Low-temperature storage tank

Abstract

The low-temperature storage tank comprises a tank body, a foundation platform, a liquid outlet pipe and a heat preservation piece, the foundation platform is arranged at the bottom of the tank body to support the tank body, a containing groove is formed in the top of the foundation platform, an opening is formed in the top of the containing groove, and the containing groove extends to the edge of one side of the foundation platform and is provided with an opening. The liquid outlet pipe is connected with the liquid outlet in the bottom of the tank body and penetrates through the containing groove to extend to one side of the foundation bearing platform, so that low-temperature liquid in the low-temperature storage tank can be completely discharged through the liquid outlet pipe, and the low-temperature liquid in the low-temperature storage tank can be completely discharged through the liquid outlet pipe. In addition, the heat preservation piece can be more conveniently filled in the containing groove so as to wrap the periphery of the liquid outlet pipe.

Description

Technical Field

[0001] The utility model relates to the field of storage tanks, and mainly relates to a low-temperature storage tank. Background Art

[0002] In recent years, the cryogenic liquid market has become increasingly prosperous, and the sales of cryogenic liquids such as liquid oxygen, liquid argon, liquid nitrogen, liquid carbon dioxide, and LNG natural gas have increased significantly. The production and storage of cryogenic liquids are inseparable from cryogenic storage tanks, which are installed and used in large quantities.

[0003] At present, the conventional way to discharge liquid from the bottom of a cryogenic storage tank is vertical discharge. This method requires pre-embedded casing in the foundation pedestal of the storage tank. The casing needs to penetrate the pedestal in the vertical direction. The subsequent tank discharge pipe is led out from the inner tank storing the liquid, and passes through the casing and turns out at the bottom of the foundation pedestal. Among them, the casing has a large diameter and penetrates the foundation vertically, which destroys the structural integrity of the foundation pedestal and affects the bearing capacity of the foundation pedestal. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, an object of the present utility model is to provide a low-temperature storage tank, which can prevent the structural integrity of the foundation pedestal from being destroyed due to the pre-buried casing.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A low-temperature storage tank comprises a tank body, a base support, a liquid outlet pipe and a thermal insulation component, wherein the tank body is used to store low-temperature liquid; a liquid outlet hole is provided at the bottom of the tank body; the base support is arranged at the bottom of the tank body to support the tank body; a receiving groove is provided on the top of the base support, the top of the receiving groove is open, and the receiving groove extends to one side edge of the base support and is open; the liquid outlet pipe is passed through the receiving groove; one end of the liquid outlet pipe is connected to the liquid outlet hole, and the other end extends to pass through the receiving groove; the thermal insulation component is arranged in the receiving groove and covers the outer periphery of the liquid outlet pipe.

[0007] In some schemes of the present application, the cryogenic storage tank further includes a mounting member, which is disposed in the containing groove and connected to the tank body, the mounting member is hollow inside and open at both ends, and the liquid outlet pipe is passed through the mounting member.

[0008] In some schemes of the present application, the tank body includes an outer tank bottom plate arranged on the top of the base support and an inner tank bottom plate arranged above the outer tank bottom plate, the liquid outlet is arranged on the inner tank bottom plate, and a notch is opened on the outer tank bottom plate, the notch corresponds to the opening of the accommodating groove, the edge of the notch is connected to the outer peripheral wall of the mounting member, and the liquid outlet pipe portion is located between the outer tank bottom plate and the inner tank bottom plate.

[0009] In some schemes of the present application, the cross-section of the mounting member is arc-shaped, with its convex surface facing the base support; both ends of the cross-section of the mounting member are disconnected, and the top of the mounting member is connected to the bottom plate of the outer tank to close the gap.

[0010] In some schemes of the present application, the tank body also includes an inner cylinder and an outer cylinder, the inner cylinder is arranged on the inner tank bottom plate and forms a space for storing the low-temperature liquid with the inner tank bottom plate, and the outer cylinder is arranged on the outer tank bottom plate; a through hole is opened at the lower part of the outer cylinder, and the liquid outlet pipe passes through the through hole and extends to the outside of the outer cylinder.

[0011] In some schemes of the present application, the tank body also includes a first insulation layer and a second insulation layer, the first insulation layer is arranged between the inner tank bottom plate and the outer tank bottom plate; an interlayer is formed between the inner cylinder and the outer cylinder, and the second insulation layer is arranged in the interlayer.

[0012] In some schemes of the present application, the cryogenic storage tank further comprises a telescopic compensator, which is sleeved on the liquid outlet pipe and fixedly connected to the outer cylinder and the liquid outlet pipe respectively; the telescopic compensator is at least partially located on the outside of the outer cylinder.

[0013] In some schemes of the present application, the liquid outlet pipe includes a horizontal section and a vertical section, one end of the horizontal section is located in the containing tank, and the other end extends to the outside of the containing tank, the lower end of the vertical section is connected to the horizontal section, and the upper end of the vertical section is connected to the liquid outlet hole.

[0014] In some schemes of the present application, the upper end of the vertical section is inserted into the liquid outlet hole, and the liquid outlet pipe is welded to the inner tank bottom plate; the weld between the vertical section and the inner tank bottom plate is arranged on the side of the inner tank bottom plate away from the foundation support platform.

[0015] In some embodiments of the present application, the inner tank bottom plate is provided with a slope at the side wall of the liquid outlet hole, and a weld between the vertical section and the inner tank bottom plate is formed between the slope and the outer surface of the vertical section; and / or the cryogenic storage tank further includes an anti-vortex device, which is fixed on the inner tank bottom plate, and one end of the anti-vortex device is inserted into the liquid outlet pipe; the anti-vortex device is fixedly welded to the inner tank bottom plate, and the weld between the anti-vortex device and the inner tank bottom plate is arranged on the side of the inner tank bottom plate away from the foundation platform; and / or the cryogenic storage tank further includes an emergency valve, which includes an actuator, a valve body and a valve core. The valve body is arranged above the liquid outlet hole, the valve core is movably arranged in the valve body, the actuator is arranged on the top of the outer cylinder and is connected to the valve core, and the actuator can drive the valve core to block the liquid outlet hole and drive the valve core to separate from the liquid outlet hole to control the on-off of the liquid outlet pipe.

[0016] Beneficial effects: The cryogenic storage tank of the present application includes a tank body, a foundation platform, a liquid outlet pipe and a heat preservation member. The foundation platform is arranged at the bottom of the tank body to support the tank body. The top of the foundation platform is provided with a receiving groove, the top of the receiving groove is open, and the receiving groove extends to one side edge of the foundation platform and is open, that is, the receiving groove does not penetrate the foundation platform. Therefore, the overall bearing capacity of the foundation platform can be ensured not to be damaged. The liquid outlet pipe is connected to the liquid outlet of the bottom of the tank body and passes through the receiving groove to extend to one side of the foundation platform, so that the liquid outlet pipe can drain all the cryogenic liquid in the cryogenic storage tank, and it is more convenient to fill the heat preservation member in the receiving groove to cover the outer circumference of the liquid outlet pipe. Description of the Drawings

[0017] Figure 1 is a schematic cross-sectional structure view of a cryogenic storage tank in an embodiment.

[0018] Figure 2 is Figure 1 a partial cross-sectional view taken at A-A.

[0019] Figure 3 is Figure 1 a schematic connection structure view between the liquid outlet pipe, the inner tank bottom plate and the anti-vortex device of the cryogenic storage tank shown.

[0020] Figure 4 is a front view structure schematic diagram of the mounting member.

[0021] Figure 5 is a right view structure schematic diagram of the mounting member.

[0022] Figure 6 is a top view structure schematic diagram of the mounting member.

[0023] Figure 7It is a schematic structural diagram of the liquid outlet pipe.

[0024] Description of main component symbols:

[0025] 1 - Tank body; 11 - Outer tank bottom plate; 12 - Inner tank bottom plate; 13 - Inner cylinder; 14 - Outer cylinder; 15 - First insulation layer; 16 - Second insulation layer; 2 - Foundation cap; 21 - Accommodating groove; 3 - Liquid outlet pipe; 31 - Horizontal section; 32 - Vertical section; 4 - Insulation part; 5 - Mounting part; 6 - Emergency valve; 7 - Anti - vortex device; 8 - Expansion compensator. Specific implementation mode

[0026] The present utility model provides a cryogenic storage tank. To make the purpose, technical solution and effects of the present utility model clearer and more definite, the following further details the present utility model with reference to the accompanying drawings and by way of examples. It should be understood that the specific examples described herein are only used to explain the present utility model and are not used to limit the protection scope of the present utility model.

[0027] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0028] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", "connected" 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, an electrical connection or can communicate with each other; it can be a direct connection, or indirectly connected through an intermediate medium, and can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0029] This application provides a cryogenic storage tank, which adopts a side liquid outlet method, and ensures the structural integrity of the foundation cap and the safety of the cryogenic storage tank.

[0030] Refer to Figure 1 and Figure 2, the cryogenic storage tank includes a tank body 1, a foundation bearing platform 2, a liquid outlet pipe 3 and a heat preservation member 4. A receiving groove 21 is provided at the top of the foundation bearing platform 2. The receiving groove 21 has an open top, and the receiving groove 21 extends to one side edge of the foundation bearing platform 2 and is open. The liquid outlet pipe 3 is disposed through the receiving groove 21. One end of the liquid outlet pipe 3 is connected to the liquid outlet hole of the tank body 1, and the other end extends out of the receiving groove 21. The heat preservation member 4 is wrapped around the outer periphery of the liquid outlet pipe 3 and is at least partially disposed in the receiving groove 21.

[0031] The cryogenic storage tank realizes the side liquid outlet mode of the tank body by arranging the receiving groove 21 at the top of the foundation bearing platform 2 and communicating with one side surface of the foundation bearing platform 2, and arranging the liquid outlet pipe 3 in the receiving groove 21. By arranging the receiving groove 21 at the top of the foundation bearing platform 2, compared with the way of vertically penetrating the foundation bearing platform 2, the present application can ensure that the overall bearing capacity of the foundation bearing platform 2 is not damaged.

[0032] The foundation bearing platform 2 is of a reinforced concrete structure and is built on the ground for supporting the tank body 1. The shape of the foundation bearing platform 2 is adapted to the bottom shape of the tank body 1. When building the foundation bearing platform 2, a receiving groove 21 is preset on the top surface of the foundation bearing platform 2. The receiving groove 21 has an open top, and the receiving groove 21 extends to one side edge of the foundation bearing platform 2 and is open, that is, the receiving groove 21 forms a downward concave cavity and communicates with the peripheral side of the foundation bearing platform 2 to form a horizontal groove. The "horizontal" here is not limited to being absolutely parallel to the horizontal plane, and can also have a small angle with the horizontal plane, that is, there can be a certain construction error.

[0033] The cross section of the receiving groove 21 is in an arc shape, so as to ensure that the distance between the inner wall of the receiving groove 21 and the liquid outlet pipe 3 is equal or close, and reduce the volume of the reserved receiving groove 21, and further make the overall volume of the foundation bearing platform 2 larger, ensuring that the overall bearing capacity of the foundation bearing platform 2 is not damaged. In other embodiments, the cross section of the receiving groove 21 can also be a polygonal structure.

[0034] The top surface area of the foundation bearing platform 2 is greater than or equal to the projected area of the tank body 1 in the top view direction, and the projected area of the tank body 1 in the top view direction is within the range of the top surface of the foundation bearing platform 2, so that when the tank body 1 is fixed on the top surface of the foundation bearing platform 2, the foundation bearing platform 2 plays a supporting role on each position of the bottom of the tank body 1, improving the stability of the cryogenic storage tank.

[0035] The tank body 1 includes an outer tank bottom plate 11, an inner tank bottom plate 12, an inner cylinder 13 and an outer cylinder 14. The outer tank bottom plate 11 is fixed on the top of the foundation pile cap 2. The inner tank bottom plate 12 is arranged at an interval above the outer tank bottom plate 11. The lower end of the inner cylinder 13 is connected to the inner tank bottom plate 12, and a cavity for storing cryogenic liquid is formed, that is, the inner cylinder 13 and the inner tank bottom plate 12 form the inner tank of the cryogenic storage tank. The lower part of the outer cylinder 14 is connected to the outer tank bottom plate 11, and the outer cylinder 14 and the outer tank bottom plate 11 form a structure surrounding the inner tank bottom plate 12 and the inner cylinder 13, so as to play a role in protecting and heat insulating the inner tank formed by the inner tank bottom plate 12 and the inner cylinder 13, that is, the outer cylinder 14 and the outer tank bottom plate 11 form the outer tank of the cryogenic storage tank.

[0036] Among them, the inner cylinder 13 and the inner tank bottom plate 12 are connected by welding, so that the inner cylinder 13 and the inner tank bottom plate 12 are fixed together. Moreover, the inner cylinder 13 and the inner tank bottom plate 12 form a sealed cavity, and the connection is convenient. The outer cylinder 14 and the outer tank bottom plate 11 are also connected by welding, so that the outer cylinder 14 and the outer tank bottom plate 11 are fixed together and surround the inner tank bottom plate 12 and the inner cylinder 13.

[0037] A perforation is provided in the lower part of the outer cylinder 14, and the position of the perforation corresponds to the side opening position of the accommodating groove 21. A notch ( Figure 2 corresponding to the position of the mounting member 5 therein) is provided on the outer tank bottom plate 11. The notch is located above the accommodating groove 21 and corresponds to the position of the accommodating groove 21. The liquid outlet hole is arranged on the inner tank bottom plate 12 and is located above the accommodating groove 21 and the notch. With such a setting, the liquid outlet pipe 3 can pass through the perforation, the accommodating groove 21 and the notch and be connected to the liquid outlet hole, and the liquid outlet pipe 3 can be connected to the bottom of the tank body 1 and extend to the outside of the accommodating groove 21.

[0038] The tank body 1 further includes a first heat insulation layer 15. The first heat insulation layer 15 is arranged between the inner tank bottom plate 12 and the outer tank bottom plate 11. The material of the first heat insulation layer 15 is preferably foam glass brick. The foam glass brick has a supporting ability and can support the inner tank bottom plate 12, so that there is an interval distance between the inner tank bottom plate 12 and the outer tank bottom plate 11. The foam glass brick also has a heat insulation ability to realize the heat insulation function of the cryogenic storage tank. In other embodiments, a heat insulation connecting seat can also be arranged between the inner tank bottom plate 12 and the outer tank bottom plate 11. The heat insulation connecting seat is fixed on the outer tank bottom plate 11 and supports the inner tank bottom plate 12, so that there is an interval distance between the inner tank bottom plate 12 and the outer tank bottom plate 11.

[0039] The size of the inner cylinder 13 is smaller than that of the outer cylinder 14, so that there is a sandwich layer formed between the inner cylinder 13 and the outer cylinder 14. The tank body 1 further includes a second thermal insulation layer 16, and the second thermal insulation layer 16 is arranged in the sandwich layer between the inner cylinder 13 and the outer cylinder 14 to improve the thermal insulation performance of the cryogenic storage tank. The second thermal insulation layer 16 is preferably perlite sand. The perlite sand is filled in the sandwich layer between the inner cylinder 13 and the outer cylinder 14 and is filled solidly. The perlite sand has a good thermal insulation effect, and thus can improve the thermal insulation performance of the cryogenic storage tank. In other embodiments, the second thermal insulation layer 16 can also be insulating cotton.

[0040] The liquid outlet pipe 3 passes through the notch and the accommodation groove 21 on the outer tank bottom plate 11, and one end is connected to the liquid outlet hole on the inner tank bottom plate 12, and the other end extends to the outside of the accommodation groove 21, so that the liquid outlet pipe can communicate the inside of the tank body with external equipment.

[0041] Refer to Figure 1 and Figure 7 , in an embodiment, the liquid outlet pipe 3 includes a horizontal section 31 and a vertical section 32. The axis of the horizontal section 31 extends in the horizontal direction, and one end of the horizontal section 31 is located in the accommodation groove 21, and the other end extends to the outside of the outer cylinder 14. The axis of the vertical section 32 extends in the vertical direction, and the lower end of the vertical section 32 communicates with the horizontal section 31, and the upper end of the vertical section 32 communicates with the liquid outlet hole, so that the liquid outlet pipe 3 can communicate the liquid outlet hole and extend to the outside of the foundation platform 2 through the accommodation groove 21. Preferably, there is an arc transition between the horizontal section 31 and the vertical section 32 to reduce the fluid resistance of the liquid outlet pipe 3.

[0042] The upper end of the vertical section 32 is inserted into the liquid outlet hole, and the vertical section 32 is connected to the inner tank bottom plate 12 by welding. Among them, the weld between the liquid outlet pipe 3 and the inner tank bottom plate 12 is arranged on the side of the inner tank bottom plate 12 facing away from the foundation platform 2. The space on this side is large, which is convenient for welding and reduces the working difficulty. Compared with the existing scheme with the liquid outlet pipe 3 arranged vertically, the scheme of this embodiment can weld between the liquid outlet pipe 3 and the inner tank bottom plate 12 on the outside of the accommodation groove, that is, weld between the liquid outlet pipe 3 and the inner tank bottom plate 12 inside the tank body. Thus, the accommodation groove can be set smaller, and the problem of the reduced bearing capacity of the foundation platform 2 caused by opening a pipe passage on the foundation platform 2 can be avoided.

[0043] In Figure 3 the shown embodiment, the inner tank bottom plate 12 forms a slope at the liquid outlet hole, so that the diameter of the upper end of the liquid outlet hole is larger than that of the lower end of the liquid outlet hole. The diameter of the lower end of the liquid outlet hole is adapted to the diameter of the liquid outlet pipe 3. A weld for filling solder is formed between the upper wall surface of the liquid outlet hole and the outer wall surface of the liquid outlet pipe 3. Thus, butt welding is formed between the inner tank bottom plate 12 and the liquid outlet pipe 3. Moreover, during welding, welding can be carried out from the side of the inner tank bottom plate 12 facing away from the foundation platform 2, which makes welding convenient and the solder will not fall between the liquid outlet pipe 3 and the lower end of the liquid outlet hole, ensuring the welding quality.

[0044] In other embodiments, the end of the liquid outlet pipe 3 is higher than the upper surface of the inner tank bottom plate 12, so that an included angle is formed between the liquid outlet pipe 3 and the inner tank bottom plate 12, and then fillet welding is carried out at the included angle, making the welding convenient.

[0045] The weld between the liquid outlet pipe 3 and the inner tank bottom plate 12 is subjected to 100% RT inspection in accordance with the industry standard NB / T47013.2-2015. It is required that the radiographic inspection technology level is not lower than level AB, and the qualified level is not lower than level II.

[0046] The heat preservation member 4 is wrapped around the outer periphery of the liquid outlet pipe 3 and is located in the accommodation groove 21 to prevent cold leakage at the liquid outlet pipe 3 and improve the heat preservation effect of the cryogenic storage tank. When filling the heat preservation member 4, the material of the heat preservation member 4 can be filled along the horizontal direction. Compared with the prior art solution with the liquid outlet pipe arranged vertically, the filling difficulty of the material of the heat preservation member 4 is reduced, and the material of the heat preservation member 4 can be compacted, avoiding the problem of cold leakage and the phenomenon of cold leakage and frosting during the subsequent normal operation of the storage tank.

[0047] The temperature of the cryogenic liquid is lower than minus 100 degrees Celsius, and the lowest limit temperature that the foundation cap can bear is minus 40 - 50 °C, that is, the temperature of the cryogenic liquid is lower than the lowest limit temperature that the foundation cap can bear. Through the setting of the heat preservation member 4, it is avoided that the temperature of the cryogenic liquid is transmitted to the foundation cap, resulting in the failure of the material of the foundation cap.

[0048] In a preferred embodiment, the material of the heat preservation member 4 is preferably heat preservation cotton. The heat preservation cotton has compressible and resilient properties, and can be conveniently installed in the accommodation groove 21. That is, after the heat preservation cotton is installed in the accommodation groove 21, the heat preservation cotton can automatically rebound to be closely attached to the accommodation groove 21 and the liquid outlet pipe 3. Among them, the heat preservation cotton needs to be compressed by 50%, and the heat preservation cotton meets the requirements of a thermal conductivity < 0.037 W / (m·K) (data measured at 10 °C), a moisture content ≤ 0.2%, and non-combustibility. In other embodiments, the heat preservation member 4 can also be perlite sand.

[0049] Preferably, the axis of the horizontal section 31 of the liquid outlet pipe 3 is at the same position as the center of the arc surface of the accommodation groove 21, so that the distance between the horizontal section 31 and the inner wall surface of the accommodation groove 21 is equal, and then the thickness of the heat preservation member 4 outside the liquid outlet pipe 3 is uniform, improving the heat preservation and insulation effect and making the structure more reasonable.

[0050] In one embodiment, the heat preservation member 4 can also be arranged in the accommodation groove 21 in the following way: when producing the cryogenic storage tank, first place the liquid outlet pipe 3 in the accommodation groove 21, then fill the material of the heat preservation member 4, and then lay the inner tank bottom plate 12. This process sequence enables the material of the heat preservation member 4 to be filled from top to bottom during filling, making the construction convenient and easily compacting the heat preservation member 4, avoiding the phenomenon of cold leakage and frosting during the subsequent normal operation of the storage tank.

[0051] Refer to Figure 1 and Figure 2 Furthermore, the cryogenic storage tank further includes a mounting member 5, which is arranged in the accommodating groove 21, connected to the outer tank bottom plate 11 and the outer cylinder 14, and seals the notch on the outer tank bottom plate 11, so that the outer tank bottom plate 11, the mounting member 5 and the outer cylinder 14 form a completely enclosed outer tank, completely wrapping the inner tank formed by the inner tank bottom plate 12 and the inner cylinder 13 inside the outer tank, and forming a multi-layer heat insulation structure with the heat insulation member 4, improving the heat insulation effect of the cryogenic storage tank and preventing the cold of the cryogenic liquid from being transferred to the foundation platform 2, resulting in the material failure of the foundation platform 2.

[0052] Preferably, the edge of the notch is connected to the outer peripheral wall of the mounting member 5, and part of the liquid outlet pipe 3 is located between the outer tank bottom plate 11 and the inner tank bottom plate 12, and part is located in the accommodating groove 21, so that the depth of the accommodating groove 21 can be reduced, that is, the accommodating groove 21 is arranged on the surface of the foundation platform 2, and thus the overall bearing capacity of the foundation platform 2 is not damaged.

[0053] The mounting member 5 is hollow inside and open at both ends. The liquid outlet pipe 3 passes through the mounting member 5, and the heat insulation member 4 is arranged inside the mounting member 5, so that the heat insulation member 4 can wrap the liquid outlet pipe 3, facilitating the occurrence of cold leakage at the liquid outlet pipe 3.

[0054] Refer to Figure 4 、 Figure 5 and Figure 6 In a preferred embodiment, the cross-section of the mounting member 5 is arc-shaped, with its convex surface facing the foundation platform 2, and a space for accommodating the liquid outlet pipe 3 and the heat insulation member 4 is formed between the concave surface of the mounting member 5 and the inner tank bottom plate 12. That is to say, the space for passing the liquid outlet pipe 3 is formed inside the mounting member 5 and the interval gap between the outer tank bottom plate 11 and the inner tank bottom plate 12, so that the depth of the accommodating groove 21 can be reduced, and thus the overall bearing capacity of the foundation platform 2 is not damaged.

[0055] Both ends of the cross-section of the mounting member 5 are disconnected, that is, the top surface of the mounting member 5 is open, making both ends of the cross-section of the mounting member 5 in a disconnected shape. The top of the mounting member 5 is connected to the outer tank bottom plate 11 to seal the notch. Preferably, the cross-section of the mounting member 5 is circular arc-shaped, and the arc is less than or equal to a semi-circle, that is, the shape of the mounting member 5 is adapted to the shape of the accommodating groove 21, and the convex surface of the mounting member 5 fits with the inner wall surface of the accommodating groove 21, so that the foundation platform 2 exerts a greater supporting force on the mounting member 5, and thus the mounting member 5 is not easily damaged. Among them, when there is a gap between the convex surface of the mounting member 5 and the inner wall surface of the accommodating groove 21, cement slurry can be filled between the convex surface of the mounting member 5 and the inner wall surface of the accommodating groove 21 to make the two fit completely.

[0056] Preferably, the arc-shaped top surface of the mounting member 5 is hermetically connected to the edge of the notch, so that the mounting member 5, the outer tank bottom plate 11 and the outer cylinder 14 form a closed cavity, and there are no redundant corners at the connection between the mounting member 5 and the outer tank bottom plate 11, which is convenient for filling the material of the heat insulation member 4. In other embodiments, the width dimension of the top of the mounting member 5 can be greater than the width dimension of the notch. After the mounting member 5 is hermetically connected to the outer tank bottom plate 11, the notch on the outer tank bottom plate 11 can also be closed.

[0057] The material of the mounting member 5 is a metal material, so that the mounting member 5 can be connected to the outer tank bottom plate 11 and the outer cylinder 14 by welding, which is convenient for forming a sealed cavity. The mounting member 5 is preferably made of stainless steel material. The stainless steel material is a low-temperature resistant metal, which can be welded and can also resist low temperature, avoiding the cold of the low-temperature liquid being transferred to the mounting member 5 through heat radiation and heat transfer, resulting in the failure of the material of the mounting member 5.

[0058] In one embodiment, the welds between the mounting member 5, the outer tank bottom plate 11 and the outer cylinder 14 are subjected to 100% MT inspection in accordance with the industry standard NB / T47013.4-2015 and reach Class I qualification.

[0059] In other embodiments, the cross-section of the mounting member 5 can also be circular or polygonal. In this embodiment, the liquid outlet pipe 3 passes through the inside of the mounting member 5 as a whole, and the heat insulation member 4 is arranged between the outer wall surface of the liquid outlet pipe 3 and the inner wall surface of the mounting member 5.

[0060] The cryogenic storage tank further includes an expansion compensator 8. The expansion compensator 8 is sleeved on the liquid outlet pipe 3 and is fixedly connected to the outer cylinder 14 and the liquid outlet pipe 3 respectively. The cryogenic storage tank contains cryogenic liquid. Under the action of the cryogenic liquid, the closed structure formed by the inner cylinder 13 and the inner tank bottom plate 12 will shrink towards the center of the cryogenic storage tank. Since the liquid outlet pipe 3 is fixedly connected to the inner tank bottom plate 12, the liquid outlet pipe 3 will also shrink. Therefore, through the setting of the expansion compensator 8, the liquid outlet pipe 3 can maintain a sealed connection with the outer cylinder 14 during expansion and contraction, thereby maintaining the stability of the storage tank.

[0061] The expansion compensator 8 is preferably a bellows. The first end of the bellows is fixed to the liquid outlet pipe 3, and the second end of the bellows is fixed to the outer cylinder 14. When the closed structure formed by the inner cylinder 13 and the inner tank bottom plate 12 shrinks towards the center of the storage tank or extends away from the center of the storage tank, the liquid outlet pipe 3 moves accordingly, and the first end of the bellows connected to the liquid outlet pipe 3 also moves accordingly. The bellows can extend and retract so that the second end connected thereto does not move, thereby maintaining the stability of the cryogenic storage tank.

[0062] Preferably, the telescopic compensator 8 is partially or entirely located outside the outer cylinder 14, so that when welding is performed between the telescopic compensator 8 and the outer cylinder 14 and between the telescopic compensator 8 and the liquid outlet pipe 3 to achieve fixation, welding can be performed on the outside of the outer cylinder 14, thereby facilitating welding between the telescopic compensator 8 and the outer cylinder 14 and between the telescopic compensator 8 and the liquid outlet pipe 3. When installing the bellows, a reinforcement ring is welded on the second end of the bellows, and then welded to the outer cylinder 14 through the reinforcement ring, and the perforation is blocked, so as to improve the welding strength between the outer cylinder 14 and the bellows.

[0063] In one embodiment, a reinforcement ring is also welded on the first end of the bellows, and the first end of the bellows is welded to the liquid outlet pipe 3 through the reinforcement ring. In other embodiments, the first end of the bellows can also be directly welded to the liquid outlet pipe 3.

[0064] In one embodiment, the welds between the liquid outlet pipe 3 and the telescopic compensator 8 and between the telescopic compensator 8 and the outer cylinder 14 are subjected to 100% MT testing using the industry standard NB / T47013.5-2015 and meet the Grade I qualification.

[0065] In one embodiment, the gap between the bellows and the liquid outlet pipe 3 is filled with insulation cotton to prevent cold leakage from the liquid outlet pipe 3. The insulation cotton between the bellows and the liquid outlet pipe 3 needs to be compressed by 50%, and the insulation cotton meets the requirements of thermal conductivity <0.037W / (mK) (measured data at 10°C), moisture content ≤0.2%, and non-flammable. In other embodiments, the insulation member 4 can also be pearlescent sand.

[0066] In a preferred embodiment, the cryogenic storage tank also includes an anti-vortex device 9, which is fixed on the inner tank bottom plate 12, and one end of the anti-vortex device 9 is inserted into the liquid outlet pipe 3, so that the anti-vortex device 9 can guide and suppress disturbances when the cryogenic liquid inside the cryogenic storage tank enters the liquid outlet pipe 3, so that the flow of the cryogenic liquid is more stable, avoiding stress concentration at the entrance of the liquid outlet pipe 3, and avoiding the cryogenic liquid directly impacting the weld between the liquid outlet pipe 3 and the inner tank bottom plate 12 when discharging the cryogenic liquid, thereby reducing the life of the cryogenic storage tank.

[0067] The anti-eddy current device 9 is welded and fixed to the inner tank bottom plate 12, and the weld between the anti-eddy current device 9 and the inner tank bottom plate 12 is arranged on the side of the inner tank bottom plate 12 away from the foundation support 2, so that welding is convenient.

[0068] exist Figure 3In the illustrated embodiment, the diameter of the upper end of the anti-vortex device 9 is larger than the diameter of the liquid outlet hole, and the upper end of the anti-vortex device 9 protrudes from the side of the inner tank bottom plate 12 facing away from the foundation platform 2, such that an included angle is formed between the circumferential outer surface of the upper end of the anti-vortex device 9 and the upper surface of the inner tank bottom plate 12, and thus fillet welding is performed at the included angle, making the welding operation convenient. Among them, the lower end of the anti-vortex device 9 is inserted into the liquid outlet pipe 3, and the diameter of the lower end of the anti-vortex device 9 is adapted to the inner diameter of the liquid outlet pipe 3, such that the lower end of the anti-vortex device 9 can guide the cryogenic liquid into the interior of the liquid outlet pipe 3, and when installing the anti-vortex device 9, the liquid outlet pipe 3 plays a positioning role for the anti-vortex device 9, making the installation convenient.

[0069] The weld between the anti-vortex device 9 and the inner tank bottom plate 12 is subjected to 100% RT inspection in accordance with the industry standard NB / T47013.2 - 2015. It is required that the radiographic inspection technique level is not lower than level AB, and the qualified level is not lower than level II.

[0070] Refer to Figure 1 , in an embodiment, the cryogenic storage tank further includes an emergency valve 10, and the emergency valve 10 can control the on-off of the liquid outlet pipe 3. In this application, the liquid outlet hole is provided on the inner tank bottom plate 12, and the axis of the liquid outlet hole is vertically arranged. The emergency valve 10 is preferably a gravity valve, and the gravity valve includes an actuator, a valve body, and a valve core. The valve body is arranged above the liquid outlet hole, the valve core is movably arranged in the valve body, the actuator is arranged at the top of the outer cylinder, and is connected to the valve core. The actuator can drive the valve core to block the liquid outlet hole and drive the valve core to separate from the liquid outlet hole to control the on-off of the liquid outlet pipe.

[0071] In an embodiment, the actuator is an electromagnetic structure. When the actuator is energized, it can drive the valve core to rise to open the liquid outlet hole. When the actuator loses power, the valve core descends under the action of gravity and blocks the liquid outlet hole.

[0072] Specifically, the actuator is fixed to the top of the outer cylinder 14 to form the top structure of the emergency valve 10, and the actuator is welded to the outer cylinder 14. The weld between the actuator and the outer cylinder 14 is subjected to 100% MT inspection in accordance with the industry standard NB / T47013.5 - 2015 and meets the qualified level of grade I.

[0073] The valve body is fixed to the inner tank bottom plate 12, and the valve core is slidably connected to the valve body, such that when the actuator drives the valve core to move, the valve core moves up and down in the valve body and realizes the opening and closing functions. Through the setting of the valve body, it is avoided that the valve core deviates from the position of the liquid outlet hole and cannot block the liquid outlet hole. In an embodiment, the valve body is welded to the inner tank bottom plate 12, and the weld between the valve body and the inner tank bottom plate 12 is subjected to 100% MT inspection in accordance with the industry standard NB / T47013.5 - 2015 and meets the qualified level of grade I.

[0074] In its embodiments, the emergency valve 10 can also be other control valves capable of controlling the on-off of the liquid outlet pipe 3, such as solenoid valves and ball valves.

[0075] As can be seen from the above, the present application has at least the following advantages:

[0076] 1. By providing a receiving groove 21 at the top of the foundation platform 2, the present cryogenic storage tank realizes side liquid discharge, so that the liquid outlet pipe 3 does not need to penetrate the foundation platform 2, avoiding damage to the structure of the foundation platform 2 and ensuring that the overall load-bearing capacity of the foundation platform 2 is not damaged.

[0077] 2. The liquid outlet hole is provided on the inner tank bottom plate 12, and the liquid outlet pipe 3 passes through the liquid outlet hole and is welded inside the inner tank, without the need for welding in the receiving groove 21, providing a large welding space, facilitating welding, and also making it more convenient to maintain the liquid outlet pipe in the later stage.

[0078] 3. The material of the heat insulation member 4 can be filled horizontally or from top to bottom, reducing the filling difficulty of the material of the heat insulation member 4, and facilitating compaction of the heat insulation member 4 to avoid cold leakage.

[0079] 4. An installation member 5 is provided in the receiving groove 21, and the installation member 5 is welded to the outer tank bottom plate 11 and the outer cylinder 14 to form a structure enclosing the outside of the inner tank, improving the heat insulation effect of the cryogenic storage tank and also preventing the material of the foundation platform 2 from failing due to too low temperature.

[0080] 5. A telescopic compensator 8 is provided between the liquid outlet pipe 3 and the outer cylinder 14, improving the stability of the cryogenic storage tank, and at least part of the telescopic compensator 8 is located outside the outer cylinder 14, facilitating welding and maintenance of the telescopic compensator 8.

[0081] It can be understood that for those of ordinary skill in the art, equivalent substitutions or changes can be made according to the technical solutions and inventive concepts of the present utility model, and all such changes or substitutions should fall within the protection scope of the present utility model.

Claims

1. A cryogenic storage tank, characterized in that: include: A tank body is used to store cryogenic liquid; a liquid outlet hole is provided at the bottom of the tank body; A base support, which is arranged at the bottom of the tank body to support the tank body; A receiving groove is provided on the top of the base support platform, the top of the receiving groove is open, and the receiving groove extends to one side edge of the base support platform and is open; A liquid outlet pipe is disposed in the containing tank; one end of the liquid outlet pipe is connected to the liquid outlet hole, and the other end of the liquid outlet pipe extends to pass through the containing tank; The heat-insulating component is arranged in the containing groove and covers the outer periphery of the liquid outlet pipe.

2. The cryogenic storage tank according to claim 1, characterized in that: The low-temperature storage tank also includes a mounting member, which is disposed in the containing groove and connected to the tank body. The mounting member is hollow inside and has openings at both ends, and the liquid outlet pipe is disposed inside the mounting member.

3. The cryogenic storage tank according to claim 2, characterized in that: The tank body includes an outer tank bottom plate arranged on the top of the base support platform and an inner tank bottom plate arranged above the outer tank bottom plate at an interval. The liquid outlet is arranged on the inner tank bottom plate. A notch is provided on the outer tank bottom plate, and the notch corresponds to the opening of the accommodating groove. The edge of the notch is connected to the outer peripheral wall of the mounting member. The liquid outlet pipe portion is located between the outer tank bottom plate and the inner tank bottom plate.

4. The cryogenic storage tank according to claim 3, characterized in that: The cross section of the mounting member is arc-shaped, and the convex surface thereof faces the foundation support platform; Both ends of the cross section of the mounting piece are disconnected, and the top of the mounting piece is connected to the bottom plate of the outer tank to close the gap.

5. The cryogenic storage tank according to claim 3, characterized in that: The tank body further comprises an inner cylinder and an outer cylinder, wherein the inner cylinder is arranged on the inner tank bottom plate and encloses a space for storing the cryogenic liquid with the inner tank bottom plate, and the outer cylinder is arranged on the outer tank bottom plate; A through hole is formed at the lower part of the outer cylinder, and the liquid outlet pipe passes through the through hole and extends to the outside of the outer cylinder.

6. The cryogenic storage tank according to claim 5, characterized in that: The tank body further comprises a first thermal insulation layer and a second thermal insulation layer, wherein the first thermal insulation layer is arranged between the inner tank bottom plate and the outer tank bottom plate; An interlayer is formed between the inner cylinder and the outer cylinder, and the second heat-insulating layer is arranged in the interlayer.

7. The cryogenic storage tank according to claim 5, characterized in that: The cryogenic storage tank further comprises a telescopic compensator, which is sleeved on the liquid outlet pipe and fixedly connected to the outer cylinder and the liquid outlet pipe respectively; The telescopic compensator is at least partially located outside the outer cylinder.

8. The cryogenic storage tank according to any one of claims 5 to 7, characterized in that: The liquid outlet pipe includes a horizontal section and a vertical section, one end of the horizontal section is located in the containing groove, and the other end extends to the outside of the containing groove, the lower end of the vertical section is connected to the horizontal section, and the upper end of the vertical section is connected to the liquid outlet hole.

9. The cryogenic storage tank according to claim 8, characterized in that: The upper end of the vertical section is inserted into the liquid outlet hole, and the vertical section is welded to the bottom plate of the inner tank; The weld between the vertical section and the inner tank bottom plate is arranged on a side of the inner tank bottom plate away from the foundation support platform.

10. The cryogenic storage tank according to claim 9, characterized in that: The inner tank bottom plate forms a slope at the side wall of the liquid outlet, and a weld between the vertical section and the inner tank bottom plate is formed between the slope and the outer surface of the vertical section; and / or, The cryogenic storage tank further comprises an anti-vortex device, which is fixed on the bottom plate of the inner tank, and one end of the anti-vortex device is inserted into the liquid outlet pipe; The anti-eddy current device is welded and fixed to the inner tank bottom plate, and the weld between the anti-eddy current device and the inner tank bottom plate is arranged on a side of the inner tank bottom plate away from the foundation support platform; and / or, The low-temperature storage tank also includes an emergency valve, which includes an actuator, a valve body and a valve core. The valve body is arranged above the liquid outlet, and the valve core is movably arranged in the valve body. The actuator is arranged on the top of the outer cylinder and is connected to the valve core. The actuator can drive the valve core to block the liquid outlet and drive the valve core to separate from the liquid outlet to control the on-off of the liquid outlet pipe.

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