Marine LNG tank liquid outlet device capable of effectively reducing heat transfer for long time

Abstract

The utility model discloses a marine LNG tank liquid outlet device capable of effectively reducing heat transfer for a long time. The marine LNG tank liquid outlet device comprises a liquid conveying valve. One end of the liquid conveying pipe is connected with the LNG tank, the other end of the liquid conveying pipe is connected with the liquid conveying valve, and the liquid conveying pipe is provided with a vacuum interlayer in the length direction; and the vacuum sensor is arranged on the infusion tube and is used for monitoring the vacuum of the vacuum interlayer. The gas tank has the advantages that temperature can be effectively isolated, heat transfer of the liquid supply pipeline at the liquid supply stopping stage is greatly reduced, the pressure rising speed in the gas tank is slowed down, and diffusion of the gas tank is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of LNG gas tank liquid outlet devices for ship that can long-term effectively reduce heat transfer. BACKGROUND

[0002] The LNG gas tank liquid supply pipeline used by current inland river LNG power ship has the following prominent problems in technology: (1) when the liquid supply system stops supplying liquid for a long time, the pipeline inside the root stop valve connected with the LNG gas tank is always full of liquid natural gas, the pipeline is single-layer pipe, heat transfer is prone to occur, the liquid natural gas in the pipeline vaporizes by absorbing heat, which leads to the increase of the internal pressure of the gas tank, and further causes the gas tank pressure to exceed the safety value, thereby causing the gas tank to diffuse and waste fuel.(2) the outside temperature of the pipeline is extremely low after heat absorption, which causes frost or ice formation, and if the pipeline is accidentally touched by the staff during equipment maintenance, frostbite injury may occur.Therefore, in view of the defects of the prior art, a LNG gas tank liquid outlet device for ship that can long-term effectively reduce heat transfer is developed. SUMMARY

[0003] The utility model aims at the defects of prior art, and provides a kind of LNG gas tank liquid outlet devices for ship that can long-term effectively reduce heat transfer.

[0004] In order to achieve the above-mentioned purpose of the utility model, the following technical solutions are adopted:

[0005] A LNG gas tank liquid outlet device for ship that can long-term effectively reduce heat transfer, comprising a liquid delivery valve; a liquid delivery pipe fitting, one end of which is connected with the LNG gas tank, the other end is connected with the liquid delivery valve, and the liquid delivery pipe fitting is provided with a vacuum interlayer along the length direction; and a vacuum sensor, which is installed on the liquid delivery pipe fitting and used to monitor the vacuum of the vacuum interlayer.

[0006] Further, the LNG gas tank liquid outlet device for ship that can long-term effectively reduce heat transfer further comprises a vacuum pump, a vacuum valve, a vacuum short pipe and a controller, the vacuum short pipe is installed on the liquid delivery pipe fitting and communicates with the vacuum interlayer; one end of the vacuum valve is connected with the vacuum short pipe, and the other end is connected with the vacuum pump through a vacuum extraction pipe; the vacuum pump, the vacuum valve and the vacuum sensor are electrically connected with the controller.

[0007] Further, the controller is provided with a touch display screen.

[0008] Further, the LNG gas tank liquid outlet device for ship that can long-term effectively reduce heat transfer further comprises a flange plate, both ends of the liquid delivery valve are provided with valve body flanges, the liquid delivery pipe fitting is butted with the corresponding valve body flange through the flange plate and fixedly connected by a plurality of bolts.

[0009] Further, the infusion tube is provided with an infusion channel, and the flange is provided with a through hole in communication with the infusion channel.

[0010] Further, the diameter of the through hole is equal to that of the infusion channel.

[0011] Further, the LNG tank liquid outlet device capable of effectively reducing heat transfer for a long time also comprises an insulation layer, and the sleeve extends to the end of the outer shell and is sleeved with the insulation layer.

[0012] Further, the insulation layer is a polyethylene insulation layer.

[0013] Further, the vacuum sensor is a digital vacuum sensor.

[0014] The utility model has the following progresses compared with the prior art:

[0015] The LNG tank liquid outlet device capable of effectively reducing heat transfer for a long time can reduce heat transfer of the infusion tube from the root valve to the inside of the LNG tank, that is, the infusion tube is provided with a vacuum interlayer along the length direction, the vacuum interlayer can isolate the heat exchange between the liquid LNG in the infusion tube and the external gas, so as to prevent the liquid LNG in the infusion tube from absorbing heat and vaporizing, slow down the vaporization speed of the LNG in the LNG tank, avoid the LNG dispersion caused by the pressure rise in the LNG tank, and save the LNG. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual proportion.

[0017] Fig. 1 It is a hand driving structure schematic view of the LNG tank liquid outlet device capable of effectively reducing heat transfer for a long time for a ship.

[0018] Fig. 2 It is a structure schematic view of the connection between the infusion tube and the sleeve.

[0019] Names and serial numbers of components in the drawings:

[0020] 1-Infusion valve, 101-Valve body flange, 2-Flange, 3-Insulation layer, 4-Sleeve, 5-Infusion pipe, 6-Vacuum jacket, 7-Sealing plate, 8-Vacuum pump, 9-Controller, 10-Vacuum tube, 11-Vacuum short tube, 12-Vacuum sensor, 13-Vacuum valve, 14-LNG tank, 141-Inner liner, 142-Outer liner, 200-Infusion channel, 201-Through hole. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions of this utility model will be clearly and completely described below in conjunction with the accompanying drawings and embodiments. Obviously, the described embodiments are only a part of the embodiments in this application. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0022] Example 1:

[0023] like Figs. 1-2 As shown in the figure, this embodiment discloses a marine LNG tank liquid discharge device that can effectively reduce heat transfer over a long period of time, including a liquid delivery valve 1, a liquid delivery pipe fitting, and a vacuum sensor 12. One end of the liquid delivery pipe fitting is connected to the LNG tank, and the other end is connected to the liquid delivery valve 1, and a vacuum interlayer 6 is provided along the length of the liquid delivery pipe fitting. The vacuum sensor 12 is installed on the liquid delivery pipe fitting and is used to monitor the vacuum in the vacuum interlayer 6.

[0024] The LNG tank 14 includes an inner liner 141 and an outer liner 142, with the outer liner 141 enclosing the inner liner 142. Infusion tubing passes sequentially through the outer liner 141 and the inner liner 142, and is sealed at the penetration point. It is understood that the infusion tubing can be welded to the outer liner 141 and the inner liner 142. The infusion tubing is connected to the inner liner.

[0025] To facilitate on-site vacuum readings by personnel, digital vacuum sensors can be used. These sensors feature a display screen showing the vacuum level detected by the sensor. Personnel can quickly determine the vacuum level of the vacuum jacket by reading the displayed value.

[0026] In some optional embodiments, to ensure that the vacuum jacket maintains the required vacuum level for a long period of time, an additional vacuum pump 8, vacuum valve 13, vacuum short tube 11, and controller 9 are installed. Vacuum short tube 11 is installed on the infusion tubing and communicates with the vacuum jacket 6; one end of vacuum valve 13 is connected to vacuum short tube 11, and the other end is connected to vacuum pump 8 through vacuum tube 10; vacuum pump 8, vacuum valve 13, and vacuum sensor 12 are all electrically connected to controller 9.

[0027] The vacuum sensor 12 monitors the vacuum degree in the vacuum interlayer in real time, and transmits the monitored data information to the controller 9 in real time. The controller 9 can be pre-set with upper and lower limit values of the vacuum degree.

[0028] When the vacuum degree monitored by the vacuum sensor reaches the lower limit value of the vacuum degree, the controller 9 controls the vacuum valve 13 to open and the vacuum pump 8 to work. The vacuum pump 8 extracts the vacuum degree of the vacuum interlayer 6 through the vacuum pipe 10, the vacuum valve 13 and the vacuum short pipe 11. When the vacuum degree of the vacuum interlayer rises to the upper limit value, the controller 9 controls the vacuum valve 13 to close and the vacuum pump 8 to stop working. The vacuum interlayer can effectively isolate heat transfer, thereby preventing the liquid LNG in the liquid delivery pipe from exchanging heat with the external air, and further preventing the liquid LNG in the liquid delivery pipe from absorbing heat and vaporizing. The problem of liquid LNG absorbing heat and vaporizing in the pipeline between the upper root valve of the LNG tank and the LNG tank is solved.

[0029] In some optional embodiments, the controller 9 is provided with a touch display screen for the convenience of viewing the working information of the vacuum pump and the vacuum sensor. The touch display screen can display the vacuum degree monitored by the vacuum sensor and the working information of the vacuum pump.

[0030] It should be noted that the touch display screen can be provided with control buttons, such as start button, pause button and stop button. The start button is used to control the vacuum pump to start working. The pause button is used to control the vacuum pump to pause working. The stop button is used to control the vacuum pump to stop working.

[0031] In some optional embodiments, a connection structure of the liquid delivery pipe and the liquid valve is provided. A flange plate 2 is additionally provided. The two ends of the liquid valve 1 are provided with valve flanges 101. The liquid delivery pipe is connected to the corresponding valve flange 101 through the flange plate 2 and is fixedly connected through a plurality of bolts.

[0032] The liquid delivery pipe is provided with a liquid delivery channel 200. The flange plate 2 is provided with a through hole 201. The through hole 201 is in communication with the liquid delivery channel 200. The liquid delivery channel is in communication with the inner container of the LNG tank. Therefore, the liquid delivery channel contains liquid LNG. The liquid delivery channel is in communication with the through hole 201, and the through hole 201 is in communication with the liquid valve 1.

[0033] The diameter of the through hole 201 is equal to the diameter of the liquid delivery channel 200. This can maximize the communication between the liquid delivery channel and the through hole.

[0034] It should be noted that when the flange plate 2 is connected in alignment with the valve flange 101, a sealing gasket is clamped between the flange plate 2 and the valve flange 101. The sealing gasket can further improve the airtightness of the connection between the flange plate 2 and the valve flange 101.

[0035] The flange plate 2 is fixedly connected with the valve body flange 101 through 4, 5, 6 or 8 bolts.

[0036] It can be understood that the liquid supply valve is a root valve commonly used on the liquid supply system pipeline of the existing LNG tank. The liquid supply valve is installed on the liquid supply pipe fitting through the flange plate 2 and the valve body flange 101, and the liquid supply valve is realized in a detachable manner.

[0037] In some optional embodiments, a structure of the liquid supply pipe fitting is given. As shown in Fig. 1 、 2 The liquid supply pipe fitting includes the liquid supply pipe 5, the sleeve pipe 4 and the sealing plate 7. The sleeve pipe 4 is sleeved on the liquid supply pipe 5, and the two ends are sealingly connected with the liquid supply pipe 5 through the sealing plate 7. The inner circumferential surface of the sealing plate 7 and the sleeve pipe 4 and the outer circumferential surface of the liquid supply pipe 5 form a vacuum interlayer 6.

[0038] The liquid supply pipe 5 and the sleeve pipe 4 are separated by the vacuum interlayer 6, and the vacuum interlayer 6 blocks the heat exchange between the liquid LNG in the liquid supply pipe 5 and the air outside the sleeve pipe 4.

[0039] It can be understood that the spacing space between the liquid supply pipe 5 and the sleeve pipe 4 is sealed at both ends by the sealing plate, and the outer circumferential surface of the sealing plate, the liquid supply pipe 5 and the inner circumferential surface of the sleeve pipe 4 form a closed vacuum space.

[0040] In some optional embodiments, in order to further insulate, an insulating layer 3 is installed, and the sleeve pipe 4 is sleeved with the insulating layer 3 on one end extending out of the outer shell 142.

[0041] One structure of the insulating layer 3 can be a polyethylene insulating layer.

[0042] It can be understood that when the vacuum of the vacuum interlayer fails, the liquid LNG in the sleeve pipe and the liquid supply pipe exchanges heat, and the sleeve pipe is in a low-temperature environment. The insulating layer can form a heat insulation layer to block the heat transfer of the sleeve pipe to the external atmosphere. When the staff touches the insulating layer, frostbite injury caused by the low temperature of the sleeve pipe will not occur.

[0043] Application embodiment:

[0044] The two 5000-ton LNG-powered bulk cargo ships of the Guangxi Xijiang Heavy Industry Co., Ltd. responsible for building the Guangping City China Ocean Transportation Co., Ltd. use the LNG tank liquid outlet device of the utility model for long-term and effective heat transfer reduction. During the stage of stopping the liquid supply pipeline system to supply liquid LNG, the pressure rising speed of the LNG tank on the ship is reduced by 15% compared with the same type of ship. The operation has been more than 1 year, and no frostbite injury event has occurred to the pipeline from the root valve of the LNG tank to the LNG tank during the stage of stopping the liquid supply pipeline to supply liquid.

[0045] Obviously, the above embodiments are only examples for clearly illustrating the present application and are not intended to limit the present application. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments are not required to be enumerated, and the obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A marine LNG tank liquid discharge device that can effectively reduce heat transfer over a long period of time, characterized in that: include Infusion valve (1); An infusion fitting, one end of which is connected to an LNG tank and the other end to an infusion valve (1), and the infusion fitting is provided with a vacuum jacket (6) along its length; and A vacuum sensor (12) is installed on the infusion tubing and is used to monitor the vacuum of the vacuum interlayer (6).

2. The marine LNG tank liquid discharge device that can effectively reduce heat transfer over a long period of time according to claim 1, characterized in that: It also includes a vacuum pump (8), a vacuum valve (13), a vacuum short tube (11), and a controller (9). The vacuum short tube (11) is installed on the infusion tubing and is connected to the vacuum jacket (6). One end of the vacuum valve (13) is connected to the vacuum short tube (11), and the other end is connected to the vacuum pump (8) through a vacuum tube (10). The vacuum pump (8), vacuum valve (13), and vacuum sensor (12) are all electrically connected to the controller (9).

3. The marine LNG tank liquid discharge device that can effectively reduce heat transfer over a long period of time according to claim 2, characterized in that: The controller (9) has a touch screen display.

4. The marine LNG tank liquid discharge device that can effectively reduce heat transfer over a long period of time according to claim 1, characterized in that: It also includes a flange (2), and the two ends of the infusion valve (1) are provided with valve body flanges (101). The infusion fitting is connected to a corresponding valve body flange (101) through the flange (2) and fixed by multiple bolts.

5. The marine LNG tank liquid discharge device that can effectively reduce heat transfer over a long period of time according to claim 4, characterized in that: The infusion fitting is provided with an infusion channel (200), and the flange (2) is provided with a through hole (201), which is connected to the infusion channel (200).

6. The marine LNG tank liquid discharge device that can effectively reduce heat transfer over a long period of time according to claim 5, characterized in that: The diameter of the through hole (201) is equal to the diameter of the infusion channel (200).

7. The marine LNG tank liquid discharge device according to any one of claims 1-6, which can effectively reduce heat transfer over a long period of time, is characterized in that: The infusion tubing includes an infusion tube (5), a sleeve (4) and a sealing plate (7). The sleeve (4) is spaced around the infusion tube (5), and both ends are sealed to the infusion tube (5) through the sealing plate (7). A vacuum interlayer (6) is formed between the inner circumferential surface of the sealing plate (7) and the sleeve (4) and the outer circumferential surface of the infusion tube (5).

8. The marine LNG tank liquid discharge device according to claim 7, which can effectively reduce heat transfer over a long period of time, is characterized in that: It also includes an insulating layer (3), which is sleeved on one end of the sleeve (4) extending out of the outer liner (142).

9. The marine LNG tank liquid discharge device that can effectively reduce heat transfer over a long period of time according to claim 8, characterized in that: The insulating layer (3) is a polyethylene insulating layer.

10. The marine LNG tank liquid discharge device that can effectively reduce heat transfer over a long period of time according to claim 7, characterized in that: The vacuum sensor (12) is a digital display vacuum sensor.

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