CN114440014A - Heat-insulation and heat-preservation nonmetal composite pipe - Google Patents
Heat-insulation and heat-preservation nonmetal composite pipe Download PDFInfo
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- CN114440014A CN114440014A CN202011217275.2A CN202011217275A CN114440014A CN 114440014 A CN114440014 A CN 114440014A CN 202011217275 A CN202011217275 A CN 202011217275A CN 114440014 A CN114440014 A CN 114440014A
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- 239000002131 composite material Substances 0.000 title claims abstract description 34
- 238000009413 insulation Methods 0.000 title claims abstract description 33
- 229910052755 nonmetal Inorganic materials 0.000 title claims abstract description 11
- 238000004321 preservation Methods 0.000 title claims description 15
- 230000001681 protective effect Effects 0.000 claims abstract description 12
- 239000012774 insulation material Substances 0.000 claims abstract description 10
- 239000000835 fiber Substances 0.000 claims description 17
- 239000004964 aerogel Substances 0.000 claims description 13
- 238000005452 bending Methods 0.000 claims description 13
- 229920001169 thermoplastic Polymers 0.000 claims description 12
- 239000004416 thermosoftening plastic Substances 0.000 claims description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 9
- 229920005989 resin Polymers 0.000 claims description 8
- 239000011347 resin Substances 0.000 claims description 8
- 229920006351 engineering plastic Polymers 0.000 claims description 7
- 229920001721 polyimide Polymers 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 235000012239 silicon dioxide Nutrition 0.000 claims description 6
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 5
- 239000004433 Thermoplastic polyurethane Substances 0.000 claims description 5
- 239000000853 adhesive Substances 0.000 claims description 5
- 230000001070 adhesive effect Effects 0.000 claims description 5
- 230000002787 reinforcement Effects 0.000 claims description 5
- 229920002803 thermoplastic polyurethane Polymers 0.000 claims description 5
- 239000004642 Polyimide Substances 0.000 claims description 4
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 4
- 239000003822 epoxy resin Substances 0.000 claims description 4
- 239000002905 metal composite material Substances 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- 239000011496 polyurethane foam Substances 0.000 claims description 4
- XQUPVDVFXZDTLT-UHFFFAOYSA-N 1-[4-[[4-(2,5-dioxopyrrol-1-yl)phenyl]methyl]phenyl]pyrrole-2,5-dione Chemical compound O=C1C=CC(=O)N1C(C=C1)=CC=C1CC1=CC=C(N2C(C=CC2=O)=O)C=C1 XQUPVDVFXZDTLT-UHFFFAOYSA-N 0.000 claims description 3
- 229920002748 Basalt fiber Polymers 0.000 claims description 3
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 3
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 claims description 3
- 229920006231 aramid fiber Polymers 0.000 claims description 3
- 239000004917 carbon fiber Substances 0.000 claims description 3
- 229910052681 coesite Inorganic materials 0.000 claims description 3
- 230000000295 complement effect Effects 0.000 claims description 3
- 229910052906 cristobalite Inorganic materials 0.000 claims description 3
- 239000004643 cyanate ester Substances 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 229920003192 poly(bis maleimide) Polymers 0.000 claims description 3
- 239000009719 polyimide resin Substances 0.000 claims description 3
- 239000010453 quartz Substances 0.000 claims description 3
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 229910052682 stishovite Inorganic materials 0.000 claims description 3
- 229910052905 tridymite Inorganic materials 0.000 claims description 3
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 claims description 3
- 229920006337 unsaturated polyester resin Polymers 0.000 claims description 3
- 239000000805 composite resin Substances 0.000 claims description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 2
- 239000010779 crude oil Substances 0.000 abstract description 32
- 239000003921 oil Substances 0.000 abstract description 15
- 238000000034 method Methods 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 7
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- 230000004323 axial length Effects 0.000 description 2
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- 125000004122 cyclic group Chemical group 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
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- 239000004840 adhesive resin Substances 0.000 description 1
- 229920006223 adhesive resin Polymers 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
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- 230000008878 coupling Effects 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
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- 239000011159 matrix material Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
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- 239000004033 plastic Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
Images
Classifications
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- 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
- F16L9/00—Rigid pipes
- F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
-
- 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
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
- F16L57/02—Protection of pipes or objects of similar shape against external or internal damage or wear against cracking or buckling
-
- 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
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/028—Composition or method of fixing a thermally insulating material
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- 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
- F16L59/04—Arrangements using dry fillers, e.g. using slag wool which is added to the object to be insulated by pouring, spreading, spraying or the like
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Thermal Insulation (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Laminated Bodies (AREA)
Abstract
The invention discloses a heat-insulation nonmetal composite pipe, which comprises an innermost smooth inner layer, wherein a heat-insulation layer is arranged on the outer wall of the smooth inner layer, a pressure-resistant layer is arranged on the outer wall of the heat-insulation layer, and a protective outer layer is arranged on the outer wall of the pressure-resistant layer; the heat insulation layer is divided into an inner wall, an annular wave structure and an outer wall, the annular wave structure divides the inside of the heat insulation layer into alternate hollow cavities, and heat insulation materials are embedded into the cavities. The heat-insulating nonmetal composite pipe provided by the invention has excellent heat-insulating performance, the temperature drop of the conveyed crude oil per kilometer is small, and the purposes of reducing energy consumption and saving the production cost of an oil field in the process of conveying the crude oil are achieved.
Description
Technical Field
The invention relates to the technical field of composite pipes, in particular to a heat-insulation nonmetal composite pipe.
Background
In the crude oil transportation process, the transportation pipeline faces the problems of heat insulation, pressure resistance, transportation efficiency and the like, and provides a new technical challenge for the existing transportation pipeline. On the way of current oil pipeline carrying crude oil, because crude oil and environment carry out the heat exchange, so that crude oil per kilometer temperature drop is big, the temperature dip of crude oil leads to its viscosity to increase, easily cause the jam in the pipeline, influence the flow of crude oil in the pipeline, and can't guarantee crude oil transportation's security, influence the transport efficiency of crude oil, simultaneously for keeping the normal transport state of crude oil, need carry out the energy supply to the crude oil in the conveyer pipe, thereby the cost of crude oil exploitation has been improved. Therefore, research and development of a composite pipe to reduce heat exchange between crude oil in the pipe and the environment and reduce energy supply, thereby saving energy and reducing development cost become a technical problem to be solved by those skilled in the art.
Chinese patent CN201720787612.9 discloses a wear-resistant, heat-insulating and heat-preserving composite oil pipe with an inner liner, which is a multifunctional composite oil pipe composed of an anti-eccentric liner pipe, a pressure-bearing inner pipe, a heat-insulating layer, a steel oil pipe, and an anti-slip forced sealing device and a forced sealing device arranged at two ends of the oil pipe from inside to outside, wherein the processed oil pipe connects a plurality of oil pipes together by oil pipe couplings to be used in a well, which can effectively solve the eccentric wear of the rod pipe in the oil well, reduce the loss of the temperature of crude oil in the process of lifting the crude oil from the well bottom to the well top, increase the crude oil temperature in the well shaft and the well top, form wax and scale in the oil pipe, and improve the flow state of the crude oil in the well shaft. However, the processing technology of the composite oil pipe is complex, the mass of the composite oil pipe is large, the difficulty of long-distance transportation is increased, and meanwhile, the composite oil pipe is not beneficial to large-scale industrial production.
Chinese patent CN201821219038.8 discloses an aerogel heat insulation composite pipe, which comprises inner layer ultrahigh molecular polyethylene and outer layer crosslinked polyethylene with annular cross sections and sleeved together and infinitely extending to both ends along the axial direction, a steel wire mesh protection heat insulation layer with the axial length consistent with the axial length of the inner and outer layers is integrally arranged between the inner layer ultrahigh molecular polyethylene and the outer layer crosslinked polyethylene, the steel wire mesh protection heat insulation layer is composed of a steel wire mesh framework and aerogel solution, and the aerogel solution is coated on the steel wire mesh framework. According to the composite pipe, the aerogel solution is coated on the steel wire mesh framework, so that the aerogel is filled in the grids of the steel wire mesh framework to form a three-dimensional interweaving structure, the performances of the pipeline, such as wear resistance, pressure resistance, impact resistance, folding resistance, heat preservation and the like, are improved, but the temperature drop of conveyed crude oil per kilometer cannot be reduced by less than 4 ℃, so that the energy consumption is reduced in the conveying process of the crude oil, and the purpose of saving the production cost of an oil field is achieved.
The crude oil that present thermal-insulated heat preservation composite pipe carried falls greatly every kilometer temperature, the high efficiency of crude oil long distance transport of assurance that can not be fine, and simultaneously under high-pressure operational environment, the compressive property of composite pipe is lower, can't satisfy crude oil transport under the adverse circumstances.
Disclosure of Invention
In view of the above, the present invention provides a heat insulation non-metal composite pipe to further improve the above problems.
For this purpose, the present invention is implemented by the following technical means.
A heat insulation and preservation non-metal composite pipe mainly comprises a smooth inner layer of an innermost layer, wherein a heat insulation and preservation layer is arranged on the outer wall of the smooth inner layer, a pressure resistant layer is arranged on the outer wall of the heat insulation and preservation layer, and a protective outer layer is arranged on the outer wall of the pressure resistant layer;
the heat insulation layer is of a multilayer structure and sequentially comprises an inner wall, an annular wave structure and an outer wall from inside to outside; and the annular wave structure is filled with heat insulation materials.
Furthermore, the smooth inner layer is made of thermoplastic engineering plastics.
Further, a cavity clamping structure is formed between the inner wall and the outer wall, and the cavity clamping structure is supported by the annular wavy structure; the section of the annular wave structure is in an annular wave shape, and the clamping cavity is divided into alternate hollow cavities; and the hollow cavity is filled with heat insulation materials.
Furthermore, any side of the annular wavy structure forms a bending angle alpha with the tangential direction close to the top point of the inner side, and the bottom of the annular wavy structure forms a bending angle beta complementary to the alpha; the thickness of the annular wavy structure is a, and the height of a single side is h; wherein the bending angle α is 45 °, the bending angle β is 45 °, a is 7mm, and h is 20 mm.
Furthermore, the inner wall, the annular wave structure and the outer wall of the heat insulation layer are all made of hard polyurethane foam plastics.
Furthermore, the heat insulation material is a basalt fiber-thermoplastic polyurethane-SiO 2 aerogel composite material, wherein the ratio of the basalt fiber to the thermoplastic polyurethane to the SiO2 aerogel is 1:1: 18.
Further, the material of the pressure-resistant layer is a fiber reinforced resin matrix composite material, and the fiber reinforcement comprises one or more of carbon fiber, glass fiber, quartz fiber, aramid fiber, ultra-high molecular weight polyethylene fiber and polyimide fiber; the resin comprises one or more of epoxy resin, polyimide resin, bismaleimide resin, cyanate ester and unsaturated polyester resin.
Furthermore, the material of the protective outer layer is thermoplastic engineering plastic.
Furthermore, adjacent two layers of the smooth inner layer, the heat insulation layer, the pressure resistant layer and the protective outer layer are fixedly connected through an adhesive.
The invention has the following advantages:
according to the invention, through the heat insulation layer with the annular wave structure, the heat exchange between the crude oil and the environment is effectively reduced, the temperature of the crude oil per kilometer is reduced, the crude oil can smoothly circulate in a pipeline, the safety of crude oil transportation is ensured, the crude oil transportation efficiency is improved, the energy consumption of the crude oil in the transportation process is reduced, and the oil field production cost is saved; and meanwhile, the pressure-resistant layer and the protective outer layer are combined, so that the pipeline has good pressure resistance, can adapt to severe environment, and can be used as a crude oil exploitation conveying pipe.
Drawings
In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the embodiments will be briefly described below, it is obvious that the drawings in the following description are only one or several embodiments of the present invention, and that other drawings can be obtained by those skilled in the art without inventive effort.
The location and number of identical structures shown in the drawings are merely for convenience in describing the invention and do not indicate or imply that the structures referred to must have a particular orientation, number of distributions and are therefore not to be considered limiting.
FIG. 1 is a schematic cross-sectional view of a composite pipe according to the present invention;
fig. 2 is a partially enlarged view of a portion a in fig. 1.
In the figure:
1-smooth inner layer; 2-heat insulation layer; 3-a pressure resistant layer; 4-protective outer layer; 5-inner wall; 6-ring wave structure; 7-outer wall.
Detailed Description
In the description of the present invention, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in fig. 1. Such terms are merely used to facilitate describing the invention and to simplify the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
The invention will be further described with reference to fig. 1 and 2.
A thermal-insulated heat preservation non-metallic composite pipe, as shown in figure 1, includes smooth inlayer 1 of inlayer, sets up thermal-insulated heat preservation 2 at the outer wall of smooth inlayer 1, and the outer wall of thermal-insulated heat preservation 2 sets up resistance to compression layer 3, and the outer wall of resistance to compression layer 3 sets up protection skin 4. Wherein, thermal-insulated heat preservation 2 is multilayer structure, from interior to exterior divide into inner wall 5, cyclic annular wave structure 6 and outer wall 7 again, and cyclic annular wave structure 6 is divided into alternate cavity with thermal-insulated heat preservation inside to imbed thermal-insulated insulation material in the cavity.
Preferably, the smooth inner layer 1, the heat insulation layer 2, the pressure-resistant layer 3 and the protective outer layer 4 are fixedly connected with each other through an adhesive.
The smooth inner layer 1 is formed by extruding thermoplastic engineering plastics, the thermoplastic engineering plastics are thermoplastic polyurethane, and the thickness of the smooth inner layer 1 is 1-20 mm.
Preferably, a cavity-clamping structure is formed between the inner wall 5 and the outer wall 7, and the cavity-clamping structure is supported by the annular wavy structure 6; as shown in fig. 1, the cross section of the annular wave structure 6 is in an annular wave shape, and divides the clamping cavity into alternate hollow cavities; meanwhile, the annular wave structure 6 provides a supporting function for the cavity, and heat insulation materials are embedded in the cavity. Wherein the inner wall 5, the annular wave structure 6 and the outer wall 7 are constructed from rigid polyurethane foam made by foaming. The thickness of the inner wall 5 and the outer wall 7 of the heat insulation layer is 1-5 mm. The width of the annular wave structure 6 is 10mm-25mm, and the thickness is 1-10 mm. The connection between the inner wall 5 and the outer wall 7 of the heat insulation layer and the annular wavy structure 6 is bonded by an adhesive.
Preferably, as shown in fig. 2, any side of the annular wavy structure 6 forms a bending angle α with the tangential direction near the inner vertex, and the bottom forms a bending angle β complementary to α; the thickness of the annular wave structure 6 is a, the height of a single side is h (the difference from the top to the adjacent bottom is measured along the radial direction of the vertex with the tangential line of the top of the wave as the reference). Further, the thickness of the inner wall 5 and the outer wall 7 of the heat insulation layer is set to be 3mm, and the annular wavy structures 6 with different sizes are subjected to compression resistance test, and the test results are shown in the following tables 1 and 2.
| Serial number | α(°) | β(°) | Compressive strength (MPa) |
| 1 | 30 | 60 | 0.25 |
| 2 | 45 | 45 | 0.32 |
| 3 | 60 | 30 | 0.27 |
TABLE 1 test of bending angle to compression strength of annular wave structure
| Serial number | a(mm) | h(mm) | Compressive strength (MPa) |
| 1 | 3 | 10 | 0.26 |
| 2 | 5 | 15 | 0.31 |
| 3 | 7 | 20 | 0.36 |
| 4 | 10 | 25 | 0.29 |
TABLE 2 testing of the thickness and height of the wave structure to the compressive strength of the annular wave structure
As can be seen from the test results, the optimal solution of the comprehensive compressive strength is not a common equilateral triangle structure, so the bending angle α is preferably 45 °, and the bending angle β is 45 °; it can be further concluded that the overall compressive strength is optimal when the thickness a is 7mm and the height h of the single edge is 20 mm.
Preferably, the heat insulation material is a basalt fiber-thermoplastic polyurethane-SiO 2 aerogel composite material.
Thermal performance tests were performed on basalt fiber-thermoplastic polyurethane-SiO 2 aerogel composites of different component ratios, the thermal conductivities of which are shown in table 3. From the test results, when the ratio of the basalt fibers, the thermoplastic polyurethane and the SiO2 aerogel is 1:1:18, the thermal conductivity is lowest, and the thermal insulation performance is best. Therefore, the ratio of the components is preferably 1:1: 18.
TABLE 3 testing of composite component ratios versus composite thermal conductivity
The pressure-resistant layer 3 is made of fiber-reinforced resin-based composite materials, and the fiber reinforcement comprises one or more mixed fiber reinforcements of carbon fibers, glass fibers, quartz fibers, aramid fibers, ultra-high molecular weight polyethylene fibers and polyimide fibers. The resin comprises one or more of epoxy resin, polyimide resin, bismaleimide resin, cyanate ester and unsaturated polyester resin. In this embodiment, the fiber reinforcement is selected from polyimide fibers, and the resin is selected from epoxy resin, wherein the ratio is 1: 9. The thickness of the pressure-resistant layer 3 is 1-20 mm.
The protective outer layer 4 is made of thermoplastic engineering plastics, thermoplastic polyurethane elastomer rubber is selected for extrusion molding, and the thickness of the protective outer layer 4 is 1-20 mm.
The adhesive among the smooth inner layer 1, the heat insulation layer 2, the compression resistant layer 3 and the protective outer layer 4 is adhesive resin.
The heat-insulating non-metal composite pipe in the embodiment is subjected to a conveying temperature simulation test, so that a simulation test result that the temperature drop of crude oil per kilometer is less than 4 ℃ can be obtained. Because the heat-insulating layer in the heat-insulating nonmetal composite pipe is made of rigid polyurethane foam, and the embedded annular wave structure is adopted to support the heat-insulating layer, the hollow structure which is alternated up and down is constructed, and the novel heat-insulating material basalt fiber-thermoplastic polyurethane-SiO 2 aerogel filled in the hollow structure plays an excellent heat-insulating role, and reduces the heat exchange between crude oil and the environment.
Although the present invention has been described in detail with reference to examples, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. The heat-insulation and heat-preservation nonmetal composite pipe is characterized by comprising an innermost smooth inner layer (1), wherein a heat-insulation and heat-preservation layer (2) is arranged on the outer wall of the smooth inner layer (1), a pressure-resistant layer (3) is arranged on the outer wall of the heat-insulation and heat-preservation layer (2), and a protective outer layer (4) is arranged on the outer wall of the pressure-resistant layer (3);
the heat insulation layer (2) is of a multilayer structure and sequentially comprises an inner wall (5), an annular wavy structure (6) and an outer wall (7) from inside to outside; and the annular wave structure (6) is filled with heat insulation materials.
2. The non-metallic composite pipe according to claim 1, wherein the smooth inner layer (1) is made of thermoplastic engineering plastic.
3. The non-metallic composite pipe according to claim 1, characterized in that a cavity-clamping structure is formed between the inner wall (5) and the outer wall (7), the cavity-clamping structure being supported by the annular wave structure (6); the section of the annular wave structure (6) is in an annular wave shape, and the clamping cavity is divided into alternate hollow cavities; and the hollow cavity is filled with heat insulation materials.
4. The non-metallic composite pipe according to claim 3, wherein any side of the annular wavy structure (6) forms a bending angle α with a tangential direction to an inner vertex, and the bottom forms a bending angle β complementary to α; the thickness of the annular wavy structure (6) is a, and the height of a single side is h; wherein the bending angle α is 45 °, the bending angle β is 45 °, a is 7mm, and h is 20 mm.
5. The non-metallic composite pipe according to claim 3, wherein the inner wall (5), the annular wave structure (6) and the outer wall (7) of the heat insulation layer (2) are all made of rigid polyurethane foam.
6. The non-metallic composite pipe of claim 3, wherein the thermal insulation material is a basalt fiber-thermoplastic polyurethane-SiO 2 aerogel composite material, wherein the ratio of basalt fiber, thermoplastic polyurethane and SiO2 aerogel is 1:1: 18.
7. The non-metal composite pipe according to claim 1, wherein the material of the pressure-resistant layer (3) is a fiber reinforced resin-based composite material, and the fiber reinforcement comprises one or more of carbon fiber, glass fiber, quartz fiber, aramid fiber, ultra-high molecular weight polyethylene fiber and polyimide fiber; the resin comprises one or more of epoxy resin, polyimide resin, bismaleimide resin, cyanate ester and unsaturated polyester resin.
8. The non-metallic composite pipe according to claim 1, wherein the material of the protective outer layer (4) is a thermoplastic engineering plastic.
9. The non-metallic composite pipe according to claim 1, wherein adjacent two of the smooth inner layer (1), the heat insulation layer (2), the pressure-resistant layer (3) and the protective outer layer (4) are fixedly connected through an adhesive.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011217275.2A CN114440014B (en) | 2020-11-04 | 2020-11-04 | Thermal-insulated heat preservation nonmetallic composite pipe |
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| CN202011217275.2A CN114440014B (en) | 2020-11-04 | 2020-11-04 | Thermal-insulated heat preservation nonmetallic composite pipe |
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