Pump tower for cryogenic-liquid cargo storage tank

Abstract

A pump tower for a cryogenic-liquid cargo storage tank. The pump tower comprises four vertical pipes, i.e., a first discharging pipe (11), a second discharging pipe (12), an injection pipe (13) and an emergency discharging pipe (14) which are vertically arranged, wherein the four vertical pipes are sequentially and fixedly connected by means of a horizontal support (16) and form a prism structure with a quadrilateral cross section; a first elbow (21) is provided at the lower middle portion of the first discharging pipe (11) in the heightwise direction thereof, and the first elbow (21) is located in the plane where the first discharging pipe (11) and the emergency discharging pipe (14) are located; a second elbow (22) is provided at the lower middle portion of the second discharging pipe (12) in the heightwise direction thereof, and the second elbow (22) is located in the plane where the second discharging pipe (12) and the emergency discharging pipe (14) are located; a third elbow (23) is provided at the lower middle portion of the injection pipe (13) in the heightwise direction thereof, and the third elbow (23) is located in the plane where the injection pipe (13) and the emergency discharging pipe (14) are located; and the area of the quadrilateral cross section formed by the portions of the three vertical pipes below the elbows and the emergency discharging pipe (14) is 2 to 3 times the area of the quadrilateral cross section formed by the upper portions of the four vertical pipes. By using a variable cross-section structure, the load of the upper portion of the pump tower can be reduced, the rigidity of the pump tower is improved, moreover, the arrangement space for arranging devices at the bottom is increased, and the design and construction of a pump tower bottom plate are facilitated.

Description

A pump tower for cryogenic liquid cargo storage tanks

[0001] Related applications

[0002] This application claims priority to Chinese patent application No. 202311169513.0 filed on September 12, 2023, and cites the contents disclosed in the above patent application as part of this application. Technical Field

[0003] The present disclosure 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

[0004] When transporting gases such as natural gas and ethane, in order to transport them over long distances more economically, it is usually necessary to cool the gas to a low temperature and transport the liquefied gas. After liquefaction, the volume of the gas is greatly reduced, and the transportation cost is reduced. The liquefied cryogenic liquid is stored and transported in a special cryogenic storage tank, and a pump tower is set inside the tank as a passage for the cryogenic liquid to enter and exit the tank. The pump tower set inside the cryogenic liquid cargo 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 crossbeams. Each riser is hollow and includes two unloading pipes and one emergency unloading pipe, arranged in a triangular cross-section. The injection pipe is arranged on the side of the emergency unloading pipe. Two unloading pumps are arranged accordingly at the bottom of the pump tower. Due to the limited space in the triangular cross-section, the arrangement at the bottom of the pump tower is very compact, which makes subsequent equipment maintenance inconvenient.

[0005] At sea, liquefied gas storage tanks can experience load sloshing due to surges. These sloshing movements can be quite violent within the tanks, generating significant loads within the tanks and particularly on equipment such as pump towers. Existing pump towers have a consistent shape from top to bottom, requiring additional reinforcement at the top where the load is greater, resulting in suboptimal structural strength.

[0006] Summary of the Invention

[0007] In view of the above-mentioned problems existing in the prior art, the embodiments of the present disclosure provide a pump tower for cryogenic liquid cargo storage tanks. The pump tower adopts a variable cross-section structure, which solves the problems existing in the above-mentioned background art. The pump tower provided by the present disclosure can be designed to have a narrower upper end while meeting the functional requirements of the pump tower, thereby reducing sloshing loads and improving the overall rigidity of the pump tower. At the same time, the lower end of the pump tower is appropriately expanded, optimizing the spatial layout and increasing the space at the bottom of the pump tower. This facilitates equipment layout and subsequent construction and maintenance, and is of great practical value.

[0008] The embodiment of the present disclosure provides a pump tower for a cryogenic liquid cargo storage tank, comprising: a first unloading pipe, a second unloading pipe, an injection pipe and an emergency unloading pipe arranged vertically, wherein:

[0009] The first unloading pipe, the second unloading pipe, the injection pipe and the emergency unloading pipe are fixedly connected in sequence by parallel supports to form a prism structure with a quadrilateral cross section;

[0010] The first unloading pipe is provided with a first elbow at the middle and lower part in the longitudinal direction thereof, and the first elbow is located in the plane where the first unloading pipe and the emergency unloading pipe are located;

[0011] The second unloading pipe is provided with a second elbow at the middle and lower part in the longitudinal direction thereof, and the second elbow is located in the plane where the second unloading pipe and the emergency unloading pipe are located;

[0012] The injection pipe is provided with a third elbow at the middle and lower part of the length direction thereof, and the third elbow is located in the plane of the injection pipe and the emergency unloading pipe;

[0013] Among them, the area of ​​the quadrilateral cross-section formed by the portion of the first unloading pipe at the lower part of the first elbow, the portion of the second unloading pipe at the lower part of the second elbow, the portion of the injection pipe at the lower part of 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 that space for arranging related equipment can be formed between the first unloading pipe, the second unloading pipe, the injection pipe and the emergency unloading pipe.

[0014] In some embodiments of the present disclosure, the first elbow, the second elbow, and the third elbow are all equal diameter elbows, and have the same diameter as the pipes to which they are connected;

[0015] The first elbow deviates the lower portion of the first unloading pipe away from the emergency unloading pipe, the second elbow deviates the lower portion of the second unloading pipe away from the emergency unloading pipe, and the third elbow deviates the lower portion of the injection pipe away from the emergency unloading pipe.

[0016] In some embodiments of the present disclosure, the planes in which the first unloading pipe and the second unloading pipe are located are parallel to a transverse plane perpendicular to the longitudinal direction of the ship in which they are located;

[0017] The planes on which the injection pipe and the emergency unloading pipe are located are parallel to a longitudinal plane parallel to the longitudinal direction of the ship on which they are located.

[0018] In some embodiments of the present disclosure, the injection pipes are fixedly connected to the parallel supports through pipe clamp components, which enable the injection pipes to 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, wherein:

[0019] The pipe clamp sleeve is concentrically arranged 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 that a spacing of at least 10 mm is formed between the pipe clamp sleeve and the injection pipe, and the injection pipe can move in the vertical direction and its movement in the horizontal direction is restricted.

[0020] In some embodiments of the present disclosure, the injection pipe is fixedly connected to the parallel support through the pipe clamp sleeve, and at least one pipe clamp connection elbow plate is provided at the connection between the pipe clamp sleeve and the parallel support.

[0021] In some embodiments of the present disclosure, the lower end of the injection pipe is fixedly connected to the bottom plate of the pump tower, and the lower end opening of the injection pipe is located at the lower part of the bottom plate of the pump tower. The opening of the injection pipe is provided with an anti-liquid impact device for preventing the liquid from directly impacting the liquid cargo storage tank.

[0022] In some embodiments of the present disclosure, the lower ends of the first unloading pipe, the second unloading pipe, and the emergency unloading pipe are all fixed to the bottom plate of the pump tower;

[0023] The quadrilateral cross section formed by the first unloading pipe, the second unloading pipe, the injection pipe and the emergency unloading pipe is arranged in a square shape.

[0024] In some embodiments of the present disclosure, 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.

[0025] In some embodiments of the present disclosure, the parallel supports are multi-layered, and diagonal supports are provided between two adjacent layers of parallel supports to form an overall truss structure through horizontal supports and diagonal supports.

[0026] In some embodiments of the present disclosure, at least a cargo unloading pump is arranged in the space for arranging relevant equipment, wherein:

[0027] At least two horizontal supports are arranged in parallel with the space for arranging relevant equipment, so as to reserve space for installing the unloading pump in the bow direction;

[0028] Each of the other layers of parallel supports in the multi-layer parallel support is arranged with four horizontal supports.

[0029] Compared to existing technologies, the pump tower for cryogenic liquid cargo storage tanks provided by the disclosed embodiments offers the following advantages: Its variable cross-section structure reduces the space above the pump tower and the length of horizontal and diagonal braces, thereby reducing pump tower construction costs. This also reduces the load-bearing surface above the pump tower, helping to reduce loads while also increasing the rigidity and strength of the pump tower structure. The design also expands the space available for equipment placement at the pump tower's base, facilitating the design and construction of the pump tower's baseplate. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] FIG1 is an axonometric diagram of a pump tower for a cryogenic liquid cargo storage tank provided by an embodiment of the present disclosure;

[0031] FIG2 is a front view schematic diagram of a pump tower for a cryogenic liquid cargo storage tank provided by an embodiment of the present disclosure;

[0032] FIG3 is a schematic top view of the upper portion of a pump tower for a cryogenic liquid cargo storage tank provided in an embodiment of the present disclosure;

[0033] FIG4 is a schematic top view of the lower portion of a pump tower for a cryogenic liquid cargo storage tank provided in an embodiment of the present disclosure;

[0034] FIG5 is a schematic top view of an injection pipe and an injection pipe clamp of a pump tower for a cryogenic liquid cargo storage tank provided by an embodiment of the present disclosure;

[0035] FIG6 is an axonometric diagram of an injection pipe clamp for a pump tower of a cryogenic liquid cargo storage tank provided by an embodiment of the present disclosure;

[0036] FIG7 is a side view schematic diagram of an injection pipe clamp for a pump tower of a cryogenic liquid cargo storage tank provided by an embodiment of the present disclosure;

[0037] FIG8 is an axonometric diagram of an injection pipe and a liquid impact prevention device of a pump tower for a cryogenic liquid cargo storage tank provided by an embodiment of the present disclosure;

[0038] FIG9 is an axonometric diagram of a liquid impact prevention device provided at an injection pipe opening of a pump tower for a cryogenic liquid cargo storage tank according to an embodiment of the present disclosure;

[0039] FIG10 is a schematic top view of a liquid impact prevention device provided at an injection pipe opening of a pump tower for a cryogenic liquid cargo storage tank according to an embodiment of the present disclosure;

[0040] FIG11 is a side view of a liquid impact prevention device provided at an injection pipe opening of a pump tower for a cryogenic liquid cargo storage tank according to an embodiment of the present disclosure;

[0041] FIG12 is a front view schematic diagram of a liquid impact prevention device provided at an injection pipe opening of a pump tower for a cryogenic liquid cargo storage tank according to an embodiment of the present disclosure;

[0042] FIG13 is an axonometric diagram illustrating the connection between a pump tower base and a pump tower bottom plate provided below a pump tower for a cryogenic liquid cargo storage tank according to an embodiment of the present disclosure;

[0043] FIG14 is a top view schematically illustrating the connection between a pump tower base provided below a pump tower for a cryogenic liquid cargo storage tank and a pump tower bottom plate provided in an embodiment of the present disclosure;

[0044] FIG15 is a schematic top view of AA in FIG14;

[0045] FIG16 is an axonometric diagram of a pump tower base provided below a pump tower for a cryogenic liquid cargo storage tank according to an embodiment of the present disclosure;

[0046] FIG17 is a schematic top view of a pump tower base provided below a pump tower for a cryogenic liquid cargo storage tank according to an embodiment of the present disclosure;

[0047] FIG18 is a side view schematic diagram of a pump tower base provided below a pump tower for a cryogenic liquid cargo storage tank according to an embodiment of the present disclosure;

[0048] FIG19 is a schematic central cross-sectional view of a pump tower base provided below a pump tower for a cryogenic liquid cargo storage tank according to an embodiment of the present disclosure;

[0049] FIG20 is an axonometric diagram of a top block of a pump tower base provided below a pump tower for a cryogenic liquid cargo storage tank according to an embodiment of the present disclosure;

[0050] 21 is a top view schematically illustrating a top block of a pump tower base provided below a pump tower for a cryogenic liquid cargo storage tank according to an embodiment of the present disclosure.

[0051] Reference numerals 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 support; 18, unloading pump; 19, liquid impact prevention device; 21, first elbow; 22, second elbow; 23, third elbow; 30, pipe clamp component; 31, pipe clamp connecting elbow plate; 32, pipe clamp spacer; 33, pipe clamp sleeve; 40, opening; 41, bottom plate; 42, side wall; 43, surrounding 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 elbow plate; 53, limiting hole; 61, cylinder; 62, connecting ring; 63, connecting enclosure; 64, support pile panel; 65, support pile enclosure; 66, support pile flat plate; 67, horizontal reinforcement plate; 68, support flat plate; 71, vertical support plate; 72, top block panel; 73, top block connecting plate; 74, horizontal support plate; 75, waist-round hole. DETAILED DESCRIPTION

[0052] In order to enable those skilled in the art to better understand the technical solutions of the present disclosure, the present disclosure is described in detail below with reference to the accompanying drawings and specific implementation methods.

[0053] Various aspects and features of the present application are described herein with reference to the accompanying drawings.

[0054] These and other characteristics of the present application will become apparent from the following description of a preferred form of embodiment given as a non-limiting example with reference to the accompanying drawings.

[0055] It should also be understood that although the present application has been described with reference to certain specific examples, those skilled in the art will be able to implement many other equivalent forms of the present application that have the features described in the claims and are therefore within the scope of protection defined thereby.

[0056] The above and other aspects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0057] Specific embodiments of the present application will be described below with reference to the accompanying drawings; however, it should be understood that the embodiments described are merely examples of the present application and may be implemented in a variety of ways. Familiar and / or repetitive functions and structures are not described in detail to clarify the true intent based on the user's historical operations and to avoid obscuring the present application with unnecessary or redundant details. Therefore, the specific structural and functional details described herein are not intended to be limiting, but rather serve merely as a basis and representative basis for the claims to teach those skilled in the art to use the present application in a variety of ways with substantially any appropriate detailed structure.

[0058] This specification may use the phrases "in one embodiment," "in another embodiment," "in a further embodiment," or "in other embodiments," which may all refer to one or more of the same or different embodiments according to the present application.

[0059] In this embodiment, an orthogonal frame defined by two axes x and y is used to describe the elements of the pump tower, wherein 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.

[0060] An embodiment of the present disclosure provides a pump tower for a cryogenic liquid cargo storage tank, wherein the cryogenic liquid cargo storage tank is specifically used to store liquid natural gas, ethane gas and other gases, and can be used as a cryogenic liquid cargo storage tank for a liquid transport ship, or as a cryogenic liquid cargo storage tank for other ships using cryogenic liquid cargo as fuel. As shown in Figures 1 to 21, the pump tower includes: a first unloading pipe 11, a second unloading pipe 12, an injection pipe 13 and an emergency unloading pipe 14 arranged vertically, wherein the first unloading pipe 11, the second unloading pipe 12, the injection pipe 13 and the emergency unloading pipe 14 are fixedly connected in sequence by parallel supports to form a prism structure with a quadrilateral cross-section, and a quadrilateral cross-section main frame is composed of four vertical pipes, namely, the four vertical pipes are connected to the parallel supports to define a quadrilateral cross-section prism;

[0061] At the same time, the first unloading pipe 11 is provided with a first elbow 21 at the middle and lower part in the height direction, and the first elbow 21 is in the plane where the first unloading pipe 11 and the emergency unloading pipe 14 are located; the second unloading pipe 12 is provided with a second elbow 22 at the middle and lower part in the height direction, and the second elbow 22 is in the plane where the second unloading pipe 12 and the emergency unloading pipe 14 are located; the injection pipe 13 is provided with a third elbow 23 at the middle and lower part in the height direction, and the third elbow 23 is in the plane where the injection pipe 13 and the emergency unloading pipe 14 are located; wherein, the portion of the first unloading pipe 11 below the first elbow 21, the portion of the second unloading pipe 12 below the second elbow 22, the portion of the injection pipe 13 below the third elbow 23 and the emergency unloading pipe 14 are located. The area of ​​the quadrilateral cross-section formed by the cargo pipe 14 is 2 to 3 times the area of ​​the quadrilateral cross-section formed by the upper part of the first unloading pipe 11, the upper part of the second unloading pipe 12, the upper part of the injection pipe 13 and the upper part of the emergency unloading pipe 14, so that space for arranging relevant equipment can be formed between the first unloading pipe 11, the second unloading pipe 12, the injection pipe 13 and the emergency unloading pipe 14, that is, through the first elbow 21, the second elbow 22 and the third elbow 23, the space formed by the first unloading pipe 11, the second unloading pipe 12, the injection pipe 13 and the emergency unloading pipe 14 in the lower area of ​​the pump tower is increased, thereby facilitating the installation and arrangement of equipment such as the unloading pump 18, and at the same time, the pump tower has a variable cross-section structure.

[0062] In some embodiments of the present disclosure, the first elbow 21, the second elbow 22, and the third elbow 23 are all equal-diameter elbows, and are the same diameter as the pipes to which they are connected. The third elbow 23 provides a certain degree of buffering when the liquid cargo flows through the injection pipe 13, preventing the liquid cargo from directly impacting the inner wall of the storage tank. The first elbow 21 deflects the lower portion of the first unloading pipe 11 away from the emergency unloading pipe 14, the second elbow 22 deflects the lower portion of the second unloading pipe 12 away from the emergency unloading pipe 14, and the third elbow 23 deflects the lower portion of the injection pipe 13 away from the emergency unloading pipe 14.

[0063] At the same time, in this embodiment, the planes in which 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 in which they are located; the planes in which 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 in which they are located, and the emergency unloading pipe 14 is located at the front end of the pump tower, the injection pipe 13 is located 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.

[0064] In some embodiments of the present disclosure, the parallel supports are multi-layered, and each layer of parallel supports is connected to four vertically arranged risers to form an annular support on the same horizontal plane, and a diagonal brace 17 is provided between two adjacent layers of parallel supports to resist the torque of the pump tower. By arranging horizontal supports 16 and 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.

[0065] In this embodiment, at least an unloading pump 18 is arranged in the space for arranging relevant equipment, wherein at least two horizontal supports 16 are arranged in the parallel supports corresponding to the space for arranging relevant equipment, that is, in order to enable the space to meet the space usage requirements for arranging equipment, the horizontal supports 16 of this part are only partially installed, thereby reserving space in the bow direction for installing the unloading pump 18. There can be two unloading pumps 18. In addition, an emergency pump can also be arranged in this space; each parallel support in other layers of the multi-layer parallel support is arranged with four horizontal supports 16.

[0066] In some embodiments of the present disclosure, when injecting cryogenic liquid cargo into the storage tank, the injection is performed through the injection pipe 13, which may cause a temperature difference between the injection pipe 13 and other pump tower components, resulting in asynchronous thermal expansion and contraction. If the injection pipe 13 is connected to the horizontal support 16 and the diagonal support 17 by welding, it will cause large temperature stress, causing structural safety risks. The injection pipe 13 is fixedly connected to the parallel support by a pipe clamp component 30. The pipe clamp component 30 can move the injection pipe 13 in the vertical direction and limit the movement of the injection pipe 13 in the horizontal direction. The pipe clamp component 30 is fixed to the parallel support 16 and the diagonal support 17. 0 can be multiple, that is, the injection pipe 13 is connected to a layer of parallel support 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, wherein the pipe clamp sleeve 33 is concentrically arranged 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 that a spacing of at least 10 mm is formed between the pipe clamp sleeve 33 and the injection pipe 13, and the pipe clamp pad 32 and the pipe clamp sleeve 33 are fixedly connected through a connecting piece, which can be a bolt or a rivet, etc.

[0067] 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 connection 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 fixedly connected to two horizontal supports 16 in the same layer at the same time. Then, a large-sized pipe clamp connection elbow plate 31 can be set between the two horizontal supports 16, and the large-sized pipe clamp connection elbow plate 31 is fixedly connected to the two horizontal supports 16 and the pipe clamp sleeve 33 at the same time. On the outside of the two horizontal supports 16 away from the large-sized pipe clamp connection elbow plate 31, a smaller-sized pipe clamp connection elbow plate 31 is respectively provided to fix the corresponding horizontal support 16 and the pipe clamp sleeve 33 respectively, thereby improving the stiffness of the connection position between the horizontal support 16 and the pipe clamp sleeve 33 and reducing local stress concentration.

[0068] In some embodiments of the present disclosure, the lower end of the injection pipe 13 is fixedly connected to the pump tower base plate 15. The injection pipe 13 is vertically arranged near the bottom of the storage tank, and the lower end opening of the injection pipe 13 is located at the lower part of the pump tower base 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 preventing the cryogenic liquid (liquid cargo) from directly impacting the liquid cargo storage tank when injected, slowing down the flow rate of the cryogenic liquid when injected through the injection pipe 13, and avoiding the influence of the fluid jet. As shown in Figures 8 to 12, the liquid impact prevention device 19 (or "fluid impact prevention device") includes: a bottom plate 41, which is provided below the opening 40 of the injection pipe 13 and has a guide surface formed on the 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. The bottom plate 41 is specifically provided below the opening 40 of the injection pipe 13 and maintains a distance from the opening 40; two parallel side walls 42, and the lower end of each side wall 42 is fixedly connected to the bottom plate 41, and each The upper ends of the side walls 42 are fixedly connected to the outer side walls 42 of the bottom end of the injection pipe 13 through horizontal fixing plates 44. The side walls 42 are the main supporting devices of the anti-fluid impact device; two surrounding walls 43 are respectively arranged between the two side walls 42. The two surrounding 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 surrounding wall 43 structure; wherein, at least one wall of the rectangular surrounding wall structure formed by the two side walls 42 and the two surrounding walls 43 is provided with a water flow hole, and in the rectangular The number of walls in the surrounding wall structure with water flow holes, as well as the number and opening size of the water flow holes are determined based on the flow rate and flow direction of the fluid after being diverted by the guide plate. That is, the flow rate and flow direction of the fluid diversion can be controlled by whether water flow holes are set on the side wall 42 or the surrounding wall 43, and by adjusting the opening size of the water flow holes, so that the fluid injected into the storage tank is deflected and preferably injected in the direction opposite to the equipment component to be protected. At the same time, the sum of the opening cross-sectional areas of all the water flow holes is greater than the cross-sectional area of ​​the opening 40 of the injection pipe 13.

[0069] In order to be able to guide the injected liquid more quickly, in some embodiments of the present disclosure, the bottom plate 41 is a spherical panel, and the raised side of the spherical panel faces the opening 40 of the injection pipe 13 as a guide surface, the center of the spherical panel is on the vertical axis of the injection pipe 13, and 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 in the horizontal plane, the bottom plate 41 of the spherical panel can make the vertically injected liquid produce a lateral velocity component, thereby realizing uniform and rapid diversion of the fluid to the surroundings, and can effectively reduce the impact load of the injected liquid on the bottom plate 41, thereby protecting the anti-fluid impact device.

[0070] In addition, in order to better guide the liquid, in this embodiment, the side wall 42 is a flat plate. If a first water flow hole 45 is opened 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 centrally arranged, and the upper part of the first water flow hole 45 is semi-circular and is arranged on the ground to achieve the diversion of the injected liquid and help to quickly discharge the fluid.

[0071] At the same time, in this embodiment, both side edges of the surrounding wall 43 are connected to the side walls 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 opened on the surrounding wall 43, the second water flow hole 46 is opened on the side of the surrounding wall 43 close to the bottom plate 41 and is centrally arranged, and is semi-circular, and is arranged on the ground to achieve diversion of the injected liquid and help to quickly discharge the fluid.

[0072] In this embodiment, a horizontal fixing plate 44 is located at the top of the side wall 42. Its side edge facing the injection pipe 13 is a circular arc-shaped side edge 47, and the radius of the circular arc-shaped side edge 47 is the same as the outer radius of the injection pipe 13. The horizontal fixing plate 44 is fixed to the outer wall of the injection pipe 13 by welding. The horizontal fixing plate 44 is located at a level higher than the level of the opening 40 of the injection pipe 13, and the vertical spacing is 30mm-100mm, which facilitates welding of the horizontal fixing plate 44. At the same time, the horizontal fixing plates 44 on both side walls 42 are arranged symmetrically with respect to the injection pipe 13 to effectively fix the fluid impact prevention device to the lower end of the injection pipe 13, prevent twisting of the fluid impact prevention device, and ensure the stability of the device.

[0073] 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 base 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 arranged in a square shape, that is, in the upper area 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.

[0074] In some embodiments of the present disclosure, 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.

[0075] In addition, as shown in Figures 13 to 21, the pump tower base 50 also includes a cylinder 60, the lower part of the cylinder 60 is fixedly connected to the bottom wall of the cryogenic liquid cargo storage tank, the middle part of the cylinder 61 is provided with a support pile symmetrically arranged about the cylinder 61, the upper part of the cylinder 61 is provided with a connecting panel 63 on the outside of the cylinder 61, and the top block 51 is multiple and symmetrically arranged about the center line of the vertical direction of the cylinder 61. When the position of the pump tower is limited by the pump tower base 50, the upper connecting panel 63 of the cylinder 61 is upwardly passed through the limiting hole 53 opened at the center of the pump tower bottom plate 15 and connected in sequence with the connecting panel 63 to form a frame structure, one side of the top block 51 is fixedly connected to the pump tower bottom plate 15 through the connecting elbow plate 52, and the other side of the top block 51 is fixed to the connecting panel 63 that has passed through the pump tower bottom plate 15 upward. The position where the top block 51 is connected to the connecting panel 63 is within the middle set area in the vertical direction of the connecting panel 63, and the spacing between the frame structure formed by the connecting panels 63 and the inner side edge of the limiting hole 53 is not greater than 150 mm, that is, the gap between the frame structure formed by the connecting panels 63 and the limiting hole 53 can be 50-150 mm, so that when the pump tower is installed, the above-mentioned arrangement method is adopted to facilitate the pump tower base 50 to pass through the limiting hole 53, thereby realizing rapid positioning and assembly of the pump tower.

[0076] In some embodiments of the present disclosure, each support pile includes two support pile walls 65 arranged in parallel and fixedly connected to the outer wall of the cylinder 61, a support pile panel 64 located at one end of the support pile walls 65 away from the cylinder 61 and fixedly connected to the two support pile walls 65, and a support pile flat plate 66 arranged between the two support pile walls 65 and fixedly connected to the outer wall of the cylinder 61, the support pile panel 64 and the outer wall of the cylinder 61. The support pile walls 65, the support pile panel 64 and the cylinder 61 together form a frame structure that is approximately rectangular.

[0077] In some embodiments of the present disclosure, the connecting panels 63 provided on the upper part of the cylinder 61 are connected into four pieces, arranged vertically, and connected to each other to form a square frame structure. The cylinder 61 can specifically be a cylindrical cylinder or a regular prism cylinder; the top end of the connecting panel 63 is flush with the upper end surface of the cylinder 61, and a supporting plate 68 is provided in the middle of the square frame structure, which is parallel to the bottom of the cryogenic liquid cargo storage tank. The supporting plate 68 is located in the middle area in the height direction of the connecting panel 63, and is arranged vertically or parallel to the connecting panel 63.

[0078] In this embodiment, a plurality of horizontal reinforcing plates 67 are sequentially provided in the cylinder 61 along its height direction from top to bottom, and the plurality of horizontal reinforcing plates 67 include at least horizontal reinforcing plates 67 respectively provided 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, further strengthening the overall strength of the supporting 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 61 or an annular plate structure whose outer edge is adapted to the inner side surface of the cylinder 61, and is selected specifically according to the strength requirements of the pump tower base 50, that is, if the cylinder 61 is a cylindrical cylinder, the horizontal reinforcing plate 67 can be a circular flat plate structure or a circular annular plate structure.

[0079] In some embodiments of the present disclosure, after the upper connecting panel 63 of the cylinder 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 the connecting panels 63 connected in sequence, the upper edge of the cylinder 60 is 300mm-500mm higher than the pump body bottom plate, and the connecting panels 63 are all located above the pump body bottom plate.

[0080] In some embodiments of the present disclosure, there are four connecting panels 63, which are enclosed to form a square frame structure; there are four top blocks 51, which correspond to one connecting panel 63 respectively, and each top block 51 is located at the center of the corresponding connecting panel; the top block 51 is fixedly connected to the connecting elbow plate 52 welded and fixed on the pump tower bottom plate 15 by bolts, and the pump tower base 50 limits the pump tower through the top block 51.

[0081] In this embodiment, each top block 51 includes: a top block panel 72, which has a card slot for embedding the top block connecting plate 73 on the side facing the connecting panel 63, and the card slot is opened in the central area of ​​the top block panel 72 so that the top block connecting plate 73 after embedding and installation is in the central area of ​​the top block panel 72. The card slot can make the top block panel 72 and the top block connecting plate 73 tightly connected through the card slot. The top block connecting plate 73 is made of elastic PE material, and after the top block connecting plate 73 is connected to the connecting panel 63, the connection between the top block 51 and the connecting panel 63 can be improved. Tightness; two parallel vertical support plates 71, which are fixed to the side of the top panel 72 away from the connecting panel 63 at intervals, and are arranged perpendicular to the top panel 72. The two vertical support plates 71 are arranged vertically, and each vertical support plate 71 is provided with a waist-shaped hole 75 for fixed connection with the connecting elbow plate 52 (or called "connecting rib"); a horizontal support plate 74, which is arranged between the two vertical support plates 71 and is in the middle area in the height direction of the vertical support plates 71. The horizontal support plate 74 is fixedly connected to the vertical support plates 71 and the top panel 72. Among them, the connecting elbow plate 52 is located at the upper end of the pump tower bottom plate 15 and is interconnected with other supporting components of the pump tower bottom plate 15 by welding. This arrangement can effectively transfer the support reaction force generated by the pump tower base 50 to other supporting components of the pump tower bottom plate 15, avoiding local stress concentration.

[0082] As can be seen from the above technical solutions, the pump tower for liquid cargo storage tanks provided in the above embodiments of the present disclosure utilizes a variable cross-section structure. This reduces the space above the pump tower and the lengths of the horizontal supports 16 and diagonal supports 17, thereby reducing the cost of pump tower construction. This also reduces the load-bearing surface area above the pump tower, helping to reduce loads while also increasing the rigidity and strength of the pump tower structure. The design also expands the space available for equipment placement at the bottom of the pump tower, facilitating the placement of the unloading pump 18 and the design and construction of the pump tower baseplate 15.

[0083] The above embodiments are merely exemplary embodiments of the present disclosure and are not intended to limit the present disclosure. The scope of protection of the present disclosure is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present disclosure within the essence and scope of protection of the present disclosure, and such modifications or equivalent substitutions shall also be deemed to fall within the scope of protection of the present disclosure.

Claims

1. A pump tower for a cryogenic liquid cargo storage tank, wherein: include: The first unloading pipe, the second unloading pipe, the injection pipe and the emergency unloading pipe are arranged vertically, wherein: The first unloading pipe, the second unloading pipe, the injection pipe and the emergency unloading pipe are fixedly connected in sequence through parallel supports to form a prism structure with a quadrilateral cross section; The first unloading pipe is provided with a first elbow at the middle and lower part in the height direction thereof, and the first elbow is located in the plane where the first unloading pipe and the emergency unloading pipe are located; The second unloading pipe is provided with a second elbow at the middle and lower part in the height direction thereof, and the second elbow is located in the plane where the second unloading pipe and the emergency unloading pipe are located; The injection pipe is provided with a third elbow at the middle and lower part of the injection pipe in the height direction, and the third elbow is located in the plane of the injection pipe and the emergency unloading pipe; Among them, the area of ​​the quadrilateral cross-section formed by the portion of the first unloading pipe at the lower part of the first elbow, the portion of the second unloading pipe at the lower part of the second elbow, the portion of the injection pipe at the lower part of 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 that space for arranging related equipment can be formed between the first unloading pipe, the second unloading pipe, the injection pipe and the emergency unloading pipe.

2. The pump tower for cryogenic liquid cargo storage tank according to claim 1, wherein: The first elbow, the second elbow and the third elbow are all equal diameter elbows, and have the same diameter as the pipes they are connected to; Among them, the first elbow causes the lower part of the first unloading pipe to shift away from the emergency unloading pipe side, the second elbow causes the lower part of the second unloading pipe to shift away from the emergency unloading pipe side, and the third elbow causes the lower part of the injection pipe to shift away from the emergency unloading pipe side.

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

4. The pump tower for cryogenic liquid cargo storage tank according to claim 1, wherein: The injection pipes are fixedly connected to the parallel supports through pipe clamp components, which enable the injection pipes to 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, wherein: The tube clamp sleeve is concentrically arranged with the injection pipe, and at least two tube clamp pads fixedly connected to the tube clamp sleeve are provided between the tube clamp sleeve and the injection pipe, so that a spacing of at least 10 mm is formed between the tube clamp sleeve and the injection pipe, and the injection pipe can move in the vertical direction and its movement in the horizontal direction is restricted.

5. The pump tower for cryogenic liquid cargo storage tank according to claim 4, wherein: The injection pipe is fixedly connected to the parallel support through the pipe clamp sleeve, and at least one pipe clamp connecting toggle plate is provided at the connection between the pipe clamp sleeve and the parallel support.

6. The pump tower for cryogenic liquid cargo storage tank according to claim 1, wherein: The lower end of the injection pipe is fixedly connected to the bottom plate of the pump tower, and the lower end opening of the injection pipe is located at the lower part of the bottom plate of the pump tower. The opening of the injection pipe is provided with an anti-liquid impact device for preventing liquid from directly impacting the cryogenic liquid cargo storage tank.

7. The pump tower for 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 bottom plate of the pump tower; The quadrilateral cross section formed by the first unloading pipe, the second unloading pipe, the injection pipe and the emergency unloading pipe is arranged in a square shape.

8. The pump tower for cryogenic liquid cargo storage tank according to claim 1, wherein: A pump tower base is arranged 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 cryogenic liquid cargo storage tank according to claim 1, wherein: The parallel supports are multi-layered, and diagonal supports are provided between two adjacent layers of parallel supports, so as to form an overall truss structure through horizontal supports and diagonal supports.

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

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