A method for repairing a high-pressure pipeline of a compressed air energy storage system

Abstract

The application discloses a kind of repair methods of compressed air energy storage system high-pressure pipeline, mainly related to pipeline repair technical field;Including steps: S1, polishing the end face of front pipe section and rear pipe section;S2, measure the relevant size of front pipe section and rear pipe section;S3, according to the size measured in step S2, make prefabricated pipe section;S4, the prefabricated pipe section is placed between front pipe section and rear pipe section;S5, adjust the length of prefabricated pipe section;S6, wrap the heat insulation layer on prefabricated pipe section;S7, weld two first arc-shaped steel plates between front outer steel pipe and rear outer steel pipe;S8, one end of two second arc-shaped steel plates is welded on front outer steel pipe, and the other end is welded on rear outer steel pipe;The application can quickly complete the repair of inner lining pipe and outer steel pipe for the damaged part of high-pressure pipeline, and can also reduce the influence of repair position on internal medium transmission as far as possible.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipeline repair, in particular to a repair method for a compressed air energy storage system high-pressure pipeline. BACKGROUND

[0002] The compressed air in the compressed air energy storage system high-pressure pipeline inevitably causes impact on the inner wall of the pipeline, especially the gas impact force at the turning of the high-pressure pipeline is larger, and the high-pressure pipeline used by the compressed air energy storage system is generally composed of a steel pipe and an inner liner pipe arranged in the steel pipe, the material of the inner liner pipe is often epoxy resin, the impact of the compressed air can cause the inner wall of the inner liner pipe to wear, locally thin and other problems, at the same time, the outer steel pipe can also be broken due to some unexpected conditions, therefore, the repair of the high-pressure pipeline has always been a problem in the maintenance of the compressed air energy storage system.

[0003] At present, when repairing the inner wall of the high-pressure pipeline, various repair devices are often carried by a pipeline robot to complete the repair of the inner wall of the pipeline, but in some high-pressure pipelines, no interface is reserved for the pipeline robot to enter, so it is necessary to cut off a length of the pipeline, send the pipeline robot into the main pipeline, and after the inner wall of the pipeline is repaired, the damaged part caused by cutting off also needs to be repaired; in addition, for some seriously damaged pipeline parts, the repair is also completed by cutting off the whole pipeline and replacing it. However, for the high-pressure pipeline with an inner liner pipe used by the compressed air energy storage system, the repair of the damaged part not only needs to consider the repair of the outer steel pipe, but also needs to consider the repair of the inner liner pipe, which leads to the fact that the traditional welding repair method is completely unsuitable, therefore, a repair method for the compressed air energy storage system high-pressure pipeline is urgently needed. SUMMARY

[0004] The present application aims to solve the problems in the prior art, and provides a repair method for a compressed air energy storage system high-pressure pipeline, which can quickly repair the inner liner pipe and the outer steel pipe for the damaged part, and also can reduce the influence of the repair position on the internal medium transportation as much as possible.

[0005] To achieve the above-mentioned purpose, the present application realizes the following technical scheme:

[0006] A repair method for a compressed air energy storage system high-pressure pipeline, comprising the steps of:

[0007] S1, polishing the rear end face of the front pipe section on the front side of the damaged part and the front end face of the rear pipe section on the rear side of the damaged part, cutting off a part of the rear end of the front outer steel pipe of the front pipe section, making the rear end of the front inner liner pipe of the front pipe section protrude out of the front outer steel pipe and processing a chamfer on the outer wall of the rear end of the front inner liner pipe, and processing a chamfer on the inner wall of the front end of the rear inner liner pipe of the rear pipe section;

[0008] S2, measuring the inner diameter of the front and rear inner liners, the outer diameter of the front and rear inner liners, the distance between the front and rear inner liners, and the size of the chamfer on the front and rear inner liners;

[0009] S3, according to the sizes measured in step S2, a prefabricated pipe segment is made, the length of the prefabricated pipe segment is adjustable, and the minimum length of the prefabricated pipe segment is less than the distance between the front and rear inner liners, and the maximum length is not less than the distance between the front and rear inner liners;

[0010] S4, after adjusting the prefabricated pipe segment to the minimum length, epoxy resin glue is applied to the rear end of the front inner liner and the rear end of the prefabricated pipe segment, then the prefabricated pipe segment is placed between the front and rear pipe segments, and a bracket is used to support the prefabricated pipe segment;

[0011] S5, the length of the prefabricated pipe segment is adjusted so that the front end of the prefabricated pipe segment is in close contact with the front pipe segment, and the rear end of the prefabricated pipe segment is in close contact with the rear pipe segment, and then it is left to stand for more than half an hour;

[0012] S6, wrapping a thermal insulation layer on the prefabricated pipe segment;

[0013] S7, according to the distance between the front and rear outer steel pipes, two first arc-shaped steel plates are made, the two first arc-shaped steel plates form a cylinder, and the two first arc-shaped steel plates are welded between the front and rear outer steel pipes;

[0014] S8, two second arc-shaped steel plates are made, the length of each of the two second arc-shaped steel plates is greater than the distance between the front and rear outer steel pipes, the two second arc-shaped steel plates form a cylinder, one end of the second arc-shaped steel plate is welded to the front outer steel pipe, and the other end is welded to the rear outer steel pipe.

[0015] Preferably, in step S3, a chamfer is machined on the inner wall of the front end of the prefabricated pipe segment and on the outer wall of the rear end of the prefabricated pipe segment.

[0016] Preferably, in step S5, when adjusting the prefabricated pipe segment, ensure that the chamfered part of the front inner liner is inserted into the prefabricated pipe segment, and the chamfered part of the rear end of the prefabricated pipe segment is inserted into the rear inner liner.

[0017] Preferably, in step S4, epoxy resin glue is applied to the rear end face of the front inner liner, the chamfer of the rear end of the front inner liner, the rear end face of the prefabricated pipe segment, and the chamfer of the rear end of the prefabricated pipe segment.

[0018] Preferably, in step S3, the prefabricated pipe section comprises a front connecting pipe and a rear connecting pipe arranged at the rear end of the front connecting pipe, and a chamfer is formed on the inner wall of the front end of the front connecting pipe and the outer wall of the rear end of the rear connecting pipe, an external thread is formed on the rear end of the front connecting pipe, and an internal thread corresponding to the external thread is formed on the front end of the rear connecting pipe, the inner diameter of the front connecting pipe is the same as that of the front inner lining pipe, and the inner diameter of the rear connecting pipe is the same as that of the rear inner lining pipe.

[0019] Preferably, in step S5, after the length of the prefabricated pipe section is adjusted, epoxy resin glue is filled into the gap between the front connecting pipe and the rear connecting pipe of the prefabricated pipe section.

[0020] Preferably, in step S3, a rotating handle is prefabricated on the outer wall of the front connecting pipe and the rear connecting pipe when the prefabricated pipe section is made, and the rotating handle is cut off after the length of the prefabricated pipe section is adjusted in step S5.

[0021] Preferably, in step S3, the prefabricated pipe section is made of epoxy resin material.

[0022] Preferably, the chamfer on the prefabricated pipe section, the front inner lining pipe and the rear inner lining pipe has a cutting depth less than the wall thickness.

[0023] Preferably, the bracket in step S4 is a height-adjustable bracket.

[0024] Compared with the prior art, the present application has the following beneficial effects:

[0025] The present application can quickly complete the repair work of the damaged part of the high-pressure pipeline of the compressed air energy storage system. For the damaged part, the inner lining pipe is repaired first, then the outer steel pipe is repaired, and finally the reinforced steel pipe is welded. In this way, the repair of the inner lining pipe and the outer steel pipe can be quickly completed, the structural strength of the repaired position is ensured, and the influence of the repaired position on the internal medium is also reduced as much as possible. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a repair schematic diagram of the present application;

[0027] Figure 2 is a schematic diagram of a damaged pipeline;

[0028] Figure 3 is a schematic diagram of the front pipe section and the rear pipe section after processing in step S1;

[0029] Figure 4 is a schematic diagram of the prefabricated pipe section after adjustment in step S5;

[0030] Figure 5 is a schematic diagram of the prefabricated pipe section after wrapping the heat insulation layer in step S6;

[0031] Figure 6is a schematic diagram after welding the two first curved steel plates in step S7;

[0032] Figure 7 Schematic diagram of the structure of the prefabricated pipe section in step S3.

[0033] The numbers shown in the accompanying drawings are: 1. front pipe section; 11. front external steel pipe; 12. front inner lining pipe; 2. defective part; 3. rear pipe section; 31. rear external steel pipe; 32. rear inner lining pipe; 4. prefabricated pipe section; 41. front connecting pipe; 42. rear connecting pipe; 43. epoxy resin glue; 5. thermal insulation layer; 6. first curved steel plate; 7. second curved steel plate. DETAILED DESCRIPTION

[0034] Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiments are only used to illustrate the present invention and are not used in limiting the scope of the present invention.In addition, should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the application equally.

[0035] As attached Figure 2 As shown, on the high-pressure pipeline of the compressed air energy storage system, a defective portion 2 is formed on the high-pressure pipeline due to the production of the pipeline robot inlet and outlet or the removal of the severely damaged pipeline portion. The pipeline in front of the defective portion 2 is named the front pipe section 1, and the pipeline behind the defective portion 2 is named the rear pipe section 3. The internal medium is transported from front to rear in the pipeline. In order to repair the defective portion, the present invention provides a method for repairing the high-pressure pipeline of the compressed air energy storage system.

[0036] Embodiment: The present invention is a method for repairing a high-pressure pipeline of a compressed air energy storage system, comprising the following steps:

[0037] S1. Grind the rear end face of the front pipe section 1 on the front side of the defective part 2 and the front end face of the rear pipe section 3 on the rear side of the defective part 2 to make them smooth, cut off a part of the rear end of the front external steel pipe 11 of the front pipe section 1, and cut off a length that is twice the wall thickness of the front inner lining pipe 12, so that the rear end of the front inner lining pipe 12 of the front pipe section 1 extends out of the front external steel pipe 11 and chamfer the outer wall of the rear end of the front inner lining pipe 12, and chamfer the inner wall of the front end of the rear inner lining pipe 32 of the rear pipe section 3, as shown in the attached figure. Figure 3 shown.

[0038] S2. Measure the inner diameter of the front liner tube 12 and the rear liner tube 32, the outer diameter of the front liner tube 12 and the rear liner tube 32, the distance between the front liner tube 12 and the rear liner tube 32, and the size of the chamfers on the front liner tube 12 and the rear liner tube 32.

[0039] S3. According to the dimensions measured in step S2, a prefabricated pipe section 4 is manufactured. The length of the prefabricated pipe section 4 is adjustable, and the minimum length of the prefabricated pipe section 4 is less than the distance between the front liner tube 12 and the rear liner tube 32, and the maximum length is not less than the distance between the front liner tube 12 and the rear liner tube 32.

[0040] S4. After adjusting the prefabricated pipe section 4 to the minimum length, apply epoxy resin glue to the rear end of the front lining pipe 12 and the rear end of the prefabricated pipe section 4, then place the prefabricated pipe section 4 between the front pipe section 1 and the rear pipe section 3, and use a bracket to provide support for the prefabricated pipe section 4.

[0041] S5, as attached Figure 4 As shown, the length of the prefabricated pipe section 4 is adjusted so that the front end of the prefabricated pipe section 4 is in close contact with the front pipe section 1 and the rear end of the prefabricated pipe section 4 is in close contact with the rear pipe section 3, and then left to stand for more than half an hour.

[0042] S6, as attached Figure 5 As shown, a heat insulation layer 5 is wrapped around the prefabricated pipe section 4 to prevent the prefabricated pipe section 4 from being deformed due to the heat generated by subsequent welding.

[0043] S7. According to the distance between the front outer steel tube 11 and the rear outer steel tube 31, make two first curved steel plates 6. The two first curved steel plates 6 form a cylinder. The cylinder formed by the two first curved steel plates 6 is used as the repaired outer steel tube. The two first curved steel plates 6 are welded between the front outer steel tube 11 and the rear outer steel tube 31. Figure 6 shown.

[0044] S8. Make two second curved steel plates 7. The length of the two second curved steel plates 7 is greater than the distance between the front external steel tube 11 and the rear external steel tube 31. The two second curved steel plates 7 form a cylinder. The cylinder formed by the two second curved steel plates 7 is used as a reinforcing steel tube to improve the structural strength. One end of the second curved steel plate 7 is welded to the front external steel tube 11, and the other end is welded to the rear external steel tube 31. Figure 1 shown.

[0045] Preferably, in step S3, chamfers are processed on the inner wall of the front end of the prefabricated pipe segment 4 and the outer wall of the rear end of the prefabricated pipe segment 4. The presence of the chamfers can provide guidance for the installation of the prefabricated pipe segment 4 and can also increase the contact area between the prefabricated pipe segment 4 and the front lining pipe 12 and the rear lining pipe 32.

[0046] Preferably, in step S5, when adjusting the prefabricated pipe segment 4, ensure that the chamfered portion of the front liner 12 is inserted into the prefabricated pipe segment 4, and the chamfered portion of the rear end of the prefabricated pipe segment 4 is inserted into the rear liner 32. The chamfer is used to provide guidance for the prefabricated pipe segment 4 to ensure the coaxiality of the installation of the prefabricated pipe segment 4.

[0047] Preferably, in step S4, epoxy resin glue is applied to the rear end face of the front lining pipe 12, the chamfer of the rear end of the front lining pipe 12, the rear end face of the prefabricated pipe section 4, and the chamfer of the rear end of the prefabricated pipe section 4. The chamfer is used to increase the application area of ​​the epoxy resin glue to ensure the tightness of the connection between the prefabricated pipe section 4 and the front lining pipe 12 and the rear lining pipe 32.

[0048] Preferably, as attached Figure 7 As shown, in step S3, the prefabricated pipe section 4 includes a front connecting pipe 41 and a rear connecting pipe 42 arranged at the rear end of the front connecting pipe 41. The inner wall of the front end of the front connecting pipe 41 and the outer wall of the rear end of the rear connecting pipe 42 are both processed with chamfers, the rear end of the front connecting pipe 41 is processed with an external thread, and the front end of the rear connecting pipe 42 is processed with an internal thread adapted to the external thread. The rear end of the front connecting pipe 41 is threadedly connected to the front end of the rear connecting pipe 42. The front connecting pipe 41 or the rear connecting pipe 42 can be adjusted by rotating the front connecting pipe 41 or the rear connecting pipe 42. The length of the prefabricated pipe section 4, the inner diameter of the front connecting pipe 41 is the same as the inner diameter of the front liner pipe 12, the inner diameter of the rear connecting pipe 42 is the same as the inner diameter of the rear liner pipe 32, the inner diameter of the front connecting pipe 41 is also the same as the inner diameter of the rear connecting pipe 42. When processing the external thread at the rear end of the front connecting pipe 41, it is necessary to turn off a part of the outer wall of the rear end of the front connecting pipe 41 before processing the external thread; when processing the internal thread at the front end of the rear connecting pipe 42, it is also necessary to turn off a part of the inner wall of the rear connecting pipe 42 before processing the internal thread.

[0049] In addition, the presence of the chamfer allows the front liner pipe 12 to be inserted into the front connecting pipe 41, the front connecting pipe 41 to be inserted into the rear connecting pipe 42, and the rear connecting pipe 42 to be inserted into the rear liner pipe 32. The insertion direction is the same as the flow direction of the medium inside the high-pressure pipeline. At the same time, the inner diameters of the front liner pipe 12, the front connecting pipe 41, the rear connecting pipe 42, and the rear liner pipe 32 are the same, so that the internal medium in the high-pressure pipeline can be transported unimpeded.

[0050] Preferably, in step S5, after the length of the prefabricated pipe section 4 is adjusted, the gap formed by the front connecting tube 41 and the rear connecting tube 42 on the outer wall of the prefabricated pipe section 4 is filled with epoxy resin glue 43. On the one hand, this is to reduce the gap on the outer wall of the prefabricated pipe section 4, and on the other hand, it is to prevent the front connecting tube 41 and the rear connecting tube 42 from rotating relative to each other due to vibration of the prefabricated pipe section 4, thereby ensuring the firmness of the bonding of the prefabricated pipe section 4.

[0051] Preferably, in step S3, when making the prefabricated pipe section 4, a rotating handle is prefabricated on the outer wall of the front connecting tube 41 and the rear connecting tube 42. By holding the rotating handle and rotating it, the front connecting tube 41 and the rear connecting tube 42 can be driven to rotate relative to each other, thereby adjusting the length of the prefabricated pipe section 4. In step S5, after the length of the prefabricated pipe section 4 is adjusted, the rotating handle is cut off.

[0052] Preferably, in step S3, the prefabricated pipe section 4 is made of epoxy resin material, and the same material as the inner lining pipe.

[0053] Preferably, the cutting depth of the chamfer on the prefabricated pipe section 4, the front inner lining pipe 12 and the rear inner lining pipe 32 is less than the wall thickness, so that the front and rear ends of the prefabricated pipe section 4, the rear end of the front inner lining pipe 12 and the front end of the rear inner lining pipe 32 are in the form of annular surface, conical surface and annular surface arranged in sequence from inside to outside, thereby increasing the contact surface between the prefabricated pipe section 4 and the front inner lining pipe 12 and the rear inner lining pipe 32.

[0054] Preferably, the bracket in step S4 is a height-adjustable bracket, which can adjust the height of the bracket according to the actual needs, and ensure the stability of the support.

Claims

1. A method for repairing a high-pressure pipeline of a compressed air energy storage system, characterized in that: Including steps: S1. Grind the rear end surface of the front pipe section on the front side of the defect and the front end surface of the rear pipe section on the rear side of the defect smooth, cut off a portion of the rear end of the front external steel pipe of the front pipe section, make the rear end of the front inner liner pipe of the front pipe section extend out of the front external steel pipe, chamfer the outer wall of the rear end of the front inner liner pipe, and chamfer the inner wall of the front end of the rear inner liner pipe of the rear pipe section; S2. Measure the inner diameters of the front liner tube and the rear liner tube, the outer diameters of the front liner tube and the rear liner tube, the distance between the front liner tube and the rear liner tube, and the dimensions of the chamfers on the front liner tube and the rear liner tube; S3. According to the dimensions measured in step S2, a prefabricated pipe segment is manufactured. The length of the prefabricated pipe segment is adjustable, and the minimum length of the prefabricated pipe segment is less than the distance between the front inner liner pipe and the rear inner liner pipe, and the maximum length is not less than the distance between the front inner liner pipe and the rear inner liner pipe; S4. After adjusting the prefabricated pipe section to the minimum length, apply epoxy resin glue to the rear end of the front liner pipe and the rear end of the prefabricated pipe section, then place the prefabricated pipe section between the front pipe section and the rear pipe section, and use a bracket to provide support for the prefabricated pipe section; S5. Adjust the length of the prefabricated pipe section so that the front end of the prefabricated pipe section is in close contact with the front pipe section, and the rear end of the prefabricated pipe section is in close contact with the rear pipe section, and then let it stand for more than half an hour; S6. Wrapping the prefabricated pipe section with a thermal insulation layer; S7. According to the distance between the front outer steel tube and the rear outer steel tube, two first curved steel plates are manufactured. The two first curved steel plates are formed into a cylinder. The two first curved steel plates are welded between the front outer steel tube and the rear outer steel tube. S8. Make two second curved steel plates. The lengths of the two second curved steel plates are both greater than the distance between the front external steel tube and the rear external steel tube. The two second curved steel plates form a cylinder. Weld one end of the second curved steel plate to the front external steel tube and the other end to the rear external steel tube.

2. A method for repairing a high-pressure pipeline of a compressed air energy storage system according to claim 1, characterized in that: In step S3, chamfers are processed on the inner wall of the front end of the prefabricated pipe section and the outer wall of the rear end of the prefabricated pipe section.

3. A method for repairing a high-pressure pipeline of a compressed air energy storage system according to claim 2, characterized in that: In step S5, when adjusting the prefabricated pipe section, ensure that the chamfered portion of the front liner pipe is inserted into the prefabricated pipe section, and the chamfered portion of the rear end of the prefabricated pipe section is inserted into the rear liner pipe.

4. A method for repairing a high-pressure pipeline of a compressed air energy storage system according to claim 3, characterized in that: In step S4, epoxy resin glue is applied to the rear end face of the front inner lining pipe, the chamfer of the rear end of the front inner lining pipe, the rear end face of the prefabricated pipe section, and the chamfer of the rear end of the prefabricated pipe section.

5. The method for repairing a high-pressure pipeline of a compressed air energy storage system according to claim 1, characterized in that: In step S3, the prefabricated pipe section includes a front connecting pipe and a rear connecting pipe arranged at the rear end of the front connecting pipe. Chamfers are processed on the inner wall of the front end of the front connecting pipe and the outer wall of the rear end of the rear connecting pipe. An external thread is processed at the rear end of the front connecting pipe, and an internal thread adapted to the external thread is processed at the front end of the rear connecting pipe. The inner diameter of the front connecting pipe is the same as the inner diameter of the front lining pipe, and the inner diameter of the rear connecting pipe is the same as the inner diameter of the rear lining pipe.

6. A method for repairing a high-pressure pipeline of a compressed air energy storage system according to claim 5, characterized in that: In step S5, after the length of the prefabricated pipe section is adjusted, epoxy resin glue is filled in the gap formed by the front connecting pipe and the rear connecting pipe on the prefabricated pipe section.

7. The method for repairing a high-pressure pipeline of a compressed air energy storage system according to claim 5, characterized in that: In step S3, when manufacturing the prefabricated pipe section, a rotating handle is prefabricated on the outer wall of the front connecting pipe and the rear connecting pipe. In step S5, after the length of the prefabricated pipe section is adjusted, the rotating handle is cut off.

8. The method for repairing a high-pressure pipeline of a compressed air energy storage system according to claim 5, characterized in that: In step S3, the prefabricated pipe section is made of epoxy resin.

9. The method for repairing a high-pressure pipeline of a compressed air energy storage system according to claim 1, characterized in that: The cutting depth of the chamfers on the prefabricated pipe section, the front liner pipe and the rear liner pipe is less than their wall thickness.

10. The method for repairing a high-pressure pipeline of a compressed air energy storage system according to claim 1, characterized in that: The bracket in step S4 is a height-adjustable bracket.

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