CN111911716A - Cryogenic working condition prefabricated cold insulation pipe - Google Patents
Cryogenic working condition prefabricated cold insulation pipe Download PDFInfo
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- CN111911716A CN111911716A CN202010813942.7A CN202010813942A CN111911716A CN 111911716 A CN111911716 A CN 111911716A CN 202010813942 A CN202010813942 A CN 202010813942A CN 111911716 A CN111911716 A CN 111911716A
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
- B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/22—Expanded, porous or hollow particles
- C08K7/24—Expanded, porous or hollow particles inorganic
- C08K7/26—Silicon- containing compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/02—Ingredients treated with inorganic substances
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/08—Ingredients agglomerated by treatment with a binding agent
-
- 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
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
- F16L59/029—Shape or form of insulating materials, with or without coverings integral with the insulating materials layered
-
- 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
- F16L59/10—Bandages or covers for the protection of the insulation, e.g. against the influence of the environment or against mechanical damage
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/18—Applications used for pipes
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- 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
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Thermal Insulation (AREA)
Abstract
The invention provides a cryogenic working condition prefabricated cold insulation pipe which sequentially comprises a steel pipe, a PIR pipe shell, a glass fiber layer, a PU foaming layer and an outer protecting pipe from inside to outside; the PIR tube shell is a modified PIR tube shell. Meanwhile, a production process of the prefabricated cold-insulating pipe under the deep cooling working condition is also provided. The invention provides a completely seamless prefabricated cold insulation system, which effectively overcomes the defects of long installation period and complex process in the prior art, and improves the installation efficiency by more than 60 percent; modified polyisocyanurate is adopted as a main material of a PIR (passive infrared) tube shell, and silica aerogel, filling powder and modification liquid are added, so that the formed PIR tube shell has more excellent bonding strength, pressure-resistant, shock-resistant, waterproof and moisture-proof performances, and also has more excellent ultralow-temperature thermal conductivity, and the medium conduction consumption is obviously reduced; the outer sheath is integrally formed by metal, so that the fireproof and weather-resistant performance is excellent, and the service life is longer than 20 years; saving material cost, increasing the utilization rate of raw materials and reducing the pressure of environmental protection.
Description
Technical Field
The invention belongs to the technical field of low-temperature deep cooling, and particularly relates to a prefabricated cold insulation pipe under a deep cooling working condition.
Background
With the vigorous development of the LNG market at home and abroad, the investment construction of large LNG receiving stations is accelerated. The LNG cryogenic pipeline cold insulation system always adopts the traditional method, consumes time and labor, and has economical efficiency and timeliness which cannot keep pace with the construction and development. The conventional cold insulation system has the following problems:
1. the traditional cold insulation system has thousands of splicing seams, and the hard cold insulation material is easy to separate from dislocation and the like because the pipeline and the environment temperature difference generate contraction expansion cracking, so that a through seam is formed, and the external condensation of the pipeline is frozen and the cold energy loss is caused. 2. The traditional cold insulation system sealing material (cold insulation daub) is ineffective due to the aged or improper construction, so that water enters the system or water and gas permeate occurs, and further cold energy loss is caused. 3. Due to the fact that a cold insulation system with unqualified standards is used in part of receiving stations, material attenuation fails, condensation, icing and cold energy loss are caused. 4. And the LNG receiving station comprises vibration pipelines such as equipment outlets. The joint of the hard/semi-hard cold-insulating material cracks due to the vibration of the pipeline, and the continuous sealing performance of the system cannot be ensured, so that cold leakage and icing are realized. 5. The repair of the vertical pipeline outside the storage tank is difficult. The whole height of the storage tank reaches 50 meters, once the pipeline outside the tank is subjected to cold insulation failure, the online repair difficulty and potential safety hazard are large, and the maintenance cost is very high. 6. And (5) overhauling partial equipment and pipe fittings. The PIR waste which is overhauled and dismantled has long explanation period, so that the environmental protection problem is caused, and the treatment is difficult; the online maintenance of the PIR system is difficult, and the cold insulation effect is poor after the maintenance.
Therefore, the cold insulation pipe which is convenient to install, saves materials, shortens the construction period and reduces the manufacturing cost is a difficult problem which needs to be solved urgently by technical personnel in the field.
Disclosure of Invention
In order to solve the problems, the invention discloses a cryogenic working condition prefabricated cold insulation pipe.
In order to achieve the purpose, the invention provides the following technical scheme:
a cryogenic working condition prefabricated cold insulation pipe comprises a steel pipe, a PIR pipe shell, a glass fiber layer, a PU foaming layer and an outer protecting pipe from inside to outside in sequence; the PIR tube shell is a modified PIR tube shell. Further, the production process is as follows:
(1) pretreating the surface of the steel pipe to remove burrs, dust and oil stains;
(2) cutting the PIR pipe shell according to the size of the steel pipe, installing and wrapping the cut and formed PIR pipe shell on the surface of the steel pipe, and binding the cut and formed PIR pipe shell by using a glass fiber adhesive tape to form a glass fiber layer;
(3) fixing an outer protecting pipe on a pipe penetrating foaming platform to form a concentric circle with the steel pipe wrapped by the PIR pipe shell in the step (2), and fixedly sealing two ends of the outer protecting pipe on the steel pipe by using discs to form a closed space structure in the inner space; starting a foaming machine, and injecting a PU mixture into the interlayer between the outer protective pipe and the steel pipe from a foaming hole reserved in the center of the pipe section to form a PU foaming layer; closing and reserving the foaming holes after the material injection is finished;
(4) and (5) warehousing and storing the finished product after the finished product is inspected.
Further, the PIR tube shell comprises the following components in percentage by mass: polyisocyanurate (d): 50-62%, and silica aerogel: 10-20% of filling powder: 10-15% and a modifying solution: 8-15%; the modified liquid comprises diluent, polyvinyl alcohol, polytetrafluoroethylene and aluminum phosphate liquid.
Further, the preparation method of the PIR tube shell in the step (1) is as follows:
(a) taking silicon dioxide aerogel, putting the silicon dioxide aerogel into the modification liquid, heating and stirring uniformly, and then preserving heat for later use;
(b) and (b) taking the polyisocyanurate, heating to completely melt the polyisocyanurate, sequentially adding the filling powder and the modified liquid in which the silica aerogel is dissolved in the step (a), uniformly stirring, and then casting and molding to obtain the PIR tube shell.
Further, the percentage of each component in the modification liquid in the total mass of the modification liquid is respectively as follows: diluent agent: 25-33%, polyvinyl alcohol: 20-30% of polytetrafluoroethylene: 18-25% and aluminum phosphate liquid: 18 to 25 percent.
Further, the glass fiber adhesive tapes in the step (2) are bound according to three paths of one meter, and after the binding is finished, a layer of glass fiber cloth needs to be wound on the surface of the PIR pipe shell; the glass fiber cloth and the glass fiber adhesive tape together form a glass fiber layer.
Further, the longitudinal circular seam of the PIR tube shell needs to be staggered and at least reaches 5 cm.
Further, the foam density of the PU foaming layer is 60 +/-5 KG/m through heavy cultivation.
Further, the outer pillar is the outer pillar of spiral.
Compared with the prior art, the invention has the following beneficial effects:
1. the completely seamless prefabricated cold insulation system is provided, the defects of long installation period and complex process existing at present are effectively overcome, and the installation efficiency is improved by over 60%;
2. modified polyisocyanurate is adopted as a main material of a PIR (passive infrared) tube shell, and silica aerogel, filling powder and modification liquid are added, so that the formed PIR tube shell has more excellent bonding strength, pressure-resistant, shock-resistant, waterproof and moisture-proof performances, and also has more excellent ultralow-temperature thermal conductivity, and the medium conduction consumption is obviously reduced;
3. the outer sheath is integrally formed by metal, so that the fireproof and weather-resistant performance is excellent, and the service life is longer than 20 years;
4. saving material cost, increasing the utilization rate of raw materials and reducing the pressure of environmental protection.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
List of reference numerals: the pipe comprises a steel pipe 1, a PIR pipe shell 2, a glass fiber layer 3, a PU foaming layer 4 and an outer protecting pipe 5.
Detailed Description
The technical solutions provided by the present invention will be described in detail below with reference to specific examples, and it should be understood that the following specific embodiments are only illustrative of the present invention and are not intended to limit the scope of the present invention.
As shown in fig. 1, the structural schematic diagram of the invention is a cryogenic working condition prefabricated cold insulation pipe, and the cold insulation pipe sequentially comprises a steel pipe 1, a PIR pipe shell 2, a glass fiber layer 3, a PU foam layer 4 and an outer protecting pipe 5 from inside to outside. The production process of the cold insulation pipe comprises the following steps:
(1) pretreating the surface of the steel pipe 1 to remove burrs, dust and oil stains;
(2) cutting the PIR tube shell 2 according to the size of the steel tube 1, installing and wrapping the cut and formed PIR tube shell 2 on the surface of the steel tube 1, binding the cut and formed PIR tube shell 2 by using a glass fiber adhesive tape according to three lines of one meter, and winding a layer of glass fiber cloth on the surface of the PIR tube shell 2 after binding is finished; the glass fiber cloth and the glass fiber adhesive tape together form a glass fiber layer 3; the longitudinal circular seam of the PIR tube shell needs to be staggered and at least reaches 5 cm;
(3) the outer protecting pipe 5 is selected to be a spiral outer protecting pipe, the outer protecting pipe 5 is fixed on the pipe penetrating foaming platform and forms a concentric circle with the steel pipe 1 wrapped by the PIR pipe shell 2 in the step (2), and two ends of the outer protecting pipe 5 are fixedly sealed on the steel pipe 1 through discs to enable the inner space to form a closed space structure; starting a foaming machine, injecting a PU mixture into the interlayer between the outer protective pipe 5 and the steel pipe 1 from a foaming hole reserved in the center of the pipe section to form a PU foaming layer 4, and carrying out thin-film casting on the PU foaming layer with the foam density of 60 +/-5 KG/m; closing and reserving the foaming holes after the material injection is finished;
(4) and (5) warehousing and storing the finished product after the finished product is inspected.
In the step (2), the PIR tube shell 2 is a modified PIR tube shell, and the composition and the mass percentage of each component of the PIR tube shell 2 are respectively as follows: polyisocyanurate (d): 50-62%, and silica aerogel: 10-20% of filling powder: 10-15% and a modifying solution: 8-15%; the modified liquid comprises the following components in percentage by mass: diluent agent: 25-33%, polyvinyl alcohol: 20-30% of polytetrafluoroethylene: 18-25% and aluminum phosphate liquid: 18 to 25 percent.
The preparation method of the PIR tube shell 2 is as follows:
(a) taking silicon dioxide aerogel, putting the silicon dioxide aerogel into the modification liquid, heating and stirring uniformly, and then preserving heat for later use;
(b) and (b) taking the polyisocyanurate, heating to completely melt the polyisocyanurate, sequentially adding the filling powder and the modified liquid in which the silica aerogel is dissolved in the step (a), uniformly stirring, and then casting and molding to obtain the PIR tube shell.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and those skilled in the art should understand that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all the modifications and equivalent substitutions should be covered by the claims of the present invention.
Claims (9)
1. A cryogenic working condition prefabricated cold insulation pipe is characterized in that: the cold insulation pipe comprises a steel pipe, a PIR pipe shell, a glass fiber layer, a PU foaming layer and an outer protecting pipe from inside to outside in sequence; the PIR tube shell is a modified PIR tube shell.
2. The cryogenic working condition prefabricated cold-insulating pipe according to claim 1, characterized in that: the production process comprises the following steps:
(1) pretreating the surface of the steel pipe to remove burrs, dust and oil stains;
(2) cutting the PIR pipe shell according to the size of the steel pipe, installing and wrapping the cut and formed PIR pipe shell on the surface of the steel pipe, and binding the cut and formed PIR pipe shell by using a glass fiber adhesive tape to form a glass fiber layer;
(3) fixing an outer protecting pipe on a pipe penetrating foaming platform to form a concentric circle with the steel pipe wrapped by the PIR pipe shell in the step (2), and fixedly sealing two ends of the outer protecting pipe on the steel pipe by using discs to form a closed space structure in the inner space; starting a foaming machine, and injecting a PU mixture into the interlayer between the outer protective pipe and the steel pipe from a foaming hole reserved in the center of the pipe section to form a PU foaming layer; closing and reserving the foaming holes after the material injection is finished;
(4) and (5) warehousing and storing the finished product after the finished product is inspected.
3. The cryogenic working condition prefabricated cold-insulating pipe according to claim 1, characterized in that: the PIR tube shell comprises the following components in percentage by mass: polyisocyanurate (d): 50-62%, and silica aerogel: 10-20% of filling powder: 10-15% and a modifying solution: 8-15%; the modified liquid comprises a diluent, polyvinyl alcohol, polytetrafluoroethylene and aluminum phosphate liquid.
4. The cryogenic working condition prefabricated cold-insulating pipe according to claim 3, characterized in that: the preparation method of the PIR tube shell in the step (1) is as follows:
(a) taking silicon dioxide aerogel, putting the silicon dioxide aerogel into the modification liquid, heating and stirring uniformly, and then preserving heat for later use;
(b) and (b) taking the polyisocyanurate, heating to completely melt the polyisocyanurate, sequentially adding the filling powder and the modified liquid in which the silica aerogel is dissolved in the step (a), uniformly stirring, and then casting and molding to obtain the PIR tube shell.
5. The cryogenic working condition prefabricated cold-insulating pipe according to claim 3, characterized in that: the percentage of each component in the modifying liquid in the total mass of the modifying liquid is respectively as follows: diluent agent: 25-33%, polyvinyl alcohol: 20-30% of polytetrafluoroethylene: 18-25% and aluminum phosphate liquid: 18 to 25 percent.
6. The cryogenic working condition prefabricated cold-insulating pipe according to claim 2, characterized in that: binding the glass fiber adhesive tapes in the step (2) according to three paths of one meter, and winding a layer of glass fiber cloth on the surface of the PIR tube shell after the binding is finished; the glass fiber cloth and the glass fiber adhesive tape jointly form a glass fiber layer.
7. The cryogenic working condition prefabricated cold-insulating pipe according to claim 6, characterized in that: the longitudinal circular seam of the PIR tube shell needs to be staggered and at least reaches 5 cm.
8. The cryogenic working condition prefabricated cold-insulating pipe according to claim 1, characterized in that: and carrying out high-speed dry-mass wet.
9. The cryogenic working condition prefabricated cold-insulating pipe according to claim 1, characterized in that: the outer protecting pipe is a spiral outer protecting pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010813942.7A CN111911716A (en) | 2020-08-13 | 2020-08-13 | Cryogenic working condition prefabricated cold insulation pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010813942.7A CN111911716A (en) | 2020-08-13 | 2020-08-13 | Cryogenic working condition prefabricated cold insulation pipe |
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| CN111911716A true CN111911716A (en) | 2020-11-10 |
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| CN202010813942.7A Pending CN111911716A (en) | 2020-08-13 | 2020-08-13 | Cryogenic working condition prefabricated cold insulation pipe |
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Application publication date: 20201110 |