CN205670026U - A kind of blank measuring device for gas of turbine vacuum system - Google Patents
A kind of blank measuring device for gas of turbine vacuum system Download PDFInfo
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- CN205670026U CN205670026U CN201620405745.0U CN201620405745U CN205670026U CN 205670026 U CN205670026 U CN 205670026U CN 201620405745 U CN201620405745 U CN 201620405745U CN 205670026 U CN205670026 U CN 205670026U
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Abstract
This utility model provides a kind of blank measuring device for gas of turbine vacuum system, described measurement apparatus is connected with condenser, described condenser is connected with steam turbine, it is characterized in that, described measurement apparatus includes the test pipeline being connected with described condenser, the first valve being arranged on described test pipeline and the second valve and the first negative throat noz(zle), described first negative throat noz(zle) is arranged on the testing tube great distance end from described condenser, and the diameter of this first negative throat noz(zle) inlet side is more than the diameter of outlet side；Being provided with sensing detection module in described measurement apparatus, the signal feedback end of this sensing detection module is connected with calculation control module.This device can accurately and reliably safety the blank tolerance of test turbine vacuum system, facilitate the tightness of the quantitative evaluation vacuum system of plant personnel, beneficially thermal power plant management personnel quantitative assessment different capabilities wet type cooling unit, vacuum system strictness between Air-cooled Unit and wet type cooling unit and Air-cooled Unit.
Description
Technical field
The invention belongs to vacuum degree measurement technical field, be specifically related to a kind of turbine vacuum system leakage air-quantity measuring dress
Put.
Background technology
Vacuum System Tightness of Steam Turbines is the important indicator being related to Turbine Safety, economical operation.Evaluate vapour at present
The index of turbine vacuum system strictness is the vacuum dropping speed that vacuum system tightness test obtains, i.e. by test to vapour
The blank tolerance of turbine vacuum system provides qualitative results.But research finds, vacuum dropping speed is not the unit interval to leak into sky
The monotropic function of tolerance, therefore vacuum dropping speed can not accurately reflect the tightness situation of turbine vacuum system；Secondly,
Owing to the volume of different turbine vacuum systems is different, boundary parameter during vacuum tightness test is inconsistent, uses breaking of vacuum
Velocity amplitude goes to evaluate the vacuum tightness index between different unit can not adapt to wanting of thermal power generating equipment fine-grained management
Ask.
The equipment that turbine vacuum system relates to is many, and scope is wide, and air leaks into and is difficult to avoid that.Everywhere is leak into air capacity
It is unpractical for measuring.And in the import and export pipeline of air-extractor, vapour, gas-liquid mixture are measured, by tested
The impact of gaseous state parameter, test value relatively actual value deviation is bigger.At present, the measuring principle that industry is more admitted is the former Soviet Union
Blocking what other Milunovich proposed, i.e. under condenser duty, cooling water inlet temperature, cooling water flow permanence condition, stoppage in transit is taken out
Vapour equipment, vacuum system decrease speed is proportional with the air mass flow putting into turbine vacuum system.Utility model patent
201320483928.0, utility model patent 201320253706.X etc. are the principle design proposed according to the other Milunovich of card
The blank measuring device for gas of turbine vacuum system, the key problem in technology point of this device be the most accurately and reliably safety put into quantitatively
Air, simply describes air flow meter and the regulation valve of regulation air mass flow, by air matter in above-mentioned two patent
The equipment cost that the mode of amount effusion meter measures MAF is high, and the reliability of air flow rate adjustment valve is the highest and air
The features such as flowed fluctuation is big, have impact on the application in actual production process of this device.
Utility model content
The purpose of this utility model is to provide a kind of blank measuring device for gas of turbine vacuum system, has reliability
High, measurement result feature accurately.
This utility model provides following technical scheme: a kind of blank measuring device for gas of turbine vacuum system, institute
Stating measurement apparatus to be connected with condenser, described condenser is connected with steam turbine, it is characterised in that described measurement apparatus includes and institute
State test pipeline, the first valve being arranged on described test pipeline and the second valve and the first tapered spray that condenser is connected
Mouth, described first negative throat noz(zle) is arranged on the testing tube great distance end from described condenser, this first negative throat noz(zle) inlet side
Diameter more than outlet side diameter；Sensing detection module it is provided with, the letter of this sensing detection module in described measurement apparatus
Number feedback end is connected with calculation control module.
Preferably, it is provided with the test being connected with described test pipeline between described first valve with described second valve to prop up
Road, described test branch road has been arranged in series the 4th valve and the second negative throat noz(zle), this second negative throat noz(zle) inlet side straight
Footpath is more than the diameter of outlet side.
Preferably, described sensing detection module includes barometric pressure sensor, environment temperature sensor and condenser pressure
Sensor.
Preferably, described condenser pressure sensor is arranged on described condenser.
Preferably, it is provided with the 3rd valve between described second valve and described first negative throat noz(zle).
Preferably, it is provided with the 5th valve between described 4th valve and described second negative throat noz(zle).
Preferably, described measurement apparatus is encapsulated as an overall and described condenser and is connected.
Preferably, described calculation control module is connected with user interface display module
The beneficial effects of the utility model are: the test turbine vacuum system that this device can be safe accurately and reliably is blank
Tolerance, facilitates the tightness of the quantitative evaluation vacuum system of plant personnel, beneficially thermal power plant management personnel quantitative assessment different
Vacuum system strictness between capacity wet type cooling unit, Air-cooled Unit and wet type cooling unit and Air-cooled Unit.
Accompanying drawing explanation
Accompanying drawing is for providing a further understanding of the present invention, and constitutes a part for description, with the reality of the present invention
Execute example together for explaining the present invention, be not intended that limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the theory diagram of the present invention.
In figure: 1-condenser, 2-steam turbine, 3-the first valve, 4-the second valve, 5-the first negative throat noz(zle), 6-calculate control
Molding block, 7-the 4th valve, 8-the second negative throat noz(zle), 9-barometric pressure sensor, 10-environment temperature sensor, 11-condenser
Pressure transducer, 12-the 3rd valve, 13-the 5th valve, 14-user interface display module.
Detailed description of the invention
As it is shown in figure 1, a kind of steam turbine 2 blank measuring device for gas of vacuum system, measurement apparatus is connected with condenser 1,
Condenser 1 is connected with steam turbine 2, and this measurement apparatus includes the test pipeline being connected with condenser 1, is arranged on test pipeline
First valve 3 and the second valve 4 and the first negative throat noz(zle) 5, the first negative throat noz(zle) 5 is arranged on testing tube great distance from condenser 1
End, the diameter of this first negative throat noz(zle) 5 inlet side more than outlet side diameter；Sensing inspection it is provided with in measurement apparatus
Surveying module, the signal feedback end of this sensing detection module is connected with calculation control module 6.This device can accurately and reliably safety
The test steam turbine 2 blank tolerance of vacuum system, facilitates the tightness of quantitative the evaluations vacuum system of plant personnel, is conducive to the most fiery
Power plant management personnel's quantitative assessment different capabilities wet type cooling unit, true between Air-cooled Unit and wet type cooling unit and Air-cooled Unit
Do-nothing system tightness.
In order to realize detection, it is provided with between the first valve 3 with the second valve 4 and tests the test branch road that pipeline is connected,
Being arranged in series the 4th valve 7 and the second negative throat noz(zle) 8 on test branch road, the diameter of this second negative throat noz(zle) 8 inlet side is big
Diameter in outlet side.Above-mentioned sensing detection module includes barometric pressure sensor 9, environment temperature sensor 10 and condensing
Device pressure transducer 11, condenser pressure sensor 11 is arranged on condenser 1.
In order to realize reliably controlling, between the second valve 4 and the first negative throat noz(zle) 5, it is provided with the 3rd valve 12, the 4th valve
It is provided with the 5th valve 13 between door 7 and the second negative throat noz(zle) 8.Easy to make in order to install, said apparatus and pipeline can be complete
Portion is packaged into entirety, and the pipeline and the signal transmssion line that are only connected with condenser 1 by the first valve 3 are drawn from the overall of encapsulation, with
Just measurement apparatus and condenser 1 and computer data acquiring and analysis system are connected measurement apparatus and are encapsulated as an overall and condenser
1 is connected.For the ease of user's Real Time Observation, calculation control module 6 is connected with user interface display module 14.
Ultimate principle of the present utility model is: the front principle blocking the proposition of other Milunovich according to the former Soviet Union, vacuum dropping speed
The relation being directly proportional to the air mass flow putting into steam turbine 2 vacuum system, under a certain steady working condition of steam turbine 2, it is assumed that leak into
The air mass flow of vacuum system is G0, and the rate of vacuum drop measured value after corresponding stoppage in transit air-extractor is VH0, is ensureing unit fortune
On the premise of line parameter is stable, it is vented valve by condenser 1 and puts into different air mass flow G1, G2, G3 ... Gj, pass through unit
Vacuum tightness test measurement correspondence is each puts into breaking of vacuum speed VH1 of unit under air mass flow, VH2, VH3 ..., VHj.
To put into air mass flow Gi as abscissa, breaking of vacuum speed VHi is vertical coordinate, and being connected by each intersection point just obtains expression and put into sky
Throughput and the linear relationship of rate of vacuum drop, extend straight line and intersect with abscissa, and the air mass flow of intersection point is puts into sky
Blank throughput G of vacuum system before gas.
According to the first law of thermodynamics, when the flow velocity of fluid rises, then fluid pressure drop, gas is in negative throat noz(zle)
During flowing, when the pressure P2 of jet expansion is less than critical pressure Pcr, i.e. fluid flow operating mode in negative throat noz(zle) reaches to surpass and faces
During boundary's operating mode, the flow velocity of fluid reaches local velocity of sound a, and the fluid flow now by negative throat noz(zle) reaches maximum.
Be 0.528 for its critical pressure ratio of air, be connected with condenser 1 by negative throat noz(zle), then condenser 1 pressure is with big
Ratio between air pressure i.e. critical pressure ratio is typically between 0.04～0.12, and its critical pressure ratio is far below the critical pressure of air
Force rate, therefore by negative throat noz(zle) just can be quantitative put into outside air to condenser 1.
Operational approach of the present utility model includes that water chiller confirms that condition and Air-cooled Unit confirm condition, wherein water cooling unit
Group acknowledge condition includes a. generating set group steady load；B. condenser 1 thermic load is stable；C. cooling water inlet temperature is stable；
D. cooling water flow remains stable.Air-cooled Unit confirms that condition includes a. generating set steady load；B. air cooling tubes condenser 1
Thermic load is stable；C. Air-Cooling Island top edge wind speed is less than 3m/s；D. air cooling blower fan frequency remains stable
Operating procedure of the present utility model: open the first valve 3, the second valve 4, the 3rd valve 12；Stop vacuum pump, close
Vacuum pump evacuates feed channel inlet valve, carries out vacuum tightness test for the first time；Recover vacuum pump to run, close the second valve
4, the 3rd valve 12, the state before making condenser 1 vacuum return to test；Open the 4th valve the 7, the 5th valve 13；Stop vacuum
Pump, cuts out vacuum pump and evacuates feed channel inlet valve, carries out second time vacuum tightness test；Recover vacuum pump to run, close
4th valve 7, the 5th valve 13, the state before making condenser 1 vacuum return to test；Test terminates, and computer is to gathering number
According to being analyzed calculating, draw the steam turbine 2 blank tolerance of vacuum system.
The blank air volume calculation method of negative throat noz(zle) in this utility model, derives according to Engineering Thermodynamics correlation theory, gradually
The maximum MAF that contracting nozzle can circulate can calculate with following formula:
In formula: GiFor MAF, kg/h；ζ is coefficient in common use；P is atmospheric pressure, Pa；T is ambient temperature, DEG C；
diFor diameter, m at negative throat noz(zle) smallest cross-sectional.
MAF through the first negative throat noz(zle) is G1, and corresponding vacuum tightness value is VH1；Tapered through second
The MAF of nozzle is G2, and corresponding vacuum tightness value is VH2；Then this steam turbine 2 blank tolerance of vacuum system is:
These are only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment
Being described in detail the present invention, for a person skilled in the art, it still can be to foregoing embodiments institute
The technical scheme recorded is modified, or wherein portion of techniques feature is carried out equivalent.All spirit in the present invention and
Within principle, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (8)
1. the blank measuring device for gas of turbine vacuum system, described measurement apparatus is connected with condenser, described condenser
Be connected with steam turbine, it is characterised in that described measurement apparatus include the test pipeline being connected with described condenser, be arranged on described
Testing the first valve on pipeline and the second valve and the first negative throat noz(zle), described first negative throat noz(zle) is arranged on test pipeline
Away from the end of described condenser, the diameter of this first negative throat noz(zle) inlet side is more than the diameter of outlet side；Described measurement
Being provided with sensing detection module on device, the signal feedback end of this sensing detection module is connected with calculation control module.
A kind of blank measuring device for gas of turbine vacuum system the most according to claim 1, it is characterised in that described the
It is provided with the test branch road being connected with described test pipeline between one valve with described second valve, described test branch road is connected
Being provided with the 4th valve and the second negative throat noz(zle), the diameter of this second negative throat noz(zle) inlet side is more than the diameter of outlet side.
A kind of blank measuring device for gas of turbine vacuum system the most according to claim 1, it is characterised in that described biography
Sense detection module includes barometric pressure sensor, environment temperature sensor and condenser pressure sensor.
A kind of blank measuring device for gas of turbine vacuum system the most according to claim 3, it is characterised in that described solidifying
Vapour device pressure transducer is arranged on described condenser.
A kind of blank measuring device for gas of turbine vacuum system the most according to claim 1, it is characterised in that described the
It is provided with the 3rd valve between two valves and described first negative throat noz(zle).
A kind of blank measuring device for gas of turbine vacuum system the most according to claim 2, it is characterised in that described the
It is provided with the 5th valve between four valves and described second negative throat noz(zle).
A kind of blank measuring device for gas of turbine vacuum system the most according to claim 1, it is characterised in that described survey
Amount device is encapsulated as an overall and described condenser and is connected.
A kind of blank measuring device for gas of turbine vacuum system the most according to claim 1, it is characterised in that described meter
Calculate control module to be connected with user interface display module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620405745.0U CN205670026U (en) | 2016-05-06 | 2016-05-06 | A kind of blank measuring device for gas of turbine vacuum system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620405745.0U CN205670026U (en) | 2016-05-06 | 2016-05-06 | A kind of blank measuring device for gas of turbine vacuum system |
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| Publication Number | Publication Date |
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| CN205670026U true CN205670026U (en) | 2016-11-02 |
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| CN201620405745.0U Active CN205670026U (en) | 2016-05-06 | 2016-05-06 | A kind of blank measuring device for gas of turbine vacuum system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106940329A (en) * | 2017-03-01 | 2017-07-11 | 榆林学院 | It is a kind of to measure the experimental provision that the air amount of leaking into condenses influence on steam |
-
2016
- 2016-05-06 CN CN201620405745.0U patent/CN205670026U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106940329A (en) * | 2017-03-01 | 2017-07-11 | 榆林学院 | It is a kind of to measure the experimental provision that the air amount of leaking into condenses influence on steam |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 210046 fairyland Road, Qixia District, Nanjing, Jiangsu Province, No. 10 Patentee after: Guodian Nanjing electric power test & Research Co., Ltd. Address before: 210046 fairyland Road, Qixia District, Nanjing, Jiangsu Province, No. 10 Patentee before: Nanjing Power Equipment Quality & Performance Test Center |
|
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 210046 fairyland Road, Qixia District, Nanjing, Jiangsu Province, No. 10 Patentee after: Guoneng Nanjing Electric Power Test Research Co.,Ltd. Address before: 210046 fairyland Road, Qixia District, Nanjing, Jiangsu Province, No. 10 Patentee before: GUODIAN NANJING ELECTRIC POWER TEST RESEARCH Co.,Ltd. |