Cryogenic liquid storage system

Abstract

The utility model provides a low-temperature liquid storage system, and particularly relates to the field of low-temperature storage, the low-temperature liquid storage system comprises a storage tank, the storage tank comprises a frozen soil layer, a heat insulation layer, an ice layer and a supporting structure which are sequentially arranged from inside to outside, and a flange sealing structure is further arranged at the top of the storage tank. The flange sealing structure is fixedly connected with the supporting structure, the frozen soil layer, the heat insulation layer and the ice layer are sealed in the supporting structure, the frozen soil layer is used for being in direct contact with and storing low-temperature liquid, and the frozen soil layer is adopted for being in direct contact with the low-temperature liquid and storing the low-temperature liquid; the frozen soil has low temperature resistance, the lower the temperature is, the higher the mechanical properties such as the strength of the frozen soil are, a good supporting effect can be achieved, the cost of the low-temperature storage system is greatly reduced when the frozen soil is used for storing low-temperature liquid, and the system can be used in the overground or underground environment.

Description

Technical Field

[0001] The utility model relates to the field of low-temperature storage, in particular to a low-temperature liquid storage system. Background Art

[0002] Cryogenic liquid storage refers to the technology of storing gas after liquefying it at extremely low temperatures. This technology plays an important role in energy supply, energy reserves, industrial applications, medical equipment, aerospace, clean energy, food industry, precision manufacturing and other fields.

[0003] At present, the cryogenic liquid storage system includes storage tanks, insulation systems, pressure and temperature monitoring and control systems, pipelines, valves and other transportation systems. Among them, the storage tank is the main container for storing cryogenic liquids, usually with a double-layer structure. The inner tank is used to directly store the cryogenic liquid, and the outer tank supports and protects the inner tank. The tank body is usually made of stainless steel. At the same time, a vacuum is drawn between the outer tank and the inner tank to reduce heat conduction and convection, thereby reducing heat transfer, or multiple layers of reflective materials are used in the vacuum space to further reduce radiation heat transfer.

[0004] However, existing cryogenic storage tanks require the use of materials such as hydrogen embrittlement-resistant austenitic stainless steel and complex welding manufacturing processes to ensure strength and durability at extremely low temperatures, which makes the manufacturing cost of the entire cryogenic storage tank relatively high. Utility Model Content

[0005] In order to solve the problem of high manufacturing cost of low-temperature storage tanks in the prior art, the utility model proposes a low-temperature liquid storage system.

[0006] The utility model is realized by the following technical solutions:

[0007] The utility model proposes a low-temperature liquid storage system including a storage tank, wherein the storage tank includes a frozen soil layer, an insulating layer, an ice layer and a supporting structure arranged in sequence from the inside to the outside, and a flange sealing structure is also arranged on the top of the storage tank. The flange sealing structure is fixedly connected to the supporting structure and seals the frozen soil layer, the insulating layer and the ice layer inside the supporting structure, and the frozen soil layer is used to directly contact and store the cryogenic liquid.

[0008] Furthermore, it also includes a regulating component, which includes a filling pipeline. The filling pipeline sequentially penetrates the flange sealing structure, the insulation layer and the frozen soil layer and is connected to the inside of the frozen soil layer.

[0009] Furthermore, the regulating component also includes a pressure relief pipeline, which passes through the flange sealing structure, the insulation layer and the frozen soil layer in sequence and is connected to the inside of the frozen soil layer.

[0010] Furthermore, a low-temperature back-pressure valve is provided on each side of the pressure relief pipeline, and the low-temperature back-pressure valve is communicated with the pressure relief pipeline.

[0011] Furthermore, a safety valve connected to the pressure relief pipeline is also provided at the top of the pressure relief pipeline.

[0012] Furthermore, a pressure gauge is provided on the pressure relief pipeline, and the regulating component also includes a pressure sensor, and the pressure sensor is provided on the flange sealing structure.

[0013] Furthermore, a vacuum sleeve pressure relief valve connected to the pressure relief pipeline is also provided on one side of the pressure relief pipeline.

[0014] Furthermore, the regulating component also includes a flow meter and a liquid level meter connected to the frozen soil layer.

[0015] Furthermore, the flange sealing structure is provided with a plurality of lead-in openings.

[0016] Beneficial effects of the utility model:

[0017] (1) The low-temperature liquid storage system proposed in the utility model uses a frozen soil layer to directly contact the low-temperature liquid and store the low-temperature liquid. The frozen soil itself has the performance of being resistant to low temperatures. The lower the temperature, the greater the strength and other mechanical properties of the frozen soil. It can play a good supporting role and greatly reduce the cost of the low-temperature storage system.

[0018] (2) The cryogenic liquid storage system proposed in the utility model utilizes an ice layer to seal the cryogenic liquid, which can prevent groundwater from infiltrating the reservoir in an underground environment. At the same time, the ice layer can also play a role in heat insulation to prevent heat leakage of the cryogenic liquid.

[0019] (3) The cryogenic liquid storage system proposed in the utility model can be set up on the ground or underground according to actual conditions. When set up underground, the site occupied by the entire cryogenic liquid storage system can be reduced, which is more conducive to the installation of large-scale cryogenic liquid storage systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a cross-sectional view of the cryogenic liquid storage system of the utility model;

[0021] Figure 2 This is the overall structural diagram of the cryogenic liquid storage system of the utility model;

[0022] In the figure: frozen soil layer 1, insulation layer 2, ice layer 3, support structure 4, flange sealing structure 5, pressure sensor 6, charging pipeline 7, low-temperature back pressure valve 8, safety valve 9, pressure gauge 10, pressure relief pipeline 11, flow meter 12, lead port 13, liquid level gauge 14, vacuum casing pressure relief valve 15;

[0023] The realization of the purpose, functional features and advantages of the present invention will be further described in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0024] In order to more clearly and completely illustrate the technical solution of the present invention, the present invention is further described below in conjunction with the accompanying drawings.

[0025] Please refer to Figure 1-Figure 2 The utility model proposes a low-temperature liquid storage system including a storage tank, which includes a frozen soil layer 1, an insulating layer 2, an ice layer 3 and a supporting structure 4 arranged in sequence from the inside to the outside. A flange sealing structure 5 is also arranged on the top of the storage tank. The flange sealing structure 5 is fixedly connected to the supporting structure 4 and seals the frozen soil layer 1, the insulating layer 2 and the ice layer 3 inside the supporting structure 4. The frozen soil layer 1 is used to directly contact and store the cryogenic liquid.

[0026] In this embodiment:

[0027] The frozen soil layer 1 is used for directly contacting and storing cryogenic liquid;

[0028] The heat insulation layer 2 is used for heat preservation and insulation;

[0029] The ice layer 3 is used to provide a secondary seal and act as a thermal barrier;

[0030] The support structure 4 is used to support the crypt and accommodate the internal structure;

[0031] The flange sealing structure 5 is used for sealing the supporting structure 4;

[0032] In a specific embodiment, the insulation layer 2 is stacked using stacking insulation technology. The ice layer 3 cooperates with the insulation layer 2 to isolate heat leakage while acting as a thermal barrier to maintain the low temperature stability of the inner cavity. The entire energy storage system is installed in the underground space. The support structure 4 supports the cave on the outside while providing a support structure 4 on the inside for the internal ice layer 3, insulation layer 2 and frozen soil layer 1. Most materials become fragile in low temperature environments, and frozen soil is formed in the low temperature process and has low temperature resistance. The lower the temperature, the greater the mechanical properties of the frozen soil, such as strength, and can play a good supporting role. The underground soil resources are abundant, and local materials can be used to utilize the underground space while reducing the material cost of the cryogenic liquid storage system.

[0033] In one embodiment, thermal insulation materials may also be added to the outside of the ice layer 3 to isolate the hot end from the ice layer 3 and maintain the temperature stability of the ice layer 3. The insulation layer 2 is stacked using stacking insulation technology, using low thermal conductivity materials such as hollow glass, and a porous structure is constructed in a stacking manner to reduce heat transfer, thereby avoiding the high cost, complex operation and maintenance, and other problems in vacuum insulation technology.

[0034] In one embodiment, the present application can set the entire system underground or above ground according to actual conditions. When set underground, it occupies less space and is more conducive to the installation of large storage systems. When set above ground, good insulation measures need to be taken.

[0035] Furthermore, it also includes a regulating component, which includes a filling pipeline 7. The filling pipeline 7 sequentially penetrates the flange sealing structure 5, the insulation layer 2 and the frozen soil layer 1 and is connected to the inside of the frozen soil layer 1.

[0036] In this embodiment:

[0037] The filling pipeline 7 is used for filling liquid hydrogen;

[0038] In a specific embodiment, the filling method of the filling pipeline 7 can be selected according to actual conditions, such as filling liquid hydrogen from the top, or setting the filling pipeline 7 to penetrate from the bottom to the frozen soil layer 1 to fill liquid hydrogen from the bottom.

[0039] Furthermore, the regulating component also includes a pressure relief pipeline 11, which passes through the flange sealing structure 5, the insulation layer 2 and the frozen soil layer 1 in sequence and is connected to the inside of the frozen soil layer 1.

[0040] In this embodiment:

[0041] The pressure relief pipeline 11 is used to connect the pressure relief element;

[0042] In a specific implementation, the pressure relief pipeline 11 is connected to the frozen soil layer 1, and a pressure relief element is connected to the pressure relief pipeline 11. When the pressure is too high, it will automatically work to relieve pressure to ensure stable pressure during the storage of low-temperature liquid.

[0043] Furthermore, a low-temperature back-pressure valve 8 is provided on each side of the pressure relief pipeline 11 , and the low-temperature back-pressure valve 8 is communicated with the pressure relief pipeline 11 .

[0044] In this embodiment:

[0045] The cryogenic back pressure valve 8 is used to maintain the pressure before the valve;

[0046] In a specific embodiment, the cryogenic back pressure valve 8 maintains the pressure before the valve during storage, and automatically releases pressure when overpressure occurs, thereby ensuring stable pressure during storage of the cryogenic liquid.

[0047] Furthermore, a safety valve 9 connected to the pressure relief pipeline 11 is also provided at the top of the pressure relief pipeline 11 .

[0048] In this embodiment:

[0049] Safety valve 9 is used to release excess pressure;

[0050] In a specific embodiment, the safety valve 9 can be activated when the liquid vaporizes to release excess pressure to avoid accidents.

[0051] Furthermore, a pressure gauge 10 is provided on the pressure relief pipeline 11 , and the regulating component also includes a pressure sensor 6 , which is provided on the flange sealing structure 5 .

[0052] In a specific embodiment, the pressure gauge 10 and the pressure sensor 6 are used to monitor the evaporation amount of the cryogenic liquid during the storage process so as to release the pressure in time when the pressure is too high.

[0053] Furthermore, a vacuum sleeve pressure relief valve 15 communicating with the pressure relief pipeline 11 is also provided on one side of the pressure relief pipeline 11 .

[0054] In this embodiment:

[0055] Vacuum casing pressure relief valve 15 is used to discharge high pressure gas

[0056] In a specific implementation, when the pressure of the frozen soil layer 1 is detected to be abnormal, the vacuum casing pressure relief valve 15 is opened to discharge the high-pressure gas in time to ensure the safety of the system.

[0057] Furthermore, the regulating component also includes a flow meter 12 and a liquid level meter 14 connected to the frozen soil layer 1 .

[0058] In a specific embodiment, the liquid level meter 14 is used to monitor the liquid level of the cryogenic liquid in the frozen soil layer 1, and the flow meter 12 is used to monitor the evaporation of the cryogenic liquid.

[0059] Furthermore, a plurality of lead-in openings 13 are provided on the flange sealing structure 5 .

[0060] In a specific embodiment, the lead-in port 13 is used to lead in temperature sensors of the frozen soil layer 1, the insulation layer 2 and the ice layer 3 inside the supporting structure 4. The temperature sensors monitor the temperature inside the storage tank and the transmission system in real time to ensure the stability of the low-temperature environment.

[0061] Of course, the present utility model may have many other implementations. Based on the present implementation, other implementations obtained by ordinary technicians in this field without any creative work are all within the scope of protection of the present utility model.

Claims

1. A cryogenic liquid storage system, characterized in that: The invention comprises a storage tank, which comprises a frozen soil layer, an insulating layer, an ice layer and a supporting structure arranged in sequence from the inside to the outside. A flange sealing structure is also arranged on the top of the storage tank. The flange sealing structure is fixedly connected to the supporting structure and seals the frozen soil layer, the insulating layer and the ice layer inside the supporting structure. The frozen soil layer is used for directly contacting and storing low-temperature liquid.

2. The cryogenic liquid storage system according to claim 1, characterized in that: It also includes a regulating component, which includes a filling pipeline. The filling pipeline sequentially passes through the flange sealing structure, the insulation layer and the frozen soil layer and is connected to the inside of the frozen soil layer.

3. The cryogenic liquid storage system according to claim 2, characterized in that: The regulating component also includes a pressure relief pipeline, which passes through the flange sealing structure, the insulation layer and the frozen soil layer in sequence and is connected to the inside of the frozen soil layer.

4. The cryogenic liquid storage system according to claim 3, characterized in that: A low-temperature back-pressure valve is respectively arranged on both sides of the pressure relief pipeline, and the low-temperature back-pressure valve is communicated with the pressure relief pipeline.

5. The cryogenic liquid storage system according to claim 4, characterized in that: A safety valve connected to the pressure relief pipeline is also arranged on the top of the pressure relief pipeline.

6. The cryogenic liquid storage system according to claim 5, characterized in that: The pressure relief pipeline is also provided with a pressure gauge, and the regulating component further includes a pressure sensor, which is provided on the flange sealing structure.

7. The cryogenic liquid storage system according to claim 6, characterized in that: A vacuum sleeve pressure relief valve connected to the pressure relief pipeline is also provided on one side of the pressure relief pipeline.

8. The cryogenic liquid storage system according to claim 2, characterized in that: The regulating component also includes a flow meter and a liquid level meter communicated with the frozen soil layer.

9. The cryogenic liquid storage system according to claim 2, characterized in that: The flange sealing structure is also provided with a plurality of lead-in openings.

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