CN110594532A - A composite insulation prefabricated overhead steam insulation pipe and its processing technology - Google Patents

Abstract

The invention discloses a composite thermal insulation prefabricated overhead steam thermal insulation pipe, which relates to the field of thermal pipelines and includes a steam pipe, on which a casing is sheathed, and a glass wool layer, a support layer and a foam layer are arranged between the steam pipe and the casing; the glass The cotton layer is wrapped and arranged around the steam pipe, the support layer is arranged between the foam layer and the glass wool layer, and the foam layer is filled and arranged between the support layer and the shell. Aiming at the problem of high cost in the prior art, the present invention reduces the proportion of the foam layer by increasing the proportion of glass wool in the insulation pipe, and then reduces the production cost of the insulation pipe, which is convenient for popularization and popularization; in addition, because the glass wool The high temperature resistance of the foam layer is stronger than that of the foam layer. In the present invention, the glass wool layer is arranged near the steam pipe circumference, which can also effectively improve the safety of the heat preservation pipe.

Description

A composite insulation prefabricated overhead steam insulation pipe and its processing technology

technical field

The invention relates to the field of thermal pipelines, more specifically, it relates to a composite thermal insulation prefabricated overhead steam thermal insulation pipe and its processing technology.

Background technique

Industrial steam transmission and distribution pipeline network (hereinafter referred to as heat network), as an integral part of cogeneration, plays an important role in energy saving and emission reduction. There are two laying methods for the heating network used as steam transmission and distribution: overhead and direct burial. About 90% of them are laid overhead. The heating network laid overhead faces the natural external influences of wind, rain and sun. Human activities such as vehicle scraping and collision, people trampling, etc. also have an impact on the heating network. The above-mentioned various external effects often make the thermal insulation shell of the heating network pipe deform, rupture and fall off. Furthermore, wind and rain enter the insulation layer of the pipeline, deforming and deteriorating the insulation material, resulting in loss. For the industrial steam transmission heat network, the transmission heat efficiency should not be lower than 92% (the national standard stipulates), and the online heat network rarely meets the standard. The efficiency of some heating networks with poor construction quality and lack of management and maintenance can even be as low as about 70%.

After the advent of factory prefabricated tile (microporous calcium silicate tile)-foam (rigid polyurethane foam) composite thermal insulation overhead laying steam insulation pipe, it has completely changed the situation of on-site thermal insulation construction of overhead steam pipe network, serious additional heat loss and low thermal efficiency. The market responded enthusiastically and praised it.

However, rigid polyurethane foam and microporous calcium silicate tiles are more expensive in conventional insulation materials. Compared with the traditional heating network project, the factory prefabricated insulation method makes the construction cost of the heating network much higher. To a certain extent, it has affected the popularization speed of prefabricated overhead thermal insulation steam pipes.

Contents of the invention

Aiming at the problem of high cost in the prior art, the object of the present invention is to provide a composite thermal insulation prefabricated overhead steam insulation pipe, which has the advantages of excellent thermal insulation performance, low cost and easy popularization and use.

To achieve the above object, the present invention provides the following technical solutions:

A composite thermal insulation prefabricated overhead steam insulation pipe, comprising a steam pipe, the steam pipe is covered with a casing, and a glass wool layer, a support layer and a foam layer are arranged between the steam pipe and the casing;

The glass wool layer is wrapped and arranged around the steam pipe, the support layer is arranged between the foam layer and the glass wool layer, and the foam layer is filled between the support layer and the outer shell between.

Through the above technical scheme, the proportion of glass wool in the insulation pipe is increased, thereby reducing the proportion of the foam layer, and then reducing the production cost of the insulation pipe, which is convenient for popularization and popularization; because the glass wool layer is more resistant to high temperature than the foam layer, In the present invention, a glass wool layer is arranged near the steam pipe circumference, which can also effectively improve the safety of the heat preservation pipe; the present invention arranges a support layer between the foam layer and the glass wool layer, firstly, to enhance the structural strength and assist the foam The layer is subjected to disturbances such as external pressure and collisions, so as to avoid extrusion of the shell of the insulation pipe, and then extrusion of the insulation cotton, resulting in a reduction in the insulation performance of the insulation cotton layer or even failure. Second, the support layer is also used to withstand the pressure during foaming to ensure The part around the steam pipe is made of glass wool, which is convenient for processing and production.

Further, a support is provided at the end of the glass wool layer between the supporting layer and the steam pipe.

Through the above technical solution, the support is used to bear the weight of the steam pipe, so as to avoid the extrusion of the steam pipe and the extrusion of the shell of the heat preservation pipe, which in turn squeezes the insulation cotton, resulting in a decrease in the insulation performance of the insulation cotton layer or even failure.

Further, the support layer and the support are both spliced and fixed by a plurality of tile arches.

Through the above-mentioned technical scheme, the tile arch has a customized size, which is convenient for processing products that meet the requirements; in addition, the tile arch has excellent heat insulation performance and strong compressive and load-bearing performance.

Furthermore, tile arches between adjacent floors are set in dislocation.

Through the above technical solution, the tile arches between adjacent layers are arranged in dislocation, which facilitates the transmission of force between layers and improves the supporting strength of the end supports.

A processing technology for composite insulation prefabricated overhead steam insulation pipes, comprising the following steps:

S1, wrap and fix glass wool felt around the steam pipe to form a glass wool layer;

S2, splicing and fixing multiple tile arches to each other through a mold to form a supporting layer;

S3, putting the shell on the support layer, and performing foaming operation between the shell and the support layer to form a foam layer;

S4, taking off the shell, the foam layer and the supporting layer from the mold together;

S5, inserting the steam pipe together with the glass wool layer wrapped around it into the supporting layer;

S6, a plurality of tile arches are embedded between the support layer and the steam pipe at the end of the foam layer to form a support.

Through the above technical scheme, the present invention provides a support layer between the foam layer and the glass wool layer. Firstly, the structural strength is enhanced, and the foam layer is supported to withstand disturbances such as external pressure and collisions, so as to avoid extrusion of the insulation pipe shell, and then Extruding the insulation cotton will reduce or even invalidate the thermal insulation performance of the insulation cotton layer. Second, the support layer is also used to withstand the pressure during foaming to ensure that the surrounding parts of the steam pipe are made of glass wool, which is convenient for processing and production.

Further, step S2 specifically includes the following steps:

S21, at least two layers of sliding films are sleeved on the mold pillars;

S22, laying a plurality of tile arches on the outer sliding film, and fixing adjacent tile arches with an adhesive.

Through the above technical solution, the sliding performance between the two sliding films is used to facilitate subsequent removal of the shell, the foam layer and the supporting layer from the mold.

Further, the sliding film is made of high-density polyethylene, and both sides of the sliding film are set as smooth surfaces.

Through the above technical solution, the high-density polyethylene is easy to obtain, the material is cheap, and the sliding performance is excellent in a smooth surface state.

Further, step S3 specifically includes the following steps:

S31, sleeve the casing on the support layer, and fix the casing at a position coaxial with the support layer;

S32, enclosing the space between the support layer and the shell;

S33, pouring foam material between the supporting layer and the shell.

Through the above technical solution, it is beneficial for the foaming material to be fully filled between the support layer and the shell.

Further, a flame retardant is mixed into the foamed material.

Through the above technical proposal, the fireproof performance of the foam layer is further improved.

Further, step S5 specifically includes the following steps:

S51, the ribbon is used to wrap around the glass wool layer, and the ribbon is in the state of extruding the glass wool felt;

S52, inserting the steam pipe, the glass wool layer and the ribbon into the supporting layer together;

S53, draw out the ribbon.

Through the above technical proposal, the ribbon is used to squeeze the glass wool layer to reduce its radius, and it is convenient to insert the steam pipe, the glass wool layer and the ribbon into the supporting layer together.

Compared with prior art, the beneficial effect of the present invention is:

(1) By increasing the proportion of glass wool in the insulation pipe, thereby reducing the proportion of the foam layer, and then reducing the production cost of the insulation pipe, it is easy to popularize and promote the use;

(2) Because the high temperature resistance of the glass wool layer is stronger than that of the foam layer, the glass wool layer is arranged near the steam pipe peripheral side in the present invention, which can also effectively improve the safety of the thermal insulation pipe;

(3) By the present invention, a support layer is set between the foam layer and the glass wool layer. One, the structural strength is enhanced, and the foam layer is supported to withstand disturbances such as external pressure and collisions, so as to prevent the insulation pipe shell from being extruded, and then extruded Pressing the insulation cotton will cause the insulation performance of the insulation cotton layer to decrease or even fail. Second, the support layer is also used to withstand the pressure during foaming to ensure that the parts around the steam pipe are made of glass wool, which is convenient for processing and production;

(4) Further, the foam layer is formed by foaming between the shell and the support layer. This processing method can completely eliminate the gap between the inner layers of the insulation pipe, and the inner space of the insulation is complete without vacancies, that is, to eliminate It eliminates the additional heat loss caused by cold air penetration, and also eliminates the convection of air in the insulation pipe, eliminating the convective heat loss in the insulation layer in the traditional insulation structure;

(5) Further, by using a complete metal shell to isolate rainwater, the additional heat loss caused by rainwater is eliminated;

(6) Further, by using high-strength microporous calcium silicate tiles as pipe support, the additional heat loss caused by the thermal bridge formed by using steel plates as pipe supports in traditional overhead pipes is eliminated.

Description of drawings

Fig. 1 is the structural representation of a kind of composite insulation prefabricated overhead steam insulation pipe;

Fig. 2 is the end view of a kind of composite insulation prefabricated overhead steam insulation pipe;

Figure 3 is a block diagram of a process in the present invention.

Reference signs: 1. Steam pipe; 2. Shell; 3. Glass wool layer; 4. Support layer; 5. Foam layer; 6. Support.

Detailed ways

In order to make the purpose, technical solutions and beneficial effects of the present invention clearer, the present invention will be further described in detail below in conjunction with the examples and accompanying drawings, but the embodiments of the present invention are not limited thereto.

A composite insulation prefabricated overhead steam insulation pipe, as shown in Figure 1 and Figure 2, includes a steam pipe 1, the steam pipe 1 is a steel pipe, and the steam pipe 1 is provided with a shell 2, the shell 2 is a hard aluminum alloy sheet, the thickness From 0.5mm to 1.5mm, stainless steel plate, color steel plate, galvanized iron sheet and composite metal sheet can also be selected according to needs. A ring-shaped glass wool layer 3 , a support layer 4 and a foam layer 5 are sequentially arranged between the steam pipe 1 and the shell 2 from inside to outside.

The glass wool layer 3 is wrapped around the side of the steam pipe 1. The material of the glass wool layer 3 is glass wool felt. Among the conventional heat preservation materials, the glass wool felt is the cheapest heat preservation material second only to polyurethane foam in heat preservation performance. Its price is only equivalent to one-third of the price of polyurethane foam of the same volume. The thermal insulation performance can be equivalent to three-quarters of the same volume of polyurethane foam. Glass wool felt can withstand temperatures above 100°C to 300°C, which cannot be tolerated by conventional polyurethane foam in high temperature areas.

The support layer 4 is arranged between the foam layer 5 and the glass wool layer 3, and the foam layer 5 is filled and arranged between the support layer 4 and the shell 2. The material of the foam layer 5 is rigid polyurethane foam, and the rigid polyurethane foam is made of conventional thermal insulation materials. It has the best thermal insulation performance, and its compressive strength can reach more than 0.3MPa. Polyurethane foam is non-absorbent, impermeable, continuous and seamless, and can fill any shape of thermal insulation space. There is no substitute for the outer insulation of pipes, pipe fittings (tee elbows in pipe networks, etc.). In addition, since the foam layer 5 is formed by pouring and foaming, the foam layer 5 formed by foaming also has the function of connecting the shell 2 and the supporting layer 4 .

However, glass wool felt has no fixed shape, cannot withstand pressure, absorbs moisture, and is afraid of water immersion. In addition, glass wool felt is also easy to deform and deteriorate. If it is used alone as a pipeline insulation material, its excellent performance will be lost in its many weak features. . The present invention provides a solid protective shell for the glass wool by arranging the foam layer 5 around the glass wool layer 3, and complements the inherent short board of the glass wool, thereby greatly reducing the product cost of the thermal pipeline; the support layer 4 is used for protection and support , to prevent the foam from squeezing the glass wool layer 3 during the foaming process, causing the thermal insulation performance of the glass wool layer 3 to decrease or even fail.

Between the support layer 4 and the steam pipe 1, a support 6 is provided at the end of the glass wool layer 3. Both the support layer 4 and the support 6 are spliced into a ring by a plurality of tile arches, and the tile arches are bonded with a special adhesive. firmly fixed. In addition, viewed from the end face, tile arches between adjacent layers are arranged in dislocation, which facilitates force transmission between layers and improves the supporting strength of the end support 6 .

A processing technology for composite thermal insulation prefabricated overhead steam thermal insulation pipe, as shown in Figure 3, based on the above-mentioned composite thermal insulation prefabricated overhead steam thermal insulation pipe, comprising the following steps:

S1, Wrap and fix glass wool felt around the steam pipe 1 to form a glass wool layer 3; the density ρ of the glass wool felt is equal to 48kg/m³, glass wool felt with a slightly higher density can be used, but the density lower than 48kg/m³ cannot be used m³ of cotton felt. When the steam temperature is too high for the glass wool blanket to bear, a layer of high temperature resistant aluminum silicate wool blanket can be laid on the side close to the steam pipe, and then the glass wool blanket can be laid outside.

S2, splicing and fixing a plurality of tile arches with each other through a mold to form a supporting layer 4;

It specifically includes the following steps: S21, set two layers of sliding film on the mold column, the material of the sliding film is high-density polyethylene, and both sides of the sliding film are smooth surfaces; S22, slide the film on the outer layer Lay multiple tile arches. The tile arches are high-strength microporous calcium silicate tiles with a thickness of 30mm~40mm and a compressive strength of 0.5MPa~2.0MPa. The tile arches are bonded with a special adhesive to form a whole , both the normal plane and the axial plane must be coated with adhesive.

S3, set the shell 2 on the support layer 4, and perform foaming operation between the shell 2 and the support layer 4 to form a foam layer 5;

It specifically includes the following steps: S31, set the shell 2 on the support layer 4, the shell 2 is a hard aluminum alloy sheet, the thickness is from 0.5mm to 1.5mm, and stainless steel plate, color steel plate, galvanized iron sheet and composite sheet metal. The shell 2 is formed into a thin-walled metal sleeve by a special mechanical spiral rolling bite. During the rolling process, continuous ribs are pressed out on the metal plate to improve the rigidity of the sleeve. The shell 2 is fixed on the coaxial position with the support layer 4 through the mould; S32, the two ends are blocked by sealing end plates, and the space between the support layer 4 and the shell 2 is closed; S33, the two sides of the side wall of the shell 2 One hole is set at each end, one is used as a material injection hole, and the other is used as an air outlet hole, and the foaming method is used between the support layer 4 and the shell 2 to form a foam layer 5, and a flame retardant can be mixed in the foaming material. to improve fire performance.

S4, remove the shell 2, the foam layer 5 and the support layer 4 from the mold together, and tear off the sliding film, because the two-layer sliding film is set, the removal operation becomes convenient;

S5, inserting the steam pipe 1 together with the glass wool layer 3 wrapped around it into the supporting layer 4;

Concretely include the following steps: S51, use ribbons to wrap around the glass wool layer 3, the ribbons are in the state of extruding the glass wool felt, reduce the radius of the glass wool layer 3, and facilitate subsequent operations; S52, wrap the steam pipe 1, glass wool Layer 3 is inserted into the support layer 4 together; S53, pulling out the ribbon.

S6 , between the supporting layer 4 and the steam pipe 1 , a plurality of tile arches are embedded at the end of the foam layer 5 to form a support 6 to bear the weight of the steam pipe 1 . The tile arch is a high-strength microporous calcium silicate tile, and the inner circular surface of the tile arch is impregnated with graphite lubricant, which facilitates the axial displacement of the steam pipe 1 after being heated.

In summary:

In the present invention, the proportion of glass wool in the insulation pipe is increased, thereby reducing the proportion of the foam layer 5, and then reducing the production cost of the insulation pipe; A glass wool layer 3 is arranged on the side of the steam pipe 1, which can also effectively improve the safety of the heat preservation pipe; the present invention is provided with a support layer 4 between the foam layer 5 and the glass wool layer 3. Firstly, the structural strength is enhanced, and the auxiliary foam Layer 5 bears disturbances such as external pressure and collisions, avoiding the extrusion of the insulation pipe shell 2, and then extruding the insulation cotton, causing the thermal insulation performance of the insulation cotton layer to decrease or even fail. Second, the support layer 4 is also used to withstand the impact of foaming Pressure, ensure that the part around the side of the steam pipe is made of glass wool, which is convenient for processing and production.

Furthermore, in the present invention, the foam layer 5 is formed by foaming between the shell 2 and the support layer 4. This processing method can completely eliminate the gap between the inner layers of the heat preservation pipe, and the inner space of the heat preservation pipe is intact. The vacancy means that the additional heat loss caused by the penetration of cold air is eliminated, and the convection of air in the insulation pipe is also eliminated, which eliminates the convective heat loss in the insulation layer in the traditional insulation structure.

Further, the present invention adopts a complete metal casing 2 to isolate rainwater, so that additional heat loss caused by rainwater is eliminated.

Furthermore, the present invention uses high-strength microporous calcium silicate tiles as the pipeline support 6, which eliminates the additional heat loss caused by the thermal bridge formed by using steel plates as pipeline supports in traditional overhead pipelines; The impregnated graphite lubricant is beneficial to the axial displacement of the steam pipe 1 after being heated, and is especially suitable for expansion and contraction of the internal sliding pipe.

Compared with the tile-foam composite overhead steam insulation pipe prefabricated by the factory, the same insulation effect can be achieved, and the cost of insulation materials can be saved by half at most. Among them, the larger the pipe diameter, the thicker the insulation layer, and the more obvious the effect.

The above descriptions are only preferred implementations of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions under the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention should also be regarded as the protection scope of the present invention.

Claims (10)

1. A composite heat-insulation prefabricated overhead steam heat-insulation pipe comprises a steam pipe (1), wherein a shell (2) is sleeved on the steam pipe (1), and is characterized in that a glass wool layer (3), a supporting layer (4) and a foam layer (5) are arranged between the steam pipe (1) and the shell (2);

the glass wool layer (3) is wrapped on the periphery of the steam pipe (1), the supporting layer (4) is arranged between the foam layer (5) and the glass wool layer (3), and the foam layer (5) is filled between the supporting layer (4) and the shell (2).

2. The composite heat-insulating prefabricated overhead steam heat-insulating pipe as claimed in claim 1, characterized in that a support (6) is arranged between the support layer (4) and the steam pipe (1) at the end of the glass wool layer (3).

3. The composite heat-insulating prefabricated overhead steam heat-insulating pipe as claimed in claim 2, wherein the supporting layer (4) and the support (6) are formed by splicing and fixing a plurality of tile arches.

4. The composite insulating prefabricated overhead steam insulating pipe as claimed in claim 3, wherein the tile arches between adjacent layers are staggered.

5. The processing technology of the composite heat-insulation prefabricated overhead steam heat-insulation pipe is characterized by comprising the following steps of:

s1, wrapping and fixing a glass wool felt on the peripheral side of the steam pipe (1) to form a glass wool layer (3);

s2, splicing and fixing a plurality of tile arches to form a supporting layer (4) through a mould;

s3, sleeving the shell (2) on the supporting layer (4), and performing foaming operation between the shell (2) and the supporting layer (4) to form a foam layer (5);

s4, taking down the shell (2), the foam layer (5) and the support layer (4) from the die;

s5, inserting the steam pipe (1) and the glass wool layer (3) wrapped around the steam pipe into the support layer (4);

s6, embedding a plurality of tile arches at the end of the foam layer (5) between the support layer (4) and the steam pipe (1) to form a support (6).

6. The processing technology of the composite heat-insulating prefabricated overhead steam heat-insulating pipe according to claim 5, wherein the step S2 specifically comprises the following steps:

s21, sleeving at least two sliding films on the mold column;

and S22, laying a plurality of tile arches on the outer sliding film, and fixing the adjacent tile arches by using an adhesive.

7. The processing technology of the composite heat-insulating prefabricated overhead steam heat-insulating pipe as claimed in claim 6, wherein the material of the sliding film is high-density polyethylene, and both sides of the sliding film are provided with smooth surfaces.

8. The processing technology of the composite heat-insulating prefabricated overhead steam heat-insulating pipe according to claim 5, wherein the step S3 specifically comprises the following steps:

s31, sleeving the shell (2) on the supporting layer (4), and fixing the shell (2) on a position coaxial with the supporting layer (4);

s32, sealing the space between the support layer (4) and the shell (2);

s33, filling foaming materials between the supporting layer (4) and the shell (2).

9. The process for manufacturing a composite heat-insulating prefabricated overhead steam heat-insulating pipe according to claim 8, wherein a flame retardant is doped in the foaming material.

10. The processing technology of the composite heat-insulating prefabricated overhead steam heat-insulating pipe according to claim 9, wherein the step S5 specifically comprises the following steps:

s51, winding the silk ribbon to the periphery of the glass wool layer (3), wherein the silk ribbon is in a state of extruding the glass wool felt;

s52, inserting the steam pipe (1), the glass wool layer (3) and the silk ribbon into the support layer (4) together;

and S53, drawing out the silk ribbon.