CN116857553B - Cryogenic composite pipeline and application thereof - Google Patents
Cryogenic composite pipeline and application thereof Download PDFInfo
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- CN116857553B CN116857553B CN202311133651.3A CN202311133651A CN116857553B CN 116857553 B CN116857553 B CN 116857553B CN 202311133651 A CN202311133651 A CN 202311133651A CN 116857553 B CN116857553 B CN 116857553B
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- 239000002131 composite material Substances 0.000 title claims abstract description 30
- 239000007788 liquid Substances 0.000 claims abstract description 32
- 238000012546 transfer Methods 0.000 claims description 3
- 230000005489 elastic deformation Effects 0.000 abstract description 4
- 239000001257 hydrogen Substances 0.000 description 12
- 229910052739 hydrogen Inorganic materials 0.000 description 12
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 10
- 238000010586 diagram Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 238000009413 insulation Methods 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000008602 contraction Effects 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 238000012827 research and development Methods 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000003949 liquefied natural gas Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/004—Details of vessels or of the filling or discharging of vessels for large storage vessels not under pressure
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L51/00—Expansion-compensation arrangements for pipe-lines
- F16L51/02—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube
- F16L51/03—Expansion-compensation arrangements for pipe-lines making use of bellows or an expansible folded or corrugated tube comprising two or more bellows
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L51/00—Expansion-compensation arrangements for pipe-lines
- F16L51/04—Expansion-compensation arrangements for pipe-lines making use of bends, e.g. lyre-shaped
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/06—Arrangements using an air layer or vacuum
- F16L59/065—Arrangements using an air layer or vacuum using vacuum
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
- F17C2205/0352—Pipes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
- F17C2205/0352—Pipes
- F17C2205/0355—Insulation thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
- F17C2205/0352—Pipes
- F17C2205/0361—Pipes corrugated
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/01—Pure fluids
- F17C2221/012—Hydrogen
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The application provides a cryogenic composite pipeline and application thereof, wherein the pipeline is positioned between an inner tank body and an outer tank body of a liquefied gas storage tank, and comprises a first connecting pipe, a compensating pipe and a second connecting pipe which are sequentially connected from the top/wall of the inner tank outwards; the compensation tube forms a coil structure; and a vacuum tube is arranged on the outer side of the circumference of the second connecting tube, and the vacuum tube and the second connecting tube extend from the space between the inner tank and the outer tank to the outside of the storage tank. By designing the coil pipe structure of the compensation pipe, the application distributes the stress between the inner tank top and the pipeline to all parts of the compensation pipe during cold shrinkage, so that the compensation pipe only generates elastic deformation during cold shrinkage stretching, and the problem of damage to the inner and outer tank tops/walls and the pipeline caused by plastic deformation generated when the large cryogenic storage tank is filled with liquid during cold shrinkage is solved.
Description
Technical Field
The application belongs to the technical field of cryogenic liquid storage devices, and particularly relates to a cryogenic composite pipeline and application thereof.
Background
As a hydrogen storage mode, the liquid hydrogen has the obvious advantages of large storage weight ratio, low storage pressure and high vaporization purity, is convenient to store and transport, is safe and meets the terminal requirements, and the research and development of a large-scale liquid hydrogen film tank are particularly important, but the research and development of the technology of the large-scale liquid hydrogen film tank have the characteristics of low boiling point (20.3K) of the liquid hydrogen, small vaporization latent heat and easy evaporation, so that the problems of heat insulation, expansion and contraction of cold are required to be solved.
The low-temperature tank, the vehicle and the box have small volumes, the expansion and the cooling are reduced, the pipeline does not need to be subjected to vacuum heat insulation treatment, and the pipeline does not need to be designed in a targeted manner according to the expansion and the cooling shrinkage of the inner tank. The liquid pipeline of the bimetal cryogenic tank top liquid hydrogen film tank with thousands of square passes through the bimetal tank top, and simultaneously the superposition expansion of an inner tank and a pipe is considered, the radial expansion reaches more than 20mm, the vertical expansion reaches more than 50mm, the common pipeline design cannot adapt to low-temperature huge deformation, so that the tank body and the pipeline are fatigued and damaged, and plastic deformation is generated; if the leakage of the tank body is seriously possibly caused, huge safety risks and accident potential are caused. This is a technical problem faced in the design and manufacture of large cryogenic tanks at present.
Disclosure of Invention
In order to reduce the safety risks of equipment and personnel caused by the huge deformation of the inner tank body due to cold shrinkage in the existing cryogenic storage tank, a device needs to be developed to cope with the axial and radial cold shrinkage amount of the inner tank body.
The application provides a cryogenic composite pipeline which is positioned between an inner tank body and an outer tank body of a liquefied gas storage tank, wherein the pipeline comprises a first connecting pipe, a compensating pipe and a second connecting pipe which are sequentially connected from the top of the inner tank to the outside; the compensation tube forms a coil structure, and a vacuum tube is further arranged on the outer side of the circumference of the second connecting tube, and the vacuum tube and the second connecting tube extend from the space between the inner tank and the outer tank to the outside of the storage tank.
Preferably, the nominal diameter of the compensation tube is the same as that of the first connecting tube and the second connecting tube and is 10 mm-600 mm.
The length of the coil structure is determined by the specific spacing between the inner and outer roof sections and the amount of shrinkage. Preferably, the coil structure is annular or S-shaped.
The direction of the coil structure depends on the specific construction conditions. Preferably, the central axis direction of the annular coil structure is perpendicular or parallel to the horizontal plane.
Optionally, the pipeline is fixedly connected with the inner tank/outer tank through a sleeve assembly; the sleeve assembly comprises:
the rib plates are arranged on the outer wall of the composite pipeline;
the upper end plate and the lower end plate are arranged on the outer wall of the composite pipeline and are fixedly connected with the upper edge and the lower edge of the rib plate respectively;
and the sleeve is fixedly connected with the lower end plate and the tank wall.
Further, the vacuum tube also comprises a plurality of expansion joints, and the expansion joints are arranged outside the storage tank.
Preferably, the pipeline is further provided with a supporting component, and the supporting component comprises a supporting groove, a supporting rod and a supporting frame; the support groove is arranged on the top of the outer tank, a through hole is formed in the bottom of the support groove, one end of the support rod is a support rod end plate and is arranged in the support groove, and the other end of the support rod is a support frame and is used for providing supporting force for the compensation tube in a cryogenic state; the support frame is arranged on one side of the compensation pipe, which is far away from the first connecting pipe and the second connecting pipe.
Further, a heat insulating plate is further arranged in the supporting groove, penetrates through the through hole and is used for reducing heat transfer between the supporting groove and the supporting rod end plate as well as between the supporting groove and the supporting rod.
The structure can be applied to the tank top of a double-layer liquid storage tank and the wall surface of the double-layer liquid storage tank, and the liquid temperature is-269 ℃ to-40 ℃.
Compared with the prior art, the application has the beneficial effects that:
by designing the coil pipe structure of the compensation pipe, the application distributes the stress between the inner tank top and the pipeline to all parts of the compensation pipe during cold shrinkage, so that the compensation pipe only generates elastic deformation and does not generate plastic deformation during cold shrinkage stretching. The problem of the inner tank roof damage that can lead to when large-scale cryogenic storage tank lets in liquid shrinkage displacement of leading to probably is solved.
In addition, the application greatly reduces the dissipation of cold from the pipe wall and furthest reduces the possibility of heat dissipation by extending the vacuum pipe from between the inner tank body and the outer tank body to the outside of the tank.
When the storage tank is filled with cryogenic fluid, the support assembly provides supporting force for the compensation pipe, so that one side, far away from the first connecting pipe and the second connecting pipe, of the compensation pipe is prevented from collapsing downwards due to lack of support, and pressure loss is caused to the filling between the inner tank body and the outer tank body, and the service life of the compensation pipe is also influenced.
Drawings
FIG. 1 is a schematic diagram of a cryogenic tank top composite pipeline of the present application;
FIG. 2 is a schematic illustration of a single turn coil configuration of the compensation tube perpendicular to the horizontal plane;
FIG. 3 is a front view of a single turn coil structure of a compensation tube at room temperature;
FIG. 4 is a top view of FIG. 3;
FIG. 5 is a front view of a compensating tube single turn coil structure parallel to the horizontal plane at room temperature;
FIG. 6 is a top view of FIG. 5;
FIG. 7 is an exemplary diagram of a compensation tube S-coil configuration;
FIG. 8 is another exemplary diagram of a compensation tube S-coil configuration;
FIG. 9 is a schematic diagram of the force applied to the pipe without the coil structure in a simulation experiment;
FIG. 10 is a schematic diagram of the pipeline of FIG. 8 subjected to force everywhere under simulation;
FIG. 11 is a schematic diagram of the pipeline of FIG. 5 subjected to force everywhere under simulation;
fig. 12 is a schematic view of a support assembly.
Reference numerals:
1-a first connection tube; 2-compensating tube; 3-a second connection tube; 4-vacuum tube; 41-expansion joint; 5-a support assembly; 51-a supporting groove; 52-supporting rods; 53-supporting frame; 54-support rod end plates; 55-insulating board; 6-an inner tank top; 7-an outer tank top; 81-an upper end plate; 82-rib; 83-a lower end plate; 84-sleeve.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present application and are not to be construed as limiting the present application.
In the description of the present application, it should be understood that the terms "upper", "lower", "center", "axial", "radial", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present application, it should be noted that the terms "mounted," "connected," and "coupled" are to be construed broadly, as well as, for example, fixedly coupled, detachably coupled, or integrally coupled, unless otherwise specifically indicated and defined. Either mechanically or electrically. Can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not intended to be limiting with respect to time sequence, number, or importance, but are not to be construed as indicating or implying a relative importance or implicitly indicating the number of features indicated, but merely for distinguishing one feature from another in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly specified otherwise. Likewise, the appearances of the phrase "a" or "an" in this document are not meant to be limiting, but rather describing features that have not been apparent from the foregoing. Likewise, unless a particular quantity of a noun is to be construed as encompassing both the singular and the plural, both the singular and the plural may be included in this disclosure. Likewise, modifiers similar to "about" and "approximately" appearing before a number in this document generally include the number, and their specific meaning should be understood in conjunction with the context.
To simplify the present disclosure, components and arrangements of specific examples are described herein. They are, of course, merely examples and are not intended to limit the application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.
Each aspect or embodiment defined herein may be combined with any other aspect or embodiment unless clearly indicated to the contrary. In particular, any feature indicated as being preferred or advantageous may be combined with any other feature or features indicated as being preferred or advantageous.
The application discloses a cryogenic composite pipeline, which is shown in figure 1, and is positioned between the inner tank body and the outer tank body of a liquefied gas storage tank, communicated with the inner tank body and the outer tank body of the cryogenic storage tank and used for filling or discharging cryogenic liquefied gas, and comprises a first connecting pipe 1, a compensating pipe 2 and a second connecting pipe 3 which are sequentially connected from the inner tank top 6 outwards, wherein the compensating pipe 2 forms a coil structure. When the cryogenic storage tank starts to be filled with cooling liquid, the inner tank contracts sharply, the radial contraction thereof reaches more than 20mm, and the vertical contraction thereof reaches more than 50mm, so that the inner tank top 6 and the composite pipeline are damaged, and therefore the compensation pipe 2 needs to be designed to cope with the tensile deformation of the composite pipeline caused by the displacement of the inner tank when the inner tank contracts. For the design of the compensation tube 2, the displacement of the inner vessel in the radial and vertical direction is taken into account in combination. According to the application, multiple experiments are carried out on the compensation pipe 2 with different shapes, and when the compensation pipe 2 is designed into other forms, after the pipeline is cooled to be cryogenic, the compensation pipe 2, the inner tank top 6 and the outer tank top 7 are easy to generate plastic deformation under huge stress, and fatigue damage is easy to generate after the plastic deformation repeatedly happens for multiple times.
When the compensating pipe 2 is designed into a coil pipe structure, the stress born by the compensating pipe 2 is relatively small, and the stress is in the elastic deformation range of the compensating pipe 2, so that the compensating pipe 2 is not subjected to plastic deformation, and the fatigue of the compensating pipe 2, the inner tank top 6 and the outer tank top 7 is reduced to the greatest extent. The coil structure comprises various shapes, and at least one of annular shape and S-shape can be selected, and the annular coil structure is shown in fig. 3 to 6, and the projection shape of the annular coil structure on the horizontal plane comprises but is not limited to a rounded polygon. Wherein, fig. 3 and 4 are a design structure of the compensation tube, and fig. 5 and 6 are a design structure of the compensation tube 2; the two are in common that straight pipes and 90-degree bent pipes are alternately connected, so that the compensation pipe 2 is convenient to draw materials and install. The S-shaped coil structure is shown in fig. 7 and 8, wherein the sections of pipelines of the coil structure shown in fig. 7 are located on different planes, and the sections of pipelines of the coil structure shown in fig. 8 are located on the same plane.
The direction of the coil structure depends on the specific construction conditions. In some embodiments, as shown in fig. 2, the central axis direction D of the annular coil structure is parallel to the horizontal plane, in this way, when the pipeline is arranged on the tank top, the space on the tank top is saved during construction, and the pipeline is easy to construct.
The inner vessel is more contracted vertically, and thus the compensating pipe 2 is subjected to a larger stress in the vertical direction. In some embodiments, as shown in fig. 1, the central axis direction D of the annular coil structure is perpendicular to the horizontal plane, in this way, the stress between the inner tank top 6 and the pipeline is more evenly distributed around the compensating pipe 2, so that the situation of stress concentration is not easy to occur, and the long-term use of the pipeline is most facilitated; with this structure, moreover, the liquid does not remain in the compensation tube 2. As shown in fig. 9 to 11, simulation experiments were performed on stress conditions of coil structures of different shapes in a large storage tank of 1000m in cryogenic condition. Wherein, the pipeline is set as DN80 steel pipe. From FIG. 11, it can be seen that the stress maximum P is applied to each of the annular coil structures shown in FIGS. 1, 5 and 6 1 As can be seen from fig. 10, the S-shaped coil structure shown in fig. 7 (in which the spacing L of the transverse portions of the coil is 1000 mm) is subjected to a maximum stress P of each place = 155.26MPa 2 As can be seen from fig. 9, the maximum stress P experienced by the pipe without coil structure is = 220.13MPa 3 = 1648.7MPa. P can be seen as 1 ＜P 2 ＜P 3 . The coil pipe structure can be used for coping with the displacement of the inner tank body and reducing the pipeline and the tank topThe force is applied to avoid plastic deformation of the inner tank top or the inner tank wall and the pipeline, wherein the annular coil pipe structure shown in fig. 1, 5 and 6 is more preferable.
The length of the compensation tube 2 is determined by the specific distance between the inner tank top and the outer tank top and the cold shrinkage amount, so that when the inner tank top 6 is cold shrunk, the compensation tube 2 has enough allowance to elastically deform; in some embodiments, as shown in fig. 1-6, the coiled pipe structure is annular, and the number of turns is determined by the actual engineering requirement, and is generally more than 0.75 turns, so that the compensation pipe 2 can share the stress everywhere. The two compensating pipes 2 shown in fig. 3 to 6 have a coil structure with 1 turn.
In some embodiments, as shown in fig. 2, the pipeline is fixedly connected with the inner tank top 6 or the outer tank top 7 through a sleeve assembly; the sleeve assembly comprises: a plurality of rib plates 82 arranged on the outer wall of the first connecting pipe 1 or the second connecting pipe 3; the upper end plate 81 and the lower end plate 83 are arranged on the outer wall of the first connecting pipe 1 or the second connecting pipe 3 and are fixedly connected with the upper edge and the lower edge of the rib plate 82 respectively; a sleeve 84 fixedly connected to the lower end plate 83 and the tank wall. The sleeve assembly uses sleeve 84 to bear the stress of the inner tank top 6/outer tank top 7, and the sleeve 84 is fixedly connected with the composite pipeline through the lower end plate 83 and the rib plates 82, so that the stress is gradually conducted onto the composite pipeline, and the pipeline or the tank wall damage possibly caused by the direct connection of the composite pipeline and the tank wall is avoided.
In other embodiments, as shown in fig. 1, a vacuum tube 4 is further disposed at the outer side of the second connecting tube 3, the vacuum tube 4 and the second connecting tube 3 extend from between the inner tank and the outer tank to the outside of the storage tank, the arrangement of the vacuum tube 4 enhances the heat insulation effect of the composite pipeline, and particularly the vacuum tube 4 extends from between the inner tank and the outer tank to the outside of the storage tank, so that the dissipation amount of cold from the pipe wall is greatly reduced, and the possibility of heat dissipation is reduced to the greatest extent.
Further, the vacuum tube 4 further comprises a plurality of expansion joints 41, and the expansion joints 41 are arranged outside the storage tank. The expansion joint 41 cannot be provided in the tank in view of the safety risk of the cryogenic tank. When cryogenic liquid is introduced, the composite pipeline can shrink, and at the moment, the expansion joint 41 expands to provide allowance for the cold shrinkage of the composite pipeline, so that the composite pipeline is prevented from being damaged by deformation generated during cold shrinkage. The number of turns of the expansion joint 41 is determined according to the actual number of turns required by engineering.
In some embodiments, as shown in fig. 1 and 12, the composite pipeline is further provided with a support assembly 5. The supporting component 5 comprises a supporting groove 51, a supporting rod 52 and a supporting frame 53; the supporting groove 51 is arranged on the outer tank top 7, and a through hole is arranged at the bottom of the supporting groove 51; one end of the supporting rod 52 is a supporting rod end plate 54, which is disposed in the supporting groove 51, and the other end is a supporting frame 53, which is used for providing supporting force for the compensating tube 2 in a cryogenic state. When the storage tank is filled with cryogenic liquid, the inner tank drives the compensation tube 2, so as to drive the support frame 53 to displace downwards, so as to drive the support rod end plate 54 to be close to the support groove 51, so that the support rod end plate 54 is abutted against the support groove 51, thereby providing supporting force for the support frame 53 and the compensation tube 2, and the support frame 53 is arranged on one side far away from the first connecting tube 1 and the second connecting tube 3; the side, far away from the first connecting pipe 1 and the second connecting pipe 3, of the compensating pipe 2 is prevented from collapsing downwards due to lack of support, so that the packing between the inner tank body and the outer tank body is prevented from being damaged by pressure, and the service life of the compensating pipe 2 is also influenced.
In some embodiments, a heat insulation board 55 is further disposed in the supporting groove 51, and the heat insulation board 55 passes through the through hole, so as to reduce heat transfer between the supporting groove 51 and the supporting rod end plate 54, and the supporting rod 52, thereby reducing cold dissipation.
In some embodiments, the conduit is a metal conduit.
The application is applicable to any liquid storage tank comprising an inner tank body and an outer tank body. The pipeline structure of the application can be applied to the wall surface of the storage tank besides the tank top of the liquid double-layer storage tank, and the liquid temperature is lower than-40 ℃.
The present application is applicable to storing a variety of liquids, particularly liquefied gases in cryogenic conditions, including but not limited to: liquid nitrogen, liquid carbon dioxide, liquefied natural gas, liquid oxygen, liquid hydrogen, liquid helium, and the like. As shown in fig. 1, the piping structure with the vacuum pipe 4 is particularly suitable for a pressure tank, such as a large liquid hydrogen or liquid helium tank.
The following is a description of the embodiments.
Examples
The embodiment discloses a tank top pipeline structure of a large-scale liquid hydrogen storage tank. As shown in fig. 1, the structure comprises a first connecting pipe 1, a compensating pipe 2 and a second connecting pipe 3 which are sequentially connected from the inner tank top 6 outwards, wherein the compensating pipe 2 forms a coil structure, and the central axis direction D of the coil structure is perpendicular to the horizontal plane. A vacuum tube 4 is arranged outside the second connecting tube 3, and the vacuum tube 4 and the second connecting tube 3 extend from the space between the inner tank and the outer tank to the outside of the storage tank; the vacuum tube 4 further comprises a plurality of expansion joints 41, and the expansion joints 41 are arranged outside the storage tank. When liquid hydrogen enters the storage tank through the pipeline, the inner tank is contracted in the axial direction and the radial direction, so that inward and downward stress is generated on the inner tank top 6 and the pipeline structure simultaneously. The coil structure of the compensation tube 2 is in a stretched state along the axial direction and the radial direction of the inner tank, the stress is dispersed, and the compensation tube 2 only elastically deforms and does not plastically deform. When liquid hydrogen is introduced, the second connecting pipe 3 also suffers cold shrinkage, and the expansion joint 41 is used for providing the cold shrinkage allowance of the second connecting pipe 3. And after the liquid hydrogen is discharged from the tank, the inner tank top 6 and the pipeline structure are restored to the original state. This process may be repeated multiple times.
By designing the coil structure of the compensation tube, the application distributes the stress between the inner tank top 6 and the pipeline during cold shrinkage to all parts of the compensation tube 2, so that the compensation tube 2 only generates elastic deformation and does not generate plastic deformation. The problem of the interior tank deck damage that deformation that produces probably caused when large-scale cryogenic storage tank lets in liquid shrinkage is solved.
In addition, the application greatly reduces the dissipation of cold from the pipe wall and furthest reduces the possibility of heat dissipation by extending the vacuum pipe 4 from between the inner tank body and the outer tank body to the outside of the tank.
The support assembly plays a supporting role for the compensation tube 2. When the storage tank is filled with cryogenic fluid, the side, far away from the first connecting pipe 1 and the second connecting pipe 3, of the compensating pipe 2 is prevented from collapsing downwards due to lack of support, so that the packing between the inner tank body and the outer tank body is prevented from being damaged, and the service life of the compensating pipe 2 is also influenced.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present application, and is not intended to limit the present application, but although the present application has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the technical solutions described in the foregoing embodiments, or that equivalents may be substituted for part of the technical features thereof. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (8)
1. The cryogenic composite pipeline is characterized in that the pipeline is positioned between the inner tank body and the outer tank body of the liquefied gas storage tank, and comprises a first connecting pipe, a compensating pipe and a second connecting pipe which are sequentially connected outwards from the top or the wall of the inner tank; the compensation tube forms a coil structure; a vacuum tube is further arranged on the outer side of the circumference of the second connecting tube, and the vacuum tube and the second connecting tube extend from the space between the inner tank and the outer tank to the outside of the storage tank; the pipeline is also provided with a supporting component, and the supporting component comprises a supporting groove, a supporting rod and a supporting frame; the support groove is arranged on the top of the outer tank, a through hole is formed in the bottom of the support groove, one end of the support rod is a support rod end plate and is arranged in the support groove, and the other end of the support rod is a support frame and is used for providing supporting force for the compensation tube in a cryogenic state; the support frame is arranged on one side of the compensation pipe, which is far away from the first connecting pipe and the second connecting pipe.
2. The cryogenic composite pipeline of claim 1, wherein the nominal diameter of the compensation pipe is 10 mm-600 mm as the nominal diameter of the first connecting pipe and the nominal diameter of the second connecting pipe.
3. The cryogenic composite pipeline of claim 1, wherein the coiled tubing structure is annular or S-shaped in shape.
4. A cryogenic composite pipeline as claimed in claim 3 wherein the central axis of the annular coil structure is oriented either perpendicular or parallel to the horizontal plane.
5. The cryogenic composite pipeline of claim 1, wherein the pipeline is fixedly connected with the inner tank/outer tank through a sleeve assembly; the sleeve assembly comprises:
the rib plates are arranged on the outer wall of the composite pipeline;
the upper end plate and the lower end plate are arranged on the outer wall of the composite pipeline and are fixedly connected with the upper edge and the lower edge of the rib plate respectively;
and the sleeve is fixedly connected with the lower end plate and the tank wall.
6. The cryogenic composite pipeline of claim 1, wherein the vacuum tube further comprises a plurality of expansion joints, the expansion joints being disposed outside the storage tank to compensate for cold-shrink deformation of the pipeline outside the storage tank.
7. The cryogenic composite pipeline of claim 1, wherein the support groove is further provided with a heat insulating plate, and the heat insulating plate penetrates through the through hole and is used for reducing heat transfer between the support groove and the support rod end plate and the support rod.
8. The use of a cryogenic composite pipe according to any one of claims 1-7, wherein the cryogenic composite pipe is used on top of or on the wall of a double-layer tank for cryogenic liquids, the temperature of the liquids being-269 ℃ to-40 ℃.
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| CN116857553A (en) | 2023-10-10 |
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