CN113954452A - SiO (silicon dioxide)2Aerogel felt composite material, pipeline using same and laying method of pipeline - Google Patents

SiO (silicon dioxide)2Aerogel felt composite material, pipeline using same and laying method of pipeline Download PDF

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Publication number
CN113954452A
CN113954452A CN202111389312.2A CN202111389312A CN113954452A CN 113954452 A CN113954452 A CN 113954452A CN 202111389312 A CN202111389312 A CN 202111389312A CN 113954452 A CN113954452 A CN 113954452A
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China
Prior art keywords
metal
insulation layer
pipeline
sio
aerogel felt
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CN202111389312.2A
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Chinese (zh)
Inventor
张金权
龙斌
杨文�
阮章顺
陶柳
秦博
付晓刚
马浩然
崔国生
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China Institute of Atomic of Energy
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China Institute of Atomic of Energy
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Priority to CN202111389312.2A priority Critical patent/CN113954452A/en
Publication of CN113954452A publication Critical patent/CN113954452A/en
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a general shape other than plane
    • B32B1/08—Tubular products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/046—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/18—Layered products comprising a layer of metal comprising iron or steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B32B3/08—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • 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
    • F16L53/00—Heating of pipes or pipe systems; Cooling of pipes or pipe systems
    • F16L53/30—Heating of pipes or pipe systems
    • F16L53/35—Ohmic-resistance heating
    • F16L53/38—Ohmic-resistance heating using elongate electric heating elements, e.g. wires or ribbons
    • 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
    • F16L59/026—Mattresses, mats, blankets or the like
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17D—PIPE-LINE SYSTEMS; PIPE-LINES
    • F17D5/00—Protection or supervision of installations
    • F17D5/02—Preventing, monitoring, or locating loss
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/04—Inorganic
    • B32B2266/057—Silicon-containing material, e.g. glass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/12—Gel
    • B32B2266/126—Aerogel, i.e. a supercritically dried gel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/304—Insulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2597/00—Tubular articles, e.g. hoses, pipes

Abstract

The invention relates to SiO2Aerogel blanket composite material, pipeline using same, pipeline laying method, and SiO2The aerogel felt composite material comprises an aerogel felt body, a first metal isolation layer,The aerogel felt comprises a first metal insulation layer and a second metal insulation layer, wherein the first metal insulation layer covers the first main surface of the aerogel felt body, the second metal insulation layer covers the second main surface of the aerogel felt body, and the third metal insulation layer covers the end face of the aerogel felt body; the first metal isolation layer, the second metal isolation layer and the third metal isolation layer are selected from metal materials which are resistant to high temperature and liquid alkali metal corrosion. SiO of the invention2The aerogel felt composite material is particularly suitable for pipelines and equipment for conveying liquid alkali metal, and can effectively avoid the hazards of ignition of the aerogel felt, short-term release of a large amount of heat, release of toxic substances and the like caused by leakage of the alkali metal.

Description

SiO (silicon dioxide)2Aerogel felt composite material, pipeline using same and laying method of pipeline
Technical Field
The invention relates to the technical field of novel alkali metal heat-insulating flame-retardant materials, in particular to SiO2Aerogel blanket composites, pipes using the same, and methods of laying pipes.
Background
The nanometer aerogel heat preservation felt is a porous light solid material with gaseous media filled in nanometer holes, has the characteristics of low density, high porosity, high specific surface area, low refractive index, low dielectric constant and the like, shows excellent performances of heat insulation, sound insulation, adsorption and the like, and has the advantages of high temperature resistance, convenience in installation and the like, so that the nanometer aerogel heat preservation felt has a wide application prospect in the fields of heat preservation, energy conservation, chemical metallurgy, environmental management and the like. At present, the most mature silicon dioxide nanometer aerogel felt is generally used in the market and is prepared by drying methods such as carbon dioxide supercritical drying, normal-temperature drying or low-temperature drying and the like. However, the silica nano aerogel felt is easy to react violently when being in direct contact with high-temperature alkali metal, releases a large amount of heat in a short time, and generates toxic and harmful substances when the local temperature rises to 800-1000 ℃, thereby causing potential fire hazard and aggravating the hazard of alkali metal leakage. And the silica nanometer aerogel felt can slowly absorb leaked high-temperature alkali metal, so that the alkali metal leakage condition is difficult to monitor in the first time, and the nanometer aerogel heat-insulating felt is directly used for heat insulation of an alkali metal medium device, so that the great risk exists.
Disclosure of Invention
The invention aims to provide SiO2Aerogel blanket composite, pipeline using the same and method of laying pipeline, the SiO2The aerogel felt composite material is particularly suitable for pipelines for conveying liquid alkali metal, can effectively avoid the hazards of ignition, toxic substance release and the like of the aerogel felt caused by leakage of the alkali metal, has sensitive inspection performance on leakage of the liquid alkali metal by the pipeline laid by the pipeline laying method, is favorable for gathering and flowing the leaked liquid metal to slide to the bottom of the pipeline, and can realize timely detection on the leakage condition of the liquid alkali metal.
In order to achieve the above object, the first aspect of the present invention provides a SiO2Aerogel blanket composites, said SiO2The aerogel felt composite material comprises an aerogel felt body, a first metal insulation layer, a second metal insulation layer and a third metal insulation layer, wherein the first metal insulation layer covers the first main surface of the aerogel felt body, the second metal insulation layer covers the second main surface of the aerogel felt body, and the third metal insulation layer covers the end face of the aerogel felt body;
the first metal isolation layer, the second metal isolation layer and the third metal isolation layer are selected from metal materials which can resist the high temperature of more than 600 ℃ and resist the corrosion of liquid alkali metal, and the thicknesses of the first metal isolation layer, the second metal isolation layer and the third metal isolation layer are respectively and independently 0.01-0.2 mm.
Optionally, the first, second, and third metallic insulating layers are each independently 0.015-0.02mm thick.
Optionally, the materials of the first, second and third metallic barrier layers are each independently selected from stainless steel foil.
Optionally, the aerogel blanket body has a thickness of 5-10mm, and the aerogel blanket body contains nanopores with an average pore size of 10-150 nm.
In a second aspect, the present invention provides a pipe for transporting liquid alkali metal, the pipe comprising a pipe body, a thermal insulation layer covering an outer surface of the pipe body, the thermal insulation layer comprising the SiO of the first aspect of the present invention, and a liquid metal leak detector2The gas gel felt composite material, the liquid metal leakage detector set up in the pipeline body with between the insulating layer.
Optionally, the heat insulation layer is spirally laid on the outer surface of the pipeline body, and the number of the heat insulation layers is 1-4.
Optionally, an electric heating wire spirally wound along the circumferential direction of the pipeline body is arranged between the pipeline body and the heat insulation layer.
Optionally, the pipe further comprises a thermocouple disposed between the pipe body and the insulating layer, and a liquid metal leak detector.
Optionally, a reinforcing fixing steel wire for fixing the heat insulation layer is wound on the outer side surface of the heat insulation layer; the reinforcing fixing wires are arranged on the outer surface of the heat insulation layer at intervals; the material of the reinforcing and fixing wire is selected from stainless steel, copper or iron.
A third aspect of the invention provides a method of laying a pipeline as provided in the second aspect of the invention, the method comprising: and horizontally arranging the pipeline along the axial direction, and enabling the liquid metal leakage detector to be positioned right below the axis of the pipeline.
By the technical scheme, the SiO provided by the invention2The aerogel felt composite material is particularly suitable for serving as a heat insulation material of an alkali metal medium device, can effectively isolate the risk of direct contact reaction between alkali metal leaked in the device and the aerogel felt, and improves the success rate of leakage detection, thereby effectively isolating the risk of direct contact reaction between the alkali metal leaked in the device and the aerogel feltThe safety of the device is improved. SiO of the invention2The aerogel felt composite material is used for pipelines and the like for conveying liquid alkali metal, can effectively avoid subsequent additional danger caused by leakage of pipelines and equipment, and reduces the influence of the environment on the leakage monitoring accuracy.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is SiO of the present invention2A schematic structural view of one embodiment of an aerogel blanket composite;
FIG. 2 is a schematic diagram of one embodiment of a pipe for transporting liquid alkali metal according to the present invention.
Description of the reference numerals
1. A first metal isolation layer 2, a second metal isolation layer 3, an aerogel felt body
4. Side end face 5 of the third metal isolation layer, upper end face 6 of the third metal isolation layer, and thermocouple
7. Pipeline body 8, electric heating wire 9, insulating layer
10. Reinforced fixing wire 11 and liquid metal leakage detector
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In a first aspect, the present invention provides a SiO2Aerogel blanket composites, said SiO2The aerogel felt composite material comprises an aerogel felt body 3, a first metal isolation layer 1, a second metal isolation layer 2 and a third metal isolation layer, wherein the first metal isolation layer 1 covers the aerogel felt bodyThe aerogel felt body 3 is provided with a first main surface, the second metal insulation layer 2 covers the second main surface of the aerogel felt body 3, and the third metal insulation layer covers the end face of the aerogel felt body 3; the first metal isolation layer 1, the second metal isolation layer 2 and the third metal isolation layer are made of metal materials which can resist the high temperature of more than 600 ℃ and resist the corrosion of liquid alkali metal, and the thicknesses of the first metal isolation layer, the second metal isolation layer and the third metal isolation layer are respectively and independently 0.01-0.2 mm.
According to the invention, the end faces of the aerogel body comprise the side end faces 4 of the third metallic barrier in the length direction of the aerogel body and the upper end faces 5 and lower end faces of the third metallic barrier in the width direction. SiO of the invention2The surface and the end face of the aerogel felt composite material are completely coated by the metal isolation layer, the material is particularly suitable for being used as a heat insulation material of an alkali metal medium device, the direct contact path between alkali metal in the device and the aerogel felt after leakage can be effectively isolated, the risk of direct reaction between the alkali metal and the aerogel felt is greatly reduced, the functional requirements that the accident consequence is not aggravated after the alkali metal medium is leaked are met, and the safety of the device is effectively improved.
In one embodiment of the present invention, the thickness of the first metal barrier layer 1, the second metal barrier layer 2 and the third metal barrier layer may vary within a wide range, and preferably may each independently be 0.015 to 0.1mm, more preferably 0.015 to 0.02 mm. When the thickness of the metal isolation layer is within the range, the material can be effectively reduced while the heat preservation and the safety of the material are ensured.
In an embodiment of the present invention, the metal materials of the first metal isolation layer 1, the second metal isolation layer 2 and the third metal isolation layer may be any materials that are resistant to corrosion of liquid alkali metal and resistant to high temperature, and in order to further improve flexibility of the materials, the materials of the first metal isolation layer 1, the second metal isolation layer 2 and the third metal isolation layer may be stainless steel with excellent extensibility, and more preferably stainless steel foil, so that the materials can better adhere to devices with different surface shapes and large curvature, and further improve the performance of leakage prevention and protection.
In one embodiment of the present invention, the thickness of the aerogel blanket body 3 can vary within a wide range, for example, 3 to 20mm, preferably 5 to 10mm, the aerogel blanket body 3 contains nanopores having an average pore diameter of 10 to 150nm, and the SiO has a pore diameter of 3 to 20mm2The aerogel felt composite material has better heat preservation performance.
According to the present invention, the connection manner of the aerogel felt body 3 and the first metal insulation layer 1, the second metal insulation layer 2 and the third metal insulation layer is not particularly limited, and for example, bonding, physical pressing, spot welding and the like can be adopted. In one embodiment, the first metal barrier layer 1 and the second metal barrier layer 2 are bonded to the aerogel blanket body 3 by chemical bonding, physical pressing, or a combination of chemical bonding and physical pressing. Preferably, the aerogel blanket body 3 is bonded to the first and second metallic insulation layers 1 and 2 with a chemical bonding agent. The kind of the adhesive is not particularly limited in the present invention, and may be one or more conventionally used by those skilled in the art, for example, acrylic pressure sensitive adhesive, silicone rubber and inorganic aluminosilicate adhesive. In another embodiment, the third metal isolation layer is connected with the end face of the aerogel felt body 3 by spot welding, so that the SiO content can be effectively improved2The strength of the aerogel felt composite material avoids the problem of edge curling.
In a second aspect, the present invention provides a pipe for transporting liquid alkali metal, the pipe comprising a pipe body 7, a thermal insulation layer covering an outer surface of the pipe body 7, the thermal insulation layer comprising the SiO of the first aspect of the present invention, and a liquid metal leak detector 112Aerogel felt composite material, the liquid metal leakage detector 11 is arranged between the pipeline body 7 and the heat insulation layer 9.
The pipeline comprises a heat insulation layer which comprises SiO2The aerogel felt composite material and the heat insulation layer can be provided withEffectively preserving the heat of the pipeline and isolating the leaked liquid alkali metal from SiO2The aerogel felt body direct contact way, greatly reduced alkali metal and the risk that aerogel felt body reaction caused, liquid metal leakage detector can survey the liquid alkali metal of revealing and send alarm information simultaneously, can be effectively to the pipeline whether take place to leak the problem and in time accurately detect, further improve the security of pipeline use.
In one embodiment of the invention, the liquid metal leak detector 11 is arranged horizontally in the axial direction of the pipe.
In a preferred embodiment of the invention, the thermal barrier layer is made of SiO2Aerogel blanket composites.
In a specific embodiment of the present invention, the thermal insulation layer is laid on the outer surface of the pipeline body 7 in a spiral manner, and preferably, an angle of the thermal insulation layer is adjusted when the thermal insulation layer is laid so that a side end surface of the thermal insulation layer completely fits with the side end surface, so as to further improve thermal insulation and avoid leakage of the liquid alkali metal.
In a specific embodiment of the present invention, the number of the thermal insulation layers is 1 to 4, so as to meet the requirements of the use temperature, the heat dissipation performance, and the like, and further improve the safety.
In a specific embodiment of the present invention, an electric heating wire 8 spirally wound along the circumferential direction of the pipeline body 7 is disposed between the pipeline body 7 and the thermal insulation layer, so as to heat the pipeline.
In a particular embodiment of the invention, the pipe further comprises a thermocouple 6 to monitor the temperature of the pipe, the thermocouple 6 being arranged between the pipe body 7 and the insulation layer. The thermocouple 6 is conventionally employed by those skilled in the art and will not be described herein.
In a specific embodiment of the present invention, a reinforcing fixing wire for fixing the thermal insulation layer is wound along a circumferential direction of an outer surface of the thermal insulation layer, so that the thermal insulation layer is tightly attached to equipment such as a pipeline, and changes such as sliding and deformation are not generated. The material of the reinforcing and fixing wire is not limited in the present invention, and may be, for example, a stainless steel wire. Preferably, the reinforcing fixing wires are arranged at intervals.
According to the invention, the SiO of the invention2The aerogel felt composite material can be used for pipelines for conveying liquid alkali metal and other equipment with the risk of liquid alkali metal leakage.
A third aspect of the invention provides a method of laying a pipeline as provided in the second aspect of the invention, the method comprising: the pipe is arranged axially horizontally and the liquid metal leak detector 11 is located directly below the pipe axis.
The pipeline laid by the pipeline laying method is beneficial to gathering, flowing and sliding the leaked liquid alkali metal to the bottom of the pipeline axis when the pipeline leaks, and detecting the liquid alkali metal by the liquid metal leakage detector in time, thereby being beneficial to realizing the timely and accurate monitoring of the pipeline leakage condition.
The invention is further illustrated by the following examples, but is not to be construed as being limited thereto.
Example 1
As shown in FIG. 1, this embodiment is a SiO2Aerogel blanket composites, the SiO2Aerogel felt combined material includes aerogel felt body 3, first metal insulating layer 1, second metal insulating layer 2 and third metal insulating layer, first metal insulating layer 1 covers in the first main surface of aerogel felt body 3, second metal insulating layer 2 covers in the second main surface of aerogel felt body 3, the third metal insulating layer covers in the terminal surface of aerogel felt body 3, the third metal insulating layer includes the side end face 4 of third metal insulating layer, the up end 5 and the lower terminal surface of third metal insulating layer.
Wherein, the material of first metal isolation layer, first metal isolation layer and third metal isolation layer is stainless steel foil, and the thickness of first metal isolation layer 1 is 0.02mm, and the thickness of second metal isolation layer 2 is 0.02mm, and the thickness of third metal isolation layer is 0.015mm, and the thickness of aerogel felt body is 10mm, and aerogel felt body has the nanopore that the average pore diameter is 100 nm.
Comparative example 1
The comparative example is SiO2Aerogel blanket composites, the SiO2Aerogel blanket composites with the SiO of example 12Aerogel blanket composite materials are similar, except that the first, second and third metal insulation layers are all aluminum foil.
Comparative example 2
The comparative example is SiO2Aerogel blanket composites, the SiO2Aerogel blanket composites with the SiO of example 12Aerogel blanket composites are similar except that there is no third metal insulation layer.
Example 2
As shown in fig. 2, the present embodiment is a pipe for transporting liquid metal, which includes a pipe body 7, an electric heating wire 8, a heat insulating layer 9, a reinforcing fixing wire 10, a liquid metal leakage detector 11, and a thermocouple 6. Wherein, insulating layer 9 covers in the surface of pipeline body 7, and electric heating wire 8 is along the circumference spiral winding of pipeline body 7, and thermocouple 6 and liquid metal detector 12 all set up between pipeline body 7 and insulating layer 9, and the fixed silk 10 of strengthening of stainless steel material is around establishing along the circumference of insulating layer 9 surface, and a plurality of fixed silk intervals of strengthening set up. The thermal insulation layer 9 is 1 layer, and the material of the thermal insulation layer 9 is SiO prepared in the embodiment 12Aerogel blanket composites.
Comparative example 3
This comparative example provides a pipe for transporting liquid metal, which is similar to the pipe of example 1, except that the material of the thermal insulation layer 9 of the pipe is SiO prepared in comparative example 12Aerogel blanket composites.
Comparative example 4
This comparative example provides a pipe for transporting liquid metal which is similar to the pipe of example 1, except that the material of the thermal insulation layer 9 of the pipe is SiO prepared in comparative example 22Aerogel blanket composites.
Test example 1
The pipes of example 2, comparative example 3 and comparative example 4 were tested for safety when used for transporting liquid alkali metals. The specific test method comprises the following steps: a section of stainless steel pipeline with the outer diameter of 51mm and the length of 1m and two sealed ends is filled with a proper amount of alkali metal sodium, a hole with the diameter of 1mm is formed in the middle of the pipeline, and leakage of the pipeline is simulated. When the pipe is in use, it is positioned horizontally with the 1mm bore up and the liquid metal leak detector 11 positioned directly below the pipe axis. Starting a heating wire for heating, raising the temperature to 535 ℃ and preserving the temperature.
Tests show that the liquid metal leakage detector of the pipeline in the embodiment 2 gives a leakage alarm in a short time after the alkali metal leaks, and the temperature of the insulating layer outside the pipeline does not rise obviously, which shows that the pipeline in the embodiment 2 has excellent safety and successfully prevents the direct reaction of the alkali metal sodium and the aerogel felt body; the sodium vapor leaking above the pipe is collected into liquid drops, flows down along the outer wall of the pipe, and is detected by the liquid metal leakage detector 11 in time. After the temperature of the pipeline in the comparative example 3 is raised to 535 ℃, the aluminum foil of the aerogel thermal insulation blanket insulation layer tightly attached to the pipeline is obviously deformed at high temperature, even damage of individual positions is caused, the aluminum foils at the end surfaces and the joint positions are all cracked, and the aerogel blanket body in the pipeline cannot be continuously and comprehensively protected; after the alkali metal leaks, the alkali metal is directly contacted with the aerogel felt body and reacts, the local temperature is obviously increased, and the surrounding aluminum foil is further melted. In the pipeline of the comparative example 4, after the alkali metal leaks, the alkali metal reacts with the aerogel heat insulation body obviously, the temperature of the heat insulation layer outside the pipeline rises abnormally, the leaked alkali metal sodium cannot be detected after the liquid metal leakage detector 11 is used for a long time, and the safety of the pipeline is poor.
Test example 2
The safety of the pipe of example 2 when used for conveying liquid alkali metal was tested, except that the liquid metal leak detector 11 in the pipe was spirally wound around the outer wall of the pipe, and when the pipe was used, the pipe was placed horizontally with the hole of phi 1mm facing upwards.
It can be known through detection that after the alkali metal leaks from the pipeline in the embodiment 2, the liquid metal leakage detector needs to send out a leakage alarm for a long time, and the pipeline leakage cannot be monitored in time.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.

Claims (10)

1. SiO (silicon dioxide)2Aerogel blanket composite characterized by the SiO2The aerogel felt composite material comprises an aerogel felt body (3), a first metal insulation layer (1), a second metal insulation layer (2) and a third metal insulation layer, wherein the first metal insulation layer (1) covers the first main surface of the aerogel felt body (3), the second metal insulation layer (2) covers the second main surface of the aerogel felt body (3), and the third metal insulation layer covers the end face of the aerogel felt body (3);
the first metal isolation layer (1), the second metal isolation layer (2) and the third metal isolation layer are made of metal materials which can resist the high temperature of more than 600 ℃ and resist the corrosion of liquid alkali metal, and the thicknesses of the first metal isolation layer, the second metal isolation layer and the third metal isolation layer are 0.01-0.2mm respectively and independently.
2. SiO as claimed in claim 12Aerogel blanket composite, wherein the first metallic barrier layer (1), the second metallic barrier layer (2) and the third metallic barrier layer each independently have a thickness of 0.015-0.02 mm.
3. SiO as claimed in claim 12Aerogel blanket composite, wherein the metal material of the first metal barrier layer (1), the second metal barrier layer (2) and the third metal barrier layer are each independently selected from stainless steel foils.
4. SiO as claimed in claim 12The aerogel felt composite material is characterized in that the thickness of the aerogel felt body (3) is 5-10mm, the aerogel felt body contains nanopores, and the average pore diameter of the nanopores is 10-150 nm.
5. A pipe for transporting liquid alkali metal, characterized in that it comprises a pipe body (7), a thermal insulation layer (9) and a liquid metal leak detector (11); the insulation layer (9) covers the outer surface of the pipe body (7), the insulation layer (9) comprising the SiO of any of claims 1 to 42Aerogel felt composite material, the liquid metal leakage detector (11) is arranged between the pipeline body (7) and the heat insulation layer (9).
6. The pipeline according to claim 1, wherein the thermal insulation layer (9) is spirally laid on the outer surface of the pipeline body (7), and the thermal insulation layer (9) is 1-4 layers.
7. The duct according to claim 1, wherein an electric heating wire (8) helically wound in the circumferential direction of the duct body (7) is provided between the duct body (7) and the insulation layer (9).
8. The pipe according to claim 1, wherein the pipe further comprises a thermocouple (6), the thermocouple (6) being arranged between the pipe body (7) and the insulation layer (9).
9. The duct according to claim 1, wherein a reinforcing fixing wire (10) for fixing the insulation layer (9) is wound along the circumference of the outer surface of the insulation layer (9);
the reinforcing fixing wires (10) are arranged on the outer surface of the heat insulation layer (9) at intervals; the material of the reinforcing and fixing wire (10) is selected from stainless steel, copper or iron.
10. A method of laying a pipeline as claimed in any one of claims 5 to 9, the method comprising: the pipe is arranged horizontally in the axial direction, and the liquid metal leakage detector (11) is positioned right below the axis of the pipe.
CN202111389312.2A 2021-11-22 2021-11-22 SiO (silicon dioxide)2Aerogel felt composite material, pipeline using same and laying method of pipeline Pending CN113954452A (en)

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CN202111389312.2A CN113954452A (en) 2021-11-22 2021-11-22 SiO (silicon dioxide)2Aerogel felt composite material, pipeline using same and laying method of pipeline

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CN113954452A true CN113954452A (en) 2022-01-21

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