Liquefied natural gas storage tank with thermal insulation function

Abstract

The application provides a liquefied natural gas storage tank with heat preservation function, comprising: a liquefied natural gas storage tank body, the liquefied natural gas storage tank body comprising a first shell, a second shell and at least one third shell; the first shell forms a first space for containing liquefied natural gas, a second space is formed between the first shell and the second shell, the at least one third shell is arranged in the second space and is used for separating the second space into at least two third spaces, and the plurality of third spaces are respectively used for vacuumizing or filling inert gas; an air inlet pipe, one end of the air inlet pipe sequentially penetrates the plurality of third spaces and communicates with the first space, and is used for supplying liquefied natural gas into the first space; and an air outlet pipe, one end of the air outlet pipe sequentially penetrates the plurality of third spaces and communicates with the first space, and is used for discharging the liquefied natural gas in the first space. The application improves the heat preservation performance and the anti-seismic performance of the liquefied natural gas storage tank body.

Description

Technical Field

[0001] This application relates to the field of liquefied natural gas storage technology, and in particular to a liquefied natural gas storage tank with heat preservation function. Background Technology

[0002] Liquefied Natural Gas (LNG) is a liquefied form of natural gas, primarily composed of methane, and is widely recognized as the cleanest fossil fuel on Earth. It is colorless, odorless, non-toxic, and non-corrosive, with a volume approximately 1 / 625th that of the same amount of gaseous natural gas, and a mass only about 45% that of the same volume of water. LNG is typically stored in LNG storage tanks, specifically atmospheric pressure tanks, mother-daughter tanks under pressurization, and vacuum powder tanks under pressurization. The choice of storage method depends primarily on the storage capacity. Large LNG storage tanks have capacities exceeding 40,000 cubic meters.

[0003] Currently, existing liquefied natural gas (LNG) storage tanks consist of an inner tank and an outer tank, with insulation material filling the space between them to keep the LNG inside the tank warm. However, this insulation material is prone to becoming brittle and shrinking at low temperatures, leading to a cold bridge effect and affecting the insulation performance. Furthermore, when the LNG tank is subjected to vibration, the insulation material between the outer and inner walls can easily cause localized stress concentration in the tank wall, reducing the tank's seismic resistance. Therefore, this application proposes a LNG storage tank with insulation functionality. Utility Model Content

[0004] This application provides a liquefied natural gas storage tank with heat preservation function to solve the technical problems described in the background art above.

[0005] To solve the above-mentioned technical problems, this application adopts the following technical solution:

[0006] This application provides a liquefied natural gas storage tank with thermal insulation function, including:

[0007] The liquefied natural gas (LNG) storage tank body includes a first shell, a second shell, and at least one third shell; the first shell forms a first space for containing LNG, a second space is formed between the first shell and the second shell, and at least one third shell is disposed in the second space and is used to divide the second space into at least two third spaces, and the multiple third spaces are respectively used for vacuuming or filling with inert gas;

[0008] An air intake pipe, one end of which passes through a plurality of the third spaces and communicates with the first space, for allowing the liquefied natural gas to enter the first space;

[0009] A gas outlet pipe, one end of which passes through a plurality of the third spaces and communicates with the first space, is used to release the liquefied natural gas in the first space.

[0010] Optionally, both the air inlet pipe and the air outlet pipe are equipped with flow regulating valves on the pipe body located outside the second housing.

[0011] Optionally, the first housing is made of carbon steel;

[0012] The second housing and the plurality of the third housings are all made of stainless steel.

[0013] Optionally, the thickness of the first housing is 8mm-10mm;

[0014] The thickness of the second shell is 10mm-12mm;

[0015] The thickness of each of the third housings is 5mm-8mm.

[0016] Optionally, the second housing is provided with a heat insulation layer of a preset thickness;

[0017] The preset thickness is 0.1m to 0.7m.

[0018] Optionally, the insulation layer is bonded to the outer wall of the second housing;

[0019] The insulation layer is made of foamed glass bricks, expanded perlite, glass fiber elastic felt, or glass wool.

[0020] Optionally, the outer wall of the second housing is provided with lifting lugs.

[0021] The liquefied natural gas (LNG) storage tank with thermal insulation function provided in this application forms a second space through a first shell and a second shell, and divides the second space into a third space through a third shell. Thermal insulation of the LNG in the first space is achieved by evacuating or filling the third space with an inert gas. Compared to existing LNG storage tanks that use insulation material between the inner and outer tanks, this application improves the thermal insulation performance of the LNG storage tank body by reducing heat conduction and radiation through a combination of evacuating or filling the third space with an inert gas. Furthermore, the third shell enhances the stability of the second space, preventing localized stress concentration after the LNG storage tank body is subjected to vibration, thereby improving the seismic resistance of the LNG storage tank body. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the state of a liquefied natural gas storage tank with heat preservation function during transportation, provided as an embodiment of this application;

[0024] Figure 2 A schematic diagram of the state of a liquefied natural gas storage tank with heat preservation function during use, provided as an embodiment of this application;

[0025] Figure 3 A schematic diagram of the structure of a liquefied natural gas storage tank with heat preservation function, provided in an embodiment of this application, having a first space and a second space;

[0026] Figure 4 A schematic diagram of the structure of a liquefied natural gas storage tank with heat preservation function provided in an embodiment of this application, which divides a second space into two third spaces through a third shell;

[0027] Figure 5 A schematic diagram of the structure of a liquefied natural gas storage tank with heat preservation function provided in an embodiment of this application, wherein the second space is divided into three third spaces by two third shells;

[0028] Figure 6 This is a schematic diagram of the structure in which the first shell, second shell, and third shell of a liquefied natural gas storage tank with heat preservation function are connected by a connecting rod, according to an embodiment of this application.

[0029] In the diagram: 100, liquefied natural gas storage tank body; 101, first shell; 1011, first space; 102, second shell; 1021, second space; 103, third shell; 1031, third space; 200, inlet pipe; 300, outlet pipe; 400, flow regulating valve; 500, insulation layer; 600, lifting lug; 700, connecting rod. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0031] refer to Figures 1 to 6 This application provides a liquefied natural gas storage tank with thermal insulation function, comprising:

[0032] The liquefied natural gas (LNG) storage tank body 100 includes a first shell 101, a second shell 102, and at least one third shell 103. The first shell 101 forms a first space 1011 for containing LNG, and a second space 1021 is formed between the first shell 101 and the second shell 102. At least one third shell 103 is disposed within the second space 1021 and is used to divide the second space 1021 into at least two third spaces 1031. The at least two third spaces 1031 are respectively used for vacuuming or filling with inert gas. The first space 1011, the second space 1021, and the third space 1031 are all sealed and enclosed. Since nitrogen is a colorless, odorless, and non-toxic gas with good chemical inertness and will not react with LNG, nitrogen is used as the inert gas in this application. For example, when there is one third housing 103, the third housing 103 divides the second space 1021 into two third spaces 1031. One third space 1031 is evacuated, and the other third housing 103 is filled with inert gas, or both third housings 103 are evacuated or filled with inert gas. The number of third housings 103 can be set according to the actual situation, and the evacuation or inert gas filling of multiple third spaces 1031 can also be set according to the actual situation, and this application does not make specific limitations on them.

[0033] Furthermore, to ensure the stability of the connection between the first housing 101, the second housing 102, and the third housing 103, each pair of adjacent housings is connected by a connecting rod 700, as detailed in [reference needed]. Figure 6 .

[0034] An intake pipe 200 is provided, one end of which passes through multiple third spaces 1031 and connects to a first space 1011, for supplying liquefied natural gas into the first space 1011; wherein, liquefied natural gas is introduced into the first space 1011 through the intake pipe 200 to achieve the storage of liquefied natural gas.

[0035] A gas outlet pipe 300 is provided, one end of which passes through multiple third spaces 1031 and connects to a first space 1011, for releasing liquefied natural gas (LNG) from the first space 1011. Specifically, when the LNG storage tank body 100 is moved to the desired location, LNG is discharged outside the LNG storage tank body 100 through the gas outlet pipe 300 to realize the utilization of the LNG.

[0036] The liquefied natural gas (LNG) storage tank with thermal insulation function provided in this application forms a second space 1021 through a first shell 101 and a second shell 102, and divides the second space 1021 into a third space 1031 through a third shell 103. Thermal insulation of the LNG within the first space 1011 is achieved by evacuating or filling the third space 1031 with inert gas. Compared to existing LNG storage tanks that use insulation material between the inner and outer tanks, this application reduces heat conduction and radiation by evacuating or filling the third space 1031 with a combination of inert gas and vacuuming, thereby improving the thermal insulation performance of the LNG storage tank body 100. Furthermore, the third shell 103 enhances the stability of the second space 1021, preventing localized stress concentration after the LNG storage tank body 100 is subjected to vibration, thus improving the seismic resistance of the LNG storage tank body 100.

[0037] In some embodiments, reference Figure 1 and Figure 2 In this application, both the air inlet pipe 200 and the air outlet pipe 300 located outside the second housing 102 are equipped with flow regulating valves 400. The specifications and models of the flow regulating valves 400 can be set according to actual needs, and this application does not impose specific limitations on them.

[0038] In the above embodiment, the flow rate of liquefied natural gas entering the first space 1011 from the inlet pipe 200 is measured by the flow regulating valve 400 on the inlet pipe 200, and the flow is opened or closed to allow liquefied natural gas to enter the first space 1011. Similarly, the flow rate of liquefied natural gas exiting the first space 1011 through the outlet pipe 300 is measured by the flow regulating valve 400 on the outlet pipe 300, and the flow is opened or closed to allow liquefied natural gas to enter the first space 1011 through the outlet pipe 300.

[0039] In some embodiments, the first shell 101 in this application is made of carbon steel. Since carbon steel has high strength and good welding performance, it can withstand changes in external environmental pressure and temperature, which makes the stability of the entire liquefied natural gas storage tank body 100 better, thereby ensuring the service life of the liquefied natural gas storage tank body 100.

[0040] In addition, the second shell 102 and the multiple third shells 103 are all made of stainless steel. Due to the excellent low-temperature performance, good corrosion resistance and high strength of stainless steel, the liquefied natural gas storage tank body 100 has good insulation and durability during the insulation process of liquefied natural gas.

[0041] In some embodiments, the thickness of the first housing 101 in this application is 8mm-10mm;

[0042] The thickness of the second housing 102 is 10mm-12mm;

[0043] The thickness of each of the multiple third housings 103 is 5mm-8mm.

[0044] In the above embodiments, in order to ensure the seismic resistance of the liquefied natural gas storage tank body 100 and to avoid its excessive weight, the thickness of the first shell 101, the thickness of the second shell 102, and the thickness of the third shell 103 all need to be within a certain range. The second shell 102 is the outermost layer of the liquefied natural gas storage tank body 100, that is, the second shell 102 plays the role of protecting the first shell 101 and the multiple third shells 103. Therefore, the thickness of the second shell 102 is greater than the thickness of the first shell 101 and the multiple third shells 103, while the thickness of the third shell 103 is less than the thickness of the first shell 101.

[0045] In some embodiments, reference Figures 3 to 6 In this application, the second shell 102 is provided with a heat insulation layer 500 of a preset thickness; wherein, the heat insulation layer 500 serves to further insulate the liquefied natural gas storage tank body 100, thereby improving the heat insulation performance of the liquefied natural gas storage tank body 100.

[0046] In addition, the preset thickness is 0.1m to 0.7m. If the insulation layer 500 is too thin, its insulation performance for the liquefied natural gas storage tank body 100 will be poor, while if the insulation layer 500 is too thick, it will result in material waste. Therefore, in order to ensure the insulation performance of the insulation layer 500 for the liquefied natural gas storage tank body 100 without causing material waste, the preset thickness of the insulation layer 500 needs to be within a suitable range. Specifically, a preset thickness of 0.1m to 0.7m can ensure the above-mentioned effect.

[0047] In some embodiments, the insulation layer 500 in this application is bonded to the outer wall of the second shell 102, which ensures the tightness of the connection between the insulation layer 500 and the second shell 102, so that the insulation layer 500 can further insulate the liquefied natural gas stored in the natural gas storage tank.

[0048] Specifically, the insulation layer 500 is made of foamed glass bricks, expanded perlite, fiberglass elastic felt, or glass wool. All of these materials have good thermal insulation properties, and the specific material can be selected according to the actual situation; however, this application does not further limit its selection.

[0049] In some embodiments, reference Figure 1 The second housing 102 in this application is provided with a lifting lug 600 on its outer wall.

[0050] In the above embodiments, there are at least two lifting lugs 600, and at least two lifting lugs 600 are equally spaced on the second shell 102, which facilitates the lifting of the liquefied natural gas storage tank body 100 to the required position by the lifting device, thereby improving the convenience of moving the liquefied natural gas storage tank body 100.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A liquefied natural gas storage tank with heat preservation function, characterized in that, include: A liquefied natural gas (LNG) storage tank body (100) includes a first shell (101), a second shell (102), and at least one third shell (103); the first shell (101) forms a first space (1011) for containing LNG, a second space (1021) is formed between the first shell (101) and the second shell (102), at least one of the third shells (103) is disposed in the second space (1021) and is used to divide the second space (1021) into at least two third spaces (1031), and the multiple third spaces (1031) are respectively used for vacuuming or filling with inert gas; An air intake pipe (200) is provided, one end of which passes through a plurality of the third spaces (1031) and is connected to the first space (1011) for allowing the liquefied natural gas to enter the first space (1011). The gas outlet pipe (300) has one end passing through multiple third spaces (1031) and communicating with the first space (1011) to release the liquefied natural gas in the first space (1011).

2. The liquefied natural gas storage tank with heat preservation function according to claim 1, characterized in that, Both the air inlet pipe (200) and the air outlet pipe (300) located outside the second housing (102) are equipped with flow regulating valves (400).

3. The liquefied natural gas storage tank with heat preservation function according to claim 1, characterized in that, The first housing (101) is made of carbon steel; The second housing (102) and the plurality of the third housings (103) are both made of stainless steel.

4. The liquefied natural gas storage tank with heat preservation function according to claim 1, characterized in that, The thickness of the first housing (101) is 8mm-10mm; The thickness of the second housing (102) is 10mm-12mm; The thickness of each of the third housings (103) is 5 mm - 8 mm.

5. The liquefied natural gas storage tank with heat preservation function according to any one of claims 1 to 4, characterized in that, The second housing (102) is provided with a heat insulation layer (500) of a preset thickness. The preset thickness is 0.1m to 0.7m.

6. The liquefied natural gas storage tank with heat preservation function according to claim 5, characterized in that, The insulation layer (500) is bonded to the outer wall of the second housing (102); The insulation layer (500) is made of foamed glass bricks, expanded perlite, glass fiber elastic felt or glass wool.

7. The liquefied natural gas storage tank with heat preservation function according to any one of claims 1 to 4, characterized in that, The second housing (102) is provided with a lifting lug (600) on its outer wall.

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