A pipeline thermal insulation and anti-corrosion system

Abstract

The present invention relates to a pipeline heat insulation, corrosion prevention system, including a straight pipe heat insulation and corrosion prevention structure, a valve heat insulation and corrosion prevention structure, and an elbow heat insulation and corrosion prevention structure. The straight pipe heat insulation and corrosion prevention structure and the elbow heat insulation and corrosion prevention structure both include an inner heat insulation layer, an outer heat insulation layer, and a metal outer protection layer that are sequentially coated from the inside to the outside. The inner heat insulation layers of the straight pipe heat insulation and corrosion prevention structure and the elbow heat insulation and corrosion prevention structure are both aerogel blanket materials; the valve heat insulation and corrosion prevention structure includes a valve stem inner heat insulation layer and a valve stem intermediate layer that are sequentially coated outside the valve stem, a valve body inner heat insulation layer and a valve body intermediate layer that are sequentially coated outside the valve body, and a prefabricated aerogel blanket insulation block for the straight pipe section flange coated outside the flange of the valve straight pipe section; both the valve stem inner heat insulation layer and the valve body inner heat insulation layer are made of aerogel blanket materials. Compared with the prior art, the surface of the pipeline of the present invention can always be dry and there will be no corrosion phenomenon, so that the service life of the pipeline is much longer than that of conventional heat insulation materials.

Description

Technical Field

[0001] The present invention relates to the technical field of petrochemical pipelines, and in particular to a pipeline heat insulation, corrosion prevention and insulation system. Background Art

[0002] Petrochemical industry is a basic industry. It provides support and services for industries such as agriculture, energy, transportation, machinery, electronics, textile, light industry, construction, building materials, etc. and people's daily life, and occupies a crucial position in the national economy. Petroleum products, also known as oil products, mainly include various fuel oils, lubricating oils, liquefied petroleum gas, petroleum coke, paraffin wax, asphalt, etc. The processing process for producing these products is often referred to as petroleum refining, abbreviated as oil refining. Petrochemical products are obtained by further chemical processing of the feedstock oil provided by the refining process. Pipeline transportation has the advantages of large transportation volume, continuity, rapidity, economy, safety, reliability, stability, less investment, less land occupation, low cost, and can achieve automatic control, and has become an important transportation tool for petroleum and liquid chemical raw materials. However, the anti-corrosion and heat insulation of petrochemical pipelines have always been a difficult problem to deal with.

[0003] The anti-corrosion and heat insulation technology of pipelines is an important measure to ensure the safe operation of pipelines. Once problems occur in the anti-corrosion and heat insulation work of pipelines, it will cause problems in pipeline transportation, affect the economic benefits of enterprises, and bring huge losses to enterprises. The anti-corrosion and heat insulation technology of pipelines should be improved in terms of economy on the basis of safety and reliability.

[0004] The invention with the publication number of CN107606329A discloses a petroleum transportation pipeline with anti-corrosion function, including an inner pipeline and an outer pipeline sleeved outside the inner pipeline. A heat insulation layer and an anti-corrosion layer are sequentially arranged between the inner pipeline and the outer pipeline from inside to outside. A plurality of heat insulation pipes are arranged in the heat insulation layer, and heat insulation asbestos is filled outside the heat insulation pipes in the heat insulation layer. A zigzag partition plate is arranged in the heat insulation pipe, and the partition plate divides the heat insulation pipe into two cavities. The cavity close to the inner pipeline is filled with foam, and the cavity far from the inner pipeline is filled with desiccant; A plurality of drainage rings are sequentially arranged on the outer wall above the outer pipeline. The petroleum pipeline of the present invention, through a special structure, enables the pipeline to have good heat insulation performance, can avoid petroleum blockage, improve the convenience of petroleum transportation, and the pipeline omits the asphalt layer and adopts lightweight heat insulation materials, greatly reducing the quality, reducing the pipeline burden, enhancing the stability of the petroleum pipeline structure, and having an anti-corrosion layer, greatly improving the anti-corrosion performance of the pipeline.

[0005] Although the anti-corrosion effect is achieved on the outside by setting silicon nitride on the outermost side of the pipeline in this solution, the inner heat insulation layer is impermeable to water vapor, and water vapor is sealed inside the heat insulation layer for a long time, and a large amount of corrosion still appears on the pipeline surface, reducing the service life of the pipeline. Summary of the Invention

[0006] The object of the present invention is to overcome the defects of the above-mentioned existing technologies and provide a pipeline thermal insulation, anti-corrosion system, which can keep dry both inside and outside the thermal insulation layer and reduce the occurrence of corrosion phenomena.

[0007] The object of the present invention can be achieved by the following technical solutions:

[0008] A pipeline thermal insulation, anti-corrosion system includes a straight pipe thermal insulation, anti-corrosion structure, a valve thermal insulation, anti-corrosion structure and an elbow thermal insulation, anti-corrosion structure. The straight pipe thermal insulation, anti-corrosion structure and the elbow thermal insulation, anti-corrosion structure both include an inner thermal insulation layer, an outer thermal insulation layer and a metal outer sheath which are sequentially coated from the inside to the outside. The inner thermal insulation layers of the straight pipe thermal insulation, anti-corrosion structure and the elbow thermal insulation, anti-corrosion structure are both made of aerogel blanket materials;

[0009] The valve thermal insulation, anti-corrosion structure includes a valve stem inner thermal insulation layer and a valve stem intermediate layer which are sequentially coated outside the valve stem, a valve body inner thermal insulation layer and a valve body intermediate layer which are sequentially coated outside the valve body, a prefabricated aerogel blanket insulation block for the straight pipe section flange coated outside the flange of the valve straight pipe section, and a metal outer sheath located on the outermost side of the entire valve thermal insulation, anti-corrosion structure;

[0010] The valve stem inner thermal insulation layer includes a prefabricated circular perforated aerogel blanket insulation block and a valve stem inner layer aerogel blanket insulation block which are covered outside the valve stem. The prefabricated circular perforated aerogel blanket insulation block also connects one end of the valve stem inner layer aerogel blanket insulation block. The valve body inner thermal insulation layer includes a valve body inner layer aerogel blanket insulation block which is coated outside the valve body.

[0011] Further, the outer thermal insulation layer of the straight pipe thermal insulation, anti-corrosion structure is made of glass wool or rock wool materials. A waterproof and breathable membrane is arranged outside the outer thermal insulation layer of the straight pipe thermal insulation, anti-corrosion structure, and the metal outer sheath is coated outside the waterproof and breathable membrane.

[0012] Further, the outer thermal insulation layer of the straight pipe thermal insulation, anti-corrosion structure is made of aerogel blanket materials.

[0013] Further, the outer thermal insulation layer of the elbow thermal insulation, anti-corrosion structure is made of glass wool or rock wool materials. A waterproof and breathable membrane is arranged outside the outer thermal insulation layer of the elbow thermal insulation, anti-corrosion structure, and the metal outer sheath is coated outside the waterproof and breathable membrane.

[0014] Further, the outer thermal insulation layer of the elbow thermal insulation, anti-corrosion structure is made of aerogel blanket materials.

[0015] Further, the valve stem intermediate layer is made of glass wool or rock wool materials. A waterproof and breathable membrane is arranged outside the valve stem intermediate layer, and the metal outer sheath is coated outside the waterproof and breathable membrane.

[0016] Further, the valve stem intermediate layer is made of aerogel blanket materials.

[0017] Furthermore, the middle layer of the valve body is made of glass wool or rock wool material. A waterproof and breathable membrane is arranged outside the middle layer of the valve body, and the metal outer protection is coated outside the waterproof and breathable membrane.

[0018] Furthermore, the middle layer of the valve body is made of aerogel blanket material.

[0019] Furthermore, in the valve heat preservation and anti-corrosion structure, the metal outer protection located outside the flange of the straight pipe section of the valve is fixed by a binding belt.

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

[0021] (1) The heat preservation performance of the aerogel blanket is far superior to that of traditional polyurethane and other heat preservation materials. Using the aerogel blanket as the heat preservation material for petrochemical pipelines can greatly reduce the heat loss of the pipelines and has good energy-saving benefits.

[0022] Since traditional heat preservation materials are impermeable to water vapor, water vapor is confined inside the heat preservation layer for a long time, and a large number of corrosion phenomena appear on the pipeline surface, greatly shortening the service life of the pipeline. For the inner layer heat preservation of petrochemical pipelines, valves, elbows, etc., the aerogel blanket is used for heat preservation, and the water vapor inside the inner layer will penetrate through the aerogel blanket and be released. In addition, since the aerogel blanket material does not absorb water, the water outside the heat preservation layer will not enter, so the pipeline surface is always dry and no corrosion phenomenon will occur. The service life of the pipeline adopting this scheme is much longer than that of conventional heat preservation materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of a pipeline heat insulation, anti-corrosion and heat preservation system provided in an embodiment of the present invention;

[0024] Figure 2 It is a schematic diagram of the inner layer structure of a valve heat preservation and anti-corrosion structure provided in an embodiment of the present invention;

[0025] Figure 3 It is a schematic diagram of the middle layer structure of a valve heat preservation and anti-corrosion structure provided in an embodiment of the present invention;

[0026] Figure 4 It is a schematic diagram of the overall structure of a valve heat preservation and anti-corrosion structure provided in an embodiment of the present invention;

[0027] In the figure, 1 is a steel pipe, 2 is a bracket, 3 is a valve, 4 is a binding band, 5 is an outer thermal insulation layer, 6 is an inner thermal insulation layer, 7 is a metal outer protection, 8 is a valve handle, 9 is a valve stem, 10 is a prefabricated circular perforated aerogel block, 11 is a straight pipe section flange prefabricated aerogel blanket insulation block, 12 is a valve stem inner layer aerogel blanket insulation block, 13 is a valve body inner layer aerogel blanket insulation block, 14 is a valve stem outer layer prefabricated glass wool, 15 is a valve body outer layer prefabricated glass wool, 16 is an elbow inner layer prefabricated aerogel blanket, and 17 is a waterproof and breathable membrane. Detailed implementation mode

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0030] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0031] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention 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 should not be construed as a limitation of the present invention.

[0032] It should be noted that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more, unless otherwise specifically defined.

[0033] In addition, terms such as "horizontal" and "vertical" do not require the components to be absolutely horizontal or hanging vertically, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0034] Embodiment 1

[0035] As Figure 1 shown, this embodiment provides a pipeline heat insulation, anti-corrosion system, including a straight pipe heat insulation and anti-corrosion structure, a valve heat insulation and anti-corrosion structure, and an elbow heat insulation and anti-corrosion structure. The straight pipe heat insulation and anti-corrosion structure and the elbow heat insulation and anti-corrosion structure both include an inner heat insulation layer, an outer heat insulation layer 5, and a metal outer protection 7 that are sequentially coated from the inside to the outside. The inner heat insulation layers of the straight pipe heat insulation and anti-corrosion structure and the elbow heat insulation and anti-corrosion structure are both aerogel blanket materials;

[0036] The valve heat insulation and anti-corrosion structure includes a valve stem inner heat insulation layer and a valve stem intermediate layer that are sequentially coated outside the valve stem, a valve body inner heat insulation layer and a valve body intermediate layer that are sequentially coated outside the valve body, a prefabricated aerogel blanket insulation block 11 for the straight pipe section flange coated outside the flange of the valve straight pipe section, and a metal outer protection 7 located on the outermost side of the entire valve heat insulation and anti-corrosion structure;

[0037] The valve stem inner heat insulation layer includes a prefabricated circular perforated aerogel blanket insulation block 10 and a valve stem inner layer aerogel blanket insulation block 12 that are covered outside the valve stem. The prefabricated circular perforated aerogel blanket insulation block 10 also connects one end of the valve stem inner layer aerogel blanket insulation block 12. The valve body inner heat insulation layer includes a valve body inner layer aerogel blanket insulation block 13 that is coated outside the valve body.

[0038] The straight pipe heat insulation and anti-corrosion structure and the elbow heat insulation and anti-corrosion structure are both coated outside the steel pipe 1, and the valve heat insulation and anti-corrosion structure is coated outside the valve 3.

[0039] In the entire petrochemical pipeline heat insulation, anti-corrosion system, the number of the straight pipe heat insulation and anti-corrosion structure, the valve heat insulation and anti-corrosion structure, and the elbow heat insulation and anti-corrosion structure is one or more. The number of the valves 3 corresponds to the number of the valve heat insulation and anti-corrosion structures. The straight pipe heat insulation and anti-corrosion structure and the elbow heat insulation and anti-corrosion structure are fixed by one or more brackets 2.

[0040] The outer heat insulation layer 5 of the straight pipe heat insulation and anti-corrosion structure is made of glass wool or rock wool material. A waterproof and breathable membrane 17 is arranged outside the outer heat insulation layer 5 of the straight pipe heat insulation and anti-corrosion structure, and the metal outer protection 7 is coated outside the waterproof and breathable membrane 17. Alternatively, the outer heat insulation layer 5 of the straight pipe heat insulation and anti-corrosion structure is made of aerogel blanket material, and its outer layer does not need to be provided with a waterproof and breathable membrane 17.

[0041] The outer insulation layer 5 of the elbow thermal insulation and anti-corrosion structure is made of glass wool or rock wool, a waterproof and breathable membrane 17 is arranged on the outer side of the outer insulation layer 5 of the elbow thermal insulation and anti-corrosion structure, and the metal outer sheath 7 is coated on the outer side of the waterproof and breathable membrane 17. Alternatively, the outer insulation layer 5 of the elbow thermal insulation and anti-corrosion structure is made of aerogel blanket material, and the outer layer thereof does not need to be provided with a waterproof and breathable membrane 17.

[0042] The valve stem middle layer is made of glass wool or rock wool, and a waterproof breathable membrane 17 is arranged on the outer side of the valve stem middle layer, and the metal outer sheath 7 is coated on the outer side of the waterproof breathable membrane 17. Alternatively, the valve stem middle layer is made of aerogel blanket material, and the outer layer does not need to be provided with a waterproof breathable membrane 17.

[0043] The valve body middle layer is made of glass wool or rock wool, a waterproof breathable membrane 17 is arranged outside the valve body middle layer, and the metal outer protection 7 is coated on the outside of the waterproof breathable membrane 17. Alternatively, the valve body middle layer is made of aerogel blanket material, and the outer layer does not need to be provided with a waterproof breathable membrane 17.

[0044] The metal outer protection 7 can be made of stainless steel sheet or aluminum sheet. The metal outer protection 7 located outside the flange of the valve straight pipe section in the valve thermal insulation and corrosion protection structure is fixed by a binding belt 4.

[0045] As an optional implementation, in this implementation, both the valve stem middle layer and the valve body middle layer are made of glass wool material, that is, a valve stem outer layer prefabricated glass wool 14 and a valve body outer layer prefabricated glass wool 15 are provided.

[0046] like Figures 1-4 As shown, in this embodiment, the petrochemical pipeline insulation and anti-corrosion system specifically includes a steel pipe 1, a bracket 2, a valve 3, a binding belt 4, an outer insulation layer 5, an aerogel blanket 6, a metal outer protection 7, a valve handle 8, a valve stem 9, a prefabricated circular perforated aerogel blanket insulation block 10, a prefabricated aerogel blanket insulation block for a straight pipe flange 11, a valve stem inner layer aerogel blanket insulation block 12, a valve body outer layer aerogel blanket insulation block 13, a valve stem outer layer prefabricated glass wool 14, a valve body outer layer prefabricated glass wool 15, an elbow inner layer prefabricated aerogel blanket 16, and a waterproof breathable membrane 17.

[0047] The thermal insulation and anti-corrosion system of petrochemical pipelines includes straight pipeline insulation and anti-corrosion structures, valve insulation and anti-corrosion structures, and elbow insulation and anti-corrosion structures.

[0048] The inner layer of the petrochemical straight pipe insulation adopts aerogel blanket 6, and then the middle layer is wrapped with an outer insulation layer 5. The inner layer of the elbow section adopts the inner layer prefabricated aerogel blanket 16 of the elbow, and the middle layer adopts the outer insulation layer 5.

[0049] The inner insulation of each part of the valve insulation and corrosion protection structure adopts prefabricated circular perforated aerogel blanket insulation block 10, straight pipe flange prefabricated aerogel blanket insulation block 11, valve stem inner layer aerogel blanket insulation block 12, valve body inner layer aerogel blanket insulation block 13 respectively.

[0050] The middle layer of the valve stem of the valve adopts an outer thermal insulation layer 5, and the material can be thermal insulation materials such as glass wool and rock wool. The middle layer of the valve body adopts an outer thermal insulation layer 5, and the material can be thermal insulation materials such as glass wool and rock wool.

[0051] The outer layer of the straight pipeline, valve and elbow is insulated with a metal outer cover 7, and the metal outer cover can be made of stainless steel iron sheet or aluminum sheet. The metal outer cover is fixed by a binding band 4.

[0052] This solution uses aerogel blanket as the inner thermal insulation material, which plays an important role in preventing pipeline corrosion and extending the service life of the pipeline. Since traditional thermal insulation materials are impermeable to water vapor, the water vapor is confined inside the thermal insulation layer for a long time, and a large number of corrosion phenomena appear on the pipeline surface, greatly shortening the service life of the pipeline. When using aerogel blanket for thermal insulation of the inner layer of petrochemical pipelines, valves or elbows, etc., the water vapor inside the inner layer will permeate through the aerogel blanket and be released. In addition, since the aerogel blanket material does not absorb water, the water outside the thermal insulation layer will not enter, so the pipeline surface is always dry and corrosion will not occur. The service life of the pipeline using this solution is much longer than that of conventional thermal insulation materials.

[0053] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present invention without creative labor. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field according to the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art should be within the protection scope determined by the claims.

Claims

1. A pipeline thermal insulation and anti-corrosion system, comprising a straight pipe thermal insulation and anti-corrosion structure, a valve thermal insulation and anti-corrosion structure, and an elbow thermal insulation and anti-corrosion structure, characterized in that, Both the straight pipe heat preservation and anti-corrosion structure and the elbow heat preservation and anti-corrosion structure include an inner heat preservation layer (6), an outer heat preservation layer (5), and a metal outer protection (7) that are sequentially wrapped from the inside to the outside. The inner heat preservation layer (6) of both the straight pipe heat preservation and anti-corrosion structure and the elbow heat preservation and anti-corrosion structure is made of aerogel blanket material; The valve heat preservation and anti-corrosion structure includes a valve stem inner heat preservation layer and a valve stem intermediate layer that are sequentially wrapped outside the valve stem, a valve body inner heat preservation layer and a valve body intermediate layer that are sequentially wrapped outside the valve body, a prefabricated aerogel blanket heat preservation block (11) for the straight pipe section flange outside the valve flange, and a metal outer protection (7) located on the outermost side of the entire valve heat preservation and anti-corrosion structure; The valve stem inner heat preservation layer includes a prefabricated circular perforated aerogel blanket heat preservation block (10) and a valve stem inner layer aerogel blanket heat preservation block (12) that are covered outside the valve stem. The prefabricated circular perforated aerogel blanket heat preservation block (10) also connects one end of the valve stem inner layer aerogel blanket heat preservation block (12). The valve body inner heat preservation layer includes a valve body inner layer aerogel blanket heat preservation block (13) that is wrapped outside the valve body; A waterproof and breathable membrane (17) is provided on the outside of the outer heat preservation layer (5) of the straight pipe heat preservation and anti-corrosion structure, and the metal outer protection (7) is wrapped outside the waterproof and breathable membrane (17); A waterproof and breathable membrane (17) is provided on the outside of the outer heat preservation layer (5) of the elbow heat preservation and anti-corrosion structure, and the metal outer protection (7) is wrapped outside the waterproof and breathable membrane (17); A waterproof and breathable membrane (17) is provided on the outside of the valve body intermediate layer, and the metal outer protection (7) is wrapped outside the waterproof and breathable membrane (17).

2. The pipeline heat insulation, anti-corrosion system according to claim 1, characterized in that, The outer heat preservation layer (5) of the straight pipe heat preservation and anti-corrosion structure is made of glass wool or rock wool material.

3. A pipeline heat insulation and corrosion prevention system according to claim 1, characterized in that, The outer heat preservation layer (5) of the straight pipe heat preservation and anti-corrosion structure is made of aerogel blanket material.

4. A pipeline heat insulation and anti-corrosion system according to claim 1, characterized in that, The outer heat preservation layer (5) of the elbow heat preservation and anti-corrosion structure is made of glass wool or rock wool material.

5. A pipeline heat insulation, anti-corrosion system according to claim 1, characterized in that, The outer heat preservation layer (5) of the elbow heat preservation and anti-corrosion structure is made of aerogel blanket material.

6. A pipeline heat insulation and anti-corrosion system according to claim 1, characterized in that, The valve stem intermediate layer is made of glass wool or rock wool material. A waterproof and breathable membrane (17) is provided on the outside of the valve stem intermediate layer, and the metal outer protection (7) is wrapped outside the waterproof and breathable membrane (17).

7. A pipeline heat insulation and anti-corrosion system according to claim 1, characterized in that, The valve stem intermediate layer is made of aerogel blanket material.

8. A pipeline heat insulation and anti-corrosion system according to claim 1, characterized in that, The valve body intermediate layer is made of glass wool or rock wool material.

9. A pipeline heat insulation, anti-corrosion system according to claim 1, characterized in that, The valve body intermediate layer is made of aerogel blanket material.

10. A pipeline heat insulation and anti-corrosion system according to claim 1, characterized in that, In the valve heat preservation and anti-corrosion structure, the metal outer protection (7) located outside the valve flange of the valve straight pipe section is fixed by a binding band (4).

Images