A cryogenic storage tank for reducing cooling loss of liquefied natural gas

Abstract

This utility model discloses a cryogenic storage tank for reducing cold loss of liquefied natural gas, including a support frame, a tank body structure, and an adjustment mechanism. The tank body structure is located at the front end of the support frame and includes an outer tank shell, a middle tank shell, and an inner tank shell arranged sequentially from the outside to the inside. A first sealing interlayer is formed between the outer tank shell and the middle tank shell, and a second sealing interlayer is formed between the middle tank shell and the inner tank shell. The first and second sealing interlayers are used to form a vacuum layer and an inert gas layer, respectively. The adjustment mechanism is located at the rear end of the support frame and includes a gas storage tank and an outer shell. By incorporating the adjustment mechanism, which works in conjunction with a pressure sensor and in collaboration with a vacuum pump, a gas pump, and multiple solenoid valves, the cryogenic storage tank of this utility model can automatically adjust the gas pressure in the vacuum layer and the inert gas layer, thereby ensuring that the internal environment is always maintained in an optimal state, thus minimizing cold loss.

Description

Technical Field

[0001] This utility model relates to the field of natural gas storage tank technology, and in particular to a cryogenic storage tank for liquefied natural gas to reduce cooling loss. Background Technology

[0002] Liquefied natural gas (LNG) cryogenic storage tanks are special containers designed to store liquefied natural gas. They are typically kept in a liquid state at extremely low temperatures to ensure the high density of the natural gas and facilitate its transportation and storage. LNG is produced by cooling natural gas to approximately -162°C, transforming gaseous natural gas into a liquid state, thereby significantly reducing its volume and facilitating storage and transportation.

[0003] However, most traditional cryogenic liquefied natural gas storage tanks typically rely on a single insulation layer for heat insulation, which is difficult to completely prevent external heat conduction and convection, resulting in a large loss of cold energy, and they cannot automatically adjust the insulation structure according to demand.

[0004] Therefore, those skilled in the art have provided a cryogenic storage tank for liquefied natural gas to reduce cooling loss, in order to solve the problems mentioned in the background art. Utility Model Content

[0005] The main objective of this invention is to provide a cryogenic storage tank for liquefied natural gas that reduces cooling loss, thereby addressing the aforementioned shortcomings in the existing technology.

[0006] To achieve the above objectives, the present invention provides the following technical solution.

[0007] Some embodiments of this utility model provide a cryogenic storage tank for reducing cold loss of liquefied natural gas, including a support frame, a tank body structure, and an adjustment mechanism, wherein the tank body structure and the adjustment mechanism are fixedly connected; wherein, the tank body structure is disposed at the front end of the support frame and includes an outer tank shell, a middle tank shell, and an inner tank shell arranged sequentially from the outside to the inside, a first sealing interlayer is formed between the outer tank shell and the middle tank shell, and a second sealing interlayer is formed between the middle tank shell and the inner tank shell, wherein the first sealing interlayer and the second sealing interlayer are respectively used to form a vacuum layer and an inert gas layer;

[0008] The adjustment mechanism is located at the rear end of the support frame and includes a gas storage tank and a shell. A first gas supply pipe is fixedly connected to the outer wall of the rear end of the gas storage tank. A control cabinet is fixedly connected to the middle of the outer wall of the rear end of the shell. A first chamber is opened at the upper end of the shell. A first air inlet pipe is fixedly connected to the middle of the inner wall of the front end of the first chamber. An air pump is fixedly connected to the front end of the outer wall of the first air inlet pipe. A first pressure sensor is fixedly connected to the other side of the inner wall of the front end of the first chamber. A second chamber is opened at the lower end of the shell. A second air inlet pipe is fixedly connected to the middle of the inner wall of the front end of the second chamber. A vacuum pump is fixedly connected to the front end of the outer wall of the second air inlet pipe. A second pressure sensor is fixedly connected to the other side of the inner wall of the front end of the second chamber.

[0009] The first sealing layer is connected to the vacuum pump via the second air inlet pipe, and the second sealing layer is connected to the air pump and the air storage tank via the first air inlet pipe.

[0010] In one embodiment, the inner wall of the outer shell is fixedly connected to a plurality of first connecting blocks, the end of the first connecting block away from the outer shell is fixedly connected to a middle shell, the inner wall of the middle shell is fixedly connected to a plurality of second connecting blocks, and the end of the second connecting block away from the middle shell is fixedly connected to an inner shell.

[0011] In one embodiment, the outer shell is fixedly connected to the front end of the inner wall of the support frame, and the outer shell is fixedly connected to the outer shell.

[0012] In one embodiment, pressure gauges are fixedly connected to the outer walls of the outer shell, middle shell, and inner shell, and conveying pipes are fixedly connected to both sides of the outer wall of the inner shell.

[0013] In one embodiment, the gas storage tank is fixedly connected to the rear part of the upper end of the outer wall of the support frame, and a connecting pipe is provided on the outer wall of the rear end of the first gas supply pipe. The end of the connecting pipe away from the first gas supply pipe is fixedly connected to the first air inlet pipe.

[0014] In one embodiment, a first solenoid valve is fixedly connected to the rear end of the outer wall of the first intake pipe, and a third solenoid valve is fixedly connected to the rear end of the outer wall of the second intake pipe.

[0015] In one embodiment, a second gas supply pipe is fixedly connected to one side of the inner wall at the front end of the first chamber, and a second solenoid valve is fixedly connected to the middle of the outer wall of the second gas supply pipe.

[0016] In one embodiment, a third gas supply pipe is fixedly connected to one side of the inner wall at the front end of the second chamber, and a fourth solenoid valve is fixedly connected to the middle of the outer wall of the third gas supply pipe.

[0017] In one embodiment, the control cabinet is equipped with a battery, an electronic component module, and a current converter. Multiple solar panels are fixedly connected to the front end of the upper part of the outer wall of the support frame. The solar panels are electrically connected to the battery via the current converter. The battery is electrically connected to at least one electrical device in the cryogenic storage tank.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] 1. The cryogenic storage tank of this utility model has three tank shells inside the tank body, thereby creating two sealed spaces inside the tank. Under the action of a vacuum pump and an air pump, a vacuum layer is generated in the space on the outer side, and an inert gas layer is generated in the inner layer by transporting inert gas. The vacuum layer can improve the thermal insulation performance of the storage tank, thereby significantly reducing the loss of cold energy and achieving the effect of passive thermal insulation. The inert gas layer can maintain a stable internal environment of the tank and slow down the temperature change inside the tank, thereby improving the insulation efficiency of the cryogenic storage tank and reducing the loss of low-temperature cold energy.

[0020] 2. The cryogenic storage tank of this utility model is equipped with an adjustment mechanism. Under the detection of the pressure sensor, the vacuum pump and the air pump, together with multiple solenoid valves, can automatically adjust the air pressure in the vacuum layer and the inert gas layer, thereby ensuring that the internal environment is always kept in the best state, and thus minimizing the loss of cold energy. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a cryogenic storage tank in one embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the outer shell structure of a cryogenic storage tank according to one embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the adjustment mechanism of a cryogenic storage tank in one embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the outer shell structure of a cryogenic storage tank proposed in this utility model;

[0025] Figure 5 This is a cross-sectional view of the outer shell of a cryogenic storage tank proposed in this utility model;

[0026] Figure 6 This is a schematic diagram of the air inlet pipe structure of a cryogenic storage tank proposed in this utility model;

[0027] Figure 7 This is a schematic diagram of the second gas pipeline structure of a cryogenic storage tank proposed in this utility model;

[0028] Figure 8This is a schematic diagram of the pressure sensor structure for a cryogenic storage tank proposed in this utility model.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Support frame;

[0031] 2. Tank structure; 201. Outer tank shell; 202. First connecting block; 203. Middle tank shell; 204. Second connecting block; 205. Inner tank shell; 206. Pressure gauge; 207. Delivery pipe;

[0032] 3. Adjustment mechanism; 301. Gas storage tank; 302. First gas supply pipe; 303. Connecting pipe; 304. Housing; 305. Control cabinet; 306. First chamber; 307. First air inlet pipe; 308. First solenoid valve; 309. Air pump; 3010. Second gas supply pipe; 3011. Second solenoid valve; 3012. First pressure sensor; 3013. Second chamber; 3014. Second air inlet pipe; 3015. Third solenoid valve; 3016. Vacuum pump; 3017. Third gas supply pipe; 3018. Fourth solenoid valve; 3019. Second pressure sensor; 3020. Battery; 3021. Electronic component module; 3022. Current converter;

[0033] 4. Solar panels. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0035] Reference Figure 1 , Figure 2 and Figure 3 The cryogenic storage tank for reducing cold loss of liquefied natural gas provided in this embodiment includes a support frame 1, a tank body 2, and an adjustment mechanism 3.

[0036] The tank body mechanism 2 is located at the front end of the support frame 1. It includes an outer tank shell 201, a middle tank shell 203 and an inner tank shell 205 arranged sequentially from the outside to the inside. A first sealing interlayer is formed between the outer tank shell 201 and the middle tank shell 203, and a second sealing interlayer is formed between the middle tank shell 203 and the inner tank shell 205. The first sealing interlayer and the second sealing interlayer are used to form a vacuum layer and an inert gas layer, respectively.

[0037] The inner wall of the outer shell 201 is fixedly connected to a plurality of first connecting blocks 202. The end of the first connecting block 202 away from the outer shell 201 is fixedly connected to the middle shell 203. The inner wall of the middle shell 203 is fixedly connected to a plurality of second connecting blocks 204. The end of the second connecting block 204 away from the middle shell 203 is fixedly connected to the inner shell 205.

[0038] The tank mechanism 2 and the adjustment mechanism 3 are fixedly connected. The adjustment mechanism 3 is located at the rear end of the support frame 1 and includes a gas storage tank 301 and a shell 304. A first gas supply pipe 302 is fixedly connected to the outer wall of the rear end of the gas storage tank 301. A control cabinet 305 is fixedly connected to the middle of the outer wall of the rear end of the shell 304. A first chamber 306 is opened at the upper end of the shell 304. A first air inlet pipe 307 is fixedly connected to the middle of the inner wall of the front end of the first chamber 306. An air pump 309 is fixedly connected to the front end of the outer wall of the first air inlet pipe 307. A first pressure sensor 3012 is fixedly connected to the other side of the inner wall of the front end of the first chamber 306. A second chamber 3013 is opened at the lower end of the shell 304. A second air inlet pipe 3014 is fixedly connected to the middle of the inner wall of the front end of the second chamber 3013. A vacuum pump 3016 is fixedly connected to the front end of the outer wall of the 14th chamber, and a second pressure sensor 3019 is fixedly connected to the other side of the inner wall of the front end of the second chamber 3013. The first air inlet pipe 307 passes through the outer shell 201 and the middle shell 203 and communicates with the second sealing layer. The air pump 309 is connected to the second sealing layer through the first air inlet pipe 307. The second air inlet pipe 3014 passes through the outer shell 201 and communicates with the first sealing layer. The vacuum pump 3016 is connected to the second sealing layer through the second air inlet pipe 3014. The cryogenic storage tank is equipped with an adjustment mechanism 3. Under the detection of the pressure sensor, the vacuum pump 3016 and the air pump 309, together with multiple solenoid valves, can automatically adjust the air pressure in the vacuum layer and the inert gas layer, thereby ensuring that the internal environment is always kept in the best state, and thus minimizing the loss of cold energy.

[0039] Reference Figure 4 and Figure 5 The outer shell 201 is fixedly connected to the front end of the inner wall of the support frame 1. The outer shell 201 is fixedly connected to the outer shell 304. Pressure gauges 206 are fixedly connected to the outer walls of the front ends of the outer shell 201, the middle shell 203 and the inner shell 205. Delivery pipes 207 are fixedly connected to both sides of the outer wall of the front end of the inner shell 205. Thus, multiple pressure gauges 206 can detect the pressure inside the outer shell 201, the middle shell 203 and the inner shell 205. Delivery pipes 207 can transport and discharge cryogenic liquid inside the inner shell 205.

[0040] Reference Figure 2 , Figure 3 and Figure 4The gas storage tank 301 is fixedly connected to the rear part of the upper part of the outer wall of the support frame 1. A connecting pipe 303 is provided on the outer wall of the rear end of the first gas supply pipe 302. The end of the connecting pipe 303 away from the first gas supply pipe 302 is fixedly connected to the first air inlet pipe 307, so that the inert gas in the gas storage tank 301 can be guided into the tank body. A first solenoid valve 308 is fixedly connected to the rear end of the outer wall of the first air inlet pipe 307, and a third solenoid valve 3015 is fixedly connected to the rear end of the outer wall of the second air inlet pipe 3014, so that the first solenoid valve 308 and the third solenoid valve 3015 can reduce the possibility of gas leakage of the air pump 309 and the vacuum pump 3016.

[0041] Reference Figure 2 , Figure 3 and 4 A second gas supply pipe 3010 is fixedly connected to one side of the inner wall of the front end of the first chamber 306. A second solenoid valve 3011 is fixedly connected to the middle of the outer wall of the second gas supply pipe 3010, so that the second solenoid valve 3011 can release the gas pressure of the inert gas layer in the tank by automatically opening or closing the second gas supply pipe 3010. A third gas supply pipe 3017 is fixedly connected to one side of the inner wall of the front end of the second chamber 3013. A fourth solenoid valve 3018 is fixedly connected to the middle of the outer wall of the third gas supply pipe 3017, so that the fourth solenoid valve 3018 can automatically open and close and release the gas pressure of the vacuum layer in the tank through the third gas supply pipe 3017. Multiple solar panels 4 are fixedly connected to the front end of the upper part of the outer wall of the support frame 1, so that the solar panels 4 can collect solar energy and store it through the current converter 3022 and the battery 3020 in the control cabinet 305. The battery 3020 can supply power to electrical equipment such as vacuum pump 3016, air pump 309, and solenoid valve.

[0042] When using this cryogenic storage tank, inert gas (nitrogen) can first be injected into the storage tank 301 to preset and adjust the electronic component module 3021 (CJ2M type PLC controller or STM32 type high-performance microcontroller) in the control cabinet 305. When the first pressure sensor 3012 and the second pressure sensor 3019 (sensors of the Kulite series) detect that the pressure in the two cavities between the outer tank shell 201, the middle tank shell 203 and the inner tank shell 205 exceeds the preset value, the solenoid valve on the gas supply pipe (such as the SMC solenoid valve) is activated to release and adjust the gas pressure. When the pressure is lower than the preset value, the vacuum pump 3016 (such as the E2M series vacuum pump) and the air pump 309 (such as the RV series air pump) are activated. The solenoid valve on the air inlet pipe is activated. The vacuum pump 3016 draws and adjusts the gas in the cavity, and the air pump 309 guides the inert gas in the storage tank 301 into the cavity to complete the adjustment or replenishment of the gas pressure.

[0043] In summary, this embodiment creates two sealed spaces within the cryogenic storage tank by setting up three tank shells. Under the action of vacuum pump 3016 and air pump 309, a vacuum layer is generated in the outer space, while an inert gas layer is generated in the inner layer by transporting inert gas. The vacuum layer can improve the insulation performance of the storage tank, thereby significantly reducing the loss of cold energy and achieving a passive insulation effect. The inert gas layer can maintain a stable internal environment of the tank and slow down the temperature change inside the tank, thereby effectively improving the insulation efficiency of the cryogenic storage tank and significantly reducing the loss of cryogenic cold energy.

[0044] In addition, considering the fire and explosion prevention requirements of natural gas storage tanks, the solenoid valves in this embodiment are all explosion-proof solenoid valves, and other electrical equipment or electrical components that may generate electric sparks are also sealed and encapsulated with insulating materials or grounded designs commonly used in the field.

[0045] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cryogenic storage tank for liquefied natural gas to reduce loss of cold energy, characterized by, The device includes a support frame, a tank body mechanism, and an adjustment mechanism, wherein the tank body mechanism and the adjustment mechanism are fixedly connected; wherein, the tank body mechanism is located at the front end of the support frame and includes an outer tank shell, a middle tank shell, and an inner tank shell arranged sequentially from the outside to the inside, wherein a first sealing interlayer is formed between the outer tank shell and the middle tank shell, and a second sealing interlayer is formed between the middle tank shell and the inner tank shell, wherein the first sealing interlayer and the second sealing interlayer are respectively used to form a vacuum layer and an inert gas layer; The adjustment mechanism is located at the rear end of the support frame and includes a gas storage tank and a shell. A first gas supply pipe is fixedly connected to the outer wall of the rear end of the gas storage tank. A control cabinet is fixedly connected to the middle of the outer wall of the rear end of the shell. A first chamber is opened at the upper end of the shell. A first air inlet pipe is fixedly connected to the middle of the inner wall of the front end of the first chamber. An air pump is fixedly connected to the front end of the outer wall of the first air inlet pipe. A first pressure sensor is fixedly connected to the other side of the inner wall of the front end of the first chamber. A second chamber is opened at the lower end of the shell. A second air inlet pipe is fixedly connected to the middle of the inner wall of the front end of the second chamber. A vacuum pump is fixedly connected to the front end of the outer wall of the second air inlet pipe. A second pressure sensor is fixedly connected to the other side of the inner wall of the front end of the second chamber. The first sealing layer is connected to the vacuum pump via the second air inlet pipe, and the second sealing layer is connected to the air pump and the air storage tank via the first air inlet pipe.

2. The low-temperature storage tank for liquefied natural gas to reduce loss of cold energy according to claim 1, characterized in that: The inner wall of the outer shell is fixedly connected with a plurality of first connecting blocks, the end of the first connecting block away from the outer shell being fixedly connected to the middle shell, and the inner wall of the middle shell is fixedly connected with a plurality of second connecting blocks, the end of the second connecting block away from the middle shell being fixedly connected to the inner shell.

3. The low-temperature storage tank for liquefied natural gas to reduce loss of cold energy according to claim 1, characterized in that: The outer shell is fixedly connected to the front end of the inner wall of the support frame, and the outer shell is fixedly connected to the outer shell.

4. The low-temperature storage tank for liquefied natural gas to reduce loss of cold energy according to claim 1, characterized in that: Pressure gauges are fixedly connected to the outer walls of the outer, middle, and inner tank shells, and conveying pipes are fixedly connected to both sides of the outer wall of the inner tank shell.

5. The low-temperature storage tank for liquefied natural gas to reduce loss of cold energy according to claim 1, characterized in that: The gas storage tank is fixedly connected to the rear part of the upper end of the outer wall of the support frame. A connecting pipe is provided on the outer wall of the rear end of the first gas supply pipe. The end of the connecting pipe away from the first gas supply pipe is fixedly connected to the first air inlet pipe.

6. The low-temperature storage tank for liquefied natural gas to reduce loss of cold energy according to claim 1, characterized in that: A first solenoid valve is fixedly connected to the rear end of the outer wall of the first intake pipe, and a third solenoid valve is fixedly connected to the rear end of the outer wall of the second intake pipe.

7. A cryogenic storage tank for reducing cooling loss of liquefied natural gas according to claim 1, characterized in that: A second gas supply pipe is fixedly connected to one side of the inner wall at the front end of the first chamber, and a second solenoid valve is fixedly connected to the middle of the outer wall of the second gas supply pipe.

8. A cryogenic storage tank for reducing cooling loss of liquefied natural gas according to claim 1, characterized in that: A third gas supply pipe is fixedly connected to one side of the inner wall at the front end of the second chamber, and a fourth solenoid valve is fixedly connected to the middle of the outer wall of the third gas supply pipe.

9. A cryogenic storage tank for reducing cooling loss of liquefied natural gas according to claim 1, characterized in that: The control cabinet is equipped with a battery, electronic component modules and a current converter. Multiple solar panels are fixedly connected to the front end of the upper part of the outer wall of the support frame. The solar panels are electrically connected to the battery via the current converter. The battery is electrically connected to at least one electrical device in the cryogenic storage tank.

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