CN218409064U

CN218409064U - Aerogel composite thermal insulation layer and heat insulation pipeline

Info

Publication number: CN218409064U
Application number: CN202222643709.6U
Authority: CN
Inventors: 张立文; 张君; 陈学元
Original assignee: Shaanxi Mengchuang Nano New Material Co ltd
Current assignee: Shaanxi Mengchuang Nano New Material Co ltd
Priority date: 2022-10-09
Filing date: 2022-10-09
Publication date: 2023-01-31
Anticipated expiration: 2032-10-09

Abstract

The utility model discloses an aerogel composite thermal insulation layer and a thermal insulation pipeline, wherein the aerogel composite thermal insulation layer comprises n layers of thermal insulation layers wrapped on a pipe body, and an outer protection layer is arranged outside the n layers of thermal insulation layers; each layer of heat insulation layer comprises an aerogel heat insulation felt, a metal foil reflection layer and an aerogel fireproof heat insulation coating layer which are sequentially stacked from inside to outside; the metal foil reflecting layer is spirally wound on the outer portion of the aerogel heat insulation felt, and the aerogel fireproof heat insulation coating layer is coated on the outer portion of the metal foil reflecting layer. The utility model discloses compound mutually with the adiabatic felt of aerogel, metal forming reflection stratum, perfect separation heat exchange's radiation, conduction and three kinds of modes of convection have overcome the not good scheduling problem of adiabatic effect that exists in the simple multilayer parcel of tradition, and the aerogel is compared the required thickness of traditional insulation material and is under the equal heat preservation effect littleer with the construction space, is showing and is reducing the combined cost.

Description

Aerogel composite thermal insulation layer and heat insulation pipeline

Technical Field

The utility model belongs to the technical field of keep warm and keep cold, a compound insulating layer of aerogel and thermal-insulated pipeline are related to, more specifically say and relate to a chemical industry, take the heat preservation cold insulation pipeline in fields such as viscous crude, house heating.

Background

In the industrial field, the distance of a high-temperature pipeline is long, for example, the distance from a heat source to a heat-using part in the metallurgy, chemical industry and thermoelectric industry is generally not less than 3 kilometers, the heat energy is seriously lost in the long-distance transmission process, and the heat loss per kilometer accounts for 26% of the total output of a heat source plant calculated by a design with the heat dissipation loss per 100 meters, which means that the heat power of more than 1/4 of the heat power is 'no output when the heat source plant is out of service', and disappears before the heat source plant plays a role in production.

In order to reduce heat transfer loss, heat insulation materials such as rock wool, aluminum silicate and composite silicate are wound outside the existing heat transfer pipeline, but due to the reasons of loose structure, poor tensile and compressive properties, low adhesive force and the like of the wrapping materials, the materials are easy to settle due to vibration, dead weight and the like of the steam pipeline, particularly under the condition of rain and water inflow, the non-completely waterproof heat insulation materials are more obvious in settlement phenomenon, so that the heat insulation materials collapse, and the heat insulation effect is reduced year by year. Therefore, new heat insulation materials and structures are researched and adopted aiming at the urgent need of long-distance steam pipelines, and the aims of saving energy, reducing consumption and improving the terminal temperature are fulfilled.

Aerogel materials are popular in various fields such as military, aerospace, chemical engineering, energy conservation, new energy and the like as representative materials in the technical field of heat preservation and cold insulation. The surface of the aerogel material matrix has a good three-dimensional network pore structure, so that heat flow can only be transmitted along the pore walls when being transmitted in the aerogel material matrix in the process of contacting an external heat source, the unique structure with high specific surface area and high porosity ensures that the heat conduction effect of the material matrix is most effectively inhibited, the heat conduction capability of the surface of the aerogel material matrix is reduced to be close to the lowest limit, and good heat preservation and cold preservation effects can be shown in the temperature range of-160 ℃ to 1200 ℃.

The Chinese patent 'steam low-energy consumption long-distance conveying pipeline and steam conveying system containing aerogel' with the application number of 201810616431.9 discloses a low-energy consumption long-distance conveying pipeline, which comprises a steam pipe, at least two heat insulation layers, at least two reflecting layers and an outer protective layer, wherein the heat insulation layers are wrapped outside the steam pipe, the reflecting layers and the heat insulation layers are alternately wrapped, and the outer protective layer is wrapped outside the last reflecting layer; the heat-insulating layer comprises an aerogel felt layer and a composite aerogel felt layer. The composite heat insulation layer has the problems that when the reflecting layer and the heat insulation layer are wrapped in a pipeline at intervals, gaps exist between the layers to cause heat loss, and the heat insulation effect is influenced; meanwhile, the gaps easily cause the intrusion corrosion of rainwater and condensed water to the pipeline, and the service life of the equipment is shortened.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the not good, short-lived, bulky scheduling problem of heat preservation efficiency that current heat transfer pipeline adopted traditional insulation material to appear, providing an aerogel composite insulation layer and thermal-insulated pipeline scheme.

The technical scheme of the utility model as follows:

an aerogel composite thermal insulation layer comprises n layers of thermal insulation layers wrapped on a pipe body, wherein an outer protection layer is arranged outside the n layers of thermal insulation layers; each layer of heat insulation layer comprises an aerogel heat insulation felt, a metal foil reflection layer and an aerogel fireproof heat insulation coating layer which are sequentially stacked from inside to outside; the metal foil reflecting layer is spirally wound on the outer portion of the aerogel heat insulation felt, and the aerogel fireproof heat insulation coating layer is coated on the outer portion of the metal foil reflecting layer.

In the aerogel composite thermal insulation layer, the aerogel thermal insulation felt in each thermal insulation layer is a single layer and is overlapped and lapped in the angle range of 45-135 degrees at two sides of the vertical center line of the cross section of the horizontal pipeline along the longitudinal seam of the horizontal pipeline.

In the aerogel composite heat insulation layer, the longitudinal seams of the aerogel heat insulation felt 2 in the adjacent heat insulation layers are distributed in the first seam area and the second seam area on two sides of the vertical center line of the cross section of the horizontal pipeline in a staggered mode.

In the aerogel composite thermal insulation layer, aerogel fireproof thermal insulation coating is filled between transverse seams of aerogel thermal insulation felts in each thermal insulation layer.

In the aerogel composite heat insulation layer, the thickness of the aerogel heat insulation felt is 8-12mm.

In the aerogel composite thermal insulation layer, the thickness of the metal foil reflecting layer is 0.5mm.

In the above-mentioned aerogel composite insulation layer, the thickness of the outside aerogel fire prevention heat insulating coating layer of metal foil reflecting layer is 0.5mm.

In the aerogel composite thermal insulation layer, n =1 to 5.

The utility model provides an aerogel composite heat insulation pipeline, includes body and the compound insulating layer of aerogel of parcel on the body.

In the aerogel composite heat insulation pipeline, the pipeline is a metal pipeline with the surface subjected to antiseptic treatment.

The utility model has the advantages that:

1. the utility model discloses with the adiabatic felt of aerogel, the metal forming reflection stratum is compound mutually, the adiabatic felt of aerogel adopts the lapped mode of seam overlap, the metal forming reflection stratum is in the outside of the adiabatic felt of aerogel with the heliciform winding to adopt aerogel fire prevention thermal-insulated coating to realize bonding and adiabatic heat preservation between the layer, three kinds of modes of radiation, conduction and the convection current of perfect separation heat exchange have overcome the not good scheduling problem of adiabatic effect that traditional simple multilayer parcel exists. The hydrophobic nature of aerogel has been utilized simultaneously can effectively ensure the water-proof effects of pipeline heat preservation, further improves its heat preservation and thermal insulation performance, and aerogel compares the required thickness of traditional insulation material and construction space littleer under equal heat preservation effect, is showing reduction comprehensive cost.

2. The utility model discloses a vertical seam setting of the adiabatic felt of aerogel is in 45 to 135 angle within ranges of the 7 both sides of horizontal duct cross section vertical center line, and the vertical seam of the adiabatic felt of aerogel in the adjacent composite insulation layer, crisscross distribution is in the both sides of horizontal duct cross section vertical center line, when not influencing the heat preservation effect, overcomes the body that the seam crossing influenced and caused by drenching with rain and dewfall in the long-term use as far as possible and corrodes, has prolonged life.

Drawings

Fig. 1 is a schematic view of the aerogel composite heat insulation pipeline of the present invention;

FIG. 2 is a schematic view of the structure of the metal foil reflection layer of the present invention

FIG. 3 is a schematic view of the location of the joints of the aerogel insulation blanket of the present invention;

FIG. 4 is a schematic view of the aerogel insulation blanket seam construction of the present invention in the first seam region;

FIG. 5 is a schematic view of the aerogel insulation blanket seam construction of the present invention in the second seam region;

in the figure: 1-a pipe body; 2-aerogel insulation blanket; 3-a metal foil reflective layer; 4-aerogel fireproof and heat-insulation coating layer; 5-an outer protective layer; 6-a first seam region; 7-vertical centerline; 8-longitudinal seams; 9-second seam region.

Detailed Description

The aerogel is a nano porous solid material with a network structure formed by mutually aggregating colloidal particles or high polymer molecules by taking a dispersion medium as gas, the diameter of basic particles of the aerogel network structure is 1-20 nm, and the size of pores is 1-100 nm. The pore size of the aerogel is lower than the mean free path of air molecules under normal pressure, so that the air molecules are approximately static in the pores of the aerogel, thereby avoiding the convection heat transfer of air, the extremely low volume density of the aerogel and the curved path of the nano-network structure also prevent the gaseous and solid heat conduction, and the infinite gap wall can reduce the heat radiation to the minimum. The three aspects act together, almost all ways of heat transfer are blocked, and the aerogel achieves the heat insulation effect which cannot be achieved by other materials and is even far lower than the heat conductivity coefficient of static air at normal temperature.

Because the outward appearance of aerogel is because extremely strong difficult direct use of inertia, the utility model discloses combine aerogel and inorganic fiber to prepare into felt and coating to utilize its excellent thermal insulation performance to replace traditional insulation material. In order to overcome the problem that the heat insulation of aerogel can not be fully performed due to the direct flowing heat dissipation of air of the traditional multilayer felt, the three modes of perfect heat exchange, heat radiation, heat conduction and heat convection are formed by bonding layers by using the heat-insulation aerogel fireproof heat-insulation coating in the construction process. Further improves the heat preservation and insulation performance, further reduces the usage amount of the felt and reduces the cost.

As shown in fig. 1 and 2, the aerogel composite heat insulation pipeline of the present invention includes a pipe body 1 of the pipeline and 1 to 5 layers of composite heat insulation layers wrapped on the pipe body 1, wherein an outer protection layer 5 is disposed outside the composite heat insulation layers; each layer of composite heat insulation layer comprises an aerogel heat insulation felt 2, a metal foil reflecting layer 3 and an aerogel fireproof heat insulation coating layer 4 which are sequentially stacked from inside to outside; the aerogel insulation blanket 2 is typically wrapped in a single layer, with the seams overlapping; the metal foil reflecting layer 3 is spirally wound outside the aerogel heat insulation felt 2, and the aerogel fireproof heat insulation coating layer 4 is coated outside the metal foil reflecting layer 3. If the pipe body is a metal pipeline, the surface of the pipe body needs to be subjected to anti-corrosion treatment in advance.

The aerogel heat insulation felt 2 is a nano aerogel heat insulation felt with the thickness of 10mm, which is developed by Shaanxi union innovative nano novel material LLC company, the required nano holes and the corresponding gel frameworks are obtained through a sol-gel process, the glass fiber product is reinforced by adopting tetraethoxysilane, and the reinforced glass fiber composite product is formed through drying through a special process. The heat insulation principle is that the aerogel has infinite nano holes, so that heat flow can only be transmitted along the pore wall when being transmitted in the solid, and the heat conduction capability of the solid is reduced to be close to the lowest limit. Particularly, when the diameter of the pores in the aerogel material is less than 70nm, the air molecules in the pores lose the free flowing ability and are relatively attached to the pore walls, and the material is in a state of approximate vacuum. The number of air hole walls in the material tends to be infinite every day, and the air hole walls have the function of a heat shield, so that the radiation heat transfer is reduced to be nearly the lowest limit,

as shown in fig. 2, the metal foil reflection layer 3 is formed by winding a commercially available metal foil tape with a thickness of 0.5mm spirally and semi-overlappingly on the outside of the aerogel heat insulation blanket 2, and reflects and blocks heat by using the surface reflection characteristic of the aerogel heat insulation blanket while fixing the same.

The aerogel fireproof heat-insulation coating layer 4 is also developed by Shanxi union creative novel nano material LLC (finite responsible corporation), and the principle is that aerogel micro powder, high-temperature-resistant water-based resin and filler are perfectly combined, so that the aerogel nano-pore structure and excellent heat-insulation performance are reserved. Meanwhile, the paint has the excellent characteristics of high and low temperature resistance, flame retardance/fire resistance, convenience in construction, energy conservation, environmental friendliness and the like. The function of the project is to play roles of bonding, heat insulation, flame retardance and fire prevention among layers. The outermost part of the composite heat insulation layer is protected by a 0.6mm metal galvanized iron sheet.

As shown in figures 3 to 5, in order to prolong the service life and prevent the influence of rain and dew on the heat insulation layer, the aerogel heat insulation felt 2 in each composite heat insulation layer is a single layer and is overlapped in the angle range of 45 degrees to 135 degrees on two sides of the vertical center line 7 of the cross section of the horizontal pipeline along the longitudinal joint 8 of the horizontal pipeline. The considered factor is that if the seam is arranged at the upper end of the horizontal pipeline, rainwater easily seeps into the pipe body from the seam at the upper end to cause corrosion in rainy days, and the service life is influenced; if the joint is arranged at the lower end of the horizontal pipeline, the outside of the hot pipeline can be dewed in winter, so that condensed water is mainly condensed at the lower end of the horizontal pipeline and then permeates into the pipe body from the joint of the lower end to cause corrosion of the pipe body; the joints of the aerogel insulation blanket 2 are disposed within a certain angular range on both sides of the vertical center line 7 of the cross-section of the duct, i.e., the first joint region 6 in fig. 4 and the second joint region 9 in fig. 5. In addition, the aerogel thermal insulation felt 2 adopts a block structure customized in specification, and aerogel fireproof thermal insulation coating is filled between each block and the transverse joint between each block, so that the heat dissipation of a gap is avoided.

For n layers of composite heat insulation layers, the longitudinal joints 8 of the aerogel heat insulation felt 2 in each adjacent layer of composite heat insulation layer are distributed in a first joint area 6 and a second joint area 9 on two sides of the vertical center line of the cross section of the horizontal pipeline in a staggered mode, for example, the longitudinal joints of the first and third layers of aerogel heat insulation felt 2 are arranged in the first joint area 6, the longitudinal joints of the second and fourth layers of aerogel heat insulation felt 2 are arranged in the second joint area 9, and the problem of local uneven heat dissipation caused by the joints is solved as much as possible. According to where n =1 to 5, preferably n =2 or 3. Tests prove that the 300-DEG C hot oil metal pipeline is lowered to the outside temperature at normal temperature, and 3 layers of composite heat insulation layers are generally needed.

During construction, the cut aerogel heat insulation felt is tightly attached to a pipeline for laying, the starting end is fixed by a galvanized iron wire or a high-temperature adhesive tape, and the binding distance is 200-300 mm. After the aerogel heat-insulating felt heat-insulating layer is constructed, the aerogel heat-insulating felt heat-insulating layer is continuously wrapped with a metal foil reflecting layer, the metal foil reflecting layer is fixed on the pipeline through a spiral winding method, the aerogel heat-insulating felt is completely wrapped in the metal foil reflecting layer, the binding is smooth, the lap joint size is not less than 50mm, half of the width of the aerogel heat-insulating felt heat-insulating layer is suitable, and the function of the aerogel heat-insulating layer is reflected heat radiation.

After the metal foil reflecting layer is constructed, a layer of aerogel fireproof heat-insulating coating is coated on the surface of the metal foil reflecting layer, and most of radiant heat energy is reflected and blocked by the reflecting effect of the reflecting layer of the coating on heat energy radiation and the effective inhibition of a static air layer on radiation and convection heat transfer.

After the above procedures are repeated, the outermost metal protective shell is made of galvanized iron sheet, and the outer circumference of the galvanized iron sheet is blanked and is lengthened by 30-50mm compared with the outer circumference of the aerogel heat-insulating layer. One side of the protective shell in the circumferential and longitudinal lap joint is pressed with convex ribs, the circumferential lap joint size is not less than 50mm, and the longitudinal lap joint size is not less than 30mm. The construction should be done from bottom to top, and the joint should be put up and down. The outer sheath is fastened by stainless steel bands and fasteners at intervals of 300mm, and the longitudinal joints are fastened by stainless steel tapping screws at intervals of 200 mm. The length of the screw is proper so as not to damage the heat-insulating layer.

The utility model discloses in the heat dissipation construction of a certain oil Tian Gaowen steam conduit in Xinjiang, adopt the thermal-insulated felt of nanometer aerogel that 10mm is thick, 0.5mm metal forming reflection stratum phase and aerogel fire prevention thermal-insulated coating to add the compound reflection formula insulation construction of outer 0.6mm metal galvanized iron sheet, reducible heat loss and energy are extravagant, improve heat utilization efficiency. Compared with traditional heat-insulating materials such as rock wool and polyurethane, the volume of the material used for achieving the heat-insulating effect is only less than 20% of the volume of the silicate rock tile and the rock wool. And because of the reasons of water absorption of rock wool, decomposition of organic adhesive and the like, the rock wool is required to be repaired after being used for one to two years, and the aerogel fireproof heat-insulating coating and aerogel heat-insulating felt composite material can be used for about 20 years, so that the benefit is improved, and the cost is reduced.

Claims

1. The utility model provides an aerogel composite insulation layer which characterized in that: comprises n layers of heat insulation layers wrapped on a pipe body (1), wherein an outer protection layer (5) is arranged outside the n layers of heat insulation layers; each layer of heat insulation layer comprises an aerogel heat insulation felt (2), a metal foil reflection layer (3) and an aerogel fireproof heat insulation coating layer (4) which are sequentially stacked from inside to outside; the metal foil reflecting layer (3) is wound outside the aerogel heat insulation felt (2) in a spiral shape, and the aerogel fireproof heat insulation coating layer (4) is coated outside the metal foil reflecting layer (3).

2. The aerogel composite insulation layer according to claim 1, wherein: the aerogel heat insulation felt (2) in each heat insulation layer is a single layer and is overlapped and lapped in the angle range of 45 degrees to 135 degrees at two sides of the vertical center line (7) of the cross section of the horizontal pipeline along the longitudinal joint (8) of the horizontal pipeline.

3. The aerogel composite insulation layer of claim 1, wherein: longitudinal seams (8) of aerogel insulation blankets (2) in adjacent insulation layers are staggered in a first seam area (6) and a second seam area (9) on both sides of a vertical center line of a horizontal duct cross section.

4. The aerogel composite insulation layer according to claim 1, wherein: aerogel fireproof heat insulation coatings are filled between transverse seams of the aerogel heat insulation felt (2) in each layer of heat insulation layer.

5. The aerogel composite insulation layer according to claim 1, wherein: the thickness of the aerogel heat insulation felt (2) is 8-12mm.

6. The aerogel composite insulation layer according to claim 1, wherein: the thickness of the metal foil reflecting layer (3) is 0.5mm.

7. The aerogel composite insulation layer of claim 1, wherein: the thickness of the aerogel fireproof heat-insulation coating layer (4) outside the metal foil reflecting layer (3) is 0.5mm.

8. The aerogel composite insulation layer according to claim 1, wherein: n =1 to 5.

9. An aerogel composite insulating pipe, characterized by comprising a pipe body (1) and an aerogel composite insulating layer according to any of claims 1 to 8 wrapped on the pipe body.

10. An aerogel composite insulated duct according to claim 9, characterized in that: the pipeline is a metal pipeline with the surface subjected to anti-corrosion treatment.