Seawater tank silt cleaning device and method

Abstract

The invention relates to a seawater tank silt cleaning device which comprises a seawater tank, the seawater tank is cylindrical, water flow flushing pipelines and gas flushing pipelines are arranged on the side wall of the seawater tank at equal angles at intervals, the water flow flushing pipelines and the gas flushing pipelines are cut into the side wall of the seawater tank at equal angles, and the water flow flushing pipelines and the gas flushing pipelines incline downwards at equal angles. Water flow / air flow rushing into the seawater tank forms rotational flow rotating downwards in the seawater tank, so that silt on the inner wall of the seawater tank is scoured; the middle of a bottom plate of the seawater tank is provided with a circular seabed grating, and one or more circles of quicksand holes are formed in the periphery of the bottom plate. Water flow flushing and gas flushing are arranged in the downward rotation direction, downward rotational flow is formed, the cleaning work of automatically removing silt of the seawater tank is achieved, the cleaning cost of the seawater tank is reduced, and the cleaning efficiency is improved.

Description

Technical Field

[0001] The invention relates to a device and method for cleaning silt in a seawater tank, belonging to the technical field of ship design. Background Art

[0002] Seawater tanks are usually installed at the bottom of the ship, with a grid at the bottom, which is directly connected to the seawater and is the entrance for seawater to enter the ship through water pumps. Traditional seawater tank designs usually adopt a rectangular shape, which is superimposed on the grid of the ship's outer plate profiles, making it easier for silt to accumulate. In addition, the inner wall of the seawater tank often requires structural parts such as reinforcing ribs and T-profiles, which increases the difficulty of cleaning. At present, divers usually embed under the ship, open the grid, enter the seawater tank, and clean the silt attached to the inner wall of the seawater tank. The world's major ports near the mouth of rivers are key hubs for global trade, but they have also become a problem for the shipping industry due to the large amount of silt accumulation. Summary of the invention

[0003] The purpose of the present invention is to provide a seawater tank silt cleaning device and a cleaning method thereof, so as to solve the problems of high cost and low efficiency of seawater tank silt cleaning in the prior art.

[0004] The present invention adopts the following technical solutions:

[0005] A device for cleaning silt in a seawater tank comprises a seawater tank, which is cylindrical, and water flushing pipelines and gas flushing pipelines are arranged alternately at equal angles on the side wall of the seawater tank, and the water flushing pipelines and gas flushing pipelines are cut into the side wall of the seawater tank at equal angles, and are both inclined downward at equal angles, so that the water flow / air flow rushing into the seawater tank forms a downward rotating vortex in the seawater tank, thereby flushing the silt on the inner wall of the seawater tank; the bottom plate of the seawater tank has a circular seabed grid 1 in the middle, and the bottom plate has one or more circles of quicksand openings 2 around it. The cylindrical structure has higher strength than the rectangular structure, so more openings can be allowed.

[0006] Preferably, the seawater tank is perpendicular to the base surface of the ship, and the bottom plate of the seawater tank is inclined to adapt to the inclination angle of the bottom of the stern.

[0007] Furthermore, the seabed grid 1 is arranged at the center of the bottom plate.

[0008] Preferably, the water flushing pipeline and the gas flushing pipeline are inclined downward at an angle of 25-35°.

[0009] Preferably, the water flushing pipeline and the gas flushing pipeline are welded and fixed to the openings on the side wall of the seawater tank, and are connected to an elbow via a flange, and the angle of the elbow is selected to adapt to the direction of the pipeline in the ship.

[0010] Preferably, the cylindrical inner wall of the seawater tank is not provided with a profile reinforcement structure, and the inner surface of the seawater tank is smooth.

[0011] Preferably, the water flushing pipeline and the gas flushing pipeline are each provided with two paths, the water pipe of the water flushing pipeline is connected to the fire fighting cabin, and the gas pipe of the gas flushing pipeline is connected to the cabin compression system.

[0012] Furthermore, it also includes an intelligent cleaning control system. The intelligent cleaning system uses valve remote control and pump start and stop remote control. Through the seawater sand content data of various sea areas in different seasons, it intelligently and autonomously provides ship operators with fully automatic and semi-automatic solutions for system use, assisting and guiding crew members to solve the cleaning problems of seawater tanks.

[0013] A method for cleaning silt in a seawater tank adopts the above-mentioned silt cleaning device for the seawater tank, and is divided into two modes: daily cleaning and offshore centralized cleaning: daily cleaning: in offshore waters with a large amount of silt deposited, the high-pressure gear of the fire-fighting main pump or the standby pump is turned on, and the high-pressure seawater is sprayed downward at 30 degrees on the inner tangent surface of the cylindrical seawater tank, and the turbulent flow sweeps the smooth inner surface of the cylinder in a spiral downward, and forms the rotation of the whole sand-containing seawater in the seawater tank, which is similar to the relative movement of the water and the washing bucket in a drum washing machine after it is filled with water. At the same time, the seabed grid is turned on for compressed air blowing to reduce the adhesion of silt and push the silt out of the seawater tank; offshore centralized cleaning: loading or unloading is carried out from the port to the high seas, and the silt is cleaned up in a one-time centralized manner: the first step is to confirm that the seabed door is not blocked and temporarily close the air pipe of the seawater tank; the second step is to inject compressed air to push the seawater level in the seawater tank out of the seabed grid, so that an air cavity is formed in the seawater tank; the third step is to open two water flow flushing pipelines for flushing, and the compressed air and seawater are entangled together to flush away the attached silt along the inner wall of the cylinder. Achieve the effect of thorough cleaning.

[0014] The beneficial effects of the present invention are as follows: a cylindrical seawater tank structure is adopted, and the structural strength of the cylindrical structure itself is better than that of a rectangular parallelepiped. Therefore, after the local wall thickness is thickened through stress analysis, the inner wall does not need to be provided with structural parts such as T-shaped materials, thereby improving the smoothness of the inner wall. In combination with water flushing and gas flushing arranged in a rotating downward direction, a downward vortex is formed, thereby realizing the automatic desilting and cleaning work of the seawater tank, reducing the cleaning cost of the seawater tank and improving the cleaning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural design diagram of a seawater tank silt cleaning device of the present invention.

[0016] Figure 2 yes Figure 1 Detailed view of the seabed grid installation from the perspective of center A.

[0017] Figure 3It is a schematic diagram of the installation of the nozzle on the side wall of the seawater tank.

[0018] Figure 4 yes Figure 3 Axial section of portion B in FIG.

[0019] In the picture, 1. Seabed grid, 2. Quicksand opening, 3. Seawater pipe. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] See also Figure 1-4 A seawater tank silt cleaning device comprises a seawater tank, the seawater tank is cylindrical, and water flushing pipelines and gas flushing pipelines are arranged alternately at equal angles on the side wall of the seawater tank, the water flushing pipelines and gas flushing pipelines are cut into the side wall of the seawater tank at equal angles, and are both inclined downward at equal angles, so that the water flow / air flow rushing into the seawater tank forms a downward rotating vortex in the seawater tank, thereby flushing the silt on the inner wall of the seawater tank; the bottom plate of the seawater tank has a circular seabed grid 1 in the middle, and the bottom plate has one or more circles of quicksand openings 2 around it. The cylindrical structure has a higher strength than the rectangular structure, so it can allow more openings.

[0022] Figure 1 The seawater pipe 3 is used to connect the water in the seawater tank to the seawater pump inside the ship, and to pump the water in the seawater tank into the water storage tank inside the ship.

[0023] In this embodiment, see Figure 1 The seawater tank is perpendicular to the base surface of the ship, and the bottom plate of the seawater tank is inclined to adapt to the inclination angle of the bottom of the stern.

[0024] Continue to see Figure 1 The seabed grid 1 is arranged at the center of the bottom plate.

[0025] In this embodiment, combined with Figure 3 and Figure 4 The water flushing pipeline and the gas flushing pipeline are inclined downward at an angle of 25-35°.

[0026] In this embodiment, see Figure 3 The water flushing pipeline and the gas flushing pipeline are welded and fixed to the openings on the side wall of the seawater tank, and are connected to an elbow through a flange. The angle of the elbow is selected to adapt to the direction of the pipeline in the ship.

[0027] In this embodiment, the cylindrical inner wall of the seawater tank is not provided with a profile reinforcement structure, and the inner surface of the seawater tank is smooth.

[0028] In this embodiment, see Figure 1 The water flushing pipeline and the gas flushing pipeline are each provided with two paths, the water pipe of the water flushing pipeline is connected with the fire fighting cabin, and the gas pipe of the gas flushing pipeline is connected with the cabin compression system.

[0029] In this embodiment, it also includes an intelligent cleaning control system. The intelligent cleaning system uses valve remote control and pump start and stop remote control. Through the seawater sand content data of various sea areas in different seasons, it intelligently and autonomously provides ship operators with fully automatic and semi-automatic solutions for system use, assisting and guiding crew members to solve the cleaning problem of seawater tanks.

[0030] A method for cleaning silt in a seawater tank, using the above-mentioned silt cleaning device for a seawater tank, is divided into two modes: daily cleaning and offshore centralized cleaning:

[0031] Daily cleaning: In offshore waters with a large amount of sediment, the high-pressure gear of the fire-fighting main pump or the standby pump is turned on, and the high-pressure seawater is sprayed 30 degrees downward from the inner tangent surface of the cylindrical seawater tank. The turbulent flow sweeps the relatively smooth inner surface of the cylinder downward in a spiral, and forms a rotation of the sand-containing seawater in the seawater tank, which is similar to the relative movement of the water and the washing bucket in a drum washing machine after it is filled with water. At the same time, the conventionally configured seabed grid is opened for compressed air washing, and the bottom sand discharge passage is opened. On the one hand, it reduces the adhesion of sediment, and more importantly, it pushes a large amount of sediment out of the seawater tank.

[0032] Offshore centralized cleaning: loading or unloading is carried out from the port to the high seas, and the mud and sand are cleaned up in a one-time centralized manner.

[0033] The first step is to temporarily close the seawater tank air pipe (make sure the seabed door is not blocked).

[0034] The second step is to inject compressed air to push the seawater level in the seawater tank out of the seabed grid. This creates an air cavity in the seawater tank.

[0035] The third step is to open the two seawater flushing pipes for flushing. The compressed air and seawater are entangled together, and the impact force is greatly increased, and the attached mud and sand are washed away along the inner wall of the cylinder to achieve the effect of thorough cleaning.

[0036] The design points in the present invention are as follows:

[0037] Cylindrical seawater tank design: The seawater tank is made into a cylinder with a horizontal top plate and an outer plate as the bottom plate. The outer edge of the lower outer plate of the seawater tank has as many quicksand openings as possible, and the seabed grille is arranged in a circular shape. The circular arrangement of the seabed grille helps to improve the efficiency of sediment outflow.

[0038] The cylinder is perpendicular to the base of the ship. At the same time, the arrangement of other structural parts and outfitting parts that may cause bulges is reduced. The addition of coating on the inner surface of the cylindrical seawater tank is a related component to smooth the surface and reduce surface friction.

[0039] Simplified structural design: Under the condition of moderately increasing the thickness of local steel plates, according to finite element calculations, the inner wall of the cylindrical seawater tank, including the top plate and the outer plate, does not require reinforcing ribs, T-profiles and other structural parts, and the surface can be smooth and unobstructed. At the same time, because the bottom (outer plate) of the cylindrical seawater tank is a non-stressed area, a large number of quicksand holes can be added when the spacing between the quicksand holes is greater than the hole diameter, and the quicksand outflow efficiency can also be greatly improved.

[0040] Flushing system design: Two flushing seawater branches are respectively tangent to the cylindrical surface, and the center line of the pipe is tangent to the circular section of the cylinder at a 30° downward spray direction. The two connections are symmetrical along the center line of the cylinder. In addition, there are two compressed air flushing branches tangent to the cylindrical surface, and the center line of the pipe is tangent to the circular section of the cylinder at a 30° downward spray direction. The two connections are symmetrical along the center line of the cylinder. The four connection positions are arranged symmetrically on the same plane at 90 degrees.

[0041] Intelligent control of the cleaning system: The cleaning system uses valve remote control and pump start and stop remote control, and conducts big data analysis on the sand content of seawater in various sea areas in different seasons. It intelligently and autonomously provides ship operators with fully automatic and semi-automatic solutions for system use, assisting and guiding crew members in solving seawater tank cleaning problems.

[0042] The present invention adopts a cylindrical seawater tank structure design. The cylindrical structure itself has better structural strength than a rectangular parallelepiped. Therefore, after the local wall thickness is thickened through stress analysis, the inner wall does not need to be provided with structural parts such as T-shaped materials, thereby improving the smoothness of the inner wall. In combination with water flushing and gas flushing arranged in a rotating downward direction, a downward vortex is formed to realize the automatic desilting and cleaning work of the seawater tank, thereby reducing the cleaning cost of the seawater tank and improving the cleaning efficiency.

[0043] The above are preferred embodiments of the present invention. Those skilled in the art may also make respective changes or improvements thereon. Without departing from the general concept of the present invention, these changes or improvements shall fall within the scope of protection claimed by the present invention.

Claims

1. A seawater tank silt cleaning device, comprising a seawater tank, characterized in that: The seawater tank is cylindrical. Water flushing pipelines and gas flushing pipelines are arranged alternately at equal angles on the side wall of the seawater tank. The water flushing pipelines and gas flushing pipelines are cut into the side wall of the seawater tank at equal angles and are both tilted downward at equal angles, so that the water flow / air flow rushing into the seawater tank forms a downward rotating vortex in the seawater tank, thereby flushing the silt on the inner wall of the seawater tank; The bottom plate of the seawater tank has a circular seabed grid (1) in the middle, and one or more circles of quicksand openings (2) are arranged around the bottom plate.

2. The seawater tank silt cleaning device according to claim 1, characterized in that: The seawater tank is perpendicular to the ship base surface, and the bottom plate of the seawater tank is inclined to adapt to the bottom inclination angle of the stern.

3. The seawater tank silt cleaning device according to claim 2, characterized in that: The seabed grid (1) is arranged at the central part of the bottom plate.

4. The seawater tank silt cleaning device according to claim 1, characterized in that: The water flushing pipeline and the gas flushing pipeline are inclined downward at an angle of 25-35°.

5. The seawater tank silt cleaning device according to claim 1, characterized in that: The water flushing pipeline and the gas flushing pipeline are welded and fixed to the openings on the side wall of the seawater tank, and are connected to an elbow through a flange. The angle of the elbow is selected to adapt to the direction of the pipeline in the ship.

6. The seawater tank silt cleaning device according to claim 1, characterized in that: The cylindrical inner wall of the seawater tank is not provided with a profile reinforcement structure, and the inner surface of the seawater tank is smooth.

7. The seawater tank silt cleaning device according to claim 1, characterized in that: The water flushing pipeline and the gas flushing pipeline are each provided with two paths, the water pipe of the water flushing pipeline is connected with the fire fighting cabin, and the gas pipe of the gas flushing pipeline is connected with the cabin compression system.

8. The seawater tank silt cleaning device according to any one of claims 1 to 7, characterized in that: It also includes an intelligent cleaning control system, which uses valve remote control and pump start and stop remote control. Through the seawater sand content data of various sea areas in different seasons, it intelligently and autonomously provides ship operators with fully automatic and semi-automatic solutions for system use, assisting and guiding crew members to solve the cleaning problems of seawater tanks.

9. A method for cleaning silt in a seawater tank, characterized in that: The seawater tank silt cleaning device according to claim 8 is divided into two modes: daily cleaning and offshore centralized cleaning: Daily cleaning: In offshore waters with a large amount of sediment, the high-pressure gear of the fire-fighting main pump or the standby pump is turned on, and the high-pressure seawater is sprayed out from the inner tangent surface of the cylindrical seawater tank at a downward angle of 30 degrees. The turbulent flow sweeps the smooth inner surface of the cylinder downward in a spiral, and forms a rotation of the sand-containing seawater in the seawater tank, which is similar to the relative movement of the water and the washing bucket in a drum washing machine after it is filled with water. At the same time, the seabed grid is turned on for compressed air to reduce the adhesion of the sediment and push the sediment out of the seawater tank; Offshore centralized cleaning: loading or unloading from the port to the high seas, and cleaning up the silt in one go: The first step is to confirm that the seabed door is not blocked and temporarily close the seawater tank air pipe; The second step is to inject compressed air to push the seawater level in the seawater tank out of the seabed grid, causing an air cavity to form in the seawater tank; The third step is to open two water flows to flush the pipelines. The compressed air and seawater are intertwined to wash away the attached sand along the inner wall of the cylinder, achieving a thorough cleaning effect.

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