A gas detection-based condenser leakage pipe online positioning system and method

Abstract

The invention discloses an online positioning system and method for a condenser leakage pipe based on gas detection. The inlet of a vacuum pump is connected to an air cooling zone on the steam side of the condenser, and the outlet of the vacuum pump is connected to a leak detector via a gas inhaler; a water chamber drain electric valve is connected to the bottom of a circulating water inlet water chamber or the bottom of a circulating water outlet water chamber; a circulating water inlet pipeline is connected to a circulating water inlet water chamber via a circulating water inlet electric butterfly valve, a circulating water outlet pipe is connected to a circulating water outlet water chamber via a circulating water outlet electric butterfly valve, and a water chamber liquid level meter is arranged in the circulating water outlet water chamber or the circulating water inlet water chamber; the outlet of an air supply cylinder is connected to the top of a circulating water inlet water chamber and the top of a circulating water outlet water chamber in the condenser via an air supply and air pipeline mixer and a mixed gas supply electric shut-off valve in sequence. The system and method can find the position of the condenser leakage pipe online during the period when the leakage side of the condenser is out of operation and drained.

Description

Technical Field

[0001] The invention belongs to the technical field of condenser leakage detection, and relates to an online positioning system and method for a condenser leakage pipe based on gas detection. Background Art

[0002] The condenser is an important equipment of the generator set. When the condenser leaks, the condensate will be contaminated, the water vapor quality of the thermal system will deteriorate, and the thermal system equipment will be seriously corroded, scaled, and salted, threatening the safe operation of the unit.

[0003] There are two main leak detection technologies for condenser leaking pipes: manual inspection and water filling inspection. Manual inspection requires manual entry into the condenser water chamber after shutdown to check tens of thousands of heat exchange tubes. The maintenance workload is very large. When the condenser is half-operating, manual inspection methods are used to check for leaks. The inside of the condenser water chamber is in a high temperature and high humidity environment, which poses a major safety problem. Water filling inspection requires filling the steam side of the condenser with water, and manually entering the condenser water chamber to observe the leakage of the condenser heat exchange tube to locate the leaking tube. This method can only detect larger leaks, but is powerless for minor leaks, and will cause a large waste of water resources.

[0004] When a condenser leaks, the half condenser with the leak is usually shut down and the circulating water of the condenser on that side is drained. At this time, the unit can carry 75% load without shutting down. If the location of the condenser leakage pipe can be found online during the period when the condenser leakage side is shut down and the water is drained, it will greatly save the workload of leak detection of the condenser leakage pipe, break the dilemma of shutting down the condenser leakage pipe for manual inspection, and is of great significance for the unit to resume normal operation as soon as possible and ensure the economic operation of the unit. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide an online positioning system and method for a condenser leakage pipe based on gas detection, which can find the position of the condenser leakage pipe online during the period when the condenser leakage side is out of operation and drained.

[0006] To achieve the above-mentioned purpose, the gas detection-based condenser leakage pipe online positioning system of the present invention includes an automatic gas supply system, an air extraction detection system and an automatic water discharge system; the automatic gas supply system includes a gas supply and air pipeline mixer and a mixed gas supply electric shut-off valve; the air extraction detection system includes a condenser steam side, a vacuum pump, a leak detector air inlet electric shut-off valve, a gas inhaler and a leak detector; the automatic water discharge system includes a circulating water inlet electric butterfly valve, a circulating water inlet water chamber, a circulating water outlet water chamber, a water chamber water discharge electric valve, a water chamber liquid level gauge and a circulating water outlet electric butterfly valve;

[0007] The inlet of the mixed gas supply electric shut-off valve is connected to the air supply and air pipeline mixer, and the outlet of the mixed gas supply electric shut-off valve is connected to the top of the circulating water inlet water chamber and the top of the circulating water outlet water chamber in the condenser; the inlet of the vacuum pump is connected to the air cooling area on the steam side of the condenser, and the outlet of the vacuum pump is connected to the leak detector through the leak detector air inlet electric shut-off valve and the gas inhaler; the water chamber drain electric valve is connected to the bottom of the circulating water inlet water chamber or the bottom of the circulating water outlet water chamber; the circulating water inlet pipeline is connected to the circulating water inlet water chamber through the circulating water inlet electric butterfly valve, and the circulating water outlet pipe is connected to the circulating water outlet water chamber through the circulating water outlet electric butterfly valve, and the water chamber liquid level meter is arranged outside the circulating water inlet water chamber or the circulating water outlet water chamber.

[0008] The automatic gas supply system also includes a gas supply cylinder, a gas cylinder outlet angle valve, a pressure reducing valve, a gas supply electric shut-off valve, a gas supply flow regulating valve and a flow meter; the outlet of the gas supply cylinder is connected to the top of the circulating water inlet water chamber and the top of the circulating water outlet water chamber in the condenser via the gas cylinder outlet angle valve, the pressure reducing valve, the gas supply electric shut-off valve, the gas supply flow regulating valve, the flow meter, the gas supply and air pipeline mixer and the mixed gas supply electric shut-off valve.

[0009] The air supply and air line mixers are venturi mixers.

[0010] The water chamber drain electric valve is an electric regulating valve, which is located at the bottom of the circulating water inlet water chamber or the circulating water outlet water chamber.

[0011] The method for online positioning of a condenser leakage pipe based on gas detection of the present invention comprises the following steps:

[0012] When the condenser leaks, close the circulating water inlet electric butterfly valve and the circulating water outlet electric butterfly valve, isolate the leaking condenser, open the mixed gas supply electric shut-off valve, open the gas cylinder outlet angle valve, open the gas supply electric shut-off valve, adjust the outlet pressure of the pressure reducing valve to 0.1-0.2MPa, adjust the opening of the gas supply flow regulating valve, control the flow rate detected by the flow meter to 100-300L / h, and mix the leak detection gas and air in the gas supply and air pipeline mixer according to the preset ratio to form the leak pipe positioning gas, and then pass it into the circulating water inlet water chamber and the circulating water outlet water chamber;

[0013] While supplying air to the circulating water inlet chamber and the circulating water outlet chamber, open the water chamber drain electric valve, set the initial opening of the water chamber drain electric valve, monitor the change of the condenser circulating water level through the water chamber level gauge, and calculate the decreasing speed v of the circulating water level within the time period every first preset time. 实际 , given the circulating water level reduction speed setting value v 设定 , given the decreasing speed deviation value Δv of circulating water level, when |v 实际 -v 设定When ∣≤Δv, the current opening of the water chamber drain electric valve remains unchanged. 实际 -v 设定 ∣>Δv, when v 实际 >v 设定 , then the opening of the N% water chamber drain electric valve is reduced every second preset time. 实际 <v 设定 , then the opening of the N% water chamber drain electric valve is increased every third preset time to keep the decreasing speed of the circulating water level stable;

[0014] While draining the circulating water inlet chamber and the circulating water outlet chamber, open the leak detector air inlet electric shut-off valve, start the gas aspirator and the leak detector. When the circulating water level drops to the position of the leaking pipe row, the leak detection gas enters the steam side of the condenser through the leakage hole of the leakage pipe. The vacuum pump extracts the leak detection gas leaked to the steam side of the condenser, and then uses the leak detector to detect changes in the leak detection gas concentration. When the change value of the leak detection gas concentration of the leak detector exceeds the set value, the position of the leaking pipe row is located according to the height detected by the water chamber level gauge.

[0015] The leak detection gas is helium or hydrogen, etc., which has a low content in the air and is easy to detect, preferably helium.

[0016] Given the lowering speed setting value v of the circulating water level 设定 10-20mm / min;

[0017] Calculate the decreasing speed v of circulating water level every 30-60s 实际 ;

[0018] The initial opening of the electric valve for draining water from the given water chamber is 10%-30%;

[0019] Every 10-30 seconds, reduce the opening of the water chamber drain electric valve by 1-5%;

[0020] Increase the opening of the water chamber drain electric valve by 1-5% every 10-30 seconds;

[0021] N is 1-5.

[0022] The present invention has the following beneficial effects:

[0023] In the specific operation of the gas detection-based condenser leakage pipe online positioning system and method described in the present invention, the leakage detection gas and air are mixed in the air supply and air pipeline mixer according to a preset ratio to form the leakage pipe positioning gas, and then introduced into the circulating water inlet water chamber and the circulating water outlet water chamber. During this process, the opening of the water discharge electric valve is controlled to achieve stable drainage of the circulating water leakage side. In this process, the leak detector air inlet electric shut-off valve is opened, the gas inhaler and the leak detector are started, and when the circulating water level is lowered to the position of the leakage pipe row, the leakage detection gas enters the steam side of the condenser through the leakage hole of the leakage pipe, that is, when the leak detector detects the leakage When the change in gas concentration exceeds the set value, the position of the leaking pipe row is located according to the height detected by the water chamber liquid level gauge, so that the position of the condenser leakage pipe can be found online during the period when the condenser leakage side is out of operation and the water is drained. The vacuum pump of this method has a fast air extraction speed and can quickly find the position of the condenser leakage pipe row; the gas detection device has a high resolution for changes in gas concentration and can find tiny leaks in the condenser heat exchange tubes; it realizes online automatic leak detection of the condenser leakage pipe, greatly saves the workload of leak detection of the condenser leakage pipe, breaks the dilemma that the condenser leakage pipe must be shut down for manual inspection, and improves work safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 It is a double-axis curve diagram of tube row position-helium mass spectrometer leak detector detection value-leaking tube row height.

[0026] Among them, 1 is the gas supply cylinder, 2 is the gas cylinder outlet angle valve, 3 is the pressure reducing valve, 4 is the gas supply electric shut-off valve, 5 is the gas supply flow regulating valve, 6 is the flow meter, 7 is the gas supply and air pipeline mixer, 8 is the mixed gas supply electric shut-off valve, 9 is the circulating water inlet electric butterfly valve, 10 is the circulating water inlet water chamber, 11 is the condenser steam side, 12 is the water chamber drain electric valve, 13 is the circulating water outlet water chamber, 14 is the circulating water outlet electric butterfly valve, 15 is the water chamber level gauge, 16 is the vacuum pump, 17 is the leak detector air inlet electric shut-off valve, 18 is the gas inhaler, and 19 is the leak detector. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only an embodiment of a part of the present invention, not all embodiments, and is not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concepts disclosed in the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present invention.

[0028] The accompanying drawings show schematic diagrams of structures according to embodiments disclosed in the present invention. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0029] refer to Figure 1 and Figure 2 , the condenser leakage pipe online positioning system based on gas detection of the present invention comprises an automatic gas supply system, a gas extraction detection system and an automatic water discharge system;

[0030] The automatic gas supply system includes a gas supply cylinder 1, a gas cylinder outlet angle valve 2, a pressure reducing valve 3, a gas supply electric shut-off valve 4, a gas supply flow regulating valve 5, a flow meter 6, a gas supply and air pipeline mixer 7 and a mixed gas supply electric shut-off valve 8;

[0031] The air extraction detection system includes a condenser steam side 11, a vacuum pump 16, a leak detector air intake electric shut-off valve 17, a gas inhaler 18 and a leak detector 19;

[0032] The automatic water discharge system comprises a circulating water inlet electric butterfly valve 9, a circulating water inlet water chamber 10, a circulating water outlet water chamber 13, a water chamber water discharge electric valve 12, a water chamber liquid level meter 15 and a circulating water outlet electric butterfly valve 14.

[0033] The outlet of the gas supply cylinder 1 is connected to the top of the circulating water inlet water chamber 10 and the top of the circulating water outlet water chamber 13 in the condenser through the cylinder outlet angle valve 2, the pressure reducing valve 3, the gas supply electric shut-off valve 4, the gas supply flow regulating valve 5, the flow meter 6, the gas supply and air pipeline mixer 7 and the mixed gas supply electric shut-off valve 8 in sequence, wherein the gas supply and air pipeline mixer 7 is a Venturi mixer. When working, the flow of the leak detection gas is changed by adjusting the gas supply flow regulating valve 5, and then the mixing ratio of the leak detection gas and air is adjusted.

[0034] The inlet of the vacuum pump 16 is connected to the air cooling area of ​​the steam side 11 of the condenser, and the outlet of the vacuum pump 16 is connected to the leak detector 19 via the leak detector air inlet electric shut-off valve 17 and the gas suction device 18 in sequence.

[0035] The water chamber drain electric valve 12 is connected to the bottom of the circulating water inlet water chamber 10 or the bottom of the circulating water outlet water chamber 13. The water chamber drain electric valve 12 is an electric regulating valve, which controls the liquid level reduction speed of the condenser circulating water chamber by adjusting the opening of the water chamber drain electric valve 12, and the condensed water on the condenser circulating water side can be completely drained through it.

[0036] The circulating water inlet pipe is connected to the circulating water inlet water chamber 10 via the circulating water inlet electric butterfly valve 9, and the circulating water outlet pipe is connected to the circulating water outlet water chamber 13 via the circulating water outlet electric butterfly valve 14. A water chamber liquid level meter 15 is provided inside the circulating water outlet water chamber 13 or outside the circulating water inlet water chamber 10.

[0037] The method for online positioning of a condenser leakage pipe based on gas detection of the present invention comprises the following steps:

[0038] When the condenser leaks, close the circulating water inlet electric butterfly valve 9 and the circulating water outlet electric butterfly valve 14, isolate the leaking condenser, open the mixed gas supply electric shut-off valve 8, open the gas cylinder outlet angle valve 2, open the gas supply electric shut-off valve 4, adjust the outlet pressure of the pressure reducing valve 3 to 0.1-0.2MPa, adjust the opening of the gas supply flow regulating valve 5, control the flow rate detected by the flowmeter 6 to 100-300L / h, and the leak detection gas and air are mixed into the leak pipe positioning gas in the gas supply and air pipeline mixer 7 according to the preset ratio and then introduced into the circulating water inlet water chamber 10 and the circulating water outlet water chamber 13;

[0039] While supplying air to the circulating water inlet chamber 10 and the circulating water outlet chamber 13, the water chamber drain electric valve 12 is opened, and the initial opening of the water chamber drain electric valve 12 is set to 10%-30%. The change of the condenser circulating water level is monitored by the water chamber level meter 15, and the decreasing speed v of the circulating water level is calculated every 30-60s. 实际 , given the circulating water level reduction speed setting value v 设定 is 10-20mm / min, given the decreasing speed deviation value Δv of the circulating water level, when |v 实际 -v 设定 When ∣≤Δv, the current opening of the water chamber drain electric valve 12 is kept unchanged. 实际 -v 设定 ∣>Δv, when v 实际 >v 设定 , then the opening of the water chamber drain electric valve 12 is reduced by 1-5% every 10-30 seconds. 实际 <v设定 , then the opening of the water chamber drain electric valve 12 is increased by 1-5% every 10-30 seconds to keep the circulating water level lowering speed stable and ensure the stability of the positioning deviation;

[0040] While the circulating water inlet water chamber 10 and the circulating water outlet water chamber 13 are drained, the leak detector air inlet electric shut-off valve 17 is opened, and the gas inhaler 18 and the leak detector 19 are started. When the circulating water level drops to the position of the leaking pipe row, the leak detection gas enters the steam side 11 of the condenser through the leak hole of the leaking pipe, and the vacuum pump 16 extracts the leak detection gas leaking to the steam side 11 of the condenser, and then the leak detection gas concentration change is detected by the leak detector 19. When the change value of the leak detection gas concentration of the leak detector 19 exceeds the set value, the position of the leaking pipe row is located by the height detected by the water chamber level gauge 15. When the circulating water of the leaking side condenser is drained, the leaking heat exchange pipe is blocked, and the maintenance personnel enter the condenser water chamber to spray a small amount of leak detection gas into each condenser heat exchange pipe at the height of the leaking pipe row, and complete the final positioning of the leaking heat exchange pipe according to the concentration change detected by the leak detector 19, and block the leaking heat exchange pipe at the same time.

[0041] The leak detection gas is a gas such as helium or hydrogen which has a low content in the air and is easy to detect, preferably an inert gas such as helium.

[0042] Embodiment 1

[0043] When the condenser leakage side is determined, the operator closes the circulating water inlet electric butterfly valve 9 and the circulating water outlet electric butterfly valve 14, isolates the leakage side halfway, and confirms that the vacuum pump 16 is in the open state, the pressure of the 40L helium supply cylinder 1 is >5MPa, and the cylinder outlet angle valve 2 is in the open state;

[0044] Automatically open the mixed gas supply electric shut-off valve 8 and the gas supply electric shut-off valve 4, adjust the outlet pressure of the pressure reducing valve 3 to 0.1MPa, adjust the opening of the gas supply flow regulating valve 5, control the flow rate detected by the flow meter 6 to be 200L / h, and simultaneously introduce the mixed gas of helium and air into the circulating water inlet water chamber 10 and the circulating water outlet water chamber 13 through the gas supply and air pipeline mixer 7;

[0045] While supplying air to the circulating water inlet chamber 10 and the circulating water outlet chamber 13, the water chamber drain electric valve 12 is opened, and the initial opening of the water chamber drain electric valve 12 is set to 30%. The liquid level change of the condenser circulating water is monitored by the water chamber level meter 15. The decreasing speed of the circulating water level is calculated every 60 seconds as v. 实际 , given the circulating water level reduction speed setting value v 设定 is 15mm / min, given that the circulating water level reduction speed deviation Δv is 3mm / min, when |v 实际-15mm / min∣≤3mm / min, the current opening of the water chamber drain electric valve 12 is kept unchanged. 实际 -15mm / min∣>3mm / min, if v 实际 >15mm / min, reduce the opening of the water chamber drain electric valve 12 by 2% every 20s. If v 实际 <15mm / min, then increase the opening of the water chamber drain electric valve 12 by 2% every 20s to keep the liquid level lowering speed stable and ensure the stability of the positioning deviation;

[0046] While the circulating water inlet water chamber 10 and the circulating water outlet water chamber 13 are being drained, the leak detector air inlet electric shut-off valve 17 is opened, the gas inhaler 18 and the helium mass spectrometer leak detector 19 are started, and when the circulating water level drops to the position of the leaking pipe row, the helium enters the steam side 11 of the condenser through the leakage hole of the leaking pipe, the vacuum pump 16 extracts the helium and detects the change of the helium concentration through the helium mass spectrometer leak detector 19, and when the change value of the helium concentration exceeds the set value, the position of the leaking pipe row can be located by the height detected by the water chamber level meter 15. After the circulating water of the condenser on the leaking side is drained, the leaking heat exchange pipe is blocked, and the maintenance personnel enter the condenser water chamber and use a helium belt or a helium spray gun to spray a small amount of helium into each condenser heat exchange pipe at the height of the leaking pipe row, and quickly complete the final positioning of the leaking heat exchange pipe according to the change of the helium concentration detected by the helium mass spectrometer leak detector 19, and block the leaking heat exchange pipe at the same time.

Claims

1. A condenser leakage pipe online positioning system based on gas detection, characterized in that: It comprises an automatic air supply system, an air extraction detection system and an automatic water discharge system; the automatic air supply system comprises an air supply and air pipeline mixer (7) and a mixed air supply electric shut-off valve (8); the air extraction detection system comprises a condenser steam side (11), a vacuum pump (16), a leak detector air intake electric shut-off valve (17), a gas inhaler (18) and a leak detector (19); the automatic water discharge system comprises a circulating water inlet electric butterfly valve (9), a circulating water inlet water chamber (10), a circulating water outlet water chamber (13), a water chamber water discharge electric valve (12), a water chamber liquid level meter (15) and a circulating water outlet electric butterfly valve (14); The inlet of the mixed gas supply electric shutoff valve (8) is connected to the gas supply and air pipeline mixer (7), and the outlet of the mixed gas supply electric shutoff valve (8) is connected to the top of the circulating water inlet water chamber (10) and the top of the circulating water outlet water chamber (13) in the condenser; the inlet of the vacuum pump (16) is connected to the air cooling area on the steam side (11) of the condenser, and the outlet of the vacuum pump (16) is connected to the leak detector (19) through the leak detector air inlet electric shutoff valve (17) and the gas inhaler (18). The water chamber drain electric valve (12) is connected to the bottom of the circulating water inlet water chamber (10) or the bottom of the circulating water outlet water chamber (13); the circulating water inlet pipeline is connected to the circulating water inlet water chamber (10) via the circulating water inlet electric butterfly valve (9), and the circulating water outlet pipe is connected to the circulating water outlet water chamber (13) via the circulating water outlet electric butterfly valve (14); the water chamber liquid level meter (15) is arranged outside the circulating water inlet water chamber (10) or the circulating water outlet water chamber (13).

2. The condenser leakage pipe online positioning system based on gas detection according to claim 1 is characterized in that: The automatic gas supply system also includes a gas supply cylinder (1), a gas cylinder outlet angle valve (2), a pressure reducing valve (3), a gas supply electric shut-off valve (4), a gas supply flow regulating valve (5) and a flow meter (6); the outlet of the gas supply cylinder (1) is connected to the top of the circulating water inlet water chamber (10) and the top of the circulating water outlet water chamber (13) in the condenser via the gas cylinder outlet angle valve (2), the pressure reducing valve (3), the gas supply electric shut-off valve (4), the gas supply flow regulating valve (5), the flow meter (6), the gas supply and air pipeline mixer (7) and the mixed gas supply electric shut-off valve (8).

3. The condenser leakage pipe online positioning system based on gas detection according to claim 1 is characterized in that: The air supply and air line mixer (7) is a Venturi mixer.

4. The condenser leakage pipe online positioning system based on gas detection according to claim 1 is characterized in that: The water chamber drain electric valve (12) is an electric regulating valve, and is located at the bottom of the circulating water inlet water chamber (10) or the circulating water outlet water chamber (13).

5. A method for online positioning of a condenser leakage pipe based on gas detection, characterized in that: The gas detection-based online positioning system for condenser leakage pipes according to claim 2 comprises the following steps: When a leakage occurs on the condenser side, the circulating water inlet electric butterfly valve (9) and the circulating water outlet electric butterfly valve (14) are closed to isolate the condenser on the leakage side, the mixed gas supply electric shut-off valve (8) is opened, the gas cylinder outlet angle valve (2) is opened, the gas supply electric shut-off valve (4) is opened, the outlet pressure of the pressure reducing valve (3) is adjusted to 0.1-0.2MPa, the opening of the gas supply flow regulating valve (5) is adjusted, and the flow rate detected by the flow meter (6) is controlled to be 100-300L / h. The leak detection gas and air are mixed in the gas supply and air pipeline mixer (7) according to a preset ratio to form the leak pipe positioning gas, and then introduced into the circulating water inlet water chamber (10) and the circulating water outlet water chamber (13); While supplying gas into the circulating water inlet water chamber (10) and the circulating water outlet water chamber (13), open the electric valve (12) for draining water from the water chamber, set the initial opening degree of the electric valve (12) for draining water from the water chamber, monitor the change of the circulating water level in the condenser through the water chamber level gauge (15), and calculate the reduction rate v of the circulating water level within this time period every first preset time. 实际 , set the set value v of the reduction rate of the circulating water level. 设定 , set the deviation value Δv of the reduction rate of the circulating water level. When |v 实际 - v 设定 | ≤ Δv, keep the current opening degree of the electric valve (12) for draining water from the water chamber unchanged. When |vactual - vset| > Δv, if vactual > vset, close the opening degree of the electric valve (12) for draining water from the water chamber by N% every second preset time. If vactual < vset, open the opening degree of the electric valve (12) for draining water from the water chamber by N% every third preset time to keep the reduction rate of the circulating water level stable. While the circulating water inlet water chamber (10) and the circulating water outlet water chamber (13) are drained, the leak detector air inlet electric shut-off valve (17) is opened, and the gas suction device (18) and the leak detector (19) are started. When the circulating water level drops to the position of the leaking pipe row, the leak detection gas enters the steam side (11) of the condenser through the leakage hole of the leaking pipe, and the vacuum pump (16) extracts the leak detection gas leaked to the steam side (11) of the condenser, and then the change of the leak detection gas concentration is detected by the leak detector (19). When the change value of the leak detection gas concentration of the leak detector (19) exceeds the set value, the position of the leaking pipe row is located according to the height detected by the water chamber liquid level meter (15).

6. The method for online positioning of a condenser leakage pipe for gas detection according to claim 5, characterized in that: The leak detection gas is helium or hydrogen, etc., which has a low content in the air and is easy to detect, preferably helium.

7. The method for online positioning of a condenser leakage pipe for gas detection according to claim 5, characterized in that: Given the lowering speed setting value v of the circulating water level 设定 10-20mm / min; Calculate the decreasing speed v of circulating water level every 30-60s 实际 ; The initial opening degree of the given water chamber drain electric valve (12) is 10%-30%.

8. The method for online positioning of a condenser leakage pipe for gas detection according to claim 5, characterized in that: Every 10-30 seconds, the opening of the water chamber drain electric valve (12) is reduced by 1-5%; Every 10-30 seconds, the opening of the water chamber drain electric valve (12) is increased by 1-5%; N is 1-5.

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