A pump tower for a low-temperature liquid cargo storage tank

Abstract

An embodiment of the present invention provides a pump tower for a cryogenic liquid cargo storage tank, including: four risers of a first unloading pipe, a second unloading pipe, an injection pipe, and an emergency unloading pipe that are vertically arranged. The four risers are fixedly connected in sequence through parallel supports and form a prism structure with a quadrilateral cross-section; a first elbow is provided in the middle and lower part of the first unloading pipe in its height direction, and the first elbow is in the plane where the first unloading pipe and the emergency unloading pipe are located; a second elbow is provided in the middle and lower part of the second unloading pipe in its height direction, and the second elbow is in the plane where the second unloading pipe and the emergency unloading pipe are located; a third elbow is provided in the middle and lower part of the injection pipe in its height direction, and the third elbow is in the plane where the injection pipe and the emergency unloading pipe are located; the area of the quadrilateral cross-section formed by the three risers below the elbows and the emergency unloading pipe is 2 to 3 times the area of the quadrilateral cross-section formed by the upper parts of the four risers.

Description

Technical Field

[0001] The present invention relates to the technical field of equipment for transporting and storing cryogenic liquid cargo, and in particular to a pump tower for a cryogenic liquid cargo storage tank. Background Art

[0002] When transporting gases such as natural gas and ethane gas, for more economical long-distance transportation, the gas is usually cooled to a low temperature and the liquefied gas is transported. The volume of the liquefied gas is greatly reduced, and the transportation cost is lowered. The liquefied cryogenic liquid is stored and transported using a dedicated cryogenic storage tank, and a pump tower is provided inside the storage tank as a passage for the cryogenic liquid to enter and exit the storage tank. The pump tower provided inside the cryogenic liquid cargo storage tank is known in the prior art. The pump tower has a tripod structure, that is, it includes three riser structures fixed to each other by cross beams. Each riser is hollow and includes two unloading pipes and one emergency unloading pipe, which are arranged in a triangular cross-section. The injection pipe is arranged on the side of the emergency unloading pipe. Two unloading pumps are correspondingly arranged at the bottom of the pump tower. Due to the limited space of the triangular cross-section, the layout at the bottom of the pump tower is very compact, making it inconvenient for subsequent equipment maintenance.

[0003] At sea, under the action of surges, the liquefied gas storage tank will experience load sloshing phenomena. These phenomena may be very violent inside the storage tank, so very large loads will be generated inside the storage tank, especially on equipment such as the pump tower. The pump tower of the prior art has the same shape from top to bottom, and additional strengthening designs are required at positions with larger upper loads, and its structural strength is not optimal. Summary of the Invention

[0004] In view of the above problems existing in the prior art, an embodiment of the present invention provides a pump tower for a cryogenic liquid cargo storage tank. The pump tower adopts a variable cross-section structure, solving the problems existing in the above background art. The pump tower provided by the present invention can, on the premise of meeting the functional requirements of the pump tower, design the upper end of the pump tower to be narrower, thereby reducing the sloshing load and improving the overall stiffness of the pump tower. At the same time, the lower end of the pump tower is appropriately enlarged, optimizing the space layout, increasing the space at the bottom of the pump tower, facilitating equipment layout, and facilitating subsequent construction and maintenance, which is of great practical value.

[0005] An embodiment of the present invention provides a pump tower for a cryogenic liquid cargo storage tank, including: a first unloading pipe, a second unloading pipe, an injection pipe, and an emergency unloading pipe that are vertically arranged, wherein,

[0006] The first unloading pipe, the second unloading pipe, the injection pipe, and the emergency unloading pipe are sequentially fixedly connected by parallel supports and form a prism structure with a quadrilateral cross-section;

[0007] The middle lower part of the first unloading pipe in its longitudinal direction is provided with a first elbow, and the first elbow is in the plane where the first unloading pipe and the emergency unloading pipe are located;

[0008] The middle lower part of the second unloading pipe in its longitudinal direction is provided with a second elbow, and the second elbow is in the plane where the second unloading pipe and the emergency unloading pipe are located;

[0009] The middle lower part of the injection pipe in its longitudinal direction is provided with a third elbow, and the third elbow is in the plane where the injection pipe and the emergency unloading pipe are located;

[0010] Wherein, the area of the quadrilateral cross-section formed by the part of the first unloading pipe below the first elbow, the part of the second unloading pipe below the second elbow, the part of the injection pipe below the third elbow and the emergency unloading pipe is 2 to 3 times the area of the quadrilateral cross-section formed by the upper part of the first unloading pipe, the upper part of the second unloading pipe, the upper part of the injection pipe and the upper part of the emergency unloading pipe, so as to form a space for arranging related equipment between the first unloading pipe, the second unloading pipe, the injection pipe and the emergency unloading pipe.

[0011] In some embodiments of the present invention, the first elbow, the second elbow and the third elbow are all elbows with equal diameters, and are all the same as the diameters of the pipes they are connected to;

[0012] Wherein, the first elbow offsets the lower part of the first unloading pipe away from the emergency unloading pipe side, the second elbow offsets the lower part of the second unloading pipe away from the emergency unloading pipe side, and the third elbow offsets the lower part of the injection pipe away from the emergency unloading pipe side.

[0013] In some embodiments of the present invention, the plane where the first unloading pipe and the second unloading pipe are located is parallel to the transverse plane perpendicular to the longitudinal direction of the ship they are on;

[0014] The plane where the injection pipe and the emergency unloading pipe are located is parallel to the longitudinal plane parallel to the longitudinal direction of the ship they are on.

[0015] In some embodiments of the present invention, the injection pipes are all fixedly connected to the parallel support through pipe clamp components, and the pipe clamp components can make the injection pipes move in the vertical direction and limit the movement of the injection pipes in the horizontal direction. The pipe clamp components include pipe clamp sleeves and pipe clamp pads. Among them,

[0016] The pipe clamp sleeve is concentric with the injection pipe, and at least two pipe clamp pads fixedly connected to the pipe clamp sleeve are provided between the pipe clamp sleeve and the injection pipe, so as to form a spacing of at least 10 mm between the pipe clamp sleeve and the injection pipe, and enable the injection pipe to move in the vertical direction and be restricted in the horizontal direction.

[0017] In some embodiments of the present invention, the injection pipe is fixedly connected to the parallel support through the pipe clamp sleeve, and at least one pipe clamp connecting elbow plate is provided at the connection between the pipe clamp sleeve and the parallel support.

[0018] In some embodiments of the present invention, the lower end of the injection pipe is fixedly connected to the pump tower bottom plate, and the lower end opening of the injection pipe is located below the pump tower bottom plate. A liquid impact prevention device for preventing liquid from directly impacting the liquid cargo storage tank is provided at the opening of the injection pipe.

[0019] In some embodiments of the present invention, the lower ends of the first unloading pipe, the second unloading pipe and the emergency unloading pipe are all fixed on the pump tower bottom plate;

[0020] The quadrilateral cross-section formed by the first unloading pipe, the second unloading pipe, the injection pipe and the emergency unloading pipe is square.

[0021] In some embodiments of the present invention, a pump tower base is provided below the pump tower bottom plate. The lower end of the pump tower base is fixed to the bottom of the storage tank, and the upper end passes through the pump tower bottom plate and is connected to the pump tower bottom plate through a top block to limit the horizontal displacement of the pump tower.

[0022] In some embodiments of the present invention, the parallel supports are multi-layered, and diagonal braces are provided between adjacent two layers of parallel supports to form an integral truss structure through the horizontal supports and the diagonal braces.

[0023] In some embodiments of the present invention, at least a unloading pump is arranged in the space for arranging relevant equipment, wherein,

[0024] At least two horizontal supports are arranged on the parallel support corresponding to the space for arranging relevant equipment to reserve a space for installing the unloading pump in the bow direction;

[0025] Each layer of the parallel supports in other layers of the multi-layer parallel supports is provided with four horizontal supports.

[0026] Compared with the prior art, the beneficial effects of the pump tower for cryogenic liquid cargo storage tanks provided by the embodiments of the present invention are as follows: It adopts a variable cross-section structure. By reducing the upper space of the pump tower, the lengths of the horizontal supports and diagonal braces are reduced, so as to reduce the construction cost of the pump tower. At the same time, the load-bearing surface of the upper part of the pump tower can be reduced, which helps to reduce the load, while improving the stiffness of the pump tower structure and enhancing the structural strength of the pump tower; the design scheme expands the layout space for arranging equipment at the bottom of the pump tower, facilitating the design and construction of the pump tower bottom plate. Description of the Drawings

[0027] Figure 1 Isometric schematic diagram of the pump tower for cryogenic liquid cargo storage tanks provided by the embodiments of the present invention;

[0028] Figure 2 Front view schematic diagram of the pump tower for cryogenic liquid cargo storage tanks provided by the embodiments of the present invention;

[0029] Figure 3 Top view schematic diagram of the upper part of the pump tower for cryogenic liquid cargo storage tanks provided by the embodiments of the present invention;

[0030] Figure 4 Top view schematic diagram of the lower part of the pump tower for cryogenic liquid cargo storage tanks provided by the embodiments of the present invention;

[0031] Figure 5 Top view schematic diagram of the injection pipe and injection pipe clamp of the pump tower for cryogenic liquid cargo storage tanks provided by the embodiments of the present invention;

[0032] Figure 6 Isometric schematic diagram of the injection pipe clamp of the pump tower for cryogenic liquid cargo storage tanks provided by the embodiments of the present invention;

[0033] Figure 7 Side view schematic diagram of the injection pipe clamp of the pump tower for cryogenic liquid cargo storage tanks provided by the embodiments of the present invention;

[0034] Figure 8 Isometric schematic diagram of the injection pipe and anti-liquid impact device of the pump tower for cryogenic liquid cargo storage tanks provided by the embodiments of the present invention;

[0035] Figure 9 Isometric schematic diagram of the anti-liquid impact device provided at the opening of the injection pipe of the pump tower for cryogenic liquid cargo storage tanks provided by the embodiments of the present invention;

[0036] Figure 10 Top view schematic diagram of the anti-liquid impact device provided at the opening of the injection pipe of the pump tower for cryogenic liquid cargo storage tanks provided by the embodiments of the present invention;

[0037] Figure 11Schematic side view of the liquid impact prevention device provided at the injection pipe opening of the pump tower for a cryogenic liquid cargo storage tank according to an embodiment of the present invention;

[0038] Figure 12 Front view schematic of the liquid impact prevention device provided at the injection pipe opening of the pump tower for a cryogenic liquid cargo storage tank according to an embodiment of the present invention;

[0039] Figure 13 Axonometric view of the connection between the pump tower base and the pump tower bottom plate provided below the pump tower for a cryogenic liquid cargo storage tank according to an embodiment of the present invention;

[0040] Figure 14 Top view schematic of the connection between the pump tower base and the pump tower bottom plate provided below the pump tower for a cryogenic liquid cargo storage tank according to an embodiment of the present invention;

[0041] Figure 15 For Figure 14 Top view schematic of A - A in

[0042] Figure 16 Axonometric view of the pump tower base provided below the pump tower for a cryogenic liquid cargo storage tank according to an embodiment of the present invention;

[0043] Figure 17 Top view schematic of the pump tower base provided below the pump tower for a cryogenic liquid cargo storage tank according to an embodiment of the present invention;

[0044] Figure 18 Side view schematic of the pump tower base provided below the pump tower for a cryogenic liquid cargo storage tank according to an embodiment of the present invention;

[0045] Figure 19 Central cross - sectional view schematic of the pump tower base provided below the pump tower for a cryogenic liquid cargo storage tank according to an embodiment of the present invention;

[0046] Figure 20 Axonometric view of the top block of the pump tower base provided below the pump tower for a cryogenic liquid cargo storage tank according to an embodiment of the present invention;

[0047] Figure 21 Top view schematic of the top block of the pump tower base provided below the pump tower for a cryogenic liquid cargo storage tank according to an embodiment of the present invention.

[0048] Reference numerals

[0049] 11. First unloading pipe; 12. Second unloading pipe; 13. Injection pipe; 14. Emergency unloading pipe; 15. Pump tower bottom plate; 16. Horizontal support; 17. Diagonal brace; 18. Unloading pump; 19. Anti-liquid impact device; 21. First elbow; 22. Second elbow; 23. Third elbow; 30. Pipe clamp component; 31. Pipe clamp connecting gusset plate; 32. Pipe clamp cushion block; 33. Pipe clamp sleeve; 40. Opening; 41. Bottom plate; 42. Side wall; 43. Enclosing wall; 44. Horizontal fixing plate; 45. First water flow hole; 46. Second water flow hole; 47. Arc-shaped side; 50. Pump tower base; 51. Top block; 52. Connecting gusset plate; 53. Limit hole; 61. Cylinder body; 62. Connecting ring; 63. Connecting enclosing plate; 64. Support pile panel; 65. Support pile enclosing wall; 66. Support pile flat plate; 67. Horizontal stiffening plate; 68. Support flat plate; 71. Vertical support plate; 72. Top block panel; 73. Top block connecting plate; 74. Horizontal support plate; 75. Oval slot. Detailed implementation mode

[0050] To enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be described in detail below in conjunction with the accompanying drawings and specific implementation modes.

[0051] Reference is made herein to the various solutions and features of the present application described with reference to the drawings.

[0052] These and other features of the present application will become apparent from the following description of the preferred forms of the embodiments given as non-limiting examples with reference to the accompanying drawings.

[0053] It should also be understood that although the present application has been described with reference to some specific examples, those skilled in the art can surely implement many other equivalent forms of the present application, which have the features as described in the claims and thus are all within the protection scope defined hereby.

[0054] When combined with the accompanying drawings, the above and other aspects, features and advantages of the present application will become more apparent in view of the following detailed description.

[0055] Hereinafter, specific embodiments of the present application will be described with reference to the drawings; however, it should be understood that the embodiments claimed are merely examples of the present application, which can be implemented in various ways. Well-known and / or repetitive functions and structures are not described in detail to clarify the true intention according to the user's historical operations and to avoid unnecessary or redundant details from obscuring the present application. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but are merely used as a basis for the claims and a representative basis for teaching those skilled in the art to use the present application in substantially any suitable detailed structure in a variety of ways.

[0056] This specification may use phrases such as "in one embodiment", "in another embodiment", "in yet another embodiment", or "in other embodiments", all of which may refer to one or more of the same or different embodiments according to the present application.

[0057] In this embodiment, an orthogonal frame defined by two axes x and y in the figure is used to describe the elements of the pump tower, where the axis x represents the longitudinal direction of the ship, and the axis y represents the transverse axis perpendicular to the longitudinal direction of the ship.

[0058] An embodiment of the present invention provides a pump tower for a cryogenic liquid cargo storage tank. The cryogenic liquid cargo storage tank is specifically used to store gases such as liquefied natural gas and ethane gas in a liquid state, and can be used as the cryogenic liquid cargo storage tank of a liquid transport ship, or as the cryogenic liquid cargo storage tank of other ships using cryogenic liquid as fuel, such as Figures 1 to 21 As shown, the pump tower includes: a vertically arranged first discharge pipe 11, a second discharge pipe 12, an injection pipe 13, and an emergency discharge pipe 14. Among them, the first discharge pipe 11, the second discharge pipe 12, the injection pipe 13, and the emergency discharge pipe 14 are sequentially fixedly connected through parallel supports and form a prism structure with a quadrilateral cross-section. The quadrilateral cross-section main body frame is composed of 4 riser pipes, namely, the first discharge pipe 11, the second discharge pipe 12, the injection pipe 13, and the emergency discharge pipe 14. That is, the four riser pipes and the parallel supports together define a prism with a quadrilateral cross-section;

[0059] At the same time, the first discharge pipe 11 is provided with a first elbow 21 in the middle and lower part of its height direction, and the first elbow 21 is in the plane where the first discharge pipe 11 and the emergency discharge pipe 14 are located; the second discharge pipe 12 is provided with a second elbow 22 in the middle and lower part of its height direction, and the second elbow 22 is in the plane where the second discharge pipe 12 and the emergency discharge pipe 14 are located; the injection pipe 13 is provided with a third elbow 23 in the middle and lower part of its height direction, and the third elbow 23 is in the plane where the injection pipe 13 and the emergency discharge pipe 14 are located; among them, the part of the first discharge pipe 11 below the first elbow 21, the part of the second discharge pipe 12 below the second elbow 22, the part of the injection pipe 13 below the third elbow 23, and the emergency discharge pipe 14 form a quadrilateral cross-sectional area that is 2 to 3 times the quadrilateral cross-sectional area formed by the upper parts of the first discharge pipe 11, the second discharge pipe 12, the injection pipe 13, and the emergency discharge pipe 14, so as to form a space for arranging relevant equipment between the first discharge pipe 11, the second discharge pipe 12, the injection pipe 13, and the emergency discharge pipe 14. That is, through the first elbow 21, the second elbow 22, and the third elbow 23, the space formed by the first discharge pipe 11, the second discharge pipe 12, the injection pipe 13, and the emergency discharge pipe 14 in the lower area of the pump tower is increased, thereby facilitating the installation and arrangement of equipment such as the discharge pump 18. At the same time, the pump tower has a variable cross-section structure.

[0060] In some embodiments of the present invention, the first elbow 21, the second elbow 22 and the third elbow 23 are all elbows with equal diameters, and are all the same as the diameters of the pipes they are connected to respectively. By providing the third elbow 23, when the liquid cargo flows through the injection pipe 13, a certain degree of buffering can be formed through the provided elbows, avoiding the direct impact of the liquid cargo on the inner wall of the storage tank; wherein, the first elbow 21 offsets the lower part of the first unloading pipe 11 away from the emergency unloading pipe 14 side, the second elbow 22 offsets the lower part of the second unloading pipe 12 away from the emergency unloading pipe 14 side, and the third elbow 23 offsets the lower part of the injection pipe 13 away from the emergency unloading pipe 14 side.

[0061] Meanwhile, in this embodiment, the planes where the first unloading pipe 11 and the second unloading pipe 12 are located are parallel to the transverse plane (P2 plane) perpendicular to the longitudinal direction (x-axis direction) of the ship they are on; the planes where the injection pipe 13 and the emergency unloading pipe 14 are located are parallel to the longitudinal plane (P1 plane) parallel to the longitudinal direction (y-axis direction) of the ship they are on, and, the emergency unloading pipe 14 is at the front end of the pump tower, the injection pipe 13 is at the rear end of the pump tower, and the first unloading pipe 11 and the second unloading pipe 12 are symmetrically located on the left and right sides of the pump tower respectively. Through the symmetrical arrangement, the stability of the pump tower can be improved.

[0062] In some embodiments of the present invention, the parallel supports are multi-layered. Each layer of parallel supports is connected to 4 vertically arranged riser pipes to form an annular support on the same horizontal plane, and diagonal braces 17 are provided between adjacent two layers of parallel supports, thereby resisting the torque of the pump tower. By providing the horizontal supports 16 and the diagonal braces 17 in the pump tower frame structure, the pump tower is connected into an integral truss structure, thereby effectively resisting the sloshing load and improving the stiffness and torsional resistance of the pump tower.

[0063] In this embodiment, at least a unloading pump 18 is arranged in the space for arranging relevant equipment. Among them, at least two horizontal supports 16 are arranged on the parallel supports corresponding to the space for arranging relevant equipment. That is, in order to make this space meet the space usage requirements for arranging equipment, only part of the horizontal supports 16 in this part are installed, thereby realizing reserving a space for installing the unloading pump 18 in the bow direction. The unloading pump 18 can be two. In addition, an emergency pump can also be arranged at this space; each layer of parallel supports in other layers of the multi-layer parallel supports is arranged with four horizontal supports 16.

[0064] In some embodiments of the present invention, when injecting cryogenic liquid cargo into the storage tank, the injection is carried out through the injection pipe 13. As a result, there may be a temperature difference between the injection pipe 13 and other pump tower components, causing asynchronous thermal expansion and contraction. If the injection pipe 13 is connected to the horizontal support 16 and the diagonal brace 17 by welding, it will result in large temperature stresses, posing a risk to the structural safety. The injection pipe 13 is fixedly connected to the parallel support through the pipe clamp component 30. The pipe clamp component 30 enables the injection pipe 13 to move in the vertical direction and restricts the movement of the injection pipe 13 in the horizontal direction. There can be multiple pipe clamp components 30, that is, the injection pipe 13 is respectively connected to the parallel support of one layer through at least one pipe clamp component 30. Each pipe clamp component 30 includes a pipe clamp sleeve 33 and a pipe clamp pad 32. Among them, the pipe clamp sleeve 33 is concentric with the injection pipe 13, and at least two pipe clamp pads 32 fixedly connected to the pipe clamp sleeve 33 are provided between the pipe clamp sleeve 33 and the injection pipe 13, so as to form a spacing of at least 10 mm between the pipe clamp sleeve 33 and the injection pipe 13. The pipe clamp pad 32 and the pipe clamp sleeve 33 are fixedly connected through a connecting piece. This connecting piece can be a bolt or a rivet, etc.

[0065] In this embodiment, the injection pipe 13 is fixedly connected to the parallel support through the pipe clamp sleeve 33, and at least one pipe clamp connecting elbow plate 31 is provided at the connection between the pipe clamp sleeve 33 and the parallel support. Specifically, one pipe clamp sleeve 33 is simultaneously fixedly connected to two horizontal supports 16 in the same layer. Furthermore, a large-sized pipe clamp connecting elbow plate 31 can be provided between the two horizontal supports 16. At the same time, the large-sized pipe clamp connecting elbow plate 31 is fixedly connected to the two horizontal supports 16 and the pipe clamp sleeve 33. On the outer sides of the two horizontal supports 16 away from the large-sized pipe clamp connecting elbow plate 31, smaller-sized pipe clamp connecting elbow plates 31 are respectively provided to fixedly connect the corresponding horizontal support 16 and the pipe clamp sleeve 33, thereby improving the stiffness at the connection position between the horizontal support 16 and the pipe clamp sleeve 33 and reducing local stress concentration.

[0066] In some embodiments of the present invention, the lower end of the injection pipe 13 is fixedly connected to the pump tower bottom plate 15. The injection pipe 13 is kept vertical near the bottom of the storage tank, and the lower end opening of the injection pipe 13 is located below the pump tower bottom plate 15. An anti-liquid impact device 19 is provided at the opening of the injection pipe 13. The anti-liquid impact device 19 guides the liquid injected through the injection pipe 13, thereby avoiding the direct impact of the cryogenic liquid (liquid cargo) on the liquid cargo storage tank when injecting, slowing down the flow rate of the cryogenic liquid when injecting through the injection pipe 13, and avoiding the influence of fluid jet. Among them, as Figures 8 to 12As shown in the figure, the fluid impact prevention device 19 includes: a bottom plate 41, which is arranged below the opening 40 of the injection pipe 13, and a flow guiding surface is formed on one side facing the opening 40. The bottom plate 41 can protect the storage tank from the influence of the fluid in the injection tank and falling objects. Specifically, the bottom plate 41 is arranged below the opening 40 of the injection pipe 13 and maintains a spacing distance from the opening 40; two side walls 42 arranged in parallel, and the lower end of each side wall 42 is fixedly connected to the bottom plate 41, and the upper end of each side wall 42 is fixedly connected to the outer side wall 42 at the bottom end of the injection pipe 13 through a horizontal fixing plate 44. The side walls 42 are the main supporting devices of the fluid impact prevention device; two enclosing walls 43, which are respectively arranged between the two side walls 42. The two enclosing walls 43 are arranged in parallel and perpendicular to the two side walls 42, and are connected to the two side walls 42 to form a whole, thereby enclosing a rectangular enclosing wall 43 structure; wherein, at least one wall in the rectangular enclosing wall structure formed by the two side walls 42 and the two enclosing walls 43 is provided with a water flow hole, and the number of walls provided with water flow holes in the rectangular enclosing wall structure, as well as the number and opening size of the water flow holes, are determined based on the flow velocity and flow direction of the fluid after being guided by the flow guiding plate. That is, the flow velocity and flow direction of the fluid guiding can be controlled by whether to set water flow holes on the side wall 42 or the enclosing wall 43 and adjusting the opening size of the water flow holes. Furthermore, the fluid injected into the storage tank is deflected and preferably injected in the direction opposite to the equipment components to be protected. At the same time, the sum of the cross-sectional areas of all the water flow holes is greater than the cross-sectional area of the opening 40 of the water injection pipe 13.

[0067] In order to be able to guide the injected liquid more quickly, in some embodiments of the present invention, the bottom plate 41 is a spherical panel, and the convex side of the spherical panel faces the opening 40 of the injection pipe 13 as the flow guiding surface. The center of the sphere of the spherical panel is on the vertical axis of the injection pipe 13. The bottom plate 41 is rectangular in its top view, and its area is larger than the area of the opening 40 of the injection pipe 13. Compared with the bottom plate 41 on the horizontal plane, the spherical panel bottom plate 41 can make the vertically injected liquid generate a lateral velocity component, realizing the uniform and rapid flow guiding of the fluid to the surrounding, and can effectively reduce the impact load of the injected liquid on the bottom plate 41, protecting the fluid impact prevention device.

[0068] In addition, in order to be able to better guide the liquid, in this embodiment, the side wall 42 is a flat panel. If a first water flow hole 45 is provided on the side wall 42, the first water flow hole 45 is opened on the side of the side wall 42 close to the bottom plate 41 and is centered, and the upper part of the first water flow hole 45 is semi-oval in shape and is arranged in a floor-standing manner to realize the guiding of the injected liquid and help the rapid derivation of the fluid.

[0069] Meanwhile, in this embodiment, both side edges of the surrounding wall 43 are connected to the side wall 42, and the bottom edge of the surrounding wall 43 is fixedly connected to the bottom plate 41. If a second water flow hole 46 is provided on the surrounding wall 43, the second water flow hole 46 is provided on the side of the surrounding wall 43 close to the bottom plate 41 and is centered, and is in a semi-oval shape, and is arranged in a floor-standing manner to achieve the diversion of the injected liquid and help the rapid export of the fluid.

[0070] In this embodiment, the horizontal fixing plate 44 is located at the top of the side wall 42. The side edge facing the injection pipe 13 is an arc-shaped side edge 47, and the radius of the arc-shaped side edge 47 is the same as the outer circle radius of the injection pipe 13. The horizontal fixing plate 44 and the outer wall of the injection pipe 13 are fixed by welding. The horizontal plane where the horizontal fixing plate 44 is located is higher than the horizontal plane where the opening 40 of the injection pipe 13 is located, and the vertical distance is 30 mm - 100 mm, which is convenient for welding the horizontal fixing plate 44. At the same time, the horizontal fixing plates 44 on the two side walls 42 are symmetrically arranged with respect to the injection pipe 13 to effectively fix the anti-fluid impact device at the lower end of the injection pipe 13 and avoid the torsion of the anti-fluid impact device, ensuring the stability of the device.

[0071] Furthermore, in this embodiment, the lower ends of the first unloading pipe 11, the second unloading pipe 12, and the emergency unloading pipe 14 are all fixed on the pump tower bottom plate 15. The quadrilateral cross-section formed by the first unloading pipe 11, the second unloading pipe 12, the injection pipe 13, and the emergency unloading pipe 14 is square, that is, in the upper region of the pump tower, the first unloading pipe 11, the second unloading pipe 12, the injection pipe 13, and the emergency unloading pipe 14 can be arranged at equal intervals.

[0072] In some embodiments of the present invention, a pump tower base 50 is provided below the pump tower bottom plate 15. The lower end of the pump tower base 50 is fixed to the bottom of the storage tank, and the upper end passes through the pump tower bottom plate 15 and is connected to the pump tower bottom plate 15 through a top block 51 to limit the horizontal displacement of the pump tower.

[0073] In addition, as Figures 13 to 21As shown, the pump tower base 50 further includes a cylinder body 60. The lower part of the cylinder body 60 is fixedly connected to the bottom wall of the low-temperature liquid cargo storage tank. Support piles are symmetrically arranged about the cylinder body 61 in the middle of the cylinder body 61. A connecting gusset plate 63 is provided outside the cylinder body 61 at the upper part of the cylinder body 61. There are multiple top blocks 51 which are symmetrically arranged about the central axis in the vertical direction of the cylinder body 61. Among them, when limiting the position of the pump tower through the pump tower base 50, the upper connecting gusset plate 63 of the cylinder body 61 is made to pass upward through a limiting hole 53 opened at the center of the pump tower bottom plate 15 and adapted to the shape of the frame structure formed by connecting with the connecting gusset plate 63 in sequence. One side of the top block 51 is fixedly connected to the pump tower bottom plate 15 through a connecting elbow plate 52, and the other side of the top block 51 is used to fix the connecting gusset plate 63 that has passed upward through the pump tower bottom plate 15. The connection position between the top block 51 and the connecting gusset plate 63 is within a set area in the middle of the connecting gusset plate 63 in the vertical direction, and the distance between the inner side edges of the frame structure formed by connecting the connecting gusset plate 63 in sequence and the limiting hole 53 is not greater than 150 mm. That is, the gap between the frame structure formed by connecting the connecting gusset plate 63 in sequence and the limiting hole 53 can be 50 - 150 mm, so that when installing the pump tower, it is convenient for the pump tower base 50 to pass through the limiting hole 53 by adopting the above arrangement method, and the rapid positioning and assembly of the pump tower can be realized.

[0074] In some embodiments of the present invention, each support pile includes two support pile enclosures 65 arranged in parallel and fixedly connected to the outer wall of the cylinder body 61, a support pile panel 64 at the end of the support pile enclosure 65 far from the cylinder body 61 and fixedly connected to both support pile enclosures 65 at the same time, and a support pile flat plate 66 arranged between the two support pile enclosures 65 and fixedly connected to the outer wall of the cylinder body 61, the support pile panel 64 and the outer wall of the cylinder body 61 at the same time. The support pile enclosure 65, the support pile panel 64 and the cylinder body 61 enclose an approximately rectangular frame structure.

[0075] In some embodiments of the present invention, the connecting gusset plates 63 arranged at the upper part of the cylinder body 61 are 4 in number and are vertically arranged and connected to each other to form a square frame structure. The cylinder body 61 can specifically adopt a cylindrical cylinder body or a regular prism cylinder body; the top end of the connecting gusset plate 63 is flush with the upper end surface of the cylinder body 61. A support flat plate 68 parallel to the bottom of the low-temperature liquid cargo storage tank is provided in the middle of the square frame structure. The support flat plate 68 is in the middle area in the height direction of the connecting gusset plate 63 and is perpendicular or parallel to the connecting gusset plate 63.

[0076] In this embodiment, a plurality of horizontal reinforcing plates 67 are provided in the cylinder body 61 in sequence from top to bottom along its height direction, and at least some of the plurality of horizontal reinforcing plates 67 include horizontal reinforcing plates 67 respectively arranged in the same plane as the support pile flat plate 66, the support flat plate 68, and the connecting ring 62. That is, a horizontal reinforcing plate 67 is provided in the plane corresponding to the support pile flat plate 66, the support flat plate 68, and the connecting ring 62 to serve as the back support of the corresponding plate member and further strengthen the overall strength of the support pile. At the same time, the horizontal reinforcing plate 67 can be a flat plate structure adapted to the inner side wall of the cylinder body 61 or an annular plate structure whose outer side is adapted to the inner side surface of the cylinder body 61, and is specifically selected according to the strength requirements of the pump tower base 50. That is, if the cylinder body 61 is a cylindrical cylinder body, the horizontal reinforcing plate 67 can be a circular flat plate structure or a circular ring plate structure.

[0077] In some embodiments of the present invention, after the upper connecting fence 63 of the cylinder body 61 passes upward through the limiting hole 53 opened at the center of the pump tower bottom plate 15 and adapted to the shape of the frame structure formed by connecting the connecting fence 63 in sequence, the upper edge of the cylinder body 60 is 300 mm - 500 mm higher than the height of the pump body bottom plate, and the connecting fence 63 is located above the pump body bottom plate.

[0078] In some embodiments of the present invention, there are 4 connecting fences 63, and they enclose a square frame structure; there are 4 top blocks 51, and each corresponds to a connecting fence 63. Each top block 51 is located at the center position of the corresponding connecting fence; the top block 51 is specifically fixedly connected to the connecting elbow plate 52 welded and fixed on the pump tower bottom plate 15 through bolts, and the pump tower base 50 realizes the limitation of the pump tower through the top block 51.

[0079] In this embodiment, each top block 51 includes: a top block panel 72, which is provided with a card slot for embedding a top block connecting plate 73 on the side facing the connecting gusset plate 63. The card slot is opened in the central area of the top block panel 72, so that the top block connecting plate 73 after embedded installation is in the central area of the top block panel 72. Through the card slot, the top block panel 72 and the top block connecting plate 73 can be tightly connected. The top block connecting plate 73 is made of elastic PE material. Therefore, after the top block connecting plate 73 is connected to the connecting gusset plate 63, the connection tightness between the top block 51 and the connecting gusset plate 63 can be improved; two vertically arranged support plates 71 are fixedly arranged on the side of the top block panel 72 away from the connecting gusset plate 63 at intervals, and are perpendicular to the top block panel 72. Both vertically arranged support plates 71 are vertically arranged, and each vertically arranged support plate 71 is provided with an oblong hole 75 for fixedly connecting with the connecting rib plate 52; a horizontal support plate 74 is arranged between the two vertically arranged support plates 71 and is in the middle area in the height direction of the vertically arranged support plates 71. The horizontal support plate 74 is fixedly connected to the vertically arranged support plates 71 and the top block panel 72. Among them, the connecting elbow plate 52 is located at the upper end of the pump tower bottom plate 15 and is connected to other support members of the pump tower bottom plate 15 by welding. This layout can effectively transfer the support reaction force generated by the pump tower base 50 to other support members of the pump tower bottom plate 15, avoiding local stress concentration.

[0080] It can be seen from the above technical solutions that the pump tower for a liquid cargo storage tank provided in the above embodiment of the present invention adopts a variable cross-section structure. By reducing the space in the upper part of the pump tower, the lengths of the horizontal support 16 and the diagonal brace 17 are reduced, so as to reduce the construction cost of the pump tower. At the same time, the load bearing surface in the upper part of the pump tower can be reduced, which helps to reduce the load, and at the same time improve the stiffness of the pump tower structure and the structural strength of the pump tower; the design scheme expands the layout space for arranging equipment at the bottom of the pump tower, facilitating the layout of the unloading pump 18 and the design and construction of the pump tower bottom plate 15.

[0081] The above embodiments are only exemplary embodiments of the present invention and are not used to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements within the essence and protection scope of the present invention, and such modifications or equivalent replacements should also be regarded as falling within the protection scope of the present invention.

Claims

1. A pump tower for a cryogenic liquid cargo storage tank, characterized in that, Comprising: A first discharge pipe, a second discharge pipe, an injection pipe, and an emergency discharge pipe that are vertically arranged. Among them, The first discharge pipe, the second discharge pipe, the injection pipe, and the emergency discharge pipe are sequentially fixedly connected by parallel supports and form a prism structure with a quadrilateral cross-section; The first discharge pipe is provided with a first elbow in the middle and lower part of its height direction, and the first elbow is in the plane where the first discharge pipe and the emergency discharge pipe are located; The second discharge pipe is provided with a second elbow in the middle and lower part of its height direction, and the second elbow is in the plane where the second discharge pipe and the emergency discharge pipe are located; The injection pipe is provided with a third elbow in the middle and lower part of its height direction, and the third elbow is in the plane where the injection pipe and the emergency discharge pipe are located; Among them, the area of the quadrilateral cross-section formed by the part of the first discharge pipe below the first elbow, the part of the second discharge pipe below the second elbow, the part of the injection pipe below the third elbow, and the emergency discharge pipe is 2 to 3 times the area of the quadrilateral cross-section formed by the upper part of the first discharge pipe, the upper part of the second discharge pipe, the upper part of the injection pipe, and the upper part of the emergency discharge pipe, so as to form a space for arranging related equipment between the first discharge pipe, the second discharge pipe, the injection pipe, and the emergency discharge pipe.

2. The pump tower for a cryogenic liquid cargo storage tank according to claim 1, characterized in that, The first elbow, the second elbow, and the third elbow are all elbows with the same diameter, and are all the same as the diameter of the pipe they are connected to; Among them, the first elbow offsets the lower part of the first discharge pipe away from the emergency discharge pipe side, the second elbow offsets the lower part of the second discharge pipe away from the emergency discharge pipe side, and the third elbow offsets the lower part of the injection pipe away from the emergency discharge pipe side.

3. The pump tower for a cryogenic liquid cargo storage tank according to claim 1, characterized in that, The plane where the first discharge pipe and the second discharge pipe are located is parallel to the transverse plane perpendicular to the longitudinal direction of the ship they are on; The plane where the injection pipe and the emergency discharge pipe are located is parallel to the longitudinal plane parallel to the longitudinal direction of the ship they are on.

4. The pump tower for a cryogenic liquid cargo storage tank according to claim 1, characterized in that, The injection pipes are all fixedly connected to the parallel supports through pipe clamp components. The pipe clamp components can make the injection pipes move in the vertical direction and limit the movement of the injection pipes in the horizontal direction. The pipe clamp components include a pipe clamp sleeve and a pipe clamp pad. Among them, The pipe clamp sleeve is concentric with the injection pipe, and at least two pipe clamp pads fixedly connected to the pipe clamp sleeve are provided between the pipe clamp sleeve and the injection pipe, so as to form a spacing of at least 10 mm between the pipe clamp sleeve and the injection pipe, and enable the injection pipe to move in the vertical direction and be restricted in the horizontal direction.

5. The pump tower for a cryogenic liquid cargo storage tank according to claim 4, characterized in that, The injection pipe is fixedly connected to the parallel support through the pipe clamp sleeve, and at least one pipe clamp connecting gusset is provided at the connection between the pipe clamp sleeve and the parallel support.

6. The pump tower for a cryogenic liquid cargo storage tank according to claim 1, wherein the lower end of the injection pipe is fixedly connected to the pump tower bottom plate, and the lower end opening of the injection pipe is located below the pump tower bottom plate. A liquid impact prevention device is provided at the opening of the injection pipe to prevent liquid from directly impacting the cryogenic liquid cargo storage tank.

7. The pump tower for a cryogenic liquid cargo storage tank according to claim 6, wherein the lower ends of the first unloading pipe, the second unloading pipe, and the emergency unloading pipe are all fixed on the pump tower bottom plate; the quadrilateral cross-section formed by the first unloading pipe, the second unloading pipe, the injection pipe, and the emergency unloading pipe is square.

8. The pump tower for a cryogenic liquid cargo storage tank according to claim 6, wherein a pump tower base is provided below the pump tower bottom plate. The lower end of the pump tower base is fixed to the bottom of the storage tank, and the upper end passes through the pump tower bottom plate and is connected to the pump tower bottom plate through a top block to limit the horizontal displacement of the pump tower.

9. The pump tower for a cryogenic liquid cargo storage tank according to claim 1, wherein the parallel supports are multi-layered, and diagonal braces are provided between adjacent two layers of parallel supports to form an integral truss structure through the horizontal supports and the diagonal braces.

10. The pump tower for a cryogenic liquid cargo storage tank according to claim 9, wherein at least a unloading pump is arranged in the space for arranging relevant equipment, wherein at least two horizontal supports are arranged on the parallel support corresponding to the space for arranging relevant equipment to reserve a space for installing the unloading pump in the bow direction; each layer of the parallel supports in other layers of the multi-layer parallel supports is arranged with four horizontal supports.

Images