CN105715912A - Pipeline heat preservation structure and application thereof - Google Patents

Abstract

The invention relates to a pipeline heat preservation structure, which includes one or more heat insulation components and an outer packaging layer, wherein each heat insulation component includes an aluminum foil layer, a heat insulation coating and an airgel insulation layer arranged in sequence. Thermal layer, when there are multiple thermal insulation components, the multiple thermal insulation components are stacked; the outer packaging layer is the outermost structure of the pipeline thermal insulation structure, and the outer packaging layer is the outer flexible packaging layer, or It is the outer hard packaging layer. Pipe insulation structures can be used for steam pipes. The pipe insulation structure proposed by the invention uses aluminum foil, heat insulation coating, and airgel in combination, which effectively reduces heat loss, and has the characteristics of reflected heat, water repellency, and high temperature resistance, and the heat insulation effect is better than that of the existing heat insulation Materials improved by 10%~20%.

Description

A kind of pipe insulation structure and its application

technical field

The invention relates to a pipeline heat insulation structure, in particular to a pipeline heat insulation structure and its application.

Background technique

In the pipeline outsourcing structure, there are mainly the outsourcing structure for the transmission pipeline and the outsourcing structure for the steam pipeline. At present, the outsourcing structure of the transportation pipeline generally adopts the method of calcium silicate material coating and polyurethane material coating. The method of calcium silicate material coating has the defects of poor sealing, only temperature resistance, easy damage, and water absorption. , The sealing method of polyurethane materials has the defect of water absorption and temperature resistance. Since steam pipelines have high requirements for thermal insulation, it is obvious that the current sealing method of transportation pipelines cannot guarantee the thermal insulation performance requirements of steam pipelines, so it is not suitable for steam pipelines.

In addition, due to the high heat loss requirements of steam for steam pipes, it is difficult for the current heat preservation structure of steam pipes to meet this requirement. In order to reduce heat loss and ensure that the temperature at the outlet of the pipeline can reach or be as close as possible to the temperature at the inlet, the method of increasing the gas transmission volume is generally adopted, but this method not only requires high technology and equipment, but also reduces the effect of heat loss. not ideal.

Contents of the invention

In order to solve the above-mentioned technical problems, the present invention proposes a pipe insulation structure and its application. The aluminum foil layer, heat insulation coating and airgel heat insulation layer are alternately laminated and overlapped to form a heat insulation component with small heat loss.

The present invention proposes following technical scheme:

(1) A pipeline insulation structure, which includes one or more heat insulation components and outer packaging layers, wherein each heat insulation component includes an aluminum foil layer, a heat insulation coating and an airgel insulation layer arranged in sequence Thermal layer, when there are multiple thermal insulation components, the multiple thermal insulation components are stacked; the outer packaging layer is the outermost structure of the pipeline thermal insulation structure, and the outer packaging layer is the outer flexible packaging layer, or It is the outer hard packaging layer.

(2) On the basis of the above solution (1), the airgel heat insulating layer is a hydrophobic airgel.

(3) On the basis of the above scheme (1) or (2), the airgel insulation layer adopts silica airgel.

(4) On the basis of the above solution (1), (2) or (3), in each thermal insulation component, a thermal insulation coating is provided on the side of the aluminum foil layer away from the airgel thermal insulation layer.

(5) On the basis of any one of the above solutions (1) to (4), the pipe insulation structure further includes a cladding layer, and the cladding layer is arranged inside the outer packaging layer.

(6) On the basis of the above solution (5), the cladding layer is a closed-cell foam layer formed by providing a heat reflective coating on the inside and/or outside of the aluminum foil.

(7) On the basis of any of the above schemes (1) to (6), the pipeline insulation structure also includes one or more second airgel insulation layers, and the one or more second airgel insulation layers The glue heat insulation layer is arranged on the outer side of the one or more heat insulation components.

(8) On the basis of the above solution (7), the one or more second airgel insulation layers are made of hydrophobic airgel.

(9) On the basis of any one of the above solutions (1) to (8), the first airgel heat insulation layer and/or the second airgel heat insulation layer is an airgel heat insulation blanket.

(10) On the basis of any of the above schemes (1) to (9), when the outer packaging layer is the outer flexible packaging layer, in the high temperature zone where the temperature is >= 260°C, the outer flexible packaging layer is made of hydrophobic glass cloth ; In the middle temperature zone where the temperature is <260℃, the outer flexible packaging layer is made of fluorine-containing glass cloth.

(11) On the basis of any of the above schemes (1) to (10), when the outer packaging layer is the outer hard packaging layer, the outer hard packaging layer is made of aluminum material.

(12) On the basis of any of the above schemes (1) to (9) and (11), when the outer packaging layer is the outer hard packaging layer, fluorocarbon paint is added to the outer layer of the outer hard packaging layer.

(13) On the basis of any of the above schemes (1)-(9), (11) and (12), a water guide hole is provided on the outer hard packaging layer, and the water guide hole includes a water guide groove and a water flow hole.

(14) On the basis of any of the above-mentioned schemes (1) to (13), each layer of the pipe insulation structure is in the shape of a matching inclined plane at the overlapping joints on both sides.

(15) On the basis of any of the above schemes (1) to (14), the pipeline is a steam pipeline.

(16) A use of the pipeline insulation structure according to any one of the preceding schemes, the pipeline insulation structure being used in steam pipelines.

Beneficial effects of the present invention: the pipe insulation structure proposed by the present invention uses aluminum foil, thermal insulation coating, and airgel in combination, which effectively reduces heat loss, and at the same time has the characteristics of heat reflection, hydrophobicity, and high temperature resistance. The existing thermal insulation material is improved by 10%-20%.

Description of drawings

Fig. 1 is a schematic structural diagram of Embodiment 1 of the present invention.

Fig. 2 is a schematic structural diagram of Embodiment 2 of the present invention.

Fig. 3 is a schematic structural diagram of Embodiment 3 of the present invention.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings. However, those skilled in the art know that the present invention is not limited to the drawings and the following embodiments.

Example 1:

The pipe insulation structure proposed by the present invention is shown in FIG. 1 . The pipe insulation structure includes a first aluminum foil layer, a thermal insulation coating, a first airgel thermal insulation layer, a cladding layer and an outer packaging layer. Preferably, the conduit is a steam conduit.

The first aluminum foil layer is an inner layer, and the use of aluminum foil in the inner layer can effectively reduce heat radiation.

A thermal insulation coating (not shown) is provided between the first aluminum foil layer and the first airgel thermal insulation layer. The thermal insulation coating has a high thermal emissivity, emissivity>0.85, thereby reducing thermal radiation. Furthermore, a thermal insulation coating can also be provided on the side of the first aluminum foil layer away from the first airgel thermal insulation layer, so as to further reduce heat radiation.

The first airgel heat insulation layer is used as a heat insulation material and is arranged on the outside of the heat insulation coating, which can effectively improve the heat insulation effect and improve the fireproof performance. Preferably, the aerogel is a hydrophobic aerogel, which can reduce hydrophobic measures. The first airgel heat insulating layer preferably uses silica airgel.

As the outermost structure of the pipe insulation structure, the outer packaging layer can be an outer soft packaging layer or an outer hard packaging layer. Whether the outer packaging layer adopts the outer soft packaging layer or the outer hard packaging layer is selected according to conditions such as the pipeline use occasion and construction requirements.

When the outer packaging layer is the outer flexible packaging layer, a second heat-insulating coating with hydrophobic properties may be provided on the outer flexible packaging layer. The second heat-insulating coating with hydrophobic properties is arranged inside the outer soft packaging layer to further enhance the hydrophobic effect of the outer soft packaging layer and further reduce heat radiation. In the high temperature zone where the temperature is >=260°C, the outer layer of flexible packaging is made of hydrophobic glass cloth; in the medium temperature zone where the temperature is <260°C, fluorine-containing glass cloth can be used.

The cladding layer is located inside the outer packaging layer. Preferably, the cladding layer is a closed-cell foam layer formed by providing a heat reflective coating on the inside and/or outside of the aluminum foil. Of course, in occasions where the requirements for heat radiation are not high, the cladding layer may not be provided.

In addition, in order to further improve the thermal insulation effect of the thermal insulation material, one or more second airgel thermal insulation layers can be set outside the first airgel thermal insulation layer (refer to Figure 2) to play the role of auxiliary thermal insulation . Preferably, the second airgel insulation layer can be made of hydrophobic aerogel, which can further reduce the effect of hydrophobic measures. Wherein, the first airgel heat insulation layer and the second airgel heat insulation layer can use airgel heat insulation layers of the same material. The first airgel insulation layer and/or the second airgel insulation layer is preferably an airgel insulation blanket.

When the outer packaging layer is the outer hard packaging layer, the mechanical performance of the thermal insulation structure during installation can be increased. The outer hard packaging layer can be made of aluminum, galvanized iron and other materials. Aluminum is preferred due to its better corrosion resistance than galvanized iron.

In addition, fluorocarbon paint can be added to the outer layer of the outer hard packaging layer to further enhance the anti-corrosion and moisture-proof performance.

In order to prevent water from flowing into the pipe insulation structure of the present invention, each layer of the pipe insulation structure is in the shape of a matching inclined plane at the overlapping joints on both sides.

During construction, the thermal insulation coating is applied on the first aluminum foil layer, and the first aluminum foil layer and the first airgel thermal insulation layer can be sequentially sewn or wound with aramid fibers or aramid fibers containing steel wires. etc. are coated on the outside of the steam pipe.

Example 2:

The difference between this embodiment and Embodiment 1 is that in this embodiment, the aluminum foil layer, the thermal insulation coating and the airgel thermal insulation layer are alternately stacked and overlapped. Figure 2 only shows two groups of aluminum foil layers, the thermal insulation coating and the As for the structure formed by overlapping and overlapping the airgel heat insulation layers alternately, those skilled in the art can know that 3 or more sets of laminated structures can be used to further improve the effect of heat insulation. The one or more second airgel heat insulation layers are arranged outside the outermost airgel heat insulation layer. Other contents are the same as those in Embodiment 1, and will not be repeated here.

Example 3:

The only difference between this embodiment and Embodiments 1 and 2 is that drainage holes are set on the outer packaging layer (for example, the outer hard packaging layer), as shown in Figure 3, to dredge rainwater, mist, etc. in the use environment to prevent water leakage. into the insulation structure. Other contents are the same as those in Embodiments 1 and 2, and will not be repeated here.

Example 4:

Examples of the use of the above-mentioned embodiments 1 to 3: the outer diameter of the pipe is 400mm, the pipe wall thickness is 10mm, and the temperature is 420°C hot injection steam pipe (straight pipe section), the annual average wind speed is 2.8m/s, and the annual average temperature is 28.6°C. The above-mentioned pipe insulation structure can be adopted.

The embodiments of the present invention have been described above. However, the present invention is not limited to the above-mentioned embodiments. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A pipeline thermal insulation structure, characterized in that the pipeline thermal insulation structure comprises one or more thermal insulation components and an outer packaging layer, wherein each thermal insulation component comprises an aluminum foil layer, a thermal insulation coating and an air Gel heat insulation layer, when there are multiple heat insulation components, the multiple heat insulation components are stacked; the outer packaging layer is the outermost structure of the pipeline insulation structure, and the outer packaging layer is the outer flexible packaging layer, or the outer hard packaging layer. 2. The pipeline insulation structure according to claim 1, characterized in that the airgel heat insulation layer is hydrophobic aerogel, or the airgel heat insulation layer is made of silica airgel. 3. The pipeline insulation structure according to claim 1, characterized in that, in each heat insulation component, a heat insulation coating is provided on the side of the aluminum foil layer away from the airgel heat insulation layer. 4. The pipeline insulation structure according to claim 1, characterized in that the pipeline insulation structure further comprises a cladding layer, and the cladding layer is arranged inside the outer packaging layer. Preferably, the cladding layer is a closed-cell foam layer formed by providing a heat reflective coating on the inside and/or outside of the aluminum foil. 5. The pipeline thermal insulation structure according to claim 1, characterized in that, the pipeline thermal insulation structure further comprises one or more second airgel insulation layers, and the one or more second airgel insulation layers A layer is disposed on the outside of the one or more insulation components. Preferably, the one or more second airgel insulation layers are made of hydrophobic aerogel. Preferably, the first airgel insulation layer and/or the second airgel insulation layer is an airgel insulation blanket. 6. The pipeline insulation structure according to claim 1, characterized in that, when the outer packaging layer is an outer flexible packaging layer, the outer flexible packaging layer is made of hydrophobic glass cloth in a high temperature zone where the temperature is >= 260°C; In the middle temperature zone of <260°C, the outer flexible packaging layer is made of fluorine-containing glass cloth. 7. The pipeline insulation structure according to claim 1, wherein when the outer packaging layer is an outer hard packaging layer, the outer hard packaging layer is made of aluminum material. Preferably, fluorocarbon paint is applied to the outer layer of the outer hard packaging layer. Preferably, water guide holes are provided on the outer hard packaging layer. 8. The pipeline insulation structure according to claim 1, 4 or 5, characterized in that, the overlapping parts of each layer of the pipeline insulation structure are in the shape of matching slopes. 9. The pipe insulation structure according to any one of claims 1 to 8, characterized in that the pipe is a steam pipe. 10. The application of the pipeline insulation structure according to any one of claims 1 to 9, characterized in that the pipeline insulation structure is used for steam pipelines.