Liquefied natural gas (LNG) diffusion recovery device for LNG power-driven ship

Abstract

The utility model discloses an LNG (Liquefied Natural Gas) diffused recovery device for an LNG power-driven ship, which comprises an LNG tank, the LNG tank is provided with an LNG liner and a vacuum interlayer, and the vacuum interlayer wraps the LNG liner; the pressure sensor is installed on the LNG tank and used for monitoring the air pressure of the LNG inner container; the diffusion recovery mechanism penetrates through the vacuum interlayer and is connected with the LNG liner; the pressure sensor, the vacuumizing piece and the diffusing and recycling mechanism are all electrically connected with the controller; when the pressure sensor monitors that the air pressure of the LNG inner container rises to a set value, the controller controls the diffusion recovery mechanism to work, meanwhile, the LNG inner container discharges LNG gas to the diffusion recovery mechanism, and the diffusion recovery mechanism collects and stores the discharged LNG gas.

Description

Technical Field

[0001] The utility model relates to LNG recovery equipment, in particular to a LNG recovery device for LNG release 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 found that when the gas pressure in the LNG tank on the LNG-powered ship reaches the upper limit, the LNG tank will release LNG to the outside through the pressure relief valve to reduce the internal gas pressure of the LNG tank. Usually, the release is performed once every 5 to 20 days, resulting in LNG waste. The LNG gas (mainly methane) is released into the atmosphere, causing environmental pollution. Utility Model Content

[0004] The utility model aims to provide a LNG recovery device for LNG power ship to solve 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 LNG release and recovery device for an LNG powered ship comprises an LNG tank, wherein the LNG tank is provided with an LNG liner and a vacuum interlayer, wherein the vacuum interlayer wraps the LNG liner; a pressure sensor, wherein the pressure sensor is installed on the LNG tank and is used to monitor the gas pressure of the LNG liner; a release and recovery mechanism, wherein the release and recovery mechanism passes through the vacuum interlayer and is connected to the LNG liner; and a controller, wherein the pressure sensor and the release and recovery mechanism are both electrically connected to the controller; wherein, when the pressure sensor monitors that the gas pressure of the LNG liner rises to a set value, the controller controls the release and recovery mechanism to work, while the LNG liner releases LNG gas to the release and recovery mechanism, and the release and recovery mechanism collects and stores the released LNG gas.

[0007] Furthermore, the emission and recovery 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 emission and recovery 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 release and recovery 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 from the air supply pipe.

[0010] Furthermore, the release and recovery 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 gas pressure of the storage tank.

[0011] Furthermore, the utility model provides a LNG-powered ship LNG release recovery device, which also includes a vacuum pumping component, which is connected to the vacuum interlayer of the LNG tank and is used to extract the vacuum of the vacuum interlayer.

[0012] Furthermore, the vacuum pump includes a vacuum pump, a vacuum control valve, a vacuum pressure sensor and a vacuum pipe. The vacuum pump is connected to the vacuum interlayer through the vacuum pipe. The vacuum control valve is installed on the vacuum pipe. The vacuum pressure sensor is installed on the LNG gas tank for monitoring the vacuum of the vacuum interlayer. The vacuum pump, vacuum control valve and vacuum pressure sensor are all electrically connected to the controller.

[0013] Furthermore, the LNG recovery device for LNG-powered ships of the utility model further includes a temperature sensor, which is installed on the LNG tank and is used to monitor the temperature of the vacuum interlayer.

[0014] Furthermore, the controller has a touch display screen.

[0015] The present invention has significant improvements over the prior art:

[0016] 1. The utility model has the function of extracting LNG gas from the LNG tank when the gas pressure of the LNG tank rises to the upper limit of the gas pressure, and storing and recovering the extracted LNG gas, so as to avoid the LNG tank from releasing LNG into the atmosphere, which can not only prevent the waste of LNG caused by the release of LNG tank, but also avoid the environmental pollution caused by the release of LNG tank into the atmosphere. That is, when the pressure sensor monitors that the gas pressure of the LNG liner rises to the set value, the controller controls the release and recovery mechanism to work, and the LNG liner releases LNG gas to the release and recovery mechanism, and the release and recovery mechanism collects and stores the leaked LNG gas.

[0017] 2. The utility model monitors the vacuum of the vacuum interlayer in real time through the vacuum pressure sensor, and transmits the vacuum data information obtained by the monitoring to the controller in real time. The upper vacuum limit value and the lower vacuum limit value are pre-set on the controller. When the vacuum degree monitored by the vacuum pressure sensor is lower than the lower vacuum limit value, the controller controls the vacuum pump to work, the vacuum control valve to open, and the vacuum pump extracts the vacuum of the vacuum interlayer through the vacuum pumping pipe. When the vacuum degree monitored by the vacuum pressure sensor reaches the upper vacuum limit value, the controller controls the vacuum pump to stop working and the vacuum control valve to close. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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.

[0019] Figure 1 This is a schematic diagram of the structure of a LNG recovery device for LNG-powered ships according to the utility model;

[0020] Figure 2 A structural schematic diagram of the release and recovery mechanism in the utility model;

[0021] The serial numbers and corresponding component names in the figure are:

[0022] 1-LNG gas tank, 101-LNG liner, 102-vacuum interlayer, 2-controller, 3-heater, 6-vacuum pipe, 7-vacuum control valve, 8-vacuum pump, 10-temperature sensor, 11-vacuum pressure sensor, 12-pressure sensor, 14-collecting pipe, 15-first control valve, 16-compressor, 17-second control valve, 18-guide pipe, 19-safety valve, 20-storage tank, 21-third control valve, 22-pressure gauge, 23-gas supply pipe, 24-fourth control valve, 29-pressure regulating valve. DETAILED DESCRIPTION

[0023] 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.

[0024] Embodiment 1:

[0025] like Figure 1 , 2As shown, a LNG release and recovery device for an LNG powered ship of this embodiment includes an LNG tank 1, a pressure sensor 12, a release and recovery mechanism, and a controller 2. The LNG tank 1 is provided with an LNG liner 101 and a vacuum interlayer 102, and the vacuum interlayer 102 wraps the LNG liner 101; the pressure sensor 12 is installed on the LNG tank 1 to monitor the gas pressure of the LNG liner 101; the release and recovery mechanism penetrates the vacuum interlayer 102 and is connected to the LNG liner 101; the pressure sensor 12 and the release and recovery mechanism are both electrically connected to the controller 2.

[0026] The vacuum interlayer 102 provides thermal insulation to the LNG liner 101 .

[0027] The controller 2 has a touch screen. The controller can display the air pressure data information monitored by the pressure sensor through the touch screen. The air pressure of the LNG liner 101 can be quickly known by checking the touch screen.

[0028] Working mode of the utility model:

[0029] 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 recovery mechanism to operate, and the LNG liner 101 releases LNG gas to the release and recovery mechanism, and the release and recovery mechanism collects and stores the leaked LNG gas.

[0030] 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 recovery mechanism to stop working, and the LNG liner 101 stops releasing the LNG gas to the release and recovery mechanism.

[0031] The utility model monitors the gas pressure of the LNG tank in real time through a pressure sensor. When the gas pressure rises to a set value, a controller controls the release and recovery mechanism to extract the LNG gas in the LNG tank in time, which can not only prevent the LNG tank from releasing the LNG gas to the outside, but also recover and store the extracted LNG gas through the release and recovery mechanism.

[0032] Embodiment 2:

[0033] Compared with embodiment 1, the difference is that a structure of a release and recovery mechanism is provided. Figure 1 and 2 As shown, the release and recovery 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.

[0034] It should be noted that the collecting pipe 14 is connected to the LNG liner 101, and the outer side of the pipe is sealedly connected to the LNG tank at the connection point. For example, the collecting pipe and the LNG tank can be connected by welding.

[0035] 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.

[0036] The release and recovery 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.

[0037] Embodiment 3:

[0038] 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.

[0039] 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.

[0040] 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.

[0041] Embodiment 4:

[0042] 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 2 As 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.

[0043] The fourth control valve 24 may be a stop valve structure.

[0044] How the tank works:

[0045] 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.

[0046] Embodiment 5:

[0047] 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 .

[0048] 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.

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

[0050] 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.

[0051] Embodiment 6:

[0052] Compared with any one of the embodiments 1-5, the difference is that in order to keep the vacuum degree of the vacuum interlayer within a certain range, a vacuum pump is installed. Figure 1As shown, the vacuum extractor is connected to the vacuum interlayer of the LNG gas tank to extract the vacuum from the vacuum interlayer.

[0053] The vacuum extractor is used to extract the vacuum of the vacuum interlayer, so that the vacuum degree of the vacuum interlayer can be maintained within a certain range, thereby enabling the vacuum interlayer to maintain good thermal insulation effect.

[0054] Embodiment 7:

[0055] Compared with Example 6, the difference is that a structure of a vacuum pump is provided. Figure 1 As shown, the vacuum pump includes a vacuum pump 8, a vacuum control valve 7, a vacuum pressure sensor 11 and a vacuum pipe 6. The vacuum pump 8 is connected to the vacuum interlayer 102 through the vacuum pipe 6. The vacuum control valve 7 is installed on the vacuum pipe 6. The vacuum pressure sensor 11 is installed on the LNG gas tank for monitoring the vacuum of the vacuum interlayer. The vacuum pump 8, the vacuum control valve 7 and the vacuum pressure sensor are all electrically connected to the controller 2.

[0056] The vacuum pressure sensor 11 monitors the vacuum in the vacuum interlayer 102 in real time, and the upper limit vacuum degree value and the lower limit vacuum degree value of the vacuum interlayer 102 can be preset on the controller.

[0057] The vacuum pump 8 is used to extract the vacuum in the vacuum interlayer 102, so that the vacuum interlayer 102 can maintain a good vacuum state, improve the thermal insulation effect of the vacuum interlayer 102, and effectively block the heat exchange between the LNG liner and the external atmosphere.

[0058] The vacuum control valve 7 can be an electric stop valve structure.

[0059] Working method:

[0060] When the vacuum degree monitored by the vacuum pressure sensor 11 in the vacuum interlayer 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 extracts the vacuum in the vacuum interlayer 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.

[0061] Embodiment 8:

[0062] Compared with any one of the embodiments 1-7, the difference is that in order to monitor the temperature of the vacuum interlayer, a temperature sensor 10 is additionally installed. Figure 1 As shown, the temperature sensor 10 is installed on the LNG tank 1 to monitor the temperature of the vacuum interlayer 102 , and the temperature sensor 10 is electrically connected to the controller 2 .

[0063] The temperature sensor 10 monitors the temperature data information of the vacuum interlayer and transmits it to the controller 2 in real time. The controller 2 then displays the corresponding temperature data information through the touch display screen. The temperature information of the vacuum interlayer can be quickly obtained by checking the touch display screen.

[0064] Application examples:

[0065] 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 has been applied on the bulk carriers and has achieved zero LNG emission since its operation. Moreover, the vacuum degree of the LNG gas tanks on board has been maintained at more than 95% at the time of leaving the factory.

[0066] 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 LNG recovery device for LNG-powered ships. Features: include An LNG gas tank (1), wherein the LNG gas tank (1) is provided with an LNG liner (101) and a vacuum interlayer (102), wherein the vacuum interlayer (102) wraps the LNG liner (101); 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 and recovery mechanism, the release and recovery mechanism being arranged through the vacuum interlayer (102) and connected to the LNG liner (101); and A controller (2), wherein the pressure sensor (12) and the release and recovery mechanism are both 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 recovery mechanism to operate, and the LNG liner (101) releases LNG gas to the release and recovery mechanism, and the release and recovery mechanism collects and stores the released LNG gas.

2. The LNG recovery device for LNG-powered ships according to claim 1, Features: The release and recovery 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 LNG recovery device for LNG-powered ships according to claim 2, Features: 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 LNG recovery device for LNG-powered ships according to claim 2, Features: 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 LNG recovery device for LNG-powered ships according to any one of claims 2 to 4, Features: 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 LNG recovery device for LNG-powered ships according to claim 1, Features: It also comprises a vacuum extracting component, which is connected to the vacuum interlayer (102) of the LNG gas tank (1) and is used to extract the vacuum of the vacuum interlayer (102).

7. The LNG recovery device for LNG-powered ships according to claim 6, Features: The vacuum pump comprises a vacuum pump (8), a vacuum control valve (7), a vacuum pressure sensor (11) and a vacuum pipe (6); The vacuum pump (8) is connected to the vacuum interlayer (102) via a vacuum pumping pipe (6), and the vacuum control valve (7) is installed on the vacuum pumping pipe (6); The vacuum pressure sensor (11) is installed on the LNG gas tank (1) and is used to monitor the vacuum of the vacuum interlayer (102); The vacuum pump (8), the vacuum control valve (7), and the vacuum pressure sensor (11) are all electrically connected to the controller (2).

8. The LNG recovery device for LNG-powered ships according to claim 1, Features: It also includes a temperature sensor (10), which is installed on the LNG gas tank (1) and is used to monitor the temperature of the vacuum interlayer (102).

9. The LNG recovery device for LNG-powered ships according to claim 1, Features: The controller (2) is provided with a touch display screen.

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