A condenser leaking pipe row positioning device and a corresponding leaking pipe row positioning method

Abstract

The invention discloses a condenser leakage pipe row positioning device and a corresponding leakage pipe row positioning method. The device comprises: an exhaust valve, a circulating water drain valve, a circulating water reflux valve, a circulating water level meter, a camera, a condensate hydrogen conductivity meter, and a condenser leakage pipe row positioning control cabinet. The device can realize online rapid and accurate positioning of the condenser leakage pipe row. When a condenser on a certain side leaks, the condenser leakage pipe row positioning control cabinet is used to close the circulating water outlet butterfly valve and the inlet butterfly valve of the leaking condenser, open the exhaust valve, adjust the circulating water drain valve and the circulating water reflux valve, control the circulating water level of the condenser water chamber to drop and then rise, determine the leakage pipe row according to the change of the condensate hydrogen conductivity, and use the condenser water chamber circulating water level height measured by the level meter and the camera to locate the position of the leakage pipe row. The invention has the characteristics of high efficiency, rapidity and reliability. Compared with the commonly used leakage pipe row positioning method, it has high accuracy and strong reliability, and greatly saves time, manpower and funds.

Description

Technical Field

[0001] The invention relates to the field of water chemistry detection in power plants, and in particular to a condenser leakage pipe row positioning device and a corresponding leakage pipe row positioning method. Background Art

[0002] In a thermal power plant, the condenser cools the exhaust steam of the steam turbine into condensate through circulating cooling water for continued use by the boiler. When a condenser leaks, the cooling water in the heat exchange tube bank leaks into the condensate and enters the boiler, causing the quality of steam and water to deteriorate, causing scaling and corrosion of thermal equipment, affecting the thermal efficiency and safe and stable operation of the unit. Therefore, after a condenser leaks, it is of great significance to quickly locate the leaking tube bank.

[0003] At present, the commonly used methods for leak detection of condenser pipes are helium mass spectrometer leak detection technology and film covering method. Helium mass spectrometer leak detection technology is a vacuum leak detection method, which has many influencing factors, complex equipment operation, and is time-consuming. It requires a high level of technical skills of the staff and consumes a lot of manpower and funds. In the film covering method, due to the presence of fog, it is difficult to accurately determine the location of the leaking pipe. In addition, the above two methods require workers to enter the condenser through the manhole when leaking, which poses a certain risk to the personal safety of the workers. Summary of the invention

[0004] In order to make up for the shortcomings of the existing methods for locating leaking pipe rows, the purpose of the present invention is to provide a condenser leaking pipe row locating device and a corresponding leaking pipe row locating method, which can quickly, accurately and efficiently locate the position of the leaking pipe row when leakage occurs on one side of the condenser, reduce the difficulty of positioning, improve positioning accuracy, save manpower, funds and time.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A condenser leakage pipe row positioning device, comprising a circulating water outlet butterfly valve 1 arranged at the bottom of a condenser water chamber for discharging circulating water, a condensate hydrogen conductivity meter 3 arranged at the outlet of a condensate pump at the bottom of a condenser 2 for detecting the hydrogen conductivity of condensate, an exhaust valve 4 arranged at the top of the condenser water chamber for balancing the atmospheric pressure of the discharged water, a circulating water level meter 5 arranged at the top of the condenser water chamber for measuring the circulating water level of the water chamber, a circulating water drain valve 6 arranged at the bottom of the condenser water chamber for discharging circulating water, a camera 7 arranged at the top of the condenser water chamber for photographing the circulating water level of the condenser water chamber, a circulating water reflux valve 8 arranged on a pipeline connecting the condenser water chamber and a circulating water inlet for returning circulating water to the water chamber, a circulating water inlet butterfly valve 9 arranged on the circulating water inlet pipeline of the condenser water chamber, and also comprising a condenser leakage pipe row positioning control cabinet 10;

[0007] The condenser leakage pipe row positioning control cabinet 10 is connected to the circulating water outlet butterfly valve 1, the condensate hydrogen conductivity meter 3, the exhaust valve 4, the circulating water level meter 5, the circulating water drain valve 6, the camera 7 and the circulating water reflux valve 8;

[0008] The condenser leakage pipe row positioning control cabinet 10 can control the opening and closing of the exhaust valve 4, adjust the opening of the circulating water drain valve 6, control the camera 7 to take pictures, control the opening and closing of the circulating water return valve 8, and can display the condensate hydrogen conductivity measured by the condensate hydrogen conductivity meter 3 and the circulating water level height of the condenser water chamber measured by the circulating water level meter 5;

[0009] The circulating water level height of the condenser water chamber measured by the circulating water level meter 5 is the height of the heat exchange tube row. One level height corresponds to one heat exchange tube row. The position of the leaking tube row can be obtained through the circulating water level height of the condenser water chamber.

[0010] The circulating water level meter 5 is a radar level meter.

[0011] The condensed water hydrogen conductivity meter 3 is a conductivity meter with a cell constant of 0.01.

[0012] The corresponding leakage pipe row positioning method of the condenser leakage pipe row positioning device is described. After a heat exchange tube of a condenser 2 on one side leaks, the condenser on that side is isolated, the load of the unit where the condenser is located is reduced to below 70%, and the exhaust temperature of the low-pressure cylinder of the unit where the condenser is located is controlled not to exceed 55°C; the bypass of the high-pressure cylinder and the low-pressure cylinder of the unit where the condenser is located is switched to manual control, and the bypass is prohibited from being put into operation; according to seasonal operating conditions, the number of operating circulating water pumps of the unit where the condenser is located is adjusted; the condenser leakage pipe row positioning control cabinet 10 is used to close the circulating water outlet butterfly valve 1, close the circulating water inlet butterfly valve 9, open the exhaust valve 4, adjust the opening of the circulating water drain valve 6, and use the condensate The hydrogen conductivity meter 3 detects the hydrogen conductivity of the condensed water. When the hydrogen conductivity of the condensed water displayed by the condenser leakage pipe row positioning control cabinet 10 drops below 0.2μS / cm, the circulating water drain valve 6 is immediately closed, and the circulating water level height of the condenser water chamber measured by the circulating water level meter 5 displayed by the condenser leakage pipe row positioning control cabinet 10 is recorded, that is, the height of the heat exchange pipe row at this time. At the same time, the condenser leakage pipe row positioning control cabinet 10 is used to control the camera 7 to take pictures of the circulating water level and the heat exchange pipe row to determine that the leaking pipe row is a pipe above the heat exchange pipe row; then the circulating water reflux valve 8 is opened through the condenser leakage pipe row positioning control cabinet 10, and the reflux water is 1.5m 3 ~5m 3, which is the sum of the water volume in the water chamber at the height of a heat exchange tube row and the water volume in the heat exchange tube. After the reflux is completed, the circulating water reflux valve 8 is immediately closed using the condenser leakage tube row positioning control cabinet 10. After staying for 5 to 10 minutes, if the hydrogen conductivity of the condensed water does not increase, the circulating water reflux valve 8 is opened again through the condenser leakage tube row positioning control cabinet 10 to reflux the same amount of water until the hydrogen conductivity increases significantly and is greater than 0.2μS / cm. The height of the circulating water level in the condenser water chamber measured by the circulating water level meter 5 displayed by the condenser leakage tube row positioning control cabinet 10 is recorded. At the same time, the condenser leakage tube row positioning control cabinet 10 controls the camera 7 to take pictures and record the circulating water level in the condenser water chamber and the heat exchange tube row, and the heat exchange tube row at this height is determined to be the leaking tube row.

[0013] The condenser leakage pipe row positioning control cabinet 10 adjusts the opening of the circulating water drain valve 6, and the drain flow does not exceed 50m 3 / h.

[0014] The present invention has the following advantages:

[0015] 1. It can locate the leaking pipe row in real time online without stopping the unit and affecting the normal operation of the unit.

[0016] 2. Through the one-button operation of the condenser leakage pipe positioning control cabinet, the staff does not need to enter the condenser to perform complex operations of pipe leakage detection, which ensures the personal safety of the staff.

[0017] 3. The method of locating leaking pipes is simple and quick, with no restrictions on the technical level of the staff, saving manpower and funds.

[0018] 4. It can quickly and accurately locate the leaking pipe row, which is highly reliable and saves time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the condenser leakage pipe row positioning device of the present invention. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] like Figure 1As shown, the present invention provides a condenser leakage pipe row positioning device, comprising a circulating water outlet butterfly valve 1 arranged at the bottom of the condenser water chamber for discharging circulating water, a condensate hydrogen conductivity meter 3 arranged at the outlet of the condensate pump at the bottom of the condenser 2 for detecting the hydrogen conductivity of the condensate, an exhaust valve 4 arranged at the top of the condenser water chamber for balancing the atmospheric pressure of the drainage, a circulating water level meter 5 arranged at the top of the condenser water chamber for measuring the circulating water level in the water chamber, a circulating water drain valve 6 arranged at the bottom of the condenser water chamber for discharging circulating water, a camera 7 arranged at the top of the condenser water chamber for photographing the circulating water level in the condenser water chamber, a circulating water reflux valve 8 arranged on the pipeline connecting the condenser water chamber and the circulating water inlet for returning circulating water to the water chamber, a circulating water inlet butterfly valve 9 arranged on the circulating water inlet pipeline of the condenser water chamber, and also comprising a condenser A leakage pipe row positioning control cabinet 10; the condenser leakage pipe row positioning control cabinet 10 is connected to a circulating water outlet butterfly valve 1, a condensate hydrogen conductivity meter 3, an exhaust valve 4, a circulating water level meter 5, a circulating water drain valve 6, a camera 7 and a circulating water reflux valve 8; the condenser leakage pipe row positioning control cabinet 10 can control the opening and closing of the exhaust valve 4, adjust the opening of the circulating water drain valve 6, control the camera 7 to take pictures, and control the opening and closing of the circulating water reflux valve 8, and can display the condensate hydrogen conductivity measured by the condensate hydrogen conductivity meter 3 and the condenser water chamber circulating water level height measured by the circulating water level meter 5; the condenser water chamber circulating water level height measured by the circulating water level meter 5 is the height of the heat exchange tube row, and one level height corresponds to one heat exchange tube row. The position of the leakage pipe row is obtained through the condenser water chamber circulating water level height.

[0022] Example:

[0023] When the unit is shut down, the actual layout of the heat exchange tubes in the water chamber of the condenser 2 is investigated, and a layout model of the heat exchange tube rows in the condenser water chamber is drawn. The tube rows are laid out on the screen, and the corresponding relationship between the circulating water level height of the condenser water chamber measured by the circulating water level meter 5 and the heat exchange tube rows is established. The installation positions of the exhaust valve 4, the circulating water drain valve 6, the circulating water reflux valve 8, the circulating water level meter 5, and the camera 7 are determined and installed. The parameters are adjusted so that the circulating water level height of the condenser water chamber measured by the level meter 5 corresponds to the position of the tube row one by one. The calibrated height of each row of heat exchange tubes is the height of the top of the tube row, and the camera 7 is adjusted to face the circulating water level of the condenser water chamber, so that the liquid level position can be clearly reflected.

[0024] When condenser 2 leaks, perform the related operations of condenser leakage single-side isolation in accordance with the power plant operation procedures, reduce the load of the unit where the condenser is located to below 70%, and control the exhaust temperature of the low-pressure cylinder of the unit where the condenser is located not to exceed 55°C; switch the bypass of the high-pressure cylinder and low-pressure cylinder of the unit where the condenser is located to manual control, and prohibit the bypass from being put into operation; adjust the number of operating circulating water pumps of the unit where the condenser is located according to seasonal operating conditions; use the condenser leakage pipe row positioning control cabinet 10 to close the circulating water outlet butterfly valve 1, close the circulating water inlet butterfly valve 9, open the exhaust valve 4, adjust the opening of the circulating water drain valve 6, and use the condensate hydrogen conductivity meter 3 to detect the condensate When the hydrogen conductivity of condensed water displayed by the condenser leakage pipe row positioning control cabinet 10 drops below 0.2μS / cm, immediately close the circulating water drain valve 6, record the circulating water level height of the condenser water chamber measured by the circulating water level meter 5 displayed by the condenser leakage pipe row positioning control cabinet 10, that is, the height of the heat exchange tube row at this time, and use the condenser leakage pipe row positioning control cabinet 10 to control the camera 7 to take pictures of the circulating water level and the heat exchange tube row, and determine that the leaking pipe row is a pipe above the heat exchange tube row; then open the circulating water reflux valve 8 through the condenser leakage pipe row positioning control cabinet 10, and reflux water 1.5m 3 ~5m 3 , which is the sum of the water volume in the water chamber at the height of a heat exchange tube row and the water volume in the heat exchange tube. After the reflux is completed, the circulating water reflux valve 8 is immediately closed using the condenser leakage tube row positioning control cabinet 10. After staying for 5 to 10 minutes, if the hydrogen conductivity of the condensed water does not increase, the circulating water reflux valve 8 is opened again through the condenser leakage tube row positioning control cabinet 10 to reflux the same amount of water until the hydrogen conductivity increases significantly and is greater than 0.2μS / cm. The height of the circulating water level in the condenser water chamber measured by the circulating water level meter 5 displayed by the condenser leakage tube row positioning control cabinet 10 is recorded. At the same time, the condenser leakage tube row positioning control cabinet 10 controls the camera 7 to take pictures and record the circulating water level in the condenser water chamber and the heat exchange tube row, and the heat exchange tube row at this height is determined to be the leaking tube row.

[0025] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A condenser leaking pipe row positioning device, characterized in that: The invention comprises a circulating water outlet butterfly valve (1) arranged at the bottom of the condenser water chamber for discharging circulating water, a condensate hydrogen conductivity meter (3) arranged at the outlet of the condensate pump at the bottom of the condenser (2) for detecting the hydrogen conductivity of condensate, an exhaust valve (4) arranged at the top of the condenser water chamber for balancing the atmospheric pressure of the discharged water, a circulating water level meter (5) arranged at the top of the condenser water chamber for measuring the circulating water level in the water chamber, a circulating water drain valve (6) arranged at the bottom of the condenser water chamber for discharging circulating water, a camera (7) arranged at the top of the condenser water chamber for photographing the circulating water level in the condenser water chamber, a circulating water reflux valve (8) arranged on a pipeline connecting the condenser water chamber and the circulating water inlet for returning circulating water to the water chamber, a circulating water inlet butterfly valve (9) arranged on the circulating water inlet pipeline of the condenser water chamber, and also comprises a condenser leakage pipe row positioning control cabinet (10); The condenser leakage pipe row positioning control cabinet (10) is connected to the circulating water outlet butterfly valve (1), the condensate hydrogen conductivity meter (3), the exhaust valve (4), the circulating water level meter (5), the circulating water drain valve (6), the camera (7) and the circulating water reflux valve (8); The condenser leakage pipe row positioning control cabinet (10) can control the opening and closing of the exhaust valve (4), adjust the opening of the circulating water drain valve (6), control the camera (7) to take pictures, and control the opening and closing of the circulating water return valve (8), and can display the condensate hydrogen conductivity measured by the condensate hydrogen conductivity meter (3) and the circulating water level height of the condenser water chamber measured by the circulating water level meter (5); The circulating water level height of the condenser water chamber measured by the circulating water level meter (5) is the height of the heat exchange tube row. One level height corresponds to one heat exchange tube row. The position of the leaking tube row can be obtained through the circulating water level height of the condenser water chamber. The method for locating a corresponding leakage pipe row of a condenser leakage pipe row positioning device is as follows: after a heat exchange tube of a condenser (2) on one side leaks, the condenser on that side is isolated, the load of the unit where the condenser is located is reduced to below 70%, and the exhaust temperature of the low-pressure cylinder of the unit where the condenser is located is controlled not to exceed 55°C; the bypass of the high-pressure cylinder and the low-pressure cylinder of the unit where the condenser is located is switched to manual control, and the bypass is prohibited from being put into operation; the number of operating circulating water pumps of the unit where the condenser is located is adjusted according to seasonal working conditions; the circulating water outlet butterfly valve (1) is closed using the condenser leakage pipe row positioning control cabinet (10), the circulating water inlet butterfly valve (9) is closed, the exhaust valve (4) is opened, the opening of the circulating water drain valve (6) is adjusted, and the condensate hydrogen conductivity is used to measure the circulating water outlet butterfly valve (1 ... circulating water hydrogen conductivity is used to measure the circulating water outlet butterfly valve (1), the circulating water inlet butterfly valve (9) is closed, the exhaust valve (4) is opened, the opening of the circulating water drain valve (6) is The hydrogen conductivity of the condensed water is detected by the rate meter (3). When the hydrogen conductivity of the condensed water displayed by the condenser leakage pipe row positioning control cabinet (10) drops below 0.2μS / cm, the circulating water drain valve (6) is immediately closed, and the circulating water level height of the condenser water chamber measured by the circulating water level meter (5) displayed by the condenser leakage pipe row positioning control cabinet (10) is recorded, that is, the height of the heat exchange pipe row at this time. At the same time, the condenser leakage pipe row positioning control cabinet (10) is used to control the camera (7) to take pictures of the circulating water level and the heat exchange pipe row to determine that the leaking pipe row is a pipe above the heat exchange pipe row; then the circulating water return valve (8) is opened through the condenser leakage pipe row positioning control cabinet (10), and the return water is 1.5m 3 ~5m 3 , which is the sum of the water volume in the water chamber at the height of a heat exchange tube row and the water volume in the heat exchange tube. After the reflux is completed, the circulating water reflux valve (8) is immediately closed using the condenser leakage tube row positioning control cabinet (10). After 5 to 10 minutes, if the hydrogen conductivity of the condensed water does not increase, the circulating water reflux valve (8) is opened again through the condenser leakage tube row positioning control cabinet (10) to reflux the same amount of water until the hydrogen conductivity increases significantly and is greater than 0.2 μS / cm. The height of the circulating water level in the condenser water chamber measured by the circulating water level meter (5) displayed by the condenser leakage tube row positioning control cabinet (10) is recorded. At the same time, the condenser leakage tube row positioning control cabinet (10) controls the camera (7) to take photos and record the circulating water level in the condenser water chamber and the heat exchange tube row. The heat exchange tube row at this height is determined to be the leaking tube row.

2. The condenser leakage pipe row positioning device according to claim 1, characterized in that: The circulating water level meter (5) is a radar level meter.

3. The condenser leakage pipe row positioning device according to claim 1, characterized in that: The condensed water hydrogen conductivity meter (3) is a conductivity meter with an electrode constant of 0.

01.

4. The condenser leakage pipe row positioning device according to claim 1, characterized in that: The condenser leakage pipe row positioning control cabinet (10) adjusts the opening of the circulating water drain valve (6), and the drain flow rate does not exceed 50m 3 / h.

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