CN114791068A - Prefabricated overhead composite heat-insulating pipe for conveying high-temperature heat medium and production process - Google Patents

Abstract

The invention discloses a prefabricated overhead composite heat-insulating pipe for conveying a high-temperature heat medium, which comprises a working steel pipe and an outer protective pipe, wherein a plurality of ceramic fiber pipes are sleeved on the working steel pipe, the ceramic fiber pipes are sequentially connected end to end through socket structures, a polyurethane heat-insulating layer is filled in a gap between each ceramic fiber pipe and the outer protective pipe, and a support frame is arranged in the polyurethane heat-insulating layer. The invention can obviously reduce the heat preservation thickness, and the ceramic fiber pipe is installed by adopting a socket joint type structure and uses a high-temperature resistant sealing ring, so that the ceramic fiber pipe is convenient to install and has good sealing effect; the polyurethane tightly bonds the ceramic fiber pipe heat-insulating layer and the outer protective pipe together to form a three-in-one structure, the heat-insulating layer and the outer protective pipe do not move in the operation process of the pipeline, only the working steel pipe moves, and the operation of a pipe network is more stable; the ceramic fiber tube is prepared by mixing ceramic fibers, an inorganic adhesive and water and then centrifugally drying in a mold, and has high strength and uniform wall thickness without being wrapped layer by layer.

Description

Prefabricated overhead composite heat-insulating pipe for conveying high-temperature heat medium and production process

Technical Field

The invention relates to the field of heat preservation pipes, in particular to a prefabricated overhead composite heat preservation pipe for conveying a high-temperature heat medium.

Background

The heat insulation pipeline is used for conveying other media such as liquid, gas and the like, and is widely applied to heat insulation projects such as petrochemical engineering, central heating, central air conditioning, municipal pipelines and the like. Chinese utility model patent with application number CN201520685190.5 discloses a prefabricated built on stilts steam insulation pipeline among the prior art, this insulation pipeline's heat preservation adopts inorganic and organic compound incubation, and the outer pillar adopts the galvanized tuber pipe, has solved traditional steam insulation pipeline's construction inconvenient effectively, the heat preservation effect is not good, perishable scheduling problem. When the heat preservation pipe is produced, a working steel pipe is fixed, an inorganic heat preservation layer is wrapped layer by layer to meet the design requirement, the inorganic heat preservation layer needs to be fixed on the working steel pipe by a stainless steel packing belt, but is influenced by low compression strength of traditional inorganic heat preservation materials (glass wool, aluminum silicate needled blanket and the like), and the heat preservation pipe adopting the invention has the following defects: (1) the inorganic heat-insulating layer is fixed on the working pipe in a layer-by-layer wrapping mode, and the used inorganic heat-insulating material has low compressive strength, so that the phenomenon that the inorganic heat-insulating layer is newly compressed occurs in the polyurethane pouring production process, the inorganic heat-insulating material is affected by uneven pressure to cause inconsistent compression thickness, the inconsistent thickness of the inorganic heat-insulating layer can cause an excessively compressed part of the inorganic heat-insulating layer, and the temperature-resistant range of the organic heat-insulating layer is exceeded, so that the heat insulation of the heat-insulating pipeline is failed; (2) the heat-insulating pipeline is not suitable for conveying liquid media, after the pipeline is fixed on a support, the stress part of a pipe bracket is compressed by inorganic heat-insulating materials such as glass wool, an aluminum silicate needled blanket and the like under the action of gravity, so that the heat-insulating layer fails, and even the pipeline is unstable; (3) the inorganic heat-insulating layer is directly contacted with the working steel pipe, the pipeline is influenced by thermal expansion and cold contraction in the process of conveying steam to generate displacement, the pipeline is rubbed with the inorganic heat-insulating layer, the inorganic heat-insulating layer is abraded, the heat-insulating effect is reduced due to the thinning of the heat-insulating layer, and the pipeline is unstable in severe cases; (4) polyurethane directly foams at the outer layer of the inorganic heat-insulating layer, polyurethane can enter the inner layer heat-insulating layer along the lap joint of the inorganic heat-insulating layer in the process of changing liquid state into solid state, and the polyurethane is carbonized when the temperature resistance temperature of the polyurethane is exceeded to cause the heat insulation failure of the polyurethane.

Disclosure of Invention

Based on the problems, the invention aims to provide a prefabricated overhead composite heat-insulating pipe for conveying a high-temperature heat medium, and the invention adopts the following technical scheme:

the invention provides a prefabricated overhead composite heat-insulating pipe for conveying a high-temperature heat medium, which comprises a working steel pipe and an outer protective pipe, wherein a plurality of ceramic fiber pipes are sleeved on the working steel pipe, the ceramic fiber pipes are prepared by mixing ceramic fibers, an inorganic adhesive and water and then centrifugally drying in a mold, the ceramic fiber pipes are sequentially connected together end to end through a socket structure, a polyurethane heat-insulating layer is filled in a gap between each ceramic fiber pipe and the outer protective pipe, and a support frame is arranged in the polyurethane heat-insulating layer and is abutted against the outer protective pipe and the ceramic fiber pipes.

Preferably, the socket structure comprises a socket and a spigot which are in plug-in fit, and the socket and the spigot are respectively arranged at two ends of the ceramic fiber pipe.

Preferably, a high-temperature-resistant sealing ring is arranged between the socket and the socket.

Preferably, the high-temperature-resistant sealing ring is sleeved on the socket, and the outer circular wall of the high-temperature-resistant sealing ring abuts against the inner wall of the socket.

Preferably, the outer surface of the working steel pipe is coated with an anticorrosive layer.

Preferably, the corrosion-resistant layer is wound with an aluminum foil layer, and one surface of the aluminum foil layer containing the aluminum foil faces outwards.

Preferably, the outer wall of the outer protecting pipe is provided with a polyurethane injection hole, and the polyurethane injection hole is sealed by hot melting plugging at the later stage.

Preferably, the outer protecting pipe is a galvanized air pipe.

The invention provides a production process of a prefabricated overhead composite heat-insulating pipe for conveying a high-temperature heat medium, which comprises the following steps of:

step one, performing shot blasting rust removal treatment on a working steel pipe;

spraying anticorrosive paint on the work steel pipe subjected to shot blasting to remove rust, wherein the anticorrosive paint forms an anticorrosive layer on the outer surface of the work steel pipe;

step three, winding an aluminum foil layer after the anticorrosive layer is dried, wherein one surface of the aluminum foil layer containing the aluminum foil faces outwards;

sleeving the ceramic fiber pipes on the working steel pipes, reserving sections of 20-30 cm at two ends of each working steel pipe, connecting two adjacent ceramic fiber pipes through sockets and sockets, and sleeving the sockets with high-temperature-resistant sealing rings;

fixing a support frame on the outer surface of the ceramic fiber pipe;

welding temporary limiting protection plates at two ends of the working steel pipe, wherein the limiting protection plates abut against the ceramic fiber pipe to prevent the ceramic fiber pipe from moving axially;

seventhly, sleeving an outer protection pipe outside the ceramic fiber pipe, forming a polyurethane injection hole in the middle of the outer protection pipe, injecting foamed polyurethane into a gap between the ceramic fiber pipe and the outer protection pipe through the polyurethane injection hole, and sealing the polyurethane injection hole through hot melting plugging at the later stage.

Compared with the prior art, the invention has the following beneficial technical effects:

the prefabricated overhead composite heat-insulating pipe can obviously reduce the heat-insulating thickness; the aluminum foil layer is wound outside the working steel pipe, so that the friction coefficient between the pipeline and the heat insulation layer can be reduced, and the pipeline can slide more fully; the ceramic fiber pipe is installed by adopting a socket type structure and a high-temperature-resistant sealing ring is used, so that the ceramic fiber pipe is convenient to install and good in sealing effect; the polyurethane tightly bonds the ceramic fiber pipe heat-insulating layer and the outer protective pipe together to form a three-in-one structure, the heat-insulating layer and the outer protective pipe do not move in the operation process of the pipeline, only the working steel pipe moves, and the operation of a pipe network is more stable; the ceramic fiber tube is prepared by mixing ceramic fiber, inorganic adhesive and water and then centrifugally drying in a die, can achieve the designed thickness at one time, and has uniform thickness and high structural strength; the ceramic fiber pipe adopts a socket joint type connecting structure, and does not need to be wrapped layer by layer, so that the production process is simpler.

Drawings

The invention is further illustrated in the following description with reference to the drawings.

Fig. 1 is a schematic structural diagram of a prefabricated overhead composite heat-insulating pipe for conveying a high-temperature heat medium.

FIG. 2 is a schematic view of a socket structure of two adjacent ceramic fiber pipes according to the present invention;

FIG. 3 is a schematic view showing the circumferential arrangement of the supporting frame on the outer wall of the ceramic fiber tube.

Description of the reference numerals: 1. working steel pipes; 2. an outer protecting pipe; 3. a ceramic fiber tube; 4. a socket structure; 401. a socket; 402. a socket; 403. a high temperature resistant seal ring; 5. a polyurethane heat-insulating layer; 6. a support frame; 7. an anticorrosive layer; 8. an aluminum foil layer; 9. a polyurethane injection hole; 10. hot melting and plugging; 11. and a limiting protection plate.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. The meaning of "a number" is one or more unless specifically limited otherwise.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

As shown in fig. 1, the embodiment discloses a prefabricated built on stilts compound incubation pipe for carrying high temperature heat medium, including work steel pipe 1 and outer pillar 2, the cover is equipped with a plurality of ceramic fiber pipes 3 on the work steel pipe 1, all links together end to end in proper order through socket joint structure 4 between each ceramic fiber pipe 3, fills in the clearance between ceramic fiber pipe 3 and the outer pillar 2 by polyurethane heat preservation 5, is provided with support frame 6 in the polyurethane heat preservation 5, and support frame 6 supports on outer pillar 2 and ceramic fiber pipe 3. In this embodiment, the outer protection pipe 2 is a galvanized air pipe.

As a possible way of implementation, as shown in fig. 2, in the present embodiment, the socket structure 4 includes a socket 401 and a spigot 402 which are inserted and matched, and the socket 401 and the spigot 402 are respectively integrally formed at both ends of the ceramic fiber tube 3. The inner diameter of the spigot 402 is the same as that of the ceramic fiber pipe 3, the outer diameter of the bell 401 is the same as that of the ceramic fiber pipe 3, the bell 401 and the spigot 402 are both step-shaped, and the outer wall and the inner wall of each ceramic fiber pipe 3 which are inserted together are in flush transition at the position of the inserting structure 4.

In order to increase the tightness of the socket structure 4, a high-temperature-resistant sealing ring 403 is arranged between the socket 401 and the spigot 402. In this embodiment, the high temperature-resistant sealing ring 403 is sleeved on the socket 402, and an outer circular wall of the high temperature-resistant sealing ring 403 abuts against an inner wall of the socket 401. When installing high temperature resistant sealing washer 403, need be offering the mounting groove to carry out axial spacing to high temperature resistant sealing washer 403, in this embodiment, be provided with on the outer wall of socket 402 with high temperature resistant sealing washer complex mounting groove, in addition can also set up the mounting groove on the inner wall of bellmouth 401.

In addition to this embodiment, a high-temperature-resistant seal ring 403 may be provided on the end surface where the socket 401 and the spigot 402 contact.

In this embodiment, in order to improve the corrosion resistance of the working steel pipe 1, the outer surface of the working steel pipe 1 may be coated with a corrosion-resistant layer 7.

The displacement can take place for the influence of expend with heat and contract with cold of work steel pipe 1, and the pipeline takes place the friction with ceramic fiber pipe 3, will arouse that ceramic fiber pipe 3 weares and teares, takes place for avoiding this kind of condition, can twine on anticorrosive coating 7 has aluminium foil layer 8, and aluminium foil layer 8 contains the one side of aluminium foil outwards.

In this embodiment, the outer wall of the outer sheath 2 is provided with a polyurethane injection hole 9, and the polyurethane injection hole 9 is sealed by a hot-melt plug 10 at a later stage. The polyurethane injection hole 9 may be opened at a middle position of the outer sheath 2 in consideration of the uniformity of polyurethane injection.

The embodiment also discloses a production process of the prefabricated overhead composite heat-insulating pipe for conveying the high-temperature heat medium, which specifically comprises the following steps of:

performing shot blasting and rust removing treatment on a working steel pipe 1;

step two, spraying an anticorrosive paint on the work steel pipe 1 after shot blasting and rust removal, wherein the anticorrosive paint forms an anticorrosive coating 7 on the outer surface of the work steel pipe 1;

step three, winding an aluminum foil layer 8 after the anticorrosive layer 7 is dried, wherein one surface of the aluminum foil layer 8 containing aluminum foil faces outwards;

step four, sleeving the ceramic fiber pipes 3 on the working steel pipe 1, reserving sections of 20-30 cm at two ends of the working steel pipe 1 respectively, connecting the two adjacent ceramic fiber pipes 3 through a socket 401 and a socket 402, and sleeving a high-temperature-resistant sealing ring 403 on the socket 402.

Of particular note are: the high-strength ceramic fiber pipe 3 can be arranged at a position where a fixed bracket, a guide bracket, a sliding bracket or other supporting pipelines need to be installed. The high-strength ceramic fiber tube 3 has a compressive strength (no deformation) of not less than 0.4 MPa. The ceramic fiber pipe 3 with general strength can be arranged at other positions of the pipeline, and the compressive strength of the ceramic fiber pipe 3 with general strength is not lower than 0.2MPa when the deformation is 10 percent. The support (fixed bolster, guide bracket, sliding bracket and the like) is fixed on the outer protecting pipe, so that the heat-insulating factory prefabrication can be realized, the difficulty in field construction and installation is greatly reduced, the construction period is shortened, the construction cost is reduced, and the heat loss generated by a support heat bridge can be reduced.

The ceramic fiber tube 3 is prepared by mixing ceramic fiber, inorganic adhesive and water and then centrifugally drying in a mould, and can reach the designed thickness at one time without being wrapped layer by layer.

Binding and fixing the support frame 6 on the outer surface of the ceramic fiber pipe 3; as shown in fig. 3, the supporting frame 6 is composed of a plurality of supporting blocks arranged in a ring shape, and the supporting blocks are bound on the ceramic fiber tube 3 after being connected in series by iron wires.

Welding temporary limit protection plates 11 at two ends of the working steel pipe 1, wherein the limit protection plates 11 abut against the ceramic fiber pipe 3 to prevent the ceramic fiber pipe from moving axially; it should be noted that the rear position limiting protection plate 11 needs to be removed.

Seventhly, sleeving an outer protection pipe 2 on the outer side of the ceramic fiber pipe 3, temporarily plugging two ports of the outer protection pipe 2, forming a polyurethane injection hole 9 in the middle of the outer protection pipe 2, injecting foamed polyurethane into a gap between the ceramic fiber pipe 3 and the outer protection pipe 2 through the polyurethane injection hole 9, enabling the foamed polyurethane to flow towards the end of the outer protection pipe 2 through the support frame 6, forming a polyurethane heat insulation layer 5 after the foamed polyurethane is solidified, and sealing the polyurethane injection hole 9 through a hot melting plug 10 in the later period.

The above-described embodiments are only intended to illustrate the preferred embodiments of the present invention, and not to limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims (9)

1. The utility model provides a compound incubation pipe is maked somebody a mere figurehead to prefabrication for carrying high temperature heat medium, includes work steel pipe (1) and outer pillar (2), its characterized in that: the ceramic fiber pipe is characterized in that a plurality of ceramic fiber pipes (3) are sleeved on the working steel pipe (1), the ceramic fiber pipes (3) are manufactured by adopting ceramic fibers, inorganic adhesives and water to be mixed and then are centrifugally dried in a mold, the ceramic fiber pipes (3) are sequentially connected end to end through socket structures (4), a polyurethane heat insulation layer (5) is filled in a gap between the ceramic fiber pipes (3) and the outer protective pipes (2), a support frame (6) is arranged in the polyurethane heat insulation layer (5), and the support frame (6) abuts against the outer protective pipes (2) and the ceramic fiber pipes (3).

2. The prefabricated overhead composite heat-insulating pipe for conveying high-temperature heat medium of claim 1, characterized in that: the socket structure (4) comprises a socket (401) and a spigot (402) which are in plug-in fit, and the socket (401) and the spigot (402) are respectively arranged at two ends of the ceramic fiber pipe (3).

3. The prefabricated overhead composite insulating pipe for conveying high-temperature heating medium of claim 2, characterized in that: and a high-temperature-resistant sealing ring (403) is arranged between the socket (401) and the socket (402).

4. The prefabricated overhead composite insulating pipe for conveying high-temperature heating medium of claim 3, characterized in that: the high-temperature-resistant sealing ring (403) is sleeved on the socket (402), and the outer circular wall of the high-temperature-resistant sealing ring (403) abuts against the inner wall of the socket (401).

5. The prefabricated overhead composite insulating pipe for conveying high-temperature heating medium of claim 1, characterized in that: the outer surface of the working steel pipe (1) is coated with an anticorrosive coating (7).

6. The prefabricated overhead composite insulating pipe for conveying high-temperature heating medium of claim 5, characterized in that: an aluminum foil layer (8) is wound on the anticorrosive layer (7), and one side of the aluminum foil layer (8) containing an aluminum foil faces outwards.

7. The prefabricated overhead composite heat-insulating pipe for conveying high-temperature heat medium of claim 1, characterized in that: the outer wall of the outer protecting pipe (2) is provided with a polyurethane injection hole (9), and the polyurethane injection hole (9) is sealed by a hot melting plug (10) at the later stage.

8. The prefabricated overhead composite insulating pipe for conveying high-temperature heating medium of claim 1, characterized in that: the outer protecting pipe (2) is a galvanized air pipe.

9. A production process of a prefabricated overhead composite heat-insulating pipe for conveying a high-temperature heat medium is characterized by comprising the following steps of:

performing shot blasting rust removal treatment on a working steel pipe (1);

spraying anticorrosive paint on the working steel pipe (1) after shot blasting and rust removal, wherein the anticorrosive paint forms an anticorrosive coating (7) on the outer surface of the working steel pipe (1);

thirdly, winding an aluminum foil layer (8) after the anticorrosive layer (7) is dried, wherein one surface of the aluminum foil layer (8) containing aluminum foil faces outwards;

sleeving the ceramic fiber pipes (3) on the working steel pipe (1), reserving sections of 20-30 cm at two ends of the working steel pipe (1), connecting two adjacent ceramic fiber pipes (3) through a socket (401) and a spigot (402), and sleeving a high-temperature-resistant sealing ring (403) on the spigot (402);

fixing a support frame (6) on the outer surface of the ceramic fiber pipe (3);

welding temporary limiting protection plates (11) at two ends of the working steel pipe (1), wherein the limiting protection plates (11) abut against the ceramic fiber pipe (3) to prevent the ceramic fiber pipe from moving axially;

seventhly, an outer protection pipe (2) is sleeved on the outer side of the ceramic fiber pipe (3), a polyurethane injection hole (9) is formed in the middle of the outer protection pipe (2), foamed polyurethane is injected into a gap between the ceramic fiber pipe (3) and the outer protection pipe (2) through the polyurethane injection hole (9), and the polyurethane injection hole (9) is sealed through hot melting plugging (10) in the later period.

Images