CN205350718U - Compound incubation structure and buried pipeline for heating power thereof - Google Patents

Abstract

The utility model relates to the technical field of thermal insulation structures, and discloses a composite thermal insulation structure and buried pipelines for thermal power. Composite thermal insulation structure, including circular tube-shaped airgel insulation layer, polyurethane insulation layer and shell, the airgel insulation layer is wrapped on the outer circumference of the steel pipe, the polyurethane insulation layer is wrapped on the outer circumference of the airgel insulation layer, and the outer shell is wrapped on the polyurethane insulation layer layer perimeter. Buried pipelines for thermal power, including steel pipes and composite insulation structures, composite insulation structures include airgel insulation layers wrapped around steel pipes, polyurethane insulation layers wrapped around airgel insulation layers, and polyurethane insulation layers Peripheral shell. The composite thermal insulation structure proposed by the utility model and the buried pipeline for thermal power, the composite thermal insulation structure is provided with an airgel thermal insulation layer inside the polyurethane thermal insulation layer to avoid direct contact between the polyurethane thermal insulation layer and the steel pipe, thus avoiding the polyurethane thermal insulation layer due to If the temperature is too high, carbonization and pulverization will cause insulation failure, which saves energy and ensures the safety of the pipeline.

Description

Composite thermal insulation structure and its buried pipeline for thermal power

technical field

The utility model relates to the technical field of thermal insulation structures, in particular to a composite thermal insulation structure and buried pipelines for thermal power.

Background technique

At present, in the field of urban heating, buried pipelines for heating are widely used, and they have good heat insulation and anti-corrosion functions, and the laying cost is low. The application of the buried pipeline for heat power is specified in detail in the existing industry standard CJ114-2000 "High-density polyethylene outer protective pipe polyurethane foam prefabricated direct-buried thermal insulation pipe". The thermal insulation material used in the existing buried pipelines for heating is all polyurethane. The industry standard stipulates that the hot water pipeline should not exceed 120°C, that is to say, 120°C is the highest temperature that polyurethane can withstand. However, the current urban heating pipelines are too large in urban areas, and the heat source power plants are located in the suburbs. The length of the pipelines is too long, and the temperature of the hot water supplied is usually as high as 130-140°C. This will cause the problem of easy carbonization and pulverization of polyurethane. This makes the polyurethane insulation ineffective, and the ineffectiveness of the insulation will lead to waste of energy and failure of the pipeline filled with the medium to bear pressure, resulting in safety problems of collapse.

Utility model content

The purpose of the utility model is to overcome the deficiencies of the above-mentioned prior art, and provide a composite thermal insulation structure and its buried pipeline for heating, which avoids the direct contact between the polyurethane thermal insulation layer and the steel pipe, thereby avoiding the polyurethane thermal insulation layer from being damaged due to excessive temperature. Carbonization and pulverization cause insulation failure, which saves energy and ensures pipeline safety.

The embodiment of the utility model provides a composite thermal insulation structure, which is coated on the outer circumference of the steel pipe of the buried pipeline for thermal power. The composite thermal insulation structure includes a circular tubular airgel thermal insulation layer, a polyurethane thermal insulation layer and a shell. The rubber insulation layer is coated on the outer circumference of the steel pipe for thermal insulation, the polyurethane thermal insulation layer is coated on the outer circumference of the airgel thermal insulation layer and is used for thermal insulation, and the shell is coated on the outer circumference of the polyurethane thermal insulation layer.

Further, the airgel thermal insulation layer is an airgel thermal insulation material.

Further, the airgel heat insulating material has a thickness of 10-20 mm.

Further, the shell is made of polyethylene.

The embodiment of the utility model also provides a buried pipeline for thermal power, which includes a steel pipe, and the buried pipeline for thermal power also includes a composite thermal insulation structure, and the composite thermal insulation structure includes a thermal insulation coating on the outer periphery of the steel pipe. The airgel heat insulation layer, the polyurethane heat insulation layer for heat preservation wrapped on the outer periphery of the airgel heat insulation layer, and the shell wrapped on the outer periphery of the polyurethane heat insulation layer.

Further, the airgel thermal insulation layer is an airgel thermal insulation material.

Further, the airgel heat insulating material has a thickness of 10-20 mm.

Further, the shell is made of polyethylene.

Based on the above-mentioned technical scheme, the composite thermal insulation structure and the buried pipeline for thermal power proposed by the utility model, the composite thermal insulation structure avoids the polyurethane thermal insulation layer and the buried pipeline for thermal power by setting an airgel thermal insulation layer on the inner periphery of the polyurethane thermal insulation layer. The direct contact with the steel pipe in the pipe avoids the heat preservation failure caused by the carbonization of the polyurethane insulation layer due to excessive temperature, saves energy and ensures the safety of the pipeline. At the same time, after using the composite insulation solution, the insulation thickness of the pipeline can be thinned, the outer diameter of the pipeline is reduced, and a lot of manpower and material resources are saved for pipeline production, transportation and installation.

Description of drawings

Fig. 1 is the schematic cross-sectional view of the thermal power buried pipeline proposed by the embodiment of the present invention;

Fig. 2 is a schematic diagram of the vertical section of the buried pipeline for thermal power proposed by the embodiment of the present invention.

detailed description

In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or there may be an intervening element at the same time. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present.

In addition, it should also be noted that the orientation terms such as left, right, up, and down in the embodiments of the present utility model are only relative concepts or refer to the normal use status of the product, and should not be regarded as having restrictive. The realization of the utility model is described in detail below in conjunction with specific embodiments.

As shown in Fig. 1 to Fig. 2, the utility model proposes a composite thermal insulation structure 1, which is coated on the outer circumference of the steel pipe 2 of the buried thermal pipeline and used for thermal insulation. Specifically, the composite thermal insulation structure 1 may include an airgel thermal insulation layer 11, a polyurethane thermal insulation layer 12, and an outer casing 13. Here, the airgel thermal insulation layer 11, the polyurethane thermal insulation layer 12, and the outer casing 13 are all in the shape of a circular tube, wherein the air condensation The glue heat insulation layer 11 is used for heat insulation, and it is coated on the outer periphery of the steel pipe 2; the polyurethane insulation layer 12 is used for heat preservation, and it is coated on the outer periphery of the airgel heat insulation layer 11; the shell 13 is used for structural protection, and its coating on the periphery of the polyurethane insulation layer 12.

The composite thermal insulation structure proposed by the embodiment of the utility model has the following characteristics:

The composite thermal insulation structure proposed by the embodiment of the utility model includes an airgel thermal insulation layer 11 coated on the outer periphery of the steel pipe 2, a polyurethane thermal insulation layer 12 coated on the outer periphery of the airgel thermal insulation layer 11, and a polyurethane thermal insulation layer coated on the outer periphery of the airgel thermal insulation layer 11. 12 peripheral shells 13, so, by setting the airgel heat insulating layer 11 between the polyurethane heat insulating layer 12 and the steel pipe 2 (i.e. the inner periphery of the polyurethane heat insulating layer 12), here, because the maximum service temperature of the polyurethane heat insulating layer 12 is 120°C, and the medium transported by buried pipelines for thermal power is hot water with a temperature as high as 140°C, which exceeds the operating temperature of polyurethane. After adding the airgel thermal insulation layer 11, the polyurethane thermal insulation layer 12 and the buried thermal power pipeline are avoided. The steel pipes 2 in the pipeline are directly in contact with each other, thereby avoiding thermal insulation failure caused by carbonization and pulverization of the polyurethane insulation layer 12 due to excessive temperature, saving energy and ensuring pipeline safety. At the same time, after using the composite insulation solution, the insulation thickness of the pipeline can be thinned, the outer diameter of the pipeline is reduced, and a lot of manpower and material resources are saved for pipeline production, transportation and installation.

Further, in the embodiment of the present utility model, the above-mentioned airgel insulation layer 11 is preferably an airgel insulation material, which is in the shape of a soft blanket and can be processed into any shape. Size and insulation thickness Prefabricated airgel insulation layer 11 . The characteristics of the airgel thermal insulation material are: 1) It has an ultra-low thermal conductivity, which is only 0.016 to 0.020W/m-K under normal conditions, which can improve the thermal insulation effect and reduce the thickness and quantity of thermal insulation materials; 2) It is a non-combustible material, completely Fireproof, passed the UL1709 oil and gas fire test, which can provide longer passive fire protection; 3) Completely hydrophobic and breathable; 4) Super compressive, suitable for various harsh environments; 5) Blanket coil, easy to install, The installation efficiency is improved, and the installation cost is greatly reduced. As mentioned above, by wrapping the first layer of airgel heat insulating material on the outer periphery of the steel pipe 2, the surface temperature of the surface contacting the polyurethane heat insulating layer 12 can be lower than 100°C, thus effectively protecting the heat insulating performance and service life of the polyurethane heat insulating layer 12, It reduces the insulation cost of pipelines and improves the lifespan of pipelines and insulation materials.

Preferably, in the embodiment of the present utility model, the thickness of the airgel heat insulation material selected for the airgel heat insulation layer 11 is preferably 10-20 mm. Of course, according to actual conditions and needs, in other embodiments of the present utility model, the airgel heat insulating material may also have other thicknesses, which are not limited herein.

Preferably, in the embodiment of the present utility model, the above-mentioned shell 13 is preferably a polyethylene piece, which adopts a high-density polyethylene material. Certainly, according to actual conditions and requirements, in other embodiments of the present utility model, the above-mentioned housing 13 can also be made of other materials, which are not limited here.

The utility model proposes a buried pipeline for thermal power. The buried pipeline for thermal power includes a steel pipe 2 and a composite thermal insulation structure 1. The composite thermal insulation structure 1 includes an airgel thermal insulation layer coated on the outer periphery of the steel pipe 2 for thermal insulation. 11 , the polyurethane thermal insulation layer 12 for thermal insulation that is coated on the outer periphery of the airgel thermal insulation layer 11 , and the outer shell 13 that is coated on the outer periphery of the polyurethane thermal insulation layer 12 .

The buried pipeline for thermal power proposed by the embodiment of the utility model includes a steel pipe 2 and a composite thermal insulation structure 1 coated on the outer periphery of the steel pipe 2. The layer 11 avoids direct contact between the polyurethane insulation layer 12 and the steel pipe 2, avoids thermal insulation failure caused by carbonization of the polyurethane insulation layer 12 due to excessive temperature, saves energy, and ensures pipeline safety.

Further, in the embodiment of the present utility model, the above-mentioned airgel insulation layer 11 is preferably an airgel insulation material, which is in the shape of a soft blanket and can be processed into any shape. Size and insulation thickness Prefabricated airgel insulation layer 11 . Here, the airgel insulation material has the characteristics of low thermal conductivity, high temperature resistance and compression resistance. It can form a composite insulation system with polyurethane. Here, the advantages of the two materials are fully utilized, and the airgel insulation material is used for high temperature resistance and Compression resistance, and the thermal conductivity of the airgel thermal insulation material is lower than that of polyurethane, so that the temperature resistance of the composite thermal insulation structure 1 is increased, and the thermal insulation capability is stronger. At the same time, the compressive performance of the airgel thermal insulation material enables the composite thermal insulation structure 1 to be better combined with the steel pipe 2, which solves the mechanical problem, that is, it is not afraid of violent transportation, and can meet various violent trampling or assembly.

Preferably, in the embodiment of the present utility model, the thickness of the airgel heat insulation material selected for the airgel heat insulation layer 11 is preferably 10-20 mm. Of course, according to actual conditions and needs, in other embodiments of the present utility model, the airgel heat insulating material may also have other thicknesses, which are not limited herein.

Preferably, in the embodiment of the present utility model, the above-mentioned shell 13 is preferably a polyethylene piece, which adopts a high-density polyethylene material. Certainly, according to actual conditions and requirements, in other embodiments of the present utility model, the above-mentioned housing 13 can also be made of other materials, which are not limited here.

The above-described embodiments are only specific implementation methods of the utility model, but the scope of protection of the utility model is not limited thereto. Any person familiar with the technical field can easily think of various Equivalent modifications, replacements and improvements, etc., all of which should be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be based on the protection scope of the claims.

Claims (8)

1. compound insulation structure, it is coated on the steel pipe periphery of heating power buried pipeline, it is characterized in that, described compound insulation structure includes the aerogel insulation layers of circular tube shaped, polyurethane insulation coating and shell, described aerogel insulation layers is coated on the periphery of described steel pipe and for thermal insulation, described polyurethane insulation coating is coated on the periphery of described aerogel insulation layers and for being incubated, and described shell is coated on the periphery of described polyurethane insulation coating.

2. compound insulation structure as claimed in claim 1, it is characterised in that described aerogel insulation layers is aerogel heat-insulating material.

3. compound insulation structure as claimed in claim 2, it is characterised in that the thickness of described aerogel heat-insulating material is 10～20mm.

4. the compound insulation structure as described in any one of claims 1 to 3, it is characterised in that described shell is polyethylene part.

5. heating power buried pipeline, including steel pipe, it is characterized in that, described heating power buried pipeline also includes compound insulation structure, described compound insulation structure includes the aerogel insulation layers for thermal insulation being coated on described steel pipe periphery, it is coated on the polyurethane insulation coating for being incubated of described aerogel insulation layers periphery, and is coated on the shell of described polyurethane insulation coating periphery.

6. heating power buried pipeline as claimed in claim 5, it is characterised in that described aerogel insulation layers is aerogel heat-insulating material.

7. heating power buried pipeline as claimed in claim 6, it is characterised in that the thickness of described aerogel heat-insulating material is 10～20mm.

8. the heating power buried pipeline as described in any one of claim 5 to 7, it is characterised in that described shell is polyethylene part.