Capillary bundle check valve for low temperature storage tank

Abstract

The application discloses a capillary bundle check valve suitable for a low-temperature storage tank and a technical principle thereof. The application mainly comprises a low-temperature storage tank, a storage tank connecting pipeline and a capillary bundle, and the capillary bundle is uniformly distributed with capillary tubes which are parallel to the axis of the capillary bundle column body. The capillary bundle is cooperatively installed with the connecting pipeline. The application can prevent the low-temperature liquid in the low-temperature storage tank from flowing back to the inside of the connecting pipeline, and can improve the safety performance of the low-temperature storage tank.

Description

Technical Field

[0001] This invention relates to a capillary bundle check valve device and its technical principle suitable for cryogenic storage tanks, and relates to the field of cryogenic storage. Background Technology

[0002] Cryogenic storage technology is widely used in various fields, such as cryogenic hydrogen, oxygen, and nitrogen storage. This technology stores the required substances in the form of cryogenic liquids within tanks. When needed, the substances are extracted through pipes connecting the tank to the outside environment. While the tank itself is typically kept at a low temperature, the walls of the connecting pipes are often at a higher temperature. When the tank's operating position changes, the cryogenic liquid inside may directly submerge the connecting pipes. In this case, the cryogenic liquid comes into direct contact with the pipe walls, and due to the high pipe wall temperature, the cryogenic liquid rapidly absorbs heat and evaporates, causing a rapid increase in pressure within the tank and threatening its safety. Summary of the Invention

[0003] In view of this, the present invention proposes a capillary bundle check valve suitable for cryogenic storage tanks, which can prevent direct contact between the cryogenic working fluid in the storage tank and the wall of the connecting pipe.

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

[0005] A capillary bundle check valve for cryogenic storage tanks includes a cryogenic storage tank, a tank connecting pipe, and a capillary bundle.

[0006] In some embodiments, the cryogenic storage tank includes an inner tank liner, an outer tank liner, and a heat insulation layer between the inner and outer tank liner.

[0007] In some embodiments, the cryogenic storage tank includes a tank liner and insulation material.

[0008] In some embodiments, one end of the connecting pipe is connected to the inner liner of the cryogenic storage tank, and the other end of the connecting pipe is connected to the outer liner of the storage tank.

[0009] In some embodiments, one end of the connecting pipe is connected to the inner liner of the cryogenic storage tank, and the other end of the connecting pipe is exposed outside the storage tank.

[0010] In some embodiments, the capillary bundle is a column with capillaries uniformly distributed inside, parallel to the axis of the column.

[0011] In some embodiments, the capillary bundle is adapted to the connecting pipe, and the outer cylindrical surface of the capillary bundle mates with the inner wall surface of the connecting pipe, so that the capillary bundle is fixed inside the connecting pipe.

[0012] In some embodiments, the capillary bundle surface contact angle is greater than 90°, which gives the capillary bundle hydrophobic properties.

[0013] In some embodiments, the connecting pipe is equipped with a valve in the section between the inner liner of the cryogenic storage tank and the outside of the tank to control the connection and disconnection between the inner liner of the cryogenic storage tank and the outside of the tank.

[0014] When the operating position of the storage tank changes, causing the cryogenic liquid level inside the tank to rise above the connecting pipe, the presence of the capillary bundle prevents the cryogenic liquid from directly entering the connecting pipe. A portion of the cryogenic liquid is forced into the capillaries within the capillary bundle and vaporizes after absorbing heat, while another portion vaporizes directly on the surface of the capillary bundle. Due to the pressure difference, most of the vaporized gas passes through the capillary bundle into the gas column between the capillary bundle and the valve in the connecting pipe, thus increasing the gas column pressure. The combined pressure of the gas column and the additional pressure created by capillary action forms a pressure difference with the cryogenic liquid inside the tank, preventing further entry of the cryogenic liquid into the connecting pipe and thus preventing excessive vaporization.

[0015] Beneficial effects:

[0016] This invention utilizes capillary action and pressure difference to prevent the backflow of cryogenic liquid from the cryogenic storage tank into the connecting pipe, thereby improving the safety of the storage tank. Attached Figure Description

[0017] Figure 1 This is a simplified diagram of the installation position of the cryogenic storage tank during normal operation in Embodiment 1 of the present invention;

[0018] Figure 2 This is a simplified diagram of the position of the cryogenic storage tank under the condition of a 90-degree change in attitude in Embodiment 1 of the present invention;

[0019] Figure 3 This is a simplified diagram of the installation position of the cryogenic storage tank during normal operation in Embodiment 2 of the present invention;

[0020] Figure 4 This is a simplified diagram of the position of the cryogenic storage tank under the condition of a 90-degree change in attitude in Embodiment 2 of the present invention;

[0021] Figure 5 This is an installation diagram of Embodiment 1 of the present invention;

[0022] Figure 6 This is an installation diagram of Embodiment 2 of the present invention;

[0023] Figure 7 This is a simplified diagram of a capillary bundle in one embodiment of the present invention;

[0024] Among them, 1-connecting pipe valve; 2-connecting pipe; 3-capillary bundle; 4-outer wall of storage tank; 5-inner wall of storage tank; 6-low temperature liquid level inside the tank. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present application, the present invention will be described in detail below with reference to the accompanying drawings and embodiments. Obviously, the described embodiments are only a part of the embodiments in this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort should fall within the scope of protection of this application.

[0026] It should be noted that the terms "comprising" and "having" and any variations thereof in the specification, claims and accompanying drawings of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such processes, methods, products or devices.

[0027] The terms "set up," "equipped with," "connected," "linked," and "cooperate" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0028] Example 1

[0029] like Figure 1 As shown, in this example, the application scenario of the present invention is an inner and outer liner type cryogenic storage tank.

[0030] like Figure 7 As shown, the main body of the capillary bundle is a columnar structure, with capillaries uniformly distributed along the axis and running through the whole.

[0031] When the storage tank is operating in its normal position, such as Figure 1 As shown, at this time, the cryogenic liquid level inside the tank is below the connecting pipe, and the cryogenic liquid does not submerge the connecting pipe.

[0032] When the working posture of the storage tank undergoes a significant deflection, such as a 90-degree deflection, ... Figure 2As shown. At this point, the cryogenic liquid level in the tank submerges the opening of the connecting pipe. Due to the presence of the capillary bundle, the cryogenic liquid in the tank cannot directly enter the connecting pipe. A portion of the cryogenic liquid absorbs heat and vaporizes inside the capillaries within the capillary bundle, while another portion directly absorbs heat and vaporizes on the surface of the capillary bundle. Due to the pressure difference, most of the vaporized gas passes through the capillary bundle into the gas column between the capillary bundle and the valve in the connecting pipe, thus increasing the gas column pressure. The gas column pressure, combined with the additional pressure created by capillary action, forms a pressure difference with the cryogenic liquid in the tank, thereby preventing the cryogenic liquid from further entering the connecting pipe and preventing excessive vaporization of the cryogenic liquid.

[0033] Example 2

[0034] like Figure 3 As shown, in this example, the application scenario of the present invention is a single-tank cryogenic storage tank.

[0035] As shown in the diagram of capillary bundle installation. Figure 6 As shown, the capillary bundle fits into the inner wall of the connecting pipe.

[0036] When the storage tank is operating in its normal position, such as Figure 3 As shown, at this time, the cryogenic liquid level inside the tank is below the connecting pipe, and the cryogenic liquid does not submerge the connecting pipe.

[0037] When the working posture of the storage tank undergoes a significant deflection, such as a 90-degree deflection, ... Figure 4 As shown in the diagram, the cryogenic liquid level in the tank is submerged above the connecting pipe opening. Due to the presence of the capillary bundle, the cryogenic liquid cannot directly enter the connecting pipe. A portion of the cryogenic liquid absorbs heat and vaporizes within the capillaries of the capillary bundle, while another portion directly absorbs heat and vaporizes on the surface of the capillary bundle. Due to the pressure difference, most of the vaporized gas passes through the capillary bundle into the gas column between the capillary bundle and the connecting pipe valve, thus increasing the gas column pressure. The gas column pressure, combined with the additional pressure created by capillary action, forms a pressure difference with the cryogenic liquid in the tank, preventing further entry of the cryogenic liquid into the connecting pipe.

[0038] Therefore, when the posture of the cryogenic storage tank changes, the presence of the capillary bundle check valve prevents the cryogenic liquid from flowing back into the connecting pipe, thus improving the safety of the storage tank.

[0039] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A capillary bundle check valve for cryogenic storage tanks, comprising a cryogenic storage tank, connecting pipes, and a capillary bundle; The cryogenic storage tank includes an inner tank liner, an outer tank liner, and a heat insulation layer between the inner and outer tank liner; one end of the connecting pipe is connected to the inner tank liner, and the other end of the connecting pipe is connected to the outer tank liner; one end of the connecting pipe is connected to the inner tank liner, and the other end of the connecting pipe is exposed outside the tank; the capillary bundle is adapted to the connecting pipe, and the outer cylindrical surface of the capillary bundle matches the inner wall surface of the connecting pipe, so that the capillary bundle is disposed inside the connecting pipe, and the position of the capillary bundle is close to the inner tank liner.

2. The capillary bundle check valve for cryogenic storage tanks as described in claim 1, wherein the cryogenic storage tank comprises a tank liner and insulation material.

3. The capillary bundle check valve device for cryogenic storage tanks as described in claim 1, characterized in that: The capillary bundle is a column with capillaries evenly distributed inside, parallel to the axis of the column.

4. The capillary bundle check valve device for cryogenic storage tanks as described in claim 1, characterized in that: The capillary bundle has a surface contact angle greater than 90°, which gives it hydrophobic properties.

5. The capillary bundle check valve device for cryogenic storage tanks as described in claim 1, characterized in that... The connecting pipe is equipped with a valve in the section between the inner liner of the cryogenic storage tank and the outside of the tank to control the connection and disconnection between the inner liner of the cryogenic storage tank and the outside of the tank.

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