CN111829729A - Method for detecting leak point by expansion air-saving tightness of gas turbine exhaust pipeline - Google Patents
Method for detecting leak point by expansion air-saving tightness of gas turbine exhaust pipeline Download PDFInfo
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- CN111829729A CN111829729A CN202010601362.1A CN202010601362A CN111829729A CN 111829729 A CN111829729 A CN 111829729A CN 202010601362 A CN202010601362 A CN 202010601362A CN 111829729 A CN111829729 A CN 111829729A
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- China
- Prior art keywords
- gas turbine
- helium
- expansion joint
- tightness
- expansion
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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
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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
- G01M3/22—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 for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
- G01M3/223—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 for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for pipe joints or seals
Abstract
The invention relates to a method for detecting a leak point of an expansion throttle tightness of an exhaust pipeline of a gas turbine. The method helps operators to solve the problem of positioning the expansion joint leakage point, improves the maintenance work efficiency, shortens the maintenance period (the method can be only used when the gas-steam combined cycle unit is stopped for maintenance), avoids high-temperature flue gas leakage caused by poor expansion gas-saving tightness, and provides technical support for the maintenance work during the safe operation and overhaul of the gas-steam combined cycle unit.
Description
Technical Field
The invention belongs to the field of thermal power generation safety, relates to a gas turbine, and particularly relates to a method for detecting a leak point of an expansion throttle tightness of an exhaust pipeline of the gas turbine.
Background
The expansion joint reasonably compensates the thermal expansion of the exhaust pipeline of the gas turbine, and avoids the pipeline thermal expansion from generating extra thrust to the gas turbine, thereby avoiding the unallowable vibration generated by the central change of a shafting of the gas turbine. The expansion joint of the gas turbine has high requirements on air tightness, and the expansion joint with good air tightness can prevent high-temperature hot flue gas generated after gas combustion does work from leaking into a gas turbine housing, so that adverse effects on the running environment and safety of a unit caused by the rise of the internal temperature of the gas turbine housing are avoided.
When the expansion and the air tightness of an exhaust pipeline of the gas turbine are poor to cause high-temperature flue gas leakage, a temperature sensor in a housing of the gas turbine monitors the environment overtemperature (50 ℃) and gives an alarm. In the case of the situation, no method is provided for positioning the expansion air-saving part of the gas turbine, so that the necessary technical support is lacked for the safe operation of the gas-steam combined cycle unit and the overhaul work during the overhaul.
CN107884136A discloses a failure test device for an expansion joint, which comprises a left pipeline, a right pipeline, a left pipeline flange connected with the left pipeline, a right pipeline flange connected with the right pipeline, and an expansion joint connected between the left pipeline flange and the right pipeline flange through bolts and gaskets, wherein the non-connecting ends of the left pipeline and the right pipeline are both closed and form a sealed cavity inside, and a heating mechanism is arranged inside the sealed cavity; the high-pressure gas storage tank is arranged outside the sealing cavity, is sequentially connected with the balance valve and the flowmeter through a pipeline and is finally communicated with the sealing cavity, and the testing device further comprises a sensor for measuring the temperature and the pressure in the sealing cavity; the expansion joint comprises an expansion joint body and connecting flanges installed at two ends of the expansion joint, linear displacement sensors used for measuring the elongation of bolts are connected to bolts between a left flange of the expansion joint and a left flange of a pipeline and bolts between a right flange of the expansion joint and a right flange of the pipeline, linear displacement sensors used for measuring the compression of gaskets are connected to the gaskets, and angular displacement sensors used for measuring the rotation angle of the flanges are connected between the left flange of the expansion joint and the left flange of the pipeline and between the right flange of the expansion joint and the right flange of the pipeline in a matched mode.
The above patent is different from the detection principle of the present invention.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides the method for detecting the leak point of the expansion air-saving tightness of the exhaust pipeline of the gas turbine, improves the overhauling working efficiency and shortens the overhauling construction period.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a method for detecting leakage point of expansion throttle tightness of exhaust pipeline of gas turbine includes forming pressure difference between inside and outside of expansion joint of exhaust pipe of gas turbine by fan of cover shell, spraying helium gas in expansion joint, and detecting interface gap between expansion joint and exhaust pipe by helium mass spectrometer.
And the pressure difference is that the pressure in the gas turbine casing is 0.05-0.08MPa lower than the atmospheric pressure.
And helium is sprayed at the interface gap of the expansion joint and the gas turbine.
And the helium gas detection sensor is slowly moved at the joint of the gas turbine and the expansion joint, the sensor is connected with the helium mass spectrometer leak detector, the leak rate displayed by the helium mass spectrometer leak detector at any time is monitored, and when the leak rate reaches a set value, the sensor is stopped to move, namely, the leakage existing when the airtightness of the position is poor is determined.
Moreover, the pressure of helium sprayed from the outlet of the spray gun is 0.2-0.4 MPa.
The invention has the advantages and positive effects that:
the invention forms pressure difference inside and outside the expansion joint of the exhaust pipe of the gas turbine by the housing fan, helium is sprayed inside the expansion joint, and a helium mass spectrometer leak detector is used for detecting a gap between the expansion joint and the interface of the exhaust pipe outside the expansion joint, thereby completing the detection of the tightness leak point of the expansion joint of the exhaust pipe of the gas turbine. The method helps operators to solve the problem of positioning the expansion joint leakage point, improves the maintenance work efficiency, shortens the maintenance period (the method can be only used when the gas-steam combined cycle unit is stopped for maintenance), avoids high-temperature flue gas leakage caused by poor expansion gas tightness, and provides technical support for the safe operation of the gas-steam combined cycle unit and the maintenance work during overhaul.
Drawings
FIG. 1 is a schematic system flow diagram of a method for detecting a leak in an expansion throttle tightness of an exhaust pipe of a gas turbine according to the present invention.
FIG. 2 is a system diagram of a method for detecting a leak in an expansion throttle tightness of an exhaust pipe of a gas turbine according to the present invention.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.
A method for detecting a leak point of an expansion throttle tightness of an exhaust pipeline of a gas turbine comprises the following specific steps:
(1) during the shutdown maintenance of the gas-steam combined cycle unit, starting two housing fans 1 in a gas turbine housing for 30 minutes, and stopping operating the housing fans when the pressure in the gas turbine housing is lower than the atmospheric pressure of 0.101 MPa;
(2) a tester enters the inside of a gas turbine steam exhaust pipeline (the pipeline leads to a waste heat boiler), climbs upwards to the interface of an expansion joint 5 and a gas turbine 2, and sprays helium 4 to a gap 3 at the interface;
(3) to be inflated by heliumAfter the joint internal interface 'gap' flows into the internal of the gas turbine housing outside the expansion joint, a helium mass spectrometer leak detector 7 is started in the gas turbine housing, a helium detection sensor 6 (which is connected with the helium mass spectrometer leak detector) is slowly moved at the joint of the gas turbine and the expansion joint, the leak rate displayed by the helium mass spectrometer leak detector at any moment is strictly monitored, and when the leak rate reaches 1 multiplied by 10, the leak rate is displayed-5And when mbar.l/s, stopping moving the sensor, namely determining that the air tightness of the position is poor, leakage exists, and performing leakage repairing treatment on a leakage point.
Moreover, the starting of the gas turbine casing fan in the step (1) specifically includes:
before starting a gas turbine housing fan, checking whether the housing fan is connected with a power supply or not and whether the housing fan has a commissioning condition or not;
and secondly, the gas turbine engine shell is different from a vacuum system of a steam turbine set for leak detection, the gas turbine engine shell does not belong to the vacuum system, a vacuum pump is not used for pumping air out, and a fan of the gas turbine engine shell is started to pump the space in the gas turbine engine shell to be in a vacuum state, so that helium can conveniently flow out of an expansion joint and a gas turbine interface from a gap and into the gas turbine engine shell.
Moreover, the specific conditions and steps of helium spraying in the step (2) are as follows:
firstly, the unit must be in a shutdown state during maintenance;
secondly, connecting a self-made spray gun with an air guide pipe, the air guide pipe with a pressure reducing valve (regulating the pressure sprayed by helium), and the pressure reducing valve with a helium tank, wherein the helium tank contains helium with the pressure of about 10 MPa;
thirdly, on the basis of ensuring the safety of equipment in the gas turbine housing, in order to ensure the effect of leak point detection, helium is effectively sucked by the helium mass spectrometer leak detector, the pressure of the pressure reducing valve is adjusted to 0.4MPa, namely the pressure of the helium sprayed out of the outlet of the spray gun is 0.4 MPa.
Further, in the step (3), the initial value of the helium mass spectrometer leak detector is 1 × 10-8mbar l/s, the value will rise after helium gas is detected by the helium mass spectrometer sensor, and the value reaches 1000 times of the initial value, namely 1 × 10-5And mbar l/s, determining that the air tightness of the corresponding position of the sensor is poor, and the position has leakage.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept, and these changes and modifications are all within the scope of the present invention.
Claims (5)
1. A method for detecting a leak point of an expansion throttle tightness of an exhaust pipeline of a gas turbine is characterized by comprising the following steps: the pressure difference is formed between the inside and the outside of the expansion joint of the exhaust pipe of the gas turbine through the housing fan, helium is sprayed inside the expansion joint, and a helium mass spectrometer leak detector is used for detecting a joint gap between the expansion joint and the exhaust pipe outside the expansion joint.
2. The method of claim 1, wherein: the pressure difference is that the pressure in the gas turbine casing is 0.05-0.08MPa lower than the atmospheric pressure.
3. The method of claim 1, wherein: helium is sprayed at the interface gap of the expansion joint and the gas turbine.
4. The method of claim 1, wherein: and slowly moving a helium detection sensor at the joint of the gas turbine and the expansion joint, wherein the sensor is connected with a helium mass spectrometer leak detector, monitoring the leak rate constantly displayed by the helium mass spectrometer leak detector, and stopping moving the sensor when the leak rate reaches a set value, namely determining that the position has poor air tightness and leakage.
5. The method of claim 1, wherein: the pressure of helium sprayed from the spray gun outlet is 0.2-0.4 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010601362.1A CN111829729A (en) | 2020-06-29 | 2020-06-29 | Method for detecting leak point by expansion air-saving tightness of gas turbine exhaust pipeline |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010601362.1A CN111829729A (en) | 2020-06-29 | 2020-06-29 | Method for detecting leak point by expansion air-saving tightness of gas turbine exhaust pipeline |
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| CN111829729A true CN111829729A (en) | 2020-10-27 |
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| CN202010601362.1A Pending CN111829729A (en) | 2020-06-29 | 2020-06-29 | Method for detecting leak point by expansion air-saving tightness of gas turbine exhaust pipeline |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103389190A (en) * | 2013-07-29 | 2013-11-13 | 中国五冶集团有限公司 | Wind-pressure smoke detection and leakproofness testing method of air pipe and wind-pressure smoke detection testing system of air pipe |
| CN104374526A (en) * | 2013-08-12 | 2015-02-25 | 中核核电运行管理有限公司 | Helium leakage detecting device and method for expansion joint of condenser |
| CN107543663A (en) * | 2016-09-14 | 2018-01-05 | 北京卫星环境工程研究所 | Aerostatics Helium Leak Test |
| CN109000856A (en) * | 2018-07-28 | 2018-12-14 | 上海二十冶建设有限公司 | A kind of air seal test method being segmented leak detection, whole pressure testing |
| CN109708818A (en) * | 2019-03-19 | 2019-05-03 | 中船动力研究院有限公司 | A kind of gas machine air leakage detection system |
| CN209539612U (en) * | 2019-01-07 | 2019-10-25 | 江苏克劳特低温技术有限公司 | Low temperature draught fan performance test system |
-
2020
- 2020-06-29 CN CN202010601362.1A patent/CN111829729A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103389190A (en) * | 2013-07-29 | 2013-11-13 | 中国五冶集团有限公司 | Wind-pressure smoke detection and leakproofness testing method of air pipe and wind-pressure smoke detection testing system of air pipe |
| CN104374526A (en) * | 2013-08-12 | 2015-02-25 | 中核核电运行管理有限公司 | Helium leakage detecting device and method for expansion joint of condenser |
| CN107543663A (en) * | 2016-09-14 | 2018-01-05 | 北京卫星环境工程研究所 | Aerostatics Helium Leak Test |
| CN109000856A (en) * | 2018-07-28 | 2018-12-14 | 上海二十冶建设有限公司 | A kind of air seal test method being segmented leak detection, whole pressure testing |
| CN209539612U (en) * | 2019-01-07 | 2019-10-25 | 江苏克劳特低温技术有限公司 | Low temperature draught fan performance test system |
| CN109708818A (en) * | 2019-03-19 | 2019-05-03 | 中船动力研究院有限公司 | A kind of gas machine air leakage detection system |
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Application publication date: 20201027 |