Device for reducing residual liquid of liquid cargo in independent cargo tank of liquefied gas carrier

Abstract

The invention discloses a device for reducing residual liquid of liquid cargo in an independent cargo tank of a liquefied gas carrier, which is arranged on the independent cargo tank with a liquid cargo suction pipe and a suction well, the suction well is arranged at the bottom of the independent cargo tank, and the liquid cargo suction pipe is positioned above the suction well; a communicating opening is formed in the bottom of the independent cargo tank, the communicating opening is communicated with the suction well through a communicating pipe, and the communicating pipe is arranged outside the independent cargo tank and located below the bottom of the independent cargo tank. The device is simple and convenient to manufacture; the manufacturing cost is low, the ship floating state does not need to be adjusted by pumping ballast water in a time-consuming and labor-consuming mode, and residual liquid cargo can be absorbed without completely leveling the ship floating state.

Description

Technical Field

[0001] The invention relates to the technical field of ships, and in particular to a device for reducing liquid cargo residual in an independent cargo tank of a liquefied gas ship. Background Art

[0002] Liquefied gas carriers are used to carry low-temperature liquefied cargoes that are in a gaseous state at room temperature. They usually use independent cargo tanks (containers that are not fixedly connected to the hull) for loading. The general practice is to put the independent cargo tanks inside the hull and then use some heat-insulating structures to support them, such as wood and polymer materials.

[0003] The existing independent tank structure is as follows Figure 1 As shown. A liquid cargo suction pipe 41 is provided in the independent cargo tank 40, and the liquid cargo suction pipe is inserted into the wellhead portion at the top of the independent cargo tank. A recessed suction well 42 is provided at the bottom of the cargo tank just below the wellhead. Just like a floor drain, the liquid cargo is introduced into the suction well 42, and the liquid cargo suction pipe 41 is inserted into the suction well 42, so that the liquid cargo in the cargo tank can be sucked out. This structure must ensure that the ship is as flat as possible in order to suck out more liquid cargo. However, ships are generally in a certain longitudinal tilt state, especially stern tilt. The tilt of the ship will cause part of the residual liquid to be concentrated at the tail or bow of the cargo tank, and will not enter the suction well, so that the liquid cargo cannot be sucked out. As shown Figure 1 As shown, the tilt of the ship prevents the residual liquid cargo 43 in the independent cargo tank from entering the suction well 42. In order to make the residual liquid cargo enter the suction well, the ship must be in a flat floating state.

[0004] If the ship needs to be kept in a flat floating state, it is usually necessary to adjust the floating state of the ship by pressurizing the water. However, it is time-consuming and laborious to adjust the floating state of the ship by pressurizing the water so that the ship is kept in a flat floating state. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the above-mentioned defects of the prior art and provide a device for reducing the residual liquid in the independent cargo tank of a liquefied gas carrier.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] A device for reducing liquid cargo residual in an independent cargo tank of a liquefied gas carrier is arranged on an independent cargo tank having a liquid cargo suction pipe and a suction well, the suction well being arranged at the bottom of the independent cargo tank, and the liquid cargo suction pipe being located above the suction well; a connecting port is opened at the bottom of the independent cargo tank, the connecting port and the suction well being connected via a connecting pipe, the connecting pipe being arranged outside the independent cargo tank, and the connecting pipe being located below the bottom of the independent cargo tank.

[0008] Furthermore, there are multiple communication ports, and the multiple communication ports are distributed circumferentially around the suction well.

[0009] Furthermore, a connecting port is provided at a corner point of the head of the independent cargo tank.

[0010] Furthermore, a connecting port is provided at a corner point of the rear end of the independent cargo tank.

[0011] Furthermore, the connecting pipe includes a main body and a vertical portion, the lower end of the vertical portion is connected to the main body, and the upper end of the vertical portion is connected to the connecting port.

[0012] Further, one end of the main body is connected to the vertical portion, and the other end of the main body is connected to the suction well.

[0013] Further, the end of the main body connected to the suction well is higher than the end of the main body connected to the vertical portion.

[0014] Furthermore, the main body is distributed horizontally.

[0015] Furthermore, the independent cargo tank is arranged in the cargo hold of the ship, an insulating layer is arranged on the inner wall of the cargo hold, and a connecting pipe is arranged between the independent cargo tank and the insulating layer.

[0016] Furthermore, the material of the interconnecting pipe is the same as that of the independent cargo tank.

[0017] The beneficial effects of the present invention are as follows: the device of the present invention is simple and easy to manufacture; the manufacturing cost is low, the connecting pipe is arranged inside the insulation, and the connecting pipe material can be the same low-temperature material as the independent cargo tank, and no additional insulation treatment is required; the present invention can effectively solve the problem that the residual liquid of the liquid cargo cannot be sucked out under a certain longitudinal tilt of the ship, and there is no need to spend time and effort to adjust the buoyancy of the ship by pressurizing the water, and the residual liquid cargo can be absorbed without completely leveling the buoyancy of the ship. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of an independent cargo tank in the prior art.

[0019] Figure 2 It is a side view of a preferred embodiment of the present invention.

[0020] Figure 3 for Figure 2 A magnified schematic diagram of part A in FIG.

[0021] Figure 4 It is a top view of a preferred embodiment of the present invention.

[0022] Figure 5 It is a schematic diagram of a preferred embodiment of the present invention when the ship is tilted. DETAILED DESCRIPTION

[0023] A preferred embodiment is given below, and the present invention is described more clearly and completely in conjunction with the accompanying drawings.

[0024] like Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, a device for reducing liquid cargo residual in an independent cargo tank of a liquefied gas ship is provided on an independent cargo tank 10 having a liquid cargo suction pipe 13 and a suction well 11. The independent cargo tank 10 is provided in a cargo hold 30 of a ship, and an insulating layer 31 is provided on the inner wall of the cargo hold.

[0025] The suction well 11 is arranged at the bottom of the independent cargo tank, and the liquid cargo suction pipe 13 is located above the suction well 11 .

[0026] A connecting port 12 is provided at the bottom of the independent cargo tank, and the connecting port 12 and the suction well 11 are connected through a connecting pipe 20 .

[0027] The connecting pipe 20 is arranged outside the independent cargo tank 10, and the connecting pipe 20 is located below the bottom of the independent cargo tank.

[0028] The connecting pipe 20 is provided between the independent cargo tank 10 and the insulating layer 31. The connecting pipe 20 is made of the same material as the independent cargo tank 10.

[0029] There are a plurality of communication ports 12 , and the plurality of communication ports 12 are distributed around the circumference of the suction well 11 .

[0030] A connecting port is provided at the corner point of the head of the independent cargo tank. A connecting port is provided at the corner point of the tail of the independent cargo tank.

[0031] The communication pipe 20 includes a main body 21 and a vertical portion 22 . The lower end of the vertical portion 22 is connected to the main body 21 , and the upper end of the vertical portion 22 is connected to the communication port 12 .

[0032] One end of the main body 21 is connected to the vertical portion 22 , and the other end of the main body 21 is connected to the suction well 11 .

[0033] The main body portion may be in an inclined state, and the end portion of the main body portion 21 connected to the suction well is higher than the end portion of the main body portion 21 connected to the vertical portion.

[0034] In other embodiments, the main body may also be in a horizontal state, and the main body is distributed horizontally.

[0035] In this device, below the bottom of the independent cargo tank for loading liquid cargo, connecting pipes are arranged around the suction well, and the connecting pipes are connected to the connecting ports at the front and rear corners of the independent cargo tank; thus, the suction well is connected to the corners at the bottom of the independent cargo tank. Figure 5As shown, when the ship tilts, the residual liquid cargo 14 in the independent cargo tank enters the suction well 11 through the connecting pipe 20, the suction well and the independent cargo tank are connected, the liquid level in the suction well is level with the liquid level of the residual liquid cargo in the independent cargo tank, and the liquid cargo suction pipe 13 can suck out more residual liquid cargo. Therefore, under a certain longitudinal tilt, the residual liquid cargo can also be drained to the absorption well and sucked out, so as to ensure that more liquid cargo can be discharged during unloading. Since the insulation layer is arranged on the inner wall of the cargo hold, there is a certain space between the insulation layer and the independent cargo tank, and the connecting pipe can be arranged, and at the same time, the insulation requirements of the liquid cargo can be guaranteed.

[0036] The present invention has the following advantages:

[0037] 1. The device is simple and easy to manufacture.

[0038] 2. The manufacturing cost is low. The connecting pipe is set inside the insulation. The connecting pipe material can be the same low-temperature material as the independent cargo tank, and no additional insulation treatment is required.

[0039] 3. It can effectively solve the problem that the residual liquid of the ship cannot be sucked out under a certain longitudinal tilt. There is no need to spend time and effort to adjust the buoyancy of the ship by pressurizing the water, and the residual liquid can be absorbed without completely leveling the buoyancy of the ship.

[0040] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A device for reducing liquid cargo residual in an independent cargo tank of a liquefied gas carrier, which is arranged on an independent cargo tank having a liquid cargo suction pipe and a suction well, the suction well being arranged at the bottom of the independent cargo tank, and the liquid cargo suction pipe being located above the suction well; characterized in that: A connecting port is provided at the bottom of the independent cargo tank, and the connecting port and the suction well are connected through a connecting pipe. The connecting pipe is arranged outside the independent cargo tank, and the connecting pipe is located below the bottom of the independent cargo tank.

2. The device for reducing liquid cargo residual in the independent cargo tank of a liquefied gas carrier according to claim 1, characterized in that: There are multiple communication ports, and the multiple communication ports are distributed around the circumference of the suction well.

3. The device for reducing liquid cargo residual in the independent cargo tank of a liquefied gas carrier according to claim 1, characterized in that: A connecting port is provided at the corner point of the head of the independent cargo tank.

4. The device for reducing liquid cargo residual in an independent cargo tank of a liquefied gas carrier according to claim 1, characterized in that: A connecting port is provided at the corner point of the rear end of the independent cargo tank.

5. The device for reducing liquid cargo residual in an independent cargo tank of a liquefied gas carrier according to claim 1, characterized in that: The connecting pipe comprises a main body and a vertical part, the lower end of the vertical part is connected to the main body, and the upper end of the vertical part is connected to the connecting port.

6. The device for reducing liquid cargo residual in the independent cargo tank of a liquefied gas carrier according to claim 5, characterized in that: One end of the main body is connected to the vertical portion, and the other end of the main body is connected to the suction well.

7. The device for reducing liquid cargo residual in the independent cargo tank of a liquefied gas carrier as claimed in claim 6, characterized in that: The end of the main body connected to the suction well is higher than the end of the main body connected to the vertical portion.

8. The device for reducing liquid cargo residual in the independent cargo tank of a liquefied gas carrier as claimed in claim 6, characterized in that: The main body is distributed horizontally.

9. The device for reducing liquid cargo residual in an independent cargo tank of a liquefied gas carrier according to claim 1, characterized in that: The independent cargo tank is arranged in the cargo hold of the ship, an insulating layer is arranged on the inner wall of the cargo hold, and a connecting pipe is arranged between the independent cargo tank and the insulating layer.

10. The device for reducing liquid cargo residual in an independent cargo tank of a liquefied gas carrier according to claim 1, characterized in that: The material of the interconnecting pipe is the same as that of the independent cargo tanks.

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