CN114018494B - Nuclear condenser tracing leakage detection equipment test simulation system and method - Google Patents
Nuclear condenser tracing leakage detection equipment test simulation system and method Download PDFInfo
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- CN114018494B CN114018494B CN202111255602.8A CN202111255602A CN114018494B CN 114018494 B CN114018494 B CN 114018494B CN 202111255602 A CN202111255602 A CN 202111255602A CN 114018494 B CN114018494 B CN 114018494B
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- 238000001514 detection method Methods 0.000 title claims abstract description 97
- 238000012360 testing method Methods 0.000 title claims abstract description 44
- 238000004088 simulation Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000012546 transfer Methods 0.000 claims abstract description 59
- 230000000694 effects Effects 0.000 claims abstract description 17
- 239000000700 radioactive tracer Substances 0.000 claims description 111
- 238000001035 drying Methods 0.000 claims description 21
- 238000004458 analytical method Methods 0.000 claims description 17
- 238000007789 sealing Methods 0.000 claims description 16
- 239000000284 extract Substances 0.000 claims description 13
- 239000012535 impurity Substances 0.000 claims description 6
- 238000003466 welding Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 3
- 238000010998 test method Methods 0.000 claims description 3
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 256
- 238000010586 diagram Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 239000000523 sample Substances 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
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- 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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Abstract
The invention discloses a test simulation system and a test simulation method for a nuclear condenser tracing leakage detection device, wherein the system comprises a condenser cylinder, a tracing leakage detection device and a vacuum component, wherein the condenser cylinder is provided with a condenser shell side tracing gas leak, a condenser shell side gas inlet, a tube bundle side tracing gas leak, a condenser heat transfer tube bundle, a condenser tube plate and a condenser shell side gas outlet, the condenser shell side is the space outside the condenser heat transfer tube bundle and inside the condenser cylinder, the condenser shell side tracing gas leak, the condenser shell side gas inlet and the condenser shell side gas outlet are respectively connected to the outer wall of the condenser cylinder, the tube bundle side tracing gas leak is a leak arranged on one or a plurality of condenser heat transfer tube bundles, and the condenser tube plate comprises holes with the same arrangement rule as the condenser heat transfer tube bundles. The invention simulates various working conditions required during the tracing leakage detection of the condenser by the cooperation of the components, and realizes the purpose of testing the leakage detection effect of tracing leakage detection equipment.
Description
Technical Field
The invention belongs to the technical field of nondestructive testing leakage detection, and particularly relates to a test simulation system and method for a nuclear condenser tracing leakage detection device.
Background
The condenser is an important device for cooling in the thermodynamic cycle of the nuclear power plant, the condenser operates normally, a vacuum degree is established and maintained at the air outlet of the steam turbine through heat exchange with cooling water, and the exhaust steam of the steam turbine is condensed into water as two-loop water supply to form a complete cycle. The condenser has higher boundary integrity requirement and mainly comprises the tightness of components such as a heat transfer tube bundle, a flange, a cover plate and the like. The condenser has good tightness, can reduce the exhaust temperature and the exhaust pressure of the steam turbine, and improves the thermal cycle efficiency. The leak tightness failure of the condenser is expressed as condenser leakage and is mainly divided into heat transfer pipe leakage and flange leakage. The condenser leakage can cause the problems of reduced vacuum degree or increased ion concentration of cooling water, and the like, so that the safe and economic operation of the power plant is affected.
There are many leak detection methods for quickly searching for condenser leakage, among which the technology is mature and widely accepted is the trace gas leak detection method. The principle of tracing leakage detection is that the shell side of the condenser is in a vacuum state, and trace gas is applied to suspicious areas of components such as a condenser heat transfer tube bundle or a flange. If there is leakage in this area, under the action of the shell side vacuum, a portion of the trace gas will enter the shell side through the leakage location and be drawn out by the condenser vacuum system along with other non-condensing gases. And a sampling system is arranged at the outlet of the vacuum system, the probe of the tracer gas leak detector is used for measuring the mixed gas extracted in the sampling system, and the concentration of the tracer gas in the mixed gas is determined and the leakage condition is judged.
The development, test and leakage detection effect evaluation of the existing nuclear condenser tracing leakage detection equipment mainly depend on theoretical calculation or actual test in the nuclear power plant field. The operation working conditions of the condenser of the nuclear power plant cannot be correspondingly adjusted according to the test requirements, the leakage detection of the condenser of the nuclear power plant needs to be considered in terms of construction period requirements, and various functions and leakage detection effects of the developed leakage detection equipment cannot be tested systematically and reasonably. The invention provides a system for testing a nuclear condenser tracing leakage detecting device, which simulates a shell side vacuum state generated by the operation of a condenser to reasonably and fully test the leakage detecting effect of the tracing leakage detecting device.
Disclosure of Invention
Aiming at the defect that the nuclear condenser tracing leakage detecting equipment lacks a reliable and available testing system, the invention provides a system for testing the nuclear condenser tracing leakage detecting equipment, which can simulate a shell side vacuum state generated by the operation of a condenser, simulate the leakage condition of a single or a plurality of different positions and realize the aim of reasonably and fully testing the leakage detecting effect of the tracing leakage detecting equipment.
In order to achieve the above purpose, the invention adopts the following technical scheme: the utility model provides a nuclear condenser tracer leak detection equipment test analog system, it includes condenser barrel (13), tracer leak detection equipment (11), vacuum assembly (8), be equipped with condenser shell side tracer gas leak (1) on condenser barrel (13), condenser shell side gas entry (2), tube bank side tracer gas leak (3), condenser heat transfer tube bank (4), condenser tube sheet (5), condenser shell side gas export (7), condenser shell side (6) are condenser heat transfer tube bank (4) outside condenser barrel (13) inboard space, condenser shell side tracer gas leak (1), condenser shell side gas entry (2) and condenser shell side gas export (7) are connected respectively at condenser barrel (13) outer wall, tube bank side tracer gas leak (3) are the leak that sets up on a certain root or a plurality of roots in condenser heat transfer tube bank (4), contain on condenser tube sheet (5) with arrange condenser heat transfer tube (4) regular the same hole.
Optimally, a vacuum assembly air outlet (12) is arranged on the vacuum assembly (8), the vacuum assembly air outlet consists of a vacuum pump, a vacuum gauge and a controller, the interior of the condenser shell side (6) is vacuumized through the condenser shell side air outlet (7), and the vacuum degree in the condenser shell side (6) can be maintained in a specific state through the cooperation of the controller and the vacuum gauge.
Optimally, the system also comprises a filter assembly (9) and a drying assembly (10), wherein the filter assembly (9) is connected to one outlet of the vacuum assembly (8) through a sealing pipeline and is connected to the drying assembly (10) through a sealing pipeline, and the mixed gas pumped by the vacuum assembly (8) is filtered by the filter assembly (9) to remove impurities such as particles and the like and enter the drying assembly (10); the drying component (10) is connected to the tracing leakage detecting equipment (11) through a sealed pipeline, and mixed gas with filtered impurities enters the tracing leakage detecting equipment (11) after being dehumidified in the drying component (10).
Preferably, two sides of two ends of the condenser heat transfer tube bundle (4) are respectively in sealing and welding connection with the condenser tube plate (5), the inside of the condenser heat transfer tube bundle (4) and the condenser shell side (6) are respectively kept in a closed state, gas leakage exists only at the position of the trace gas leakage hole (3) on the tube bundle side, and the condenser heat transfer tube bundle (4) is inserted into a hole on the condenser tube plate (5) and then is in sealing and welding connection with the condenser tube plate (5), and the mixed gas containing the trace gas can be filled into the condenser heat transfer tube bundle (4) through the condenser tube plate (5) during testing.
Optimally, a condenser shell side gas outlet (7) is connected with a vacuum assembly (8) through a sealing pipeline, and gas in the condenser shell side (6) is pumped out by the condenser shell side gas outlet (7).
Preferably, the system comprises a pressure reducing valve flowmeter (15), a trace gas source (16) and a shell-side trace gas application device (17), wherein the shell-side trace gas application device (17) is used for conveying trace gas to a shell-side trace gas leak hole (1) of the condenser.
Preferably, the system comprises a tube-side tracer gas application device (14), a pressure reducing valve flowmeter (15) and a tracer gas source (16), wherein the tube-side tracer gas application device (14) is used for uniformly conveying the tracer gas to a specific heat transfer tube bundle on the condenser tube plate (5).
The invention also provides a method for testing the condenser flange or the cover plate based on the simulation system, which comprises the following steps:
a. recording a vacuum gauge signal of the vacuum assembly (8), recording a stable signal output by the tracing leakage detecting equipment (11) and taking the stable signal as a background signal S 0 ；
b. Obtaining an output signal of the condenser shell side trace gas leakage hole (1) in an open state and recording the signal as a reference leakage signal S 1 ；
c. Obtaining an output signal of the condenser shell side trace gas leakage hole (1) in a closed state and recording the signal as a leakage signal S 2 ；
d. Will leak signal S 2 And background signal S 0 In contrast, use formula Q 2 =Q 1 ×（S 2 -S 0 ）/（S 1 -S 0 ) And calculating and judging leakage condition of the flange or the cover plate component of the condenser.
Optimally, in step a: firstly, a condenser shell side trace gas leak hole (1), a condenser shell side gas inlet (2) and a tube bundle side trace gas leak hole (3) are set to be closed, a vacuum component (8) and trace leakage detection equipment (11) are set and started, and under the operation of the vacuum component (8), the gas in the condenser shell side (6) is pumped out and gradually forms a vacuum state, the trace leakage detection equipment (11) extracts part of the gas at the outlet of the vacuum component (8) and obtains a signal of the corresponding trace gas content, and waits for a vacuum gauge signal of the vacuum component (8) and a trace leakage detection equipment (11) to output a stable signal and record the signal as a background signal S 0 。
Optimally, in step b: setting the state of a tracer gas leakage hole (1) at the shell side of the condenser as open, and setting the nominal leakage rate Q of the tracer gas leakage hole (1) at the shell side of the condenser 1 The other parts are arranged unchanged, and the trace gas is subjected to vacuumThen, the gas enters the condenser shell side (6) through the tracer gas leak hole (1) at the condenser shell side and is pumped to the outlet of the vacuum component (8), part of the gas is extracted by the tracer leak detection equipment (11) for analysis, an output signal is obtained, and the signal is recorded as a reference leak signal S 1 。
Optimally, in step c: setting the state of a tracer gas leak hole (1) at the shell side of the condenser to be closed, applying tracer gas to a flange or a cover plate part of the condenser, extracting part of gas by a tracer leak detection device (11) for analysis, obtaining an output signal and recording the signal as a leak signal S 2 。
Optimally, in step d: will leak signal S 2 And background signal S 0 In contrast, use formula Q 2 =Q 1 ×（S 2 -S 0 ）/（S 1 -S 0 ) And calculating and judging leakage condition of the flange or the cover plate component of the condenser.
The invention also provides a method for testing the condenser heat transfer tube based on the simulation system, which comprises the following steps:
f. closing a shell side trace gas leakage hole (1) of the condenser, and waiting for a leakage signal output by trace leakage detection equipment (11) to be reduced to a background signal S 0 ；
g. The tube bundle side trace gas leak hole (3) is set to be opened, an output signal is obtained and the signal is recorded as a reference leak signal S 3 ；
h. The tube bundle side trace gas leak (3) is set to be closed, an output signal is obtained and the signal is recorded as a leak signal S 4 ；
i. Will leak signal S 4 And background signal S 0 In contrast, use formula Q 4 =Q 3 ×（S 4 -S 0 ）/（S 3 -S 0 ) And calculating and judging the leakage condition of the heat transfer tube of the condenser.
Optimally, in step g: setting the tube bundle side trace gas leakage hole (3) to be opened, and nominal leakage rate Q of the tube bundle side trace gas leakage hole (3) 3 The other parts are arranged unchanged, and the tracer gas passes through the tracer gas leakage holes on the tube bundle side under the vacuum effect(3) Enters the condenser shell side (6) and is pumped to the outlet of the vacuum component (8), the trace leakage detection equipment (11) extracts part of gas for analysis, obtains an output signal and records the signal as a reference leakage signal S 3 。
Optimally, in the step h: the tracer gas leakage holes (3) on the tube bundle side are set to be closed, mixed gas containing tracer gas is released into the condenser heat transfer tube bundle (4) at the condenser tube plate (5), part of gas is extracted by the tracer leak detection equipment (11) for analysis, an output signal is obtained, and the signal is recorded as a leakage signal S 4 。
Optimally, in step i: will leak signal S 4 And background signal S 0 In contrast, use formula Q 4 =Q 3 ×（S 4 -S 0 ）/（S 3 -S 0 ) And calculating and judging the leakage condition of the heat transfer tube of the condenser.
According to the invention, through the cooperation of the components, various working conditions required during the tracing leakage detection of the condenser are simulated, and the purpose of testing the leakage detection effect of tracing leakage detection equipment is realized; the types or the sizes of the leak holes are changed at the positions of the trace gas leak holes on the shell side and the trace gas leak holes on the tube bundle side of the condenser, and the parts such as the flange, the cover plate and the like of the condenser can simulate the leak of different sizes and test the trace leakage detection equipment; the tracer gas type is replaced at the tracer gas leak holes on the shell side and the tracer gas leak holes on the tube bundle side of the condenser, the tracer leak detection equipment type is replaced, and other tracer gases can also adopt the test simulation system of the nuclear condenser tracer leak detection equipment.
Drawings
FIG. 1 is a schematic diagram of a test simulation system for a nuclear condenser trace leak detection apparatus;
FIG. 2 is a schematic diagram of a shell side tracing leak detection method of a nuclear condenser simulation system;
fig. 3 is a schematic diagram of a tube side tracing leakage detection method of a nuclear condenser simulation system.
Detailed Description
The invention will be described in further detail with reference to the drawings and the detailed description.
As shown in fig. 1, the test simulation system of the nuclear condenser tracing leakage detection equipment comprises a condenser shell side tracing gas leakage hole 1, a condenser shell side gas inlet 2, a tube bundle side tracing gas leakage hole 3, a condenser heat transfer tube bundle 4, a condenser tube plate 5, a condenser shell side 6, a condenser shell side gas outlet 7, a vacuum component 8, a filtering component 9, a drying component 10, a tracing leakage detection equipment 11, a vacuum component air outlet 12 and a condenser cylinder 13.
The tracer gas leak hole 1 on the shell side of the condenser is connected to the outer wall of the condenser cylinder 13, mixed gas containing the tracer gas can be leaked into the shell side 6 of the condenser according to constant flow, and the leak hole can be replaced in different types and flow. The tracer gas leak 1 on the shell side of the condenser can also be used for simulating the leakage conditions of the connecting components such as the flange, the cover plate and the like on the shell side of the nuclear condenser in different orders of magnitude.
The condenser shell side gas inlet 2 is connected to the outer wall of the condenser cylinder 13, and the flow of air or steam entering the condenser shell side 6 can be changed through a control valve.
The tube bundle side tracer gas leak holes 3 are leak holes arranged on one or a plurality of tube bundles 4 of the condenser heat transfer tube, if tracer gas exists in the tube bundles 4 of the condenser heat transfer tube, the tracer gas can leak into the shell side 6 of the condenser according to constant flow through the tube bundle side tracer gas leak holes 3, and the leak holes can be replaced with different types and flow. The tube bundle side trace gas leak (3) can also be used for simulating leakage conditions of different orders of magnitude of the condenser heat transfer tube bundles (4).
The condenser heat transfer tube bundle 4 comprises a plurality of parallel heat transfer tubes which are arranged inside the condenser cylinder 13 in a specific regular manner, two sides of the condenser heat transfer tube bundle 4 are respectively in sealing and welding connection with the condenser tube plate 5, the inside of the condenser heat transfer tube bundle 4 and the condenser shell side 6 are respectively kept in a closed state, and gas leakage only exists at the trace gas leakage holes 3 on the tube bundle side.
The condenser tube plate 5 comprises holes which are the same as the arrangement rule of the condenser heat transfer tube bundles 4, the condenser heat transfer tube bundles 4 are inserted into the holes and then are connected with the condenser tube plate 5 in a sealing and welding mode, and the mixed gas containing the tracer gas can be filled into the condenser heat transfer tube bundles 4 through the condenser tube plate 5 during testing.
The condenser shell side 6 is pumped by the vacuum component 8 during the test to form a certain degree of vacuum, for example, the condenser shell side trace gas leakage holes 1 or the tube bundle side trace gas leakage holes 3 are provided with mixed gas containing trace gas, and the mixed gas can enter the condenser shell side 6 under the action of the vacuum.
The condenser shell side gas outlet 7 is connected to the outer wall of the condenser cylinder 13 and connected with the vacuum component 8 through a sealing pipeline, and the gas in the condenser shell side 6 is pumped out by the condenser shell side gas outlet 7.
The vacuum assembly 8 consists of a vacuum pump, a vacuum gauge and a controller, and can be used for vacuumizing the condenser shell side 6 through the condenser shell side gas outlet 7 and maintaining the vacuum degree in the condenser shell side 6 in a specific state through the cooperation of the controller and the vacuum gauge.
The filter assembly 9 is connected to an outlet of the vacuum assembly 8 through a sealed pipe, and is connected to the drying assembly 10 through a sealed pipe, and the mixed gas pumped out of the vacuum assembly 8 is filtered by the filter assembly 9 to remove impurities such as particles and the like into the drying assembly 10.
The drying component 10 is connected to the tracing leakage detecting equipment 11 through a sealed pipeline, and mixed gas for filtering out impurities enters the tracing leakage detecting equipment 11 after being dehumidified in the drying component 10, so that the influence of water vapor on the tracing leakage detecting equipment 11 is reduced.
The tracer leak detection equipment 11 pumps the mixed gas to the tracer leak detection equipment 11 from an outlet of the vacuum component 8 through a vacuum system in the equipment, analyzes the content of the tracer gas in the extracted gas, compares the measurement result with a background signal, and judges the leakage condition after analysis and calculation.
The vacuum assembly air outlet 12 discharges a large amount of mixed gas extracted by the vacuum assembly 8 after safe disposal.
The condenser cylinder 13 contains condenser heat transfer tube bundles 4, condenser tube plates 5 and condenser shell sides 6, and an opening is reserved on the outer wall of the condenser cylinder 13 and is connected with the condenser shell side tracer gas leakage holes 1, the condenser shell side gas inlets 2 and the condenser shell side gas outlets 7.
Example 1
When the system comprises a condenser shell side trace gas leak hole 1, a condenser shell side gas inlet 2, a tube bundle side trace gas leak hole 3, a condenser heat transfer tube bundle 4, a condenser tube plate 5, a condenser shell side 6, a condenser shell side gas outlet 7, a vacuum component 8, a filter component 9, a drying component 10, a trace leakage detection device 11, a vacuum component air outlet 12 and a condenser barrel 13.
The method for testing the condenser flange or the cover plate based on the simulation system comprises the following steps:
a. setting a condenser shell side trace gas leak, a condenser shell side gas inlet and a tube bundle side trace gas leak to be closed, and setting and starting a vacuum assembly and trace leakage detection equipment;
b. under the operation of the vacuum component, the internal gas at the shell side of the condenser is pumped out and gradually forms a vacuum state, the trace leakage detection equipment extracts part of the gas at the outlet of the vacuum component, and obtains a signal of the corresponding trace gas content, waits for the stability of the vacuum meter signal of the vacuum component and the output signal of the trace leakage detection equipment and records the signal as a background signal S 0 ；
c. Setting the state of the tracer gas leak hole at the shell side of the condenser to be opened, and setting the nominal leak rate Q of the tracer gas leak hole at the shell side of the condenser 1 The arrangement of other parts is unchanged, trace gas enters the condenser shell side through a trace gas leak hole at the condenser shell side under the vacuum effect and is pumped to an outlet of a vacuum component, and trace leakage detection equipment extracts part of gas for analysis, obtains an output signal and records the signal as a reference leakage signal S 1 ；
d. Setting the state of a tracer gas leakage hole at the shell side of the condenser to be closed, applying tracer gas to components such as a flange or a cover plate of the condenser, extracting part of gas by a tracer leak detection device for analysis, obtaining an output signal and recording the signal as a leakage signal S 2 ；
e. Will leak signal S 2 And background signal S 0 In contrast, use formula Q 2 =Q 1 ×（S 2 -S 0 ）/（S 1 -S 0 ) Calculating and judging leakage condition of flange or cover plate part of condenser, when Q 2 Above a certain threshold MThe leakage of the components such as the condenser flange or the cover plate is determined (the value of M is different according to the actual situation of the purchasing party, and is not particularly limited here).
Example two
When the system comprises a condenser shell side trace gas leak hole 1, a condenser shell side gas inlet 2, a tube bundle side trace gas leak hole 3, a condenser heat transfer tube bundle 4, a condenser tube plate 5, a condenser shell side 6, a condenser shell side gas outlet 7, a vacuum component 8, a filter component 9, a drying component 10, a trace leakage detection device 11, a vacuum component air outlet 12 and a condenser barrel 13.
The method for testing the condenser heat transfer tube based on the simulation system comprises the following steps:
f. closing a tracer gas leak hole at the shell side of the condenser, and waiting for a leakage signal output by the tracer leak detection equipment to gradually decrease to a background signal S 0 ；
g. Setting the tube bundle side trace gas leak to be open, the tube bundle side trace gas leak has a nominal leak rate Q 3 The arrangement of other parts is unchanged, trace gas enters the condenser shell side through a tube bundle side trace gas leak hole under the vacuum effect and is pumped to a vacuum assembly outlet, trace leakage detection equipment extracts part of gas for analysis, obtains an output signal and records the signal as a reference leakage signal S 3 ；
h. The tracer gas leakage holes on the tube bundle side are set to be closed, mixed gas containing tracer gas is released into the tube bundle of the condenser heat transfer tube at the tube plate of the condenser, part of gas is extracted by the tracer leak detection equipment for analysis, an output signal is obtained, and the signal is recorded as a leakage signal S 4 ；
i. Will leak signal S 4 And background signal S 0 In contrast, use formula Q 4 =Q 3 ×（S 4 -S 0 ）/（S 3 -S 0 ) Calculating and judging leakage condition of condenser heat transfer tube, when Q 4 If the value is greater than a certain threshold value N, it is determined that the components such as the condenser flange or the cover plate leak (the value of N is different according to the actual situation of the purchasing party, and is not particularly limited here).
The types or the sizes of the leak holes are changed at the positions of the trace gas leak holes on the shell side and the trace gas leak holes on the tube bundle side of the condenser, and the parts such as the flange, the cover plate and the like of the condenser can simulate the leak of different sizes and test the trace leakage detection equipment; the tracer gas type is replaced at the tracer gas leak holes on the shell side and the tracer gas leak holes on the tube bundle side of the condenser, the tracer leak detection equipment type is replaced, and other tracer gases can also adopt the test simulation system of the nuclear condenser tracer leak detection equipment.
Example III
When the system comprises a condenser shell side trace gas leak 1, a condenser shell side gas inlet 2, a tube bundle side trace gas leak 3, a condenser heat transfer tube bundle 4, a condenser tube sheet 5, a condenser shell side 6, a condenser shell side gas outlet 7, a vacuum component 8, a filter component 9, a drying component 10, a trace leakage detection device 11, a vacuum component gas outlet 12, a condenser cylinder 13, a pressure reducing valve flowmeter 15, a trace gas source 16 and a shell side trace gas applying device 17; the pressure reducing valve flowmeter 15 is used for adjusting the pressure and flow of the trace gas provided by the trace gas source 16 to expected values, and can be used for testing and comparing trace leakage detection effects of different trace gas concentrations and pressures in a simulation system; a trace gas source 16 provides a trace gas for analog system leak detection, which may typically be provided by a gas cylinder; the shell-side tracer gas applying device 17 is used for conveying tracer gas to the shell-side tracer gas leak holes 1 of the condenser, and is usually formed by spray guns with different sizes, the application action of the tracer gas can be conveniently controlled through a switch, the consumption of the tracer gas applied to the shell-side tracer gas leak holes 1 is controlled through a pressure reducing valve flowmeter 15 connected with the rear end, and different tracer gas consumption is applied to leakage leak points of connecting components such as a shell-side flange and a cover plate of the nuclear condenser in a simulation mode.
The method for tracing leakage detection equipment and tracing leakage detection test under the condition that components such as a condenser flange, a cover plate and the like are simulated based on the simulation system comprises the following steps:
A. the components are connected schematically according to FIG. 2, and the condenser shell side trace gas leakage hole 1, the condenser shell side gas inlet 2 and the tube bundle side trace gas leakage hole 3 are closed;
B. setting a condenser shell side gas outlet 7 to be opened, starting a vacuum assembly 8, and starting a tracing leakage detection device 11;
C. under the operation of the vacuum component 8, the gas in the condenser shell side 6 is pumped out and gradually forms a vacuum state, and the vacuum component 8 is regulated to maintain the vacuum state in the condenser shell side 6;
D. the trace leakage detection equipment 11 extracts part of gas at the outlet of the vacuum component 8 to obtain a signal of the corresponding trace gas content, waits for the vacuum meter signal of the vacuum component 8 and the trace leakage detection equipment 11 to output a stable signal and records the signal as a background signal S0;
E. opening a condenser shell side trace gas leak hole 1, and recording the nominal leak rate Q1 of the condenser shell side trace gas leak hole 1;
F. after the condenser shell side tracer gas leak 1 is opened, other parts are kept unchanged, under the action of vacuum, tracer gas enters the condenser shell side 6 through the condenser shell side tracer gas leak 1 and is pumped to the outlet of the vacuum component 8, part of gas is extracted by the tracer leak detection equipment 11 for analysis, an output signal is obtained, and the signal is recorded as a reference leak signal S1;
G. closing a shell-side tracer gas leak hole 1 of the condenser, and applying tracer gas on components such as a flange, a cover plate and the like of the condenser by utilizing a shell-side tracer gas applying device 17 after the output signal of the tracer leak detection equipment 11 is stable;
H. the front end of the shell-side tracer gas applying device 17 should be as close to the detected part as possible, and the tail end should be adjusted to the expected value of the tracer gas pressure and flow by using the pressure reducing valve flowmeter 15;
I. the tracing leakage detecting device 11 extracts part of the gas for analysis, obtains an output signal and records the signal as a leakage signal S2;
J. comparing the leakage signal S2 with the background signal S0, the leakage condition is calculated and judged by using the formula q2=q1× (S2-S0)/(S1-S0).
Example IV
When the system comprises a condenser shell side trace gas leak 1, a condenser shell side gas inlet 2, a tube bundle side trace gas leak 3, a condenser heat transfer tube bundle 4, a condenser tube sheet 5, a condenser shell side 6, a condenser shell side gas outlet 7, a vacuum component 8, a filter component 9, a drying component 10, a trace leakage detection device 11, a vacuum component gas outlet 12, a condenser cylinder 13, a tube side trace gas application device 14, a pressure reducing valve flowmeter 15 and a trace gas source 16; the tube-side tracer gas applying device 14 is used for uniformly conveying the tracer gas to a specific heat transfer tube bundle on the condenser tube plate 5, is generally formed by sealing covers with different sizes, can be tightly attached to the condenser tube plate 5, and controls the dosage of the tracer gas applied to the heat transfer tube bundle by a pressure reducing valve flowmeter 15 connected with the rear end; the pressure reducing valve flowmeter 15 is used for adjusting the pressure and flow of the trace gas provided by the trace gas source 16 to expected values, and can be used for testing and comparing trace leakage detection effects of different trace gas concentrations and pressures in a simulation system; a trace gas source 16 provides a trace gas for analog system leak detection, which may typically be provided by a gas cylinder.
The system is used for simulating the tracing leakage detection equipment and the tracing leakage detection test method under the condition that the condenser heat transfer pipe generates leakage, and the system comprises the following steps:
K. the components are connected schematically according to FIG. 3, and the condenser shell side trace gas leakage hole 1, the condenser shell side gas inlet 2 and the tube bundle side trace gas leakage hole 3 are closed;
setting a condenser shell side gas outlet 7 to be opened, starting a vacuum assembly 8, and starting tracing leakage detection equipment 11;
m, under the work of the vacuum component 8, the gas in the condenser shell side 6 is pumped out and gradually forms a vacuum state, and the vacuum component 8 is regulated to maintain the vacuum state in the condenser shell side 6;
n, the trace leakage detection equipment 11 extracts part of gas at the outlet of the vacuum component 8 to obtain a signal of the corresponding trace gas content, waits for the stability of the vacuum meter signal of the vacuum component 8 and the output signal of the trace leakage detection equipment 11 and records the signal as a background signal S0;
opening a tube bundle side tracer gas leak hole 3, and recording the nominal leak rate Q3 of the tube bundle side tracer gas leak hole 3;
p, after the tracer gas leakage holes 3 on the side of the condenser tube bundle are opened, the arrangement of other parts is kept unchanged, and the tracer gas enters the condenser shell side 6 through the tracer gas leakage holes 3 on the side of the condenser tube bundle under the action of vacuum and is pumped to the outlet of the vacuum component 8, and the tracer leak detection equipment 11 extracts part of gas for analysis, obtains an output signal and records the signal as a reference leak signal S3;
q, closing the tube bundle side trace gas leakage holes 3, and applying trace gas to the condenser heat transfer tube bundles 4 by utilizing a tube side trace gas applying device 14 at the condenser tube plate 5 after the trace leakage detecting equipment 11 outputs stable signals;
the front end of the tube-side tracer gas applying device 14 is pressed on the condenser tube plate 5 by applying force to tightly fit, and the tail end of the tube-side tracer gas applying device is used for adjusting the pressure and flow of the tracer gas to expected values by using the pressure reducing valve flowmeter 15;
s, the trace leakage detection equipment (11) extracts part of gas for analysis, obtains an output signal and records the signal as a leakage signal S4;
comparing the leakage signal S4 with the background signal S0, and calculating and judging the leakage condition by using the formula Q4=Q3× (S4-S0)/(S3-S0).
Example five
When the system comprises a condenser shell side trace gas leak 1, a condenser shell side gas inlet 2, a tube bundle side trace gas leak 3, a condenser heat transfer tube bundle 4, a condenser tube sheet 5, a condenser shell side 6, a condenser shell side gas outlet 7, a vacuum component 8, a filter component 9, a drying component 10, a trace leakage detection device 11, a vacuum component gas outlet 12, a condenser cylinder 13, a pressure reducing valve flowmeter 15, a trace gas source 16 and a shell side trace gas applying device 17; the pressure reducing valve flowmeter 15 is used for adjusting the pressure and flow of the trace gas provided by the trace gas source 16 to expected values, and can be used for testing and comparing trace leakage detection effects of different trace gas concentrations and pressures in a simulation system; a trace gas source 16 provides a trace gas for analog system leak detection, which may typically be provided by a gas cylinder; the shell-side tracer gas applying device 17 is used for conveying tracer gas to the shell-side tracer gas leak holes 1 of the condenser, and is usually formed by spray guns with different sizes, the application action of the tracer gas can be conveniently controlled through a switch, the consumption of the tracer gas applied to the shell-side tracer gas leak holes 1 is controlled through a pressure reducing valve flowmeter 15 connected with the rear end, and different tracer gas consumption is applied to leakage leak points of connecting components such as a shell-side flange and a cover plate of the nuclear condenser in a simulation mode.
Based on the system, under the condition of the shell side leakage of the nuclear condenser, the leakage detection process method has the function of testing the leakage detection effect, and specifically comprises the following steps:
step U: the type and the size of the leakage holes are replaced at the position of the tracer gas leakage holes (1) on the shell side of the condenser, so that leakage conditions of different leakage rates can be simulated.
Step V: the type of the tracer gas source (16) is replaced synchronously, and the tracer leak detection equipment (11) is replaced to match the tracer gas source (16).
Step W: and C, referring to the execution steps A-J, testing the influence of the trace gas types and the leak detection process on the trace leak detection effect and the leak detection sensitivity under the condition of different leak rates.
Example six
When the system comprises a condenser shell side trace gas leak 1, a condenser shell side gas inlet 2, a tube bundle side trace gas leak 3, a condenser heat transfer tube bundle 4, a condenser tube sheet 5, a condenser shell side 6, a condenser shell side gas outlet 7, a vacuum component 8, a filter component 9, a drying component 10, a trace leakage detection device 11, a vacuum component gas outlet 12, a condenser cylinder 13, a tube side trace gas application device 14, a pressure reducing valve flowmeter 15 and a trace gas source 16; the tube-side tracer gas applying device 14 is used for uniformly conveying the tracer gas to a specific heat transfer tube bundle on the condenser tube plate 5, is generally formed by sealing covers with different sizes, can be tightly attached to the condenser tube plate 5, and controls the dosage of the tracer gas applied to the heat transfer tube bundle by a pressure reducing valve flowmeter 15 connected with the rear end; the pressure reducing valve flowmeter 15 is used for adjusting the pressure and flow of the trace gas provided by the trace gas source 16 to expected values, and can be used for testing and comparing trace leakage detection effects of different trace gas concentrations and pressures in a simulation system; a trace gas source 16 provides a trace gas for analog system leak detection, which may typically be provided by a gas cylinder.
Based on the system, under the condition of side leakage of the tube of the nuclear condenser, the leakage detection process method has the function of testing the leakage detection effect, and specifically comprises the following steps:
step X: the type and the size of the leak holes are replaced at the position of the trace gas leak holes (3) on the side of the tube bundle, so as to simulate the leakage condition of different leak rates.
Step Y: the type of the tracer gas source (16) is replaced synchronously, and the tracer leak detection equipment (11) is replaced to match the tracer gas source (16).
Step Z: and (3) referring to the execution steps H-T, and testing the influence of the trace gas types and the leak detection process on the trace leak detection effect and the leak detection sensitivity under the condition of different leak rates.
Claims (14)
1. The utility model provides a nuclear condenser tracer leak hunting equipment test analog system which characterized in that: the condenser comprises a condenser barrel (13), tracing leakage detecting equipment (11) and a vacuum component (8), wherein a condenser shell side tracing gas leak hole (1), a condenser shell side gas inlet (2), a tube bundle side tracing gas leak hole (3), a condenser heat transfer tube bundle (4), a condenser tube plate (5) and a condenser shell side gas outlet (7) are arranged on the condenser barrel (13), the condenser shell side (6) is the outer side of the condenser heat transfer tube bundle (4) in the space of the inner side of the condenser barrel (13), the condenser shell side tracing gas leak hole (1), the condenser shell side gas inlet (2) and the condenser shell side gas outlet (7) are respectively connected to the outer wall of the condenser barrel (13), the tube bundle side tracing gas leak hole (3) is a leak hole arranged on one or a plurality of tubes in the condenser heat transfer tube bundle (4), and the condenser tube plate (5) comprises holes with the same arrangement rule as the condenser heat transfer tube bundle (4).
2. The nuclear condenser tracing leak detection equipment test simulation system of claim 1, wherein: the vacuum assembly (8) is provided with a vacuum assembly air outlet (12) which consists of a vacuum pump, a vacuum gauge and a controller, the interior of the condenser shell side (6) is vacuumized through the air outlet (7) at the condenser shell side, and the vacuum degree in the condenser shell side (6) can be maintained in a specific state through the cooperation of the controller and the vacuum gauge.
3. The nuclear condenser tracing leak detection equipment test simulation system of claim 1, wherein: the system also comprises a filter assembly (9) and a drying assembly (10), wherein the filter assembly (9) is connected to one outlet of the vacuum assembly (8) through a sealing pipeline and is connected to the drying assembly (10) through a sealing pipeline, and the mixed gas pumped out by the vacuum assembly (8) is filtered by the filter assembly (9) to filter out particle impurities and enter the drying assembly (10); the drying component (10) is connected to the tracing leakage detecting equipment (11) through a sealed pipeline, and mixed gas with filtered impurities enters the tracing leakage detecting equipment (11) after being dehumidified in the drying component (10).
4. The nuclear condenser tracing leak detection equipment test simulation system of claim 1, wherein: the two sides of the two ends of the condenser heat transfer tube bundle (4) are respectively connected with the condenser tube plate (5) in a sealing and welding way, the inside of the condenser heat transfer tube bundle (4) and the condenser shell side (6) are respectively kept in a sealing state, gas leakage exists only at the trace gas leakage holes (3) on the tube bundle side, the condenser heat transfer tube bundle (4) is inserted into holes on the condenser tube plate (5) and then is connected with the condenser tube plate (5) in a sealing and welding way, and the mixed gas containing the trace gas can be filled into the condenser heat transfer tube bundle (4) through the condenser tube plate (5) during the test.
5. The nuclear condenser tracing leak detection equipment test simulation system of claim 1, wherein: the condenser shell side gas outlet (7) is connected with the vacuum assembly (8) through a sealing pipeline, and gas in the condenser shell side (6) is pumped out by the condenser shell side gas outlet (7).
6. The nuclear condenser tracing leak detection equipment test simulation system of claim 1, wherein: the system comprises a pressure reducing valve flowmeter (15), a trace gas source (16) and a shell-side trace gas application device (17), wherein the shell-side trace gas application device (17) is used for conveying trace gas to a shell-side trace gas leak hole (1) of the condenser.
7. The nuclear condenser tracing leak detection equipment test simulation system of claim 1, wherein: the system comprises a tube-side tracer gas application device (14), a pressure reducing valve flowmeter (15) and a tracer gas source (16), wherein the tube-side tracer gas application device (14) is used for uniformly conveying the tracer gas to a specific heat transfer tube bundle on a condenser tube plate (5).
8. A method of testing a condenser flange or cover plate based on the simulation system of any one of claims 1-5, wherein: which comprises the following steps:
a. recording a vacuum gauge signal of the vacuum assembly (8), recording a stable signal output by the tracing leakage detecting equipment (11) and taking the stable signal as a background signal S 0 ；
b. Obtaining an output signal of the condenser shell side trace gas leakage hole (1) in an open state and recording the signal as a reference leakage signal S 1 ；
c. Obtaining an output signal of the condenser shell side trace gas leakage hole (1) in a closed state and recording the signal as a leakage signal S 2 ；
d. Will leak signal S 2 And background signal S 0 In contrast, use formula Q 2 ＝Q 1 ×(S 2 -S 0 )/(S 1 -S 0 ) And calculating and judging leakage condition of the flange or the cover plate component of the condenser.
9. A method according to claim 8, wherein in step a: firstly, a condenser shell side trace gas leak hole (1), a condenser shell side gas inlet (2) and a tube bundle side trace gas leak hole (3) are set to be closed, a vacuum component (8) and trace leakage detection equipment (11) are set and started, and under the operation of the vacuum component (8), the gas in the condenser shell side (6) is pumped out and gradually forms a vacuum state, the trace leakage detection equipment (11) extracts part of the gas at the outlet of the vacuum component (8) and obtains a signal of the corresponding trace gas content, and the vacuum meter signal of the vacuum component (8) and the output signal of the trace leakage detection equipment (11) are waited for being stable and forming a vacuum stateRecording a signal as a background signal S 0 。
10. A method according to claim 8, wherein in step b: setting the state of a tracer gas leakage hole (1) at the shell side of the condenser as open, and setting the nominal leakage rate Q of the tracer gas leakage hole (1) at the shell side of the condenser 1 The arrangement of other parts is unchanged, trace gas enters the condenser shell side (6) through the trace gas leakage hole (1) at the condenser shell side under the vacuum effect and is pumped to the outlet of the vacuum component (8), and trace leakage detection equipment (11) extracts part of gas for analysis, obtains an output signal and records the signal as a reference leakage signal S 1 。
11. A method according to claim 8, wherein in step c: setting the state of a tracer gas leak hole (1) at the shell side of the condenser to be closed, applying tracer gas to a flange or a cover plate part of the condenser, extracting part of gas by a tracer leak detection device (11) for analysis, obtaining an output signal and recording the signal as a leak signal S 2 。
12. A method of testing a condenser heat transfer tube based on the simulation system of any one of claims 1-5, wherein: which comprises the following steps:
f. closing a shell side trace gas leakage hole (1) of the condenser, and waiting for a leakage signal output by trace leakage detection equipment (11) to be reduced to a background signal S 0 ；
g. The tube bundle side trace gas leak hole (3) is set to be opened, an output signal is obtained and the signal is recorded as a reference leak signal S 3 ；
h. The tube bundle side trace gas leak (3) is set to be closed, an output signal is obtained and the signal is recorded as a leak signal S 4 ；
i. Will leak signal S 4 And background signal S 0 In contrast, use formula Q 4 ＝Q 3 ×(S 4 -S 0 )/(S 3 -S 0 ) And calculating and judging the leakage condition of the heat transfer tube of the condenser.
13. A method according to claim 12, wherein in step g: setting the tube bundle side trace gas leakage hole (3) to be opened, and nominal leakage rate Q of the tube bundle side trace gas leakage hole (3) 3 The arrangement of other parts is unchanged, trace gas enters the condenser shell side (6) through the tube bundle side trace gas leakage holes (3) under the vacuum effect and is pumped to the outlet of the vacuum component (8), and trace leakage detection equipment (11) extracts part of gas for analysis, obtains output signals and records the signals as reference leakage signals S 3 。
14. A method according to claim 12, wherein in step h: the tracer gas leakage holes (3) on the tube bundle side are set to be closed, mixed gas containing tracer gas is released into the condenser heat transfer tube bundle (4) at the condenser tube plate (5), part of gas is extracted by the tracer leak detection equipment (11) for analysis, an output signal is obtained, and the signal is recorded as a leakage signal S 4 。
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