Ammonia treatment system, floating body

Abstract

To remove ammonia from water containing ammonia sufficiently.SOLUTION: An ammonia treatment system includes: an absorption tower having a casing, a gas introduction part for introducing ammonia gas containing ammonia into the casing, a water spray part which sprays water from an upper part in the casing to absorb the ammonia and thereby generate ammonia water, and a drain part which drains the ammonia water from a lower part of the casing; an ammonia component removal part which is provided outside the absorption tower and removes an ammonia component contained in the ammonia water to generate treatment water; an ammonia water introduction line which introduces the ammonia water drained from the drain part into the ammonia component removal part; and a first treatment water supply line which supplies the treatment water generated by the ammonia component removal part to the water spray part.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to an ammonia treatment system and a floating body.

Background Art

[0002] In a room that houses devices, equipment, etc. for handling ammonia, there is a possibility of ammonia leakage. Further, in the devices, equipment, etc. for handling the above ammonia, purging may be performed with an inert gas that does not react with ammonia, and the ammonia remaining together with the inert gas may be discharged. Since ammonia can act on the mucous membranes of humans and cause damage, the gas containing ammonia generated by the above leakage, purging, etc. cannot be directly released into the atmosphere. Patent Document 1 discloses an ammonia gas detoxification system that detoxifies ammonia gas leaked from a refrigeration unit before releasing it into the atmosphere. In this detoxification system, a gas containing ammonia is guided into a closed space such as a scrubber or a cooling tower, and is brought into sufficient contact with water to adsorb the ammonia component onto the water. Next, carbon dioxide gas is supplied to the water that has absorbed the ammonia component, and after reducing the ammonia concentration by neutralizing the ammonia component, this water is brought into contact with the untreated gas again.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the configuration described in Patent Document 1, carbon dioxide is supplied to a closed space such as a scrubber or cooling tower in order to reduce the ammonia concentration in the water that has adsorbed ammonia components. In scrubbers and cooling towers, untreated gas containing ammonia is sequentially fed in during the treatment of gas containing ammonia. As a result, water that has adsorbed ammonia is also continuously generated sequentially. Therefore, even if carbon dioxide is supplied to a closed space such as a scrubber or cooling tower, it is not guaranteed that the ammonia concentration in the continuously generated water containing ammonia can be sufficiently reduced.

[0005] This disclosure was made to solve the above-mentioned problems and aims to provide an ammonia treatment system and a float capable of sufficiently removing ammonia from water containing ammonia. [Means for solving the problem]

[0006] To solve the above problems, the ammonia treatment system according to this disclosure comprises an absorption tower, an ammonia component removal section, an ammonia water introduction line, and a first treated water supply line. Water intake section, The absorption tower comprises a casing, a gas inlet, a water spraying section, and a drainage section. The gas inlet introduces ammonia gas containing ammonia into the casing. The water spraying section absorbs the ammonia by spraying water from the top of the casing to produce ammonia water. The drainage section discharges the ammonia water from the bottom of the casing. The ammonia component removal section is located outside the absorption tower. The ammonia component removal section removes the ammonia components contained in the ammonia water to produce treated water. The ammonia water introduction line introduces the ammonia water discharged from the drainage section to the ammonia component removal section. The first treated water supply line supplies the treated water produced by the ammonia component removal section to the water spraying section. The water intake section takes in seawater. The ammonia component removal unit comprises an electrolysis unit that generates a seawater electrolyte containing sodium hypochlorite by electrolyzing the seawater taken from the water intake unit, and a denitrification reaction unit that reacts the ammonia water introduced by the ammonia water introduction line with the seawater electrolyte generated in the electrolysis unit.

[0007] The floating body according to this disclosure comprises a floating body body and an ammonia treatment system as described above. The ammonia treatment system is provided in the floating body body. [Effects of the Invention]

[0008] According to the ammonia treatment system and float of this disclosure, ammonia can be sufficiently removed from water containing ammonia. [Brief explanation of the drawing]

[0009] [Figure 1] This is a side view of a floating body equipped with an ammonia treatment system according to an embodiment of the present disclosure. [Figure 2] This figure shows the configuration of the ammonia treatment system according to the first embodiment of this disclosure. [Figure 3] This figure shows the configuration of the ammonia treatment system according to the second embodiment of this disclosure. [Modes for carrying out the invention]

[0010] The ammonia treatment system and float according to the embodiments of this disclosure will be described below with reference to Figures 1 to 3. <First Embodiment> (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, and an ammonia treatment system 10. In this first embodiment, the floating body 1 is described as a vessel capable of navigation by a main engine, etc., as an example. The type of vessel of 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. In this first embodiment, the case where the floating body 1 is a vessel is described, but the floating body 1 is not limited to a vessel and may be an FSU (Floating Storage Unit), FSRU (Floating Storage and Regasification Unit), etc., that is not capable of navigation by a main engine, etc.

[0011] The floating body 2 is designed to float on seawater. The floating body 2 has a pair of side panels 5A and 5B that form its outer shell, and a bottom 6. The side panels 5A and 5B are each equipped with a pair of side plates that form the left and right sides, respectively. The bottom 6 is equipped with a bottom plate that connects these side panels 5A and 5B. Due to these pair of side panels 5A and 5B and the bottom 6, the outer shell of the floating body 2 has a U-shape in a cross section perpendicular to the bow-stern direction FA.

[0012] The floating body 2 further includes an upper deck 7, which is a full-length deck located at the uppermost level. The superstructure 4 is formed on this upper deck 7. Living quarters and the like are provided within the superstructure 4. In this first embodiment of the floating body 1, for example, a cargo space (not shown) for loading cargo is provided on the bow 2a side of the ship in the forward-stern direction FA from the superstructure 4.

[0013] (Overall configuration of the ammonia treatment system) The ammonia treatment system 10 is provided in the floating body 2. In this first embodiment, the ammonia treatment system 10 is provided inside the floating body 2. The ammonia treatment system 10 is not limited to being provided inside the floating body 2, but may be provided in other locations, for example, on the upper deck 7 of the floating body 2.

[0014] The ammonia treatment system 10 removes ammonia by purging ammonia-containing gases that have leaked from ammonia handling equipment, as well as ammonia-containing gases that do not react with ammonia, and other ammonia-containing gases discharged along with the inert gas.

[0015] Figure 2 shows the configuration of an ammonia treatment system according to the first embodiment of this disclosure. As shown in Figure 2, the ammonia treatment system 10 of this first embodiment comprises at least an absorption tower 20, a dilution tank 30, an ammonia water storage tank 40, an ammonia component removal unit 50, an ammonia water introduction line 90, a treated water supply line 100, and an external water introduction unit 80.

[0016] The absorption tower 20 includes a casing 21, a gas introduction section 22, a water spray section 23, a gas discharge section 24, and a drainage section 25.

[0017] The casing 21 is formed in a cylindrical shape extending in the vertical direction. At the lower part of the internal space 21s (inside the casing) of the casing 21, ammonia water that has absorbed the ammonia component contained in the ammonia gas G can be stored.

[0018] The gas introduction section 22 is capable of introducing ammonia gas G containing at least an ammonia component into the casing 21. The gas introduction section 22 includes a gas supply line 221 and an on-off valve 222.

[0019] One end of the gas supply line 221 is connected to a dilution tank 30 described later. The other end of the gas supply line 221 is connected to the casing 21. One end of the gas supply line 221 opens to the gas phase of the dilution tank 30, and the other end of the gas supply line 221 opens at a position above the liquid level of the ammonia water in the internal space 21s of the casing 21.

[0020] The on-off valve 222 opens and closes the flow path in the gas supply line 221. By opening and closing the on-off valve 222, the introduction of ammonia gas G into the casing 21 through the gas supply line 221 is interrupted. In this first embodiment, the gas supply line 221 introduces ammonia gas G diluted by the dilution tank 30 and having a reduced ammonia concentration into the internal space 21s of the casing 21. The ammonia gas G introduced from the gas supply line 221 of the gas introduction section 22 into the internal space 21s of the casing 21 rises from the lower part to the upper part of the internal space 21s of the casing 21.

[0021] The water spraying unit 23 absorbs ammonia contained in ammonia gas G by spraying water from the top of the casing 21, thereby generating ammonia water. The water spraying unit 23 is equipped with a nozzle 232. The nozzle 232 is connected to the first treated water supply line 60, which will be described later. The nozzle 232 sprays water supplied from the first treated water supply line 60 from the top of the internal space 21s of the casing 21. The nozzle 232 sprays water into the internal space 21s of the casing 21 by jetting, dripping, spraying, etc. Due to its own weight, the sprayed water moves downward through the internal space 21s of the casing 21. As the sprayed water moves through the internal space 21s of the casing 21, it comes into contact with ammonia gas G rising from the bottom to the top of the internal space 21s of the casing 21, and absorbs the ammonia components contained in the ammonia gas G. This generates ammonia water.

[0022] The gas discharge section 24 is capable of releasing gas from the internal space 21s from the top of the casing 21. One end of the gas discharge line 241 is connected to the gas discharge section 24. Examples of connections for the other end (not shown) of the gas discharge line 241 include a funnel and a vent post. The gas discharge section 24 releases the gas, from which the ammonia component has been removed by the water spraying, to the atmosphere, for example.

[0023] The drainage section 25 discharges ammonia water from the bottom of the casing 21 to the outside of the casing 21. The ammonia water introduction line 90, which will be described later, is connected to the drainage section 25.

[0024] The dilution tank 30 is capable of storing absorbent water that absorbs ammonia. The dilution tank 30 pre-dilutes the ammonia gas G that will be introduced into the gas inlet 22 of the absorption tower 20. The dilution tank 30 introduces ammonia gas G containing ammonia into the absorbent water to reduce the ammonia concentration of the ammonia gas G.

[0025] An ammonia introduction line 31 is connected to the dilution tank 30. The ammonia introduction line 31 introduces ammonia gas G, which is sent out along with the inert gas when purged with the activated gas mentioned above, into the dilution tank 30.

[0026] A mixing section 32 is provided in the middle of the ammonia introduction line 31. The mixing section 32 mixes the ammonia from the ammonia introduction line 31 with absorbent water stored in the dilution tank 30 that is capable of absorbing ammonia. In this embodiment, the mixing section 32 includes a mixer 321, an absorbent water supply line 322, and an absorbent water circulation pump 323. The mixer 321 mixes the ammonia gas G with the absorbent water before it is introduced into the dilution tank 30. For example, an ejector or a microreactor can be used as the mixer 321. Mixing by the mixer 321 makes it easier for the ammonia gas G to be absorbed by the absorbent water. The absorbent water supply line 322 supplies the absorbent water from the dilution tank 30 to the mixer 321. The absorbent water circulation pump 323 sends the absorbent water from the absorbent water supply line 322 towards the mixer 321. The mixed fluid mixed by the mixing section 32 is introduced into the dilution tank 30.

[0027] At the outlet end of the ammonia introduction line 31, a diffuser pipe 315 is provided to release the gas contained in the mixed fluid as small bubbles. The diffuser pipe 315 extends along the bottom of the dilution tank 30 within the liquid phase of the dilution tank 30, so that the bubbles contained in the mixed fluid released from the diffuser pipe 315 spread throughout the absorbent water in the dilution tank 30. As a result, the ammonia gas G contained in the mixed fluid comes into contact with the absorbent water in the dilution tank 30, making it easier for the ammonia components contained in the ammonia gas G to be absorbed into the absorbent water in the dilution tank 30.

[0028] A dilution gas introduction line 33 is connected to the dilution tank 30. The dilution gas introduction line 33 is capable of introducing a dilution gas into the gas phase of the dilution tank 30 to reduce the ammonia concentration in the gas phase. In other words, the dilution gas introduction line 33 is capable of adjusting the concentration of ammonia gas in the gas phase of the dilution tank 30. Outside air can be used as an example of the dilution gas. The dilution gas introduction line 33 is equipped with a dilution fan 33f that can adjust the flow rate of the dilution gas supplied to the gas phase of the dilution tank 30.

[0029] One end of an absorption water introduction line 35, which introduces absorption water from the outside, is connected to the dilution tank 30. The other end of the absorption water introduction line 35 is connected to a clean water introduction line 36 and a second treated water supply line 70, which will be described later. The clean water introduction line 36 supplies clean water stored in the clean water tank of the floating body 2 as absorption water, for example.

[0030] A gas supply line 221 is connected to the dilution tank 30. The gas supply line 221 draws the gas (diluted ammonia gas G) from the gas phase of the dilution tank 30 out of the dilution tank 30 and supplies it into the casing 21. The gas supply line 221 is equipped with a check valve 221v to prevent backflow of ammonia gas G from the casing 21 side. The gas inlet 22 introduces the ammonia gas G diluted in the dilution tank 30 into the casing 21.

[0031] A diluted absorbent water discharge line 38 is connected to the dilution tank 30. The diluted absorbent water discharge line 38 is capable of discharging absorbent water from the dilution tank 30. One end of the diluted absorbent water discharge line 38 is connected to the bottom of the dilution tank 30. The other end of the diluted absorbent water discharge line 38 is connected to the ammonia water storage tank 40. The diluted absorbent water discharge line 38 is capable of discharging absorbent water (ammonia water) that has absorbed ammonia in the dilution tank 30 to the ammonia water storage tank 40.

[0032] The ammonia water storage tank 40 is capable of storing ammonia water discharged from the drainage section 25 through the ammonia water introduction line 90 and absorbed water discharged from the dilution tank 30 through the dilution absorbed water discharge line 38.

[0033] Furthermore, one end of the gas discharge line 41 is connected to the ammonia water storage tank 40. The other end of the gas discharge line 41 is connected to the middle of the gas supply line 221. The gas discharge line 41 is capable of supplying ammonia gas separated from the ammonia water (ammonia water, absorbed water) in the ammonia water storage tank 40 to the gas supply line 221. An on-off valve 42 is provided in the middle of the gas discharge line 41, and by opening and closing the on-off valve 42, the supply of ammonia gas from the gas phase of the ammonia water storage tank 40 to the gas supply line 221 can be intermittently controlled.

[0034] The ammonia component removal unit 50 is located outside the absorption tower 20. The ammonia component removal unit 50 removes ammonia components contained in the ammonia water to produce treated water. The ammonia component removal unit 50 removes ammonia components contained in the ammonia water introduced from the ammonia water introduction line 90.

[0035] The ammonia water introduction line 90 introduces the ammonia water discharged from the drainage section 25 to the ammonia component removal section 50. The ammonia water introduction line 90 comprises an introduction line body 91 and the ammonia water storage tank 40 located in the middle of the introduction line body 91. The introduction line body 91 connects the drainage section 25 and the ammonia component removal section 50. The introduction line body 91 has an upstream introduction line section 911 on the absorption tower 20 side relative to the ammonia water storage tank 40, and a downstream introduction line section 912 on the ammonia component removal section 50 side relative to the ammonia water storage tank 40. The upstream introduction line section 911 is located between the drainage section 25 and the ammonia water storage tank 40. The downstream introduction line section 912 is located between the ammonia water storage tank 40 and the ammonia component removal section 50.

[0036] The ammonia component removal unit 50 removes ammonia components from the ammonia water using sodium hypochlorite obtained by electrolyzing seawater. For this purpose, the ammonia treatment system 10 is equipped with a water intake unit 58. The water intake unit 58 takes in seawater from the sea surrounding the floating body 2.

[0037] The ammonia component removal unit 50 comprises an electrolysis unit 51 and a denitrification reaction unit 53. The electrolysis unit 51 generates a seawater electrolyte containing sodium hypochlorite by electrolyzing seawater taken in from the water intake unit 58. Specifically, the electrolysis unit 51 places a positive electrode and a negative electrode (not shown) in the introduced seawater and electrolyzes the seawater by applying a voltage between these positive and negative electrodes. This electrolysis generates sodium hypochlorite from the seawater.

[0038] The denitrification reaction unit 53 reacts a mixture of ammonia water and seawater electrolyte produced in the electrolysis unit 51. The denitrification reaction unit 53 mixes and reacts the seawater electrolyte produced by electrolysis with ammonia water introduced from the ammonia water storage tank 40. More specifically, as shown in equation (1), the denitrification reaction unit 53 reacts ammonia (2NH3) contained in ammonia water with sodium hypochlorite (3NaClO) in the seawater electrolyte in an acidic environment to decompose it into nitrogen (N2), sodium chloride (3NaCl), and water (3H2O). 2NH3+3NaClO⇒N2+3NaCl+3H2O...(1)

[0039] The nitrogen produced by the denitrification reaction in the denitrification reaction section 53 is released into the atmosphere, for example, via a funnel 8 extending from the upper deck 7. Meanwhile, the sodium chloride and water produced by the denitrification reaction are discharged as treated water to a discharge section 59 connected to the ammonia component removal section 50. The discharge section 59 is equipped with a discharge valve 59v, and by opening the discharge valve 59v, the treated water is discharged into the seawater surrounding the floating body 2.

[0040] The treated water supply line 100 supplies treated water generated by the ammonia component removal unit 50 to the absorption tower 20 and the dilution tank 30. The treated water supply line 100 comprises a main supply line 101, a first treated water supply line 60, and a second treated water supply line 70. One end 101a of the main supply line 101 is connected to the ammonia component removal unit 50. One end 60a of the first treated water supply line 60 and one end 70a of the second treated water supply line 70 are connected to the other end 101b of the main supply line 101. In other words, the treated water supply line 100 branches from the main supply line 101 into the first treated water supply line 60 and the second treated water supply line 70. A pump 102 is provided in the middle of the main supply line 101 to send the treated water generated by the ammonia component removal unit 50 to the first treated water supply line 60 and the second treated water supply line 70. The discharge section 59 described above is located downstream of the pump 102 and is branched off from the main supply line 101.

[0041] The other end 60b of the first treated water supply line 60 is connected to the nozzle 232 of the water spraying unit 23. The first treated water supply line 60 supplies treated water, which is generated by the ammonia component removal unit 50 and sent through the main supply line 101, to the nozzle 232 of the water spraying unit 23. A first on-off valve 61 is provided in the middle of the first treated water supply line 60. By opening and closing the first on-off valve 61, the supply of treated water from the main supply line 101 to the water spraying unit 23 through the first treated water supply line 60 can be intermittently controlled.

[0042] The other end 70b of the second treated water supply line 70 is connected to the absorption water introduction line 35. The second treated water supply line 70 supplies the treated water generated by the ammonia component removal unit 50 and sent through the main supply line 101 as absorption water to the dilution tank 30 via the absorption water introduction line 35. A second on-off valve 71 is provided in the middle of the second treated water supply line 70. By opening and closing the second on-off valve 71, the supply of treated water from the main supply line 101 to the dilution tank 30 through the second treated water supply line 70 can be interrupted.

[0043] In this treated water supply line 100, by opening the first on-off valve 61, the treated water generated by the ammonia component removal unit 50 can be supplied to the watering unit 23 through the main supply line 101 and the first treated water supply line 60. In addition, by opening the second on-off valve 71 in the treated water supply line 100, the treated water generated by the ammonia component removal unit 50 can be supplied to the dilution tank 30 as absorbent water through the main supply line 101 and the second treated water supply line 70.

[0044] The external water inlet 80 is capable of supplying water to the first treated water supply line 60 from the outside. The external water inlet 80 includes an external water inlet line 81 and a third on / off valve 82. The external water introduction line 81 is connected to the first treated water supply line 60 in the middle. Specifically, the external water introduction line 81 is connected to the first treated water supply line 60 between the first on-off valve 61 and the water spraying unit 23. The external water introduction line 81 is supplied with water (e.g., fresh water) stored in a water tank (not shown) provided inside the floating body 2, or water (e.g., seawater) taken in from outside the floating body. The third on-off valve 82 is provided in the middle of the external water introduction line 81. By opening and closing the third on-off valve 82, the introduction of water from the outside through the external water introduction line 81 to the first treated water supply line 60 can be intermittently controlled.

[0045] The ammonia treatment system 10 is equipped with a water switching unit 85. The water switching unit 85 can switch the water supplied to the watering unit 23 between treated water supplied by the first treated water supply line 60 and water introduced by the external water introduction unit 80. In this embodiment, the water switching unit 85 is composed of the first on-off valve 61 and the third on-off valve 82 described above. In the water switching unit 85, treated water can be supplied to the watering unit 23 from the first treated water supply line 60 by opening the first on-off valve 61 and closing the third on-off valve 82. In addition, in the water switching unit 85, water supplied from the outside by the external water introduction line 81 can be supplied to the watering unit 23 by closing the first on-off valve 61 and opening the third on-off valve 82.

[0046] (Effects and Benefits) In the first embodiment described above, ammonia gas G is introduced into the casing 21 from the gas inlet 22, and water is sprayed from the top of the casing 21 by the water spraying unit 23, thereby absorbing the ammonia contained in the ammonia water. The ammonia water generated by the absorption of ammonia is discharged from the bottom of the casing 21 by the drainage unit 25. The ammonia water discharged from the drainage unit 25 is introduced by the ammonia water introduction line 90 to the ammonia component removal unit 50 located outside the absorption tower 20. In the ammonia component removal unit, the ammonia components contained in the introduced ammonia water are removed to produce treated water. The treated water produced by the ammonia component removal unit 50 is supplied to the water spraying unit 23 of the absorption tower 20 by the first treated water supply line 60. In this way, by removing the ammonia component contained in the ammonia water in the ammonia component removal section 50 located outside the absorption tower 20, it becomes possible to sufficiently remove ammonia from water containing ammonia. Furthermore, by using the treated water from which ammonia components have been removed for spraying in the absorption tower 20, the amount of water introduced from the outside can be reduced, allowing the ammonia treatment system 10 to be operated efficiently.

[0047] Furthermore, in the first embodiment described above, the ammonia water discharged from the drainage section 25 of the absorption tower 20 is stored in the ammonia water storage tank 40 through the introduction line body 91. Subsequently, the ammonia water stored in the ammonia water storage tank 40 is introduced by the ammonia water introduction line 90 to the ammonia component removal section 50 located outside the absorption tower 20. In this way, the ammonia water discharged from the drainage section 25 of the absorption tower 20 can be stored to some extent in the ammonia water storage tank 40 before being supplied to the ammonia component removal section 50. Therefore, it becomes unnecessary to operate the ammonia component removal section 50 continuously, thus saving energy.

[0048] Furthermore, in the first embodiment described above, by introducing ammonia gas G into the absorbent water in the dilution tank 30, the ammonia concentration of the diluted ammonia gas G is introduced into the casing 21 of the absorption tower 20, thereby allowing the absorption tower 20 to absorb ammonia into the water more efficiently. In addition, in the dilution tank 30, the treated water generated by the ammonia component removal unit 50 is supplied as absorbent water through the second treated water supply line 70. This makes effective use of the treated water generated by the ammonia component removal unit 50 and reduces the amount of water introduced from the outside for use as absorbent water in the dilution tank 30.

[0049] Furthermore, in the first embodiment described above, seawater taken from the intake unit 58 is subjected to electrolysis in the electrolysis unit 51 to produce a seawater electrolyte containing sodium hypochlorite, and in the ammonia component removal unit 50, a denitrification reaction occurs by reacting a mixture of ammonia water and the produced seawater electrolyte, thereby removing ammonia from the ammonia water. In this way, by using seawater for ammonia removal, especially when such an ammonia treatment system is installed on the floating body 1, it is possible to easily obtain the sodium hypochlorite necessary for ammonia treatment by taking seawater from the sea on which the floating body 1 floats.

[0050] Furthermore, in the first embodiment described above, water introduced from the outside through the external water introduction unit 80 can be used as the water supplied to the watering unit 23. This increases the options for the water used for watering by the watering unit 23.

[0051] <Second Embodiment> Next, an ammonia treatment system according to the second embodiment of this disclosure will be described. This second embodiment differs from the first embodiment only in the configuration in which a treated water storage tank 200 is included. Therefore, using Figure 1, the same parts as in the first embodiment will be denoted by the same reference numerals and redundant explanations will be omitted.

[0052] (Overall configuration of the ammonia treatment system) Figure 3 shows the configuration of an ammonia treatment system according to the second embodiment of this disclosure. As shown in Figure 3, the ammonia treatment system 10B of this second embodiment includes at least an absorption tower 20, a dilution tank 30, an ammonia water storage tank 40, an ammonia component removal unit 50, an ammonia water introduction line 90, a treated water supply line 100B, and a treated water storage tank 200. This ammonia treatment system 10B does not include the external water introduction unit 80 shown in the first embodiment.

[0053] The treated water supply line 100B supplies treated water generated by the ammonia component removal unit 50 to the absorption tower 20 and the dilution tank 30. The treated water supply line 100B comprises a main supply line 101B, a first treated water supply line 60, and a second treated water supply line 70. One end 101c of the main supply line 101B is connected to the ammonia component removal unit 50. The other end 101d of the main supply line 101B is connected to one end 60a of the first treated water supply line 60 and one end 70a of the second treated water supply line 70.

[0054] The treated water storage tank 200 is located in the middle of the main supply line 101B. The treated water storage tank 200 stores the treated water generated in the ammonia component removal unit 50. The treated water storage tank 200 functions as a so-called buffer tank capable of temporarily storing treated water. Downstream of the treated water storage tank 200, the main supply line 101B is equipped with a pump 103 that sends the treated water stored in the treated water storage tank 200 to the first treated water supply line 60 and the second treated water supply line 70. The treated water storage tank 200 exemplified in this second embodiment can be injected with fresh water or seawater from inside or outside the floating body 1. With such an injection-capable configuration, for example, if ammonia remains in the treated water stored in the treated water storage tank 200, it is possible to reduce the ammonia concentration of the treated water.

[0055] The first treated water supply line 60 supplies treated water stored in the treated water storage tank 200 to the water spraying unit 23. Specifically, the first treated water supply line 60 supplies treated water sent from the treated water storage tank 200 via the main supply line 101B by the pump 103 to the water spraying unit 23. The second treated water supply line 70 supplies the same treated water stored in the treated water storage tank 200 to the dilution tank 30. Specifically, the second treated water supply line 70 supplies treated water sent from the treated water storage tank 200 via the main supply line 101B by the pump 103 to the dilution tank 30.

[0056] (Effects and Benefits) In the ammonia treatment system 10B of the second embodiment described above, similar to the first embodiment, the ammonia component contained in the ammonia water is removed by the ammonia component removal unit 50 provided outside the absorption tower 20, thereby enabling sufficient removal of ammonia from water containing ammonia.

[0057] Furthermore, in the second embodiment described above, the treated water generated in the ammonia component removal unit 50 is stored in the treated water storage tank 200 and then supplied to the water spraying unit 23 through the first treated water supply line 60. This minimizes the impact of the treated water generation status in the ammonia component removal unit 50 and allows for a stable supply of treated water from the treated water storage tank 200 to the water spraying unit 23.

[0058] (Other embodiments) Although embodiments of this disclosure have been described in detail above with reference to the drawings, the specific configurations are not limited to each embodiment and may include design changes, etc., that do not depart from the gist of this disclosure. For example, in the above embodiment, the treated water generated in the ammonia component removal unit 50 is supplied to the water spraying unit 23 and the dilution tank 30, but it is not limited to this, and for example, the treated water may be supplied to other targets. Furthermore, if sodium hypochlorite remains in the treated water generated in the ammonia component removal unit 50, the treated water generated in the ammonia component removal unit 50 may be used to prevent marine organisms from adhering to the floating body 1. Furthermore, the ammonia component removal unit 50 is not limited to having a denitrification reaction unit 53, but may use other types as appropriate, as long as it can remove the ammonia component contained in the ammonia water and produce treated water.

[0059] <Note> The ammonia treatment systems 10, 10B and the float 1 described in each embodiment can be understood, for example, as follows.

[0060] (1) An ammonia treatment system 10, 10B according to the first embodiment comprises an absorption tower 20 having a casing 21, a gas introduction section 22 for introducing ammonia gas G containing ammonia into the casing 21, a water spraying section 23 for absorbing the ammonia and generating ammonia water by spraying water from the upper part of the casing 21, and a drainage section 25 for discharging the ammonia water from the lower part of the casing 21; an ammonia component removal section 50 provided outside the absorption tower 20 for removing ammonia components contained in the ammonia water and generating treated water; an ammonia water introduction line 90 for introducing the ammonia water discharged from the drainage section 25 into the ammonia component removal section 50; and a first treated water supply line 60 for supplying the treated water generated by the ammonia component removal section 50 to the water spraying section 23.

[0061] According to this ammonia treatment system 10,10B, in the absorption tower 20, ammonia gas G introduced into the casing 21 from the gas inlet 22 is sprayed with water from the top of the casing 21 by the water spraying unit 23, thereby absorbing the ammonia contained in the ammonia gas G into the water. The ammonia water produced by the absorption of ammonia is discharged from the bottom of the casing 21 by the drainage unit 25. The ammonia water discharged from the drainage unit 25 is introduced by the ammonia water introduction line 90 to the ammonia component removal unit 50 located outside the absorption tower 20. In the ammonia component removal unit, the ammonia components contained in the introduced ammonia water are removed to produce treated water. The treated water produced by the ammonia component removal unit 50 is supplied to the water spraying unit 23 of the absorption tower 20 by the first treated water supply line 60. In this way, by removing the ammonia components contained in the ammonia water in the ammonia component removal section 50 located outside the absorption tower 20, it becomes possible to sufficiently remove ammonia from water containing ammonia. Furthermore, by using the treated water from which ammonia components have been removed for spraying in the absorption tower 20, the amount of water introduced from the outside can be reduced, allowing for efficient operation of the ammonia treatment systems 10 and 10B.

[0062] (2) The ammonia treatment system 10B according to the second embodiment is the ammonia treatment system 10B of (1), further comprising a treated water storage tank 200 for storing the treated water generated in the ammonia component removal unit 50, and the first treated water supply line 60 supplies the treated water stored in the treated water storage tank 200 to the watering unit 23.

[0063] As a result, the treated water generated in the ammonia component removal unit 50 is stored in the treated water storage tank 200 and then supplied to the water spraying unit 23 through the first treated water supply line 60. This minimizes the impact of the treated water generation conditions in the ammonia component removal unit 50 and ensures a stable supply of treated water from the treated water storage tank 200 to the water spraying unit 23.

[0064] (3) The ammonia treatment system 10, 10B according to the third embodiment is the ammonia treatment system 10, 10B of (1) or (2), wherein the ammonia water introduction line 90 comprises an introduction line body 91 connecting the drainage section 25 of the absorption tower 20 and the ammonia component removal section 50, and an ammonia water storage tank 40 provided in the middle of the introduction line body 91 and capable of storing the ammonia water discharged from the drainage section 25.

[0065] As a result, the ammonia water discharged from the drainage section 25 of the absorption tower 20 is stored in the ammonia water storage tank 40 through the introduction line main body 91. Subsequently, the ammonia water stored in the ammonia water storage tank 40 is introduced via the ammonia water introduction line 90 to the ammonia component removal section 50 located outside the absorption tower 20. In this way, the ammonia water discharged from the drainage section 25 of the absorption tower 20 can be stored to some extent in the ammonia water storage tank 40 before being supplied to the ammonia component removal section 50. Therefore, it is not necessary to keep the ammonia component removal section 50 running continuously, thus saving energy.

[0066] (4) The ammonia treatment system 10, 10B according to the fourth embodiment is any one of the ammonia treatment systems 10, 10B of (1) to (3), further comprising: a dilution tank 30 capable of storing absorbent water for absorbing ammonia, and introducing ammonia gas G containing ammonia into the absorbent water to reduce the ammonia concentration of the ammonia gas G; and a second treated water supply line 70 that supplies the treated water generated by the ammonia component removal unit 50 as absorbent water to the dilution tank 30, wherein the gas introduction unit 22 introduces the ammonia gas G diluted in the dilution tank 30 into the casing 21.

[0067] As a result, by introducing ammonia gas G into the absorbent water in the dilution tank 30, the ammonia gas G with diluted ammonia concentration can be introduced into the casing 21 of the absorption tower 20, allowing the absorption tower 20 to absorb ammonia more efficiently. In addition, in the dilution tank 30, the treated water generated by the ammonia component removal unit 50 is supplied as absorbent water through the second treated water supply line 70. This makes effective use of the treated water generated by the ammonia component removal unit 50 and reduces the amount of water introduced from outside for use as absorbent water in the dilution tank 30.

[0068] (5) The ammonia treatment system 10, 10B according to the fifth embodiment is any one of the ammonia treatment systems 10, 10B of (1) to (4), further comprising a water intake unit 58 for taking in seawater, wherein the ammonia component removal unit 50 comprises an electrolysis unit 51 that generates a seawater electrolyte containing sodium hypochlorite by electrolysis of the seawater taken in from the water intake unit 58, and a denitrification reaction unit 53 that reacts a mixture of the ammonia water and the seawater electrolyte generated in the electrolysis unit 51.

[0069] This allows for the production of a seawater electrolyte containing sodium hypochlorite by electrolysis of seawater taken in from the intake section 58, and then a denitrification reaction to occur by reacting this seawater electrolyte with ammonia water, thereby removing ammonia from the ammonia water. In this way, since ammonia can be removed using seawater, in particular, when such ammonia treatment systems 10 and 10B are installed on the floating body 1, it is possible to easily obtain the sodium hypochlorite necessary for ammonia treatment by simply taking in seawater from the sea surrounding the floating body 1.

[0070] (6) The ammonia treatment system 10 according to the sixth embodiment is any one of the ammonia treatment systems 10 of (1) to (5), further comprising an external water introduction unit 80 for introducing water from the outside, and a water switching unit 85 that allows the water supplied to the watering unit 23 to be switched between the treated water supplied by the first treated water supply line 60 and the water introduced by the external water introduction unit 80. This makes it possible to use water introduced from the outside through the external water inlet 80 as the water supplied to the watering unit 23. This increases the options for the water used for watering by the watering unit 23.

[0071] (7) The floating body 1 according to the seventh embodiment comprises a floating body body 2 and one of the ammonia treatment systems 10, 10B from (1) to (6) provided on the floating body body 2. This makes it possible to provide a floating body 1 equipped with an ammonia treatment system 10, 10B that can sufficiently remove ammonia from water containing ammonia. [Explanation of Symbols]

[0072] 1…Floating structure 2…Floating structure body 2a…Bow 4…Superstructure 5A,5B…Side 6…Bottom 7…Upper deck 8…Funnel 10,10B…Ammonia treatment system 20…Absorption tower 21…Casing 21s…Internal space 22…Gas inlet 221…Gas supply line 222…On / off valve 23…Sprayer 232…Nozzle 24…Gas outlet 241…Gas outlet line 25…Drainage section 30…Dilution tank 31…Ammonia inlet line 315…Diffuser 32…Mixing section 321…Mixer 322…Absorption water supply line 323…Absorption water circulation pump 33…Dilution gas inlet line 33f…Dilution fan 35…Absorption water inlet line 36…Fresh water inlet line 38…Dilution absorption water discharge line 40…Ammonia water storage tank 41…Gas discharge line 42... On / off valve 50... Ammonia component removal section 51... Electrolysis section 53... Denitrification reaction section 58... Water intake section 59... Discharge section 60... First treated water supply line 60a... One end 60b... Other end 61... First on / off valve 70... Second treated water supply line 70a... One end 70b... Other end 71... Second on / off valve 80... External water introduction section 81... External water introduction line 82... Third on / off valve 85... Water switching section 90... Ammonia water introduction line 91... Introduction line body 911... Upstream part of introduction line 912... Downstream part of introduction line 100, 100B... Treated water supply line 101, 101B... Main supply line 101a, 101c... One end 101b, 101d... Other end 102, 103... Pump 200... Treated water storage tank FA... Bow and stern direction G... Ammonia gas

Claims

1. An absorption tower having a casing, a gas introduction section for introducing ammonia gas containing ammonia into the casing, a water spraying section for absorbing the ammonia and generating ammonia water by spraying water from the upper part of the casing, and a drainage section for discharging the ammonia water from the lower part of the casing, An ammonia component removal unit is provided outside the absorption tower and removes ammonia components contained in the ammonia water to produce treated water, An ammonia water introduction line for introducing the ammonia water discharged from the drainage section into the ammonia component removal section, A first treated water supply line supplies the treated water generated by the ammonia component removal unit to the water spraying unit, It is equipped with a water intake section for taking in seawater, The ammonia component removal unit is, An electrolysis unit that generates a seawater electrolyte containing sodium hypochlorite by subjecting the seawater taken from the aforementioned intake unit to electrolysis, A denitrification reaction unit that reacts a mixture of ammonia water introduced by the ammonia water introduction line with the seawater electrolyte produced in the electrolysis unit, An ammonia treatment system equipped with the following features.

2. The system further includes a treated water storage tank for storing the treated water generated in the ammonia component removal unit, The first treated water supply line supplies the treated water stored in the treated water storage tank to the water spraying unit. The ammonia treatment system according to claim 1.

3. The aforementioned ammonia water introduction line is An introduction line body connecting the drainage section and the ammonia component removal section of the absorption tower, The system includes an ammonia water storage tank located in the middle of the introduction line body, which is capable of storing the ammonia water discharged from the drainage section. The ammonia treatment system according to claim 1 or 2.

4. A dilution tank is provided that can store absorbent water for absorbing ammonia, and introduces ammonia gas containing ammonia into the absorbent water to reduce the ammonia concentration of the ammonia gas, The system further includes a second treated water supply line that supplies the treated water generated by the ammonia component removal unit to the dilution tank as absorbent water, The gas introduction unit introduces the ammonia gas diluted in the dilution tank into the casing. The ammonia treatment system according to claim 1 or 2.

5. An external water inlet for bringing in water from the outside, A water switching unit that allows switching between the treated water supplied by the first treated water supply line and the water introduced by the external water introduction unit for supplying water to the sprinkling unit, It also has The ammonia treatment system according to claim 1 or 2.

6. The floating body and The floating body is provided with the ammonia treatment system according to claim 1 or 2. A floating object.

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