Liquid hydrogen well suspension supporting device

Abstract

The invention belongs to the technical field of hydrogen energy storage, and particularly relates to a liquid hydrogen well hanging and supporting device. The liquid hydrogen well hanging and supporting device is arranged at the bottom of an inner shaft, the inner shaft is located in an outer shaft, and the liquid hydrogen well hanging and supporting device comprises a load bearing support and a supporting rod, the multiple hanging ropes are evenly arranged in the circumferential direction of the bearing support, and the end, away from the bearing support, of each hanging rope is connected with the shaft wall of the outer shaft. The invention can reduce the loss of liquid hydrogen.

Description

Technical Field

[0001] The present invention belongs to the technical field of hydrogen energy storage, and in particular, relates to a liquid hydrogen well suspension support device. Background Art

[0002] Liquid hydrogen storage requires an ultra-low temperature environment (-253°C). Any heat penetration can cause the liquid hydrogen to absorb heat and vaporize, resulting in liquid hydrogen loss. Therefore, the liquid hydrogen storage system needs to have good insulation properties.

[0003] Among them, the heat transfer heat leakage of the support device of the liquid hydrogen storage system can account for more than 30% of the total heat leakage of the liquid hydrogen storage device. As a new type of underground liquid hydrogen storage container, the liquid hydrogen well has the advantages of small footprint, constant temperature, stable working environment, and high safety. According to the structural characteristics of the liquid hydrogen well itself, the support device generally adopts a top suspension, an intermediate centralizer or a bottom support device, among which the top suspension and the bottom support are the load-bearing devices of the wellbore in the liquid hydrogen well.

[0004] Since the weight of the wellbore in the liquid hydrogen well is relatively large, if only the top suspension is used, the load-bearing capacity is too large, which is not conducive to long-term safe operation, so the bottom support device is indispensable. Compared with the top suspension support device, the bottom support device has a larger heat conduction area and a smaller heat conduction distance, and the heat transfer and heat leakage are more serious, which is not conducive to the safe and efficient storage of liquid hydrogen.

[0005] Therefore, there is an urgent need to improve the bottom support device to reduce its heat transfer and heat leakage. Summary of the invention

[0006] In view of the technical problems mentioned above, the present invention aims to provide a liquid hydrogen well suspension support device, which can reduce the loss of liquid hydrogen.

[0007] According to the present invention, a liquid hydrogen well suspension support device is provided, which is arranged at the bottom of an inner wellbore, wherein the inner wellbore is located inside an outer wellbore, and the liquid hydrogen well suspension support device comprises:

[0008] A load-bearing bracket, the load-bearing bracket abuts against the lower end surface of the inner wellbore;

[0009] Suspension ropes, wherein a plurality of the suspension ropes are evenly arranged along the circumference of the load-bearing support, and an end of each of the suspension ropes away from the load-bearing support is connected to the wall of the outer wellbore.

[0010] In a preferred embodiment provided according to the present invention, the shape of the upper end surface of the load-bearing support is matched with the shape of the lower end surface of the inner wellbore.

[0011] In a preferred embodiment provided according to the present invention, the upper end surface of the load-bearing support and the lower end surface of the inner shaft are both configured as arc surfaces.

[0012] In a preferred embodiment provided according to the present invention, a heat insulation layer is provided on the upper surface of the load-bearing support.

[0013] In a preferred embodiment provided according to the present invention, a heat insulation layer is provided on the outer surface of the load-bearing support.

[0014] In a preferred embodiment provided according to the present invention, the thermal insulation layer includes at least one layer of nylon paper.

[0015] In a preferred embodiment provided according to the present invention, a reflective layer is provided on the lower surface of the load-bearing support.

[0016] In a preferred embodiment provided according to the present invention, the reflective layer includes at least one layer of aluminum foil.

[0017] In a preferred embodiment provided according to the present invention, the load-bearing bracket is made of glass fiber reinforced plastic material.

[0018] In a preferred embodiment provided according to the present invention, a gap is provided between the load-bearing support and the outer shaft.

[0019] Compared with the prior art, the present application has at least the following advantages.

[0020] The present invention uses a load-bearing support with a hanging rope to lift the bottom of the inner wellbore, thereby reducing the heat conduction area between the inner wellbore and the outer wellbore, increasing the heat conduction distance, reducing heat leakage of the hanging support device at the bottom of the inner wellbore, and reducing the evaporation of liquid hydrogen.

[0021] In addition, the suspension support device provided by the present invention is different from the conventional suspension support. The device has no direct mechanical connection with the inner wellbore. In the actual installation process, it is only necessary to set the load-bearing bracket in the outer wellbore through the suspension rope, then lower the outer wellbore into the well, and finally put the inner wellbore into the outer wellbore until the lower end of the inner wellbore abuts against the load-bearing bracket. The operation is simple and does not increase the difficulty of operation.

[0022] The present invention has a symmetrical structure, uniform force and stable structure, which not only retains the load-bearing function of conventional suspension supports, but also greatly reduces its heat leakage and heat transfer, and can ensure that liquid hydrogen wells can store liquid hydrogen safely and efficiently, promote the construction of liquid hydrogen wells, and promote the development of the hydrogen energy industry.

[0023] The inner side of the load-bearing bracket of the suspension support device provided by the present invention has a certain curvature, so that the contact between the inner wellbore and the load-bearing bracket is stable and not prone to sliding. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be described below with reference to the accompanying drawings.

[0025] Figure 1A schematic diagram showing an embodiment of a liquid hydrogen well suspension support device according to the present invention;

[0026] Figure 2 A schematic top view of an embodiment of a load-bearing bracket according to the present invention is shown;

[0027] Figure 3 A cross-sectional schematic diagram showing an embodiment of a load-bearing bracket according to the present invention;

[0028] Figure 4 A schematic diagram of a prior art bottom support is shown.

[0029] In the figure:

[0030] 1. Outer wellbore; 2. Insulating interlayer; 3. Inner wellbore; 4. Bottom support; 5. Top suspension; 6. Intermediate centralizer; 7. Load-bearing support; 8. Suspension rope; 9. Insulation layer; 10. Reflection layer; 100. Liquid hydrogen well suspension support device.

[0031] In the present application, all drawings are schematic drawings, which are only used to illustrate the principles of the present invention and are not drawn according to the actual scale. DETAILED DESCRIPTION

[0032] The present invention will be described below with reference to the accompanying drawings.

[0033] It should be noted that in the present application, the direction close to the wellhead after entering the well according to the present invention is described as "up", "front" or similar terms, while the direction away from the wellhead and deep into the formation is described as "down", "back" or similar terms. They are not used to limit the absolute positions of the components involved, but can be changed according to specific circumstances.

[0034] Figure 1 The structure of the liquid hydrogen well suspension support device 100 according to the present invention is shown.

[0035] like Figure 1 As shown, in this embodiment, the inner shaft 3 is configured as a cylindrical sealed tank with a cavity, serving as an inner tank for storing liquid hydrogen.

[0036] The outer wellbore 1 is fixed in the well, and the inner wellbore 3 is coaxially fixed inside the outer wellbore 1, and the outer diameter of the inner wellbore 3 is smaller than the inner diameter of the outer wellbore 1, so that there is a gap between the inner wellbore 3 and the outer wellbore 1, so that the inner wellbore 3 and the outer wellbore 1 are not in direct contact, thereby reducing heat conduction.

[0037] In a preferred embodiment, a heat insulating interlayer 2 is provided between the inner wellbore 3 and the outer wellbore 1 , and the heat insulating interlayer 2 can further block the heat transfer between the inner wellbore 3 and the outer wellbore 1 .

[0038] Among them, the material used for the thermal insulation interlayer 2 is a thermal insulation material commonly used in the prior art, which is not the technical point of the present invention and will not be described here.

[0039] Furthermore, an intermediate stabilizer 6 is provided on the middle outer wall of the inner wellbore 3 , the inner wellbore 3 is fixedly connected to the outer wellbore 1 through the intermediate stabilizer 6 , and the inner wellbore 3 remains coaxial with the outer wellbore 1 under the action of the intermediate stabilizer 6 .

[0040] Furthermore, a top suspension 5 is provided at the top of the inner shaft 3. The structure of the top suspension 5 is the same as that of the prior art, and will not be described in detail herein.

[0041] The liquid hydrogen well suspension support device 100 provided by the present invention is arranged at the bottom of the inner wellbore 3 , and the liquid hydrogen well suspension support device 100 includes a load-bearing bracket 7 and a suspension rope 8 .

[0042] like Figure 2 As shown, a plurality of suspension ropes 8 are provided, and the lengths of the suspension ropes 8 are all equal. The plurality of suspension ropes 8 are evenly distributed in a scattered manner along the circumferential direction of the load-bearing bracket 7, one end of each suspension rope 8 is fixedly connected to the load-bearing bracket 7, and the other end of each suspension rope 8 is connected to the well wall of the outer wellbore 1, so that the load-bearing bracket 7 is arranged inside the outer wellbore 1, and the central axis of the load-bearing bracket 7 coincides with the central axis of the outer wellbore 1.

[0043] In a preferred embodiment, the suspension rope 8 is made of high-strength and low-thermal conductivity material, which on the one hand ensures that the suspension rope 8 can provide sufficient upward support force for the load-bearing bracket 7, and on the other hand can reduce the heat conduction between the suspension rope 8 and the load-bearing bracket 7 and the outer wellbore 1.

[0044] In a specific embodiment, the load-bearing bracket 7 is made of glass fiber reinforced plastic material.

[0045] The load-bearing support 7 abuts against the lower end surface of the inner wellbore 3. After the load-bearing support 7 is arranged inside the outer wellbore 1 through a plurality of suspension ropes 8, the inner wellbore 3 enters the outer wellbore 1 from top to bottom until the lower end of the inner wellbore 3 abuts against the load-bearing support 7. The load-bearing support 7 provides an upward supporting force for the inner wellbore 3 to prevent the lower end of the inner wellbore 3 from abutting against the outer wellbore 1, thereby preventing heat conduction between the inner wellbore 3 and the outer wellbore 1.

[0046] In a preferred embodiment, the shape of the upper end surface of the bearing support 7 is adapted to the shape of the lower end surface of the inner shaft 3 .

[0047] In this embodiment, in order to make the upper end surface of the load-bearing bracket 7 fit with the lower end surface of the inner shaft 3, the upper end surface of the load-bearing bracket 7 and the lower end surface of the inner shaft 3 are both set to be arc surfaces.

[0048] Furthermore, the upper end surface of the load-bearing support 7 is configured as a downwardly concave arc surface, and the lower end surface of the inner wellbore 3 is configured as a downwardly convex arc surface.

[0049] By making the load-bearing support 7 match the inner wellbore 3 , the inner wellbore 3 can be automatically centered under the action of the load-bearing support 7 .

[0050] like Figure 3 As shown, in one embodiment of the present invention, a heat insulation layer 9 is provided on the upper surface of the load-bearing support 7 .

[0051] In another embodiment of the present invention, a heat insulating layer 9 is provided on the outer surface of the load bearing support 7 , that is, the heat insulating layer 9 completely wraps the load bearing support 7 .

[0052] By providing a heat insulating layer 9 on the load-bearing support 7, heat exchange between the inner wellbore 3 and the load-bearing support 7 is prevented, thereby reducing the loss of liquid hydrogen in the inner wellbore 3.

[0053] In a specific embodiment, the heat insulation layer 9 includes at least one layer of nylon paper. Multiple layers of nylon paper are sequentially arranged on the outer surface of the heat insulation layer 9 by bonding.

[0054] In a preferred embodiment, a reflective layer 10 is provided on the lower surface of the load-bearing bracket 7. Further, in an embodiment, a heat insulating layer 9 is provided on the outer surface of the load-bearing bracket 7, and then a reflective layer 10 is provided on the lower end surface of the heat insulating layer 9.

[0055] By providing the reflective layer 10 , the heat radiation from the outer wellbore 1 can be reflected, thereby reducing the loss of liquid hydrogen in the inner wellbore 3 .

[0056] In a specific embodiment, the reflective layer 10 includes at least one layer of aluminum foil.

[0057] It should be noted that, although the thermal insulation layer 9 in this embodiment is set as nylon paper and the reflective layer 10 is set as aluminum foil, the thermal insulation layer 9 of the present invention is not limited to nylon paper, and the reflective layer 10 is not limited to aluminum foil. All materials that can insulate in the prior art can be used as the thermal insulation layer 9 of the present invention, and all materials that can reflect thermal radiation in the prior art can be used as the reflective layer 10 of the present invention.

[0058] The liquid hydrogen well suspension support device 100 of the present invention is described below in combination with actual conditions.

[0059] like Figure 1 As shown, the outer shaft 1 in this embodiment has an inner diameter of 500 mm and is made of large-diameter steel. An insulating interlayer 2 is provided on the inner wall of the outer shaft 1 .

[0060] The inner wellbore 3 is a small-sized inner wellbore with an outer diameter of 350 mm. The inner wellbore 3 is a liquid hydrogen storage casing and is arranged inside the thermal insulation interlayer 2. The working temperature of the inner wellbore 3 is maintained below -253°C.

[0061] In order to firmly fix the inner wellbore 3 in the outer wellbore 1 and at the same time avoid heat transfer and heat leakage caused by direct contact between the inner wellbore 3 and the outer wellbore 1, a top suspension 5 is arranged at the top of the inner wellbore 3 and the outer wellbore 1, an intermediate stabilizer 6 (support between the well walls of the inner wellbore 3 and the outer wellbore 1) is arranged in the middle of the inner wellbore 3 and the outer wellbore 1, and a liquid hydrogen well suspension support device 100 is arranged at the bottom of the inner wellbore 3 and the outer wellbore 1. The top suspension 5 and the liquid hydrogen well suspension support device 100 are the main load-bearing structures.

[0062] Among them, the technical features of the top suspension 5 and the intermediate stabilizer 6 are the same as those of the prior art, which are not the technical points of the present invention and will not be repeated here.

[0063] like Figure 2 As shown, the liquid hydrogen well suspension support device 100 includes eight suspension ropes 8 and a load-bearing bracket 7. The eight suspension ropes 8 have the same length and are evenly distributed along the circumferential direction of the load-bearing bracket 7. One end of the suspension rope 8 is fixed to the inner wall of the outer wellbore 1, and the other end is fixed to the side of the load-bearing bracket 7. The suspension rope 8 is made of high-strength and low-thermal conductivity material. In order to ensure uniform force and structural stability, the eight ropes are evenly distributed on the inner side of the outer wellbore and the height is kept consistent.

[0064] It is easy to understand that the high-strength and low-thermal-conductivity materials used to make the suspension rope 8 are prior art and are not the technical key points of the present invention, and will not be described in detail here.

[0065] It should be noted that, although the present embodiment adopts eight suspension ropes 8, the present invention is not limited to this setting number, that is, the number of suspension ropes 8 is not limited to eight. The technicians in this field can change the setting number of suspension ropes according to the actual needs, and such changes should be within the protection scope of the present invention.

[0066] like Figure 3 As shown, in one embodiment, the upper portion of the load-bearing bracket 7 is in direct contact with the inner wellbore 3, and the load-bearing bracket 7 is made of glass fiber reinforced plastic with high strength and low thermal conductivity.

[0067] It is easy to understand that the fiberglass material with high strength and low thermal conductivity is the prior art, and its specific composition is not the technical point of the present invention and will not be described in detail here.

[0068] In this embodiment, the load-bearing support 7 is configured as a disc shape as a whole, and an arc surface with a certain concave curvature is provided on the axial upper end surface of the load-bearing support 7, and the lower end surface of the inner wellbore 3 is also configured as an arc surface, which can prevent the inner wellbore 3 from sliding.

[0069] In a preferred embodiment, the portion of the load-bearing support 7 that contacts the inner shaft 3 is wrapped with multiple layers of nylon paper with good thermal insulation properties as a thermal insulation layer 9, which can reduce heat conduction between the load-bearing support 7 and the inner shaft 3.

[0070] In a preferred embodiment, the side of the load-bearing bracket 7 close to the outer shaft 1, that is, the lower end surface of the load-bearing bracket 7 is not only wrapped with multiple layers of nylon paper, but also wrapped with aluminum foil on the lower end surface of the nylon paper. The aluminum foil can be used to reflect the heat radiation of the outer shaft 1 and reduce the radiation heat transfer on the high-temperature side.

[0071] Research shows that the heat leakage of the support structure in the liquid hydrogen storage container can account for more than 30% of the total heat leakage of the system. Reducing the heat leakage of the support device can effectively reduce the total heat leakage of the liquid hydrogen storage container and reduce the evaporation loss of liquid hydrogen. Among them, the heat transfer of the support structure is solid heat conduction, and its formula is:

[0072] Φ=(λ×A×ΔT) / l

[0073] In the formula:

[0074] Ф represents the heat transfer of the supporting structure, W;

[0075] λ is the thermal conductivity of the support device, W / (m·K);

[0076] A is the heat conduction area of ​​the support device, m 2 ;

[0077] l is the heat conduction length of the support device, m;

[0078] ΔT represents the temperature difference between the high temperature side and the low temperature side, K.

[0079] It can be seen from the formula that the heat transfer Φ is proportional to λ, A and ΔT, and inversely proportional to l, where ΔT is basically a fixed value, λ is related to the inherent properties of the material, and A and l are related to the structural design of the support device. The total heat transfer of the support device can be reduced by reducing the heat conduction area (A) of the support device and increasing the heat conduction length (l).

[0080] Figure 4 A schematic diagram of a bottom support in the prior art is shown, Figure 4 As shown, the conventional bottom support 4 adopts a glass fiber reinforced plastic block structure, and the upper and lower ends are fixedly connected to the inner shaft 3 and the outer shaft 1 respectively, which has the disadvantages of large heat conduction area and short heat conduction distance.

[0081] The present invention converts the traditional bottom support 4 into a liquid hydrogen well suspension support device 100 through structural design, and the heat conduction area of ​​the suspension rope 8 is much smaller than the conventional bottom support 4. In addition, the length of the suspension rope 8 can be replaced with other lengths, and the heat conduction length can be effectively increased by adjusting the length of the suspension rope 8. According to estimates, the liquid hydrogen well suspension support device 100 provided by the present invention can reduce the heat transfer of the bottom support 4 by more than 90% compared with the traditional bottom support 4, thereby effectively reducing the vaporization of liquid hydrogen caused by the heat conduction of the support device.

[0082] In addition, the depth of the hydrogen storage well is about 100 to 200 meters, and the diameter of the outer wellbore 1 is only 500 mm, which makes the bottom operation difficult. The liquid hydrogen well suspension support device 100 provided by the present invention can be fixed on the inner wall of the outer wellbore 1 before the outer wellbore 1 enters the well, which is convenient for subsequent installation. At the same time, there is no mechanical connection structure between the liquid hydrogen well suspension support device 100 and the inner wellbore 3, and no additional related operations are added, which has the advantage of simple operation.

[0083] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0084] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0085] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0086] Finally, it should be noted that the above is only a preferred embodiment of the present invention and does not constitute any limitation to the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A liquid hydrogen well suspension support device, arranged at the bottom of an inner wellbore (3), wherein the inner wellbore (3) is located inside an outer wellbore (1), characterized in that: The liquid hydrogen well suspension support device comprises: A load-bearing support (7), the load-bearing support (7) abutting against the lower end surface of the inner wellbore (3); Suspension ropes (8), wherein a plurality of the suspension ropes (8) are evenly arranged along the circumference of the load-bearing bracket (7), and an end of each of the suspension ropes (8) away from the load-bearing bracket (7) is connected to the wall of the outer wellbore (1).

2. The liquid hydrogen well suspension support device according to claim 1, characterized in that: The shape of the upper end surface of the load-bearing support (7) is adapted to the shape of the lower end surface of the inner wellbore (3).

3. The liquid hydrogen well suspension support device according to claim 2, characterized in that: The upper end surface of the load-bearing support (7) and the lower end surface of the inner wellbore (3) are both configured as arc surfaces.

4. The liquid hydrogen well suspension support device according to claim 1, characterized in that: A heat insulation layer (9) is provided on the upper surface of the load-bearing bracket (7).

5. The liquid hydrogen well suspension support device according to claim 1, characterized in that: A heat insulation layer (9) is provided on the outer surface of the load-bearing bracket (7).

6. The liquid hydrogen well suspension support device according to claim 4 or 5, characterized in that: The heat insulation layer (9) comprises at least one layer of nylon paper.

7. The liquid hydrogen well suspension support device according to claim 1, characterized in that: A reflective layer (10) is provided on the lower surface of the load-bearing bracket (7).

8. The liquid hydrogen well suspension support device according to claim 7, characterized in that: The reflective layer (10) comprises at least one layer of aluminum foil.

9. The liquid hydrogen well suspension support device according to claim 1, characterized in that: The load-bearing bracket (7) is made of glass fiber reinforced plastic material.

10. The liquid hydrogen well suspension support device according to claim 1, characterized in that: A gap is provided between the load-bearing support (7) and the outer shaft (1).

Images