Marine desulfurization equipment

Abstract

To provide a vessel desulfurizer capable of spraying cooling water in emergency even without an emergency tank exclusively for emergency cooling water.SOLUTION: A vessel desulfurizer 1 comprises: an absorption tower 2; a spray device 3 that can spray a cleaning liquid to exhaust gas flowing through an internal space of the absorption tower; a cleaning liquid supply device 4 that includes a cleaning liquid supply pump 41 and a cleaning liquid supply pipe 42 through which the cleaning liquid pressurized by the cleaning liquid supply pump is supplied to a first header pipe 32; a first branch pipe 51 through which the cleaning liquid supply pipe is connected to each of a plurality of second spray pipes 33; and an emergency check valve 43 that can prevent a reverse flow to the cleaning liquid supply pump at the stop time of the cleaning liquid supply pump.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a desulfurization device for a ship for desulfurizing exhaust gas discharged from an exhaust gas generation device mounted on a ship. [Background technology]

[0002] In seawater desulfurization, the SOx in the exhaust gas is absorbed and removed by seawater through gas-liquid contact with seawater in an absorption tower. Most of the SOx is SO2, which dissolves in water to form hydrogen sulfite and sulfite, which are oxidized to sulfate in seawater containing oxygen. The sulfates produced are found in large quantities in seawater and have almost no impact on the marine environment. (Reaction scheme) SO2 + H2O → H2SO3 (sulfurous acid) → H + +HSO3 - (bisulfite) HSO3 - (Bisulfite) → H + +SO3 2- (sulfites) SO3 2- (sulfite) + 1 / 2O2 → SO4 2- (sulfates) The formation of sulfites makes seawater acidic, but this is neutralized to some extent by the alkalinity of seawater.

[0003] In recent years, with the strengthening of exhaust gas regulations for ships, the use of fuel oil with a sulfur content of 0.1% or less, or alternative measures with equivalent effects, is now mandatory in emission control areas (ECA). Furthermore, in 2020, the use of fuel oil with a sulfur content of 0.5% or less, or alternative measures with equivalent effects, will also be mandatory in general sea areas. Until now, very large ships such as ULCS (Ultra Large Container Ships) have dealt with this by using low-sulfur fuel oil, but in the future, demand for the installation of desulfurization equipment is expected to increase even in these very large ships.

[0004] Patent Document 1 discloses an emergency cooling device that is configured to supply emergency cooling water from an emergency tank that stores emergency cooling water to a spray pipe of an exhaust gas cooling device and spray the emergency cooling water from cooling water nozzles provided on the spray pipe in an emergency (when power is lost) when no absorbing liquid is sprayed inside the absorption tower. This emergency cooling device can lower the temperature of the exhaust gas by spraying emergency cooling water in an emergency, thereby preventing the absorption tower from breaking down due to the heat of the exhaust gas that remains high without being cooled. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2019-104481 Summary of the Invention [Problem to be solved by the invention]

[0006] The emergency cooling system described in Patent Document 1 requires the provision of an emergency tank for storing emergency cooling water, which poses a problem in that the emergency tank occupies part of the onboard space of the ship on which the flue gas desulfurization system is installed.In addition, installing an emergency cooling system including an emergency tank in the flue gas desulfurization system may increase the size and cost of the flue gas desulfurization system, so there is a need for a desulfurization system for ships that can cool exhaust gas with cooling water in an emergency without having to provide an emergency tank dedicated to emergency cooling water.

[0007] In view of the above circumstances, an object of at least one embodiment of the present invention is to provide a desulfurization device for a ship that can spray cooling water in an emergency without having an emergency tank dedicated to emergency cooling water. [Means for solving the problem]

[0008] A marine desulfurization device according to at least one embodiment of the present invention includes: A ship desulfurization device for desulfurizing exhaust gas discharged from an exhaust gas generation device mounted on a ship, an absorption tower having an internal space for desulfurizing the flue gas, the absorption tower having an exhaust gas inlet for introducing the flue gas into the internal space; A spraying device capable of spraying a cleaning liquid into the exhaust gas flowing through the internal space, the spraying device including: a plurality of first spray pipes arranged in the internal space; a first header pipe connected to each of the plurality of first spray pipes; and a plurality of second spray pipes arranged in the internal space below each of the plurality of first spray pipes and the first header pipe; a cleaning liquid supply device including a cleaning liquid supply pump configured to pressurize the cleaning liquid, and a cleaning liquid supply pipe configured to supply the cleaning liquid pressurized by the cleaning liquid supply pump to the first header pipe; a first branch pipe connecting the cleaning liquid supply pipe and each of the plurality of second spray pipes; an emergency backflow check valve configured to prevent backflow from the cleaning liquid supply pipe to the cleaning liquid supply pump when the cleaning liquid supply pump is stopped, the emergency backflow check valve being provided on the cleaning liquid supply pump side of the connection portion of the cleaning liquid supply pipe with the first branch pipe; Equipped with. [Effects of the Invention]

[0009] According to at least one embodiment of the present invention, a marine desulfurization device is provided that can spray cooling water in an emergency without having an emergency tank dedicated to emergency cooling water. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a schematic diagram of a marine desulfurization device according to one embodiment. [Figure 2] FIG. 2 is an explanatory diagram for explaining a spraying device in a marine desulfurization system according to one embodiment. [Figure 3] 1 is a schematic diagram of a marine desulfurization device according to one embodiment. [Figure 4] 1 is a schematic diagram of a marine desulfurization device according to one embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, several embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of components described as embodiments or shown in the drawings are merely illustrative examples and are not intended to limit the scope of the present invention.

[0012] (Ship desulfurization equipment) Fig. 1 is a schematic diagram of a marine desulfurization apparatus according to one embodiment. The marine desulfurization apparatus 1 is configured to desulfurize exhaust gas discharged from a combustion apparatus (exhaust gas generation apparatus) 11 such as an engine or a boiler. The marine desulfurization apparatus 1 and the combustion apparatus 11 are each mounted on a ship. As shown in Fig. 1, the marine desulfurization apparatus 1 includes an absorption tower 2 having an internal space 21 for desulfurizing the exhaust gas, a spraying device 3 configured to be able to spray a cleaning liquid onto the exhaust gas flowing through the internal space 21, and a cleaning liquid supplying device 4 configured to supply the cleaning liquid to the spraying device 3.

[0013] As shown in Fig. 1, the marine desulfurization system 1 removes sulfur oxides from the exhaust gas by bringing the exhaust gas from the exhaust gas generator 11 into contact with a cleaning solution (absorption solution) in the internal space 21 of the absorption tower 2 and causing the cleaning solution to absorb the sulfur oxides (e.g., sulfur dioxide gas) in the exhaust gas. The marine desulfurization system 1 may use a cleaning solution to which an alkaline component such as caustic soda has been added. When caustic soda is used, sodium sulfate is by-produced.

[0014] In the following description, when simply referring to the upstream side, it refers to the upstream side along the main flow direction of the fluid in the part or area described in the direction. Similarly, in the following description, when simply referring to the downstream side, it refers to the downstream side along the main flow direction of the fluid in the part or area described in the direction.

[0015] (Absorption tower) The absorption tower 2 has an exhaust gas inlet 22 for introducing exhaust gas into the internal space 21 and an exhaust gas outlet 23 for discharging the cleaned exhaust gas from the internal space 21.

[0016] 1 , the absorber 2 includes an absorber main body 24 having a first internal space 21A through which the flue gas flows from bottom to top, and an exhaust gas inlet 25 having a second internal space 21B through which the flue gas flows from top to bottom, for guiding the flue gas from the flue gas inlet 22 to the first internal space 21A. Each of the first internal space 21A and the second internal space 21B is a part of the internal space 21. The absorber main body 24 is configured to define the first internal space 21A therein. The flue gas inlet 25 is configured to define the second internal space 21B therein.

[0017] The first internal space 21A includes a first gas-liquid contact section 21C for bringing the exhaust gas and the cleaning liquid into gas-liquid contact, and a liquid reservoir section 21D located below the first gas-liquid contact section 21C and in which the cleaning liquid that has absorbed sulfur oxides (e.g., sulfur dioxide gas) in the exhaust gas in the first gas-liquid contact section 21C is stored.

[0018] 1, the absorber main body 24 is formed with a communication port 26 for introducing exhaust gas from the second internal space 21B to the first internal space 21A. The communication port 26 is provided below the first gas-liquid contact section 21C and above the liquid pool section 21D, and connects the first internal space 21A to the second internal space 21B. In other words, the second internal space 21B communicates with the first internal space 21A (21E) below the first gas-liquid contact section 21C and above the liquid pool section 21D via the communication port 26. The communication port 26 is provided below the exhaust gas discharge port 23.

[0019] The absorber main body 24 and the flue gas introduction section 25 are each formed in a cylindrical shape extending along the vertical direction. The lower end of the flue gas introduction section 25 is connected to the absorber main body 24, and an flue gas introduction port 22 is formed at the upper end of the flue gas introduction section 25. The flue gas discharge port 23 is provided above the first gas-liquid contact section 21C of the absorber main body 24. The flue gas discharge port 23 is in communication with the first internal space 21A (21F) above the first gas-liquid contact section 21C.

[0020] The exhaust gas from the exhaust gas generator 11 is introduced into the second internal space 21B through the exhaust gas inlet 22. The exhaust gas that flows from above to below in the second internal space 21B is introduced into the first internal space 21A (21E) through the communication port 26. The exhaust gas that flows from below to above in the first internal space 21A is washed with the cleaning liquid as it passes through the first gas-liquid contact section 21C, and sulfur oxides and the like in the exhaust gas are removed. The exhaust gas that has been washed with the cleaning liquid is discharged to the outside of the absorber 2 through the exhaust gas outlet 23 and released into the atmosphere from a chimney or the like.

[0021] (Spraying device) 1, the sprinkler device 3 includes a plurality of first sprinkler pipes 31 arranged in the internal space 21, a first header pipe 32 connected to each of the plurality of first sprinkler pipes 31, and a plurality of second sprinkler pipes 33 arranged in the internal space 21 below each of the plurality of first sprinkler pipes 31 and the first header pipe 32. Each of the plurality of first sprinkler pipes 31, the first header pipe 32, and the plurality of second sprinkler pipes 33 extends horizontally.

[0022] In the illustrated embodiment, each of the multiple first spray pipes 31 is disposed within the first internal space 21A. The first header pipe 32 is provided outside the absorber main body 24 and the flue gas inlet 25. One end of each of the multiple first spray pipes 31 that protrudes to the outside of the absorber main body 24 is connected to the first header pipe 32. Each of the multiple second spray pipes 33 is disposed within the second internal space 21B.

[0023] (watering nozzle) As shown in FIG. 1, the spraying device 3 further includes a plurality of first spray nozzles 34 for spraying cleaning liquid, provided on each of the plurality of first spray pipes 31, and a plurality of second spray nozzles 35 for spraying cleaning liquid, provided on each of the plurality of second spray pipes 33.

[0024] In the illustrated embodiment, each of the plurality of first watering nozzles 34 is configured to be able to spray cleaning liquid upward. Each of the plurality of first watering nozzles 34 has at least one nozzle hole 341 that opens upward, and is configured to spray cleaning liquid upward from the nozzle hole 341.

[0025] In the illustrated embodiment, each of the plurality of second sprinkler nozzles 35 is configured to be able to spray cleaning liquid upward. Each of the plurality of second sprinkler nozzles 35 has at least one nozzle hole 351 that opens upward, and is configured to spray cleaning liquid upward from the nozzle hole 351.

[0026] (Cleaning liquid supply device) 1 , the cleaning liquid supply device 4 includes a cleaning liquid supply pump 41 configured to pressurize the cleaning liquid, and a cleaning liquid supply pipe 42 configured to supply the cleaning liquid pressurized by the cleaning liquid supply pump 41 to the first header pipe 32. One end of the cleaning liquid supply pipe 42 is connected to a cleaning liquid outlet of the cleaning liquid supply pump 41, and the other end of the cleaning liquid supply pipe 42 is connected to the first header pipe 32.

[0027] 1 , the cleaning liquid supply device 4 further includes a cleaning liquid introduction pipe 44 for introducing the cleaning liquid from a cleaning liquid storage source 40 configured to store the cleaning liquid to the cleaning liquid supply pump 41. In the illustrated embodiment, the cleaning liquid storage source 40 includes a liquid reservoir 21D. One end of the cleaning liquid introduction pipe 44 is connected to a cleaning liquid outlet 241 formed in the absorber main body 24 and communicating with the liquid reservoir 21D, and the other end of the cleaning liquid introduction pipe 44 is connected to a cleaning liquid inlet of the cleaning liquid supply pump 41.

[0028] By supplying power to the cleaning liquid supply pump 41 to drive it, the cleaning liquid is introduced from the cleaning liquid storage source 40 to the cleaning liquid supply pump 41 through the cleaning liquid introduction pipe 44 and pressurized. The cleaning liquid pressurized in the cleaning liquid supply pump 41 is sent to each of the multiple first sprinkler pipes 31 through the cleaning liquid supply pipe 42 and the first header pipe 32 and sprayed from each of the multiple first sprinkler nozzles 34 onto the exhaust gas passing through the first gas-liquid contact section 21C. The cleaning liquid sprayed from each of the multiple first sprinkler nozzles 34 comes into contact with the exhaust gas and absorbs and removes sulfur oxides (e.g., sulfur dioxide gas) contained in the exhaust gas. The cleaning liquid sprayed from each of the multiple first sprinkler nozzles 34 and which has absorbed and removed sulfur oxides contained in the exhaust gas falls into the liquid reservoir section 21D and is stored therein.

[0029] 1, the cleaning liquid supply device 4 may further include a cleaning liquid supply line 45 configured to supply the cleaning liquid to the liquid reservoir 21D. The cleaning liquid supply line 45 includes: a cleaning liquid tank 451 disposed outside the absorber 2 and configured to store the cleaning liquid; a cleaning liquid replenishment pipe 452 having one end connected to the cleaning liquid tank 451 and the other end connected to a cleaning liquid supply port 242 formed in the absorber main body 24 and communicating with the first internal space 21A above the liquid reservoir 21D; and a cleaning liquid replenishment valve 453 provided on the cleaning liquid replenishment pipe 452. The cleaning liquid replenishment valve 453 has a valve element for opening and closing the cleaning liquid replenishment pipe 452, and is configured to be able to adjust the amount of cleaning liquid supplied to the liquid reservoir 21D through the cleaning liquid replenishment valve 453 by changing the opening degree of the valve element.

[0030] The absorption tower 2 is configured to circulate the cleaning liquid through the cleaning liquid introduction pipe 44, the cleaning liquid supply pipe 42, the first header pipe 32, and the first spray pipe 31, in this order. The cleaning liquid stored in the liquid reservoir 21D is repeatedly used to scrub the exhaust gas, and therefore sodium sulfate gradually accumulates. If the sodium sulfate accumulates to a certain concentration or more, salting out of the sodium sulfate occurs. Therefore, the cleaning liquid supply device 4 may further include a cleaning liquid discharge line 47, as shown in FIG. 1 , configured to extract the cleaning liquid containing sodium sulfate from the cleaning liquid supply pipe 42 and send it to wastewater treatment equipment 46.

[0031] (filled bed) As shown in FIG. 1 , the absorber main body 24 may further include a packed bed 27 disposed below the first sprinkler pipes 31 in the first internal space 21A and above the communication ports 26. The packed bed 27 includes packing materials 271 arranged therein for contacting the cleaning liquid sprayed from each of the first sprinkler nozzles 34 and passing downward with the flue gas passing upward. The packed bed 27 (packing materials 271) is installed horizontally in the first internal space 21A to increase the contact area (gas-liquid contact area) between the cleaning liquid and the flue gas. The cleaning liquid sprayed from each of the first sprinkler nozzles 34 trickles down the surface of the packing materials 271, causing water droplets to adhere to the surface of the packing materials 271. As the flue gas passes through gaps formed in the packing materials 271, it collides with the surface of the packing materials 271 and flows upward. When the exhaust gas collides with the surface of the filler 271, the exhaust gas is washed by water droplets that adhere to the surface.

[0032] (Mist Eliminator) 1, the absorber main body 24 may further include a mist eliminator 28 configured to remove moisture from the exhaust gas after cleaning with the cleaning liquid. The mist eliminator 28 is provided in the first internal space 21A (21F) above the first gas-liquid contact section 21C or in the exhaust gas discharge port 23.

[0033] (First branch pipe, emergency check valve) As shown in FIG. 1 , a marine desulfurization apparatus 1 according to some embodiments includes the above-described absorption tower 2, the above-described spraying device 3, the above-described cleaning liquid supply device 4, a first branch pipe 51 connecting the cleaning liquid supply pipe 42 to each of the plurality of second spray pipes 33, and an emergency check valve 43 configured to prevent backflow from the cleaning liquid supply pipe 42 to the cleaning liquid supply pump 41 when the cleaning liquid supply pump 41 is stopped. The emergency check valve 43 is provided on the cleaning liquid supply pump 41 side of the connection point P1 of the cleaning liquid supply pipe 42 with the first branch pipe 51. Note that, in the present disclosure, "when the cleaning liquid supply pump 41 is stopped" refers to an emergency such as a sudden stoppage of power supply to the equipment of the marine desulfurization apparatus 1, such as the cleaning liquid supply pump 41. In the present disclosure, "when the cleaning liquid supply pump 41 is operating" refers to a steady state in which power is stably supplied to the equipment of the marine desulfurization apparatus 1, such as the cleaning liquid supply pump 41.

[0034] One end of first branch pipe 51 is connected to cleaning liquid supply pipe 42, and the other end is connected to each of the multiple second spray pipes 33. Emergency backflow check valve 43 may be a check valve configured so that the valve body prevents backflow due to back pressure of the cleaning liquid, or may be a solenoid valve configured to close when power is lost (when not energized). Note that emergency backflow check valve 43 may be configured to prevent backflow from cleaning liquid supply pipe 42 to cleaning liquid supply pump 41 even when cleaning liquid supply pump 41 is operating.

[0035] According to the above configuration, when the cleaning liquid supply pump 41 is operating, the cleaning liquid pressurized by the cleaning liquid supply pump 41 is sent to the multiple first spray pipes 31 via the cleaning liquid supply pipe 42 and the first header pipe 32. As a result, the cleaning liquid is stored inside the first header pipe 32. When the cleaning liquid supply pump 41 is stopped, the emergency check valve 43 prevents backflow from the cleaning liquid supply pipe 42 to the cleaning liquid supply pump 41, so the cleaning liquid stored inside the first header pipe 32 flows down into the multiple second spray pipes 33 arranged below the first header pipe 32 and is sprayed into the internal space 21 of the absorber 2 from the multiple second spray pipes 33 (multiple second spray nozzles 35) as emergency cooling water. In other words, according to the above configuration, the cleaning liquid stored inside the first header pipe 32 can be used as emergency cooling water. In this way, the marine desulfurization apparatus 1 can spray cleaning liquid (cooling water) from the second spray pipe 33 (second spray nozzle 35) in an emergency, even if it is not provided with an emergency tank dedicated to emergency cooling water.

[0036] 1, each of the plurality of first watering nozzles 34 is configured to be able to spray cleaning liquid upward. Each of the plurality of first watering nozzles 34 has at least one nozzle hole 341 that opens upward, and is configured to spray cleaning liquid upward from the nozzle hole 341.

[0037] According to the above configuration, when the cleaning liquid supply pump 41 is operating, the cleaning liquid pressurized by the cleaning liquid supply pump 41 is sent to the multiple first spray pipes 31 and stored inside the multiple first spray pipes 31. The multiple first spray nozzles 34 are configured to be able to spray the cleaning liquid upward. That is, each of the multiple nozzle holes 341 opens upward. When the cleaning liquid supply pump 41 is stopped, the cleaning liquid stored inside the multiple first spray pipes 31 does not flow out from the nozzle holes 341 of the multiple first spray nozzles 34. Therefore, when the cleaning liquid supply pump 41 is stopped, the cleaning liquid stored inside the multiple first spray pipes 31 flows down into the multiple second spray pipes 33 and is sprayed from the second spray pipes 33 into the internal space 21 of the absorber 2 as emergency cooling water. That is, according to the above configuration, the cleaning liquid stored inside the multiple first spray pipes 31 can be used as emergency cooling water.

[0038] 1, the absorber 2 includes an absorber main body 24 having the first internal space 21A described above, and an exhaust gas inlet 25 having the second internal space 21B described above. Each of the plurality of first spray pipes 31 is disposed within the first internal space 21A, and each of the plurality of second spray pipes 33 is disposed within the second internal space 21B.

[0039] According to the above configuration, when the cleaning liquid supply pump 41 is stopped, the cleaning liquid stored inside the first header pipe 32 is sprayed from the second spray pipe 33 into the second internal space 21B as emergency cooling water. By spraying the cleaning liquid into the second internal space 21B, the exhaust gas flowing through the second internal space 21B can be cooled before being introduced into the first internal space 21A. This makes it possible to suppress damage to equipment provided in the first internal space 21A due to the heat of the exhaust gas.

[0040] For example, in the absorber main body 24, a resin sheet may be attached to the inner wall surface facing the first internal space 21A to improve the corrosion resistance of the inner wall surface, and damage to the resin sheet due to the heat of the exhaust gas can be suppressed. Also, the packing material 271 arranged in the packed layer 27 and the mist eliminator 28 may contain a resin material, and damage to the resin material due to the heat of the exhaust gas can be suppressed.

[0041] 1, the absorber 2 includes the absorber main body 24 having the first internal space 21A described above, and the flue gas inlet 25 having the second internal space 21B described above. The sprayer 3 includes a plurality of second spray nozzles 35 provided on each of the plurality of second spray pipes 33. Each of the plurality of second spray pipes 33 is disposed within the second internal space 21B, and the plurality of second spray nozzles 35 includes a plurality of second upward spray nozzles 35A configured to be able to spray the cleaning liquid upward.

[0042] According to the above configuration, when the cleaning liquid supply pump 41 is stopped, the second upward sprinkler nozzle 35A can cool the exhaust gas by spraying cleaning liquid upward onto the exhaust gas flowing from top to bottom through the second internal space 21B. This makes it possible to suppress damage caused by the heat of the exhaust gas that passes around the second upward sprinkler nozzle 35A and is introduced into the first internal space 21A.

[0043] 1, in some embodiments, the above-described marine desulfurization apparatus 1 further includes a flow rate adjustment valve 52 provided in the first branch pipe 51. The flow rate adjustment valve 52 is configured to open at a predetermined opening degree when the cleaning liquid supply pump 41 is operating. The flow rate adjustment valve 52 is configured to open at a predetermined opening degree when power is applied and when power is lost (when power is not applied).

[0044] The second internal space 21B includes a second gas-liquid contact section 21G for bringing the exhaust gas and the cleaning liquid into gas-liquid contact. The second gas-liquid contact section 21G is provided above the plurality of second spray pipes 33. The second gas-liquid contact section 21G is a part of the second internal space 21B.

[0045] When the cleaning liquid supply pump 41 is operating, a portion of the cleaning liquid pressurized in the cleaning liquid supply pump 41 is sent to each of the multiple second sprinkler pipes 33 via the cleaning liquid supply pipe 42 on the side closer to the cleaning liquid supply pump 41 than the connection point P1 with the first branch pipe 51, and through the first branch pipe 51, and is sprayed from each of the multiple second sprinkler nozzles 35 onto the exhaust gas passing through the second gas-liquid contact section 21G. The cleaning liquid sprayed from each of the multiple second sprinkler nozzles 35 comes into contact with the exhaust gas to absorb and remove sulfur oxides (e.g., sulfur dioxide gas) contained in the exhaust gas and lower the temperature of the exhaust gas. The cleaning liquid sprayed from each of the multiple second sprinkler nozzles 35 and which has absorbed and removed sulfur oxides contained in the exhaust gas falls into the liquid reservoir section 21D and is stored therein.

[0046] According to the above configuration, the flow rate adjustment valve 52 provided in the first branch pipe 51 is opened at a predetermined opening when the cleaning liquid supply pump 41 is operating, so that cleaning liquid can be sprayed from the second sprinkler pipe 33 into the internal space 21 not only when the cleaning liquid supply pump 41 is stopped but also when the cleaning liquid supply pump 41 is operating. In other words, when the cleaning liquid supply pump 41 is operating, the second sprinkler pipe 33 sprays cleaning liquid into the internal space 21 to desulfurize the exhaust gas flowing through the internal space 21 and lower the temperature of the exhaust gas. By using the second sprinkler pipe 33 as a dual-purpose facility both when the cleaning liquid supply pump 41 is operating and when it is stopped, the structure of the marine desulfurization device 1 can be kept from becoming too complicated.

[0047] In some embodiments, the flow rate adjustment valve 52 is configured to open at a larger opening when the cleaning liquid supply pump 41 is stopped than when the cleaning liquid supply pump 41 is operating. The flow rate adjustment valve 52 is configured to open at a larger opening when power is lost (when not energized) than when energized. The flow rate adjustment valve 52 may be an electric valve driven by an electric motor, or may be an electromagnetic valve driven by passing a current through an electromagnet.

[0048] According to the above configuration, when the cleaning liquid supply pump 41 is stopped, the flow rate adjustment valve 52 provided in the first branch pipe 51 is opened to a larger degree than when the cleaning liquid supply pump 41 is operating, so that the cleaning liquid stored inside the first header pipe 32 can be made to flow quickly down to the plurality of second sprinkler pipes 33 via the first branch pipe 51. This makes it possible to send to the second sprinkler pipes 33 the cleaning liquid (cooling water) at a flow rate required for spraying from the second sprinkler pipes 33 in an emergency.

[0049] 2 is an explanatory diagram illustrating a spraying device in a marine desulfurization system according to one embodiment. In some embodiments, the absorber main body 24 and the flue gas inlet 25 each have a rectangular cross section perpendicular to the vertical direction, as shown in FIG. 2. In a cross section perpendicular to the vertical direction, the absorber main body 24 includes a first wall 61 extending along a first direction, a second wall 62 extending along the first direction at a position spaced apart from the first wall 61 in a second direction perpendicular to the first direction, a third wall 63 extending along the second direction and connecting one end of the first wall 61 to one end of the second wall 62, and a fourth wall 64 extending along the second direction at a position spaced apart from the third wall 63 in the first direction and connecting the other end of the first wall 61 to the other end of the second wall 62. The first internal space 21A is formed between the first wall portion 61 and the second wall portion 62 in the second direction, and between the third wall portion 63 and the fourth wall portion 64 in the first direction.

[0050] 2, the first header pipe 32 is arranged along one of four wall portions 61, 62, 63, 64 of the absorber main body 24, which has a rectangular cross section perpendicular to the vertical direction. Each of the multiple first spray pipes 31 extends in a direction intersecting (perpendicular to) the extension direction of the first header pipe 32 in a top view. Each of the multiple second spray pipes 33 may extend along the extension direction of the first header pipe 32 in a top view.

[0051] In the embodiment shown in FIG. 2, the first header pipe 32 is disposed along the second wall portion 62 on the outside thereof, and extends in the first direction. Each of the multiple first spray pipes 31 extends along the second direction in a top view, and is disposed at intervals from one another in the first direction. Each of the multiple second spray pipes 33 extends along the first direction in a top view, and is disposed at intervals from one another in the second direction. In this case, it is possible to suppress an increase in the length of the first branch pipe 51 and an increase in piping loss that accompanies such an increase in length. Note that in some other embodiments, the first header pipe 32 may be disposed along the third wall portion 63, the fourth wall portion 64, etc.

[0052] The first branch pipe 51 is provided outside the absorber main body 24 and the exhaust gas inlet part 25. The first branch pipe 51 may include a second header pipe 51A provided at the other end opposite to the one end connected to the cleaning liquid supply pipe 42, and a pipe line 51B connecting the cleaning liquid supply pipe 42 and the second header pipe 51A. The flow rate adjustment valve 52 is provided on the pipe line 51B.

[0053] The second header pipe 51A is arranged along one of the four wall portions of the exhaust gas introduction section 25, which has a rectangular cross section perpendicular to the vertical direction. In the embodiment shown in FIG. 2, the second header pipe 51A is arranged along the wall portion extending along the second direction, and extends along the second direction. One end of each of the multiple second sprinkler pipes 33, which protrudes to the outside of the exhaust gas introduction section 25, is connected to the second header pipe 51A. The first header pipe 32 and the second header pipe 51A each have a larger inner diameter than the multiple first sprinkler pipes 31 and the multiple second sprinkler pipes 33, in order to increase the storage capacity of the cleaning liquid.

[0054] (Second branch pipe, emergency shut-off valve) Fig. 3 is a schematic diagram of a marine desulfurization apparatus according to one embodiment. In some embodiments, the above-described marine desulfurization apparatus 1 further includes a second branch pipe 53 connecting the cleaning liquid supply pipe 42 and each of the plurality of second spray pipes 33, and an emergency on-off valve 54 provided in the second branch pipe 53. The emergency on-off valve 54 is configured to be closed when the cleaning liquid supply pump 41 is operating and to be opened when the cleaning liquid supply pump 41 is stopped. The uppermost portion of each of the first branch pipe 51 and the second branch pipe 53 is located below the first header pipe 32.

[0055] The emergency on-off valve 54 is configured to close when energized and to open at a predetermined opening degree when power is lost (when not energized). The emergency on-off valve 54 may be an electric valve driven by an electric motor, or may be a solenoid valve driven by passing a current through an electromagnet.

[0056] In the illustrated embodiment, one end of the second branch pipe 53 is connected to the first header pipe 32 side of the connection point P1 between the cleaning liquid supply pipe 42 and the first branch pipe 51. The connection point of the cleaning liquid supply pipe 42 with the second branch pipe 53 is designated as P2. The other end of the second branch pipe 53 is connected to the second sprinkler pipe 33 (second header pipe 51A) side of the flow rate adjustment valve 52 of the first branch pipe 51 (pipe 51B). Note that one end of the second branch pipe 53 may be connected to the cleaning liquid supply pump 41 side of the connection point P1 between the cleaning liquid supply pipe 42 and the first branch pipe 51, or may be connected to the end (connection point P1) connected to the cleaning liquid supply pipe 42 side of the flow rate adjustment valve 52 of the first branch pipe 51 (pipe 51B).

[0057] According to the above configuration, the emergency on-off valve 54 provided in the second branch pipe 53 opens when the cleaning liquid supply pump 41 is stopped, so that the cleaning liquid stored inside the first header pipe 32 can be quickly made to flow down to the plurality of second sprinkler pipes 33 via the first branch pipe 51 and the second branch pipe 53. This makes it possible to send to the second sprinkler pipes 33 the cleaning liquid (cooling water) at a flow rate necessary for spraying from the second sprinkler pipes 33 in an emergency. The flow rate adjustment valve 52 may be configured to open or close when the cleaning liquid supply pump 41 is stopped.

[0058] Fig. 4 is a schematic diagram of a marine desulfurization apparatus according to one embodiment. As shown in Figs. 1 to 3, the absorber 2 in some of the above-described embodiments includes the absorber main body 24 having the first internal space 21A and the flue gas inlet 25 having the second internal space 21B. However, the present disclosure is also applicable to an absorber 2 that does not include the flue gas inlet 25, as shown in Fig. 4.

[0059] As shown in Fig. 4, the marine desulfurization apparatus 1 includes an absorber 2 including an absorber main body 24 having the above-described first internal space 21A, the above-described spraying device 3, the above-described cleaning liquid supply device 4, the above-described first branch pipe 51, and the above-described emergency backflow check valve 43. As shown in Fig. 4, the marine desulfurization apparatus 1 may further include the above-described flow rate adjustment valve 52, the above-described second branch pipe 53, and the above-described emergency on-off valve 54. The absorber 2 has an exhaust gas inlet 22 formed at the position where the communication port 26 of the first wall portion 61 is formed.

[0060] 4, each of the plurality of first sprinkler pipes 31 and the plurality of second sprinkler pipes 33 is disposed within the first internal space 21A. In the illustrated embodiment, each of the plurality of second sprinkler pipes 33 is disposed below the plurality of first sprinkler pipes 31 and the packed layer 27, and above the exhaust gas inlet 22 and the liquid reservoir 21D.

[0061] According to the above configuration, when the cleaning liquid supply pump 41 is stopped, the cleaning liquid stored inside the first header pipe 32 is sprayed as emergency cooling water from each of the plurality of second spray pipes 33 into the first internal space 21A below the plurality of first spray pipes 31. The spraying of the cleaning liquid (cooling water) lowers the temperature of the exhaust gas, thereby making it possible to suppress damage caused by the heat of the exhaust gas to equipment provided above the plurality of second spray pipes 33 in the first internal space 21A.

[0062] 4, the absorber main body 24 described above includes a packed bed 27 arranged below the first spray pipe 31 and above the second spray pipe 33 in the first internal space 21A. The plurality of second spray nozzles 35 described above include a plurality of second upward spray nozzles 35A configured to be able to spray the cleaning liquid upward, and a plurality of second downward spray nozzles 35B arranged in the vicinity of the exhaust gas inlet 22 and configured to be able to spray the cleaning liquid downward.

[0063] Note that a position close to the exhaust gas inlet 22 means being located closer to the first wall 61 than the second wall 62 in the second direction (the left-right direction in FIG. 4 ). For example, if each of the multiple second sprinkler pipes 33 is arranged along the second direction, the second sprinkler nozzle 35 located closest to the first wall 61 on each second sprinkler pipe 33 may be designated as the second downward sprinkler nozzle 35B, and the other second sprinkler nozzles 35 may be designated as the second upward sprinkler nozzles 35A. Also, if each of the multiple second sprinkler pipes 33 is arranged along the first direction (the direction perpendicular to the plane of the paper in FIG. 4 ), the multiple second sprinkler nozzles 35 provided on the second sprinkler pipe 33 located closest to the first wall 61 may be designated as the second downward sprinkler nozzle 35B, and the multiple second sprinkler nozzles 35 provided on the other second sprinkler pipes 33 may be designated as the second upward sprinkler nozzles 35A.

[0064] According to the above configuration, each of the multiple second downward sprinkler nozzles 35B arranged in proximity to the flue gas inlet 22 sprays cleaning liquid downward, thereby preventing a decrease in desulfurization performance due to exhaust gas blowing through around the wall peripheral portion of the first internal space 21A on the flue gas inlet 22 side. In addition, the cleaning liquid sprayed from the second downward sprinkler nozzle 35B can quickly cool the flue gas introduced into the first internal space 21A through the flue gas inlet 22. Each of the multiple second upward sprinkler nozzles 35A can cool the packed bed 27 by spraying cleaning liquid upward, thereby suppressing damage to the packed bed 27 due to the heat of the exhaust gas passing through the packed bed 27.

[0065] In this specification, expressions expressing relative or absolute arrangement such as "in a certain direction," "along a certain direction," "parallel," "orthogonal," "center," "concentric," or "coaxial" not only express such an arrangement strictly, but also express a state in which there is a relative displacement with a tolerance or an angle or distance to the extent that the same function is obtained. For example, expressions such as "identical," "equal," and "homogeneous" that indicate that something is in an equal state not only indicate a state of strict equality, but also indicate a state in which there is a tolerance or a difference to the extent that the same function is obtained. Furthermore, in this specification, expressions representing shapes such as a rectangular shape or a cylindrical shape not only represent rectangular shapes or cylindrical shapes in the strict geometric sense, but also represent shapes including uneven portions, chamfered portions, etc., to the extent that the same effect can be obtained. Furthermore, in this specification, the expressions "comprise," "include," or "have" a component are not exclusive expressions that exclude the presence of other components.

[0066] The present disclosure is not limited to the above-described embodiments, but also includes modifications to the above-described embodiments and appropriate combinations of these modifications. 4, the plurality of second sprinkler nozzles 35 are configured to include a plurality of second upward sprinkler nozzles 35A and a plurality of second downward sprinkler nozzles 35B arranged in proximity to the exhaust gas inlet 22, but the plurality of second upward sprinkler nozzles 35A may be replaced with downward sprinkler nozzles, and all of the plurality of second sprinkler nozzles 35 may be configured as downward sprinkler nozzles. By making all of the plurality of second sprinkler nozzles 35 downward sprinkler nozzles, it becomes easier to ensure sufficient cooling time for the exhaust gas introduced from the exhaust gas inlet 22. For example, in the embodiments of Figures 3 and 4 described above, in order to send the cleaning liquid (cooling water) at the flow rate required for spraying from the second sprinkler pipe 33 in an emergency to the second sprinkler pipe 33, a first branch pipe (and a flow control valve 52 provided on the first branch pipe) and a second branch pipe 53 (and an emergency on-off valve 54 provided on the second branch pipe 53) are provided, and the cleaning liquid stored inside the first header pipe 32 is caused to flow down to the second sprinkler pipe 33 through the first branch pipe 51 and the second branch pipe 53. However, by replacing the flow control valve 52 provided on the first branch pipe with an emergency on-off valve configured to open when power is lost (when not powered), the second branch pipe 53 and the emergency on-off valve 54 can be omitted. In this case, the first branch pipe 51 and the emergency on-off valve provided in the first branch pipe are dedicated equipment for causing the cleaning liquid (cooling water) stored inside the first header pipe 32 to flow down to the second spray pipe 33 in the event of an emergency.

[0067] The contents of the above-described embodiments can be understood, for example, as follows.

[0068] 1) A marine desulfurization device (1) according to at least one embodiment of the present disclosure includes: A marine desulfurization device (1) for desulfurizing exhaust gas discharged from an exhaust gas generation device (11) mounted on a marine vessel, an absorber (2) having an internal space (21) for desulfurizing the flue gas, the absorber (2) having an exhaust gas inlet (22) for introducing the flue gas into the internal space (21); a spraying device (3) capable of spraying a cleaning liquid into the exhaust gas flowing through the internal space (21), the spraying device (3) including: a plurality of first spray pipes (31) arranged in the internal space (21); a first header pipe (32) connected to each of the plurality of first spray pipes (31); and a plurality of second spray pipes (33) arranged in the internal space (21) below each of the plurality of first spray pipes (31) and the first header pipe (32); a cleaning liquid supply device (4) including a cleaning liquid supply pump (41) configured to pressurize the cleaning liquid, and a cleaning liquid supply pipe (42) configured to supply the cleaning liquid pressurized by the cleaning liquid supply pump (41) to the first header pipe (32); a first branch pipe (51) connecting the cleaning liquid supply pipe (42) and each of the plurality of second spray pipes (33); and an emergency backflow prevention valve (43) configured to prevent backflow from the cleaning liquid supply pipe (42) to the cleaning liquid supply pump (41) when the cleaning liquid supply pump (41) is stopped, the emergency backflow prevention valve (43) being provided on the cleaning liquid supply pump (41) side relative to a connection part (P1) of the cleaning liquid supply pipe (42) with the first branch pipe (51).

[0069] According to the configuration 1), when the cleaning liquid supply pump (41) is operating, the cleaning liquid pressurized by the cleaning liquid supply pump (41) is sent to the plurality of first spray pipes (31) via the cleaning liquid supply pipe (42) and the first header pipe (32). Therefore, the cleaning liquid is stored inside the first header pipe (32). When the cleaning liquid supply pump (41) is stopped, the emergency check valve (43) prevents backflow from the cleaning liquid supply pipe (42) to the cleaning liquid supply pump (41). Therefore, the cleaning liquid stored inside the first header pipe (32) flows down into the plurality of second spray pipes (33) disposed below the first header pipe (32) and is sprayed from the second spray pipes (33) into the internal space (21) of the absorber (2) as emergency cooling water. In other words, according to the configuration 1), the cleaning liquid stored inside the first header pipe (32) can be used as emergency cooling water. In this way, the marine desulfurization apparatus (1) can spray the cleaning liquid (cooling water) from the second spray pipe (33) in an emergency, even if it does not have an emergency tank dedicated to emergency cooling water.

[0070] 2) In some embodiments, the marine desulfurization device (1) described in 1) above, The cleaning system further includes a flow rate adjustment valve (52) provided in the first branch pipe (51), the flow rate adjustment valve (52) being configured to open at a predetermined opening when the cleaning liquid supply pump (41) is operating.

[0071] According to the above configuration 2), the flow rate adjustment valve (52) provided in the first branch pipe (51) is opened at a predetermined opening when the cleaning liquid supply pump (41) is operating, so that the cleaning liquid can be sprayed from the second sprinkler pipe (33) into the internal space (21) not only when the cleaning liquid supply pump (41) is stopped but also when the cleaning liquid supply pump (41) is operating. In other words, when the cleaning liquid supply pump (41) is operating, the second sprinkler pipe (33) sprays the cleaning liquid into the internal space (21) to desulfurize the exhaust gas flowing through the internal space (21) and lower the temperature of the exhaust gas.

[0072] 3) In some embodiments, the marine desulfurization device (1) described in 2) above, The flow rate adjusting valve (52) is configured so as to open to a greater degree when the cleaning liquid supply pump (41) is stopped than when the cleaning liquid supply pump (41) is operating.

[0073] According to the above configuration 3), when the cleaning liquid supply pump (41) is stopped, the flow rate adjustment valve (52) provided in the first branch pipe (51) opens to a degree of opening greater than when the cleaning liquid supply pump (41) is operating, so that the cleaning liquid stored in the first header pipe (32) can be quickly made to flow down through the first branch pipe (51) to the plurality of second sprinkler pipes (33). This makes it possible to send the cleaning liquid to the second sprinkler pipes (33) at a flow rate necessary for spraying from the second sprinkler pipes (33) in an emergency.

[0074] 4) In some embodiments, the marine desulfurization device (1) described in 2) above, a second branch pipe (53) connecting the cleaning liquid supply pipe (42) and each of the plurality of second spray pipes (33); The cleaning system further includes an emergency on-off valve (54) provided in the second branch pipe (53), the emergency on-off valve (54) being closed when the cleaning liquid supply pump (41) is operating and being opened when the cleaning liquid supply pump (41) is stopped.

[0075] According to the above configuration 4), the emergency on-off valve (54) provided in the second branch pipe (53) opens when the cleaning liquid supply pump (41) is stopped, so that the cleaning liquid stored in the first header pipe (32) can be quickly made to flow down to the plurality of second sprinkler pipes (33) via the first branch pipe (51) and the second branch pipe (53). This makes it possible to send the cleaning liquid to the second sprinkler pipes (33) at a flow rate necessary for spraying from the second sprinkler pipes (33) in an emergency.

[0076] 5) In some embodiments, the marine desulfurization device (1) according to any one of 1) to 4) above, The spraying device (3) further includes a plurality of first spray nozzles (34) provided on each of the plurality of first spray pipes (31), the plurality of first spray nozzles (34) being configured to be able to spray the cleaning liquid upward.

[0077] According to the configuration of 5), when the cleaning liquid supply pump (41) is operating, the cleaning liquid pressurized by the cleaning liquid supply pump (41) is sent to the plurality of first sprinkler pipes (31) and stored inside the plurality of first sprinkler pipes (31). Since the plurality of first sprinkler nozzles (34) are configured to be able to spray the cleaning liquid upward, when the cleaning liquid supply pump (41) is stopped, the cleaning liquid stored inside the plurality of first sprinkler pipes (31) does not flow out from the plurality of first sprinkler nozzles (34). Therefore, when the cleaning liquid supply pump (41) is stopped, the cleaning liquid stored inside the plurality of first sprinkler pipes (31) flows down into the plurality of second sprinkler pipes (33) and is sprayed from the second sprinkler pipes (33) into the internal space (21) of the absorber (2) as cooling water for emergency use. That is, according to the above configuration 5), the cleaning liquid stored inside the plurality of first spray pipes (31) can be used as cooling water in an emergency.

[0078] 6) In some embodiments, the marine desulfurization device (1) according to any one of 1) to 5), The absorption tower (2) an absorber body (24) having a first inner space (21A) through which the exhaust gas flows upward, the first inner space (21A) being a part of the inner space (21); an exhaust gas introduction part (25) having a second internal space (21B) through which the exhaust gas flows from above downward, the second internal space (21B) being a part of the internal space (21), for introducing the exhaust gas from the exhaust gas introduction port (22) into the first internal space (21A); Each of the first sprinkler pipes (31) is disposed in the first inner space (21A), and each of the second sprinkler pipes (33) is disposed in the second inner space (21B).

[0079] According to the above configuration 6), when the cleaning liquid supply pump (41) is stopped, the cleaning liquid or the like stored in the first header pipe (32) is sprayed as emergency cooling water from the second spray pipe (33) into the second internal space (21B). By spraying the cleaning liquid into the second internal space (21B), the exhaust gas flowing through the second internal space (21B) before being introduced into the first internal space (21A) can be cooled. This makes it possible to suppress damage to the equipment provided in the first internal space (21A) due to the heat of the exhaust gas.

[0080] 7) In some embodiments, the marine desulfurization device (1) described in 6) above, the sprinkler device (3) further includes a plurality of second sprinkler nozzles (35) provided on each of the plurality of second sprinkler pipes (33), The plurality of second sprinkler nozzles (35) include a plurality of second upward sprinkler nozzles (35A) configured to be able to spray the cleaning liquid upward.

[0081] According to the configuration of 7), when the cleaning liquid supply pump (41) is stopped, the second upward sprinkler nozzle (35A) sprays cleaning liquid upward onto the exhaust gas flowing from top to bottom through the second internal space (21B), thereby cooling the exhaust gas. This makes it possible to suppress damage caused by the heat of the exhaust gas that passes around the second upward sprinkler nozzle (35A) and is introduced into the first internal space (21A).

[0082] 8) In some embodiments, the marine desulfurization device (1) according to any one of 1) to 5), The absorption tower (2) an absorber body (24) having a first internal space (21A) through which the exhaust gas flows from below to above, the first internal space (21A) being at least a part of the internal space (21); Each of the plurality of first sprinkler pipes (31) and the plurality of second sprinkler pipes (33) is disposed in the first inner space (21A).

[0083] According to the above configuration 8), when the cleaning liquid supply pump (41) is stopped, the cleaning liquid or the like stored inside the first header pipe (32) is sprayed as emergency cooling water from each of the second spray pipes (33) into the first internal space (21A) below the first spray pipes (31). The spraying of the cleaning liquid (cooling water) reduces the temperature of the exhaust gas, thereby making it possible to suppress damage caused by the heat of the exhaust gas to equipment provided above the second spray pipes (33) in the first internal space (21A).

[0084] 9) In some embodiments, the marine desulfurization device (1) described in 8) above, the absorber body (24) includes a packed bed (27) that is arranged below the first spray pipe (31) and above the second spray pipe (33) in the first internal space (21A), the sprinkler device (3) further includes a plurality of second sprinkler nozzles (35) provided on each of the plurality of second sprinkler pipes (33), The plurality of second sprinkler nozzles (35) a plurality of second upward sprinkler nozzles (35A) configured to be able to spray the cleaning liquid upward; and a plurality of second downward sprinkler nozzles (35B) that are arranged in the vicinity of the exhaust gas inlet (22) and are configured to be able to spray the cleaning liquid downward.

[0085] According to the above configuration 9), each of the plurality of second downward sprinkler nozzles (35B) arranged in the vicinity of the flue gas inlet (22) sprays cleaning liquid downward, thereby preventing a decrease in desulfurization performance due to the exhaust gas blowing through the periphery of the wall of the first internal space (21A) on the flue gas inlet (22) side. Furthermore, the cleaning liquid sprayed from the second downward sprinkler nozzle (35B) can quickly cool the flue gas introduced into the first internal space (21A) through the flue gas inlet (22). Each of the plurality of second upward sprinkler nozzles (35A) sprays cleaning liquid upward to cool the packed bed (27), thereby suppressing damage to the packed bed (27) due to the heat of the exhaust gas passing through the packed bed (27). [Explanation of symbols]

[0086] 1 Ship desulfurization equipment 2. Absorption tower 3 Spraying equipment 4. Cleaning liquid supply device 11 Exhaust gas generator 21 Interior Space 21A 1st internal space 21B 2nd internal space 21C 1st gas-liquid contact part 21D Liquid pool 21G 2nd gas-liquid contact part 22 Exhaust gas inlet 23 Exhaust gas outlet 24 Absorber main body 25 Exhaust gas inlet 26 Contact point 27 Filled bed 28 Mist Eliminator 31 No. 1 sprinkler pipe 32 First header pipe 33 Second sprinkler pipe 34 No. 1 sprinkler nozzle 35 Second sprinkler nozzle 40 Storage Source 41 Cleaning liquid supply pump 42 Cleaning fluid supply pipe 43 Emergency check valve 44 Cleaning solution introduction pipe 45 Cleaning solution supply line 46 Wastewater treatment facilities 47 Cleaning solution discharge line 51 First branch pipe 51A Second header pipe 51B Pipeline 52 Flow control valve 53 Second branch pipe 54 Emergency shut-off valve 61 1st wall 62 2nd wall section 63 Third wall 64 4th wall

Claims

1. A ship desulfurization device for desulfurizing exhaust gas discharged from an exhaust gas generation device mounted on a ship, an absorption tower having an internal space for desulfurizing the flue gas, the absorption tower having an exhaust gas inlet for introducing the flue gas into the internal space; a spraying device capable of spraying a cleaning liquid into the exhaust gas flowing through the internal space, the spraying device including: a plurality of first spray pipes arranged in the internal space; a first header pipe connected to each of the plurality of first spray pipes; and a plurality of second spray pipes arranged in the internal space below each of the plurality of first spray pipes and the first header pipe; a cleaning liquid supply device including: a cleaning liquid supply pump configured to pressurize the cleaning liquid; and a cleaning liquid supply pipe configured to supply the cleaning liquid pressurized by the cleaning liquid supply pump to the first header pipe; a first branch pipe connecting the cleaning liquid supply pipe and each of the plurality of second spray pipes; an emergency backflow check valve configured to prevent backflow from the cleaning liquid supply pipe to the cleaning liquid supply pump when the cleaning liquid supply pump is stopped, the emergency backflow check valve being provided on the cleaning liquid supply pump side of the connection portion of the cleaning liquid supply pipe with the first branch pipe; Equipped with The exhaust gas flowing through the internal space passes through the second sprinkler pipe and then reaches the first sprinkler pipe, The first header pipe is arranged between the first sprinkler pipe and the second sprinkler pipe in the height direction. Desulfurization equipment for ships.

2. A desulfurization device for a ship for desulfurizing exhaust gas emitted from an exhaust gas generating device mounted on a ship, comprising: an absorption tower having an internal space for desulfurizing the flue gas, the absorption tower having an exhaust gas inlet for introducing the flue gas into the internal space; a spraying device capable of spraying a cleaning liquid into the exhaust gas flowing through the internal space, the spraying device including: a plurality of first spray pipes arranged in the internal space; a first header pipe connected to each of the plurality of first spray pipes; and a plurality of second spray pipes arranged in the internal space below each of the plurality of first spray pipes and the first header pipe; a cleaning liquid supply device including: a cleaning liquid supply pump configured to pressurize the cleaning liquid; and a cleaning liquid supply pipe configured to supply the cleaning liquid pressurized by the cleaning liquid supply pump to the first header pipe; a first branch pipe connecting the cleaning liquid supply pipe and each of the plurality of second spray pipes; an emergency backflow check valve configured to prevent backflow from the cleaning liquid supply pipe to the cleaning liquid supply pump when the cleaning liquid supply pump is stopped, the emergency backflow check valve being provided on the cleaning liquid supply pump side of the connection portion of the cleaning liquid supply pipe with the first branch pipe; Equipped with a flow rate adjustment valve provided in the first branch pipe, the flow rate adjustment valve being configured to open at a predetermined opening when the cleaning liquid supply pump is operating; the flow rate adjustment valve is configured to open at a larger opening when the cleaning liquid supply pump is stopped than when the cleaning liquid supply pump is operating. Desulfurization equipment for ships.

3. A desulfurization device for a ship for desulfurizing exhaust gas emitted from an exhaust gas generating device mounted on a ship, comprising: an absorption tower having an internal space for desulfurizing the flue gas, the absorption tower having an exhaust gas inlet for introducing the flue gas into the internal space; a spraying device capable of spraying a cleaning liquid into the exhaust gas flowing through the internal space, the spraying device including: a plurality of first spray pipes arranged in the internal space; a first header pipe connected to each of the plurality of first spray pipes; and a plurality of second spray pipes arranged in the internal space below each of the plurality of first spray pipes and the first header pipe; a cleaning liquid supply device including: a cleaning liquid supply pump configured to pressurize the cleaning liquid; and a cleaning liquid supply pipe configured to supply the cleaning liquid pressurized by the cleaning liquid supply pump to the first header pipe; a first branch pipe connecting the cleaning liquid supply pipe and each of the plurality of second spray pipes; an emergency backflow check valve configured to prevent backflow from the cleaning liquid supply pipe to the cleaning liquid supply pump when the cleaning liquid supply pump is stopped, the emergency backflow check valve being provided on the cleaning liquid supply pump side of the connection portion of the cleaning liquid supply pipe with the first branch pipe; Equipped with a flow rate adjustment valve provided in the first branch pipe, the flow rate adjustment valve being configured to open at a predetermined opening when the cleaning liquid supply pump is operating; a second branch pipe connecting the cleaning liquid supply pipe and each of the plurality of second spray pipes; an emergency on-off valve provided in the second branch pipe, the emergency on-off valve being closed when the cleaning liquid supply pump is operating and being opened when the cleaning liquid supply pump is stopped; Desulfurization equipment for ships.

4. A marine desulfurization device for desulfurizing exhaust gas emitted from an exhaust gas generating device mounted on a ship, comprising: an absorption tower having an internal space for desulfurizing the flue gas, the absorption tower having an exhaust gas inlet for introducing the flue gas into the internal space; a spraying device capable of spraying a cleaning liquid into the exhaust gas flowing through the internal space, the spraying device including: a plurality of first spray pipes arranged in the internal space; a first header pipe connected to each of the plurality of first spray pipes; and a plurality of second spray pipes arranged in the internal space below each of the plurality of first spray pipes and the first header pipe; a cleaning liquid supply device including: a cleaning liquid supply pump configured to pressurize the cleaning liquid; and a cleaning liquid supply pipe configured to supply the cleaning liquid pressurized by the cleaning liquid supply pump to the first header pipe; a first branch pipe connecting the cleaning liquid supply pipe and each of the plurality of second spray pipes; an emergency backflow check valve configured to prevent backflow from the cleaning liquid supply pipe to the cleaning liquid supply pump when the cleaning liquid supply pump is stopped, the emergency backflow check valve being provided on the cleaning liquid supply pump side of the connection portion of the cleaning liquid supply pipe with the first branch pipe; Equipped with The absorption tower comprises: an absorber body having a first internal space through which the exhaust gas flows from below to above, the first internal space being at least a part of the internal space; Each of the plurality of first sprinkler pipes and the plurality of second sprinkler pipes is disposed within the first internal space. Desulfurization equipment for ships.

5. A desulfurization device for a ship for desulfurizing exhaust gas emitted from an exhaust gas generating device mounted on a ship, comprising: an absorption tower having an internal space for desulfurizing the flue gas, the absorption tower having an exhaust gas inlet for introducing the flue gas into the internal space; a spraying device capable of spraying a cleaning liquid into the exhaust gas flowing through the internal space, the spraying device including: a plurality of first spray pipes arranged in the internal space; a first header pipe connected to each of the plurality of first spray pipes; and a plurality of second spray pipes arranged in the internal space below each of the plurality of first spray pipes and the first header pipe; a cleaning liquid supply device including: a cleaning liquid supply pump configured to pressurize the cleaning liquid; and a cleaning liquid supply pipe configured to supply the cleaning liquid pressurized by the cleaning liquid supply pump to the first header pipe; a first branch pipe connecting the cleaning liquid supply pipe and each of the plurality of second spray pipes; an emergency backflow check valve configured to prevent backflow from the cleaning liquid supply pipe to the cleaning liquid supply pump when the cleaning liquid supply pump is stopped, the emergency backflow check valve being provided on the cleaning liquid supply pump side of the connection portion of the cleaning liquid supply pipe with the first branch pipe; Equipped with When the cleaning liquid supply pump is stopped, the cleaning liquid stored inside the first header pipe is caused to flow down into each of the plurality of second spray pipes. Desulfurization equipment for ships.

6. The spraying device further includes a plurality of first spray nozzles provided on the plurality of first spray pipes, each of the plurality of first spray nozzles being configured to be able to spray the cleaning liquid upward. The desulfurization device for a ship according to any one of claims 1 to 5.

7. The absorption tower comprises: an absorber body having a first internal space that is a part of the first internal space, through which the exhaust gas flows from below to above; an exhaust gas inlet having a second internal space, through which the exhaust gas flows from above downward, for guiding the exhaust gas from the exhaust gas inlet to the first internal space, the second internal space being a part of the internal space; Each of the plurality of first sprinkler pipes is disposed within the first internal space, and each of the plurality of second sprinkler pipes is disposed within the second internal space. The desulfurization device for a ship according to any one of claims 1 to 5.

8. The sprinkler device further includes a plurality of second sprinkler nozzles provided on each of the plurality of second sprinkler pipes, The plurality of second watering nozzles include a plurality of second upward watering nozzles configured to be able to spray the cleaning liquid upward. The desulfurization device for a ship according to claim 7.

9. the absorption tower main body includes a packed bed arranged below the first sprinkler pipe and above the second sprinkler pipe in the first internal space, The sprinkler device further includes a plurality of second sprinkler nozzles provided on each of the plurality of second sprinkler pipes, The plurality of second watering nozzles are a plurality of second upward spray nozzles configured to be able to spray the cleaning liquid upward; a plurality of second downward spray nozzles arranged in proximity to the exhaust gas inlet and configured to be able to spray the cleaning liquid downward; The desulfurization device for a ship according to claim 4.

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