A power plant boiler circulating water pipeline leakage detection device and method

Abstract

The application discloses a power plant boiler circulating water pipeline leakage detection device and method, which comprises a main pipeline and two valve bodies; the two valve bodies are arranged on the inlet side pipeline and the outlet side pipeline of the main pipeline respectively, a lifting mechanism is arranged above the valve body, the lifting direction of the lifting mechanism is a vertical direction, a positioning mechanism is arranged at the bottom end of the lifting mechanism, and the positioning mechanism comprises a sound wave sensor; when leakage detection is performed, the sound wave sensor is in contact with the valve body pipeline wall. When the circulating water pipeline leaks, the leakage point can be quickly located.

Description

Technical Field

[0001] The present invention belongs to the field of pipeline leakage detection, and relates to a device and method for detecting leakage of a circulating water pipeline of a boiler in a power plant. Background Art

[0002] When power plant boilers are in use, circulating cooling water is connected to an external cooling tower via a circulating water pipe. In large thermal power generating units, to ensure the flow of circulating water, the size of the circulating water pipes is constantly increasing. These pipes are buried deep underground. While defects in circulating water pipes are relatively rare, they are difficult to address once they do occur. Power plants typically install leak detection devices on circulating water pipes, but common liquid leak detection devices on the market have poor detection performance and cannot quickly locate leaks. Summary of the Invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a power plant boiler circulating water pipeline leakage detection device and method, which can quickly locate the leakage point when a leakage occurs in the circulating water pipeline.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A leakage detection device for a circulating water pipeline of a power plant boiler includes a main pipeline and two valve bodies;

[0006] The two valve bodies are respectively arranged on the inlet side pipeline and the outlet side pipeline of the main pipeline. A lifting mechanism is arranged above the valve body, and the lifting direction of the lifting mechanism is vertical. A positioning mechanism is arranged at the bottom end of the lifting mechanism, and the positioning mechanism includes an acoustic wave sensor; when leak detection is performed, the acoustic wave sensor contacts the valve body pipe wall.

[0007] Preferably, a main inspection mechanism is provided on the inlet side pipeline of the main pipeline, and the main inspection mechanism includes a first connecting pipe, a pressure sensor and a first instrument. The first connecting pipe is fixedly installed at the top of the inlet side pipeline of the main pipeline, the pressure sensor is provided inside the first connecting pipe, and the first instrument is provided at the top of the first connecting pipe. The first instrument is electrically connected to the pressure sensor.

[0008] Furthermore, a secondary inspection mechanism is provided on the outlet side pipeline of the main pipeline, and the secondary inspection mechanism includes a second connecting pipe, a flow sensor and a second instrument. The second connecting pipe is fixedly installed on the top of the outlet side pipeline of the main pipeline, and the flow sensor is provided inside the second connecting pipe. The second instrument is fixedly installed on the top of the second connecting pipe, and the second instrument is electrically connected to the flow sensor.

[0009] Preferably, the lifting mechanism comprises a bracket, a shock pad and an electric cylinder, the two ends of the valve body are fixedly provided with pipe sleeves, the top ends of the pipe sleeves are fixedly provided with the bracket, the top end of the bracket is fixedly provided with the shock pad, the top end of the shock pad is fixedly provided with the electric cylinder, the output end of the electric cylinder is fixedly connected with a push rod penetrating through the shock pad and the bracket, and the push rod is connected with the positioning mechanism.

[0010] Preferably, the positioning mechanism comprises a cylinder, a sealing ring and a pressure plate, the top of the cylinder is connected with the output end of the lifting mechanism, the inside bottom end of the cylinder is fixedly provided with the acoustic sensor, the acoustic sensor and the bottom end outside the cylinder are provided with the sealing ring, and the bottom end of the acoustic sensor is fixedly connected with the pressure plate penetrating through the sealing ring.

[0011] Preferably, the positioning mechanism is provided with a signal transmitter and a signal receiver, and the signal transmitter and the signal receiver are connected with the acoustic sensor.

[0012] Further, the main pipeline is externally provided with a digital display, and the digital display is electrically connected with the signal transmitter.

[0013] Preferably, the two valve bodies are respectively provided with water inlet pipes and water outlet pipes on the sides away from the main pipeline.

[0014] A power plant boiler circulating water pipeline leakage detection method based on the device described in any one of the above, comprising the following processes:

[0015] When the circulating water pipeline leaks, the lifting mechanism above the two valve bodies is started to drive the positioning mechanism to descend, the acoustic sensor contacts the valve wall, the noise of the leakage point is received through the acoustic sensor, the time difference of the noise reaching the two acoustic sensors is determined, and the position of the leakage point is calculated through the time difference.

[0016] Preferably, when the position of the leakage point is detected, the digital display is displayed, and the positive and negative values and the numbers are used for positioning when the digital display is displayed, the positive and negative values represent the direction, and the numbers represent the distance.

[0017] Compared with the prior art, the present application has the following beneficial effects:

[0018] The present application can receive the noise of the leakage point through the acoustic sensor when positioning, then determine the time difference of the noise reaching the two acoustic sensors, and calculate the position of the leakage point through the time difference.

[0019] Further, when the conveying pipeline is damaged and leaks, the local pressure of the pipeline is reduced when the leakage flow is large, and the pressure in the second communication pipe can be monitored in real time through the cooperation between the pressure sensor and the first instrument, so that the leakage can be detected through the pressure.

[0020] Furthermore, by providing a secondary inspection mechanism, leakage monitoring can be performed on both the inlet and outlet pipelines of the main pipeline.

[0021] Furthermore, when the location of the leak is detected, it can be displayed on a digital display. The digital display uses positive and negative values ​​and numbers for positioning. Positive and negative values ​​represent left and right directions, and numbers represent distances, making it easier for staff to make judgments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall front view structure of the present invention;

[0023] Figure 2 It is a schematic structural diagram of the lifting mechanism of the present invention;

[0024] Figure 3 For the present invention Figure 2 An enlarged schematic diagram of point A in FIG.

[0025] Figure 4 For the present invention Figure 2 An enlarged schematic diagram of point B in FIG.

[0026] Among them: 1. Main pipeline; 2. First connecting pipe; 3. Second connecting pipe; 4. Main inspection mechanism; 5. Secondary inspection mechanism; 6. Valve body; 7. Lifting mechanism; 8. Positioning mechanism; 9. First connecting pipe; 10. Pressure sensor; 11. First instrument; 12. Second connecting pipe; 13. Flow sensor; 14. Second instrument; 15. Bracket; 16. Shock absorber; 17. Electric cylinder; 18. Pipe sleeve; 19. Push rod; 20. Acoustic sensor; 21. Sealing ring; 22. Pressure plate; 23. Cylinder; 24. Water outlet pipe; 25. Signal transmitter; 26. Signal receiver; 27. Bracket; 28. Digital display; 29. ​​Water inlet pipe. DETAILED DESCRIPTION

[0027] 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; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0028] It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to directions in the accompanying drawings, and the words "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used herein in the specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0030] like Figure 1 1 is a diagram showing a leakage detection device for a circulating water pipeline of a power plant boiler according to the present invention, comprising a main pipeline 1, two valve bodies 6, a main detection mechanism 4 and a secondary detection mechanism 5.

[0031] The two ends of the main pipeline 1 are connected to the first connecting pipe 2 and the second connecting pipe 3 respectively through the conveying pipe. The top of the second connecting pipe 3 is provided with a main detection mechanism 4, and the top of the first connecting pipe 2 is provided with a secondary detection mechanism 5.

[0032] The two valve bodies 6 are respectively arranged at one end of the first connecting pipe 2 and the second connecting pipe 3 away from the main pipeline 1. Figure 2 As shown, a lifting mechanism 7 is provided at the top end of the valve body 6 , the lifting direction of the lifting mechanism 7 is vertical, and a positioning mechanism 8 is provided at the bottom end of the lifting mechanism 7 .

[0033] In the present invention, the main detection mechanism 4 includes a first connecting pipe 9, a pressure sensor 10 and a first instrument 11. The first connecting pipe 9 is fixedly installed at the top of the second connecting pipe 3. The pressure sensor 10 is set inside the first connecting pipe 9. The first instrument 11 is set at the top of the first connecting pipe 9. The first instrument 11 is electrically connected to the pressure sensor 10. By setting up the main detection mechanism 4, the detection principle of the main detection mechanism 4 is that if the conveying pipeline is damaged and leaking, when the leakage flow is large, the local pressure in the pipeline will decrease. At this time, the pressure inside the second connecting pipe 3 can be monitored in real time through the cooperation between the pressure sensor 10 and the first instrument 11, so that leakage detection can be performed through pressure.

[0034] In the present invention, the auxiliary detection mechanism 5 includes a second connecting pipe 12, a flow sensor 13 and a second meter 14. The second connecting pipe 12 is fixedly installed at the top of the first connecting pipe 2, and the flow sensor 13 is arranged inside the second connecting pipe 12. The second meter 14 is fixedly installed at the top of the second connecting pipe 12, and the second meter 14 is electrically connected to the flow sensor 13. By setting up the auxiliary detection mechanism 5, the detection principle of the auxiliary detection mechanism 5 is that if the conveying pipeline is damaged and leaking, the water flow inside will change. At this time, the water flow inside the first connecting pipe 2 can be monitored in real time through the cooperation between the flow sensor 13 and the second meter 14, so that detection can be performed through the flow rate;

[0035] like Figure 3As shown, the lifting mechanism 7 in the application includes a bracket 15, a shock pad 16 and an electric cylinder 17, both ends of the valve body 6 are fixedly installed with a sleeve 18, the top ends of the two sleeves 18 are fixedly installed with the bracket 15, the top end of the bracket 15 is fixedly installed with the shock pad 16, the top end of the shock pad 16 is fixedly installed with the electric cylinder 17, the output end of the electric cylinder 17 is fixedly connected with a push rod 19 through the shock pad 16 and the bracket 15, by setting the lifting mechanism 7, when the main inspection mechanism 4 and the auxiliary inspection mechanism 5 monitor that the pipeline leaks, the electric cylinder 17 at the top end of the two valve bodies 6 is controlled to start, and the output shaft of the two electric cylinders 17 is controlled to lower the cylinder body 23 after the two electric cylinders 17 are started at the same time, the cylinder body 23 drives the sealing ring 21 at the bottom end of the sound wave sensor 20 to abut against the pipeline after being lowered, so that the purpose of being convenient to lift is achieved.

[0036] As shown, Figure 4 The positioning mechanism 8 in the application includes a sound wave sensor 20, a sealing ring 21 and a pressure plate 22, the bottom end of the push rod 19 is fixedly installed with a cylinder body 23, the inside bottom end of the cylinder body 23 is fixedly installed with the sound wave sensor 20, the sound wave sensor 20 and the bottom end outside of the cylinder body 23 are provided with the sealing ring 21, and the bottom end of the sound wave sensor 20 is fixedly connected with the pressure plate 22 through the sealing ring 21, by setting the positioning mechanism 8, when positioning, the sound wave sensor 20 can receive the noise of the leakage point, then the time difference of the noise reaching the two sound wave sensors 20 is determined, the position of the leakage point is calculated through the time difference, after the position of the leakage point is detected, the digital display 28 can be displayed, and the digital display 28 is positioned through the positive and negative values and the numbers, the positive and negative values represent the left and right directions, and the numbers represent the distance.

[0037] The inside top end of the cylinder body 23 in the application is fixedly installed with a signal transmitter 25, and the side, away from the signal transmitter 25, of the cylinder body 23 is fixedly installed with a signal receiver 26.

[0038] The top end of the main pipeline 1 in the application is fixedly installed with a support 27, and the top end of the support 27 is fixedly installed with a digital display 28.

[0039] The side, away from the main pipeline 1, of the two valve bodies 6 in the application is respectively installed with a water inlet pipe 29 and a water outlet pipe 24.

[0040] The signal transmitter 25 and the digital display 28 are electrically connected in the application.

[0041] A power plant boiler circulating water pipeline leakage detection device and method

[0042] Firstly, the water inlet pipe 29 is connected with the cooling tower, and then the water outlet pipe 24 is connected with the condenser, so that the water in the cooling tower can be circulated and transported between the pump and the condenser after installation.

[0043] Step 2: After the cooling water enters from the water inlet pipe 29, it will pass through the valve body 6 on the side of the second connecting pipe 3 in sequence, then enter the second connecting pipe 3, then pass through the main pipeline 1 into the first connecting pipe 2, and finally enter the water outlet pipe 24 from the second connecting pipe 3 on the side of the first connecting pipe 2 for transportation. When a leak occurs in the transportation pipeline between the water inlet pipe 29 and the water outlet pipe 24, it will be detected by the main inspection mechanism 4 and the auxiliary inspection mechanism 5.

[0044] Step 3: The detection principle of the main inspection mechanism 4 is that if the conveying pipeline is damaged and leaking, when the leakage rate is large, the local pressure of the pipeline will decrease. At this time, the pressure inside the second connecting pipe 3 can be monitored in real time through the cooperation between the pressure sensor 10 and the first instrument 11. The detection principle of the secondary inspection mechanism 5 is that if the conveying pipeline is damaged and leaking, the internal water flow will change. At this time, the water flow inside the first connecting pipe 2 can be monitored in real time through the cooperation between the flow sensor 13 and the second instrument 14.

[0045] Step 4: When the main inspection mechanism 4 and the auxiliary inspection mechanism 5 detect a leak in the pipeline, they will control the electric cylinders 17 at the top of the two valve bodies 6 to start. After the two electric cylinders 17 are started at the same time, their output shafts will control the cylinder 23 to descend. After the cylinder 23 descends, it drives the sealing ring 21 at the bottom of the acoustic wave sensor 20 to press against the pipeline. In this way, the noise of the leak point can be received by the acoustic wave sensor 20, and then the time difference between the noise reaching the two acoustic wave sensors 20 is determined, and the position of the leak point is calculated based on the time difference.

[0046] Step 5: After the location of the leak is detected, it can be displayed on the digital display 28. The digital display 28 uses positive and negative values ​​and numbers for positioning. The positive and negative values ​​represent the left and right directions, and the numbers represent the distance.

[0047] Working principle: First, connect the water inlet pipe 29 to the cooling tower, and then connect the water outlet pipe 24 to the condenser. After installation, the water in the cooling tower can be circulated between the pump and the condenser. When the cooling water enters from the water inlet pipe 29, it will pass through the valve body 6 on one side of the second connecting pipe 3 in turn, then enter the second connecting pipe 3, then pass through the main pipeline 1 to enter the first connecting pipe 2, and finally enter the water outlet pipe 24 from the second connecting pipe 3 on the side of the first connecting pipe 2 for transportation. When a leak occurs in the transportation pipeline between the water inlet pipe 29 and the water outlet pipe 24, it will be detected by the main inspection mechanism 4 and The auxiliary inspection mechanism 5 performs detection. When the main inspection mechanism 4 and the auxiliary inspection mechanism 5 detect that a leak occurs in the pipeline, the electric cylinders 17 at the top of the two valve bodies 6 will be controlled to start. After the two electric cylinders 17 are started at the same time, their output shafts will control the cylinder 23 to descend. After the cylinder 23 descends, it drives the sealing ring 21 at the bottom of the acoustic wave sensor 20 to press against the pipeline. In this way, the noise of the leakage point can be received by the acoustic wave sensor 20, and then the time difference between the noise reaching the two acoustic wave sensors 20 is determined. The position of the leakage point is calculated by the time difference. When the position of the leakage point is detected, it can be displayed by the digital display 28.

[0048] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0049] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of this patent should not be determined with reference to the above description, but rather with reference to the preceding claims and the full scope of equivalents to which such claims are entitled. For the purpose of completeness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein from the preceding claims is not a disclaimer of such subject matter, nor should it be considered that the applicants did not consider such subject matter to be part of the disclosed inventive subject matter.

Claims

1. A leakage detection device for a circulating water pipeline of a power plant boiler, characterized in that: It includes a main pipeline (1) and two valve bodies (6); Two valve bodies (6) are respectively arranged on the inlet side pipeline and the outlet side pipeline of the main pipeline (1); a lifting mechanism (7) is arranged above the valve body (6); the lifting direction of the lifting mechanism (7) is vertical; a positioning mechanism (8) is arranged at the bottom end of the lifting mechanism (7); the positioning mechanism (8) includes an acoustic wave sensor (20); when leak detection is performed, the acoustic wave sensor (20) contacts the pipe wall of the valve body (6); A main inspection mechanism (4) is provided on the inlet side pipeline of the main pipeline (1), and the main inspection mechanism (4) includes a first connecting pipe (9), a pressure sensor (10) and a first instrument (11). The first connecting pipe (9) is fixedly installed at the top end of the inlet side pipeline of the main pipeline (1), the pressure sensor (10) is provided inside the first connecting pipe (9), and the first instrument (11) is provided at the top end of the first connecting pipe (9). The first instrument (11) is electrically connected to the pressure sensor (10). The lifting mechanism (7) includes a bracket (15), a shock-absorbing pad (16) and an electric cylinder (17), both ends of the valve body (6) are fixedly mounted with a pipe sleeve (18), the top of the pipe sleeve (18) is fixedly mounted with the bracket (15), the top of the bracket (15) is fixedly mounted with the shock-absorbing pad (16), the top of the shock-absorbing pad (16) is fixedly mounted with the electric cylinder (17), the output end of the electric cylinder (17) passes through the shock-absorbing pad (16) and the bracket (15) and is fixedly connected with a push rod (19), and the push rod (19) is connected to the positioning mechanism (8); The positioning mechanism (8) includes a cylinder (23), a sealing ring (21) and a pressure plate (22); the top of the cylinder (23) is connected to the output end of the lifting mechanism (7); the inner bottom end of the cylinder (23) is fixedly mounted with an acoustic wave sensor (20); a sealing ring (21) is provided between the acoustic wave sensor (20) and the outer bottom end of the cylinder (23); the bottom end of the acoustic wave sensor (20) passes through the sealing ring (21) and is fixedly connected to the pressure plate (22); A secondary inspection mechanism (5) is provided on the outlet side pipeline of the main pipeline (1), and the secondary inspection mechanism (5) includes a second connecting pipe (12), a flow sensor (13) and a second meter (14). The second connecting pipe (12) is fixedly installed at the top end of the outlet side pipeline of the main pipeline (1), the flow sensor (13) is provided inside the second connecting pipe (12), and the second meter (14) is fixedly installed at the top end of the second connecting pipe (12). The second meter (14) is electrically connected to the flow sensor (13). A signal transmitter (25) and a signal receiver (26) are provided on the positioning mechanism (8), and the signal transmitter (25) and the signal receiver (26) are connected to the acoustic wave sensor (20).

2. The power plant boiler circulating water pipeline leakage detection device according to claim 1, characterized in that: A digital display (28) is provided outside the main pipe (1), and the digital display (28) is electrically connected to the signal transmitter (25).

3. The power plant boiler circulating water pipeline leakage detection device according to claim 1, characterized in that: A water inlet pipe (29) and a water outlet pipe (24) are respectively installed on one side of the two valve bodies (6) away from the main pipeline (1).

4. A method for detecting leakage in a circulating water pipeline of a power plant boiler based on the device according to any one of claims 1 to 3, characterized in that: The following processes are included: When a leak occurs in the circulating water pipeline, the lifting mechanism (7) above the two valve bodies (6) is activated, driving the positioning mechanism (8) to descend, and the acoustic wave sensor (20) contacts the pipe wall of the valve body (6). The acoustic wave sensor (20) receives the noise of the leak point, determines the time difference between the noise reaching the two acoustic wave sensors (20), and calculates the position of the leak point based on the time difference.

5. The method for detecting leakage of a circulating water pipeline of a power plant boiler according to claim 4, characterized in that: When the position of the leak is detected, it is displayed by a digital display (28). The digital display (28) is positioned by positive and negative values ​​and numbers when it is displayed. The positive and negative values ​​represent the direction, and the numbers represent the distance.

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