Device for controlling LNG (Liquefied Natural Gas) of LNG power-driven ship to diffuse and escape

Abstract

The utility model discloses a device for controlling LNG (Liquefied Natural Gas) diffusion and escape of an LNG power-driven ship, an LNG tank is provided with an LNG liner and a heat insulation vacuum layer, and the heat insulation vacuum layer is provided with a vacuum pressure sensor; the vacuumizing piece is connected with the heat insulation vacuum layer and is used for vacuumizing the heat insulation vacuum layer; the pressure sensor is installed on the LNG tank and used for monitoring the air pressure of the LNG inner container; the diffusion anti-escape mechanism penetrates through the heat insulation vacuum layer and is connected with the LNG inner container; wherein when the pressure sensor monitors that the air pressure of the LNG inner container rises to a set value, the controller controls the diffusion anti-escape mechanism to work, meanwhile, the LNG inner container releases LNG gas to the diffusion anti-escape mechanism, and the diffusion anti-escape mechanism collects and stores the released LNG gas.

Description

Technical Field

[0001] The utility model relates to LNG dispersing equipment, in particular to a device for controlling LNG dispersing and escaping from an LNG powered ship. Background Art

[0002] Inland LNG powered ships refer to ships that use liquefied natural gas (LNG) as their main fuel. Liquefied natural gas (LNG) is usually stored in LNG tanks.

[0003] The inventor discovered during work that the LNG tank needs to be released at regular intervals (such as 5 to 20 days). Inspection revealed that air infiltrated the thermal insulation vacuum layer of the LNG tank, causing the vacuum degree of the thermal insulation vacuum layer to decrease, reducing the thermal insulation effect and causing the tank pressure to increase. In order to relieve pressure, the LNG tank releases LNG into the atmosphere through a pressure relief valve. The amount of LNG released accounts for 10% to 30% of the gas storage capacity of the tank, causing great waste, increasing the energy consumption cost of the ship, and seriously affecting the economic efficiency of ship operations. The LNG gas (mainly methane) is released into the atmosphere, causing environmental pollution. Utility Model Content

[0004] The utility model aims to provide a device for controlling the release and escape of LNG from an LNG powered ship in view of the defects of the prior art.

[0005] In order to achieve the above-mentioned purpose of the utility model, the following technical solutions are adopted:

[0006] A device for controlling the release and escape of LNG from an LNG-powered ship comprises an LNG tank, wherein the LNG tank is provided with an LNG liner and an insulating vacuum layer, wherein the insulating vacuum layer wraps the LNG liner, and the insulating vacuum layer is provided with a vacuum pressure sensor; a vacuum pumping component, wherein the vacuum pumping component is connected to the insulating vacuum layer and is used to extract the vacuum in the insulating vacuum layer; a pressure sensor, wherein the pressure sensor is installed on the LNG tank and is used to monitor the air pressure of the LNG liner; a release and escape prevention mechanism, wherein the release and escape prevention mechanism penetrates the insulating vacuum layer and is connected to the LNG liner; and a controller, wherein the vacuum pressure sensor, the pressure sensor, the vacuum pumping component, and the release and escape prevention mechanism are all electrically connected to the controller; wherein, when the pressure sensor monitors that the air pressure of the LNG liner rises to a set value, the controller controls the release and escape prevention mechanism to work, while the LNG liner releases LNG gas to the release and escape prevention mechanism, and the release and escape prevention mechanism collects and stores the leaked LNG gas.

[0007] Furthermore, the release and anti-escape mechanism includes a compressor, one end of which is connected to the LNG tank through a collecting pipe; and a storage tank, the other end of which is connected to the compressor through a guide pipe.

[0008] Furthermore, the anti-escape mechanism in the utility model also includes a first control valve and a second control valve; the first control valve is installed on the collecting pipe to control the conduction and cutoff of the collecting pipe; the second control valve is installed on the guiding pipe to control the conduction and cutoff of the guiding pipe; wherein the first control valve, the second control valve and the compressor are all electrically connected to the controller.

[0009] Furthermore, the anti-escape mechanism in the utility model also includes an air supply pipe, a fourth control valve and a pressure regulating valve; one end of the air supply pipe is connected to the storage tank, and the other end extends outward; the fourth control valve and the pressure regulating valve are installed in the air supply pipe in sequence according to the gas flow direction of the air supply pipe, the fourth control valve is used to control the conduction and cutoff of the air supply pipe, and the pressure regulating valve is used to adjust the gas pressure output by the air supply pipe.

[0010] Furthermore, the anti-escape mechanism in the utility model also includes a safety valve, a third control valve and a pressure gauge. The safety valve and the third control valve are respectively installed on the storage tank, and the pressure gauge is installed on the third control valve for monitoring the air pressure of the storage tank.

[0011] Furthermore, the vacuum pump includes a vacuum pump, a vacuum control valve and a vacuum pipe. The vacuum pump is connected to the thermal insulation vacuum layer through the vacuum pipe, and the vacuum control valve is installed on the vacuum pipe. The vacuum pump and the vacuum control valve are both electrically connected to the controller.

[0012] Furthermore, the utility model provides a device for controlling the release and escape of LNG from an LNG-powered ship, which also includes a temperature sensor and a heater. The temperature sensor is installed on the LNG tank to monitor the temperature of the insulating vacuum layer; the heater is installed on the insulating vacuum layer; and the temperature sensor and the heater are both electrically connected to the controller.

[0013] Furthermore, the utility model provides a device for controlling the release and escape of LNG from an LNG-powered ship, and further includes an adding mechanism, which is installed on the LNG tank and connected to the thermal insulation vacuum layer, and is used for adding an adsorbent to the thermal insulation vacuum layer.

[0014] Furthermore, the adding mechanism includes a material guide pipe, a feeding valve and a feeding hopper; one end of the material guide pipe passes through the LNG gas tank and is inserted into the vacuum layer, and the other end extends outward to be connected to the feeding hopper, and at least two feeding valves are installed on the material guide pipe, and the feeding valve is used to control the conduction and cutoff of the material guide pipe.

[0015] Furthermore, the utility model provides a device for controlling the release and escape of LNG from an LNG-powered ship, which also includes an air guide pipe, a fifth control valve, an LNG vaporization module and an air supply pipe; one end of the air guide pipe is connected to the LNG gas tank, and the other end extends outwardly to be connected to the LNG vaporization module, and a fifth control valve is installed thereon; the LNG vaporization module is provided with an air supply pipe for transporting LNG gas to the main engine or generator of the LNG-powered ship.

[0016] The present invention has significant improvements over the prior art:

[0017] 1. The utility model has the function of real-time online monitoring of the vacuum degree of the vacuum layer of the LNG gas tank, which provides a direct basis for ship driving and maintenance personnel to judge the thermal insulation effect of the gas tank and handle faults. It can extend the service life of the gas tank, because it can add adsorbents to the vacuum layer to maintain its long-term air adsorption efficiency, and solve the problem of the gas tank service life being affected by the decrease in the vacuum degree of the gas tank insulation vacuum layer. It can also realize autonomous control of the vacuum degree of the gas tank insulation vacuum layer, always maintain efficient thermal insulation performance, and avoid the frequent release of LNG caused by the increase in the vaporization pressure of the liquid natural gas in the gas tank due to the absorption of external heat. It can also effectively control the gas tank pressure within a safe range in a non-releasing and non-wasting manner.

[0018] 2. The utility model can avoid the waste of LNG resources and environmental pollution, significantly improve the economic and environmental performance of ship operations, and greatly reduce the risk of fire or gas poisoning caused by natural gas release, thus solving the problem of LNG release and escape in the process of promoting and applying inland LNG clean energy powered ships. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation 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 scale.

[0020] Figure 1 This is a schematic diagram of the structure of a device for controlling LNG release and escape from an LNG powered ship according to the utility model;

[0021] Figure 2 A schematic diagram of the structure of the anti-escape release mechanism in the utility model;

[0022] Figure 3 This is a structural schematic diagram of an LNG gas tank equipped with a adding mechanism in the utility model;

[0023] The serial numbers and corresponding component names in the figure are:

[0024] 1-LNG gas tank, 101-LNG liner, 102-insulating vacuum layer, 2-controller, 3-heater, 6-vacuum pipe, 7-vacuum control valve, 8-vacuum pump, 9-adding mechanism, 91-feeding valve, 92-feeding pipe, 93-feeding hopper, 10-temperature sensor, 11-vacuum pressure sensor, 12-pressure sensor, 14-collecting pipe, 15-first control valve, 16-compressor, 17-second control valve, 18-feeding pipe, 19-safety valve, 20-storage tank, 21-third control valve, 22-pressure gauge, 23-gas supply pipe, 24-fourth control valve, 25-gas guide pipe, 26-fifth control valve, 27-LNG vaporization module, 28-gas supply pipe, 29-pressure regulating valve. DETAILED DESCRIPTION

[0025] In order to enable those skilled in the art to better understand the technical solution in the present application, the technical solution of the present utility model will be clearly and completely described below in conjunction with the drawings and embodiments. Obviously, the described embodiments are only part of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present application.

[0026] Embodiment 1:

[0027] like Figure 1-3 As shown, a device for controlling the release and escape of LNG from an LNG-powered ship according to the present embodiment includes an LNG tank 1, a vacuum pump, a pressure sensor 12, a release and escape prevention mechanism, and a controller 2. The LNG tank 1 is provided with an LNG liner 101 and a heat-insulating vacuum layer 102, the heat-insulating vacuum layer 102 wraps the LNG liner 101, and the heat-insulating vacuum layer 102 is installed with a vacuum pressure sensor 11; the vacuum pump is connected to the heat-insulating vacuum layer 102, and is used to extract the vacuum in the heat-insulating vacuum layer 102; the pressure sensor 12 is installed on the LNG tank 1, and is used to monitor the air pressure of the LNG liner 101; the release and escape mechanism penetrates the heat-insulating vacuum layer 102 and is connected to the LNG liner 101; the vacuum pressure sensor 11, the pressure sensor 12, the vacuum pump, and the release and escape prevention mechanism are all electrically connected to the controller 2.

[0028] The vacuum pressure sensor 11 monitors the vacuum in the heat-insulating vacuum layer 102 in real time, and the upper limit vacuum degree and the lower limit vacuum degree of the heat-insulating vacuum layer 102 can be preset on the controller.

[0029] The vacuum extractor is used to extract the vacuum in the thermal insulation vacuum layer 102, so that the thermal insulation vacuum layer 102 can maintain a good vacuum state, improve the thermal insulation effect of the thermal insulation vacuum layer 102, and effectively block the heat exchange between the LNG liner and the external atmosphere.

[0030] It should be noted that the preset range of the vacuum degree is 0.08Pa to 0.0034Pa.

[0031] It can be understood that the lower limit vacuum value can be set to 0.08Pa, and the upper limit vacuum value can be set to 0.0034Pa.

[0032] Working mode of the utility model:

[0033] How to use the release escape mechanism:

[0034] When the pressure sensor 12 monitors that the gas pressure of the LNG liner 101 rises to a set value, the controller 2 controls the release and anti-escape mechanism to operate, and the LNG liner 101 releases LNG gas to the release and anti-escape mechanism, and the release and anti-escape mechanism collects and stores the leaked LNG gas.

[0035] When the leaked LNG gas makes the gas pressure of the LNG liner 101 less than the set value, the controller 2 controls the release and anti-escape mechanism to stop working, and the LNG liner 101 stops releasing LNG gas to the release and anti-escape mechanism.

[0036] How to use the vacuum parts:

[0037] The vacuum pressure sensor 11 monitors the vacuum in the heat-insulating vacuum layer 102 in real time. When the monitored vacuum is lower than the lower limit vacuum, the controller 2 controls the vacuum pumping component to work, and the vacuum pumping component extracts the vacuum in the heat-insulating vacuum layer 102. When the vacuum in the heat-insulating vacuum layer 102 reaches the upper limit vacuum, the controller controls the vacuum pumping component to stop working. The vacuum in the heat-insulating vacuum layer is maintained within the set range, so that the LNG liner 101 can be well insulated.

[0038] It should be noted that the lower limit vacuum degree and the upper limit vacuum degree are pre-set on the controller to facilitate the monitoring of the vacuum pressure sensor while ensuring that the vacuum of the thermal insulation vacuum layer is within a better vacuum degree range, so that the thermal insulation vacuum layer can play a better role in thermal insulation and heat preservation.

[0039] Embodiment 2:

[0040] Compared with the embodiment 1, the difference is that: a structure of releasing the anti-escape mechanism is provided. Figure 1 and 2 As shown, the release anti-escape mechanism includes a compressor 16 and a storage tank 20. One end of the compressor 16 is connected to the LNG liner 101 through a collecting pipe 14; the other end of the storage tank 20 is connected to the compressor 16 through a guide pipe 18.

[0041] The LNG gas leaked from the LNG liner 101 is sent to the compressor 16, which compresses the LNG gas and sends it to the storage tank 20, which stores the compressed LNG gas. This can prevent the LNG tank from releasing LNG gas to the outside, and overcome the problem of the existing LNG tank releasing LNG gas to the atmosphere.

[0042] The anti-escape mechanism can recover and store the LNG gas leaked from the LNG tank, thereby realizing the recovery of LNG gas, preventing the waste of resources caused by the release of LNG gas, and protecting the surrounding environment from pollution.

[0043] Embodiment 3:

[0044] Compared with the embodiment 2, the difference is that in order to better control the gas flow, a first control valve 15 and a second control valve 17 are additionally installed. Figure 1 and 2 As shown, the first control valve 15 is installed on the collecting pipe 14 to control the conduction and cutoff of the collecting pipe 14. The second control valve 17 is installed on the guide pipe 18 to control the conduction and cutoff of the guide pipe 18. The first control valve 15, the second control valve 17, and the compressor 16 are all electrically connected to the controller 2.

[0045] The controller 2 can control the operation of the first control valve 15 and the second control valve 17. The first control valve 15 and the second control valve 17 can both be electric stop valve structures.

[0046] During use, when the pressure sensor 12 monitors that the gas pressure of the LNG liner 101 rises to a set value, the controller 2 controls the first control valve 15 and the second control valve 17 to open, and the compressor 16 starts working. The collecting pipe 14 and the guide pipe 18 are both connected. The LNG gas in the LNG liner 101 is guided to the compressor 16 through the collecting pipe 14. The compressor 16 compresses the LNG gas entering it and guides it to the storage tank 20 through the guide pipe 18, and the storage tank 20 stores it. When the leaked LNG gas makes the gas pressure of the LNG liner 101 less than the set value, the controller 2 controls the first control valve 15 and the second control valve 17 to close, the compressor 16 stops working, the collecting pipe 14 and the guide pipe 18 are both cut off, and the LNG gas in the LNG liner 101 cannot be guided to the compressor through the collecting pipe.

[0047] Embodiment 4:

[0048] Compared with the embodiment 2 or 3, the difference is that: a method for utilizing the LNG gas in the storage tank is provided, and a gas supply pipe 23, a fourth control valve 24 and a pressure regulating valve 29 are additionally installed. Figure 1 and 2As shown, one end of the air supply pipe 23 is connected to the storage tank 1, and the other end extends outward; the fourth control valve 24 and the pressure regulating valve 29 are installed in the air supply pipe 23 in sequence according to the gas flow direction of the air supply pipe 23, the fourth control valve 24 is used to control the conduction and cutoff of the air supply pipe 23, and the pressure regulating valve 29 is used to adjust the gas pressure output by the air supply pipe 23.

[0049] The fourth control valve 24 may be a stop valve structure.

[0050] How domestic gas works:

[0051] Open the fourth control valve 24, and the LNG gas in the storage tank 20 is guided to the pressure regulating valve 29 through the gas supply pipe 23. The pressure regulating valve 29 adjusts the gas pressure of the LNG gas to 0.03-0.05Mpa, which can be supplied to the living gas pipeline on the LNG-powered ship.

[0052] Embodiment 5:

[0053] Compared with any one of the embodiments 2-4, the difference is that in order to ensure the safe use of the storage tank, a safety valve 19, a third control valve 21 and a pressure gauge 22 are added. Figure 1 and 2 As shown, the safety valve 19 and the third control valve 21 are respectively installed on the storage tank 20 , and the pressure gauge 22 is installed on the third control valve 21 for monitoring the gas pressure of the storage tank 20 .

[0054] The pressure gauge 22 is installed on the storage tank through the third control valve 21. It is convenient to replace the pressure gauge. That is, when the pressure gauge needs to be replaced, the third control valve 21 is closed and the pressure gauge can be replaced. After the replacement is completed, the third control valve is opened, and the replaced pressure gauge can monitor the air pressure of the storage tank.

[0055] The third control valve may be a stop valve structure.

[0056] It should be noted that the LNG gas in the storage tank can be used for domestic use on LNG-powered ships or for the main engine generator of LNG-powered ships. The LNG gas in the storage tank can be consumed, and the gas pressure in the storage tank can be kept lower than the critical pressure of the safety valve, thus avoiding the pressure relief of the safety valve and preventing the LNG gas from being ejected into the atmosphere.

[0057] Embodiment 6:

[0058] Compared with any one of the embodiments 1-5, the difference is that: a structure of a vacuum pump is provided. Figure 1 and 3 As shown, the vacuum pump includes a vacuum pump 8, a vacuum control valve 7 and a vacuum pipe 6. The vacuum pump 8 is connected to the insulating vacuum layer 102 through the vacuum pipe 6, and the vacuum control valve 7 is installed on the vacuum pipe 6. The vacuum pump 8 and the vacuum control valve 7 are both electrically connected to the controller 2.

[0059] The vacuum control valve 7 may be an electric stop valve structure.

[0060] Working method:

[0061] When the vacuum degree monitored by the vacuum pressure sensor 11 in the thermal insulation vacuum layer 102 is less than the lower limit vacuum degree setting value, the controller 2 controls the vacuum pump 8 to work and controls the vacuum control valve 7 to open, and the vacuum pump 8 draws the vacuum in the thermal insulation vacuum layer 102 through the vacuum pipe 6; when the vacuum degree monitored by the vacuum pressure sensor 11 reaches the upper limit vacuum degree setting value, the controller 2 controls the vacuum pump 8 to stop working and controls the vacuum control valve 7 to close.

[0062] Embodiment 7:

[0063] Compared with any one of the embodiments 1-6, the difference is that: a structure for improving the vacuuming efficiency is provided, and a temperature sensor 10 and a heater 3 are additionally installed. Figure 1 and 3 As shown, the temperature sensor 10 is installed on the LNG tank 1 to monitor the temperature of the thermal insulation vacuum layer 102 ; the heater 3 is installed on the thermal insulation vacuum layer 102 ; the temperature sensor 10 and the heater 3 are both electrically connected to the controller 2 .

[0064] like Figure 1 As shown, the heater 3 includes a heating wire, which is installed in the heat-insulating vacuum layer.

[0065] Directions:

[0066] When the LNG tank 101 is empty, the controller 2 controls the heater 3 to work, and the heater 3 heats the insulating vacuum layer 102, so that the water and air in the insulating vacuum layer are heated. When the temperature sensor 10 monitors that the temperature of the insulating vacuum layer reaches the set temperature value (the set temperature value can be 220°C), the controller controls the heater to stop heating and starts the vacuum pumping component at the same time. At this time, the water in the insulating vacuum layer evaporates due to the heat. The vacuum pumping component extracts the vacuum of the insulating vacuum layer, extracts the moisture in the insulating vacuum layer, reduces the moisture content in the insulating vacuum layer, and helps to improve the dryness of the insulating vacuum layer. When the vacuum pressure sensor detects the upper limit vacuum setting value, the controller controls the vacuum pumping component to stop vacuuming.

[0067] The temperature of the heat-insulating vacuum layer cools down naturally, which can further increase the vacuum degree of the heat-insulating vacuum layer.

[0068] Embodiment 8:

[0069] Compared with any one of the embodiments 1-7, the difference is that in order to add the adsorbent into the heat insulating vacuum layer, an adding mechanism 9 is additionally installed. Figure 1 and 3As shown, the adding mechanism 9 is installed on the LNG gas tank 1 and connected to the thermal insulation vacuum layer 102 , and is used to add adsorbent to the thermal insulation vacuum layer 102 .

[0070] Embodiment 9:

[0071] Compared with Example 8, the difference is that a structure of the adding mechanism is provided. Figure 1 and 3 As shown, the adding mechanism 9 includes a material guide pipe 92, a feeding valve 91 and a feeding hopper 93; one end of the material guide pipe 92 passes through the LNG gas tank 1 and is inserted into the vacuum layer 5, and the other end extends outward to be connected to the feeding hopper 93, and at least two feeding valves 91 are installed on the material guide pipe 92, and the feeding valve 91 is used to control the conduction and cutoff of the material guide pipe 92.

[0072] like Figure 1 and 3 As shown, the number of charging valves that can be installed is 2 or 3. Multiple charging valves are installed at intervals on the feed guide pipe. In this embodiment, the number of charging valves installed is selected to be 2.

[0073] The adsorbent may be a mixture of palladium monoxide, molecular sieve, and activated carbon. For example, the adsorbent may be a mixture of palladium monoxide and molecular sieve. Alternatively, the adsorbent may be a mixture of molecular sieve and activated carbon; or the adsorbent may be a mixture of palladium monoxide and activated carbon; or the adsorbent may be a mixture of palladium monoxide, molecular sieve, and activated carbon.

[0074] The adsorbent is used to absorb the air that penetrates into the thermal insulation vacuum layer.

[0075] Working method:

[0076] Put the adsorbent into the hopper 93, then open the feeding valve near the hopper, and the adsorbent falls from the hopper into the pipe between the two feeding valves. When the adsorbent in the hopper falls completely into the guide pipe 92, close the feeding valve near the hopper to block the connection between the guide pipe and the outside atmosphere. Open the feeding valve near the LNG tank 1, and the adsorbent in the guide pipe falls into the insulation vacuum layer, so as to replenish the adsorbent to the insulation vacuum layer.

[0077] Embodiment 10:

[0078] Compared with any one of the embodiments 1-9, the difference is that an air guide pipe 25, a fifth control valve 26, an LNG vaporization module 27 and an air supply pipe 28 are additionally installed. Figure 1 As shown, one end of the air guide pipe 25 is connected to the LNG gas tank, and the other end extends outward to be connected to the LNG vaporization module 27, on which a fifth control valve 26 is installed; the LNG vaporization module 27 is provided with an air supply pipe 28 for delivering LNG gas to the main engine or generator of the LNG-powered ship.

[0079] Application examples:

[0080] Guangxi Xijiang Heavy Industry Co., Ltd. is responsible for building two 5,000-ton LNG-powered bulk carriers for Guiping Zhonghai Transport Co., Ltd. The utility model is applied on the bulk carriers. Since their operation, the vacuum degree of the LNG gas tanks on board has been maintained at more than 95% of that at the factory, achieving zero emission of LNG.

[0081] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A device for controlling the release and escape of LNG from an LNG powered ship, characterized in that: include An LNG gas tank (1), the LNG gas tank (1) being provided with an LNG liner (101) and a heat-insulating vacuum layer (102), the heat-insulating vacuum layer (102) wrapping the LNG liner (101), and the heat-insulating vacuum layer (102) being provided with a vacuum pressure sensor (11); A vacuum pumping component, the vacuum pumping component being connected to the heat-insulating vacuum layer (102) and being used to extract the vacuum in the heat-insulating vacuum layer (102); A pressure sensor (12), the pressure sensor (12) being installed on the LNG gas tank (1) and used to monitor the gas pressure of the LNG liner (101); a release anti-escape mechanism, the release anti-escape mechanism penetrating the heat-insulating vacuum layer (102) and connected to the LNG liner (101); and A controller (2), wherein the vacuum pressure sensor (11), the pressure sensor (12), the vacuum pumping member, and the anti-escape release mechanism are all electrically connected to the controller (2); When the pressure sensor (12) monitors that the gas pressure of the LNG liner (101) rises to a set value, the controller (2) controls the release and escape prevention mechanism to operate, and the LNG liner (101) releases LNG gas to the release and escape prevention mechanism, and the release and escape prevention mechanism collects and stores the leaked LNG gas.

2. The device for controlling LNG release and escape from an LNG powered ship according to claim 1, characterized in that: The release anti-escape mechanism comprises A compressor (16), one end of the compressor (16) being connected to the LNG liner (101) via a collecting pipe (14); and A storage tank (20) is connected to the other end of the compressor (16) via a guide pipe (18).

3. The device for controlling LNG release and escape from an LNG powered ship according to claim 2, characterized in that: It also includes a first control valve (15) and a second control valve (17); The first control valve (15) is installed on the collecting pipe (14) and is used to control the conduction and cutoff of the collecting pipe (14); The second control valve (17) is installed on the guide pipe (18) and is used to control the conduction and cutoff of the guide pipe (18); The first control valve (15), the second control valve (17) and the compressor (16) are all electrically connected to the controller.

4. The device for controlling LNG release and escape from an LNG powered ship according to claim 2, characterized in that: It also includes an air supply pipe (23), a fourth control valve (24) and a pressure regulating valve (29); One end of the air supply pipe (23) is connected to the storage tank (20), and the other end extends outward; The fourth control valve (24) and the pressure regulating valve (29) are installed in sequence on the gas supply pipe (23) according to the gas flow direction of the gas supply pipe (23); the fourth control valve (24) is used to control the conduction and cutoff of the gas supply pipe (23); and the pressure regulating valve (29) is used to adjust the gas pressure output from the gas supply pipe (23).

5. The device for controlling LNG release and escape from an LNG powered ship according to any one of claims 2 to 4, characterized in that: It also includes a safety valve (19), a third control valve (21) and a pressure gauge (22); the safety valve (19) and the third control valve (21) are respectively installed on the storage tank (20); the pressure gauge (22) is installed on the third control valve (21) and is used to monitor the gas pressure of the storage tank (20).

6. The device for controlling LNG release and escape from an LNG powered ship according to claim 1, characterized in that: The vacuum pump comprises a vacuum pump (8), a vacuum control valve (7) and a vacuum pipe (6); the vacuum pump (8) is connected to the heat-insulating vacuum layer (102) via the vacuum pipe (6); the vacuum control valve (7) is installed on the vacuum pipe (6); the vacuum pump (8) and the vacuum control valve (7) are both electrically connected to the controller (2).

7. The device for controlling LNG release and escape from an LNG powered ship according to claim 1, characterized in that: It also includes a temperature sensor (10) and a heater (3); the temperature sensor (10) is installed on the LNG gas tank (1) and is used to monitor the temperature of the thermal insulation vacuum layer (102); the heater (3) is installed on the thermal insulation vacuum layer (102); and the temperature sensor (10) and the heater (3) are both electrically connected to the controller (2).

8. The device for controlling LNG release and escape from an LNG powered ship according to any one of claims 1 to 4, 6 and 7, characterized in that: It also comprises an adding mechanism (9), which is installed on the LNG gas tank (1) and connected to the thermal insulation vacuum layer (102) and is used to add an adsorbent to the thermal insulation vacuum layer (102).

9. The device for controlling LNG release and escape from an LNG powered ship according to claim 8, characterized in that: The adding mechanism (9) comprises a material guide pipe (92), a material adding valve (91) and a material adding hopper (93); one end of the material guide pipe (92) penetrates the LNG gas tank (1) and is inserted into the vacuum layer (5), and the other end extends outwardly to be connected to the material adding hopper (93), and at least two material adding valves (91) are installed on the material guide pipe (92), and the material adding valves (91) are used to control the conduction and cutoff of the material guide pipe (92).

10. The device for controlling LNG release and escape from an LNG powered ship according to claim 8, characterized in that: It also includes an air guide pipe (25), a fifth control valve (26), an LNG vaporization module (27) and an air supply pipe (28); One end of the air guide pipe (25) is connected to the LNG tank, and the other end extends outward to be connected to the LNG vaporization module, and a fifth control valve (26) is installed on the air guide pipe; The LNG vaporization module (27) is provided with a gas delivery pipe (28) for delivering LNG gas to a main engine or a generator of an LNG-powered ship.

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