CN115420435A - Online leakage detection device and method for heat exchange tube of condenser of thermal power unit - Google Patents
Online leakage detection device and method for heat exchange tube of condenser of thermal power unit Download PDFInfo
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- CN115420435A CN115420435A CN202211064253.6A CN202211064253A CN115420435A CN 115420435 A CN115420435 A CN 115420435A CN 202211064253 A CN202211064253 A CN 202211064253A CN 115420435 A CN115420435 A CN 115420435A
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- heat exchange
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- helium
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- 238000001514 detection method Methods 0.000 title claims abstract description 75
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000001307 helium Substances 0.000 claims abstract description 60
- 229910052734 helium Inorganic materials 0.000 claims abstract description 60
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims abstract description 57
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000002985 plastic film Substances 0.000 claims abstract description 21
- 229920006255 plastic film Polymers 0.000 claims abstract description 21
- 239000007789 gas Substances 0.000 claims abstract description 17
- 239000007921 spray Substances 0.000 claims abstract description 11
- 239000000523 sample Substances 0.000 claims description 7
- 238000005507 spraying Methods 0.000 claims description 5
- 230000008030 elimination Effects 0.000 claims description 3
- 238000003379 elimination reaction Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 5
- 238000005086 pumping Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
- G01M3/202—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material using mass spectrometer detection systems
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
- G01M3/202—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material using mass spectrometer detection systems
- G01M3/205—Accessories or associated equipment; Pump constructions
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention discloses an online leakage detection device and method for a heat exchange tube of a condenser of a thermal power generating unit, wherein the online leakage detection device comprises a helium bottle, a vacuum pump and a gas detection device; the helium bottle is connected with a helium spray pipe, and a nozzle is arranged at the end part of the helium spray pipe; the nozzle extends into the condenser of the thermal power generating unit; the end surface of a heat exchange tube of the rear water chamber in the condenser of the thermal power unit is plugged by a second plastic film, and 1/2 end surface of the upper part of the heat exchange tube of the front water chamber is plugged by a first plastic film; the vacuum pump is connected with the steam side of a condenser of the thermal power generating unit, and the outlet of the vacuum pump is connected with the gas detection device. The method solves the problems of high cost, long construction period and high detection difficulty of unit shutdown off-line detection caused by leakage of the heat exchange tube of the condenser of the thermal power generating unit, and particularly solves the problem that the conventional detection method is lack of precision and reliability when the heat exchange tube leaks slightly.
Description
Technical Field
The invention belongs to the technical field of leakage detection of condensers of thermal power units, and particularly relates to an online leakage detection device and method for heat exchange tubes of condensers of thermal power units.
Background
Once the condenser of the thermal power unit leaks in the operation process, cooling water in the heat exchange pipe leaks to steam side condensed water, so that the conductance and the hardness of the condensed water are increased and even exceed the standard, the leakage of the condenser cooled by seawater can also cause the sodium ions of the condensed water to exceed the standard, the quality of the condensed water can be deteriorated, the quality of the whole thermodynamic system can be deteriorated in serious conditions, and hidden dangers are brought to the safe operation of the unit. In order to solve the leakage problem of the heat exchange tube of the condenser, the conventional shutdown offline treatment mode is adopted when the leakage amount is large: 1) Irrigating water and checking leakage; 2) And carrying out eddy current detection on the heat exchange tubes of the condenser one by one. When the leakage amount is smaller, the conventional non-stop online processing mode is as follows: 1) Detecting the negative pressure candle; 2) Sawdust was added to the cooling water. The integration of the above conventional detection methods has the following problems: 1) The shutdown offline detection treatment has the defects of high cost, long construction period and high detection difficulty, and the thermal power generating unit has higher cost and low economic benefit when starting and stopping once; 2) The online detection by adopting negative pressure candle observation has low accuracy and reliability, and smaller leakage points cannot be detected; 3) The online treatment mode of adding sawdust into cooling water is adopted, a certain effect is achieved for small leakage points in a short time, but the leakage points still exist after being seen for a long time, and the fundamental problem cannot be solved. Aiming at the problems, the online leakage detection device and method for the heat exchange tube of the condenser of the thermal power unit can effectively solve the problems of high cost, long construction period and high detection difficulty of the conventional leakage detection method, avoid the problem that the conventional detection method lacks precision and reliability when the heat exchange tube leaks slightly, solve the accident that the quality of condensed water deteriorates due to the leakage of the condenser, and ensure the safe operation of the unit.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide an online leakage detection device and method for a heat exchange tube of a condenser of a thermal power unit, and the online leakage detection device and method avoid the problem that a conventional detection method is lack of precision and reliability when the heat exchange tube leaks slightly.
In order to achieve the purpose, the invention adopts the following technical scheme:
an online leakage detection device for a heat exchange tube of a condenser of a thermal power generating unit comprises a helium bottle, a vacuum pump and a gas detection device;
the helium tank is connected with a helium spray pipe, and a nozzle is arranged at the end part of the helium spray pipe; the nozzle extends into the condenser of the thermal power generating unit;
the end surface of a heat exchange tube of the rear water chamber in the condenser of the thermal power unit is plugged by a second plastic film, and 1/2 end surface of the upper part of the heat exchange tube of the front water chamber is plugged by a first plastic film;
the vacuum pump is connected with the steam side of a condenser of the thermal power generating unit, and the vacuum pump outlet of the vacuum pump is connected with the gas detection device.
As a further improvement of the invention, a pressure reducing valve is arranged on the helium spray pipe.
As a further development of the invention, the nozzle projects into the front manhole.
As a further improvement of the invention, the gas detection device comprises an inhalation probe, an inhalation tube, an inhaler and a helium mass spectrometer which are connected in sequence.
As a further improvement of the invention, the first plastic film blocks the area outside the steam side of the condenser of the thermal power generating unit.
A detection method of an online leakage detection device for a heat exchange tube of a condenser of a thermal power unit comprises the following steps:
helium is sprayed into the front water chamber through the nozzle, the vacuum pump is maintained to pump negative pressure to the steam side for operation, and the helium enters the steam side through the leaked heat exchange tube;
the gas detection device detects the outlet of the vacuum pump.
As a further improvement of the invention, a helium mass spectrometer is adopted for detecting the leakage amount;
when the detection data of the helium mass spectrometer is larger than the set alarm value, an automatic alarm is given, and the leakage is large.
As a further improvement of the invention, a first plastic film is adopted to perform regional plugging detection and elimination on the front water chamber according to 1/4, 1/8 and 1/16 … …, the region sprayed with helium is gradually reduced, and finally, the heat exchange tube with leakage is found out and marked; and (4) spraying helium gas to the heat exchange tube in the upper area of the front water chamber for detection in the same way, and plugging, detecting and removing by areas to finally determine and mark the leaked heat exchange tube.
Compared with the prior art, the invention has the following advantages:
the device adopts special end cap to carry out the shutoff to the heat exchange tube both ends that leak and handle to eliminate the heat exchange tube and leak the pollution problem to condensate water quality, handle the back of accomplishing, resume normal operating to withdrawing from the side condenser, guarantee the continuous steady operation of unit. The method is high in precision, reliable and easy to realize, solves the problems of high cost, long construction period and high detection difficulty of the conventional leakage detection method, and solves the problem that the conventional detection method is lack of precision and reliability when the heat exchange tube leaks slightly. The online detection has high economy, short period and easy realization; the detection precision and reliability are high; the detection treatment takes effect quickly.
Drawings
Fig. 1 is a schematic diagram of an online leakage detection device and method for a heat exchange tube of a condenser of a thermal power unit.
In the figure: 1-helium tank; 2-a pressure reducing valve; 3-helium gas spray pipe; 4, a nozzle; 5, a front water chamber; 6-front manhole; 7-rear water chamber; 8-rear manhole; 9-a first plastic film; 10-a second plastic film; 11-heat exchange tube; 12-vapor side; 13-vacuum pump; 14-a vacuum-pumping pipeline; 15-vacuum pump outlet; 16-an inhalation probe; 17-a suction tube; 18-an inhaler; 19-helium mass spectrometer.
Detailed Description
The technical solution in the embodiments of the present invention is clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides an online leak detection device for a heat exchange tube of a condenser of a thermal power generating unit, which comprises a helium bottle 1, a vacuum pump 13 and a gas detection device;
the helium bottle 1 is connected with a helium spray pipe 3, and a nozzle 4 is arranged at the end part of the helium spray pipe 3; the nozzle 4 extends into the condenser of the thermal power generating unit;
the end face of a heat exchange tube 11 of a rear water chamber 7 in a condenser of a thermal power generating unit is plugged by a second plastic film 10, and 1/2 end face of the upper part of the heat exchange tube 11 of a front water chamber 5 is plugged by a first plastic film 9;
the vacuum pump 13 is connected with the steam side 12 of the condenser of the thermal power generating unit, and the outlet 15 of the vacuum pump 13 is connected with the gas detection device.
The gas detection device comprises an inhalation probe 16, an inhalation tube 17, an inhaler 18 and a helium mass spectrometer 19 which are connected in sequence.
In a specific embodiment, the online leak detection device comprises a helium bottle 1, a pressure reducing valve 2, a helium nozzle 3, a nozzle 4, a first plastic film 9, a second plastic film 10, an inhalation probe 16, an inhalation pipe 17, an inhaler 18 and a helium mass spectrometer 19.
The helium enters from a rear manhole 8, the end face of a heat exchange tube 11 of a rear water chamber 7 is blocked by a second plastic film 10, the helium enters from a front manhole 6, the 1/2 end face of the upper part of the heat exchange tube 11 of a front water chamber 5 is blocked by a first plastic film 9, the helium is sprayed into the front water chamber 5 through a nozzle 4, a vacuum pump 13 is maintained to pump a steam side 12 to run at negative pressure, the helium enters the steam side 12 through the leaked heat exchange tube 11 and sequentially enters a vacuum pump outlet 15 through the vacuum pump 13 and a vacuum pumping pipeline 14, and the helium enters a helium mass spectrometer 19 through an suction tube 17 and a suction device 18 sequentially after being sucked by a suction probe 16 to be subjected to leakage detection.
When the detection data of the helium mass spectrometer 19 is larger than the set alarm value, an automatic alarm is given, and the leakage amount is large.
The invention also provides a using method of the on-line leakage detecting device for the heat exchange tube of the condenser of the thermal power unit, which comprises the following steps:
after the heat exchange tube 11 of the condenser leaks, the condenser is in load reduction operation, the condenser which is suspected to leak is stopped to operate, the circulating water in the front water chamber 5 and the circulating water in the rear water chamber 7 are respectively discharged completely, and the valves of the circulating water system are confirmed to be tightly isolated; opening a rear manhole 8 and entering, plugging the end surface of a heat exchange tube 11 of a rear water chamber 7 by adopting a second plastic film 10, opening a front manhole 6 and entering, and plugging the end surface of 1/2 of the upper part of the heat exchange tube 11 of a front water chamber 5 by adopting a first plastic film 9; opening the pressure reducing valve 2, spraying a proper amount of helium to the 1/2 end face of the lower part of the front water chamber 5 through the nozzle 4, maintaining the vacuum pump 13 to pump the steam side 12 to operate at negative pressure, pumping the helium into the steam side 12 through the leaked heat exchange pipe 11, pumping the helium into the vacuum pump outlet 15 through the vacuum pump 13, sucking the helium by the suction probe 16, and then sequentially entering the helium mass spectrometer 19 through the suction pipe 17 and the suction device 18 to detect the leakage amount.
When a helium signal is detected, a panel of the helium mass spectrometer 19 displays data indicating leakage amount, when the detection data exceeds a set alarm value, the helium mass spectrometer 19 automatically alarms to judge that the heat exchange tube 11 in a helium spraying area has a leakage condition, a first plastic film 9 is adopted to perform regional plugging detection and elimination on the front water chamber 5 according to 1/4, 1/8 and 1/16 … …, the area of the helium spraying is gradually reduced, and finally the heat exchange tube 11 with the leakage is locked and found out and marked; helium is sprayed on the heat exchange tube 11 in the upper area of the front water chamber 5 to detect in the same way, and the leaked heat exchange tube 11 is finally determined and marked by adopting sub-area plugging detection and removal.
After detection is finished, the two ends of the heat exchange tube 11 which is marked to leak are plugged by the special plugging heads so as to eliminate the pollution problem of the leakage of the heat exchange tube on the quality of the condensed water, and after the detection is finished, the condenser at the exit side is restored to normal operation so as to ensure the continuous and stable operation of the unit.
Before detection, the gas detection molecular weight of the helium mass spectrometer 19 was adjusted to 4, and zero point correction was performed, and the zero point data corrected in the air was generally less than 1.0 × 10 -8 mbar.l/s, can carry out alarm value and set up, when the leakage quantity detected data surpassed alarm value, helium mass spectrometer 19 automatic alarm, it is sensitive to detect.
The online leak detection method can be carried out under the working condition that the unit is not stopped and operates with reduced load, has great advantages compared with the conventional offline detection method, solves the problems of high cost, long construction period and great detection difficulty caused by the adoption of the conventional unit for stopping and offline detection, and particularly avoids the problem of lack of precision and reliability of the conventional detection method when the heat exchange tube leaks slightly.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (9)
1. The utility model provides an online leak hunting device of thermal power unit condenser heat exchange tube which characterized in that: comprises a helium bottle (1), a vacuum pump (13) and a gas detection device;
the helium bottle (1) is connected with a helium spray pipe (3), and a nozzle (4) is arranged at the end part of the helium spray pipe (3); the nozzle (4) extends into the condenser of the thermal power generating unit;
the end face of a heat exchange tube (11) of a rear water chamber (7) in a condenser of a thermal power unit is plugged by a second plastic film (10), and the end face of the upper part of the heat exchange tube (11) of a front water chamber (5) is plugged by a first plastic film (9);
the steam side (12) of the condenser of the thermal power generating unit is connected with the vacuum pump (13), and a vacuum pump outlet (15) of the vacuum pump (13) is connected with the gas detection device.
2. The online leakage detection device for the heat exchange tube of the condenser of the thermal power generating unit as claimed in claim 1, characterized in that:
and a pressure reducing valve (2) is arranged on the helium spray pipe (3).
3. The online leakage detection device for the heat exchange tube of the condenser of the thermal power generating unit as claimed in claim 1, characterized in that:
the nozzle (4) extends into the front manhole (6).
4. The online leakage detection device for the heat exchange tube of the condenser of the thermal power generating unit as claimed in claim 1, characterized in that:
the gas detection device comprises an inhalation probe (16), an inhalation tube (17), an inhaler (18) and a helium mass spectrometer (19) which are connected in sequence.
5. The online leakage detection device for the heat exchange tube of the condenser of the thermal power generating unit as claimed in claim 1, characterized in that:
the first plastic film (9) blocks a 1/2 area outside the steam side (12) of the condenser of the thermal power generating unit.
6. The detection method for the online leakage detection device for the heat exchange tube of the condenser of the thermal power generating unit as claimed in claim 1, characterized by comprising the following steps:
helium is sprayed into the front water chamber (5) through the nozzle (4), a vacuum pump (13) is maintained to pump the steam side (12) to operate at negative pressure, and the helium enters the steam side (12) through the leaked heat exchange pipe (11);
the gas detection device detects a vacuum pump outlet (15) of a vacuum pump (13).
7. The detection method according to claim 6,
detecting the leakage amount by using a helium mass spectrometer (19);
when the detection data of the helium mass spectrometer (19) is larger than a set alarm value, an automatic alarm is given, and the leakage is large.
8. The detection method according to claim 6,
a first plastic film (9) is adopted to detect and remove the front water chamber (5) according to regional plugging, the helium spraying region is gradually reduced, and finally the heat exchange tube (11) with leakage is found out in a locked mode and marked; helium is sprayed on the heat exchange tube (11) in the upper area of the front water chamber (5) for detection in the same way, and the leaked heat exchange tube (11) is finally determined and marked by adopting sub-area plugging detection and elimination.
9. The detection method according to claim 8,
the area sprayed with the helium gas is gradually reduced according to the methods of 1/4, 1/8 and 1/16 … ….
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211064253.6A CN115420435A (en) | 2022-08-31 | 2022-08-31 | Online leakage detection device and method for heat exchange tube of condenser of thermal power unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211064253.6A CN115420435A (en) | 2022-08-31 | 2022-08-31 | Online leakage detection device and method for heat exchange tube of condenser of thermal power unit |
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| CN115420435A true CN115420435A (en) | 2022-12-02 |
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| CN202211064253.6A Pending CN115420435A (en) | 2022-08-31 | 2022-08-31 | Online leakage detection device and method for heat exchange tube of condenser of thermal power unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116558730A (en) * | 2023-07-10 | 2023-08-08 | 华能淮阴第二发电有限公司 | Portable unit vacuum system leak hunting device |
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