Low temperature container insulation structure and method of calculating the same

Abstract

The application discloses a low-temperature container heat insulation structure and a calculation method thereof. The low-temperature container heat insulation structure comprises a spherical outer container and an inner container. The outer container is sealedly arranged around the inner container. An insulation layer is arranged between the inner container and the outer container. The inner container comprises a gas-phase interlayer space at an upper portion and a liquid-phase interlayer space at a lower portion. The gas-phase interlayer space at the upper portion comprises a saturated vapor layer and a gas-liquid coexisting layer. The liquid-phase interlayer space at the lower portion comprises a first liquid layer, a second liquid layer and a third liquid layer. The outer container and the inner container are arranged eccentrically. The thickness of the inner container is not equal, and the distance from the gas-phase interlayer space at the upper portion to the liquid-phase interlayer space at the lower portion gradually increases. The application effectively reduces energy loss and reduces the use of raw materials.

Description

Technical Field

[0001] This invention relates to the technical field of cryogenic containers with complete thermal insulation between double-layered inner and outer container bodies, specifically to a thermal insulation structure for cryogenic containers and an iterative calculation method for heat transfer. Background Technology

[0002] Currently, for double-layered cryogenic insulated containers, existing technologies calculate the average area, average temperature difference, and average heat input of the inner and outer containers, resulting in low precision and inaccurate results. Since the daily liquid evaporation varies, the calculation of safe discharge is coarse, posing a safety hazard. Furthermore, it fails to accurately calculate the liquid vaporization rate for different liquid volumes within the container. Using a uniform insulation layer thickness fails to achieve the required insulation layer thickness within the container and between the gas and liquid layers, leading to waste of insulation material. Summary of the Invention

[0003] The purpose of this invention is to address the aforementioned problems by providing a cryogenic container insulation structure and its calculation method. The structure includes a spherical outer container and an inner container. The outer container encloses and seals the inner container, and an insulation layer is provided between the inner container and the outer container. The inner container includes an upper gas phase interlayer space and a lower liquid phase interlayer space. The upper gas phase interlayer space includes a saturated vapor layer and a gas-liquid coexistence layer, while the lower liquid phase interlayer space includes a first liquid layer, a second liquid layer, and a third liquid layer. The outer container and the inner container are eccentrically arranged, and the inner container forms a structure of varying thickness where the distance from the upper gas phase interlayer space to the lower liquid phase interlayer space gradually increases. This invention effectively reduces energy loss and the amount of raw materials used.

[0004] The technical solution adopted in this invention is as follows:

[0005] This invention discloses a cryogenic container insulation structure, comprising a spherical outer container and an inner container. The outer container encloses and seals the inner container, and an insulation layer is disposed between the inner container and the outer container. The inner container includes an upper gas phase interlayer space and a lower liquid phase interlayer space. The upper gas phase interlayer space includes a saturated vapor layer and a gas-liquid coexistence layer, and the lower liquid phase interlayer space includes a first liquid layer, a second liquid layer, and a third liquid layer. The insulation layer encloses the inner container, and the outer container and the inner container are eccentrically arranged. The inner container forms a structure with varying thickness, where the distance from the upper gas phase interlayer space to the lower liquid phase interlayer space gradually increases.

[0006] This invention discloses a calculation method for the insulation structure of a cryogenic container, including an iterative calculation method. The container includes a spherical outer container and an inner container, with an insulation layer covering the inner container. The inner container includes an upper gas phase interlayer space and a lower liquid phase interlayer space. The liquid phase interlayer space contains cryogenic liquid. Based on the ratio of the daily vaporization of the cryogenic liquid to the total amount of stored liquid, and according to the actual distribution of the cryogenic liquid in the inner container, iterative calculations are performed layer by layer from the upper gas phase interlayer space to the lower liquid phase interlayer space to achieve equal heat input per unit area in each layer.

[0007] Furthermore, the iterative calculation method includes calculating the heat transfer formula of the insulation layer, which is Q=λA△T / δ, where Q is the heat transfer per unit area, λ is the thermal conductivity, A is the heat transfer area, △T is the temperature difference of heat conduction, and δ is the thickness of the insulation layer.

[0008] Furthermore, the insulation layer includes a radiation screen and spacers. The outer surface of the inner container is filled with several layers of radiation screens and spacers, and a vacuum setting is adopted. The insulation layer forms a heat insulation barrier between the inner container and the outer container.

[0009] Furthermore, the inner container stores a cryogenic liquid, and the outer container protects the insulation layer, forming a vacuum insulation cavity. The insulation layer includes a radiation screen and spacers, forming a composite insulation layer with varying thicknesses.

[0010] Furthermore, the upper gas phase interlayer space includes a saturated vapor layer and a gas-liquid coexistence layer, and the lower liquid phase interlayer space includes a first liquid layer, a second liquid layer, and a third liquid layer; the heat transfer area, temperature difference, and corresponding number of radiation screens and spacers for the saturated vapor layer, the gas-liquid coexistence layer, the first liquid layer, the second liquid layer, and the third liquid layer are determined respectively, and the heat input value of each layer is accurately calculated to achieve equal heat input per unit area for each layer.

[0011] Furthermore, the inner container is provided with a composite insulation layer of varying thickness. The inner container includes a saturated vapor layer, a gas-liquid coexistence layer, a first liquid layer, a second liquid layer, and a third liquid layer. The temperature of each layer is set to match the number of layers of the radiation screen and spacers.

[0012] Furthermore, it includes a skirt base connected to an outer base to support the insulation structure of the cryogenic container, the skirt base being installed on the bottom surface of the outer container.

[0013] The technical effects of this invention are as follows:

[0014] This invention discloses a cryogenic container insulation structure and its calculation method. It accurately calculates the heat input values ​​for each layer of the stored cryogenic liquid gas layer, gas-liquid coexistence layer, and liquid layer, ultimately achieving equal heat input per unit area for each layer, and matching the layer temperature with the number of radiation shields and spacers. This application effectively solves the problem of reduced liquid volume and increased daily liquid vaporization due to temperature differences between layers in cryogenic containers during use; it also addresses the difficulty in ensuring safe discharge requirements due to unequal heat input per unit area; and it sets different numbers of radiation shields and spacers for different layers to prevent waste of insulation material between layers. It also solves the calculation of heat transfer at different temperatures in each layer. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the thermal insulation structure of the cryogenic container of the present invention;

[0016] Figure 2 This is a schematic diagram of the structure of the insulation layer of the present invention;

[0017] The diagram is labeled as follows: 1-Atmosphere, 2-Saturated vapor layer, 3-Gas-liquid coexistence layer, 4-First liquid layer, 5-Second liquid layer, 6-Third liquid layer, 7-Bottom of outer container, 8-Skirt, 9-Insulation layer, 901-Radiation screen, 902-Spacer, 10-Inner container, 11-Outer container. Detailed Implementation

[0018] The present invention will now be described in detail with reference to the accompanying drawings.

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0020] The data used in this embodiment is a preferred solution, but it is not intended to limit the present invention.

[0021] Example 1

[0022] like Figure 1-2 As shown, this embodiment provides a cryogenic container insulation structure, including a spherical outer container 11 and an inner container 10. The outer container 11 encloses and seals the inner container 10. An insulation layer 9 is provided between the inner container 10 and the outer container 11. The inner container 10 includes an upper gas phase interlayer space and a lower liquid phase interlayer space. The upper gas phase interlayer space includes a saturated vapor layer 2 and a gas-liquid coexistence layer 3. The lower liquid phase interlayer space includes a first liquid layer 4, a second liquid layer 5, and a third liquid layer 6. The insulation layer 9 encloses the inner container 10. The outer container 11 and the inner container 10 are eccentrically arranged. The inner container 10 forms a structure with varying thickness, where the distance from the upper gas phase interlayer space to the lower liquid phase interlayer space gradually increases.

[0023] In this embodiment, different insulation methods and different insulation layer thicknesses are used for different temperature fields to achieve equivalent insulation effects for the insulation requirements of each temperature field, thereby minimizing daily evaporation loss.

[0024] In this embodiment, preferably, a main body ring is provided between the inner container 10 and the outer container 11, and the main body ring is configured as a welded structure.

[0025] In this embodiment, the inner container 10 stores cryogenic liquid, and the outer container 11 protects the insulation layer 9, forming a vacuum insulation cavity. The insulation layer 9 includes a radiation screen 901 and a spacer 902, forming a composite insulation layer 9 with varying thickness. The insulation layer 9 serves as a thermal barrier for the interlayer space between the inner container 10 and the outer container 11, effectively reducing the height of the cryogenic insulation container and lowering transportation costs, saving space and materials.

[0026] In this embodiment, the inner container 10 is provided with a composite insulation layer 9 of varying thickness. The inner container 10 includes a saturated vapor layer 2, a gas-liquid coexistence layer 3, a first liquid layer 4, a second liquid layer 5, and a third liquid layer 6. The temperature of each layer is set to match the number of layers of the radiation screen 901 and the spacer 902. This is to solve the problem that the amount of liquid vaporized into vapor increases daily due to the decrease in the amount of liquid stored in the cryogenic container during use. In other words, the composite insulation layer 9 of varying thickness solves the problem that the uneven heat input per unit area makes it difficult to ensure the safe discharge requirements of the container.

[0027] In this embodiment, a skirt 8 is included, which is connected to the outer base and supports the insulation structure of the cryogenic container. The skirt 8 is installed on the bottom surface 7 of the outer container 11. The skirt 8 is a support structure for the insulation structure of the cryogenic container. Preferably, the support structure is provided with a fiberglass transition structure.

[0028] In this embodiment, the inner container 10 and outer container 11 of the cryogenic container insulation structure are eccentrically arranged to achieve the requirement that the insulation structure thickness of the saturated vapor layer 2, the gas-liquid coexistence layer 3, the first liquid layer 4, the second liquid layer 5 and the third liquid layer 6 gradually increase.

[0029] In this embodiment, the cryogenic container insulation structure focuses on controlling the temperature between the layers of the medium filled in the inner container 10, as well as the optimal interlayer distance between the inner container 10 and the outer container 11. This involves selecting the insulation material within the interlayer insulation cavity between the inner and outer containers, and determining the vacuum level. The number of layers of the radiation screen 901 and the spacer 902 is determined through calculation.

[0030] Example 2

[0031] like Figure 1-2As shown, this embodiment provides a calculation method for the insulation structure of a cryogenic container, including an iterative calculation method. The container includes a spherical outer container 11 and an inner container 10. The inner container 10 is covered with an insulation layer 9. The inner container 10 includes an upper gas phase interlayer space and a lower liquid phase interlayer space. Based on the ratio of the daily vaporization of cryogenic liquid to the total amount of stored liquid, and according to the actual distribution of cryogenic liquid in the inner container 10, the calculation is performed layer by layer iteratively from the upper gas phase interlayer space to the lower liquid phase interlayer space to achieve equal heat input per unit area in each layer.

[0032] In this embodiment, a composite insulation structure and a temperature field stepped iterative insulation calculation method are used to classify and design insulation cavities accordingly. Different insulation methods and structures are used for insulation protection based on the temperature distribution of the medium inside the container, thereby reducing costs, lowering energy consumption, and achieving the beneficial effect of environmental protection.

[0033] In this embodiment, the iterative calculation method includes calculating the heat transfer formula of the insulation layer 9. The heat transfer formula of the insulation layer 9 is Q=λA△T / δ, where Q is the heat transfer per unit area, λ is the thermal conductivity, A is the heat transfer area, △T is the temperature difference of heat conduction, and δ is the thickness of the insulation layer.

[0034] Furthermore, in this embodiment, including an atmosphere layer 1, the heat transfer path of the cryogenic container insulation structure is as follows: the outer container 11, located in the atmosphere layer 1, absorbs heat and transfers it to a trace amount of gas in the interlayer; additionally, it is transferred through radiation to the radiation screen 901 and spacer 902 of the insulation layer 9, and then input to the inner container 10 to transfer heat to the cryogenic liquid, thereby increasing the vaporization temperature of the liquid. The amount of heat transferred through the heat transfer path is directly proportional to the container surface area, inversely proportional to the thickness of the heat transfer layer, and directly proportional to the temperature difference between hot and cold.

[0035] In this embodiment, the insulation layer 9 includes a radiation screen 901 and a spacer 902. The outer surface of the inner container 10 is filled with several layers of radiation screen 901 and spacer 902, and a vacuum setting is adopted. The insulation layer 9 forms a heat insulation barrier between the inner container 10 and the outer container 11, which effectively reduces the height of the low-temperature insulation container and reduces transportation costs, saves space and materials.

[0036] In this embodiment, the upper gas phase interlayer space includes a saturated vapor layer 2 and a gas-liquid coexistence layer 3, and the lower liquid phase interlayer space includes a first liquid layer 4, a second liquid layer 5, and a third liquid layer 6. The heat transfer area, temperature difference, and corresponding number of radiation screens 901 and spacers 902 layers of the saturated vapor layer 2, the gas-liquid coexistence layer 3, the first liquid layer 4, the second liquid layer 5, and the third liquid layer 6 are determined respectively, and the heat input value of each layer is accurately calculated to achieve equal heat input per unit area of ​​each layer.

[0037] In this embodiment, the iterative calculation method is used to set up the composite insulation layer 9, which solves the problem that the amount of liquid stored in the cryogenic container decreases during use, resulting in an increase in the daily amount of liquid vaporization into steam; it also solves the problem that the uneven heat input per unit area makes it difficult to ensure the safe discharge requirements of the container; and it sets different numbers of radiation screens 901 and spacers 902 for different layer requirements, eliminating the waste of insulation materials between layers. It also solves the calculation of heat transfer at different layer temperatures.

[0038] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method of calculating a cryogenic vessel insulation structure, characterized by, The method includes an iterative calculation approach, comprising a spherical outer container and an inner container, the inner container being covered by an insulating layer that encloses the inner container. The inner container includes an upper gas phase interlayer space and a lower liquid phase interlayer space, wherein a cryogenic liquid is placed in the liquid phase interlayer space. Based on the ratio of the daily vaporization of the cryogenic liquid to the total amount of stored liquid, and according to the actual distribution of the cryogenic liquid contained in the inner container, the outer container and the inner container are arranged eccentrically. The inner container forms a structure of varying thickness with the distance from the upper gas phase interlayer space to the lower liquid phase interlayer space increasing. Layered iterative calculations are performed from the upper gas phase interlayer space to the lower liquid phase interlayer space to achieve equal heat input per unit area in each layer. The iterative calculation method includes calculating the heat transfer formula of the insulation layer, which is Q=λA△T / δ, where Q is the heat transfer per unit area, λ is the thermal conductivity, A is the heat transfer area, △T is the temperature difference of heat conduction, and δ is the thickness of the insulation layer. The upper gas phase interlayer space includes a saturated vapor layer and a gas-liquid coexistence layer, and the lower liquid phase interlayer space includes a first liquid layer, a second liquid layer, and a third liquid layer; the heat transfer area, temperature difference, and corresponding number of radiation screens and spacers for the saturated vapor layer, the gas-liquid coexistence layer, the first liquid layer, the second liquid layer, and the third liquid layer are determined respectively, and the heat input value of each layer is accurately calculated to achieve equal heat input per unit area for each layer; The inner container stores a cryogenic liquid, and the outer container protects the insulation layer, forming a vacuum insulation cavity. The insulation layer includes a radiation screen and spacers, forming a composite insulation layer with varying thicknesses.

2. The method of claim 1, wherein, The insulation layer includes a radiation screen and spacers. The outer surface of the inner container is filled with several layers of radiation screens and spacers, and a vacuum is used. The insulation layer forms a heat insulation barrier between the inner container and the outer container.

3. The method of claim 2, wherein, The inner container is provided with a composite insulation layer of varying thickness. The inner container includes a saturated vapor layer, a gas-liquid coexistence layer, a first liquid layer, a second liquid layer, and a third liquid layer. The temperature of each layer is set to match the number of radiation screens and spacers.

4. The method of calculating a cryogenic vessel insulation structure according to claim 3, wherein, It includes a skirt base, which is connected to the outer base to support the insulation structure of the cryogenic container. The skirt base is installed on the bottom surface of the outer container.

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