it becomes possible to absorb more ammonia with the same amount of absorbent. Therefore, if the size of the recovery tank 165 is kept constant, it becomes possible to temporarily store more ammonia in the recovery tank 165.

[0065] Furthermore, by adjusting, for example, the opening of the atmospheric release valve 72 and the opening of the first valve 69, the flow rate of the discharged gas from the recovery tank 165 can be made smaller than the flow rate of the diluent gas introduced into the recovery tank 165, thereby releasing the gas phase into the atmosphere via the atmospheric release line 70 while maintaining the pressure inside the recovery tank 165 at a level higher than atmospheric pressure.

[0066] In this fourth modified example, as with the first embodiment described above, the gas flowing into the atmospheric release line 70 can be diluted by the exhaust gas dilution unit 73.

[0067] (Fifth modification of the first embodiment) In the first embodiment described above, a configuration was described in which the gas-phase ammonia concentration adjustment unit 66 adjusts the ammonia concentration in the gas phase of the recovery tank 65 to adjust the ammonia solubility in the ammonia absorbent liquid W. In the fourth modification of the first embodiment described above, a case was described in which the gas-phase ammonia concentration adjustment unit 166 adjusts the pressure in the gas phase of the recovery tank 65 to adjust the ammonia solubility in the ammonia absorbent liquid W. However, the configuration for adjusting the ammonia solubility of the ammonia absorbent liquid W stored in the recovery tank 65 is not limited to these first embodiments and the fourth modification of the first embodiment.

[0068] Figure 5 is a diagram corresponding to Figure 2 in the fifth modified example of the first embodiment of this disclosure. For example, as shown in the fifth modified example in Figure 5, the ammonia absorption solution may be configured to adjust the solubility of ammonia by including an absorption solution temperature adjustment unit 82 for adjusting the temperature of the ammonia absorption solution W. This absorption solution temperature adjustment unit 82 is capable of heating the ammonia absorption solution W and cooling the ammonia absorption solution W. When the temperature of the ammonia absorption solution W is high, the rate at which the ammonia absorbed in the ammonia absorption solution W is released into the gas phase can be increased, while when the temperature of the ammonia absorption solution W is low, the rate at which the ammonia absorbed in the ammonia absorption solution W is released into the gas phase can be decreased.

[0069] (Other variations of the first embodiment) In the fifth modified example described above, a configuration was explained in which the solubility of the ammonia absorbent W can be adjusted by adjusting the temperature of the ammonia absorbent W to control the rate of ammonia release from the ammonia absorbent W. However, the configuration for adjusting the ammonia solubility of the ammonia absorbent W is not limited to the configuration of the fifth modified example. For example, the ammonia solubility may be adjusted by adjusting the pH of the ammonia absorbent W or by introducing a weakly acidic liquid or gas into the gas phase. Furthermore, the solubility of ammonia may be adjusted by appropriately combining a configuration for adjusting the ammonia concentration in the gas phase, a configuration for adjusting the temperature of the ammonia absorbent W, a configuration for adjusting the pH of the ammonia absorbent W, a configuration for adjusting the pH of the gas phase, and a configuration for adjusting the pressure of the gas phase.

[0070] [Second Embodiment] Next, the float 1 in the second embodiment of this disclosure will be described with reference to the drawings. This second embodiment differs only in that it enables batch processing in the reactor of the fourth modified example of the first embodiment described above. Therefore, in this second embodiment, Figure 1 will be used as a reference, and the same parts as in the fourth modified example of the first embodiment described above will be denoted by the same reference numerals, and redundant explanations will be omitted.

[0071] Figure 6 is a diagram corresponding to Figure 5 in the second embodiment of this disclosure. The floating body 1 of the second embodiment comprises a floating body body 2, a superstructure 4, a combustion device 8, an ammonia tank 10, a piping system 20, a compartment 30, and an ammonia abatement device 160. As shown in Figure 6, the ammonia abatement device 160 includes an ammonia introduction unit 61, an absorbent liquid introduction unit 62, a reactor 163, a recirculation line 93, an ammonia absorbent liquid discharge line 164, a recovery tank 165, a gas phase ammonia concentration adjustment unit 166, an open-atmosphere line 70, an exhaust gas dilution unit 73, and an ammonia absorbent liquid supply line 80. The configurations of the ammonia introduction unit 61, the absorbent liquid introduction unit 62, the reactor 163, the recovery tank 165, the gas phase ammonia concentration adjustment unit 66, the open-atmosphere line 70, the exhaust gas dilution unit 73, and the ammonia absorbent liquid supply line 80 are the same as those of the fourth modified example of the first embodiment described above, so a detailed explanation is omitted.

[0072] The recirculation line 93 returns the ammonia absorbent W produced by the reactor 163 to the absorbent liquid inlet 62. The recirculation line 93 comprises a recirculation line body 94, a first recirculation valve 95, a second recirculation valve 96, and a recirculation pump 97. The recirculation line body 94 is a pipe that guides the ammonia absorbent W, and one end of the recirculation line body 94 is connected to the bottom of the reactor 163. The other end of the recirculation line 93 is connected to the absorbent liquid inlet 62. The recirculation pump 97 is installed in the middle of the recirculation line body 94 and is capable of sending the ammonia absorbent W from the reactor 163 to the absorbent liquid inlet 62. The first recirculation valve 95 is provided on the recirculation line body 94 on one end side of the recirculation pump 97, and the second recirculation valve 96 is provided on the recirculation line body 94 on the other end side.

[0073] The recirculation pump 97 is driven only when recirculating the ammonia absorbent liquid W. Furthermore, the first recirculation valve 95 and the second recirculation valve 96 are opened only when recirculating the ammonia absorbent liquid W, and closed at all other times.

[0074] The ammonia absorbent liquid discharge line 164 guides the ammonia absorbent liquid W discharged from the reactor 163 to the recovery tank 165. The ammonia absorbent liquid discharge line 164 comprises a discharge line body 98 and a discharge valve 99. The discharge line body 98 is a pipe that guides the ammonia absorbent liquid W and is branched and connected to the recirculation line body 94 between the first recirculation valve 95 and the reactor 163. The discharge valve 99 opens and closes the flow path of the discharge line body 98. The discharge valve 99 is open only when guiding the ammonia absorbent liquid W to the recovery tank 165, and closed at other times, for example, when it is being recirculated by the recirculation line 93.

[0075] The absorbent liquid introduction section 62 has an absorbent liquid introduction valve 92 located upstream of the other end of the recirculation line body 94 in the direction of absorbent liquid flow. This absorbent liquid introduction valve 92 is closed when recirculation is being performed by the recirculation line 93. This prevents the ammonia absorbent liquid W flowing in from the recirculation line body 94 from flowing back to the upstream side of the absorbent liquid introduction section 62. A check valve or the like may be provided instead of the absorbent liquid introduction valve 92.

[0076] In this second embodiment, the system further includes a pH detection unit 100 that measures the pH of the ammonia absorbent W as a state quantity produced in the reactor 163, and a liquid level detection unit 101 that measures the liquid level of the ammonia absorbent W as a state quantity in the reactor 63. The first recirculation valve 95, the second recirculation valve 96, the recirculation pump 97, the discharge valve 99, and the absorbent liquid introduction valve 92 are controlled based on the measurement results of the pH detection unit 100 and the liquid level detection unit 101. In this second embodiment, the pH detection unit 100, the liquid level detection unit 101, and a switching control unit (not shown) are integrally formed, and this switching control unit controls the opening and closing of the first recirculation valve 95, the second recirculation valve 96, the discharge valve 99, and the absorbent liquid introduction valve 92, as well as the driving control of the recirculation pump 97.

[0077] The ammonia solubility of the ammonia absorbent W produced by the reactor 163 can be determined, for example, based on the measurement results of the pH detection unit 100, using a table, map, formula, etc., of ammonia solubility and pH that has been determined in advance by experiments or simulations. The switching control unit recirculates the ammonia absorbent W through the recirculation line 93 until the determined ammonia solubility exceeds a predetermined level and the liquid level of the ammonia absorbent W exceeds a predetermined level. On the other hand, when the ammonia solubility exceeds a predetermined level and the liquid level of the ammonia absorbent W exceeds a predetermined level, the switching control unit directs the ammonia absorbent W into the ammonia absorbent discharge line 164 instead of the recirculation line 93, and introduces the ammonia absorbent W into the recovery tank 165.

[0078] (Effects and Benefits) According to the second embodiment described above, the solubility of ammonia in the ammonia absorbent solution W can be increased, making it possible to concentrate ammonia to a high concentration. As a result, the amount of absorbent solution used to absorb ammonia can be reduced.

[0079] In this description of the second embodiment, the configuration of the fourth modified example of the first embodiment was described using the addition of a configuration for batch processing in the reactor 163 as an example. However, the configuration for batch processing may also be added to the configuration of the first embodiment and the first to fifth modified examples of the first embodiment. Furthermore, although the case in which the ammonia absorbent W is recirculated by the recirculation line 93 was described, the ammonia absorbent W recovered in the recovery tank 165 may be returned to the absorbent introduction section 62. In this case, the ammonia absorbent W with the desired ammonia concentration can be easily obtained in conjunction with the release of ammonia into the gas phase of the recovery tank 165, which is advantageous when using the ammonia absorbent W in other devices.

[0080] [Third Embodiment] Next, the float 1 in the third embodiment of this disclosure will be described with reference to the drawings. This third embodiment differs from the first embodiment described above only in that it introduces ammonia leaked in the compartment 30 containing the ammonia-related equipment into the reactor. Therefore, in this third embodiment, Figure 1 will be used as a reference, and the same parts as in the first embodiment described above will be denoted by the same reference numerals, and redundant explanations will be omitted.

[0081] Figure 7 is a diagram corresponding to Figure 2 in the third embodiment of this disclosure. The floating body 1 of the third embodiment comprises a floating body body 2, a superstructure 4, a combustion device 8, an ammonia tank 10, a piping system 20, a compartment 30, and an ammonia abatement device 260.

[0082] As shown in Figure 7, the ammonia abatement device 260 includes a recovery tank 65, an ammonia introduction unit 261, a gas phase ammonia concentration adjustment unit 66, and an exhaust gas dilution unit 73.

[0083] The ammonia introduction section 261, like the ammonia introduction section 61 in the first embodiment, introduces ammonia from the floating body 2 into the reactor 63. The ammonia introduction section 261 in this third embodiment is capable of communicating with compartment 30. The ammonia introduction section 261 is designed to introduce gaseous ammonia that has leaked and vaporized in compartment 30 into the reactor 63 as ammonia from the floating body 2. The floating body 1 in this third embodiment is provided with an air supply system 31 and an exhaust system 32 for ventilating compartment 30. The air supply system 31 comprises an air supply damper 33 and an air supply duct 34. The exhaust system 32 comprises an exhaust damper 35 and an exhaust duct 36.

[0084] The ammonia introduction section 261 comprises a line body 37, an introduction blower 38, an introduction blower inlet damper 39, and an introduction damper 41. The line body 37 is a pipe with a flow path inside. The introduction blower 38 is installed in the middle of the line body 37 and sends the gas inside the line body 37 toward the reactor 63. The introduction blower 38 is kept in a continuously operating state. For example, a variable-speed blower can be used as the introduction blower 38.

[0085] The introduction blower inlet damper 39 is installed in the inlet side of the line body 37, which is closer to the compartment 30 than the introduction blower 38, and opens and closes the flow path of the line body 37. The introduction damper 41 is installed in the line body 37 between the introduction blower 38 and the reactor 63, and opens and closes the flow path of the line body 37.

[0086] For example, under normal circumstances when no ammonia leak occurs in compartment 30, the exhaust damper 35, the intake fan inlet damper 39, and the supply air damper 33 are opened by the workers, while the intake damper 41 is closed. This allows outside air to be drawn into compartment 30 from the supply air equipment 31, and the air inside compartment 30 is released to the outside of the floating body 2 through the line body 37 and the exhaust duct 36. In other words, compartment 30 is ventilated.

[0087] On the other hand, if an ammonia leak occurs within compartment 30, for example, the exhaust damper 35 is closed by a worker, and the supply air damper 33, the inlet blower damper 39, and the inlet damper 41 are opened. At this time, at least one of the openings of the supply air damper 33, the inlet blower damper 39, and the inlet damper 41, and the rotation speed (in other words, airflow) of the inlet blower 38 are adjusted so that the pressure inside compartment 30 is lower than atmospheric pressure. By making the pressure inside compartment 30 lower than atmospheric pressure in this way, ammonia leakage outside compartment 30 is suppressed.

[0088] (Effects and Benefits) In the third embodiment described above, the ammonia introduction unit 261 introduces ammonia leaked in compartment 30 into the reactor 63. Therefore, it is possible to remove the ammonia leaked in compartment 30 and to detoxify the ammonia absorbent liquid W that has absorbed the ammonia. As a result, it is possible to detoxify the ammonia absorbent liquid W that has absorbed the ammonia while suppressing an increase in the burden on workers and fuel consumption. Furthermore, by branching the exhaust duct 36 of the exhaust equipment 32 to the line body 37, ventilation within compartment 30 and ammonia removal within compartment 30 can be performed by a single introduction blower 38. Therefore, an increase in the number of parts can be suppressed.

[0089] (Modified version of the third embodiment) In the third embodiment described above, the case in which the exhaust duct 36 of the exhaust equipment 32 is branched and connected to the line body 37 of the ammonia introduction unit 261 was explained as an example. However, the configuration of the exhaust equipment is not limited to the configuration of the third embodiment described above. For example, other exhaust equipment having an exhaust fan may be directly connected to the compartment 30. Also, in the third embodiment, the case in which an introduction fan inlet damper 39 is provided on the line body 37 was described, but the introduction fan inlet damper 39 may be omitted. Furthermore, in the third embodiment, the configuration in which the ammonia introduction unit 61 of the ammonia abatement device 60 of the first embodiment is replaced with an ammonia introduction unit 261 was explained as an example, but the ammonia introduction unit 261 is also applicable to the various modifications of the first embodiment and the second embodiment described above.

[0090] [Fourth Embodiment] Next, the float 1 in the fourth embodiment of this disclosure will be described with reference to the drawings. This fourth embodiment differs from the embodiments and modifications described above only in that the ammonia absorbent liquid W stored in the recovery tank is used for denitrification treatment of the exhaust gas. Therefore, in this fourth embodiment, Figure 1 will be used with reference, and the same parts as in the first embodiment described above will be denoted by the same reference numerals, and redundant explanations will be omitted.

[0091] (Configuration around the denitrification device) Figure 8 shows the piping system around the ammonia solution tank for denitrification in a denitrification apparatus according to the fourth embodiment of this disclosure. As shown in Figures 1 and 8, the floating body 1 of the fourth embodiment comprises a floating body 2, a combustion device 8, an ammonia tank 10, a piping system 20, an ammonia introduction section 61, an absorbent liquid introduction section 62, a reactor 63, a recovery tank 65, an atmospheric outlet line 70, an exhaust pipe 102, a denitrification device 103, ammonia solution tank for denitrification 104, ammonia solution supply line for denitrification 105, an ammonia absorbent liquid supply line 180, and a liquefied ammonia supply line 106. The combustion device 8 of this fourth embodiment is the main engine that propels the floating body 2.

[0092] The exhaust pipe 102 guides the exhaust gas G discharged from the combustion device 8 to the outside of the floating body 2. The exhaust gas G flowing through this exhaust pipe 102 immediately after being discharged from the combustion device 8 contains nitrogen oxides.

[0093] The denitrification device 103 denitrifies the exhaust gas G discharged from the combustion device 8. This denitrification device 103 is a selective catalytic reduction denitrification (SCR) device, which converts nitrogen oxides into nitrogen and water using a catalyst. This denitrification device 103 is installed in the middle of the exhaust pipe 102, and the exhaust gas G, to which a denitrification ammonia solution has been sprayed, is brought into contact with a catalyst (not shown). The denitrified exhaust gas G is then released into the atmosphere, for example, through a funnel (not shown) provided on the floating body 2.

[0094] The ammonia solution tank 104 stores the ammonia solution used in the denitrification apparatus 103. In this embodiment, the ammonia solution is aqueous ammonia adjusted to a predetermined ammonia concentration (for example, several tens of percent) necessary for use as a reducing agent in the denitrification apparatus 103. The ammonia solution tank 104 may be equipped with a liquid level meter or the like to measure the amount of ammonia solution stored.

[0095] The ammonia solution tank 104 for denitrification in this embodiment includes a circulation pipe 107 for stirring the ammonia solution for denitrification and a stirring pump 108. The circulation pipe 107 is equipped with a concentration meter 109 for measuring the ammonia concentration of the ammonia solution for denitrification stored in the ammonia solution tank 104.

[0096] In this fourth embodiment, a configuration in which the denitrification ammonia solution is stirred by a circulation pipe 107 and a stirring pump 108 is illustrated. However, instead of providing the circulation pipe 107 and the stirring pump 108, a stirrer of another type may be provided in the denitrification ammonia solution tank 104. Furthermore, the above-described configuration for stirring the denitrification ammonia solution may be provided only as needed, and can be omitted, for example. If a configuration for stirring the denitrification ammonia solution is not provided, a concentration meter 109 for measuring the ammonia concentration of the denitrification ammonia solution may be provided in the denitrification ammonia solution tank 104.

[0097] The ammonia denitrification solution supply line 105 forms a channel for supplying the ammonia denitrification solution stored in the ammonia denitrification solution tank 104 to the denitrification device 103. The ammonia denitrification solution supply line 105 is equipped with an ammonia denitrification solution pump 110.

[0098] The ammonia absorbent liquid supply line 180 forms a flow path that supplies the ammonia absorbent liquid W stored in the recovery tank 65 to the denitrification ammonia solution tank 104. An ammonia absorbent liquid supply pump 111 is provided in this ammonia absorbent liquid supply line 180. Here, the ammonia concentration of the ammonia absorbent liquid W stored in the recovery tank 65 is lower than the ammonia concentration of the denitrification ammonia solution described above (for example, a few ppm to a few percent).

[0099] The liquefied ammonia supply line 106 includes a first line 106A that supplies liquefied ammonia stored in the ammonia tank 10 to the ammonia buffer tank 40, and a second line 106B that supplies liquefied ammonia stored in the ammonia tank 10 to the ammonia denitrification solution tank 104. As described above, the ammonia stored in the ammonia tank 10 is liquefied ammonia, and therefore has a higher ammonia concentration than the ammonia absorbent W. In this embodiment, the second line 106B is shown as being branched off from the first line 106A, but the second line 106B only needs to be able to supply liquefied ammonia to the ammonia denitrification solution tank 104, and for example, it may be connected to the ammonia tank 10 and the ammonia denitrification solution tank 104.

[0100] In this embodiment, the second line 106B is provided with a flow control valve 112 that can adjust the flow rate of liquefied ammonia flowing from the first line 106A to the second line 106B. The flow control valve 112 is designed to allow gradual adjustment of its opening from a fully closed state to a fully open state. The opening of the flow control valve 112 may be operated manually by an operator, or it may be automatically adjusted by a control device (not shown) based on the ammonia concentration measurement result from a concentration meter 109, for example.

[0101] In this embodiment, the first line 106A is provided with a supply pump 113 that supplies liquefied ammonia to the combustion device 8, on the side closer to the ammonia tank 10 than the branching point P1 of the second line 106B. In other words, the second line 106B illustrated in this embodiment branches off from the first line 106A between the supply pump 113 and the ammonia buffer tank 40. A pump that supplies liquefied ammonia to the denitrification ammonia solution tank 104 may also be provided in the second line 106B.

[0102] Furthermore, the supply pipe 21 of this embodiment is equipped with an ammonia pressurizing pump 114 and an ammonia heat exchanger 115, which are not shown in Figure 2. The ammonia pressurizing pump 114 pressurizes the ammonia supplied from the ammonia buffer tank 40 to the combustion device 8. The ammonia heat exchanger 115 adjusts the temperature of the ammonia pressurized by the ammonia pressurizing pump 114. In this embodiment, the ammonia buffer tank 40 is connected to the ammonia introduction section 61 via a buffer tank vent pipe 116. This makes it possible to supply the vent gas from the ammonia buffer tank 40 to the ammonia abatement device 60. In other words, the ammonia contained in the vent gas from the ammonia buffer tank 40 can also be absorbed into the absorbent liquid by the reactor 63.

[0103] (Effects and Benefits) The floating body 1 of the fourth embodiment described above includes a combustion device 8 that burns fuel and discharges exhaust gas G, a denitrification device 103 that denitrifies the exhaust gas G discharged from the combustion device 8, a denitrification ammonia solution tank 104 that stores a denitrification ammonia solution used as a reducing agent in the denitrification device 103, and an ammonia absorbent liquid supply line 180 that supplies the ammonia absorbent liquid W stored in the recovery tank 65 to the denitrification ammonia solution tank 104.

[0104] With this floating body 1, the ammonia absorbent liquid W generated by the ammonia abatement device 60 can be supplied to the denitrification ammonia solution tank 104 via the ammonia absorbent liquid supply line 180. Therefore, the denitrification ammonia solution can be generated in the denitrification ammonia solution tank 104 using the ammonia absorbent liquid W, and this denitrification ammonia solution in the denitrification ammonia solution tank 104 can be used as a reducing agent in the denitrification device 103. Thus, the ammonia absorbent liquid W can be effectively utilized. As a result, the recovery tank 65 can be made smaller.

[0105] The floating body 1 of the fourth embodiment described above further includes an ammonia tank 10 in which liquefied ammonia is stored, and a liquefied ammonia supply line 106 that supplies the liquefied ammonia from the ammonia tank 10 to a denitrification ammonia solution tank 104. Therefore, by mixing liquefied ammonia with a higher ammonia concentration than the ammonia solution for denitrification with the ammonia absorbent W supplied to the ammonia absorbent W tank 104, it is possible to produce an ammonia solution for denitrification with a higher ammonia concentration than the ammonia absorbent W.

[0106] Furthermore, in the fourth embodiment described above, since the ammonia absorbent liquid W, which is obtained by absorbing the ammonia in the floating body 2 into the absorbent liquid, is used as part of the ammonia solution for denitrification to denitrify the exhaust gas G of the combustion device 8, it becomes possible to effectively utilize the ammonia released into the atmosphere from the recovery tank 65 via the atmospheric release line 70 as a reducing agent for the denitrification device 103. Therefore, the cost of producing the ammonia solution for denitrification can be reduced compared to the case where ammonia is prepared separately to produce the ammonia solution for denitrification.

[0107] Furthermore, in the fourth embodiment described above, since the ammonia solubility of the ammonia absorbent liquid W stored in the recovery tank 65 can be adjusted within the recovery tank 65, the ammonia absorbent liquid W with the desired ammonia solubility can be supplied to the denitrification ammonia solution tank 104 to produce a denitrification ammonia solution. Therefore, the complexity of the process for producing the denitrification ammonia solution can be suppressed. In addition, since the fuel ammonia can be diluted with the ammonia absorbent liquid W, it is possible to reduce the amount of fresh water used in the fresh water tank provided in the floating body 2 when producing the denitrification ammonia solution, or to reduce the amount of water produced by the water production device. Therefore, it is possible to reduce the volume of the fresh water tank and the capacity of the water production device, and to suppress the enlargement of the floating body 2.

[0108] (Modification of the fourth embodiment) In the above embodiment, the case in which liquefied ammonia as fuel stored in the ammonia tank 10 is supplied to the ammonia solution tank 104 for denitrification was described. However, the ammonia solution tank 104 for denitrification may be supplied with liquefied ammonia from an ammonia tank provided separately from the ammonia tank 10 for fuel.

[0109] In the fourth embodiment described above, the case in which the combustion device 8 is a main engine that uses ammonia as fuel was explained. However, the combustion device 8 can be any device that burns fuel and discharges exhaust gas G, for example, a combustion device that burns a fuel other than ammonia and discharges exhaust gas G, or a combustion device that can switch between ammonia and a fuel other than ammonia. When the combustion device burns a fuel other than ammonia and discharges exhaust gas G, a separate ammonia tank for storing liquefied ammonia that is not fuel can be provided, and liquefied ammonia can be supplied from this separate ammonia tank to the denitrification ammonia solution tank 104.

[0110] [Fifth Embodiment] Next, the float 1 in the fifth embodiment of this disclosure will be described with reference to the drawings. This fifth embodiment differs from the embodiments and modifications described above in that it is equipped with a dilution tank. Therefore, in this fifth embodiment, Figure 1 will be used as a reference, and the same parts as in the first embodiment described above will be denoted by the same reference numerals, and redundant explanations will be omitted. Note that the dilution tank in this fifth embodiment is also applicable to the modifications of the first embodiment and to the second to fourth embodiments. (Structure of the floating body) As shown in Figure 1, the floating body 1 of this embodiment comprises a floating body body 2, a superstructure 4, a combustion device 8, an ammonia tank 10, a piping system (fuel line) 20, a compartment 30, and an ammonia abatement device 360.

[0111] (Configuration of ammonia removal system) Figure 9 shows a schematic configuration of a fuel purging piping system and an ammonia abatement device in the fifth embodiment of this disclosure. As shown in Figure 9, the ammonia abatement device 360 ​​includes a dilution tank 300, an introduction line 301, a dilution air introduction section 305, a bypass line 309, an ammonia introduction section 361, an absorbent liquid introduction section 62, a reactor 63, an ammonia absorbent liquid discharge line 64, a recovery tank 65, a gas phase ammonia concentration adjustment section 66, an open-atmosphere line 70, an exhaust gas dilution section 73, and an ammonia absorbent liquid supply line 80. Note that the recovery tank 65, the gas phase ammonia concentration adjustment section 66, the open-atmosphere line 70, the exhaust gas dilution section 73, and the ammonia absorbent liquid supply line 80 are the same as in the first embodiment, so a detailed explanation is omitted.

[0112] The dilution tank 300 is provided in the floating body 2 and stores an absorbent liquid capable of absorbing ammonia. In this embodiment, the dilution tank 300 is a ballast tank provided in the floating body 2. The water surrounding the floating body 2 (e.g., seawater, freshwater) can be introduced into the dilution tank 300 by a pump (not shown) and stored as the absorbent liquid. In other words, both an absorbent liquid (liquid phase) and a gas phase exist in the dilution tank 300. The pressure of the gas phase in the dilution tank 300 can be atmospheric pressure or a pressure higher than atmospheric pressure. Note that the dilution tank 300 is not limited to a ballast tank, but may be, for example, a seawater tank or a freshwater tank provided separately from the ballast tank.

[0113] A mixture of ammonia gas and inert gas is introduced into the liquid phase of the dilution tank 300 from the residual ammonia supply line 25 described above. The introduction line 301 introduces ammonia gas into the dilution tank 300. The introduction line 301 is equipped with a diffuser pipe 302 that releases the mixture containing ammonia gas into the liquid phase of the dilution tank 300 as small bubbles.

[0114] In this embodiment, the introduction line 301 is connected to the ammonia temporary storage unit 27 described above, and the gaseous ammonia separated or vaporized in the ammonia temporary storage unit 27 is introduced into the liquid phase as ammonia in the float body 2. The diffuser pipe 302 in this embodiment extends along the bottom surface of the dilution tank 300 and is formed so that the bubbles released from the diffuser pipe 302 spread throughout the absorbent liquid in the liquid phase. In this embodiment, the gas released from the diffuser pipe 302 is released into the absorbent liquid using the pressure of the inert gas supply device 50. However, the configuration is not limited to releasing into the absorbent liquid using the pressure of the inert gas; for example, a blower or the like may be provided at the outlet of the ammonia temporary storage unit 27.

[0115] The dilution air introduction unit 305 adjusts the concentration of ammonia gas in the gas phase of the dilution tank 300. Here, the gas phase and the absorbent liquid (liquid phase) of the dilution tank 300 attempt to reach a gas-liquid equilibrium state. In other words, as the ammonia concentration in the ammonia absorbent liquid W, which is the absorbent liquid that has absorbed ammonia, increases, the ammonia concentration in the gas phase also gradually increases. On the other hand, as the ammonia concentration in the gas phase decreases, the ammonia in the liquid phase is released due to the partial pressure difference and sequentially supplied to the gas phase, thus decreasing the ammonia solubility of the ammonia absorbent liquid W. In other words, the dilution air introduction unit 305 can also be called a solubility adjustment unit.

[0116] The dilution air introduction section 305 has the same configuration as the gas phase ammonia concentration adjustment section 66 of the first embodiment described above, and includes a first dilution gas supply line 306, a first blower 307, and a first valve 308. The first dilution gas supply line 306 is a pipe that can introduce air or an inert gas into the gas phase of the dilution tank 300. In this embodiment, the first dilution gas supply line 306 is capable of introducing air into the gas phase of the dilution tank 300. The upper end of the first dilution gas supply line 306 opens, for example, above the upper deck 7, and the lower end of the first dilution gas supply line 306 is connected to the upper wall of the dilution tank 300. When the first dilution gas supply line 306 introduces an inert gas, it may be supplied by an inert gas supply device 50.

[0117] The bypass line 309 is branched to the introduction line 301 and also merged to the ammonia introduction section 361. In other words, the bypass line 309 bypasses the ammonia supplied by the introduction line 301 to the ammonia introduction section 361 without passing through the dilution tank 300. The bypass line 309 is equipped with a bypass valve 310. On the other hand, the introduction line 301 is provided with a valve 311, and the ammonia introduction section 361 is provided with a valve 312. These bypass valves 310, 311, and 312 allow switching between the flow from the introduction line 301 to the dilution tank 300 and the flow from the introduction line 301 to the bypass line 309. At this point, as the ammonia solubility in the liquid phase of the dilution tank 300 increases and the end of the fuel purge approaches, a gas with a low ammonia concentration (purge gas) is introduced into the liquid phase of the dilution tank 300. When a gas with a low ammonia concentration is introduced into a liquid phase with high ammonia solubility, ammonia is quickly released from the liquid phase to the gas phase. Therefore, in this fifth embodiment, the dilution tank 300 is bypassed by the bypass line 309, thereby suppressing a decrease in the ammonia solubility of the liquid phase in the dilution tank 300. Note that the bypass line 309 may be omitted.

[0118] The ammonia introduction section 361 is configured to allow the gaseous phase of the dilution tank 300 to be introduced into the reactor 63. In other words, the ammonia introduction section 361 is configured to allow the gaseous phase of the dilution tank 300 to communicate with the internal space of the reactor 63. The gaseous phase of the dilution tank 300 is pushed into the ammonia introduction section 361 by airflow from the first blower 307 of the dilution air introduction section 305. As a result, the gaseous phase of the dilution tank 300 is introduced into the reactor 63.

[0119] As described above, the ammonia concentration in the gas phase of the dilution tank 300 changes. In some cases, the ammonia concentration in the gas phase may be such that it can be released into the atmosphere. For this reason, for example, a discharge line (not shown) that branches off from the ammonia introduction section 361 and can be released into the atmosphere may be provided, allowing the gas in the gas phase of the dilution tank 300 to be switched between being supplied to the reactor 63 and released into the atmosphere.

[0120] (Effects and Benefits) According to the fifth embodiment, when the ammonia concentration of the gas flowing from the dilution tank 300 to the ammonia introduction section 361 is high, the reactor 63 can absorb the ammonia into the absorption liquid. Therefore, it is possible to suppress the release of high-concentration ammonia gas from the ammonia absorbent solution W in the dilution tank 300 into the atmosphere.

[0121] (First modified example of the fifth embodiment) In the fifth embodiment described above, a configuration was described in which the gas phase of the dilution tank 300 can be introduced into the reactor 63. However, the configuration is not limited to this, and for example, as shown in Figure 10, the arrangement of the dilution tank 300, the reactor 63, and the recovery tanks 65 and 165 may be swapped so that the gas phase of the recovery tanks 65 and 165 can be introduced into the liquid phase of the dilution tank 300. In this case, the dilution tank 300 should be provided with a discharge line 370 that has the same configuration as the atmospheric discharge line 70, that is, a discharge line that can release the gas phase of the dilution tank 300 into the atmosphere.

[0122] (Second modified example of the fifth embodiment) Furthermore, while the fifth embodiment described a case where ammonia from the residual ammonia supply line 25 is supplied to the dilution tank 300, the configuration is not limited to this. For example, the ammonia supplied to the dilution tank 300 may be ammonia contained in the gas discharged from the inert gas discharge line 77 of the reactor 63, or ammonia contained in the gas phase of the recovery tanks 65 and 165. Alternatively, it may be ammonia leaked in compartment 30, as in the third embodiment.

[0123] <Other Embodiments> Although embodiments of this disclosure have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments and may include design changes and the like that do not depart from the gist of this disclosure.

[0124] For example, in the above embodiments and modifications, the case in which the floating body 1 is a vessel capable of navigation by a main engine, etc., was described, but it is not limited to a vessel as long as it is a floating body capable of storing ammonia. In the above embodiments and modifications, the case in which the ammonia absorbed into the absorbent liquid by the reactor 63 is ammonia purged from the flow path R of the combustion device 8 and ammonia leaked in compartment 30 was described. However, the ammonia absorbed into the absorbent liquid by the reactor 63 is not limited to ammonia purged from the flow path R or ammonia leaked in compartment 30, but may also be unwanted ammonia generated in the floating body 1, etc.

[0125] Furthermore, the cases in the first to fourth embodiments and each of the modified examples where the atmospheric release lines 70 and 170 are open to the atmosphere have been described. However, before releasing gas into the atmosphere from the atmospheric release lines 70 and 170, ammonia contained in the gas flowing through the atmospheric release lines 70 may be removed by an ammonia removal device such as a scrubber. By doing so, it is 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 atmospheric release lines 70 is small, a small-capacity ammonia removal device such as a small scrubber can be used, and the reduction in the degree of freedom in installing the ammonia abatement devices 60, 160, and 260 within the floating body 2 can be suppressed.

[0126] In the first embodiment, ammonia discharged by purging is supplied to the ammonia introduction unit 61, and in the third embodiment, ammonia leaked into the compartment 30 is supplied to the ammonia introduction unit 261. However, for example, both ammonia introduction units 61 and 261 may be provided, and these ammonia introduction units 61 and 261 may be switched between as needed.

[0127] In the fourth modification of the first embodiment, the case in which the gas phase pressure of the recovery tank 165 is increased above atmospheric pressure was described. However, the pressure inside the reactor 163 may be increased only, and the gas phase pressure of the recovery tank 165 may not be increased, for example, to around atmospheric pressure.

[0128] In the third embodiment, a case was described in which an operator manually opens and closes the exhaust damper 35, the supply air damper 33, the inlet blower damper 39, and the inlet damper 41. However, the configuration is not limited to manual operation by an operator. For example, the opening and closing operations of the exhaust damper 35, the supply air damper 33, the inlet blower damper 39, and the inlet damper 41 may be automatically controlled by a control device based on the detection results of ammonia leakage, such as the ammonia concentration within the compartment 30.

[0129] <Note> The floating body 1 described in the embodiment can be understood, for example, as follows:

[0130] (1) According to the first embodiment, the floating body 1 comprises a floating body body 2 that floats on water, ammonia introduction sections 61, 261 into which ammonia from the floating body body 2 can be introduced, an absorbent liquid introduction section 62 into which an absorbent liquid capable of absorbing the ammonia can be introduced, reactors 63, 163 that generate an ammonia absorbent liquid W by reacting the ammonia from the ammonia introduction sections 61, 261 with the absorbent liquid from the absorbent liquid introduction section 62, recovery tanks 65, 165 into which the ammonia absorbent liquid W generated in the reactors 63, 163 and discharged from the reactors 63, 163 can be introduced and the ammonia absorbent liquid W can be stored, and atmospheric release lines 70, 170 that can release the gas phase in the recovery tanks 65, 165 to the atmosphere. Examples of absorbent liquids include seawater and freshwater. An example of a recovery tank 65,165 is a ballast tank.

[0131] This allows the reactors 63 and 163 to absorb the ammonia in the floating body 2 into the absorbent liquid. The ammonia absorbent liquid W, which has absorbed the ammonia, is then stored in the recovery tanks 65 and 165, and the ammonia is gradually released from the ammonia absorbent liquid W in the recovery tanks 65 and 165 into the gas phase, making it possible to release the gas with a low ammonia concentration into the atmosphere through the atmospheric release lines 70 and 170. Furthermore, the reactors 63 and 163 can increase the ammonia solubility of the ammonia absorbent liquid W without being affected by, for example, the partial pressure difference between the gas and liquid in the recovery tanks 65 and 165, thus suppressing the need to enlarge the recovery tanks 65 and 165 that store the ammonia absorbent liquid W. Furthermore, by utilizing the partial pressure difference between the liquid phase and the gas phase, almost all of the ammonia absorbed by the ammonia absorbent W can be released into the gas phase, effectively detoxifying the ammonia absorbent W. This eliminates the need to remove ammonia from the ammonia absorbent W using acids such as dilute sulfuric acid. Furthermore, a pilot light is not required to burn and detoxify the ammonia. Therefore, it is possible to detoxify the ammonia absorbent liquid W while suppressing the burden on workers and the increase in fuel consumption.

[0132] (2) The floating body 1 according to the second embodiment is the floating body 1 of (1), and is equipped with gas phase ammonia concentration adjustment units 66, 166 for adjusting the ammonia concentration of the gas phase of the recovery tanks 65, 165. This makes it possible to adjust the amount of ammonia released from the ammonia absorbent liquid W stored in the recovery tanks 65 and 165 into the gas phase of the recovery tanks 65 and 165. Therefore, it is possible to adjust the ammonia solubility of the ammonia absorbent liquid W stored in the recovery tanks 65 and 165.

[0133] (3) The floating body 1 according to the third embodiment is the floating body 1 of (1) or (2), and includes an exhaust gas dilution section 73 that can dilute the gas phase gas released into the atmosphere via the atmospheric release lines 70, 170 with a dilution gas. This prevents the release of gases with high ammonia concentrations into the atmosphere from atmospheric release lines 70 and 170.

[0134] (4) The float 1 according to the fourth embodiment is any one of the float 1s from (1) to (3), and is equipped with a first pressure adjustment unit capable of adjusting the pressure of the reactors 63,163. This allows the pressure inside reactors 63 and 663 to be increased. As a result, the solubility of ammonia in the absorbent liquid in reactors 63 and 663 can be further increased. Consequently, the amount of absorbent liquid required to absorb ammonia can be reduced. An example of a first pressure adjustment unit is a combination of a first pressure sensor 90 and an inert gas discharge valve 91.

[0135] (5) The floating body 1 according to the fifth embodiment is any one of the floating bodies 1 from (1) to (4), and is equipped with a second pressure adjustment unit capable of adjusting the pressure of the gas phase of the recovery tanks 65, 165. This increases the pressure inside the recovery tanks 65 and 165. As a result, the ammonia solubility of the ammonia absorbent liquid W stored in the recovery tanks 65 and 165 is further increased, making it possible to retain more ammonia in the recovery tanks 65 and 165. An example of a second pressure regulating section is a combination of an atmospheric release valve 72 and a first compressor 168.

[0136] (6) The floating body 1 according to the sixth embodiment is any one of the floating bodies 1 from (1) to (5), and is equipped with a temperature adjustment unit 82 capable of adjusting the temperature of the ammonia absorbent liquid W stored in the recovery tanks 65, 165. This makes it possible to adjust the rate at which ammonia is released from the ammonia absorbent liquid W into the gas phase of the recovery tanks 65 and 165.

[0137] (7) The float 1 according to the seventh embodiment is any one of the float 1 from (1) to (6), and includes a recirculation line 93 that returns the ammonia absorbent W produced by the reactors 63, 163 to the absorbent liquid introduction section 62, and a switching section that switches the destination of the ammonia absorbent W produced by the reactors 63, 163 to the absorbent liquid introduction section 62 and the recovery tanks 65, 165. This allows the ammonia absorbent W, which has absorbed ammonia via the recirculation line 93, to be reintroduced into the reactors 63 and 163, thereby significantly increasing the ammonia solubility of the ammonia absorbent W. The ammonia absorbent W with sufficiently increased ammonia solubility can then be stored in the recovery tanks 65 and 165. Therefore, if the amount of ammonia introduced from the ammonia introduction section 61 and 261 is kept constant, less absorbent liquid is needed to absorb ammonia, allowing the recovery tanks 65 and 165 to be made smaller. Furthermore, if the size of the recovery tanks 65 and 165 is kept constant, more ammonia can be stored in the recovery tanks 65 and 165. An example of a switching mechanism is a combination of a first recirculation valve 95 and a discharge valve 99.

[0138] (8) The float 1 according to the eighth embodiment is the float 1 according to (7), comprising state amount detection units 100, 101 for detecting the state amounts of the ammonia absorbent liquid W produced by the reactors 63, 163, and a switching control unit that controls the switching of the switching unit based on the detection results of the state amount detection units 100, 101. This allows for the detection of when the ammonia solubility has sufficiently increased based on the state of the ammonia absorbent W, making it possible to automatically store the ammonia absorbent W in the recovery tanks 65 and 165 when the ammonia solubility has reached a sufficient level.

[0139] (9) The floating body 1 according to the ninth embodiment is any one of the floating bodies 1 from (1) to (8), and is equipped with ammonia absorbent liquid supply lines 80, 180 that supply the ammonia absorbent liquid W stored in the recovery tanks 65, 165 to the outside of the recovery tanks 65, 165. This allows the ammonia absorbent liquid W stored in the recovery tanks 65 and 165 to be supplied to the outside of the recovery tanks 65 and 165. For example, when a floating body is docked, the ammonia absorbent liquid W can be unloaded and quickly treated for pollution. It can also be supplied to equipment that uses ammonia within the floating body 1, thus enabling the effective utilization of the ammonia absorbent liquid W.

[0140] (10) The floating body 1 according to the tenth embodiment is any one of the floating body 1 according to (1) to (9), comprising: a combustion device 8 that uses ammonia as fuel; an ammonia tank 10 for storing the ammonia as fuel; a fuel line 20 for supplying the ammonia from the ammonia tank 10 to the combustion device 8; an inert gas supply device 50 for supplying an inert gas into the fuel line 20; and a residual ammonia supply line 25 for discharging the ammonia in the fuel line 20 that has been pressed by the inert gas, wherein the ammonia introduction section 61,261 introduces the ammonia discharged by the residual ammonia supply line 25 into the reactors 63,163. This allows ammonia discharged from the residual ammonia supply line 25 to be absorbed into the absorbent solution in a short time, while the ammonia absorbed in the ammonia absorbent solution W can be gradually released into the gas phase in the recovery tanks 65 and 165. Therefore, it becomes unnecessary to quickly detoxify the ammonia purged from the combustion device 8, ammonia tank 10, fuel line 20, etc.

[0141] (11) The floating body 1 according to the eleventh embodiment is any one of the floating bodies 1 from (1) to (9), comprising a dilution tank 300 in which the absorbent liquid is stored, and an introduction line 301 for introducing the ammonia into the dilution tank 300, wherein the ammonia introduction section 61,261 introduces the gas phase gas in the dilution tank into the reactor 63,163. This makes it possible to absorb ammonia into the absorbent solution in the dilution tank 300. In addition, it is possible to absorb the ammonia released into the gas phase of the dilution tank 300 into the absorbent solution by the reactor 63.

[0142] (12) The floating body 1 according to the twelfth embodiment is any one of the floating bodies 1 from (1) to (9), comprising a dilution tank 300 in which the absorbent liquid is stored, and an introduction line 301 for introducing the ammonia into the dilution tank 300, wherein the introduction line 301 introduces the gas phase gas in the recovery tanks 65,165 into the liquid phase of the dilution tank 300. This makes it possible to absorb ammonia contained in the gas phase of recovery tanks 65 and 165 into the absorbent solution in dilution tank 300.

[0143] (13) The floating body 1 according to the 13th embodiment is any one of the floating body 1 from (1) to (9), comprising: a combustion device 8 that burns fuel and discharges exhaust gas; a denitrification device 103 that denitrifies the exhaust gas discharged from the combustion device 8; a denitrification ammonia solution tank 104 that stores a denitrification ammonia solution used as a reducing agent for the denitrification device 103; and an ammonia absorption liquid supply line 180 that supplies the ammonia absorption liquid W stored in the recovery tanks 65, 165 to the denitrification ammonia solution tank 104. This allows the ammonia absorbent liquid W recovered in the recovery tanks 65 and 165 to be supplied to the denitrification ammonia solution tank 104 via the ammonia absorbent liquid supply line 180. Therefore, the denitrification ammonia solution can be generated in the denitrification ammonia solution tank 104 using the ammonia absorbent liquid W, and this denitrification ammonia solution in the denitrification ammonia solution tank 104 can be used as a reducing agent in the denitrification device 103. This makes effective use of the ammonia absorbent liquid W stored in the recovery tanks 65 and 165.

[0144] (14) The floating body 1 according to the 14th embodiment is the floating body 1 described in (13), comprising an ammonia tank 10 for storing liquefied ammonia and a liquefied ammonia supply line 106 for supplying the liquefied ammonia stored in the ammonia tank 10 to the denitrification ammonia solution tank 104. This allows for the production of a denitrification ammonia solution with a higher ammonia concentration than the ammonia absorbent W by mixing the ammonia absorbent W supplied to the denitrification ammonia solution tank 104 with ammonia stored in the ammonia tank 10, which has a higher ammonia concentration than the ammonia absorbent W.

[0145] (15) The floating body 1 according to the 15th embodiment is any one of the floating body 1 from (1) to (9), wherein the floating body body 2 is provided with a compartment 30 that houses ammonia-related equipment and allows outside air to be introduced, and the ammonia introduction section 61,261 introduces the gas in the compartment 30 into the reactor 63,163. This allows ammonia leaked within compartment 30 of the floating body 2 to be absorbed by the absorbent liquid, and then removed by the reactors 63 and 163. Furthermore, by releasing the ammonia absorbed by the absorbent liquid into the gas phase in the recovery tanks 65 and 165 and opening it to the atmosphere, the ammonia absorbent liquid W can be detoxified. [Explanation of Symbols]

[0146] 1…Floating structure 2…Floating structure body 4…Superstructure 5A, 5B…Side 6…Bottom 7…Upper deck 8…Combustion equipment 10…Ammonia tank 20…Piping system 21…Supply pipe 22…Return pipe 23, 24…On / off valve 25…Residual ammonia supply line 26…Residual ammonia supply line body 27…Ammonia temporary storage unit 28…On / off valve 30…Compartment 31…Air supply equipment 32…Exhaust equipment 33…Air supply damper 34…Air supply duct 35…Exhaust damper 36…Exhaust duct 37…Line body 38…Inlet fan 39…Inlet fan inlet damper 40…Ammonia buffer tank 41…Inlet damper 50…Inert gas supply device 51…Inert gas supply unit 52…Inert gas supply pipe 53…Inert gas supply valve 60,160,260,360…Ammonia decontamination unit 61,261,361…Ammonia introduction unit 62…Absorbent liquid introduction unit 63,163…Reactor 63t…Reaction acceleration unit 64,164…Ammonia absorbent liquid discharge line 65,165…Recovery tank 66,166…Gas phase ammonia concentration adjustment unit 67,167…First dilution gas supply line 68…First blower 69…First valve 70,170,370…Atmospheric release line 71…Release line body 72…Atmospheric release valve 73…Discharge gas dilution unit 74,174…Second dilution gas supply line 75…Second blower 76…Second valve 77…Inert gas discharge line 80,180…Ammonia absorbent solution supply line 81…Third blower 82…Absorbent solution temperature adjustment unit 83…Absorbent solution pH adjustment device 84…Acid gas introduction device 86…Line body 87…Introduction blower 88…Introduction valve 90…First pressure sensor 91…Inert gas discharge valve 92…Absorbent solution introduction valve 93…Recirculation line 94…Recirculation line body 95…First recirculation valve 96…Second recirculation valve 97…Recirculation pump 98…Discharge line body 99…Discharge valve 100…pH detection unit 101…Liquid level detection unit 102…Exhaust pipe 103…Denitrification device 104…Ammonia solution tank for denitrification 105…Ammonia solution supply line for denitrification 106…Liquefied ammonia supply line 106A…First line 106B…Second line 107…Circulation piping 108…Agitation pump 109…Concentration meter 110...Ammonia solution pump for denitrification 111...Ammonia absorption liquid supply pump 112...Flow control valve 113...Supply pump 168...First compressor 300...Dilution tank 301...Inlet line 302...Diffuser pipe 305...Dilution air inlet 306...First dilution gas supply line 307...First blower 308...First valve 309...Bypass line 310...Bypass valve 311,312...Valves R...Flow path

Claims

1. The floating body itself, The floating body includes an ammonia introduction section into which ammonia can be introduced, An absorbent liquid introduction section into which an absorbent liquid capable of absorbing ammonia can be introduced, A reactor that generates an ammonia absorbent by reacting the ammonia from the ammonia introduction section with the absorbent from the absorbent introduction section, The ammonia absorbent liquid produced in the reactor and discharged from the reactor is introduced into a recovery tank capable of storing the ammonia absorbent liquid, A floating body equipped with [the following features].

2. The recovery tank is equipped with a gas phase ammonia concentration adjustment unit for adjusting the ammonia concentration in the gas phase. The floating body according to claim 1.

3. The reactor is equipped with a gas discharge line for discharging gas from within the reactor. The floating body according to claim 1 or 2.

4. The reactor is equipped with a first pressure adjustment unit capable of adjusting the pressure. A floating body according to any one of claims 1 to 3.

5. The recovery tank is equipped with a second pressure adjustment unit capable of adjusting the gas phase pressure. A floating body according to any one of claims 1 to 4.

6. The floating body according to any one of claims 1 to 5, further comprising a temperature control unit capable of adjusting the temperature of the ammonia absorbent liquid stored in the recovery tank.

7. A recirculation line returns the ammonia absorbent solution produced by the reactor to the absorbent solution introduction section, A switching unit that switches the supply destination of the ammonia absorbent produced by the reactor to the absorbent introduction unit and the recovery tank, Equipped with A floating body according to any one of claims 1 to 6.

8. A state amount detection unit for detecting the state amount of the ammonia absorbent liquid produced by the reactor, The system includes a switching control unit that performs switching control of the switching unit based on the detection results of the state quantity detection unit. The floating body according to claim 7.

9. The recovery tank is equipped with an ammonia absorbent liquid supply line that supplies the ammonia absorbent liquid stored in the recovery tank to the outside of the recovery tank. A floating body according to any one of claims 1 to 8.

10. The combustion device using ammonia as fuel, an ammonia tank for storing the ammonia used as fuel, A fuel line that supplies ammonia from the ammonia tank to the combustion device, and an inert gas supply device that supplies inert gas into the fuel line, A residual ammonia supply line for discharging the ammonia in the fuel line that has been pressed by the inert gas, Equipped with, The ammonia introduction section is, The ammonia discharged through the residual ammonia supply line is introduced into the reactor. A floating body according to any one of claims 1 to 9.

11. A dilution tank in which the absorbent liquid is stored, The system includes an introduction line for introducing the ammonia into the dilution tank, The ammonia introduction unit introduces the gas phase gas in the dilution tank into the reactor. A floating body according to any one of claims 1 to 9.

12. A dilution tank in which the absorbent liquid is stored, The system includes an introduction line for introducing the ammonia into the dilution tank, The introduction line introduces the gas phase in the recovery tank into the liquid phase of the dilution tank. A floating body according to any one of claims 1 to 9.

13. A combustion device that emits exhaust gas by burning fuel, A denitrification device that performs denitrification treatment on the exhaust gas discharged from the combustion device, A denitrification ammonia solution tank for storing the denitrification ammonia solution used as a reducing agent in the aforementioned denitrification apparatus, An ammonia absorbent liquid supply line supplies the ammonia absorbent liquid stored in the recovery tank to the ammonia denitrification solution tank, Equipped with A floating body according to any one of claims 1 to 9.

14. an ammonia tank for storing liquefied ammonia, The system includes a liquefied ammonia supply line that supplies the liquefied ammonia stored in the ammonia tank to the denitrification ammonia solution tank. The floating body according to claim 13.

15. The floating body is equipped with a compartment that houses ammonia-related equipment and allows outside air to be introduced. The ammonia introduction unit introduces the gas in the compartment into the reactor. A floating body according to any one of claims 1 to 9.

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