A condenser heat exchange tube inflation automatic leak detection device and leak detection method

Abstract

The present invention discloses an automatic leak detection device and method for inflating condenser heat exchange tubes. The system includes an automatic water discharge system, a mobile leaking pipe row sealing system, and an inflation leak detection system. The output end of the air compressor is connected to the sealing rod of the water inlet heat exchange tube row for inflating the condenser heat exchange tube row after the sealing rod of the water inlet heat exchange tube row and the sealing rod of the water outlet heat exchange tube row are sealed and isolated. The inflation leak detection control device is electrically connected to a joint-type pressure transmitter. When a leak occurs in the condenser and the leaking water chamber is determined, the present invention can automatically and accurately locate the leaking heat exchange tube in a certain row of the condenser by inflating the condenser heat exchange tube row and detecting the pressure drop rate, greatly reducing the workload of maintenance personnel and saving leak detection time.

Description

Technical Field

[0001] The invention relates to the technical field of condenser leakage detection, in particular to a condenser heat exchange tube air-inflating automatic leakage detection device and a leakage detection method. Background Art

[0002] Condensers are crucial cooling equipment in power plants. Cooling water with a high salt content flows through the condenser's heat exchange tubes, while pure steam, nearly free of impurities, flows outside the tubes. If a condenser tube leaks during operation, the high-salt cooling water leaks into the pure condensate, rapidly contaminating it and causing a sharp deterioration in the steam quality of the entire unit, especially in seawater-cooled power plants. Therefore, condensers are equipped with leak detection devices during the capital construction phase. However, existing leak detection devices can only diagnose which water chamber is leaking, and each water chamber contains approximately 10,000 heat exchange tubes. This requires operating half of the condenser, draining the cooling water from the leaking condenser water chamber, and inspectors entering the condenser water chamber to perform leak detection using methods such as film coverage, foam testing, candle flame testing, helium mass spectrometry, and eddy current testing to determine which tubes are leaking. This is labor-intensive, time-consuming, and demanding. Furthermore, during in-service leak detection, the condenser is subjected to harsh, high-temperature, and high-humidity confined environments, posing significant safety risks to inspectors. Summary of the Invention

[0003] In order to overcome the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a condenser heat exchange tube inflation automatic leak detection device and leak detection method, which can automatically inflate the condenser heat exchange tube for leak detection, greatly reducing the leak detection scope.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0005] A condenser heat exchange tube inflation automatic leak detection device, comprising a movable heat exchange tube bank sealing system and an inflation leak detection system;

[0006] The movable heat exchange tube row sealing system includes a water inlet guide rail lifting frame and a water inlet lifting frame lifting motor installed inside the cooling water inlet water chamber, and a water inlet heat exchange tube row sealing rod and a water inlet sealing rod vertical sealing motor installed on the water inlet guide rail lifting frame;

[0007] It also includes a water outlet guide rail lifting frame installed inside the cooling water outlet water chamber and a water outlet lifting frame lifting motor, as well as a water outlet heat exchange pipe row sealing rod installed on the water outlet guide rail lifting frame and a water outlet sealing rod vertical sealing motor;

[0008] The inflation leak detection system includes a joint-type pressure transmitter installed inside the sealing rod of the water inlet heat exchange tube row, an air compressor, and an inflation leak detection control device;

[0009] The output end of the air compressor is connected to the water inlet heat exchange tube row sealing rod for inflating the condenser heat exchange tube row after the water inlet heat exchange tube row sealing rod and the water outlet heat exchange tube row sealing rod are sealed and isolated. The inflation leak detection control device is electrically connected to the joint type pressure transmitter.

[0010] As a further improvement of the present invention, it also includes an automatic water release system;

[0011] The automatic water discharge system comprises an air electric door and a water discharge electric door installed outside the cooling water inlet water chamber; the air electric door and the water discharge electric door are both electrically connected to the inflation leak detection control device.

[0012] As a further improvement of the present invention, the water inlet lifting frame lifting motor and the water inlet sealing rod vertical sealing motor are both electrically connected to the inflation leak detection control device.

[0013] As a further improvement of the present invention, the water outlet lifting frame lifting motor and the water outlet sealing rod vertical sealing motor are both electrically connected to the inflation leak detection control device.

[0014] As a further improvement of the present invention, the water inlet lifting frame lifting motor and the water outlet lifting frame lifting motor in the mobile heat exchange tube row sealing system respectively control the water inlet heat exchange tube row sealing rod and the water outlet heat exchange tube row sealing rod to perform lifting movements on the water inlet guide rail lifting frame and the water outlet guide rail lifting frame.

[0015] As a further improvement of the present invention, the water inlet sealing rod vertical sealing motor and the water outlet sealing rod vertical sealing motor respectively control the water inlet heat exchange tube row sealing rod and the water outlet heat exchange tube row sealing rod to move perpendicular to the condenser heat exchange tube plate; when the water inlet heat exchange tube row sealing rod and the water outlet heat exchange tube row sealing rod are simultaneously vertically pressed against the heat exchange tube row of the condenser, the heat exchange tube row is sealed and isolated.

[0016] As a further improvement of the present invention, the joint-type pressure transmitter is used to detect the pressure of the condenser heat exchange tube row after being sealed and isolated by the inlet heat exchange tube row sealing rod and the outlet heat exchange tube row sealing rod.

[0017] A leak detection method for the condenser heat exchange tube automatic leak detection device with air filling comprises:

[0018] When a leak occurs in the condenser and the leaking water chamber is identified, after the circulating water in the condenser water chamber is discharged, the water inlet lifting frame lifting motor and the water outlet lifting frame lifting motor are synchronously operated to adjust the sealing rods of the water inlet heat exchange tube row and the water outlet heat exchange tube row to the same heat exchange tube row height; the water inlet sealing rod vertical sealing motor and the water outlet sealing rod vertical sealing motor are synchronously operated to control the water inlet heat exchange tube row sealing rod and the water outlet heat exchange tube row sealing rod to be vertically close to the condenser inlet and outlet chamber tube sheets;

[0019] The inflation leak detection control device controls the air compressor to automatically inflate the space formed by the water inlet heat exchange tube row sealing rod, the water outlet heat exchange tube row sealing rod and the condenser tube row. The inflation pressure is detected by the joint-type pressure transmitter, and the leakage condition of the condenser heat exchange tube row is judged by detecting the pressure drop rate.

[0020] As a further improvement of the present invention, the air compressor is stopped when the pressure reaches 0.3-0.7 MPa, and the air inflation leak detection control device detects the pressure drop rate. When the pressure drop rate is ≥0.1 MPa / h, it is considered that there is a leak in the condenser heat exchange tube row.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] The condenser heat exchange tube inflation automatic leak detection device of the present invention includes an automatic water discharge system, a mobile leaking pipe row sealing system, and an inflation leak detection system. When a leak occurs in the condenser and the leaking water chamber is determined, the present invention can automatically and accurately locate the leaking heat exchange tube of the condenser to a certain row by inflating the condenser heat exchange tube row and detecting the pressure reduction rate, greatly reducing the workload of maintenance personnel and saving leak detection time. Compared with conventional condenser leak detection devices, which can only locate the leaking pipe position in a certain water chamber, this method can locate the leaking pipe to several pipes in a certain water chamber, greatly reducing the workload. Compared with the method of manually entering the condenser water chamber to check for leaks after shutdown, the height position of the leaking pipe can be known without the need for detection personnel to enter the water chamber, which greatly saves the time of locating the leaking pipe. Compared with helium mass spectrometry leak detection, eddy current detection and other methods, the device is simple and easy to operate and implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only schematic and are used to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. In the drawings:

[0024] Figure 1 The present invention is a schematic diagram of a cooling water inlet chamber of a condenser heat exchange tube inflation automatic leak detection device.

[0025] Figure 2 The present invention is a schematic diagram of a cooling water outlet chamber of a condenser heat exchange tube inflation automatic leak detection device. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0027] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be an element centered thereon. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an element centered thereon. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0028] 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.

[0029] Example 1

[0030] like Figure 1 and Figure 2 As shown, a condenser heat exchange tube inflation automatic leak detection device includes a movable heat exchange tube bank sealing system and an inflation leak detection system;

[0031] The movable heat exchange tube row sealing system includes a water inlet guide rail lifting frame 2 and a water inlet lifting frame lifting motor 7 installed inside the cooling water inlet water chamber 1, and a water inlet heat exchange tube row sealing rod 4 and a water inlet sealing rod vertical sealing motor 6 installed on the water inlet guide rail lifting frame 2;

[0032] The cooling water outlet chamber 11 further includes a water outlet guide rail lifting frame 12 and a water outlet lifting frame lifting motor 15, as well as a water outlet heat exchange pipe row sealing rod 13 and a water outlet sealing rod vertical sealing motor 14 installed on the water outlet guide rail lifting frame 12.

[0033] The inflation leak detection system includes a joint-type pressure transmitter 5 installed inside the sealing rod 4 of the water inlet heat exchange pipe row, an air compressor 9, and an inflation leak detection control device 10;

[0034] The inlet lift frame lift motor 7 drives the inlet heat exchange pipe row sealing rod 4 to move up and down on the inlet guide rail lift frame 2. The inlet sealing rod vertical sealing motor 6 drives the inlet heat exchange pipe row sealing rod 4 to move vertically. The outlet lift frame lift motor 15 drives the outlet heat exchange pipe row sealing rod 13 to move up and down on the outlet guide rail lift frame 12. The outlet sealing rod vertical sealing motor 14 drives the outlet heat exchange pipe row sealing rod 13 to move vertically.

[0035] The output end of the air compressor 9 is connected to the water inlet heat exchange tube row sealing rod 4 for inflating the condenser heat exchange tube row after the water inlet heat exchange tube row sealing rod 4 and the water outlet heat exchange tube row sealing rod 13 are sealed and isolated. The inflation leak detection control device 10 is electrically connected to the joint type pressure transmitter 5.

[0036] The inflation leak detection control device 10 controls the air compressor 9 to automatically inflate the space formed by the water inlet heat exchange tube row sealing rod 4, the water outlet heat exchange tube row sealing rod 13 and the condenser tube row, and detects the inflation pressure through the joint-type pressure transmitter 5. The leakage condition of the condenser heat exchange tube row is judged by detecting the pressure drop rate.

[0037] The present invention can automatically and accurately locate the leaking heat exchange tubes of the condenser to a certain row by inflating the condenser heat exchange tube rows and detecting the pressure reduction rate, greatly reducing the workload of maintenance personnel and saving leak detection time.

[0038] Example 2

[0039] like Figure 1 and Figure 2 As shown, the present invention provides a condenser heat exchange tube inflation automatic leak detection device, including an automatic water discharge system, a movable heat exchange tube bank sealing system and an inflation leak detection system;

[0040] The automatic water discharge system includes an air electric door 3 and a water discharge electric door 8 installed outside the cooling water inlet chamber 1;

[0041] The mobile heat exchange tube row sealing system includes a water inlet guide rail lifting frame 2 and a water inlet lifting frame lifting motor 7 installed inside the cooling water inlet water chamber 1, as well as a water inlet heat exchange tube row sealing rod 4 and a water inlet sealing rod vertical sealing motor 6 installed on the water inlet guide rail lifting frame 2; it also includes a water outlet guide rail lifting frame 12 and a water outlet lifting frame lifting motor 15 installed inside the cooling water outlet water chamber 11, as well as a water outlet heat exchange tube row sealing rod 13 and a water outlet sealing rod vertical sealing motor 14 installed on the water outlet guide rail lifting frame 12;

[0042] The inflation leak detection system includes a joint-type pressure transmitter 5 installed inside the sealing rod 4 of the heat exchange tube bank, an air compressor 9, an inflation leak detection control device 10 and corresponding pipelines.

[0043] The output end of the air compressor 9 is connected to the water inlet heat exchange tube row sealing rod 4 for inflating the condenser heat exchange tube row after the water inlet heat exchange tube row sealing rod 4 and the water outlet heat exchange tube row sealing rod 13 are sealed and isolated. The inflation leak detection control device 10 is electrically connected to the joint type pressure transmitter 5.

[0044] The water inlet lifting frame lifting motor 7 and the water inlet sealing rod vertical sealing motor 6 are both electrically connected to the inflation leak detection control device 10. The water outlet lifting frame lifting motor 15 and the water outlet sealing rod vertical sealing motor 14 are both electrically connected to the inflation leak detection control device 10.

[0045] In the mobile heat exchange tube row sealing system, the water inlet lifting frame lifting motor 7 and the water outlet lifting frame lifting motor 15 respectively control the water inlet heat exchange tube row sealing rod 4 and the water outlet heat exchange tube row sealing rod 13 to perform lifting movements on the water inlet guide rail lifting frame 2 and the water outlet guide rail lifting frame 12. The water inlet heat exchange tube row sealing rod 4 and the water outlet heat exchange tube row sealing rod 13 can respectively stay at any position on the water inlet guide rail lifting frame 2 and the water outlet guide rail lifting frame 12.

[0046] In the movable heat exchange tube row sealing system, the water inlet sealing rod vertical sealing motor 6 and the water outlet sealing rod vertical sealing motor 14 respectively control the water inlet heat exchange tube row sealing rod 4 and the water outlet heat exchange tube row sealing rod 13 to move perpendicular to the condenser heat exchange tube sheet. When the water inlet heat exchange tube row sealing rod 4 and the water outlet heat exchange tube row sealing rod 13 are simultaneously vertically pressed against the heat exchange tube row of the condenser, the heat exchange tube row is sealed and isolated.

[0047] The joint-type pressure transmitter 5 in the inflation leak detection system can be used to detect the pressure of the condenser heat exchange tube row after being sealed and isolated by the water inlet heat exchange tube row sealing rod 4 and the water outlet heat exchange tube row sealing rod 13, and remotely transmit the pressure value to the inflation leak detection control device 10.

[0048] In the air filling leak detection system, the air compressor 9 can fill air of a certain pressure into the condenser heat exchange tube row after the sealing rod 4 of the water inlet heat exchange tube row and the sealing rod 13 of the water outlet heat exchange tube row are sealed and isolated.

[0049] As an optional solution, the water inlet guide rail lifting frame 2 and the water outlet guide rail lifting frame 12 both include vertical rods, on which are provided lifting mechanisms, which are driven by the water inlet lifting frame lifting motor 7 and the water outlet lifting frame lifting motor 15 to move up and down along the vertical rods.

[0050] The present invention also provides a leak detection method for a condenser heat exchange tube air-filled automatic leak detection device, comprising the following steps:

[0051] When the condenser leaks and the leaking water chamber is identified, the inflation leak detection control device 10 controls the air electric door 3 and the water discharge electric door 8 to open automatically;

[0052] After the circulating water in the condenser water chamber is discharged, the inflation leak detection control device 10 controls the water inlet lifting frame lifting motor 7 and the water outlet lifting frame lifting motor 15 to move synchronously, adjust the water inlet heat exchange tube row sealing rod 4 and the water outlet heat exchange tube row sealing rod 13 to the same heat exchange tube row height, and then the inflation leak detection control device 10 controls the water inlet sealing rod vertical sealing motor 6 and the water outlet sealing rod vertical sealing motor 14 to move synchronously, control the water inlet heat exchange tube row sealing rod 4 and the water outlet heat exchange tube row sealing rod 13 to be vertically close to the condenser inlet and outlet water chamber tube plates.

[0053] The inflation leak detection control device 10 controls the air compressor 9 to automatically inflate the space formed by the water inlet heat exchange tube row sealing rod 4, the water outlet heat exchange tube row sealing rod 13 and the condenser tube row, and detects the inflation pressure through the joint type pressure transmitter 5.

[0054] The leaking heat exchange tubes of the condenser can be automatically and accurately located at a certain row by inflating the condenser heat exchange tube rows and detecting the pressure reduction rate.

[0055] For example, when the pressure reaches 0.3-0.7 MPa, the air compressor 9 is stopped, and the air filling and leak detection control device 10 detects the pressure drop rate according to the pressure values ​​sent back by the joint-type pressure transmitter 5 at different times. When the pressure drop rate is ≥0.1 MPa / h, it is considered that there is a leak in the condenser heat exchange tube bank.

[0056] The method of using the present invention will be further described in detail below with reference to the accompanying drawings.

[0057] 1. During normal operation of the unit, the device is in standby mode, and the sealing rods 4 of the water inlet heat exchange tube row and the sealing rods 13 of the water outlet heat exchange tube row are located at the top of the water inlet guide rail lifting frame 2 and the water outlet guide rail lifting frame 12, which are higher than the position of the heat exchange tubes at the top of the condenser.

[0058] 2. When the condenser leaks and the leaking water chamber is identified, the inflation leak detection control device 10 controls the air electric door 3 and the water discharge electric door 8 to automatically open and drain the circulating water.

[0059] 3. The inflation leak detection control device 10 controls the water inlet lifting frame lifting motor 7 and the water outlet lifting frame lifting motor 15 to move synchronously, adjusts the water inlet heat exchange tube row sealing rod 4 and the water outlet heat exchange tube row sealing rod 13 to the same heat exchange tube row height, and then controls the water inlet sealing rod vertical sealing motor 6 and the water outlet sealing rod vertical sealing motor 14 to move synchronously, controls the water inlet heat exchange tube row sealing rod 4 and the water outlet heat exchange tube row sealing rod 13 to be vertically close to the condenser inlet and outlet chamber tube plates.

[0060] 4. The inflation leak detection control device 10 controls the air compressor 9 to automatically inflate the space formed by the water inlet heat exchange tube row sealing rod 4, the water outlet heat exchange tube row sealing rod 13 and the condenser tube row. The inflation pressure is detected by the joint-type pressure transmitter 5. The air compressor 9 is stopped when the pressure reaches 0.5 MPa.

[0061] 5. The inflation leak detection control device 10 detects the pressure drop rate based on the pressure values ​​sent back by the joint type pressure transmitter 5 at different times. When the pressure drop rate is ≥0.1MPa / h, it is considered that there is a leak in the condenser heat exchange tube bank.

[0062] 6. Restore the device to standby status.

[0063] It should be understood that the above description is for illustrative purposes only and is not intended to be limiting. 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 the present teachings 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 leak detection method for a condenser heat exchange tube automatic leak detection device with air filling, characterized in that: The leak detection device includes a mobile heat exchange tube bank sealing system and an inflation leak detection system; The movable heat exchange tube row sealing system comprises a water inlet guide rail lifting frame (2) and a water inlet lifting frame lifting motor (7) installed inside the cooling water inlet water chamber (1), and a water inlet heat exchange tube row sealing rod (4) and a water inlet sealing rod vertical sealing motor (6) installed on the water inlet guide rail lifting frame (2); It also includes a water outlet guide rail lifting frame (12) and a water outlet lifting frame lifting motor (15) installed inside the cooling water outlet water chamber (11), as well as a water outlet heat exchange pipe row sealing rod (13) and a water outlet sealing rod vertical sealing motor (14) installed on the water outlet guide rail lifting frame (12); The inflation leak detection system comprises a joint-type pressure transmitter (5) installed inside the sealing rod (4) of the water inlet heat exchange pipe row, an air compressor (9), and an inflation leak detection control device (10); The output end of the air compressor (9) is connected to the water inlet heat exchange pipe row sealing rod (4) for inflating the condenser heat exchange pipe row after the water inlet heat exchange pipe row sealing rod (4) and the water outlet heat exchange pipe row sealing rod (13) are sealed and isolated, and the inflation leak detection control device (10) is electrically connected to the joint type pressure transmitter (5); In the movable heat exchange tube row sealing system, the water inlet lifting frame lifting motor (7) and the water outlet lifting frame lifting motor (15) respectively control the water inlet heat exchange tube row sealing rod (4) and the water outlet heat exchange tube row sealing rod (13) to perform lifting movements on the water inlet guide rail lifting frame (2) and the water outlet guide rail lifting frame (12); The water inlet sealing rod vertical sealing motor (6) and the water outlet sealing rod vertical sealing motor (14) respectively control the water inlet heat exchange tube row sealing rod (4) and the water outlet heat exchange tube row sealing rod (13) to move vertically relative to the condenser heat exchange tube sheet; when the water inlet heat exchange tube row sealing rod (4) and the water outlet heat exchange tube row sealing rod (13) simultaneously vertically adhere to the condenser heat exchange tube row, the heat exchange tube row is sealed and isolated; Leak detection methods include: When the condenser leaks and the leaking water chamber is identified, after the circulating water in the condenser water chamber is discharged, the water inlet lifting frame lifting motor (7) and the water outlet lifting frame lifting motor (15) are synchronously operated to adjust the water inlet heat exchange tube row sealing rod (4) and the water outlet heat exchange tube row sealing rod (13) to the same heat exchange tube row height; the water inlet sealing rod vertical sealing motor (6) and the water outlet sealing rod vertical sealing motor (14) are synchronously operated to control the water inlet heat exchange tube row sealing rod (4) and the water outlet heat exchange tube row sealing rod (13) to be vertically close to the condenser water inlet and outlet chamber tube plates; The air filling leak detection control device (10) controls the air compressor (9) to automatically fill the space formed by the water inlet heat exchange tube row sealing rod (4), the water outlet heat exchange tube row sealing rod (13) and the condenser tube row with air, detects the filling pressure through the joint type pressure transmitter (5), and judges the leakage of the condenser heat exchange tube row by detecting the pressure drop rate; When the pressure reaches 0.3-0.7 MPa, the air compressor (9) is stopped, and the air charging and leak detection control device (10) detects the pressure drop rate. When the pressure drop rate is ≥0.1 MPa / h, it is considered that there is a leak in the condenser heat exchange tube bank.

2. The condenser heat exchange tube air filling automatic leak detection device according to claim 1, characterized in that: Also includes an automatic water release system; The automatic water discharge system comprises an air electric door (3) and a water discharge electric door (8) installed outside the cooling water inlet chamber (1); the air electric door (3) and the water discharge electric door (8) are both electrically connected to the inflation leak detection control device (10).

3. The condenser heat exchange tube air filling automatic leak detection device according to claim 1, characterized in that: The water inlet lifting frame lifting motor (7) and the water inlet sealing rod vertical sealing motor (6) are both electrically connected to the inflation leak detection control device (10).

4. The automatic leakage detection device for condenser heat exchange tubes by inflating gas according to claim 1, characterized in that: The water outlet lifting frame lifting motor (15) and the water outlet sealing rod vertical sealing motor (14) are both electrically connected to the inflation leak detection control device (10).

5. The automatic leakage detection device for condenser heat exchange tubes by inflating gas according to claim 1 is characterized by: The joint-type pressure transmitter (5) is used to detect the pressure of the condenser heat exchange tube row after being sealed and isolated by the water inlet heat exchange tube row sealing rod (4) and the water outlet heat exchange tube row sealing rod (13).

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