Ships

Abstract

To provide a vessel capable of suppressing leakage of a chemical as well as reducing a space for chemical supply.SOLUTION: A pump unit 80 is provided at an upper part of a NaOH tank 44 for storing a NaOH aqueous solution. In this case, when taking into consideration a footprint on a floor (floor of an engine room) on which the NaOH tank 44 is arranged, the footprint for the pump unit 80 can be omitted as much as the pump unit 80 provided at the upper part of the NaOH tank 44. Due to this, a space for chemical supply can be reduced. Furthermore, by providing the pump unit 80 at the upper part of the NaOH tank 44, an NaOH tank extraction pipe 76 in between the pump unit 80 and the NaOH tank 44 can be shortened. Due to this, the possibility of leakage of the NaOH aqueous solution from piping or a joint can be reduced.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a ship. [Background technology]

[0002] In conventional ships, for example, an engine room is defined on the stern side of the hull, and engines such as the main engine are arranged in this engine room. In recent years, regulations on engine exhaust gas (hereinafter simply referred to as "exhaust gas") have become increasingly strict in such ships, and therefore, the installation of a system for performing treatment to remove components contained in the exhaust gas has been proposed (for example, see Patent Document 1 listed below). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 08-010564 Summary of the Invention [Problem to be solved by the invention]

[0004] Here, ships are equipped with tanks that store chemicals to be added to wash water to reduce specific components (such as NOx) in exhaust gases emitted into the atmosphere from internal combustion engines. A supply unit, such as a pump, is also required to supply the chemicals from the tank to the wash water. In this case, the length of the piping between the pump and the tank increases, which can lead to chemical leakage. There is also a need to reduce the installation space required in the engine room, etc.

[0005] The present invention has been made to solve such problems, and has an object to provide a ship that can suppress leakage of chemicals and reduce the space required for supplying chemicals. [Means for solving the problem]

[0006] The ship according to the present invention comprises a tank for storing a chemical to be added to cleaning water for reducing specific components in exhaust gas emitted into the atmosphere from an internal combustion engine, and a supply unit for supplying the chemical to the cleaning water, the supply unit being provided at the top of the tank.

[0007] In the ship according to the present invention, the supply unit is provided above the tank that stores the chemical. In this case, when the footprint of the floor on which the tank is placed is taken into consideration, the footprint of the supply unit can be omitted by providing the supply unit above the tank. This reduces the space required for chemical supply. Furthermore, providing the supply unit above the tank makes it possible to shorten the piping between the supply unit and the tank. This reduces the possibility of chemical leakage from the piping. As described above, chemical leakage can be suppressed and the space required for chemical supply can be reduced.

[0008] The supply unit may take out the chemical from the tank through the upper wall of the tank. In this case, even if a chemical leak occurs in the piping between the supply unit and the tank, the leaked chemical can be received by the upper wall of the tank.

[0009] The vessel may have a drain recovery section for recovering leaked chemicals. This allows the chemicals to be recovered and disposed of in the drain recovery section even if they leak.

[0010] A cleaning device may be provided on the top of the tank. In this case, if a chemical gets on an operator, the chemical can be quickly cleaned with the cleaning device. [Effects of the Invention]

[0011] According to the present invention, it is possible to provide a ship that can suppress leakage of chemicals and reduce the space required for supplying chemicals. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a schematic cross-sectional view showing an example of a ship according to an embodiment of the present invention. [Figure 2]FIG. 1 is a schematic diagram showing the schematic configuration of an EGR system. [Figure 3] FIG. 2 is a perspective view showing the peripheral configuration of the NaOH tank. [Figure 4] 4(a) is a cross-sectional view taken along line IVa-IVa in FIG. 3, and FIG. 4(b) is a cross-sectional view taken along line IVb-IVb in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0013] A preferred embodiment of the exhaust gas treatment system of the present invention will be described below with reference to the drawings. In the following description, the terms "front" and "rear" correspond to the direction of travel of the hull, the term "side" corresponds to the left-right (width) direction of the hull, and the terms "up" and "down" correspond to the up-down direction of the hull.

[0014] 1 is a schematic cross-sectional view showing an example of a ship according to an embodiment of the present invention. The ship 1 is a ship that transports petroleum-based liquid cargo such as crude oil or liquid gas, and is, for example, an oil tanker. Note that the ship is not limited to an oil tanker, and may be, for example, a bulk carrier or various other types of ships.

[0015] As shown in FIG. 1, the ship 1 comprises a hull 11 and a propeller 12. The hull 11 has a bow 2, a stern 3, an engine room 4, a pump room 5, and a cargo room 6. A deck 19 is provided above the hull 11 (or inside the ship). The bow 2 is located at the front of the hull 11. The stern 3 is located at the rear of the hull 11. The bow 2 has a shape that reduces wave-making resistance, for example, when the ship is at a full load draft. The propeller 12 propels the hull 11, and for example, a screw shaft is used. The propeller 12 is installed below the waterline (the surface of the sea W) at the stern 3. In addition, a rudder 15 for adjusting the propulsion direction is installed below the waterline at the stern 3.

[0016] The engine room 4 is located adjacent to the bow side of the stern section 3. The engine room 4 is a compartment for accommodating an engine 16 (internal combustion engine) that provides driving force to the propellers 12. An accommodation area 33 and an exhaust chimney 34 are provided above the engine room 4 on the deck 19. The pump room 5 is located adjacent to the bow side of the engine room 4. The pump room 5 is a compartment for accommodating pumps 17 and other equipment. The cargo hold 6 is located between the bow section 2 and the pump room 5. The cargo hold 6 is a compartment for storing petroleum-based cargo. The cargo hold 6 is divided into a cargo oil tank 26 and a ballast tank 27 by adopting a double hull structure consisting of an outer plating 20 and an inner bottom plating 21. The cargo oil tank 26 holds petroleum-based cargo to be transported by the ship 1. The ballast tank 27 holds ballast water in an amount appropriate to the size of the ship.

[0017] The engine room 4 is provided with an EGR (Exhaust Gas Recirculation) system 40 for reducing predetermined components emitted into the atmosphere from the engine 16. In this embodiment, the EGR system 40 can reduce NOx as one of the predetermined components. The EGR system 40 cools and cleans a portion of the exhaust gas, and then recirculates it to the scavenging air receiver. This replaces some of the oxygen contained in the scavenging air with carbon dioxide produced by combustion. This reduces the oxygen content in the scavenging air and increases its heat capacity, resulting in a lower maximum combustion temperature and a reduction in NOx.

[0018] Fig. 2 is a schematic diagram showing the schematic configuration of the EGR system 40. As shown in Fig. 2, the EGR system 40 includes an EGR unit 41, an RT (Receiving Tank) unit 42, a buffer tank 43, an NaOH tank 44, a drain tank 46, and a WTS (Water Treatment System) 47.

[0019] The EGR unit 41 is a unit that cleans exhaust gas in order to recirculate it. The EGR unit 41 uses a cooling and cleaning process using EGR pre-spray and EGR cooler spray. The EGR unit 41 discharges cleaning water to the RT unit 42. The RT unit 42 receives cleaning water from the EGR unit 41, supplies part of the cleaning water to a buffer tank, and recirculates part of the cleaning water to the EGR unit 41. The RT unit 42 is composed of a receiving tank, a process water circulation pump, an RTU control valve, a pH sensor, etc.

[0020] The buffer tank 43 is a tank for storing wash water and for controlling the amount and quality of the wash water in the EGR process. The buffer tank 43 supplies a portion of the wash water to the EGR unit 41 via a pump 49. The buffer tank 43 also supplies overflowing wash water to a drain tank 46 as drain.

[0021] The NaOH tank 44 is a tank that stores an aqueous NaOH solution (chemical) to be added to cleaning water to reduce NOx in exhaust gas emitted into the atmosphere from the engine 16. The aqueous NaOH solution is a solution for neutralizing sulfuric acid in the system. The NaOH tank 44 is supplied with cleaning liquid flowing from the buffer tank 43 to the EGR unit 41 via a pump 48.

[0022] The drain tank 46 is a tank that stores drainage generated in the system and supplies the drainage to the WTS 47.

[0023] The WTS 47 is a system that treats wash water if contamination occurs while the wash water is circulating in the EGR system 40. The WTS 47 is composed of a separator, a filter, an oil content meter, a WTS control panel, etc. The WTS 47 discharges the treated water outside the ship 1. The WTS 47 also supplies a portion of the water generated for water treatment to the drain tank 46.

[0024] Next, the configuration around the NaOH tank 44 will be described with reference to Fig. 3. Fig. 3 is a perspective view showing the configuration around the NaOH tank 44. In the following description, the structure including the NaOH tank 44 shown in Fig. 3 may be referred to as a tank unit 100.

[0025] As shown in FIG. 3, the tank unit 100 includes the NaOH tank 44, the NaOH drain tank 60, a pump unit 80 (supply unit) including the pumps 48 and 49, and a cleaning device 50. The pumps 48 and 49 can also be arranged independently of the tank unit 100. In FIG. 3, an XYZ coordinate system is set. The X-axis direction is one direction in the horizontal direction. The Y-axis direction is a horizontal direction perpendicular to the X-axis direction. The Z-axis direction is the up-down direction. The positive side of the Z-axis direction is the upper side. In the following description, the "inner side in the horizontal direction" means the side closer to the center position of each tank in the horizontal direction.

[0026] The NaOH drain tank 60 is installed on the floor of the engine room 4. The NaOH drain tank 60 includes side walls 51 and 52 facing each other in the X-axis direction, sides 53 and 54 facing each other in the Y-axis direction, a lower bottom wall 56, and an upper wall 57. The ends of the walls are connected without any gaps so that drain can be stored inside the NaOH drain tank 60. The NaOH drain tank 60 has a flat rectangular box shape with its longitudinal direction in the X-axis direction, but the shape is not particularly limited.

[0027] The NaOH tank 44 is installed on the upper surface of the upper wall portion 57 of the NaOH drain tank 60. The NaOH tank 44 includes side walls 61 and 62 facing each other in the X-axis direction, side walls 63 and 64 facing each other in the Y-axis direction, and an upper wall portion 67 on the upper side. The NaOH tank 44 may share the upper wall portion 57 of the NaOH drain tank 60 as its bottom wall portion, or may have a bottom wall portion as a separate plate-like member on the upper surface of the upper wall portion 57. The ends of the walls are connected without any gaps so that NaOH can be stored inside the NaOH tank 44. The NaOH tank 44 has a flat rectangular box shape with its longitudinal direction in the X-axis direction, but the shape is not particularly limited.

[0028] The side walls 61, 62, 63, and 64 of the NaOH tank 44 are disposed horizontally inward and spaced apart from the side walls 51, 62, 63, and 64 of the NaOH drain tank 60. As a result, a predetermined width of the upper surface of the upper wall 57 of the NaOH drain tank 60 is exposed around the lower end of the NaOH tank 44.

[0029] A thermometer 71 for measuring the temperature of the NaOH aqueous solution stored in the NaOH tank 44 and a level alarm 99 for detecting a drop in the liquid level in the NaOH tank 44 are provided near the bottom of the side wall 61 of the NaOH tank 44. A NaOH tank intake pipe 72, a NaOH tank vent pipe 73, and a manhole 74 are provided on the top wall 67 of the NaOH tank 44. The NaOH tank intake pipe 72 is a pipe that serves as an inlet for introducing the NaOH aqueous solution into the NaOH tank 44. The NaOH tank vent pipe 73 is a pipe that serves as a vent hole for circulating air to prevent an increase or decrease in pressure within the NaOH tank 44. The manhole 74 is a member for closing an opening for maintenance. The arrangement of the thermometer 71, NaOH tank intake pipe 72, NaOH tank vent pipe 73, and manhole 74 is not particularly limited and may be changed as appropriate.

[0030] A pump unit 80 is provided above the NaOH tank 44. The pump unit 80 is disposed on the upper surface of the upper wall portion 67 of the NaOH tank 44 at a position on the positive side in the X-axis direction. A NaOH tank outlet pipe 76 is provided at the end of the pump unit 80 on the negative side in the Y-axis direction. The NaOH tank outlet pipe 76 is a pipe for sucking and extracting the NaOH aqueous solution from the NaOH tank 44. The NaOH tank outlet pipe 76 is bent so that it is inserted vertically from above into the upper wall portion 67 of the NaOH tank 44. Therefore, the pump unit 80 can extract the NaOH aqueous solution in the NaOH tank 44 from the upper wall portion 67 of the NaOH tank 44. An outlet pipe 77 of the pump 49 is provided at the end of the pump unit 80 on the negative side in the Y-axis direction. The outlet pipe 77 is a pipe for supplying the NaOH aqueous solution extracted from the NaOH tank 44 and the cleaning water in the buffer tank 43 downstream.

[0031] When viewed from the top-bottom direction, the pump unit 80 and the NaOH tank outlet pipe 76 overlap the upper wall 67 of the NaOH tank 44 and do not protrude beyond the edge of the upper wall 67. Therefore, if the NaOH aqueous solution leaks from the pump unit 80 and the NaOH tank outlet pipe 76, the leaked NaOH aqueous solution is received by the upper wall 67. The joint portion of the outlet pipe 77 with the pump unit 80 also overlaps with the upper wall 67 when viewed from the top-bottom direction, so the NaOH aqueous solution leaking from the joint portion is received by the upper wall 67.

[0032] A cleaning device 50 is provided above the NaOH tank 44. The cleaning device 50 is located on the upper surface of the upper wall portion 67 of the NaOH tank 44, at a position on the negative side in the X-axis direction. The cleaning device 50 is used by an operator working on the tank unit 100 to clean the tank unit 100 with water. The cleaning device 50 includes a sink 81, a faucet 82, an eye washer 83, and a shower 84. This allows an operator to perform tasks such as cleaning the NaOH aqueous solution adhering to themselves or cleaning certain components on the upper wall portion 67 of the NaOH tank 44. The cleaning device 50 is also provided with water supply pipes 86 to the faucet 82, the eye washer 83, and the shower 84. The cleaning device 50 is also provided with a drainage pipe 87 that drains wastewater from the sink 81.

[0033] The tank unit 100 has a drain collection section 90 that collects leaked NaOH aqueous solution. The drain collection section 90 includes a coaming 91 provided in the NaOH tank 44, a coaming 92 provided in the NaOH drain tank 60, a tank top drain collection pipe 93, and a drain opening 94.

[0034] The cob 91 is a dam member provided to rise upward from the four edges of the upper wall 67 of the NaOH tank 44. FIG. 4(a) is a cross-sectional view taken along line IVa-IVa in FIG. 3. As shown in FIG. 4(a), the lower end of the cob 91 is tightly fixed near the corner between the upper wall 67 and the side wall 63 of the NaOH tank 44. The cob 91 extends upward from this fixed position. As a result, even if the NaOH aqueous solution W1 leaking from the pump unit 80 or the like and received by the upper wall 67 reaches the edge of the upper wall 67, it is blocked by the cob 91 without falling. The blocking effect of the cob 91 is also similarly obtained near the other side walls 61, 62, and 64. Alternatively, the side wall 63 may be extended upward beyond the upper wall 67 without providing the cob 91.

[0035] The cob 92 is a dam member provided to rise upward from the four edges of the upper wall 57 of the NaOH drain tank 60. FIG. 4(b) is a cross-sectional view taken along line IVb-IVb in FIG. 3. As shown in FIG. 4(b), the lower end of the cob 92 is tightly fixed near the corner between the upper wall 57 and the side wall 53 of the NaOH drain tank 60. The cob 92 extends upward from this fixed position. As a result, the NaOH aqueous solution W1 leaking from the NaOH tank 44 and received by the upper wall 57 is blocked by the cob 92 without falling, even if it reaches the edge of the upper wall 57. As a result, the NaOH aqueous solution accumulates in a groove formed by the cob 92, the side wall 63, and the upper wall 57. The blocking effect of the cob 92 is similarly obtained near the other side walls 51, 52, and 54. Also, the coaming 92 may not be provided and the side wall portion 53 may be extended upward beyond the upper wall portion 57 .

[0036] The tank top drain recovery pipe 93 is a pipe that recovers the NaOH aqueous solution accumulated on the upper wall portion 67 of the NaOH tank 44 and drops it into the NaOH drain tank 60. At the end of the upper wall portion 67 on the negative side in the Y-axis direction, near the end on the negative side in the X-axis direction, a portion 93a is formed where the coaming 91 protrudes outward from the side wall portion 63. The upper end of the tank top drain recovery pipe 93 receives the NaOH aqueous solution dropping from this portion 93a. The lower end of the tank top drain recovery pipe 93 extends to the position of a drain opening 94. As a result, the NaOH aqueous solution that passes through the tank top drain recovery pipe 93 drops through the drain opening 94 into the NaOH drain tank 60 and is stored there.

[0037] The drain opening 94 is formed near the end of the upper wall 57 of the NaOH drain tank 60 on the negative side in the Y-axis direction, at the end on the negative side in the X-axis direction. The drain opening 94 is formed by penetrating the upper wall 57 between the side wall 63 and the coaming 92. As a result, the NaOH aqueous solution that has accumulated in the upper wall 57 by the coaming 92 falls into the NaOH drain tank 60 through the drain opening 94 and is collected. A level alarm 96 that detects a rise in the liquid level and issues an alarm is provided near the drain opening 94 on the side wall 51.

[0038] The drain collection unit 90 collects the NaOH aqueous solution by dropping it from the drain opening 94 into the NaOH drain tank 60. The NaOH aqueous solution collected in the NaOH drain tank 60 is discarded. The drain collection unit 90 does not necessarily have to guide the NaOH aqueous solution to the NaOH drain tank 60, but may instead guide it to another tank. The drain collection unit 90 may also be configured to retain leaked NaOH aqueous solution in the combings 91, 92, so that it can be collected by wiping it up and then disposed of.

[0039] Next, the functions and effects of the boat 1 according to this embodiment will be described.

[0040] In the ship 1 according to this embodiment, the pump unit 80 is provided above the NaOH tank 44 that stores the NaOH aqueous solution. In this case, when considering the footprint of the floor (engine room floor) on which the NaOH tank 44 is arranged, the footprint of the pump unit 80 can be reduced by providing the pump unit 80 above the NaOH tank 44. This reduces the space required for chemical supply. Furthermore, providing the pump unit 80 above the NaOH tank 44 makes it possible to shorten the NaOH tank outlet pipe 76 between the pump unit 80 and the NaOH tank 44. This reduces the possibility of the NaOH aqueous solution leaking from piping or joints. As described above, it is possible to suppress leakage of the NaOH aqueous solution and reduce the space required for chemical supply.

[0041] Furthermore, the pump can be easily selected based on its suction performance because the positional relationship between the pump unit 80 and the NaOH tank 44 is necessarily determined. That is, it is no longer necessary to select the pump's performance depending on the location of the chemical supply system.

[0042] The pump unit 80 may extract the aqueous NaOH solution in the NaOH tank 44 from the upper wall portion 67 of the NaOH tank 44. In this case, even if a leak of the aqueous NaOH solution occurs in the NaOH tank outlet pipe 76 between the pump unit 80 and the NaOH tank 44, the leaked aqueous NaOH solution can be received by the upper wall portion 67 of the NaOH tank 44. Furthermore, because the NaOH tank outlet pipe 76 is disposed above the liquid level in the NaOH tank 44, leakage of the aqueous NaOH solution in the NaOH tank 44 due to piping damage when the pump is stopped can be prevented.

[0043] The ship 1 may have a drain recovery unit 90 that recovers leaked NaOH aqueous solution. As a result, even if the NaOH aqueous solution leaks, it can be recovered in the drain recovery unit 90 and disposed of.

[0044] A cleaning device 50 may be provided on the top of the NaOH tank 44. In this case, if a chemical adheres to an operator, the operator can be quickly cleaned with the cleaning device 50.

[0045] The present invention is not limited to the above-described embodiments.

[0046] For example, in the above-described embodiment, the NaOH drain tank 60 is provided below the NaOH tank 44, but a tank other than the NaOH drain tank 60 may be provided, or the NaOH tank 44 may be placed directly on the floor without the NaOH drain tank 60 being provided.

[0047] In the above embodiment, an NaOH aqueous solution is exemplified as the chemical, but urea water, ammonia water, etc. may also be used. Furthermore, the predetermined components that can be reduced by the above system may include SOx, etc., in addition to NOx.

[0048] Furthermore, the position, shape, size, etc. of each component of the tank unit 100 can be changed as appropriate without departing from the spirit of the present invention. [Explanation of symbols]

[0049] 1...ship, 44...NaOH tank (tank), 80...pump unit (supply section), 50...cleaning device, 67...upper wall section, 90...drain collection section.

Claims

1. a tank for storing a chemical to be added to cleaning water for reducing predetermined components in exhaust gas emitted from the internal combustion engine into the atmosphere; a supply unit that supplies the chemical to the cleaning water, The supply unit is provided at an upper portion of the tank, A cleaning device is provided on the upper part of the tank.

2. The vessel according to claim 1 , wherein the supply unit takes out the chemical in the tank from an upper wall of the tank.

3. The ship according to claim 1 or 2, further comprising a drain recovery section for recovering the leaked chemical.

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