A temperature control component for LNG storage tank

Abstract

The utility model discloses an LNG storage tank temperature control component, comprising an outer storage tank and a refrigeration device, wherein an inner storage tank is coaxially fixedly arranged inside the outer storage tank, and a first pipeline and a second pipeline are respectively provided at the upper and lower parts of one end of the outer storage tank penetrating into the inner storage tank; pressure relief holes are provided at intervals on the top of the inner storage tank along its length direction, and a pressure relief valve is installed in the pressure relief holes; a thermal insulation and pressure relief cavity is formed between the outer storage tank and the inner storage tank; an electromagnetic three-way valve is provided on the first pipeline, which is used to connect the inner storage tank with an external container and the thermal insulation and pressure relief cavity, and an electromagnetic valve is provided on the second pipeline; the refrigeration device is located at the other end of the outer storage tank, and the liquid refrigerant in the refrigeration device is connected with the thermal insulation and pressure relief cavity through the thermal insulation pipeline, so that the liquid refrigerant circulates between the refrigeration device and the thermal insulation and pressure relief cavity, and circulates and cools the thermal insulation and pressure relief cavity and the inner storage tank.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid LNG storage equipment, in particular to a LNG storage tank temperature control component. Background Art

[0002] As energy demand continues to grow, liquefied natural gas (LNG), as a clean and efficient energy source, plays an increasingly important role in the energy structure. However, during the storage of LNG, due to its low temperature, flammable and explosive characteristics, the temperature control requirements for storage tanks are extremely high.

[0003] When the external environment of an existing LNG storage tank rises steadily, the high temperature is transferred to the internal liquefied natural gas through the wall of the LNG storage tank. The liquefied natural gas is vaporized due to the temperature change, causing the gas pressure in the tank to increase. Usually, an external container or a gas pipeline or a pressure relief valve is required to discharge the gas directly to the outside for active pressure relief. The LNG storage tank has poor adaptability. In addition, the existing LNG storage tank has poor thermal insulation effect, resulting in low efficiency of the temperature control component in regulating the internal temperature of the LNG storage tank.

[0004] Therefore, it is necessary to provide a LNG storage tank temperature control component to solve the problems mentioned in the above background technology. Utility Model Content

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solution: a LNG storage tank temperature control assembly, comprising: an outer storage tank and a refrigeration device, wherein an inner storage tank is coaxially fixedly arranged inside the outer storage tank, and the upper and lower parts of one end of the outer storage tank are respectively penetrated into the inner storage tank and provided with a first pipeline and a second pipeline;

[0006] The top of the inner storage tank is provided with pressure relief holes at intervals along the length direction thereof, and a pressure relief valve is installed in the pressure relief hole;

[0007] A temperature-insulating pressure-relieving chamber is formed between the outer storage tank and the inner storage tank, for temporarily storing the gaseous natural gas discharged from the inner storage tank by pressure relief;

[0008] The first pipeline is provided with an electromagnetic three-way valve, two passages of which are used to conduct the first pipeline so that the inner storage tank is connected with the external container, and the third passage of the electromagnetic three-way valve is used to connect the thermal insulation pressure relief chamber and the first pipeline, and the second pipeline is provided with an electromagnetic valve;

[0009] The refrigeration device is located at the other end of the outer storage tank, and the liquid refrigerant medium in the refrigeration device is connected to the thermal insulation and pressure relief chamber through a thermal insulation pipe, so that the liquid refrigerant medium circulates between the refrigeration device and the thermal insulation and pressure relief chamber, circulating and cooling the thermal insulation and pressure relief chamber and the inner storage tank.

[0010] Preferably, a cooling pipe is spirally wound around the outer wall of the inner storage tank, and both ends of the cooling pipe are respectively connected to the liquid inlet pipe and the liquid outlet pipe of the thermal insulation pipe.

[0011] Preferably, the tank walls of the outer storage tank and the inner storage tank each include two protective layers, and a thermal insulation layer is provided between the two protective layers.

[0012] Preferably, the outer circumferential surface of the inner storage tank is provided with temperature conducting holes at spiral intervals, the temperature conducting holes are arranged corresponding to the cooling pipes, and a temperature conducting column is fixedly provided in the temperature conducting holes.

[0013] Preferably, a heat absorbing plate is provided at one end of the temperature conducting column located inside the inner storage tank, and the heat absorbing plate is a cross-shaped plate.

[0014] Preferably, a plurality of buffer connection seats are evenly distributed on the circumference of the inner two ends of the outer storage tank, and the buffer connection seats abut against the outer sides of the two ends of the inner storage tank to buffer the inner storage tank.

[0015] Preferably, the liquid refrigerant is liquid nitrogen.

[0016] Preferably, sensor modules are provided inside the outer storage tank and the inner storage tank, and the sensor modules are used to monitor the temperature, pressure and liquid level inside the inner storage tank and the outer storage tank.

[0017] Compared with the prior art, the utility model provides a LNG storage tank temperature control component, which has the following

[0018] Beneficial effects:

[0019] In the utility model, through the arrangement of the outer storage tank and the inner storage tank, on the one hand, the impact protection capability of the LNG storage tank is improved, and on the other hand, a thermal insulation and pressure relief chamber is formed between the two, and the excess gaseous natural gas is discharged into the thermal insulation and pressure relief chamber for temporary storage through the pressure relief valve, and the internal part of the storage tank is self-adjusted to avoid discharge, thereby improving the self-adaptation capability of the LNG storage tank; at the same time, the gas in the thermal insulation and pressure relief chamber is cooled by the refrigeration device to form a low-temperature and high-pressure gas thermal insulation zone, and the gas thermal insulation zone and the inner and outer storage tanks constitute three thermal insulation protection barriers, thereby enhancing the thermal insulation effect of the LNG storage tank and improving the stability of the liquefied natural gas in the LNG storage tank.

[0020] And through the spirally spaced temperature conducting columns and heat absorbing plates, the internal storage tank is quickly cooled down to improve the temperature control efficiency inside the storage tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of a temperature control component for an LNG storage tank;

[0022] Figure 2This is a schematic diagram of the main cross-sectional structure of a temperature control component for an LNG storage tank;

[0023] Figure 3 A temperature control component for LNG storage tanks Figure 2 The enlarged structural diagram at A in the middle;

[0024] In the figure: 1. External storage tank; 2. Internal storage tank; 3. Refrigeration device; 4. Insulation pipe; 5. First pipe; 6. Second pipe; 7. Cooling pipe; 8. Insulation pressure relief chamber; 9. Buffer connection seat; 10. Solenoid three-way valve; 11. Pressure relief valve; 12. Protective layer; 13. Insulation layer; 14. Temperature conduction column; 15. Heat absorption plate; 16. Sensor module. DETAILED DESCRIPTION

[0025] See also Figure 1-3 The utility model provides an LNG storage tank temperature control assembly, comprising: an outer storage tank 1 and a refrigeration device 3, wherein an inner storage tank 2 is coaxially fixedly arranged inside the outer storage tank 1, and a first pipeline 5 and a second pipeline 6 are respectively arranged at the upper and lower parts of one end of the outer storage tank 1 penetrating into the inner storage tank 2;

[0026] The top of the inner storage tank 2 is provided with pressure relief holes spaced apart along the length direction thereof, and a pressure relief valve 11 is installed in the pressure relief hole;

[0027] A temperature-insulating pressure-relieving chamber 8 is formed between the outer storage tank 1 and the inner storage tank 2, for temporarily storing the gaseous natural gas discharged from the inner storage tank 2 by pressure relief;

[0028] The first pipeline 5 is provided with an electromagnetic three-way valve 10, two passages of which are used to conduct the first pipeline 5 so that the inner storage tank 2 is connected with the external container, and the third passage of the electromagnetic three-way valve 10 is used to connect the thermal insulation pressure relief chamber 8 and the first pipeline 5, and the second pipeline 6 is provided with an electromagnetic valve;

[0029] The refrigeration device 3 is located at the other end of the external storage tank 1, and the liquid refrigerant in the refrigeration device 3 is connected to the thermal insulation and pressure relief chamber 8 through the thermal insulation pipe 4, so that the liquid refrigerant circulates between the refrigeration device 3 and the thermal insulation and pressure relief chamber 8, and circulates and cools the thermal insulation and pressure relief chamber 8 and the internal storage tank 2.

[0030] The first pipeline 5 is used for inputting or outputting gaseous natural gas to or from the internal storage tank 2 , and the second pipeline 6 is used for inputting or outputting liquefied natural gas to or from the internal storage tank 2 .

[0031] When in use, liquefied natural gas is stored in the inner storage tank 2. When the temperature in the inner storage tank 2 rises due to the external high temperature, causing the pressure of the liquefied natural gas vaporization tank to rise to the threshold of the pressure relief valve 11, the pressure relief valve 11 releases the pressure to discharge the excess gaseous natural gas into the thermal insulation and pressure relief chamber 8. At the same time, the setting of the three-way solenoid valve can give priority to the natural gas in the thermal insulation and pressure relief chamber 8 when supplying natural gas to external containers, thereby improving the adaptive ability of the LNG storage tank to cope with internal pressure increases.

[0032] It should be noted that by discharging excessive gaseous natural gas into the insulation and pressure relief chamber 8, the internal gas pressure and gas density are increased, and then the refrigeration device 3 cools the gas in the insulation and pressure relief chamber 8 to form an insulation zone composed of low-temperature and high-pressure gas. The insulation zone, the outer storage tank 1 and the inner storage tank 2 together form three insulation protection barriers for liquefied natural gas, reducing the impact of external temperature changes on the liquefied natural gas in the inner storage tank 2 and improving the stability of the liquefied natural gas in the storage tank. In addition, the setting of the inner and outer storage tanks greatly increases the impact protection capability of the LNG storage tank.

[0033] In this embodiment, a cooling pipe 7 is spirally wound around the outer wall of the inner storage tank 2 , and two ends of the cooling pipe 7 are respectively connected to the liquid inlet pipe and the liquid outlet pipe of the temperature-insulating pipe 4 .

[0034] Specifically, the cooling pipe 7 is made of stainless steel, copper alloy, aluminum alloy, etc., so that the liquid refrigerant medium can cool the inner storage tank 2 through the cooling pipe 7 .

[0035] In this embodiment, the tank walls of the outer storage tank 1 and the inner storage tank 2 each include two protective layers 12 , and a thermal insulation layer 13 is provided between the two protective layers 12 .

[0036] Specifically, the protective layer 12 is made of steel, and the thermal insulation layer 13 is made of foam glass, foam polyethylene, rock wool, etc.

[0037] In this embodiment, the outer surface of the inner storage tank 2 is provided with temperature conducting holes at spiral intervals, the temperature conducting holes are arranged corresponding to the cooling pipe 7, and a temperature conducting column 14 is fixed in the temperature conducting hole. The temperature conducting column 14 is used to realize rapid heat exchange between the inner storage tank 2 and the cooling pipe 7, so as to facilitate rapid temperature adjustment of the inner storage tank 2.

[0038] In this embodiment, the heat conducting column 14 is provided with a heat absorbing plate 15 at one end inside the inner storage tank 2, and the heat absorbing plate 15 is a cross-shaped plate. The cross-shaped plate is provided to increase the heat exchange area and improve the cooling efficiency.

[0039] In this embodiment, a plurality of buffer connection seats 9 are evenly distributed on the circumference of both ends of the inner side of the outer storage tank 1 , and the buffer connection seats 9 abut against the outer sides of both ends of the inner storage tank 2 to buffer and fix the inner storage tank 2 .

[0040] In this embodiment, the liquid refrigerant is liquid nitrogen.

[0041] In this embodiment, a sensor module 16 is provided inside the outer storage tank 1 and the inner storage tank 2. The sensor module 16 includes at least a temperature sensor, a pressure sensor and a liquid level sensor, which are used to monitor the temperature, pressure and liquid level inside the inner storage tank 2 and the outer storage tank 1.

[0042] It should be explained that, by providing the sensor module 16, it is convenient to monitor the temperature, air pressure, liquid level and other parameters in the storage tank in real time, thereby improving the accuracy and efficiency of adjusting the state of the storage tank.

[0043] During specific implementation, liquefied natural gas is stored in an inner storage tank. When the temperature inside the inner storage tank rises due to external high temperature, causing the pressure of the liquefied natural gas vaporization tank to rise to the threshold of the pressure relief valve, the pressure relief valve releases the pressure to discharge excess gaseous natural gas into the thermal insulation and pressure relief chamber. The internal part of the storage tank adjusts itself to avoid discharge, thereby improving the adaptability of the LNG storage tank. At the same time, the refrigeration device cools the gas in the thermal insulation and pressure relief chamber to form a low-temperature, high-pressure gas insulation zone. The gas insulation zone and the inner and outer tanks form three thermal insulation protection barriers, which enhance the insulation effect of the LNG storage tank and improve the stability of the liquefied natural gas in the tank.

[0044] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An LNG storage tank temperature control assembly, comprising: An external storage tank (1) and a refrigeration device (3), characterized in that an internal storage tank (2) is coaxially spaced and fixed inside the external storage tank (1), and a first pipe (5) and a second pipe (6) are respectively provided at the upper and lower parts of one end of the external storage tank (1) and penetrate into the internal storage tank (2); The top of the inner storage tank (2) is provided with pressure relief holes spaced apart along its length, and a pressure relief valve (11) is installed in the pressure relief hole; A temperature-insulating pressure-relieving chamber (8) is formed between the outer storage tank (1) and the inner storage tank (2) for temporarily storing gaseous natural gas discharged from the inner storage tank (2) after pressure relief; The first pipeline (5) is provided with an electromagnetic three-way valve (10), two passages of the electromagnetic three-way valve (10) are used to conduct the first pipeline (5) so that the internal storage tank (2) is connected to the external container, and the third passage of the electromagnetic three-way valve (10) is used to connect the thermal insulation pressure relief chamber (8) and the first pipeline (5), and the second pipeline (6) is provided with an electromagnetic valve; The refrigeration device (3) is located at the other end of the outer storage tank (1), and the liquid refrigerant in the refrigeration device (3) is connected to the thermal insulation and pressure relief chamber (8) via the thermal insulation pipe (4), so that the liquid refrigerant circulates between the refrigeration device (3) and the thermal insulation and pressure relief chamber (8), thereby circulating and cooling the thermal insulation and pressure relief chamber (8) and the inner storage tank (2).

2. The LNG storage tank temperature control assembly according to claim 1, characterized in that: A cooling pipe (7) is spirally wound around the outer wall of the inner storage tank (2), and two ends of the cooling pipe (7) are respectively connected to the liquid inlet pipe and the liquid outlet pipe of the temperature-insulating pipe (4).

3. The LNG storage tank temperature control assembly according to claim 1, characterized in that: The tank walls of the outer storage tank (1) and the inner storage tank (2) both include two protective layers (12), and a thermal insulation layer (13) is provided between the two protective layers (12).

4. The LNG storage tank temperature control assembly according to claim 2, characterized in that: The outer peripheral surface of the inner storage tank (2) is provided with temperature conducting holes which are spirally spaced and penetrated therethrough. The temperature conducting holes are arranged corresponding to the cooling pipes (7), and temperature conducting columns (14) are fixedly arranged in the temperature conducting holes.

5. The LNG storage tank temperature control assembly according to claim 4, characterized in that: The temperature conducting column (14) is located at one end of the inner side of the inner storage tank (2) and is provided with a heat absorbing plate (15), and the heat absorbing plate (15) is a cross-shaped plate.

6. The LNG storage tank temperature control assembly according to claim 1, characterized in that: A plurality of buffer connection seats (9) are evenly arranged on the circumference of the inner two ends of the outer storage tank (1), and the buffer connection seats (9) abut against the outer sides of the two ends of the inner storage tank (2) to provide buffering for the inner storage tank (2).

7. The LNG storage tank temperature control assembly according to claim 1, characterized in that: The liquid refrigeration medium is liquid nitrogen.

8. The LNG storage tank temperature control assembly according to claim 1, characterized in that: The outer storage tank (1) and the inner storage tank (2) are both provided with sensor modules (16), and the sensor modules (16) are used to monitor the temperature, pressure and liquid level in the inner storage tank and the outer storage tank.

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