阅读说明：本技术 一种耐腐蚀管道及其成型方法 (Corrosion-resistant pipeline and forming method thereof ) 是由 李建财 封雨田 郑俊华 解文越 于 2019-10-18 设计创作，主要内容包括：本发明公开了一种耐腐蚀管道及其成型方法,耐腐蚀管道包括内管及复合材料层,所述复合材料层预应力缠绕于内管的外侧；所述复合材料层包括玻璃纤维及环氧树脂,玻璃纤维浸润于环氧树脂并将含有环氧树脂的玻璃纤维缠绕至内管的周向外侧。本发明提供的一种耐腐蚀管道及其成型方法,适用于石灰石湿法脱硫系统,其结构合理,使用可靠,广泛应用于石灰石浆液流经的管路,有效防止管道的腐蚀,同时,保证了管道的强度,延长了石灰石湿法脱硫系统中管道的使用寿命,提高了湿法脱硫系统运行的稳定性。(The invention discloses a corrosion-resistant pipeline and a forming method thereof, wherein the corrosion-resistant pipeline comprises an inner pipe and a composite material layer, wherein the composite material layer is wound on the outer side of the inner pipe in a prestressed manner; the composite material layer comprises glass fibers and epoxy resin, the glass fibers are soaked in the epoxy resin, and the glass fibers containing the epoxy resin are wound to the circumferential outer side of the inner pipe. The corrosion-resistant pipeline and the forming method thereof provided by the invention are suitable for a limestone wet desulphurization system, have reasonable structure and reliable use, are widely applied to pipelines through which limestone slurry flows, effectively prevent the corrosion of the pipeline, ensure the strength of the pipeline, prolong the service life of the pipeline in the limestone wet desulphurization system and improve the running stability of the wet desulphurization system.)

1. The corrosion-resistant pipeline is characterized by comprising an inner pipe and a composite material layer, wherein the composite material layer is wound on the outer side of the inner pipe in a prestressed mode; the composite material layer comprises glass fibers and epoxy resin, the glass fibers are soaked in the epoxy resin, and the glass fibers containing the epoxy resin are wound to the circumferential outer side of the inner pipe.

2. The corrosion resistant pipe of claim 1 wherein said composite layer further comprises a curing agent in a 1:10 weight ratio to epoxy resin.

3. The corrosion resistant pipe of claim 1 wherein said epoxy containing fiberglass pre-stressed coil is wound around the outside of the inner pipe with a pre-stress of no more than 50 Mpa.

4. The corrosion resistant pipe of claim 3 wherein the glass fibers apply a pre-stress in a stepwise decreasing manner about the inner pipe, the glass fiber layers about the outside of the inner pipe having twelve layers, the first layer of glass fibers having a pre-stress of 45 Mpa.

5. The corrosion resistant pipe of claim 1 wherein said fiberglass hoop is wound circumferentially outside of said inner pipe, said winding angle being no greater than 15 °.

6. The corrosion-resistant pipeline according to claim 1, wherein the glass fiber composite material formed by winding the glass fiber containing the epoxy resin around the inner pipe is subjected to rotary curing molding, wherein the curing temperature is 60 ℃ and the curing time is 120 min.

7. The corrosion resistant pipe of claim 1 wherein the glass fibers comprise not less than 80% by volume of the composite layer.

8. The corrosion resistant pipe of claim 1 wherein the thickness ratio of the inner pipe to the composite layer is 1: 1.2.

9. The corrosion resistant conduit of claim 1, wherein the inner tube is 316L stainless steel.

10. A method for forming a corrosion-resistant pipe, comprising the steps of:

s1, fixing the inner pipe on a winding device through an inner expanding mandrel, and driving the inner pipe to rotate by the winding device;

s2, overlapping the glass fiber at the end of the inner tube, soaking the glass fiber in epoxy resin, and winding the glass fiber containing the epoxy resin to the circumferential outer side of the inner tube;

s3, placing the assembly formed by the inner pipe and the composite material layer in a curing device for curing;

and S4, removing the internal expanding mandrel.

Technical Field

The invention belongs to the technical field of wet flue gas desulfurization, and relates to a corrosion-resistant pipeline and a forming method thereof.

Background

The main power generation mode of a thermal power plant is coal-fired thermal power generation, and combustion of coal can generate a large amount of flue gas containing harmful substances, such as sulfur dioxide. With the development of the power industry, the pollution of sulfur dioxide to the environment is increasingly serious. In order to eliminate environmental pollution, a limestone wet desulphurization technology with high desulphurization efficiency is generally adopted in power plants. When the gypsum slurry is operated, the limestone powder and sulfur dioxide in the flue gas react in the desulfurization reaction tower, and about 90% of the sulfur dioxide in the flue gas is eliminated, so that the gypsum slurry with the water content of 80% is generated.

In the limestone wet desulphurization system, a large amount of gypsum slurry can be generated, the gypsum slurry contains a large amount of particles, the wear resistance and corrosion resistance of a common pipeline are not strong, the service life is extreme, and especially, the pipeline at the inlet of a gypsum slurry pump and the position of the top of a limestone slurry tank where limestone slurry is supplied and flows back is easy to cause pipeline leakage due to excessive wear, so that the stable operation of the limestone wet desulphurization system is seriously influenced.

Therefore, it is necessary to design a corrosion-resistant pipeline and a forming method thereof to solve the existing technical problems.

Disclosure of Invention

The invention aims to solve at least part of technical problems in the prior art to a certain extent, and provides a corrosion-resistant pipeline and a forming method thereof, which are suitable for a limestone wet desulphurization system, have reasonable structure and reliable use, are widely applied to pipelines through which limestone slurry flows, effectively prevent the corrosion of the pipeline, ensure the strength of the pipeline, prolong the service life of the pipeline in the limestone wet desulphurization system, improve the running stability of the wet desulphurization system and have good popularization value.

In order to solve the technical problem, the invention provides a corrosion-resistant pipeline which comprises an inner pipe and a composite material layer, wherein the composite material layer is wound on the outer side of the inner pipe in a prestressed mode; the composite material layer comprises glass fibers and epoxy resin, the glass fibers are soaked in the epoxy resin, and the glass fibers containing the epoxy resin are wound to the circumferential outer side of the inner pipe.

In some embodiments, the composite layer further comprises a curing agent in a 1:10 weight ratio to the epoxy resin.

In some embodiments, the glass fiber containing epoxy resin is pre-stressed and wound outside the inner pipe with a pre-stress of no more than 50 Mpa.

In some embodiments, the glass fibers exert a pre-stress on the inner tube in a stepwise decreasing manner, the glass fiber layers wound on the outer side of the inner tube have twelve layers, and the pre-stress of the first layer of glass fibers is 45 Mpa.

In some embodiments, the fiberglass is hoop wound about the circumferentially outer side of the inner tube at a wind angle of no greater than 15 °.

In some embodiments, the glass fiber containing the epoxy resin is wound on the inner tube to form the glass fiber composite material, and then is subjected to rotary curing molding, wherein the curing temperature is 60 ℃, and the curing time is 120 min.

In some embodiments, the glass fibers comprise no less than 80% by volume of the composite layer.

In some embodiments, the thickness ratio of the inner tube to the composite layer is 1: 1.2.

In some embodiments, the inner tube is 316L stainless steel.

Meanwhile, the invention also discloses a forming method of the corrosion-resistant pipeline, which comprises the following steps:

s1, fixing the inner pipe on a winding device through an inner expanding mandrel, and driving the inner pipe to rotate by the winding device;

s2, overlapping the glass fiber at the end of the inner tube, soaking the glass fiber in epoxy resin, and winding the glass fiber containing the epoxy resin to the circumferential outer side of the inner tube;

s3, placing the assembly formed by the inner pipe and the composite material layer in a curing device for curing;

and S4, removing the internal expanding mandrel.

The invention has the beneficial effects that:

the corrosion-resistant pipeline and the forming method thereof provided by the invention are suitable for a limestone wet desulphurization system, have reasonable structure and reliable use, are widely applied to pipelines through which limestone slurry flows, effectively prevent the corrosion of the pipeline, ensure the strength of the pipeline, prolong the service life of the pipeline in the limestone wet desulphurization system, improve the running stability of the wet desulphurization system and have good popularization value.

Drawings

The above advantages of the present invention will become more apparent and more readily appreciated from the detailed description set forth below when taken in conjunction with the drawings, which are intended to be illustrative, not limiting, of the invention and in which:

FIG. 1 is a schematic structural view of a corrosion resistant pipe according to the present invention;

FIG. 2 is a schematic illustration of the application of pre-stress to layers of the composite material layer of the present invention;

FIG. 3 is a schematic structural view of a winding apparatus of the present invention;

FIG. 4 is a schematic view of the winding of glass fibers according to the present invention.

In the drawings, the reference numerals denote the following components:

10-an inner tube; 20-a composite layer; 30-a three-jaw chuck; 40-a tailstock; 50-moving the trolley; 60-glass fiber roll; 70-glue solution constant temperature device; 80-a wire pressing wheel; 100-winding device.

Detailed Description

Fig. 1 is a schematic view of a corrosion-resistant pipe and a method for forming the same according to the present application, and the present invention will be described in detail with reference to the following embodiments and the accompanying drawings.

The examples described herein are specific embodiments of the present invention, are intended to be illustrative and exemplary in nature, and are not to be construed as limiting the scope of the invention. In addition to the embodiments described herein, those skilled in the art will be able to employ other technical solutions which are obvious based on the disclosure of the claims and the specification of the present application, and these technical solutions include technical solutions which make any obvious replacement or modification for the embodiments described herein.

The drawings in the present specification are schematic views to assist in explaining the concept of the present invention, and schematically show the shapes of respective portions and their mutual relationships. It is noted that the drawings are not necessarily to the same scale so as to clearly illustrate the structures of the various elements of the embodiments of the invention. Like reference numerals are used to denote like parts.

The structural schematic diagram of a corrosion-resistant pipeline described in the present application is shown in fig. 1, and includes an inner pipe 10 and a composite material layer 20, where the composite material layer 20 is wound around the outer side of the inner pipe 10 in a prestressed manner; the composite material layer 20 includes glass fibers and epoxy resin, and the glass fibers are soaked in the epoxy resin and wind the glass fibers containing the epoxy resin to the circumferential outer side of the inner tube 10.

As an embodiment of the present invention, the inner pipe 10 has superior wear resistance, and may be one of stainless steel, heat-resistant steel, and wear-resistant steel, such as high manganese steel, e.g., 60Mn, ZGMn 13; the inner pipe 10 may also be 316L stainless steel and the inner wall of the inner pipe 10 is in contact with the particles in the gypsum slurry with little or no abrasion.

As another embodiment of the present invention, the composite material layer 20 further includes a curing agent in a weight ratio of 1:10 to the epoxy resin. The epoxy resin and the curing agent can be in a liquid state at normal temperature, so that the glass fiber used for winding can be soaked in the composition of the epoxy resin and the curing agent, and the composition is laid on the outer periphery of the inner tube 10 by the glass fiber in the winding process; after the composite material layer formed by the epoxy resin, the curing agent and the glass fiber outside the inner tube 10 is wound and formed, a curing process is required so that the hardness of the composite material layer 20 is increased. The composite material layer has good corrosion resistance and can be suitable for limestone wet desulphurization.

In the invention, the glass fiber containing the epoxy resin is wound outside the inner pipe 10 in a prestressed manner, the prestress of the glass fiber is not more than 50Mpa, and the glass fiber is wound by a wet method with the prestress, so that the strength of a corrosion-resistant pipeline can be effectively improved, and the strength requirement of the pipeline in a limestone wet desulphurization system is met.

In some embodiments, the glass fibers exert a pre-stress on the inner tube 10 in a stepwise decreasing manner, and the glass fiber layers wound on the outer side of the inner tube 10 have twelve layers, and the pre-stress of the first layer of glass fibers is 45 Mpa. Fig. 2 shows the pre-stress condition of each layer of the composite material layer 20 in the winding process, and the performance stability of the composite material layer can be ensured according to the pre-stress winding shown in fig. 2. It is understood that the number of layers of the composite material layer 20 and the corresponding pre-stress are not limited thereto, and 8, 10 or 16 layers may be wound on the outer side of the inner tube 10, and the pre-stress applied by the glass fiber may be gradually decreased layer by layer and meet the strength requirement.

As an embodiment of the present invention, the glass fiber is hoop-wound on the circumferential outer side of the inner pipe 10 at a winding angle θ of not more than 15 ° (shown in fig. 4). Preferably, the winding angle is 13 degrees, glass fibers are laid according to the winding angle, and the glass fibers are carefully laid on the outer side of the inner tube 10, so that a good composite material layer is formed, namely, good wear resistance is ensured.

In the invention, the glass fiber containing the epoxy resin is wound on the inner tube 10 to form the glass fiber composite material, and then the glass fiber composite material is subjected to rotary curing molding, wherein the curing temperature is 60 ℃, and the curing time is 120 min. After the winding of the composite material layer 20 outside the inner part and the outer part 10 is finished, the composite material layer is in a liquid state at normal temperature, the composite material layer needs to be cured at a temperature higher than the normal temperature to form a complete composite material layer with certain strength, and after the curing temperature of 60 ℃ and the curing time of 120min, the composite material layer 20 is cured and formed to form the corrosion-resistant layer.

As an embodiment of the present invention, the glass fiber accounts for not less than 80% of the volume of the composite material layer 20. Preferably, the glass fiber accounts for 85% of the composite material layer 20 by volume, so that the corrosion-resistant pipe is higher in strength and more excellent in corrosion resistance.

In some embodiments, the thickness ratio of the inner pipe 10 to the composite material layer 20 is 1:1.2, and the composite material layer 20 has good strength and corrosion resistance, so that a thicker rubber lining layer is not required to be configured in the conventional technology, the volume of a pipeline in a limestone wet desulphurization system is effectively reduced, and the convenience of pipeline construction is improved. As an embodiment of the present invention, the thickness of the composite material layer 20 is 2-5mm, and preferably, the thickness of the composite material layer 20 is 3mm, so that the volume of a pipeline in a limestone wet desulphurization system is effectively reduced, and the convenience of pipeline construction is improved.

Meanwhile, the invention also discloses a forming method of the corrosion-resistant pipeline, which comprises the following steps:

s1, fixing the inner tube 10 on a winding device by an internal expanding mandrel, and driving the inner tube 10 to rotate by the winding device;

specifically, the inner expanding mandrel is mounted on the inner wall of the inner tube 10, and one end of the inner expanding mandrel is fixed to the three-jaw chuck 30 of the winding apparatus 100, as shown in fig. 3, and the other end thereof is supported by the tailstock 4 of the winding apparatus 100. The winding device is driven by the servo motor to rotate, namely, the inner pipe 10 is driven to rotate; moreover, the winding device 100 further comprises a moving trolley 50, which is arranged on one side of the bed body of the winding device 100 and is arranged on a ball screw through a slide block, and the ball screw is driven by another servo motor to drive the moving trolley 50 to move linearly along the ball screw; the moving trolley 50 is provided with a glass fiber roll 60, a glue solution thermostat 70 and a pressure roller 80, the glass fiber roll 60 passes through the glue solution thermostat 70 and is guided to the circumferential outer side of the inner tube 10 by the pressure roller 80, as shown in fig. 4, in the winding process, the moving trolley 50 drives the glass fiber to move linearly along the axial direction of the inner tube 10 while the inner tube 10 rotates, so as to complete the circumferential winding of the glass fiber. Fig. 3 and 4 are schematic illustrations of the structure of the winding apparatus, and it is understood that the wet winding of the glass fiber can be performed in this manner. Fig. 4 is a schematic diagram of the winding of glass fibers, a glass fiber roll 60, a glue solution thermostat 70 and a wire-pressing wheel are all arranged on the mobile small side 50.

The inner tube 10 is rotated at a speed of 80-120rpm during the winding process, so that the composition of the epoxy resin and the curing agent is effectively prevented from being sputtered to the peripheral side of the winding apparatus by centrifugal force during the winding process, thereby preventing the influence on the normal winding operation of the inner tube.

S2, overlapping glass fiber at the end of the inner tube 10, soaking the glass fiber in epoxy resin, and winding the glass fiber containing the epoxy resin to the circumferential outer side of the inner tube 10;

specifically, a composition formed by epoxy resin and a curing agent is placed in a glue solution constant temperature device 70, and a constant temperature device is arranged outside the glue solution constant temperature device 70, so that the composition configured by the epoxy resin and the curing agent is controlled within a constant temperature range, the stability of the performance of the configured composition is ensured, and the stability of the characteristics of the composite material formed by winding is improved.

S3, placing the assembly formed by the inner pipe 10 and the composite material layer 20 in a curing device for curing;

specifically, the curing process temperature of the composite material is 60 ℃, and the curing time is 120 min; to prevent the composition of the epoxy resin and the curing agent from accumulating under gravity on the underside of the inner tube 10 during the curing process, the inner tube 10 and the composite layer 20 need to rotate at a certain speed about the axis of the inner tube 10 during the curing process to improve the relative uniformity of the composite layer 20 outside the corrosion resistant pipe.

And S4, removing the internal expanding mandrel.

And finally, after the corrosion-resistant pipeline is solidified and formed, the system can be installed and used in a limestone wet desulphurization system only by dismantling the internal expansion core shaft so as to improve the corrosion resistance of the pipeline of the system.

Compared with the defects and shortcomings of the prior art, the corrosion-resistant pipeline and the forming method thereof provided by the invention are suitable for a limestone wet desulphurization system, have reasonable structure and reliable use, are widely applied to pipelines through which limestone slurry flows, effectively prevent the corrosion of the pipelines, ensure the strength of the pipelines, prolong the service life of the pipelines in the limestone wet desulphurization system, improve the running stability of the wet desulphurization system and have good popularization value.

The present invention is not limited to the above embodiments, and any other products in various forms can be obtained by the teaching of the present invention, but any changes in the shape or structure thereof, which are the same as or similar to the technical solutions of the present invention, fall within the protection scope of the present invention.