CN112984282B

CN112984282B - Thermal insulation pipeline

Info

Publication number: CN112984282B
Application number: CN202110451488.XA
Authority: CN
Inventors: 沈君芳; 杜韧之; 陈波; 王贵东; 宫树战; 贾武江; 郝悦; 王瑞瑞; 盖莎莎
Original assignee: Shengli Oilfield Shengji Petroleum Equipment Co Ltd
Current assignee: Shengli Oilfield Shengji Petroleum Equipment Co Ltd
Priority date: 2021-04-26
Filing date: 2021-04-26
Publication date: 2021-09-03
Anticipated expiration: 2041-04-26
Also published as: CN112984282A

Abstract

The invention provides a heat preservation pipeline, which relates to the technical field of petrochemical industry and comprises an outer pipe, an inner pipe, a sealing assembly, a heat insulation structure and a thermal expansion compensator, wherein the outer pipe is arranged on the inner pipe; the outer pipe is sleeved on the outer periphery of the inner pipe, and an annular space is reserved between the outer pipe and the inner pipe; the outer pipe is provided with an air exhaust hole which is communicated with the annular space and can vacuumize the annular space; the sealing assembly is arranged between the outer pipe and the inner pipe and used for sealing the annular space; the heat insulation structure is positioned in the annular space and can block heat radiation; the thermal expansion compensator is arranged in the annular space and is used for compressing and deforming along the axial direction when the inner pipe is heated. The technical problems that the conventional heat insulation material in the prior art is affected by high heat conductivity coefficient of the heat insulation material and the heat insulation performance of a heat insulation pipeline is poor are solved, and the technical effect of excellent heat insulation performance is achieved.

Description

Thermal insulation pipeline

Technical Field

The invention relates to the technical field of petrochemical industry, in particular to a heat-insulating pipeline.

Background

With the continuous application and perfection of heat insulation technology in the fields of thickened oil thermal recovery and chemical heat medium storage and transportation, how to further reduce heat loss and further reduce energy consumption becomes a problem to be solved urgently. In the fields of thermal recovery steam injection ground pipeline transportation and high-temperature pipeline transportation in the chemical industry, a conventional thermal insulation material is generally adopted as a thermal insulation layer.

However, when the conventional heat insulating material is used for heat insulation, the heat insulating property of the heat insulating pipeline is poor due to the influence of high heat conductivity coefficient of the heat insulating material.

Disclosure of Invention

The invention aims to provide a heat insulation pipeline to solve the technical problems that the conventional heat insulation material in the prior art is influenced by high heat conductivity coefficient of the heat insulation material and has poor heat insulation performance.

In a first aspect, the present invention provides a thermal insulation pipeline comprising: the heat-insulation structure comprises an outer pipe, an inner pipe, a sealing assembly heat-insulation structure and a thermal expansion compensator; the outer pipe is sleeved on the outer periphery of the inner pipe, and an annular space is reserved between the outer pipe and the inner pipe; the outer pipe is provided with an air exhaust hole which is communicated with the annular space and can vacuumize the annular space; the sealing assembly is arranged between the outer pipe and the inner pipe and used for sealing the annular space; the heat insulation structure is positioned in the annular space and can block heat radiation; the thermal expansion compensator is arranged in the annular space and is used for compressing and deforming along the axial direction when the inner pipe is heated.

Further, the heat insulation structure is sleeved on the inner pipe, and a getter layer, a mirror reflection layer and a heat insulation layer are arranged on the heat insulation structure along the radial direction; the getter layer is closely abutted with the outer wall of the inner pipe, and the getter layer is used for maintaining a vacuum environment between the outer pipe and the inner pipe; the specular reflection layer is used for forming specular reflection to block heat radiation; the thermal insulation layer is used for blocking heat radiation through thermal insulation.

Further, the specular reflection layers and the heat insulation layers are alternately arranged in sequence and are respectively provided with a plurality of layers.

Further, the getter layer is made of a getter material in solid particles; the mirror surface reflecting layer adopts an aluminum foil layer; the heat insulation layer is a glass fiber gridding cloth layer.

Further, the sealing assembly comprises a front end cover and a welding ring which are tightly sleeved on the inner pipe; the outer end of the front end cover is welded with the outer pipe through a front end cover welding seam; the outer end of the welding ring is welded with the outer pipe through an outer ring welding seam, and the inner end of the welding ring is welded with the inner pipe through an inner ring welding seam.

Furthermore, the sealing assembly also comprises a rear end cover tightly sleeved on the inner pipe; the rear end cover is positioned between the front end cover and the welding ring, and one end of the rear end cover, facing the welding ring, is welded with the inner pipe through a rear end cover welding seam; the thermal expansion compensator is arranged between the front end cover and the rear end cover.

Furthermore, the thermal expansion compensator comprises a first pipe section, a second pipe section and a corrugated pipe section arranged between the first pipe section and the second pipe section, wherein the first pipe section, the second pipe section and the corrugated pipe section are integrally arranged and extend along the axial direction of the inner pipe; the first pipe section is fixedly connected with the inner end of the front end cover, and the second pipe section is fixedly connected with one end, facing the front end cover, of the rear end cover.

Further, a front compression block is sleeved at the inner end of the front end cover, and a rear compression block is sleeved at one end, facing the front end cover, of the rear end cover; the first pipe section is clamped between the front compaction block and the front end cover and welded with the front compaction block and the front end cover through a front welding seam; the second pipe section is clamped between the rear pressing block and the rear end cover, and the second pipe section, the rear pressing block and the rear end cover are welded through a rear welding seam.

Further, the sealing structure is sleeved on the inner tube and is located between the welding ring and the rear end cover.

Furthermore, a positioning guide pin is clamped between the front end cover and the inner tube, and the positioning guide pin is used for preventing the relative rotation of the outer tube and the inner tube.

Has the advantages that:

according to the heat preservation pipeline provided by the invention, the outer pipe is sleeved on the outer peripheral side of the inner pipe, the annular space is reserved between the outer pipe and the inner pipe, the sealing assembly is arranged between the outer pipe and the inner pipe and used for sealing the annular space, the outer pipe is provided with the air exhaust hole, when the air exhaust hole is communicated with the annular space, the annular space can be vacuumized, and the vacuum environment can block heat conduction and heat convection, so that a certain heat insulation effect can be achieved; simultaneously, still be equipped with thermal-insulated structure in the annular space, this thermal-insulated structure can block the heat radiation, can further improve the heat-proof quality of thermal insulation pipeline for thermal insulation performance of thermal insulation pipeline is more excellent.

From the foregoing, when the hot fluid passes through the inner tube, the inner tube is deformed by thermal elongation, and since a vacuum environment can be formed in the annular space and a heat insulation structure for blocking thermal radiation is provided in the annular space, the temperature of the outer tube is substantially kept unchanged, that is, no thermal elongation is generated.

Meanwhile, a thermal expansion compensator is further arranged in the annular space and can be used for compressing and deforming along the axial direction when the inner pipe is heated, so that the expansion compensation effect is achieved, and the outer pipe can not extend.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a cross-sectional view of an insulated pipeline provided in accordance with an embodiment of the present invention;

fig. 2 is a side view of an insulated pipeline provided in an embodiment of the present invention.

Icon:

10-an annular space; 20-front end cover weld; 30-outer circumferential weld; 40-inner girth weld; 50-rear end cap weld; 60-front weld; 70-rear welding line;

100-an outer tube; 110-air extraction holes;

200-an inner tube;

310-front end cap; 320-a solder ring; 330-rear end cap;

400-a thermally insulating structure;

500-a thermal expansion compensator; 510-a first tube segment; 520-a second pipe section; 530-bellows section;

600-front compaction block;

700-rear pressing block;

800-positioning the guide pin.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

In the general art, thermal pipelines block three main modes of propagation of heat: thermal conduction, thermal convection, and thermal radiation. The products appearing on the market can meet the requirement by using materials such as calcium silicate products, composite silicate products, rock wool products, slag wool products, glass wool products, aluminum silicate wool and products thereof, magnesium silicate fiber felts, flexible foam rubber and plastic products, hard polyurethane foam plastics, foam glass and the like as heat insulation materials for heat insulation. Among them, there is no measure for blocking the influence of the heat propagation means such as heat radiation, and the heat insulating property is poor.

The inventor researches a heat insulation pipeline in order to overcome the defect of poor heat insulation performance of the heat insulation pipeline in the prior art, and solves the technical problems that the conventional heat insulation material in the prior art is affected by high heat conductivity coefficient of the heat insulation material and poor heat insulation performance of the heat insulation pipeline in a mode of combining vacuum environment and blocking heat radiation. Next, the structure of the thermal insulation pipeline will be explained in detail with reference to the drawings.

Referring to fig. 1 and 2, the present embodiment provides an insulated pipeline including an outer pipe 100, an inner pipe 200, a sealing assembly, an insulation structure 400, and a thermal expansion compensator 500; the outer pipe 100 is sleeved on the outer periphery of the inner pipe 200, and an annular space 10 is left between the outer pipe and the inner pipe; the outer pipe 100 is provided with an air exhaust hole 110, and the air exhaust hole 110 is communicated with the annular space 10 and can vacuumize the annular space 10; the sealing assembly is arranged between the outer pipe 100 and the inner pipe 200 for sealing the annular space 10; the thermal insulation structure 400 is located in the annular space 10 and is capable of blocking thermal radiation; the thermal expansion compensator 500 is disposed in the annular space 10 for compressive deformation in the axial direction when the inner tube 200 is heated.

In the thermal insulation pipeline provided by the embodiment, the outer pipe 100 is sleeved on the outer peripheral side of the inner pipe 200, the annular space 10 is reserved between the outer pipe 100 and the inner pipe 200, the sealing assembly is arranged between the outer pipe 100 and the inner pipe 200 and used for sealing the annular space 10, the outer pipe 100 is provided with the air extraction hole 110, when the air extraction hole 110 is communicated with the annular space 10, the annular space 10 can be vacuumized, and the vacuum environment can block heat conduction and heat convection, so that a certain thermal insulation effect can be achieved; meanwhile, as the annular space 10 is also internally provided with the heat insulation structure 400, the heat insulation structure 400 can block heat radiation, so that the heat insulation performance of the heat insulation pipeline can be further improved, and the heat insulation performance of the heat insulation pipeline is more excellent.

As can be seen from the foregoing, when the hot fluid passes through the inner pipe 200, the inner pipe 200 is deformed by thermal elongation, and since a vacuum environment can be formed in the annular space 10 and the thermal insulation structure 400 for blocking thermal radiation is provided in the annular space 10, the temperature of the outer pipe 100 is substantially maintained, i.e., thermal elongation is not generated. Meanwhile, a thermal expansion compensator 500 is further arranged in the annular space 10, and the thermal expansion compensator 500 can be used for compressing and deforming along the axial direction when the inner pipe 200 is heated, so that an expansion compensation effect is achieved, and the outer pipe 100 can not extend.

In this embodiment, the pumping hole 110 is provided with a plugging member, wherein the plugging member plugs the pumping hole by welding after the vacuum pumping process is completed.

Specifically, the plugging member is opened, air in the closed annular space 10 is extracted from the air extraction hole 110 by a vacuum extraction technology, and the air extraction hole 110 is plugged by the plugging member under a high vacuum condition by a resistance welding technology, so that a high vacuum environment is manufactured to achieve the purpose of heat insulation.

In one embodiment of the present application, the heat insulation structure 400 is sleeved on the inner tube 200, and the heat insulation structure 400 is provided with a getter layer, a specular reflection layer and a heat insulation layer along a radial direction; the getter layer is closely abutted with the outer wall of the inner tube 200, and is used for maintaining a vacuum environment between the outer tube 100 and the inner tube 200; the specular reflection layer is used for forming specular reflection to block heat radiation; the thermal insulation layer serves to block heat radiation by thermal insulation.

It should be noted that the getter layer is used to maintain the vacuum environment between the outer tube 100 and the inner tube 200, which can be realized by those skilled in the art using the prior art.

Specifically, the specular reflection layers and the thermal insulation layers are alternately arranged in sequence and are respectively provided with a plurality of layers.

Optionally, the getter layer is disposed as one layer, and the specular reflection layer and the thermal insulation layer may be disposed as two, three or more layers.

Illustratively, the thermal insulation structure 400 is, in order from the inside to the outside: the getter layer, the specular reflection layer, the heat insulation layer, the specular reflection layer and the heat insulation layer are seven layers.

Specifically, the getter layer is made of a getter material in solid particles; the mirror surface reflecting layer adopts an aluminum foil layer; the heat insulation layer adopts a glass fiber gridding cloth layer.

The insulation structure 400 is described in detail above, followed by a detailed description of the seal assembly.

Referring to fig. 1, the sealing assembly includes a front end cap 310 and a weld ring 320 both tightly fitted over the inner tube 200; the outer end of the front end cover 310 is welded with the outer pipe 100 through a front end cover welding seam 20; the outer end of the welding ring 320 is welded with the outer pipe 100 through the outer ring welding seam 30, the inner end of the welding ring 320 is welded with the inner pipe 200 through the inner ring welding seam 40, the closed annular space 10 can be formed due to the arrangement, meanwhile, the two ends of the outer pipe 100 and the two ends of the inner pipe 200 are connected through welding, and the connection reliability of the outer pipe 100 and the inner pipe can be improved.

Further, the sealing assembly further includes a rear end cap 330 closely sleeved on the inner tube 200; the rear end cover 330 is positioned between the front end cover 310 and the welding ring 320, and one end of the rear end cover 330 facing the welding ring 320 is welded with the inner pipe 200 through a rear end cover welding seam 50; the thermal expansion compensator 500 is disposed between the front end cap 310 and the rear end cap 330, and thus the thermal expansion compensator 500 can bear a certain axial bearing force, so as to further prevent the outer tube 100 from being deformed by heat.

Specifically, the thermal telescopic compensator 500 includes a first pipe section 510, a second pipe section 520, and a bellows section 530 disposed therebetween, which are integrally disposed and extend in the axial direction of the inner pipe 200; the first tube section 510 is fixedly connected to the inner end of the front end cap 310, and the second tube section 520 is fixedly connected to the end of the rear end cap 330 facing the front end cap 310.

Referring to fig. 1, in specific use, since the end of the rear end cap 330 facing the weld ring 320 is welded to the inner pipe 200 by the rear end cap weld 50, when the front end of the inner pipe 200 is elongated by heat, the bellows section 530 of the thermal expansion compensator 500 is compressed leftward by the pulling force of the inner pipe 200, so as to compensate for the thermal deformation of the inner pipe 200, and the outer pipe 100 is not elongated.

It should be noted that, since the end of the rear end cap 330 facing the weld ring 320 is welded to the inner pipe 200 by the rear end cap weld 50 and the inner end of the weld ring 320 is welded to the inner pipe 200 by the inner ring weld 40, when the inner pipe 200 is heated and elongated, mainly the front end of the inner pipe 200 is heated and elongated.

Further, a front pressing block 600 is sleeved at the inner end of the front end cover 310, and a rear pressing block 700 is sleeved at one end of the rear end cover 330 facing the front end cover 310; the first tube section 510 is clamped between the front compaction block 600 and the front end cover 310, and the three are welded through a front welding seam 60; the second pipe section 520 is clamped between the rear pressing block 700 and the rear end cover 330, and the third pipe section, the rear pressing block 700 and the rear end cover 330 are welded through the rear welding seam 70, so that the connection reliability of the thermal telescopic compensator 500, the front end cover 310 and the rear end cover 330 can be further improved.

In this embodiment, the thermal insulation structure 400 is sleeved on the inner tube 200 and located between the welding ring 320 and the rear end cap 330.

On one hand, the thermal expansion compensator 500 is arranged between the front end cover 310 and the rear end cover 330, and meanwhile, the heat insulation structure 400 is arranged between the welding ring 320 and the rear end cover 330 in consideration of the convenience of arrangement of the heat insulation structure 400; on the other hand, the heat insulation structure 400 is closed, so that the heat insulation structure is not easy to be affected with damp, the stability of the heat insulation structure 400 is good, and the heat insulation service life is long.

Referring to fig. 1 and 2, a positioning guide pin 800 is interposed between the front end cap 310 and the inner pipe 200, and the positioning guide pin 800 is used for preventing the relative rotation between the outer pipe 100 and the inner pipe 200, and ensuring that the outer pipe 100 and the inner pipe 200 do not circumferentially rotate during transportation and use, thereby protecting the thermal telescopic compensator 500 from being damaged. In addition, both ends of the outer pipe 100 and the inner pipe 200 are welded, and the positioning guide pin 800 is adopted, so that the influence of circumferential rotation of the inner pipe and the outer pipe on the welding seam can be reduced, and the risk of the welding seam strength is low.

Alternatively, the positioning guide pin 800 may be provided in plurality, and the plurality of positioning guide pins 800 are arranged circumferentially.

In this embodiment, the outer pipe 100 and the inner pipe 200 may be welded by a circular seam welding structure, and the circular seam welding structure may be implemented by upsetting, flaring, or necking, which may further improve the quality of the weld joint.

Above the synthesis, the heat preservation pipeline has the following advantages:

(1) and a high vacuum heat insulation technology is adopted, so that the heat insulation performance is more excellent.

(2) The heat insulation structure 400 is not easy to be affected with damp, the heat insulation structure 400 is stable, and the heat insulation service life is long;

(3) the inner pipe 200 and the outer pipe 100 are welded at two ends, and the positioning guide pin 800 is adopted to reduce the influence of circumferential rotation of the inner pipe and the outer pipe on the welding line, so that the risk of the strength of the welding line is low.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An insulated pipeline, comprising: an outer tube (100), an inner tube (200), a sealing assembly, a thermal insulation structure (400), and a thermal expansion compensator (500);

the outer pipe (100) is sleeved on the outer peripheral side of the inner pipe (200), and an annular space (10) is reserved between the outer pipe and the inner pipe; an air suction hole (110) is formed in the outer pipe (100), the air suction hole (110) is communicated with the annular space (10), and the annular space (10) can be vacuumized;

the sealing assembly is arranged between the outer pipe (100) and the inner pipe (200) and is used for sealing the annular space (10);

the thermal insulation structure (400) is located in the annular space (10) and is capable of blocking thermal radiation;

the thermal expansion compensator (500) is arranged in the annular space (10) and is used for compressing and deforming along the axial direction when the inner pipe (200) is heated;

the heat insulation structure (400) is sleeved on the inner pipe (200), and a getter layer, a mirror reflection layer and a heat insulation layer are arranged on the heat insulation structure (400) along the radial direction;

the getter layer is closely abutted with the outer wall of the inner pipe (200), and the getter layer is used for maintaining a vacuum environment between the outer pipe (100) and the inner pipe (200);

the specular reflection layer is used for forming specular reflection to block heat radiation;

the thermal insulation layer is used for blocking heat radiation through thermal insulation;

the sealing assembly comprises a front end cover (310) and a welding ring (320), wherein the front end cover and the welding ring are tightly sleeved on the inner pipe (200); the outer end of the front end cover (310) is welded with the outer pipe (100) through a front end cover welding seam (20); the outer end of the welding ring (320) is welded with the outer pipe (100) through an outer girth weld (30), and the inner end of the welding ring (320) is welded with the inner pipe (200) through an inner girth weld (40);

the sealing assembly further comprises a rear end cap (330) tightly sleeved on the inner pipe (200); the rear end cover (330) is positioned between the front end cover (310) and the welding ring (320), and one end, facing the welding ring (320), of the rear end cover (330) is welded with the inner pipe (200) through a rear end cover welding seam (50); the thermal expansion compensator (500) is arranged between the front end cover (310) and the rear end cover (330);

the thermal expansion compensator (500) comprises a first pipe section (510), a second pipe section (520) and a corrugated pipe section (530) arranged between the first pipe section and the second pipe section, wherein the first pipe section, the second pipe section and the corrugated pipe section are integrally arranged and extend along the axial direction of the inner pipe (200); the first pipe section (510) is fixedly connected with the inner end of the front end cover (310), and the second pipe section (520) is fixedly connected with one end, facing the front end cover (310), of the rear end cover (330);

a front pressing block (600) is sleeved at the inner end of the front end cover (310), and a rear pressing block (700) is sleeved at one end, facing the front end cover (310), of the rear end cover (330); the first pipe section (510) is clamped between the front compaction block (600) and the front end cover (310), and the first pipe section, the front compaction block and the front end cover are welded through a front welding seam (60); the second pipe section (520) is clamped between the rear pressing block (700) and the rear end cover (330), and the second pipe section, the rear pressing block and the rear end cover are welded through a rear welding seam (70);

and a positioning guide pin (800) is clamped between the front end cover (310) and the inner pipe (200), and the positioning guide pin (800) is used for preventing the relative rotation of the outer pipe (100) and the inner pipe (200).

2. The thermal pipeline according to claim 1, wherein the specular reflection layer and the thermal insulation layer are alternately arranged in sequence and are respectively provided with a plurality of layers.

3. The insulated pipeline of claim 1 or 2, wherein the getter layer is made of a solid particulate getter material;

the mirror surface reflecting layer adopts an aluminum foil layer;

the heat insulation layer is a glass fiber gridding cloth layer.

4. The insulated pipeline of claim 1, wherein the insulation structure (400) is sleeved on the inner pipe (200) and is located between the weld ring (320) and the rear end cap (330).