High-temperature heat distribution pipeline heat preservation structure and high-temperature heat distribution pipe

Abstract

The invention discloses a high-temperature heat distribution pipeline heat preservation structure, and relates to the technical field of high-temperature heat insulation. The heat preservation structure comprises a plurality of heat insulation supporting strips made of heat insulation materials, the heat insulation supporting strips are evenly distributed around the periphery of a preset circle, and the heat insulation supporting strips extend in the axial direction of the preset circle. The circumference defined by the outer sides of the heat insulation supporting strips is covered with a first reflecting layer, and the first reflecting layer is sequentially covered with a second heat preservation layer, a second reflecting layer, a third heat preservation layer and a waterproof layer. The two ends of each heat insulation supporting strip are each provided with a closed ring, each closed ring can seal a cavity defined by the corresponding two adjacent heat insulation supporting strips, the corresponding first reflecting layer and the preset circle periphery, the heat preservation effect is high, the structural thickness is small, the heat preservation efficiency is high, the heat preservation efficiency cannot be reduced after long-term use, and the heat preservation effect is good. And the requirements of heat efficiency and reliability of a medium conveying pipeline are met. The thermal pipe is covered with the thermal insulation structure.

Description

Technical Field

[0001] The present invention relates to the technical field of high-temperature thermal insulation, and in particular to a high-temperature thermal pipeline insulation structure and a high-temperature thermal pipe. Background Art

[0002] High-temperature heat medium transmission pipelines are the main thermal equipment of long-distance heat transmission networks. Good thermal insulation is of great significance to improving the safety and reliability of equipment, reducing heat loss, and saving energy. At present, the materials suitable for thermal pipe insulation are mainly nano-aerogel products, aluminum silicate products, magnesium silicate products, glass fiber felt, etc. However, these materials have some disadvantages in the high temperature section (600℃~700℃). For example, although the maximum temperature of the 650℃ aerogel felt is 650℃, its long-term use temperature must be below 500℃; although the maximum temperature of the 1000℃ aerogel felt is high, its price is too expensive, which limits its promotion and use; although the use temperature of aluminum silicate wool reaches 1000℃, its thermal radiation shielding effect is poor and the thermal conductivity coefficient is also large in the high temperature section, thereby reducing the thermal insulation effect of the high temperature section. Therefore, there are generally problems such as large insulation structure thickness, large heat loss and low thermal efficiency in high-temperature thermal pipelines.

[0003] In addition, with the accelerated pace of industrial upgrading, the thermal efficiency and reliability requirements for heat medium transportation pipelines are becoming increasingly higher. The new development trend is that the heating pipelines must not need to be replaced for many years, and the insulation efficiency does not significantly decrease with age. For example, some industrial heat medium transportation systems require that the heating pipelines and their insulation systems must have a service life of more than ten years. In other words, the existing insulation structure cannot meet the thermal efficiency and reliability requirements of the medium transportation pipelines. Summary of the invention

[0004] In view of the technical problem that the existing insulation structure cannot meet the thermal efficiency and reliability requirements of the medium transportation pipeline; the present invention provides a high-temperature thermal pipeline insulation structure and a high-temperature thermal pipe, which have a high thermal insulation effect, a small structure thickness, and a high thermal insulation efficiency. The thermal insulation efficiency can be maintained without attenuation during long-term use, thereby meeting the thermal efficiency and reliability requirements of the medium transportation pipeline.

[0005] The present invention is achieved through the following technical solutions:

[0006] In a first aspect, the present invention provides a high-temperature thermal pipeline insulation structure, comprising a plurality of insulation support bars made of insulation material, wherein the plurality of insulation support bars are evenly distributed around the circumference of a preset circle, and the insulation support bars extend axially along the preset circle; the circumference surrounded by the outer sides of the plurality of insulation support bars is covered with a first reflection layer, and the first reflection layer is sequentially covered with a second insulation layer, a second reflection layer, a third insulation layer and a waterproof layer; closed rings are provided at both ends of the insulation support bars, and the closed rings can close the cavity surrounded by two adjacent insulation support bars, the first reflection layer and the circumference of the preset circle.

[0007] The high-temperature thermal pipeline insulation structure provided by the present invention comprises a plurality of thermal insulation support strips made of thermal insulation material, which are evenly distributed around the outer circumference of a preset circle and extend axially, and the circumference surrounded by the outer side is covered with a first reflecting layer, and the first reflecting layer is sequentially covered with a second thermal insulation layer, a second reflecting layer, a third thermal insulation layer and a waterproof layer, and closed rings are provided at both ends of the thermal insulation support strips, and the closed rings can close the cavity surrounded by two adjacent thermal insulation support strips, the first reflecting layer and the outer circumference of the preset circle, so that when the thermal insulation structure is working, it forms a plurality of cavities with the outer wall of the thermal pipeline, and the outer cavities are sequentially covered with the second thermal insulation layer, the second reflecting layer, the third thermal insulation layer and the waterproof layer, thereby greatly reducing the solid heat conduction and radiation heat dissipation in the high-temperature section of the outer periphery of the thermal pipeline through the cavity, and the air convection heat dissipation can be effectively reduced by setting a reasonable radial dimension thickness of the cavity.

[0008] In addition, the insulation support strip is made of insulation material, which reduces the heat conduction and heat dissipation of the solid support material in the cavity insulation layer, and has the dual functions of insulation and supporting the outer insulation layer, solving the problem of poor insulation effect of traditional aluminum silicate fiber felt in high temperature sections and material shrinkage and collapse after long-term use. The cavity insulation layer and the second insulation layer together effectively block the heat dissipation of the pipeline to the outside, greatly improving the insulation efficiency. A third insulation layer is arranged outside the second insulation layer, which has a good insulation effect.

[0009] In summary, the high-temperature thermal pipeline insulation structure provided by the present invention has a high insulation effect, a small structure thickness, and a high insulation efficiency. It can achieve long-term use without attenuation of the insulation efficiency and meet the thermal efficiency and reliability requirements of the medium transmission pipeline.

[0010] In an optional embodiment, the number of the thermal insulation support bars is 8 to 12, the tangential width of the thermal insulation support bars is 5 mm to 10 mm, and the height along the radial direction of the pipeline is 6 mm to 10 mm.

[0011] In an optional embodiment, the thermal insulation support strip is made of thermal insulation slurry, and the material components of the thermal insulation slurry are: 100-150 parts by weight of expanded vermiculite powder, 80-120 parts by weight of wollastonite, 100-200 parts by weight of sepiolite wool, 80-120 parts by weight of sodium bentonite, 50-100 parts by weight of expanded perlite, 150-250 parts by weight of sodium silicate, 500-1000 parts by weight of fly ash hollow floating beads, 100-200 parts by weight of potassium hexatitanate whiskers, 20-40 parts by weight of hydroxymethyl cellulose, 20-40 parts by weight of polyacrylamide, and an appropriate amount of clean water; wherein the particle size of the hollow fly ash floating beads is 80-120 mesh, and the particle size of the expanded vermiculite powder is 200 mesh to 500 mesh.

[0012] In an optional embodiment, the closed ring is formed by bonding aerogel strips along the circumferential direction.

[0013] In an optional implementation, the width of the closed ring is 20 mm to 30 mm; and the angle between the closed seam of the closed ring and the end face of the closed ring is ≤45°.

[0014] In an optional implementation, the first reflective layer is a stainless steel foil, and the surface roughness of the first reflective layer is ≤Ra0.4.

[0015] In an optional embodiment, the second thermal insulation layer is an aerogel layer, and the thickness of the second thermal insulation layer is 9 mm to 12 mm.

[0016] In an optional embodiment, the third thermal insulation layer is made of rock wool felt, and the thickness of the third thermal insulation layer is 50 mm to 70 mm.

[0017] In an optional embodiment, the waterproof layer is made of aluminum foil glass cloth.

[0018] In a second aspect, the present invention provides a high-temperature thermal pipe, comprising a pipe body, the above-mentioned high-temperature thermal pipe insulation structure is arranged outside the pipe body, and the thermal insulation support strip is installed outside the thermal pipe body.

[0019] The high-temperature thermal pipe provided by the present invention is provided with the above-mentioned high-temperature thermal pipe insulation structure outside the pipe body, has a high insulation effect, and has a small structure thickness and high insulation efficiency, and can achieve long-term use without attenuation of the insulation efficiency.

[0020] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0021] 1. The high-temperature thermal pipe insulation structure provided by the present invention comprises a plurality of thermal insulation support strips made of thermal insulation material, which are evenly distributed around the outer circumference of a preset circle and extend axially, and the circumference surrounded by the outer side is covered with a first reflecting layer, and the first reflecting layer is sequentially covered with a second thermal insulation layer, a second reflecting layer, a third thermal insulation layer and a waterproof layer, and closed rings are provided at both ends of the thermal insulation support strips, and the closed rings can close the cavity surrounded by two adjacent thermal insulation support strips, the first reflecting layer and the outer circumference of the preset circle, so that when the thermal insulation structure is working, it forms a plurality of cavities with the outer wall of the thermal pipe, and the outer cavities are sequentially covered with a second thermal insulation layer, a second reflecting layer, a third thermal insulation layer and a waterproof layer, thereby greatly reducing solid heat conduction and radiation heat dissipation in the high-temperature section of the outer periphery of the thermal pipe through the cavity, and effectively reducing air convection heat dissipation by setting a reasonable radial dimension thickness of the cavity.

[0022] 2. The high-temperature thermal pipeline insulation structure provided by the present invention has insulation support strips made of insulation materials, which reduces the heat conduction and heat dissipation of the solid support material in the cavity insulation layer, and has the dual functions of insulation and supporting the outer insulation layer, solving the problems of poor insulation effect of traditional aluminum silicate fiber felt in high-temperature sections and shrinkage and collapse of the material after long-term use.

[0023] 3. The high-temperature thermal pipeline insulation structure provided by the present invention, the cavity insulation layer and the second insulation layer together effectively block the heat dissipation of the pipeline to the outside, greatly improving the insulation efficiency, and a third insulation layer is arranged outside the second insulation layer, which has a good insulation effect.

[0024] 4. The high-temperature thermal pipe provided by the present invention is provided with the above-mentioned high-temperature thermal pipe insulation structure outside the pipe body, which has a high insulation effect, a small structure thickness, and a high insulation efficiency, and can achieve long-term use without attenuation of the insulation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0026] In the attached picture:

[0027] Figure 1 This is a schematic diagram of the cross-sectional structure of a high-temperature thermal pipe according to an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the end structure of a high-temperature thermal pipe according to an embodiment of the present invention;

[0029] Figure 3This is a schematic diagram of the connection structure of the heat insulation support and the closed loop according to an embodiment of the present invention;

[0030] Figure 4 Schematic diagram of the structure of the closed loop according to an embodiment of the present invention.

[0031] Marks and corresponding parts names in the attached drawings:

[0032] 1-thermal pipe body, 2-insulation support strip, 3-first reflection layer, 4-second thermal insulation layer, 5-second reflection layer, 6-third thermal insulation layer, 7-waterproof layer, 8-closed ring, 8a-closed joint. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0034] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0035] In the description of the embodiments of the present application, the indicated orientation or position relationship is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the product of the application is conventionally placed when in use, or is the orientation or position relationship conventionally understood by those skilled in the art. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0036] In the description of the present invention, unless otherwise clearly specified and limited, the terms "provided with", "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] Example 1

[0038] Combination Figure 1 and Figure 2The present embodiment provides a high-temperature thermal pipeline insulation structure, comprising a plurality of thermal insulation support bars 2 made of thermal insulation material, wherein the plurality of thermal insulation support bars 2 are evenly distributed around the periphery of a preset circle (thermal pipeline), and the thermal insulation support bars 2 extend axially along the preset circle; the circumference surrounded by the outer sides of the plurality of thermal insulation support bars 2 is covered with a first reflection layer 3, and the first reflection layer 3 is sequentially covered with a second insulation layer 4, a second reflection layer 5, a third insulation layer 6 and a waterproof layer 7; both ends of the thermal insulation support bar 2 are provided with a closed ring 8, and the closed ring 8 can close the cavity surrounded by two adjacent thermal insulation support bars 2, the first reflection layer 3 and the periphery of the preset circle.

[0039] Combination Figure 2 Specifically, the starting and ending ends of the heat-insulating support strip 2 are wrapped around the circumference with a closed ring 8, so that the heat-insulating support strip 2, the closed ring 8 and the first reflective layer 3 form a cavity heat-insulating layer. The length of the first reflective layer 3 along the preset circular axis must wrap the closed ring 8 and ensure that the air in the cavity heat-insulating layer is not connected to the outside world. Therefore, the radial height of the closed ring 8 is the same as the radial height of the heat-insulating support strip 2. In addition, by setting the cavity heat-insulating layer, the solid heat conduction, air convection heat transfer and radiation heat transfer in the high-temperature section can be effectively blocked, the heat preservation effect of the high-temperature section can be improved, and the use of the subsequent aerogel felt layer can be reduced, saving the cost of the heat-insulating structure.

[0040] Combination Figure 3 In this embodiment, the heat insulation support strip 2 has the dual functions of reducing solid heat conduction and supporting the outer insulation layer. It can be understood that the heat insulation support strip 2 is in the shape of a long strip, and its tangential width along the outer circle of the preset circle is 5mm to 10mm, and its radial height along the preset circle is 6mm to 10mm. During installation, it is bonded to the outer circumference of the pipeline with a high temperature resistant adhesive of 800℃, and evenly distributed into 8 to 12 groups. When the diameter of the pipeline is small, a smaller number of groups is selected, and when the diameter of the pipeline is large, a larger number of groups is selected.

[0041] In this embodiment, the heat-insulating support strip 2 is made of a heat-insulating slurry, and the heat-insulating slurry material components include: 100 to 150 parts by weight of expanded vermiculite powder, 80 to 120 parts by weight of wollastonite, 100 to 200 parts by weight of sepiolite wool, 80 to 120 parts by weight of sodium bentonite, 50 to 100 parts by weight of expanded perlite, 150 to 250 parts by weight of sodium silicate, 500 to 1000 parts by weight of fly ash hollow floating beads, and 100 to 20 parts by weight of silicate. 0 parts by weight of potassium hexatitanate whisker, 20 to 40 parts by weight of hydroxymethyl cellulose, and 20 to 40 parts by weight of polyacrylamide, add appropriate amount of clean water and stir and mix in a disperser to form a thermal insulation slurry; wherein the particle size of the hollow fly ash beads is 80 to 120 meshes, and the particle size of the expanded vermiculite powder is 200 mesh to 500 meshes; after the slurry is prepared according to the above components, the slurry is poured into a long strip metal mold for molding, and baked at a temperature of 200°C to 300°C for more than 8 hours to obtain a thermal insulation support strip 2.

[0042] The high-temperature thermal conductivity of the heat-insulating support strip 2 thus obtained is small, and its thermal conductivity at 700°C is ≤0.10W / m·K. The heat-insulating layer reduces the heat dissipation of solid heat conduction through the setting of the support strip, and solves the problem that the traditional aluminum silicate fiber felt has a large thermal conductivity in the high-temperature section and is easy to shrink and collapse due to its soft material; at the same time, the heat-insulating support strips 2 evenly distributed along the preset circle can divide the heat-insulating cavity outside the pipeline into multiple closed areas, further reducing the air convection heat dissipation in the outer circular area of ​​the pipeline.

[0043] Combination Figure 4 A closed ring 8 is provided at the starting and end of the length direction of the heat insulation support strip 2 (the length direction of the pipeline). The material type is aerogel felt strip of type IV in the GB / T34336 standard, and the maximum operating temperature is 1000°C; the width of the aerogel felt strip is 20mm-30mm; during installation, the aerogel felt strip is bonded to the outer circle of the pipeline with high temperature resistant glue to form a closed ring 8. After bonding into a circular ring, the cavity insulation layer cannot leak, and air convection heat transfer is formed. In this embodiment, the angle of the closed seam 8a of the closed ring 8 is ≤45°, and the seam is bonded into a whole ring with high temperature glue.

[0044] This embodiment uses 1000°C aerogel as the closed ring 8 because aerogel has good flexibility and can fit well with the outer arc of the pipeline to prevent leakage of the cavity insulation layer, thereby reducing the insulation effect.

[0045] The first reflective layer 3 is installed outside the heat-insulating support bar 2 and the closed ring 8. In this embodiment, the first reflective layer 3 is a 304 stainless steel foil; to ensure the heat radiation reflectivity, the roughness of both surfaces of the stainless steel foil is ≤ Ra0.4.

[0046] During installation, the first reflective layer 3 (stainless steel foil) is tightly fitted to the closed ring 8, and the seams of the stainless steel foil should overlap. Stainless steel wire is used to wrap the outer circle of the steel foil to make the outer circle fit tightly to ensure that the cavity insulation layer is not connected to the external air to cause convective heat transfer.

[0047] It should be understood that in the high-temperature section outside the thermal pipeline, the proportion of heat radiation heat dissipation accounts for more than 50% of the total heat dissipation. By arranging the stainless steel foil as the first reflective layer 3, the heat radiation heat dissipation in the high-temperature section can be blocked in time. At the same time, by utilizing the high-temperature oxidation resistance of stainless steel, the first reflective layer 3 can maintain high reflective performance for the heat radiation from the thermal pipeline for a long time, and the first reflective layer 3 can maintain a low radiation coefficient towards the outside air for a long time, that is, the radiation heat dissipation of the pipeline to the outside air is blocked.

[0048] As for the second thermal insulation layer 4, it covers the outside of the first reflective layer 3 and is an aerogel felt layer with a thickness of 9 mm to 12 mm. When the temperature of the pipeline is high, a larger value within the thickness range is selected. In this embodiment, the aerogel type is type III in the GB / T34336 standard, and the classified maximum operating temperature is 650°C. The aerogel felt layer tightly wraps the first reflective layer 3, and the joints should be aligned and tightly to ensure that no air gaps are left. The aerogel felt layer can be fixed by tying iron bars or wires.

[0049] It is known that the thermal conductivity of aerogel at room temperature is 0.012-0.023 W / m·K, and the thermal conductivity at a high temperature of 500°C is much lower than that of traditional insulation materials, about 0.045 W / m·K. The aerogel felt layer is used on the outside of the cavity insulation layer to timely block the heat conduction from the cavity insulation layer to the outside air, further improving the insulation effect of the thermal pipeline, and achieving thermal insulation with a temperature difference of more than 350°C. When the cavity insulation layer is used in combination with the aerogel felt layer, the heat conduction is minimized to achieve the best insulation combination.

[0050] The second reflective layer 5 is covered on the outside of the second thermal insulation layer 4 and is made of aluminum foil. Since aerogel has a strong permeability to thermal radiation, the second reflective layer 5 is provided to further shield the thermal radiation from the cavity thermal insulation layer through the aerogel felt layer; at this time, most of the thermal radiation from the pipeline to the air side has been shielded, which can minimize the heat loss caused by thermal radiation.

[0051] The third reflective layer, which covers the outside of the second reflective layer 5, is a rock wool felt with a thickness of 50 mm to 70 mm, and its maximum operating temperature is greater than 350° C. During installation, the joints should be aligned and tightly attached to ensure that no air gaps are left, and the third thermal insulation layer 6 can be fixed by tying iron bars or wires.

[0052] In addition, the third thermal insulation layer 6 is wrapped with an aluminum foil glass cloth waterproof layer 7, and the waterproof layer 7 is glued with glue to avoid air gaps at the joints.

[0053] Through experiments and theoretical verification, the high-temperature thermal pipeline insulation mechanism provided in this embodiment, its cavity insulation layer, the second insulation layer 4 and the third insulation layer 6 can all work at the optimal long-term working temperature (600℃~700℃), and the insulation efficiency decays little after long-term use, and the service life is more than 10 years; and the thickness is only half of the traditional insulation structure, and the insulation efficiency is improved by more than 20% compared with the traditional insulation structure; the insulation investment economy is moderate, and it is suitable for large-scale promotion and use.

[0054] Example 2

[0055] Combination Figure 1 and Figure 2 This embodiment provides a high-temperature thermal pipe, including a pipe body, the high-temperature thermal pipe insulation structure described in Example 1 is arranged outside the pipe body, and the insulation support strip 2 is installed outside the thermal pipe body 1.

[0056] It can be seen that the high-temperature thermal pipe provided in this embodiment is provided with the high-temperature thermal pipe insulation structure recorded in Example 1 outside the pipe body, which has a high insulation effect, a small structure thickness, and a high insulation efficiency, and can achieve long-term use without attenuation of the insulation efficiency.

[0057] At the same time, this embodiment provides two groups of implementation examples, specifically:

[0058] Implementation Example 1

[0059] The diameter of the heat pipe body 1 is DN300, the medium in the heat pipe body 1 is steam, the steam temperature is 700°C, and the ambient temperature is 25°C.

[0060] The heat insulation support strip 2 has a tangential width of 10 mm along the outer circle of the heat pipe body 1 and a radial height of 10 mm along the heat pipe body 1. It is bonded to the outer circumference of the heat pipe body 1 using 800°C high temperature resistant glue and 8 groups are arranged along the outer circle of the heat pipe body 1.

[0061] The thermal insulation support strip 2 is made of thermal insulation slurry, and the slurry material components include: 100 parts by weight of expanded vermiculite powder with a particle size of 200 mesh, 80 parts by weight of wollastonite, 200 parts by weight of sepiolite wool, 80 parts by weight of sodium bentonite, 50 parts by weight of expanded perlite, 250 parts by weight of sodium silicate, 1000 parts by weight of hollow fly ash floating beads with a particle size of 80, 200 parts by weight of potassium hexatitanate whiskers, 40 parts by weight of hydroxymethyl cellulose, 40 parts by weight of polyacrylamide, and an appropriate amount of tap water is added and stirred and mixed in a disperser to form a thermal insulation slurry; after the slurry is prepared according to the above components, the slurry is poured into a long strip metal mold for molding, and baked at 200°C for 8 hours to obtain the thermal insulation support strip 2.

[0062] A closed ring 8 is provided at the starting end and the end of the length direction of the thermal pipe body 1. The material type is aerogel felt strip of type IV in GB / T34336 standard, and the maximum working temperature is 1000°C. The width of the aerogel felt strip is 20mm and the thickness is 10mm.

[0063] The outer sides of the heat-insulating support strip 2 and the closed ring 8 are covered with a first reflective layer 3, which is made of 304 material, and the roughness of both surfaces is ≤Ra0.4.

[0064] The outer side of the first reflective layer 3 is covered with a second heat-insulating layer 4 with a thickness of 12 mm; the aerogel type used is type III in the GB / T34336 standard, and the maximum operating temperature is 650°C.

[0065] The second heat-insulating layer 4 is covered with a second reflective layer 5 , which is aluminum foil.

[0066] A rock wool felt is installed on the outside of the aluminum foil. The rock wool felt is 70 mm thick and has a maximum use temperature greater than 350° C. An aluminum foil glass cloth waterproof layer 7 is wrapped on the outside of the rock wool felt. The waterproof layer 7 is glued with glue to prevent air gaps at the joints.

[0067] The thermal insulation structure produced has a total thickness of approximately 93 mm.

[0068] According to the test, when the working temperature of the thermal pipeline body is 700℃ and the ambient temperature is 25℃, the maximum inner temperature of the medium temperature section aerogel (second insulation layer 4) is 500℃, the maximum inner temperature of the rock wool felt (third insulation layer 6) is 150℃, the outer surface temperature of the insulation structure material is 45℃, and the measured temperature of the outer surface of the insulation device material is 45.3℃ after one year of use, that is, the insulation efficiency decay is very small after long-term use. The insulation layer thickness of the traditional aluminum silicate fiber insulation structure is 250mm, the outer surface temperature of the insulation material is 50℃, and the outer surface temperature of the insulation device material rises to 60℃ after one year of use.

[0069] It can be seen from this that, compared with the traditional aluminum silicate fiber insulation structure, the insulation efficiency of implementation example 1 can be increased by more than 25%.

[0070] Implementation example 2:

[0071] The diameter of the heat pipe body 1 is DN1000, the medium in the heat pipe body 1 is steam, the steam temperature is 600°C, and the ambient temperature is 25°C. Among them:

[0072] The heat insulation support strip 2 has a tangential width of 10 mm along the outer circle of the heat pipe body 1 and a radial height of 6 mm along the heat pipe body 1. It is bonded to the outer circumference of the heat pipe body 1 using 800°C high temperature resistant glue, and 12 groups are arranged along the outer circle of the heat pipe body 1.

[0073] The thermal insulation support strip 2 is made of thermal insulation slurry, and the slurry material components include: 150 parts by weight of expanded vermiculite powder with a particle size of 500 mesh, 120 parts by weight of wollastonite, 100 parts by weight of sepiolite wool, 120 parts by weight of sodium bentonite, 100 parts by weight of expanded perlite, 150 parts by weight of sodium silicate, 500 parts by weight of hollow fly ash beads with a particle size of 80, 100 parts by weight of potassium hexatitanate whiskers, 20 parts by weight of hydroxymethyl cellulose, and 20 parts by weight of polyacrylamide. An appropriate amount of tap water is added and stirred and mixed in a disperser to form a thermal insulation slurry; after the slurry is prepared according to the above components, the slurry is poured into a long strip metal mold for molding, and baked at 300°C for 8 hours to obtain the thermal insulation support strip 2.

[0074] Similarly, closed rings 8 are provided at the starting and end of the thermal pipe body 1 in the length direction. The material type is type IV aerogel felt strip in GB / T34336 standard, and the maximum working temperature is 1000°C; the width of the aerogel felt strip is 20mm and the thickness is 6mm.

[0075] The first reflective layer 3 is installed on the outer side of the heat-insulating support bar 2 and the closed ring 8. The first reflective layer 3 is made of 304 material, and the roughness of both surfaces is ≤Ra0.4.

[0076] The outer side of the first reflective layer 3 is covered with a medium-temperature aerogel felt (second thermal insulation layer 4) with a thickness of 9 mm; the aerogel type is type III in the GB / T34336 standard, and the maximum operating temperature is 650°C.

[0077] The outer side of the aerogel felt (second thermal insulation layer 4) in the middle temperature section is covered with a second reflective layer 5, which is aluminum foil.

[0078] A rock wool felt (third insulation layer 6) is installed on the outside of the aluminum foil, with a thickness of 50 mm and a maximum operating temperature of greater than 350°C.

[0079] An aluminum foil glass cloth waterproof layer 7 is wrapped on the outside of the rock wool felt, and the waterproof layer 7 is glued at the joints without leaving air gaps.

[0080] Thus, the total thickness of the thermal insulation device manufactured is about 66 mm.

[0081] According to the test, when the working temperature of the heat pipe body 1 is 600℃ and the ambient temperature is 25℃, the maximum inner temperature of the medium temperature section aerogel is 450℃, the maximum working temperature of the rock wool felt is 130℃, the outer surface temperature of the insulation device material is 43℃, and the measured outer surface temperature of the insulation device material is 43.6℃ after one year of use. If the insulation layer thickness of the traditional aluminum silicate fiber insulation structure is 200mm, the outer surface temperature of the insulation material is 49℃, and the outer surface temperature of the insulation device material rises to 56℃ after one year of use.

[0082] It can be seen from this that, compared with the traditional aluminum silicate fiber insulation structure, the insulation efficiency of implementation example 1 can be improved by more than 20%.

[0083] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-temperature thermal pipeline insulation structure, characterized in that: It comprises a plurality of heat-insulating support bars (2) made of heat-insulating material, wherein the plurality of heat-insulating support bars (2) are evenly distributed around the circumference of a preset circle, and the heat-insulating support bars (2) extend axially along the preset circle; The circumference formed by the outer sides of the plurality of heat-insulating support strips (2) is covered with a first reflecting layer (3), and the first reflecting layer (3) is sequentially covered with a second heat-insulating layer (4), a second reflecting layer (5), a third heat-insulating layer (6) and a waterproof layer (7); Both ends of the heat-insulating support strip (2) are provided with closed rings (8), and the closed rings (8) are capable of closing the cavity surrounded by two adjacent heat-insulating support strips (2), the first reflective layer (3) and the outer circumference of the preset circle.

2. The high-temperature thermal pipeline insulation structure according to claim 1 is characterized in that: The number of the heat insulating support bars (2) is 8 to 12, the tangential width of the heat insulating support bars (2) is 5 mm to 10 mm, and the height along the radial direction of the pipeline is 6 mm to 10 mm.

3. The high-temperature thermal pipeline insulation structure according to claim 1 is characterized in that: The heat-insulating support strip (2) is made of a heat-insulating slurry, the heat-insulating slurry material components are: 100-150 parts by weight of expanded vermiculite powder, 80-120 parts by weight of wollastonite, 100-200 parts by weight of sepiolite wool, 80-120 parts by weight of sodium bentonite, 50-100 parts by weight of expanded perlite, 150-250 parts by weight of sodium silicate, 500-1000 parts by weight of fly ash hollow floating beads, 100-200 parts by weight of potassium hexatitanate whiskers, 20-40 parts by weight of hydroxymethyl cellulose, 20-40 parts by weight of polyacrylamide, and an appropriate amount of clean water; wherein the particle size of the fly ash hollow floating beads is 80-120 meshes, and the particle size of the expanded vermiculite is 200 meshes to 500 meshes.

4. The high-temperature thermal pipeline insulation structure according to claim 1 is characterized in that: The closed ring (8) is formed by bonding aerogel strips in the circumferential direction.

5. The high-temperature thermal pipeline insulation structure according to claim 4 is characterized in that: The width of the closed ring (8) is 20 mm to 30 mm; the angle between the closed seam (8a) of the closed ring (8) and the end face of the closed ring (8) is ≤45°.

6. The high-temperature thermal pipeline insulation structure according to claim 1, characterized in that: The first reflective layer (3) is a stainless steel foil, and the surface roughness of the first reflective layer (3) is ≤Ra0.

4.

7. The high-temperature thermal pipeline insulation structure according to claim 1, characterized in that: The second thermal insulation layer (4) is an aerogel layer, and the thickness of the second thermal insulation layer (4) is 9 mm to 12 mm.

8. The high-temperature thermal pipeline insulation structure according to claim 1, characterized in that: The material of the third thermal insulation layer (6) is rock wool felt, and the thickness of the third thermal insulation layer (6) is 50 mm to 70 mm.

9. The high-temperature thermal pipeline insulation structure according to claim 1, characterized in that: The material of the waterproof layer (7) is aluminum foil glass cloth.

10. A high-temperature thermal pipeline, comprising a pipeline body, characterized in that: A high-temperature thermal pipe insulation structure according to any one of claims 1 to 9 is arranged outside the pipe body, and the thermal insulation support strip (2) is installed outside the thermal pipe body.

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