Safety evaluation method for pipelines within the scope of power station boilers

Abstract

The present invention discloses a pipeline safety evaluation method within the scope of a power plant boiler, which relates to the field of pipeline safety evaluation. In order to solve the problem that the current detection devices used for safety evaluation are diversified, different detection devices are required to conduct step-by-step detection for comprehensive evaluation, and the detection structure analysis and organization are required to comprehensively obtain the safety data of the pipeline. The operation is highly professional, the operation time is long, the operation procedures are complicated, and the work efficiency is not high enough. The pipeline safety evaluation method is implemented based on a pipeline safety detection device, which is located in the detection pipeline. The pipeline safety detection device includes an intermediate box, and connecting pipes are installed on both sides of the intermediate box. The rear ends of the upper ends of both sides of the intermediate box are installed with inflation tubes. The other end of the connecting pipe on one side is connected to a first sealing assembly, and the other end of the connecting pipe on the other side is connected to a second sealing assembly. The first sealing assembly and the second sealing assembly have the same structure.

Description

Technical Field

[0001] The present invention relates to the field of pipeline safety evaluation, and in particular to a pipeline safety evaluation method within a power station boiler. Background Art

[0002] A power plant boiler, in layman's terms, is a boiler used to generate electricity in a power plant. The structural type of a power plant boiler depends primarily on factors such as fuel characteristics, boiler capacity, and steam parameters. Common types include inverted U-type, tower-type, and box-type. The inverted U-type is suitable for boilers of various capacities and fuels. It is lower in height than other boiler types, making heating surface layout more convenient, but it occupies a larger area. The tower-type is suitable for boilers burning ash-rich bituminous coal and lignite. It lacks flue turns, which reduces localized wear on heating surfaces caused by fly ash and occupies a smaller area, but its height makes installation and maintenance more complex. The box-type is suitable for larger oil and gas boilers. Its compact structure and small footprint make connection between the boiler and the steam turbine easier, but its manufacturing process is more complex and maintenance is difficult. The "water wall," "superheater tubes," "reheater tubes," and "economizer tubes" constitute the "four tubes" of a power plant boiler.

[0003] Long-term operation of boiler steam pipes under high temperature and high pressure can lead to alloy element redistribution, carbide aggregation, and grain boundary precipitation. This can cause changes in composition and structure, forming creep voids and causing creep damage. This can reduce the thermal strength of heat-resistant steel and potentially cause steam pipe failure, directly impacting the safety of power plant furnaces. Consequently, significant attention has been paid to the safety assessment of high-temperature components in power plant boilers in recent years.

[0004] It is necessary to evaluate the safety of the pipeline, mainly to check whether there are damaged cracks or even damaged holes in the pipeline, and to check whether the internal space of the pipeline has become smaller due to impurity blockage or larger due to inner wall corrosion. Currently, there are various detection devices used for safety evaluation. In order to conduct a comprehensive evaluation, different detection devices are needed for step-by-step detection, and the detection structure must be analyzed and sorted out to fully obtain the safety data of the pipeline. The operation requires high professionalism, long operation time, multiple operation procedures, and low work efficiency. Summary of the Invention

[0005] The purpose of the present invention is to provide a pipeline safety evaluation method within the scope of a power plant boiler, so as to solve the problems raised in the above-mentioned background technology that the current detection devices used for safety evaluation are diverse. In order to achieve a comprehensive evaluation, different detection devices are needed for step-by-step detection, and the detection structure analysis and organization are required to comprehensively obtain the safety data of the pipeline. The operation requires high professionalism, long operation time, multiple operation procedures, and low work efficiency.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a pipeline safety evaluation method within the scope of a power plant boiler, the pipeline safety evaluation method is implemented based on a pipeline safety detection device, the pipeline safety detection device is located in the detection pipeline, the pipeline safety detection device includes an intermediate box body, connecting pipes are installed on both sides of the intermediate box body, the inner ends of the connecting pipes extend to the interior of the intermediate box body, and the rear ends of the upper ends of both sides of the intermediate box body are installed with inflation pipes, the inner ends of the inflation pipes extend to the interior of the intermediate box body, the other end of the connecting pipe on one side is connected to a first sealing component, and the other end of the connecting pipe on the other side is connected to a second sealing component, the first sealing component and the second sealing component have the same structure, the first sealing component and the second sealing component are both composed of an intermediate support and a sealing airbag, the sealing airbag is located in the middle of the outside of the intermediate support, a detection space is formed between the first sealing component and the second sealing component along the inner side of the detection pipeline, and a first pressure monitoring probe is installed on the second sealing component. and a second pressure monitoring probe, the first pressure monitoring probe continuously monitors the pressure inside the sealed airbag, and the second pressure monitoring probe continuously monitors the pressure inside the detection space, wherein an inner airbag is provided on one side of the intermediate box body, and an inflation pipe on the inner airbag passes through the intermediate box body and extends to the outside of the intermediate box body. A first delivery pump is installed on the other side of the intermediate box body, an input end of the first delivery pump is connected to a first air bleed pipe, and the other end of the first air bleed pipe extends to the interior of the inner airbag, an output end of the first delivery pump is connected to the first air supply pipe, a first control valve is installed on the first air supply pipe, and a first connecting tee is installed at the other end of the first air supply pipe, the inner ends of the two inflation pipes are respectively connected to the two ports on the first connecting tee, the first air supply pipe is fixed along the inner end of the first control valve and is internally connected to a gas supply branch pipe, the gas supply branch pipe is installed with a second control valve, a second connecting tee is installed at the other end of the gas supply branch pipe, and the inner ends of the two connecting pipes are respectively connected to the two ports on the second connecting tee;

[0007] The pipeline safety assessment method comprises the following steps:

[0008] Step 1: The first control valve is closed, the second control valve is opened, and the first delivery pump extracts gas from the inner airbag through the first air duct and delivers the gas to the sealed airbag through the first air delivery pipe, the air delivery branch pipe, the second connecting tee pipe and the connecting pipe until the sealed airbag is fully inflated and the detection space is sealed;

[0009] Step 2: The first control valve is opened, the second control valve is closed, and the first delivery pump extracts gas from the inner airbag through the first air duct and delivers the gas to the detection space through the first air delivery pipe, the first connecting tee pipe and the inflation pipe;

[0010] Step 3: The first pressure monitoring probe continuously monitors the pressure in the sealed airbag, and the second pressure monitoring probe continuously monitors the pressure in the detection space;

[0011] Step 4: If the pressure in the monitoring detection space continues to decrease and the pressure in the sealed airbag remains unchanged, it means that a gap that penetrates the inside and outside of the detection pipe wall in the space where the device is located has appeared;

[0012] Step 5: If the pressure in the monitoring detection space decreases rapidly and the pressure in the sealed airbag remains unchanged, it means that a damage hole that penetrates the inside and outside of the detection pipe wall in the space where the device is located has appeared;

[0013] Step 6: If the pressure in the monitoring detection space decreases or increases and then remains stable, and the pressure in the sealed airbag remains unchanged, it means that the detection pipe wall in the space where the device is located is corroded or has impurities attached;

[0014] Step 7: When the situations shown in steps 4, 5 and 6 occur, the safety evaluation index of the detection pipeline is low.

[0015] Preferably, the intermediate supporting member includes an outer fixing plate and an inner fixing column, the outer fixing plate is integrally connected to both sides of the inner fixing column, the connection position between the outer fixing plate and the inner fixing column is set to be arc-shaped, and an annular groove is formed between the two outer fixing plates along the outside of the inner fixing column, and the sealing airbag is located in the annular groove.

[0016] Preferably, a first slot is provided in the middle of the outer fixed plate on the inner side of each group, a second slot is provided on the inner fixed column, a channel connecting the first slot and the second slot is provided in the middle supporting member, the first slot is connected to the inside of the connecting pipe, the inflation port of the sealing airbag is fixed in the second slot, and the sealing airbag is connected to the inside of the second slot.

[0017] Preferably, a third fixed seat is welded and fixed in the middle of the front and rear ends of the intermediate box body, and the first driving rotating rod is connected to the third fixed seat by means of an axis rotation, and the other end of the first driving rotating rod is connected to the second driving rotating rod by means of an axis rotation, and a fourth fixed seat is welded and fixed to one side of the front and rear ends of the intermediate box body, and the second driving cylinder is connected to the fourth fixed seat by means of an axis rotation, and the output rod end of the second driving cylinder is connected to the fifth fixed seat by means of an axis rotation, and the fifth fixed seat is welded and fixed to one side of the first driving rotating rod, and a sixth fixed seat is welded and fixed to the other side of the front and rear ends of the intermediate box body, and the third driving cylinder is connected to the sixth fixed seat by means of an axis rotation, and the output rod end of the third driving cylinder is connected to the seventh fixed seat by means of an axis rotation, and the seventh fixed seat is welded and fixed to the other side of the second driving rotating rod.

[0018] Preferably, a rubber connecting block is fixed to the other end of the second driving rotating rod, the outer end of the rubber connecting block is connected to the adsorption plate, and an air intake hose is installed on the inner end of the adsorption plate along one side of the rubber connecting block, and the air intake hose is connected to the inside of the adsorption plate.

[0019] Preferably, a second delivery pump is also installed inside the intermediate box body, and a second air bleed pipe is installed at the input end of the second delivery pump, and the other end of the second air bleed pipe extends to the interior of the inner airbag, and a second air delivery pipe is installed at the output end of the second delivery pump, and the other end of the second air delivery pipe is internally connected to a third connecting tee, and the other two ends of the third connecting tee are respectively connected to the other ends of the two intake hoses.

[0020] Preferably, a first fixed seat is welded and fixed on both sides of the upper and lower ends of the intermediate box body, a rotating adjustment rod is connected to the first fixed seat through an axis, and a movable roller is installed at the other end of the rotating adjustment rod, and the upper wheel body of the movable roller is in contact with the inner wall of the detection pipe.

[0021] Preferably, a first driving cylinder is installed in the middle of the upper and lower ends of the intermediate box body, and the output rod end of the first driving cylinder is connected to the driving adjustment rod through an axial rotation, and the other end of the driving adjustment rod is connected to the second fixed seat through an axial rotation, and the second fixed seat is welded and fixed to the middle of the oblique upper end of the rotating adjustment rod.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. In this invention, the first control valve is closed, the second control valve is opened, and the first delivery pump delivers gas into the sealed airbag, causing the sealed airbag to swell, thereby sealing the detection space; the first control valve is opened, the second control valve is closed, and the first delivery pump delivers gas into the detection space; the first pressure monitoring probe continuously monitors the pressure in the sealed airbag, and the second pressure monitoring probe continuously monitors the pressure in the detection space. If the pressure in the monitoring detection space continues to decrease, while the pressure in the sealed airbag remains unchanged, it indicates that a crack that penetrates the inside and outside of the detection pipe wall in the space where the device is located has appeared; if the pressure in the monitoring detection space decreases rapidly, while the pressure in the sealed airbag remains unchanged, it indicates that a damaged hole that penetrates the inside and outside of the detection pipe wall in the space where the device is located has appeared; if the pressure in the monitoring detection space decreases or remains stable after increasing, while the pressure in the sealed airbag remains unchanged, it indicates that the detection pipe wall in the space where the device is located has been corroded or has impurities adhered to it. It can detect various different situations that may occur on the pipeline in one operation, and comprehensively evaluate the safety of the pipeline through observation of pressure-related situations, which solves the problem that the current detection devices used for safety evaluation are diversified. In order to conduct a comprehensive evaluation, different detection devices are needed to conduct step-by-step detection, and the detection structure must be analyzed and sorted out to comprehensively obtain the safety data of the pipeline. The operation requires high professionalism, long operation time, multiple operation procedures, and low work efficiency.

[0024] 2. In this invention, the output rod of the second driving cylinder extends or contracts to drive the first driving rotating rod to rotate, and the output rod of the third driving cylinder extends or contracts to drive the second driving rotating rod to rotate, thereby driving the adsorption plate to move to a state of being in contact with the wall of the detection pipe. The adsorption plate is adsorbed on the wall of the detection pipe under pressure. In this state, the relevant positions of the sealing airbag and the detection space can be stably sealed, avoiding the influence of the location of the device on the monitoring results during the detection process, thereby improving the accuracy of the safety evaluation.

[0025] 3. In this invention, the output rod of the second drive cylinder extends, driving the first drive rotating rod to move. The output rod of the third drive cylinder then rotates and slightly contracts the second drive rotating rod, pushing the adsorption plate toward the detection pipe. This movement of the adsorption plate toward the detection pipe further enhances the adsorption effect between the adsorption plate and the detection pipe. The drive maintains the adsorption plate stationary while driving the intermediate housing forward in the opposite direction. This achieves actuated movement of the detection-related structures, enabling a comprehensive safety assessment of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a front view of the internal structure of the pipeline safety detection device of the present invention;

[0027] Figure 2 This is an enlarged view of the structure at point A of the present invention;

[0028] Figure 3 A top view of the internal structure of the pipeline safety detection device of the present invention;

[0029] Figure 4 This is an enlarged view of the structure at B of the present invention;

[0030] Figure 5 This is a diagram showing changes in the internal structure of the pipeline safety detection device of the present invention;

[0031] Figure 6 It is a schematic diagram of the three-dimensional structure of the intermediate supporting member of the pipeline safety detection device of the present invention;

[0032] Figure 7 This is a schematic diagram of the internal structure of the intermediate box of the pipeline safety detection device of the present invention.

[0033] In the figure: 1. Detection pipe; 2. Intermediate box; 3. Connecting pipe; 4. First sealing assembly; 5. Second sealing assembly; 6. Intermediate support; 7. Outer fixed plate; 8. Inner fixed column; 9. Annular groove; 10. First slot hole; 11. Second slot hole; 12. Sealing airbag; 13. Detection space; 14. First pressure monitoring probe; 15. Second pressure monitoring probe; 16. Inflating tube; 17. First fixing seat; 18. Rotating adjustment rod; 19. Moving roller; 20. Second fixing seat; 21. Driving adjustment rod; 22. First driving cylinder; 23. Third fixing seat; 24. First driving rotating rod; 25 , second driving rotating rod; 26, rubber connecting block; 27, adsorption plate; 28, air intake hose; 29, fourth fixing seat; 30, second driving cylinder; 31, fifth fixing seat; 32, sixth fixing seat; 33, third driving cylinder; 34, seventh fixing seat; 35, first delivery pump; 36, first air bleed pipe; 37, inner air bag; 38, first air supply pipe; 39, first control valve; 40, first connecting tee; 41, air supply branch pipe; 42, second control valve; 43, second connecting tee; 44, second delivery pump; 45, second air bleed pipe; 46, second air supply pipe; 47, third connecting tee. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0035] See also Figure 1-7, an embodiment provided by the present invention: a pipeline safety evaluation method within the scope of a power plant boiler, the pipeline safety evaluation method is implemented based on a pipeline safety detection device, the pipeline safety detection device is located in a detection pipeline 1, the pipeline safety detection device includes an intermediate box 2, both sides of the intermediate box 2 are equipped with connecting pipes 3, the inner ends of the connecting pipes 3 extend to the interior of the intermediate box 2, the rear ends of the upper ends of both sides of the intermediate box 2 are equipped with inflation pipes 16, the inner ends of the inflation pipes 16 extend to the interior of the intermediate box 2, the other end of the connecting pipe 3 on one side is connected to a first sealing component 4, and the other end of the connecting pipe 3 on the other side is connected to a second sealing component 5, the first sealing component 4 and the second sealing component 5 have the same structure, the first sealing component 4 and the second sealing component 5 are both composed of an intermediate support 6 and a sealing airbag 12, the sealing airbag 12 is located In the middle of the outside of the intermediate supporting member 6, the material of the sealing airbag 12 can be designed with reference to the materials of inflatable boats, lifeboats, etc., so that its own strength and toughness are high; the intermediate supporting member 6 includes an outer fixing plate 7 and an inner fixing column 8, the outer fixing plate 7 is integrally connected to both sides of the inner fixing column 8, the connection position of the outer fixing plate 7 and the inner fixing column 8 is set to an arc shape, and an annular groove 9 is formed between the two outer fixing plates 7 along the outside of the inner fixing column 8, the sealing airbag 12 is located in the annular groove 9, and a first slot hole 10 is opened in the middle of each group of inner outer fixing plates 7, and a second slot hole 11 is opened on the inner fixing column 8. A channel connecting the first slot hole 10 and the second slot hole 11 is provided in the intermediate supporting member 6, and the first slot hole 10 is connected to the inside of the connecting pipe 3. The inflation port of the sealing airbag 12 is fixed in the second slot hole 11, and the sealing airbag 12 is connected to the inside of the second slot hole 11. A detection space 13 is formed between the first sealing component 4 and the second sealing component 5 along the inner side of the detection pipe 1, and a first pressure monitoring probe 14 and a second pressure monitoring probe 15 are installed on the second sealing component 5. The first pressure monitoring probe 14 continuously monitors the pressure in the sealed airbag 12, and the second pressure monitoring probe 15 continuously monitors the pressure in the detection space 13. An inner airbag 37 is provided on one side of the interior of the intermediate box 2, and an inflation tube on the inner airbag 37 extends through the intermediate box 2 to the outside of the intermediate box 2. A first delivery pump 35 is installed on the other side of the interior of the intermediate box 2, and the input end of the first delivery pump 35 is connected to the first air bleed pipe 36. The other end of the first air bleed pipe 36 One end extends into the interior of the inner airbag 37, the output end of the first delivery pump 35 is connected to the first air delivery pipe 38, the first air delivery pipe 38 is installed with a first control valve 39, the other end of the first air delivery pipe 38 is installed with a first connecting tee 40, the inner ends of the two inflation pipes 16 are respectively connected to the two ports on the first connecting tee 40, the first air delivery pipe 38 is fixed along the inner end of the first control valve 39 and is internally connected to a gas delivery branch pipe 41, the gas delivery branch pipe 41 is installed with a second control valve 42, the other end of the gas delivery branch pipe 41 is installed with a second connecting tee 43, the inner ends of the two connecting pipes 3 are respectively connected to the two ports on the second connecting tee 43;

[0036] The pipeline safety assessment method includes the following steps:

[0037] Step 1: The first control valve 39 is closed, the second control valve 42 is opened, and the first delivery pump 35 extracts gas from the inner airbag 37 through the first air bleed pipe 36 and delivers the gas to the sealed airbag 12 through the first air delivery pipe 38, the air delivery branch pipe 41, the second connecting tee pipe 43 and the connecting pipe 3 until the sealed airbag 12 is fully inflated and the detection space 13 is sealed;

[0038] Step 2: The first control valve 39 is opened, the second control valve 42 is closed, and the first delivery pump 35 extracts gas from the inner airbag 37 through the first air duct 36 and delivers the gas to the detection space 13 through the first air delivery pipe 38, the first connecting tee pipe 40 and the inflation pipe 16;

[0039] Step 3: The first pressure monitoring probe 14 continuously monitors the pressure in the sealed airbag 12 , and the second pressure monitoring probe 15 continuously monitors the pressure in the detection space 13 ;

[0040] Step 4: If the pressure in the monitoring detection space 13 continues to decrease and the pressure in the sealing airbag 12 remains unchanged, it means that a gap that penetrates the inside and outside of the detection pipe 1 in the space where the device is located appears;

[0041] Step 5: If the pressure in the monitoring detection space 13 decreases rapidly and the pressure in the sealing airbag 12 remains unchanged, it means that a damage hole that penetrates the inside and outside of the detection pipe 1 in the space where the device is located appears;

[0042] Step 6: If the pressure in the monitoring detection space 13 decreases or increases and then remains stable, and the pressure in the sealing airbag 12 remains unchanged, it indicates that the wall of the detection pipe 1 in the space where the device is located is corroded or has impurities attached;

[0043] The corrosion of the pipe wall will cause the pipe wall thickness to decrease, and the volume of the detection space 13 to increase, so the pressure in the detection space 13 decreases;

[0044] Impurities adhering to the pipe wall will increase the overall thickness of the pipe wall and the adhering impurities, and the volume of the detection space 13 will decrease, so the pressure in the detection space 13 will increase;

[0045] In steps 4, 5, and 6, the pressure in the sealing airbag 12 is maintained constant, which means that after the pipeline safety detection device is moved to a fixed position, the pressure remains unchanged during the continuous pressure monitoring process. During the movement process, the pressure may change due to corrosion or impurities on the wall of the detection pipeline 1, but a certain pressure is maintained during the monitoring process.

[0046] Step 7: When the situations shown in Step 4, Step 5 and Step 6 occur, the safety evaluation index of the detection pipeline 1 is low and needs to be repaired or replaced immediately.

[0047] When the pressure inside the sealing airbag 12 drops rapidly, it means that a sharp object has pierced the sealing airbag 12 on the inner wall of the pipeline. At this time, the pipeline safety detection device cannot detect normally and the sealing airbag 12 needs to be processed first. Since the sealing airbag 12 itself has strong impact resistance and puncture resistance, it is unlikely to be damaged during normal use.

[0048] Furthermore, a first fixed seat 17 is welded and fixed on both sides of the upper and lower ends of the intermediate box body 2, and a rotating adjustment rod 18 is connected to the first fixed seat 17 through an axis rotation, and a movable roller 19 is installed on the other end of the rotating adjustment rod 18, and the upper wheel body of the movable roller 19 is in contact with the inner wall of the detection pipe 1, and a first driving cylinder 22 is installed in the middle of the upper and lower ends of the intermediate box body 2, and the output rod end of the first driving cylinder 22 is connected to the driving adjustment rod 21 through an axis rotation, and the other end of the driving adjustment rod 21 is connected to the second fixed seat 20 through an axis rotation, and the second fixed seat 20 is welded and fixed to the middle of the oblique upper end of the rotating adjustment rod 18.

[0049] The output rod of the first driving cylinder 22 lifts or pulls the connecting shaft position of the two driving adjustment rods 21, driving the driving adjustment rods 21 to rotate inward or outward. The other end of the driving adjustment rod 21 is connected to the rotating adjustment rod 18 through the second fixed seat 20, driving the rotating adjustment rod 18 to rotate inward or outward, driving the moving roller 19 to move synchronously, so that the distance between the outer end points of the two relative moving rollers 19 matches the diameter of the detection pipeline 1.

[0050] The device is placed inside the inspection pipe 1 and moved into the inspection pipe 1 using the movable roller 19. The output rod of the second drive cylinder 30 extends or contracts, driving the first drive rotating rod 24 to rotate. The output rod of the third drive cylinder 33 extends or contracts, driving the second drive rotating rod 25 to rotate. This in turn drives the suction plate 27 to move into contact with the wall of the inspection pipe 1. Under pressure, the suction plate 27 adheres to the wall of the inspection pipe 1. In this state, the safety assessment uses the various detection structures on the pipeline safety detection device to perform safety inspections, alternating between single inspections and movement of the device within the inspection pipe 1.

[0051] Furthermore, a third fixing seat 23 is welded and fixed in the middle of the front and rear ends of the intermediate box body 2, and a first driving rotating rod 24 is connected to the third fixing seat 23 by rotating the shaft. The other end of the first driving rotating rod 24 is connected to the second driving rotating rod 25 by rotating the shaft. A fourth fixing seat 29 is welded and fixed to one side of the front and rear ends of the intermediate box body 2, and a second driving cylinder 30 is connected to the fourth fixing seat 29 by rotating the shaft. The output rod end of the second driving cylinder 30 is connected to the fifth fixing seat 31 by rotating the shaft. The fifth fixing seat 31 is welded and fixed to one side of the first driving rotating rod 24. A sixth fixed seat 32 is welded and fixed to the other side of the front and rear ends of the box body 2, and a third driving cylinder 33 is connected to the sixth fixed seat 32 through an axial rotation. The output rod end of the third driving cylinder 33 is connected to the seventh fixed seat 34 through an axial rotation. The seventh fixed seat 34 is welded and fixed to the other side of the second driving rotating rod 25; a rubber connecting block 26 is fixed to the other end of the second driving rotating rod 25, and the outer end of the rubber connecting block 26 is connected to the adsorption plate 27, and an air intake hose 28 is installed on the inner end of the adsorption plate 27 along one side of the rubber connecting block 26, and the air intake hose 28 is connected to the inside of the adsorption plate 27.

[0052] A second delivery pump 44 is also installed inside the middle box 2. A second air bleed pipe 45 is installed at the input end of the second delivery pump 44. The other end of the second air bleed pipe 45 extends to the interior of the inner airbag 37. A second air delivery pipe 46 is installed at the output end of the second delivery pump 44. The other end of the second air delivery pipe 46 is internally connected to a third connecting tee 47. The other two ends of the third connecting tee 47 are respectively connected to the other ends of the two intake hoses 28.

[0053] When the device is required to advance within the inspection pipe 1, the output rod of the second drive cylinder 30 extends, driving the first drive rotating rod 24 to move. The output rod of the third drive cylinder 33 rotates and slightly contracts the second drive rotating rod 25, pushing the suction plate 27 to continue exerting force toward the inspection pipe 1. While holding the suction plate 27 stationary, the intermediate housing 2 moves forward in the opposite direction, causing the device to move a certain distance within the inspection pipe 1. A second delivery pump 44 then extracts gas from the inner airbag 37 through the second air duct 45 and delivers it to the air intake hose 28 through the second air delivery pipe 46 and the third connecting tee 47. Once the gas enters the suction plate 27, it releases its grip on the wall of the inspection pipe 1. The output rods of the second drive cylinder 30 and the third drive cylinder 33 then move, driving the suction plate 27 away from the wall of the inspection pipe 1. The output rods of the second drive cylinder 30 and the third drive cylinder 33 then cooperate to move the suction plate 27 in its forward direction, until it is in contact with the wall of the inspection pipe 1.

[0054] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A pipeline safety evaluation method within the scope of a power plant boiler, the pipeline safety evaluation method is implemented based on a pipeline safety detection device, the pipeline safety detection device is located in the detection pipeline (1), and is characterized by: The pipeline safety detection device comprises an intermediate box (2), wherein both sides of the intermediate box (2) are provided with connecting pipes (3), the inner ends of the connecting pipes (3) extend into the interior of the intermediate box (2), and the rear ends of the upper ends of both sides of the intermediate box (2) are provided with inflation pipes (16), the inner ends of the inflation pipes (16) extend into the interior of the intermediate box (2), the other end of the connecting pipe (3) on one side is connected to a first sealing assembly (4), and the other end of the connecting pipe (3) on the other side is connected to a second sealing assembly (5), and the structure of the first sealing assembly (4) and the second sealing assembly (5) is as follows: Similarly, the first sealing component (4) and the second sealing component (5) are both composed of an intermediate support member (6) and a sealing airbag (12), the sealing airbag (12) is located in the middle of the outside of the intermediate support member (6), and a detection space (13) is formed between the first sealing component (4) and the second sealing component (5) along the inner side of the detection pipe (1), and a first pressure monitoring probe (14) and a second pressure monitoring probe (15) are installed on the second sealing component (5), the first pressure monitoring probe (14) continuously monitors the pressure in the sealing airbag (12), and the second pressure monitoring probe (15) continuously monitors the pressure in the detection pipe (13). The pressure in the measuring space (13) is measured. An inner air bag (37) is provided on one side of the interior of the intermediate box (2). An inflation tube on the inner air bag (37) passes through the intermediate box (2) and extends to the outside of the intermediate box (2). A first delivery pump (35) is installed on the other side of the interior of the intermediate box (2). The input end of the first delivery pump (35) is connected to a first air bleed pipe (36). The other end of the first air bleed pipe (36) extends to the interior of the inner air bag (37). The output end of the first delivery pump (35) is connected to a first air delivery pipe (38). A first control valve ( 39), a first connecting tee (40) is installed at the other end of the first gas delivery pipe (38), the inner ends of the two inflation pipes (16) are respectively connected to the two ports on the first connecting tee (40), the first gas delivery pipe (38) is fixed along the inner end of the first control valve (39) and is internally connected to a gas delivery branch pipe (41), a second control valve (42) is installed on the gas delivery branch pipe (41), a second connecting tee (43) is installed at the other end of the gas delivery branch pipe (41), and the inner ends of the two communicating pipes (3) are respectively connected to the two ports on the second connecting tee (43);A third fixing seat (23) is welded and fixed in the middle of the front and rear ends of the intermediate box (2), a first driving rotating rod (24) is connected to the third fixing seat (23) through a shaft, the other end of the first driving rotating rod (24) is connected to the second driving rotating rod (25) through a shaft, the other end of the second driving rotating rod (25) is fixed to a rubber connecting block (26), the outer end of the rubber connecting block (26) is connected to an adsorption disk (27), the inner end of the adsorption disk (27) is installed with an intake hose (28) along one side of the rubber connecting block (26), and the intake hose (28) is communicated with the interior of the adsorption disk (27), a second delivery pump (44) is further installed inside the intermediate box (2), a second air bleed pipe (45) is installed at the input end of the second delivery pump (44), the other end of the second air bleed pipe (45) extends to the interior of the inner airbag (37), a second air delivery pipe (46) is installed at the output end of the second delivery pump (44), the other end of the second air delivery pipe (46) is internally communicated with a third connecting three-way pipe (47), and the other two ends of the third connecting three-way pipe (47) are respectively connected to the other ends of the two air intake hoses (28); The pipeline safety assessment method comprises the following steps: Step 1: The first control valve (39) is closed, the second control valve (42) is opened, the first delivery pump (35) extracts the gas in the inner airbag (37) through the first air duct (36), and delivers the gas to the sealed airbag (12) through the first air delivery pipe (38), the air delivery branch pipe (41), the second connecting three-way pipe (43) and the connecting pipe (3), until the sealed airbag (12) is completely inflated and the detection space (13) is sealed; Step 2: The first control valve (39) is opened, the second control valve (42) is closed, and the first delivery pump (35) extracts gas from the inner air bag (37) through the first air duct (36) and delivers the gas to the detection space (13) through the first air delivery pipe (38), the first connecting three-way pipe (40) and the inflation pipe (16); Step 3: The first pressure monitoring probe (14) continuously monitors the pressure in the sealed airbag (12), and the second pressure monitoring probe (15) continuously monitors the pressure in the detection space (13); Step 4: When the pressure in the monitoring detection space (13) continues to decrease and the pressure in the sealing airbag (12) remains unchanged, it indicates that a gap that penetrates the inside and outside of the detection pipe (1) in the space where the device is located appears; Step 5: When the pressure in the monitoring detection space (13) decreases rapidly and the pressure in the sealing airbag (12) remains unchanged, it indicates that a damage hole that penetrates the inside and outside of the detection pipe (1) in the space where the device is located appears; Step 6: If the pressure in the monitoring detection space (13) decreases or increases and then remains stable, and the pressure in the sealed airbag (12) remains unchanged, it indicates that the wall of the detection pipe (1) in the space where the device is located is corroded or has impurities attached to it; Step 7: When the situations shown in Step 4, Step 5 and Step 6 occur, the safety evaluation index of the detection pipeline (1) is low.

2. The pipeline safety assessment method within the scope of a power plant boiler according to claim 1 is characterized by: The intermediate support member (6) includes an outer fixing plate (7) and an inner fixing column (8), the outer fixing plate (7) is integrally connected to both sides of the inner fixing column (8), the connection position between the outer fixing plate (7) and the inner fixing column (8) is set to be arc-shaped, and an annular groove (9) is formed between the two outer fixing plates (7) along the outside of the inner fixing column (8), and the sealing airbag (12) is located in the annular groove (9).

3. The method for safety assessment of pipelines within the scope of a power plant boiler according to claim 2, characterized in that: A first slot (10) is provided in the middle of the outer fixing plate (7) on the inner side of each group, a second slot (11) is provided on the inner fixing column (8), a channel connecting the first slot (10) and the second slot (11) is provided in the middle supporting member (6), the first slot (10) is connected to the inside of the connecting pipe (3), the inflation port of the sealing airbag (12) is fixed in the second slot (11), and the sealing airbag (12) is connected to the inside of the second slot (11).

4. The pipeline safety assessment method within the scope of a power plant boiler according to claim 1 is characterized by: A fourth fixing seat (29) is welded and fixed to one side of the front and rear ends of the intermediate box (2), a second driving cylinder (30) is connected to the fourth fixing seat (29) by means of a shaft rotation, an output rod end of the second driving cylinder (30) is connected to a fifth fixing seat (31) by means of a shaft rotation, the fifth fixing seat (31) is welded and fixed to one side of the first driving rotating rod (24), a sixth fixing seat (32) is welded and fixed to the other side of the front and rear ends of the intermediate box (2), a third driving cylinder (33) is connected to the sixth fixing seat (32) by means of a shaft rotation, an output rod end of the third driving cylinder (33) is connected to a seventh fixing seat (34) by means of a shaft rotation, the seventh fixing seat (34) is welded and fixed to the other side of the second driving rotating rod (25).

5. The pipeline safety assessment method within the scope of a power plant boiler according to claim 1 is characterized by: A first fixing seat (17) is welded and fixed to both sides of the upper and lower ends of the intermediate box (2); a rotating adjustment rod (18) is rotatably connected to the first fixing seat (17) via an axis; a moving roller (19) is installed at the other end of the rotating adjustment rod (18); and an upper wheel body of the moving roller (19) is in contact with the inner wall of the detection pipe (1).

6. The method for safety assessment of pipelines within the scope of a power plant boiler according to claim 5, characterized in that: A first driving cylinder (22) is installed in the middle of the upper and lower ends of the intermediate box (2), and the output rod end of the first driving cylinder (22) is connected to the driving adjustment rod (21) through a shaft rotation, and the other end of the driving adjustment rod (21) is connected to the second fixing seat (20) through a shaft rotation, and the second fixing seat (20) is welded and fixed to the middle of the oblique upper end of the rotating adjustment rod (18).

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