A high temperature resistant heat insulation pipe

Abstract

The present invention discloses a high temperature resistant heat-insulated pipe. The high temperature resistant heat-insulated pipe comprises a pipe body, a first insulation layer and a second insulation layer; the first insulation layer and the second insulation layer are sequentially wrapped around the outside of the pipe body; the pipe body is sequentially divided into a first section, a second section and a third section along the flow direction of the fluid inside the pipe body; the second insulation layer is arranged in the second section and the third section; the second insulation layer arranged in the third section comprises a first carbon steel layer, a serpentine layer and a second carbon steel layer arranged sequentially, and the first carbon steel layer, the serpentine layer and the second carbon steel layer are sequentially wrapped around the outside of the first insulation layer. The high temperature resistant heat-insulated pipe in the present invention has good insulation effect and long service life; when applied to a molten salt reactor, due to the use of a non-active insulation method, the energy consumption is low, and it can ensure that the temperature of the concrete used on the molten salt reactor is lower than the safety limit during use.

Description

Technical Field

[0001] The invention relates to a high temperature resistant heat insulating pipeline. Background Art

[0002] The pipes used in existing pressurized water reactors are usually forced ventilation cooled because there is no passive requirement; however, this method is time-consuming and inefficient. Moreover, passive pressurized water reactors have become a hot research reactor type. In the molten salt reactor system, the cooling salt pipe and the passive residual heat exhaust duct run through the reactor compartment. The concrete used in the molten salt reactor is significantly lower than the working temperature of the high-temperature pipe, so the high-temperature pipe needs to be insulated to fully ensure the safety of the reactor and the public environment.

[0003] At present, the heat dissipation treatment method for high-temperature pipes is mostly a forced cooling method that uses a fan or pump to speed up the fluid to improve the heat dissipation effect. Although the cooling speed is fast, when the ambient temperature is too high, the heat dissipation effect of air cooling is limited. Air cooling also requires power support and has high energy consumption. Therefore, it is necessary to design a high-temperature pipe with a non-active thermal insulation method.

[0004] However, most of the high-temperature pipelines in the prior art are directly fixed rigidly to the pipeline body through metal structures or thermal insulation materials. However, the thermal conductivity of metal structures is relatively large, and the high-temperature pipelines are prone to conduct heat to the pipeline body, resulting in heat loss of the high-temperature pipelines; the thermal insulation material is relatively soft and cannot be stably fixed to the pipeline body. When the pipeline vibrates violently, it is easy to deform or even damage, resulting in a short service life.

[0005] Therefore, there is an urgent need to provide a high-temperature resistant insulated pipe with a non-active insulation method, good thermal insulation effect and long service life. Summary of the invention

[0006] The problem to be solved by the present invention is to overcome the defects of poor insulation effect or short service life of high-temperature insulated pipes, and provide a high-temperature resistant insulated pipe. Compared with the prior art, the high-temperature resistant insulated pipe of the present invention has good insulation effect and long service life; when applied to a molten salt reactor, due to the use of a passive insulation method, the energy consumption is low, and it can ensure that the temperature of the concrete used on the molten salt reactor is lower than the safety limit during use.

[0007] The present invention solves the above technical problems through the following technical solutions:

[0008] The present invention provides a high temperature resistant heat-insulated pipeline, which comprises a pipeline body, a first heat-insulating layer and a second heat-insulating layer;

[0009] The first thermal insulation layer and the second thermal insulation layer are sequentially wrapped around the outside of the pipe body;

[0010] The pipeline body is divided into a first section, a second section and a third section in sequence along the flow direction of the fluid inside the pipeline body; the second thermal insulation layer is arranged in the second section and the third section;

[0011] The second insulation layer arranged in the third section includes a first carbon steel layer, a serpentine layer and a second carbon steel layer arranged in sequence, and the first carbon steel layer, the serpentine layer and the second carbon steel layer are wrapped in sequence on the outside of the first insulation layer.

[0012] In the present invention, preferably, a carbon steel plate is provided at one end of the second thermal insulation layer of the third section away from the first section of the pipeline body.

[0013] The shape of the carbon steel plate is preferably annular. When the shape of the carbon steel plate is annular, the inner diameter of the carbon steel plate may be equal to the outer diameter of the first insulation layer; the outer diameter of the carbon steel plate may be greater than the outer diameter of the second insulation layer disposed in the third section. The length of the carbon steel plate along the axial direction of the pipeline body may be a conventional carbon steel plate length in the art, such as 10 to 20 mm, preferably 20 mm.

[0014] In the present invention, the length of the pipe body is preferably the sum of the lengths of the carbon steel plate, the first section, the second section and the third section along the axial direction of the pipe body.

[0015] In the present invention, the diameter of the pipe body may be less than 200 mm, preferably 167.3 mm.

[0016] The fluid flowing inside the pipe body may be a conventional fluid in the art; preferably a fluid at 600° C. to 700° C., such as molten salt and / or gas.

[0017] The flow direction of the fluid may be from the first section to the second section, and then from the second section to the third section.

[0018] In the present invention, the length of the first thermal insulation layer is preferably equal to the length of the pipe body.

[0019] The first thermal insulation layer may be a conventional thermal insulation material in the art, preferably a thermal insulation material with a thermal conductivity of less than 0.05 W / (m·K), such as nanofiber or aerogel.

[0020] The thickness of the first thermal insulation layer can be selected according to actual needs, preferably less than 200 mm. For example, the thickness of the first thermal insulation layer can be a conventional thickness in the art, generally 100 to 200 mm, preferably 116.5 mm.

[0021] The nanofibers may be conventional nanofibers in the art. Those skilled in the art should know that the nanofibers generally refer to nanomaterials produced based on the nanoporous heat insulation principle, such as titanium silicate nanofibers or aluminum silicate nanofibers.

[0022] The aerogel, as those skilled in the art should know, generally refers to a gel with a spatial network structure filled with gas medium and a solid appearance. The aerogel may be a conventional aerogel in the art; preferably one or more of gelatin, gum arabic and silica gel.

[0023] In the present invention, preferably, the second thermal insulation layer is vertically disposed in the second section and the third section.

[0024] The second thermal insulation layer arranged in the second section may be a conventional thermal insulation material in the art, preferably a thermal insulation material with a thermal conductivity of less than 0.05 W / (m·K), such as nanofiber or aerogel.

[0025] The thickness of the second insulation layer provided in the second section can be a conventional thickness in the art, and technicians in this field can choose it according to actual needs. It is preferably less than or equal to the thickness of the second insulation layer provided in the second section; more preferably less than 400 mm; for example, 200-400 mm, and another example is 300 mm.

[0026] The thickness of the first carbon steel layer, the serpentine layer or the second carbon steel layer in the second insulation layer of the third section may be conventional thickness in the art, such as 90 to 150 mm, preferably 100 mm.

[0027] The carbon steel of the first carbon steel layer or the second carbon steel layer may be conventional carbon steel available on the market in the art.

[0028] The serpentine in the serpentine layer may be conventional serpentine in the art. Those skilled in the art should know that the serpentine generally refers to a hydrous magnesium-rich silicate mineral. The density of the serpentine may be 2.44 to 2.80 g / cm 3 , preferably 2.57 g / cm 3 The Mohs hardness of the serpentine may be 2.5-4.

[0029] In the present invention, the shape of the first thermal insulation layer, the second thermal insulation layer, the first carbon steel layer, the serpentine layer or the second carbon steel layer may be a conventional shape in the art, preferably a ring shape.

[0030] In the present invention, those skilled in the art may select the second insulation layer provided in the third section according to actual conditions. For example, considering the temperature requirements, the second insulation layer provided in the third section may also include one or more of a nanofiber layer, a carbon steel layer, a serpentine layer and an aerogel layer.

[0031] In the present invention, preferably, the pipeline body and the first thermal insulation layer are vertically penetrated through a first section structure, a second section structure and a third section structure which are sequentially arranged along a flow direction of the fluid inside the pipeline body.

[0032] The shape of the first section structure, the second section structure or the third section structure may be a conventional shape in the art, preferably a ring-shaped shape.

[0033] The length of the first section structure along the axial direction of the pipe body may be 0.9 to 1.5 m, preferably 1 m.

[0034] The length of the second section structure along the axial direction of the pipe body may be 0.5-1.0 m, preferably 0.6 m.

[0035] The length of the third section structure along the axial direction of the pipe body may be 0.9 to 1.5 m, preferably 1.1 m.

[0036] The first section structure may be a heat insulation layer section. The heat insulation layer section may be a conventional heat insulation material in the art, such as aluminum silicate fiber.

[0037] The second section structure may be a serpentine section. The serpentine in the serpentine section is as described above.

[0038] The third section structure may be a concrete section. The concrete of the concrete section may be conventional concrete in the art.

[0039] On the basis of being in accordance with the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the present invention.

[0040] The reagents and raw materials used in the present invention are commercially available.

[0041] The positive and progressive effects of the present invention are:

[0042] (1) The high temperature resistant heat-insulated pipe of the present invention does not require forced cooling, and has low energy consumption;

[0043] (2) The high temperature resistant heat insulation pipe of the present invention has good heat preservation effect and long service life;

[0044] (3) When the high temperature resistant insulated pipe of the present invention is applied to a molten salt reactor, the temperature of the concrete used in the molten salt reactor during use is significantly lower than the working temperature of the high temperature pipe. Taking the TMSR-SF1 molten salt reactor as an example, the maximum temperature of the concrete in the reactor compartment is 67°C, which is lower than the safety limit (70°C). BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a cross-sectional view of the high-temperature resistant heat-insulated pipeline of the molten salt reactor in Example 1 of the present invention along the axial direction of the pipeline body.

[0046] Figure 2 It is a cross-sectional view of the concrete section of the high-temperature resistant and heat-insulated pipeline of the molten salt reactor in Example 1 of the present invention along the radial cross-section of the pipeline body.

[0047] Figure 3 It is a cross-sectional view of the serpentine section of the high-temperature resistant heat-insulated pipeline of the molten salt reactor in Example 1 of the present invention along the radial cross-section of the pipeline body.

[0048] Figure 4 It is a cross-sectional view of the insulation layer section of the high-temperature resistant insulation pipeline of the molten salt reactor in Example 1 of the present invention along the radial cross-section of the pipeline body.

[0049] Description of Reference Numerals

[0050] Insulation layer section 1

[0051] Serpentine Segment 2

[0052] Concrete segment 3

[0053] Pipe body 4

[0054] First insulation layer 91

[0055] Second insulation layer 92

[0056] First carbon steel layer 5

[0057] Serpentine layer 6

[0058] Second carbon steel layer 7

[0059] Carbon steel plate 8 DETAILED DESCRIPTION

[0060] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples. The experimental methods in the following examples without specifying specific conditions are carried out according to conventional methods and conditions, or selected according to the product specifications.

[0061] Example 1

[0062] In embodiment 1, the high temperature resistant heat insulation pipeline of a molten salt reactor comprises: a pipeline body (4), a first heat insulation layer (91) and a second heat insulation layer (92);

[0063] A first thermal insulation layer (91) and a second thermal insulation layer (92) are sequentially wrapped around the outer side of the pipe body (4);

[0064] The pipeline body (4) is divided into a first section, a second section and a third section in sequence along the flow direction of the fluid inside the pipeline body (4); the second thermal insulation layer (92) is arranged in the second section and the third section;

[0065] The second thermal insulation layer (92) arranged in the third section includes a first carbon steel layer (5), a serpentine layer (6) and a second carbon steel layer (7) arranged in sequence, and the first carbon steel layer (5), the serpentine layer (6) and the second carbon steel layer (7) are sequentially wrapped around the outer side of the first thermal insulation layer (91).

[0066] A carbon steel plate (8) is provided at one end of the second thermal insulation layer (92) arranged in the third section away from the first section of the pipeline body (4).

[0067] The carbon steel plate (8) is in the shape of a ring. The inner diameter of the carbon steel plate (8) is equal to the outer diameter of the first thermal insulation layer (91); the outer diameter of the carbon steel plate (8) is greater than the outer diameter of the second thermal insulation layer (92) arranged in the third section. The length of the carbon steel plate (8) along the axial direction of the pipeline body (4) is 20 mm.

[0068] The length of the pipeline body (4) is the sum of the lengths of the carbon steel plate (8), the first section, the second section and the third section along the axial direction of the pipeline body (4).

[0069] The diameter of the pipe body (4) is 167.3 mm.

[0070] The fluids flowing inside the pipeline body (4) are high-temperature molten salt and high-temperature gas, wherein the temperature of the molten salt and the gas is 650°C.

[0071] The flow direction of the molten salt and the gas is from the first section to the second section, and then from the second section to the third section.

[0072] The length of the first thermal insulation layer (91) is equal to the length of the pipeline body (4).

[0073] The thickness of the first thermal insulation layer (91) is 116.5 mm.

[0074] The first thermal insulation layer (91) is titanium silicate nanofibers having a thermal conductivity of less than 0.05 W / (m·K).

[0075] The second thermal insulation layer (92) is vertically arranged through the second section and the third section which are arranged in sequence.

[0076] The second thermal insulation layer (92) arranged in the second section is titanium silicate nanofiber with a thermal conductivity of less than 0.05 W / (m·K).

[0077] The thickness of the second thermal insulation layer (92) arranged in the second section is 300 mm.

[0078] The thickness of the second thermal insulation layer (92) arranged in the third section is equal to the thickness of the second thermal insulation layer (92) arranged in the second section.

[0079] The thickness of the first carbon steel layer (5), the serpentine layer (6) and the second carbon steel layer (7) arranged in the second thermal insulation layer (92) of the third section are all 100 mm.

[0080] The carbon steels of the first carbon steel layer (5) and the second carbon steel layer (7) are both commercially available carbon steels. The density of the serpentine in the serpentine layer (6) is 2.57 g / cm 3 ; Mohs hardness is 2.5~4.

[0081] The first thermal insulation layer (91), the second thermal insulation layer (92), the first carbon steel layer (5), the serpentine layer (6) and the second carbon steel layer (7) are all annular in shape.

[0082] The pipeline body (4) and the first thermal insulation layer (91) are vertically arranged through a first section structure, a second section structure and a third section structure which are arranged in sequence along the flow direction of the fluid inside the pipeline body (4).

[0083] The first section structure, the second section structure and the third section structure are all ring-shaped.

[0084] The length of the first section structure along the axial direction of the pipe body is 1m. The length of the second section structure along the axial direction of the pipe body is 0.6m. The length of the third section structure along the axial direction of the pipe body is 1.1m.

[0085] The first section structure is a heat insulation section (1), and the heat insulation section (1) is aluminum silicate fiber. The second section structure is a serpentine section (2). The third section structure is a concrete section (3).

[0086] In Example 1, the temperature of the concrete used in the TMSR-SF1 molten salt reactor during use is significantly lower than the working temperature of the high-temperature pipeline, and the maximum temperature of the concrete in the reactor compartment is 67°C, which is lower than the safety limit (70°C).

[0087] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A high temperature resistant heat-insulated pipeline, characterized in that: The high temperature resistant heat-insulated pipeline comprises a pipeline body, a first heat-insulating layer and a second heat-insulating layer; The first thermal insulation layer and the second thermal insulation layer are sequentially wrapped around the outside of the pipe body; The pipeline body is divided into a first section, a second section and a third section in sequence along the flow direction of the fluid inside the pipeline body; the second thermal insulation layer is arranged in the second section and the third section; The second thermal insulation layer provided in the third section includes a first carbon steel layer, a serpentine layer, and a second carbon steel layer provided in sequence, wherein the first carbon steel layer, the serpentine layer, and the second carbon steel layer are sequentially wrapped around the outer side of the first thermal insulation layer; A carbon steel plate is arranged at one end of the second insulation layer of the third section away from the first section; the carbon steel plate is annular in shape; the inner diameter of the carbon steel plate is equal to the outer diameter of the first insulation layer; the outer diameter of the carbon steel plate is greater than the outer diameter of the second insulation layer of the third section; The length of the pipe body is the sum of the lengths of the carbon steel plate, the first section, the second section and the third section along the axial direction of the pipe body; The diameter of the pipe body is less than 200 mm.

2. The high temperature resistant heat-insulated pipe according to claim 1, characterized in that: The length of the carbon steel plate along the axial direction of the pipe body is 10 to 20 mm.

3. The high temperature resistant heat insulated pipe according to claim 2, characterized in that: The length of the carbon steel plate along the axial direction of the pipe body is 20 mm.

4. The high temperature resistant heat-insulated pipe according to claim 1, characterized in that: The diameter of the pipe body is 167.3 mm.

5. The high temperature resistant heat-insulated pipe according to claim 1, characterized in that: The fluid flowing inside the pipeline body is a fluid at 600°C to 700°C.

6. The high temperature resistant heat insulated pipe according to claim 5, characterized in that: The fluid flowing inside the pipeline body is molten salt and / or gas.

7. The high temperature resistant heat insulated pipe according to claim 1, characterized in that: The thickness of the first thermal insulation layer is less than 200 mm.

8. The high temperature resistant heat insulated pipe according to claim 7, characterized in that: The thickness of the first thermal insulation layer is 100-200 mm.

9. The high temperature resistant heat insulated pipe according to claim 8, characterized in that: The thickness of the first thermal insulation layer is 116.5 mm.

10. The high temperature resistant heat insulated pipe according to claim 9, characterized in that: The first thermal insulation layer is a thermal insulation material with a thermal conductivity of less than 0.05 W / (m·K).

11. The high temperature resistant heat insulated pipe according to claim 10, characterized in that: The first thermal insulation layer is nanofiber or aerogel.

12. The high temperature resistant heat-insulated pipe according to claim 11, characterized in that: The aerogel is one or more of gelatin, gum arabic and silica gel.

13. The high temperature resistant heat insulated pipe according to claim 1, characterized in that: The second thermal insulation layer is vertically arranged through the second section and the third section; And / or, the thickness of the first carbon steel layer, the serpentine layer or the second carbon steel layer arranged in the second thermal insulation layer of the third section is 90 to 150 mm.

14. The high temperature resistant heat-insulated pipe according to claim 13, characterized in that: The second thermal insulation layer arranged in the second section is a thermal insulation material with a thermal conductivity coefficient less than 0.05 W / (m·K).

15. The high temperature resistant heat insulated pipe according to claim 14, characterized in that: The second thermal insulation layer arranged in the second section is nanofiber or aerogel.

16. The high temperature resistant heat insulated pipe according to claim 15, characterized in that: The thickness of the second thermal insulation layer provided in the second section is less than 400 mm.

17. The high temperature resistant heat insulated pipe according to claim 16, characterized in that: The thickness of the second thermal insulation layer arranged in the second section is 200-400 mm.

18. The high temperature resistant heat insulated pipe according to claim 17, characterized in that: The thickness of the second thermal insulation layer arranged in the second section is 300 mm.

19. The high temperature resistant heat insulated pipe according to claim 13, characterized in that: The thickness of the first carbon steel layer, the serpentine layer or the second carbon steel layer arranged in the second thermal insulation layer of the third section is 100 mm.

20. The high temperature resistant heat insulated pipe according to claim 13, characterized in that: The density of serpentine in the serpentine layer is 2.44-2.80 g / cm 3 .

21. The high temperature resistant heat insulated pipe according to claim 20, characterized in that: The density of serpentine in the serpentine layer is 2.57 g / cm 3 .

22. The high temperature resistant heat insulated pipe according to claim 13, characterized in that: The Mohs hardness of the serpentine is 2.5-4.

23. The high temperature resistant heat insulated pipe according to claim 1, characterized in that: The first thermal insulation layer, the second thermal insulation layer, the first carbon steel layer, the serpentine layer or the second carbon steel layer is in a ring shape.

24. The high temperature resistant heat insulated pipe according to claim 1, characterized in that: The second thermal insulation layer disposed in the third section includes one or more of a nanofiber layer, a carbon steel layer, a serpentine layer and an aerogel layer.

25. The high temperature resistant heat insulated pipe according to claim 1, characterized in that: The pipeline body and the first heat-insulating layer are vertically arranged through a first section structure, a second section structure and a third section structure which are arranged in sequence along the flow direction of the fluid inside the pipeline body.

26. The high temperature resistant heat insulated pipe according to claim 25, characterized in that: The first section structure, the second section structure or the third section structure is in a ring shape.

27. The high temperature resistant heat insulated pipe according to claim 25, characterized in that: The length of the first section structure along the axial direction of the pipeline body is 0.9 to 1.5 m; and / or, the length of the second section structure along the axial direction of the pipeline body is 0.5 to 1.0 m; And / or, the length of the third section structure along the axial direction of the pipeline body is 0.9-1.5 m.

28. The high temperature resistant heat insulated pipe according to claim 27, characterized in that: The length of the first section structure along the axial direction of the pipeline body is 1m; and / or, the length of the second section structure along the axial direction of the pipeline body is 0.6 m; And / or, the length of the third section structure along the axial direction of the pipe body is 1.1 m.

29. The high temperature resistant heat insulated pipe according to any one of claims 25 to 28, characterized in that: The first section structure is a heat insulation layer section; and / or, the second segment structure is a serpentine segment; And / or, the third section structure is a concrete section.

30. The high temperature resistant heat insulated pipe according to claim 29, characterized in that: The material of the heat insulation layer section is aluminum silicate fiber.

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