Immersed pump well pipe structure
By designing a submersible pump well pipe structure in an LNG storage tank, the heat exchange and thermal insulation layer are used to reduce temperature fluctuations, the problem of freeze-thaw circulation of concrete caused by the pump well pipeline structure is solved and the service life of concrete is extended.
Patent Information
- Application Number
- CN202421655826.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-12
- Publication Date
- 2025-04-11
- Estimated Expiration
- 2034-07-12
AI Technical Summary
In existing LNG storage tanks, the design of the pump well pipeline pipeline leads to a large fluctuation in the temperature inside the pipe, causing the concrete to be in an alternating cycle of freezing and thawing. The long-term freeze-thaw cycle destroys the gelling state of the concrete, causing the concrete to fail.
A submersible pump well pipe structure is designed, including a through-pipe, a first sleeve and a second sleeve. Heat exchange is performed with the first sleeve through the first cover plate. The first sleeve part exchanges heat with the external air. The unexposed concrete part exchanges heat with the air space on the upper air layer of the ceiling through the heat exchange chamber to avoid significant temperature changes and reduce changes in the concrete temperature.
It effectively avoids the freeze-thaw cycle of concrete, reduces changes in concrete temperature, extends the service life of concrete, and prevents concrete damage and failure.
Smart Images
Figure CN222747077U_ABST
Abstract
Description
Technical Field
[0001] The utility model generally relates to the field of LNG storage tanks, and in particular to a submersible pump well pipe structure. Background Art
[0002] Concrete fully contained LNG storage tanks are the core equipment of liquefied natural gas (LNG) receiving stations and natural gas liquefaction stations. A submersible pump well pipe is installed on the top of the LNG storage tank, vertically passing through the tank dome to the bottom of the tank. The function of the pump well pipe is to install a submersible pump in it to pump LNG through the pump well pipe to the outside of the tank.
[0003] The storage temperature of LNG in the tank is -165℃. The main structure of the fully contained concrete tank includes a concrete outer tank, a metal inner tank, and a ceiling panel, etc. The space inside the tank is divided into the inner space of the inner tank, the annular space between the inner and outer tanks, and the air layer space above the ceiling. The inner space of the inner tank mainly stores LNG, with a minimum temperature of -165℃; the annular space between the inner and outer tanks is filled with insulation materials; the air layer space above the ceiling is used as a gas storage space to adjust the pressure of the tank, and its minimum design temperature is higher than -40℃, which is a normal temperature environment (GB51081-2015 Technical Specifications for the Application of Concrete in Low Temperature Environments, Article 2.1.2 definition). In fact, the temperature of the air layer space above the ceiling of the operating tank is above 0℃ under various normal working conditions.
[0004] At present, the conventional pump well pipeline structure is designed as follows: a casing with a larger diameter than the through-tube is set at the position where the pipeline passes through the top of the storage tank, and the annular space formed by the casing and the through-tube is filled with insulation material. The cover plate on the top of the casing will form a cold bridge between the casing and the through-tube. The coldness of the deep cold medium in the through-tube will be transferred to the casing through the cold bridge, and then transferred to the concrete through the casing. Adjustments during the operation of the storage tank (such as switching of submersible pumps, feeding and discharging intervals) will cause the temperature in the through-tube to fluctuate greatly, which will cause the concrete outside the casing to be in an alternating cycle of freezing and melting (freeze-thaw cycle). Long-term freeze-thaw cycles will destroy the gelling state of the concrete, causing the concrete to fail. Utility Model Content
[0005] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a submersible pump well pipe structure that reduces the temperature change of concrete.
[0006] In the first aspect, the submersible pump well pipe structure of the utility model includes a through pipe, a first casing and a second casing, the first casing is sleeved on the through pipe, the second casing is sleeved on the first casing, the top of the first casing is fixedly connected with a first cover plate, the first cover plate is fixedly connected to the outer wall of the through pipe, an insulating cavity is arranged between the first casing and the through pipe, the insulating cavity is filled with insulating material to form an insulating layer, the top of the second casing is fixedly connected with a second cover plate, the second cover plate is fixedly connected to the outer wall of the first casing, a heat exchange cavity is arranged between the second casing and the first casing, the bottom of the heat exchange cavity is open, and the second casing passes through the concrete on the top of the storage tank.
[0007] According to the technical solution provided in the embodiment of the present application, when the temperature of the pipe fluctuates, heat exchange will be performed with the first sleeve through the first cover plate, and the portion of the first sleeve exposed to the concrete on the top of the tank will exchange heat with the outside air, and the portion of the first sleeve not exposed to the concrete on the top of the tank will exchange heat with the air layer space above the ceiling through the heat exchange cavity, avoiding large changes in the temperature of the first sleeve, and then avoiding large changes in the temperature of the second sleeve, thereby reducing the temperature change of the concrete and avoiding freeze-thaw cycles of the concrete. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:
[0009] Figure 1 A schematic structural diagram of a submersible pump well pipe structure according to an embodiment of the utility model;
[0010] Figure 2 for Figure 1 A partial enlarged view of the middle A;
[0011] Figure 3 for Figure 1 A partial enlarged view of point B in the middle;
[0012] Figure 4 For along Figure 1 Schematic cross-sectional view of the AA line;
[0013] Figure 5 For along Figure 1 Schematic cross-sectional view along line BB. DETAILED DESCRIPTION
[0014] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It is also necessary to explain that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings.
[0015] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0016] Please refer to Figures 1 to 5 The submersible pump well pipe structure of the utility model includes a through pipe 100, a first casing 200 and a second casing 300. The first casing 200 is sleeved on the through pipe 100, and the second casing 300 is sleeved on the first casing 200. A first cover plate 210 is fixedly connected to the top of the first casing 200, and the first cover plate 210 is fixedly connected to the outer wall of the through pipe 100. An insulating cavity is arranged between the first casing 200 and the through pipe 100, and an insulating material is filled in the insulating cavity to form an insulating layer 220. A second cover plate 310 is fixedly connected to the top of the second casing 300, and the second cover plate 310 is fixedly connected to the outer wall of the first casing 200. A heat exchange cavity 320 is arranged between the second casing 300 and the first casing 200, and the bottom of the heat exchange cavity 320 is open. The second casing 300 passes through the concrete 400 on the top of the storage tank.
[0017] In the embodiment of the utility model, the through pipe 100 is used for LNG to pass through, the second casing 300 passes through the top concrete 400 of the storage tank and the second casing 300 is fixed on the top concrete 400 of the storage tank. The through pipe 100 is fixedly connected to the first casing 200 through the first cover plate 210, and the first casing 200 is fixedly connected to the second casing 300 through the second cover plate 310, so that the submersible pump well pipe structure is fixed on the top concrete 400 of the storage tank as a whole.
[0018] An insulating cavity is formed between the first sleeve 200 and the through pipe 100, and the insulating cavity is filled with insulating material to form an insulating layer 220. The insulating layer 220 can reduce the heat exchange between the through pipe 100 and the first sleeve 200. The insulating material may be, but is not limited to, polyisocyanurate PIR or polyurethane foam PU or glass fiber insulating material. The first cover plate 210 is located at the top of the insulating cavity to prevent the insulating material from detaching from the insulating cavity from the top of the insulating cavity.
[0019] A heat exchange chamber 320 is provided between the second sleeve 300 and the first sleeve 200, and the bottom of the heat exchange chamber 320 is open, and the bottom of the heat exchange chamber 320 is connected with the space of the upper air layer 500 of the suspended ceiling. When LNG passes through the through pipe 100, the portion of the first sleeve 200 exposed from the concrete 400 on the top of the storage tank will exchange heat with the external air, and the portion of the first sleeve 200 not exposed from the concrete 400 on the top of the storage tank will exchange heat with the space of the upper air layer 500 of the suspended ceiling through the heat exchange chamber 320, thereby avoiding a large change in the temperature of the first sleeve 200, and further avoiding a large change in the temperature of the second sleeve 300, thereby reducing the temperature change of the concrete and avoiding freeze-thaw cycles of the concrete.
[0020] Furthermore, an annular heat-insulating plate 230 is detachably fixedly connected to the bottom of the first sleeve 200 , and the through-tube 100 passes through the annular heat-insulating plate 230 , and the shape of the annular heat-insulating plate 230 fits closely with the shape of the heat-insulating cavity.
[0021] In an embodiment of the utility model, during the operation stage of the storage tank, the through-tube 100 will shrink due to cold, causing the insulation material to be separated from the through-tube 100, and the flow of the medium or the pump well pipe will cause the vibration of the through-tube 100 due to the operation of the submersible pump. The shrinkage and vibration of the through-tube 100 due to cold will cause the insulation material in the insulation cavity to fall off, and the annular insulation plate 230 can prevent the insulation material from escaping from the insulation cavity.
[0022] The annular insulation plate 230 is detachably fixedly connected to the bottom of the first sleeve 200, which is convenient for filling the insulation cavity with insulation material and also convenient for replacing the insulation material in the insulation cavity.
[0023] Furthermore, a plurality of fixing plates 110 are fixedly connected to the inner wall of the first sleeve 200 at intervals, and the bolts 231 pass through the annular heat insulating plate 230 and are screwed to the fixing plates 110 .
[0024] In the embodiment of the utility model, a threaded hole can be provided on the fixing plate 110, and the bolt 231 passes through the annular heat insulating plate 230 and is screwed with the threaded hole, so that the annular heat insulating plate 230 is detachably fixedly connected to the bottom of the first sleeve 200. The fixing plate 110 is fixed to the inner wall of the first sleeve 200, and a plurality of fixing plates 110 are provided, and one fixing plate 110 corresponds to one bolt 231, thereby ensuring the reliability of the connection between the annular heat insulating plate 230 and the first sleeve 200. The fixing plate 110 can abut against the top surface of the annular heat insulating plate 230, and can position the annular heat insulating plate 230.
[0025] It is possible but not limited to that a plurality of fixing plates 110 are evenly distributed on the inner wall of the first sleeve 200 , so that the forces on the through pipe 100 and the annular insulation plate 230 are balanced.
[0026] Furthermore, a plurality of support plates 120 are fixedly connected to the outer wall of the through-tube 100 at intervals, and the plurality of support plates 120 respectively support the annular insulation plate 230 .
[0027] In the embodiment of the present utility model, a plurality of support plates 120 respectively support the annular heat insulating plate 230 to prevent the annular heat insulating plate 230 from being deformed, thereby ensuring the reliability of the annular heat insulating plate 230 in supporting the heat insulating material.
[0028] It is possible but not limited to that a plurality of support plates 120 are evenly distributed on the outer wall of the through-tube 100 , so that the through-tube 100 and the annular insulation plate 230 are subjected to balanced forces.
[0029] Furthermore, the material of the annular insulation plate 230 is HDPIR.
[0030] In the embodiment of the present invention, the material of the annular insulation board 230 is HDPIR, polyisocyanurate insulation pad (HDPIR) (PIR-Polyisocyanurate), also known as cryogenic tri-polyester foam, which is a new type of professional cryogenic insulation material with better physical properties and fire resistance than ordinary polyurethane, especially in terms of insulation effect and flame retardant properties.
[0031] Furthermore, a first reinforcement ring 130 is sleeved and fixed on the through-tube 100 . The first reinforcement ring 130 is located between the first cover plate 210 and the through-tube 100 . The first reinforcement ring 130 is fixedly connected to the first cover plate 210 .
[0032] In the embodiment of the utility model, the through-tube 100 and the first cover plate 210 are connected by the first reinforcement ring 130 , and the first reinforcement ring 130 can partially reinforce the through-tube 100 , thereby ensuring the reliability of the connection between the first cover plate 210 and the through-tube 100 .
[0033] Furthermore, a plurality of first ribs 140 are fixedly connected to the outer wall of the through-tube 100 , the plurality of first ribs 140 are respectively fixedly connected to the first cover plate 210 , and the plurality of first ribs 140 are respectively fixedly connected to the first reinforcement ring 130 .
[0034] In the embodiment of the present utility model, the connection between the first cover plate 210 and the first reinforcement ring 130 is strengthened by providing the first rib plate 140 , thereby improving the connection strength between the first cover plate 210 and the through pipe 100 .
[0035] Furthermore, a second reinforcement ring 240 is sleeved and fixed on the first sleeve 200 . The second reinforcement ring 240 is located between the second cover plate 310 and the first sleeve 200 . The second reinforcement ring 240 is fixedly connected to the second cover plate 310 .
[0036] In the embodiment of the utility model, the first sleeve 200 and the second cover plate 310 are connected by the second reinforcement ring 240 , and the second reinforcement ring 240 can partially reinforce the first sleeve 200 , thereby ensuring the reliability of the connection between the second cover plate 310 and the first sleeve 200 .
[0037] Furthermore, a plurality of second ribs 250 are fixedly connected to the outer wall of the second reinforcement ring 240 , and the plurality of second ribs 250 are fixedly connected to the second cover plate 310 , respectively.
[0038] In the embodiment of the present utility model, the connection between the second cover plate 310 and the second reinforcement ring 240 is strengthened by providing the second rib plate 250 , thereby improving the connection strength between the second cover plate 310 and the first sleeve 200 .
[0039] Furthermore, the vertical distance between the first cover plate 210 and the second cover plate 310 and the thickness of the insulation layer 220 satisfy the following relationship: a≥4b, wherein a is the vertical distance between the first cover plate 210 and the second cover plate 310 , and b is the thickness of the insulation layer 220 .
[0040] In the embodiment of the present utility model, the vertical spacing between the first cover plate 210 and the second cover plate 310 is ensured to be long enough, that is, the portion of the first sleeve 200 exposed from the concrete 400 on the top of the tank is ensured to be long enough, so as to facilitate sufficient heat exchange between the portion of the first sleeve 200 exposed from the concrete 400 on the top of the tank and the external air.
[0041] The second sleeve 300 may be made of low temperature carbon steel, such as 16MnDR. The through pipe 100, the first reinforcing ring 130, the first rib 140, the first cover plate 210, the first sleeve 200, the second reinforcing ring 240, the second rib 250 and the second cover plate 310 may be made of low temperature resistant material, such as S30408.
[0042] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the utility model involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the concept of the utility model. For example, the above features are replaced with the technical features with similar functions disclosed in the present application (but not limited to) by each other to form a technical solution.
Claims
1. A submersible pump well pipe structure, characterized in that: It includes a through-tube, a first sleeve and a second sleeve, the first sleeve is sleeved on the through-tube, the second sleeve is sleeved on the first sleeve, a first cover plate is fixedly connected to the top of the first sleeve, the first cover plate is fixedly connected to the outer wall of the through-tube, an insulating cavity is arranged between the first sleeve and the through-tube, the insulating cavity is filled with insulating material to form an insulating layer, a second cover plate is fixedly connected to the top of the second sleeve, the second cover plate is fixedly connected to the outer wall of the first sleeve, a heat exchange cavity is arranged between the second sleeve and the first sleeve, the bottom of the heat exchange cavity is open, and the second sleeve passes through the concrete on the top of the storage tank.
2. The submersible pump well pipe structure according to claim 1, characterized in that: An annular heat-insulating plate is detachably fixedly connected to the bottom of the first sleeve, the through-tube passes through the annular heat-insulating plate, and the shape of the annular heat-insulating plate fits and matches the shape of the heat-insulating cavity.
3. The submersible pump well pipe structure according to claim 2, characterized in that: A plurality of fixing plates are fixedly connected to the inner wall of the first sleeve at intervals, and bolts pass through the annular insulation plate and are screwed to the fixing plates.
4. The submersible pump well pipe structure according to claim 2, characterized in that: The outer wall of the through-tube is fixedly connected with a plurality of supporting plates at intervals, and the plurality of supporting plates respectively support the annular heat-insulating plate.
5. The submersible pump well pipe structure according to claim 2, characterized in that: The material of the annular thermal insulation board is HDPIR.
6. The submersible pump well pipe structure according to claim 1, characterized in that: The through-tube sleeve is fixed with a first reinforcement ring, the first reinforcement ring is located between the first cover plate and the through-tube, and the first reinforcement ring is fixedly connected to the first cover plate.
7. The submersible pump well pipe structure according to claim 6, characterized in that: The outer wall of the through-tube is fixedly connected with a plurality of first ribs, the plurality of first ribs are respectively fixedly connected with the first cover plate, and the plurality of first ribs are respectively fixedly connected with the first reinforcement ring.
8. The submersible pump well pipe structure according to claim 1, characterized in that: The first sleeve is sleeved and fixed with a second reinforcement ring, the second reinforcement ring is located between the second cover plate and the first sleeve, and the second reinforcement ring is fixedly connected to the second cover plate.
9. The submersible pump well pipe structure according to claim 8, characterized in that: A plurality of second ribs are fixedly connected to the outer wall of the second reinforcement ring, and the plurality of second ribs are fixedly connected to the second cover plate respectively.
10. The submersible pump well pipe structure according to claim 1, characterized in that: The vertical distance between the first cover plate and the second cover plate and the thickness of the insulation layer satisfy the following relationship: a ≥ 4b, Wherein, a is the vertical distance between the first cover plate and the second cover plate, and b is the thickness of the insulation layer.