CN105865550A - Gas spray pipe flow measuring device capable of online calibration - Google Patents
Gas spray pipe flow measuring device capable of online calibration Download PDFInfo
- Publication number
- CN105865550A CN105865550A CN201610410545.9A CN201610410545A CN105865550A CN 105865550 A CN105865550 A CN 105865550A CN 201610410545 A CN201610410545 A CN 201610410545A CN 105865550 A CN105865550 A CN 105865550A
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- Prior art keywords
- spray speed
- port
- speed pipe
- pipeline section
- measuring device
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
- G01F1/661—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters using light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
- G01F1/663—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters by measuring Doppler frequency shift
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
- G01F25/15—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters specially adapted for gas meters
Abstract
The invention relates to a gas spray pipe flow measuring device capable of online calibration, comprising: a pipe segment for passage of gas; a spray pipe mounted in the pipe segment and having a first port and a second port; a differential pressure transmitter measuring a pressure difference between the first port and second port of the spray pipe; the device is characterized in that the pipe segment is provided with a transparent window, projection of the transparent window on a pipe wall covers projection of the second port of the spray pipe on the pipe wall; a laser Doppler flow rate meter is disposed outside the pipe segment, and laser emitted by the Doppler flow rate meter passes through the transparent window and measures flow rate at the second port of the spray pipe. The spray pipe flow measuring device can run reliably and measure accurately, and a calibration method has a clear process and is convenient to operate.
Description
Technical field
The present invention relates to a kind of gas spray speed pipe flow measuring device, particularly relate to one based on Doppler laser velocimeter to flow
Carry out the spray speed pipe flow measuring device of on-line calibration.
Background technology
Gas flow measurement has demand and application widely in fields such as the energy, environment, manufactures.Storage such as natural gas is transported,
The discharge of power plant combustion waste gas, the air-supply etc. of steel mill's blast furnace steel-making, it is required for gas flow is measured.Gas flowmeter kind
Class is many, including turbine flowmeter, ultrasonic flowmeter, differential pressure flowmeter etc..Effusion meter needs to carry out periodically school in use
Standard, could obtain measurement result accurately, meets the requirement of situ flow measurement.Existing calibration mode and under the conditions of, use
Family need to be transported to the flow detection laboratory having rated capacity, on flow standard device by effusion meter from measuring dismounting pipeline
Calibrate.After completing calibration, effusion meter is returned to user, can carry out flow measurement after reinstalling debugging.
Different field industry is the biggest to gas flow measurement demand difference.First, tested gas medium kind is many, gas medium thing
The difference of property parameter can affect certainty of measurement.Secondly, the pressure of situ flow measurement and range of flow width, need different principle,
The effusion meter of different bores meets measurement demand.Additionally, the mounting condition complexity that flow measurement is on-the-spot, use environment various, all
Give accurately to measure and cause difficulty.This difficulty requires that the flow standard device for effusion meter calibration possesses perfect calibration function,
Under various conditions different effusion meters is calibrated, be only possible to ensure the reliable effective of field measurement data.But flux scale
Standard apparatus construction land area is big, manufactures operating cost high, and energy consumption is many, is white elephant for a user.Additionally, part
User is in order to complete calibration, it has to stopping producing, and removing and installing with traffic flow gauge is also high expenditure, this all causes
The loss of economic benefit.
Based on the problems referred to above, the effusion meter possessing on-line calibration function is considered as effective way and the instrument of solution problem.But,
Current existing gas flowmeter is all difficult to flow on-line calibration in fact.
Summary of the invention
The invention aims to solve gas flowmeter real stream on-line calibration problem, it is proposed that a kind of based on laser-Doppler stream
Speed instrument (LDV) can the spray speed pipe flow measuring device of on-line calibration, the measurement of gas flow in closed conduct.
The invention discloses a kind of based on Doppler laser velocimeter (LDV) can the spray speed pipe flow measuring device of on-line calibration,
The measurement of gas flow in closed conduct.Wherein, Doppler laser velocimeter can measure the flow field velocity in spray speed pipe exit
With distribution, obtain flow by the speed in integration flow field, this flow is defined as normal flow.By standard of comparison flow and spray
The nominal flow capacity that speed pipe flow measuring device obtains, calculates the calibration factor of spray speed pipe flow measuring device, it is achieved measurement apparatus
On-line calibration.Spray speed pipe flow measuring device reliable operation, measures accurately, and calibration steps clear process is easy to operate.
The based on Doppler laser velocimeter (LDV) of the present invention can the spray speed pipe flow measuring mass flow device of on-line calibration；Stream
Gauge may be installed in closed conduct, measures the state parameters such as differential pressure under certain flow.Based on effusion meter inner chamber profile set
Meter, the flow velocity of jet flow field core space is evenly distributed.Boundary region stably can be surveyed.
The invention provides a kind of can the gas spray speed pipe flow measuring device of on-line calibration, comprising: pipeline section, it is used for gas
Circulation；Spray speed is managed, and it is installed in described pipeline section, and described spray speed pipe has the first port and the second port；Differential pressure transporting
Device, it measures the pressure differential between the first port and second port of described spray speed pipe；Described pipeline section is provided with transparent window,
The projection on tube wall of the described transparent window covers the projection on tube wall of the second port of described spray speed pipe；Outside described pipeline section
Being provided with Doppler laser velocimeter, transparent window described in the laser light that described Doppler laser velocimeter sends, to described spray
The flow of the second port of speed pipe measures.
Wherein, described pipeline section is at least two, and is connected with each other.
Wherein, the sidewall of described pipeline section is provided with pressure transmitter.
Wherein, described pressure transmitter is near the first port of described spray speed pipe.
Wherein, described transparent window is double-layer sealing structure.
Wherein, the diameter range of described pipeline section is 3～3000mm.
Wherein, the diameter of the first port of described spray speed pipe is more than the diameter of described second port.
Wherein, the one in the shape such as described pipeline section generally circular in shape, rectangle, polygon or the combination in any of above-mentioned shape.
The present invention provides a kind of on-line calibration method based on Doppler laser velocimeter (LDV).Through being arranged on flow
Transparent window on meter, Doppler laser velocimeter (LDV) can realize the measurement of stream field VELOCITY DISTRIBUTION.Flow passes through flow field
The rate integrating of each point obtains.Wherein, the design of spray speed tube cavity curved surface can realize the equal of certain differential pressure Fluid field core space speed
Even distribution, can realize effective control of boundary layer thickness.Wherein, the shrinkage ratio scope of spray speed pipe is from 3: 1～9: 1.Wherein, spray speed
The position that pipe flow measuring device differential pressure measurement is chosen is chosen after being computed design, can obtain the differential pressure of accurate stable under present flow rate
Value.Wherein, during spray speed cell measurement apparatus calibration, transparent window need to be installed.Rely on the double-layer seal mechanism of device itself, transparent regard
Window may be implemented in line (not stopping) installing/dismounting.Wherein, by filling certain density trace particle, how general laser can be realized
Strangle the current meter (LDV) measurement to gas flow rate.
The advantage of the method is: may be implemented in line calibration, it is not necessary to dismantles when calibration or reinstalls effusion meter, it is not necessary to turning off
Or the gas of flowing in pipeline of stopping.
Accompanying drawing explanation
Fig. 1 sprays speed pipe flow measuring device structural representation.
Detailed description of the invention
For the ease of understanding the present invention, illustrating embodiments of the invention below in conjunction with the accompanying drawings, those skilled in the art should
Working as understanding, following explanation is only to facilitate explain invention, and limits not as to the concrete of its scope.
Fig. 1 show the spray speed pipe flow measuring device structural representation of the present invention.Described measurement apparatus include the first pipeline section 1,
Second pipeline section 10 and the 3rd pipeline section 9, wherein, is bolted between the first pipeline section 1 and the second pipeline section 10, described second
May be used without bolt between pipeline section 10 and the 3rd pipeline section 9 to connect, described first pipeline section the 1, second pipeline section 10 and the 3rd pipeline section 9
Between not only by bolt connect, it is also possible to be attached by other connected mode.
The direction of arrow as shown in Figure 1 is the flow direction of the gas in described measurement apparatus, at the sidewall of described first pipeline section 1
On pressure transmitter 3 is installed, described pressure transmitter 3 can provide the pressure to sidewall of the gas in pipeline, so-called pressure
Transmitter is that the mechanical signal of pressure is transformed into current signal, and wherein, pressure becomes with the voltage in electronic signal or size of current
Linear relationship, calculates the size of pressure according to electronic signal.
In the first pipeline section 1 and junction of the second pipeline section 10, connecting further and have spray speed pipe 5, described spray speed pipe 5 is by rustless steel
Or other high-strength materials make, described spray speed pipe 5 has the first port and the second port, and be positioned at described first port and
Arc tube wall between second port；Have on first port of described spray speed pipe 5 and outward extend flange, preferably described convex
There is on edge multiple through hole, in the both sides of described flange, there is annular groove, the rubber of circle can be set in the annular groove of two
Leather packing, the bolt the first pipeline section 1 and the second pipeline section 10 linked together, will through the through hole on the flange of described first port
Described spray speed pipe 5 is fixed between the first pipeline section 1 and the second pipeline section 10, and two valve rubbers are managed with the first pipeline section 1 and second respectively
Section 10 coordinates the sealing of reality junction.As the most preferably, described spray speed pipe 5 can be connected to by the way of flange
Between first pipeline section 1 and the second pipeline section 10.
The bore scope of the pipeline that described first pipeline section the 1, second pipeline section 10 and the 3rd pipeline section 9 are formed is 3～3000mm；Described
Pipe shape is round pipe, the one in the shape such as rectangular duct, polygonal shape tubes or the combination in any of above-mentioned pipeline；Described
Pipeline can be to be horizontally mounted, and vertically-mounted or inclination is installed.
The diameter of the first port of described spray speed pipe 5 is more than the diameter of described second port, and the diameter of the first port is to the second port
Direction is gradually reduced, and the mode of reduction is that the camber line mode of the tube wall according to spray speed pipe is shunk, the inner surface of described tube wall and appearance
Face is curved form, can realize certain differential pressure Fluid field core space speed by the design that cavity inner surface is curved surface of spray speed pipe 5
Be uniformly distributed, effective control of boundary layer thickness can be realized.First port of described spray speed pipe 5 has relative to the second port
Certain shrinkage ratio, wherein, spray speed pipe is punctured into 3: 1, and the diameter of the first port is three times of the second port diameter, as
Further improving, reduce the diameter of described second port further, shrinkage ratio becomes 5: 1, and the diameter of the i.e. first port is the
Five times of Two-port netwerk；As the most preferably, reducing the diameter of described second port, shrinkage ratio becomes 9: 1, as this
Shrinkage ratio, in the range of 3: 1～9: 1, certainly according to concrete pipeline needs, can be configured by the described shrinkage ratio of bright improvement,
Being not limited between 3: 1～9: 1, the scope of its shrinkage ratio can be less than 3: 1, it addition, the scope of shrinkage ratio can also be more than 9: 1.
It is provided with differential pressure transmitter 4 between the installation site and the second port of described spray speed pipe 5 of described pressure transmitter 3,
The pressure differential between the second port of the first pipeline section 1 and spray speed pipe 5 can be obtained by described differential pressure transmitter 4, thus pass through
Calculate the uninterrupted obtained in pipeline section.
Having scattering particles adder 2 on described first pipeline section 1, described scattering particles adder 2 has and is positioned at the first pipeline section 1
In interpolation port, particle is scattered out from described interpolation port, thus be diffused in the first pipeline section 1, from spray speed pipe 5
First port enters, and sprays, on described second pipeline section 10 from the second port of the spray speed pipe 5 being positioned at the second pipeline section 10
Having transparent window 8, described transparent window 8 has overlapping part with the spray speed pipe 5 projection on the tube wall of the second pipeline section 10,
Thus the scope of described transparent window 8 covers the second port of described spray speed pipe 5, the projection on tube wall of the described transparent window is covered
Covering second port projection on tube wall of described spray speed pipe, from the second port of described spray speed pipe 5, the scattering particles of ejection leads to
Cross described transparent window 8 can be observed.Adding in the gas in described first pipeline section 1, the scattering particles of generation is with gas
Body flows at transparent window through spray speed pipe.Wherein, during described spray speed cell measurement apparatus calibration, transparent window need to be installed.Rely on dress
Putting the double-layer seal mechanism of itself, transparent window may be implemented in line (not stopping) installing/dismounting.
For the ease of the safe operation of pipeline, the described transparent window 8 pipeline in position uses double-layer sealing structure form, flat
When Shi Guandao normally works, using metal or other sealing version, two-layer seals structure and is in sealing state, in institute
State and not there are gas flow between two-layer sealing structure, before being ready for calibration, outermost layer is sealed structure and is replaced with
Photopic vision window 8, described transparent window 8 preferably can use the quartz glass of high permeability to make, when the replacing completing transparent window 8
After, the internal layer sealing structure that described two-layer seals in structure is opened, it is preferred to use autocontrol valve or other controllable modes
Open.
Also including temperature sensor 7 in described second pipeline section 10, described temperature sensor 7 is used for measuring described second pipeline section
The temperature of the gas in 10.
Being provided with Doppler laser velocimeter 6 outside the pipeline of the second pipeline section 10, described Doppler laser velocimeter 6 measures spray
The velocity flow profile in speed pipe 5 exit, is integrated velocity flow profile calculating, and obtains flowing through the actual flow of spray speed pipe.
In the present invention, flow is to be obtained the integration of jet area by a flow velocity.Can accurately measure a flow velocity be to realize stream
The key of measurement.The present invention measures each point flow velocity in jet flow field by Doppler laser velocimeter 6.Laser-Doppler flow velocity
The metering system of instrument 6 is non-cpntact measurement, it is to avoid destruction to jet flow field, will not form blocking effect, its sky measured
Between resolution higher, about 2mm3Left and right.Concrete measuring principle is as follows:
As it is shown in figure 1, be positioned at the scattering particles adder 2 of the described first pipeline section 1 interpolation scattering particles in the first pipeline section 1,
Described scattering particles sprays from the second port of described spray speed pipe 5, transparent described in the laser light of Doppler laser velocimeter 6
Form 8, is radiated at the near exit of the second port of described spray speed pipe 5, and Doppler laser velocimeter 6 utilizes and is spread out over gas
In servo-actuated microgranule scattered light Doppler frequency shift obtain gas speed.Specifically, described Doppler laser velocimeter 6 is adopted
Use dual-beam pattern, from described Doppler laser velocimeter 6, send two bundles be concerned with Gauss light, described Gauss light at space intersection,
Formed in crossing region and measure body, measure in body and form light and dark interference fringe.When the scattering particles following fluid passes through
When measuring body, there is relation in the Doppler frequency of the light intensity signal of KPT Scatter and the movement velocity of particle:
Wherein, λ is the wavelength launching light, and θ is the angle of two bundle coherent lights, and f is Doppler frequency.In formula (1),
Characterizing and measure the spacing of interference fringe in body, f characterizes the scattering particles transition time through measurement body, vLDAMany for laser
The point flow velocity that Pu Le measurement obtains.Formula (1) shows: it is how general that the certainty of measurement of Doppler frequency f and fringe spacing determines laser
Strangle the certainty of measurement of current meter LDV.Doppler laser velocimeter is after accurate calibration, and the certainty of measurement of some flow velocity can reach 0.2%
Rate accuracy.
The calibration process of spray speed pipe flow measuring device: when the gas in pipeline flows through spray speed pipe 5, due to the receipts of spray speed pipe 5
Casing coupling stream, can produce certain differential pressure in spray speed pipe 5 both sides.There is quantitative relationship in differential pressure and the flow flowing through spray speed pipe 5.As
Really pass through traffic alignment to realize spray speed manages the correction thinking measurement model, i.e. accurate quantification differential pressure and the quantitative relationship of flow, just
Gas flow can be accurately measured with spray speed cell measurement apparatus.The second of spray speed pipe 5 is measured by application Doppler laser velocimeter
The flow field velocity in the exit of port is distributed, and then stream field VELOCITY DISTRIBUTION is integrated, and can obtain jet volume flow.By
Jet at spout outlet maintains good seriality with the flowing in upstream line, and therefore Doppler laser velocimeter 6 is surveyed
The jet flow measured is the flow in pipeline.Using jet flow as normal flow, the name stream recorded with spray speed pipe 5
Amount compares, and can realize spraying the calibration of speed cell measurement apparatus, it is determined that differential pressure and the quantitative relationship flowing through spray speed pipe flow amount.Laser
The normal flow q that doppler velocimeter measurement obtainssCan be obtained by formula (2):
qs=∫ vLDAdA (2)
Wherein, vLDAThe point flow velocity obtained for laser Doppler measuring.
On-line calibration process: as shown in Figure 1: spray speed pipe flow measuring device is arranged in gas pipeline in the way of Flange joint.
The absolute pressure of gas is recorded by spraying speed pipe upstream line pressure, simultaneously in the exit of the second port of spray speed pipe 5 with annular
Mode pressure, records the differential pressure at spray speed pipe two ends.The temperature of gas is recorded by the temperature sensor 7 being arranged on spray speed pipe exit.
The interior cross-sectional area of the second port outlet of spray speed pipe 5 can record in a pre-installation, when the gas in pipeline flows through spray speed pipe flow amount
Timing, measures the absolute pressure of gas, the differential pressure of spray speed pipe, the temperature of gas, can be calculated the name stream that spray speed pipe is current
Amount, nominal flow capacity qi can be obtained by formula (3):
Wherein, cdThe efflux coefficient of spray speed pipe, characterizes the VELOCITY DISTRIBUTION of jet flow field and the correction of boundary region in integrating flow；A
Area for spray speed pipe outlet；Δ p is the differential pressure at subsonic speed spout two ends；ρ is the density of Jetstream fluid.
The present invention by installing scattering particles adder in measurement apparatus upstream, and the scattering particles of generation moves through spray speed pipe flow with gas
To transparent window.Measured the velocity flow profile in spray speed pipe exit by Doppler laser velocimeter, velocity flow profile is integrated meter
Calculate, obtain flowing through the actual flow of spray speed pipe.The quantitative relationship of nominal flow capacity and actual flow is set up, i.e. under different flows
The on-line calibration to spray speed pipe flow measuring device can be realized.The efflux coefficient of speed pipe can be sprayed by formula (2), (3).
In certain range of flow, obtain spraying the efflux coefficient c of speed pipedAfter, when measuring gas flow, measure spray speed pipe in real time
The differential pressure at two ends, the temperature, pressure of Gas Jet, the gas flow in pipeline can be calculated.Application Doppler laser velocimeter
Spray speed pipe device is carried out periodic calibration, it is ensured that the Stability and veracity that spray speed pipe device is long-term.
The Doppler laser velocimeter of the present invention has a wide range of applications in flow-speed measurement, has accuracy high, non-cpntact measurement,
The advantages such as dynamic response is fast.
Although it is understood that the present invention discloses as above with preferred embodiment, but above-described embodiment is not limited to
The present invention.For any those of ordinary skill in the art, without departing under technical solution of the present invention ambit, all
Technical solution of the present invention is made many possible variations and modification by the technology contents of available the disclosure above, or is revised as equivalent
The Equivalent embodiments of change.Therefore, every content without departing from technical solution of the present invention, according to the technical spirit pair of the present invention
Any simple modification made for any of the above embodiments, equivalent variations and modification, all still fall within the scope of technical solution of the present invention protection
In.
Claims (8)
1. can the gas spray speed pipe flow measuring device of on-line calibration, comprising: pipeline section, it is for the circulation of gas；
Spray speed is managed, and it is installed in described pipeline section, and described spray speed pipe has the first port and the second port；Differential pressure transmitter, its
Measure the pressure differential between the first port and second port of described spray speed pipe；It is characterized in that: be provided with on described pipeline section
Transparent window, the projection on tube wall of the described transparent window covers the projection on tube wall of the second port of described spray speed pipe；?
Doppler laser velocimeter it is provided with outside described pipeline section, transparent described in the laser light that described Doppler laser velocimeter sends
Form, measures the flow of the second port of described spray speed pipe.
2. gas spray speed pipe flow measuring device as claimed in claim 1, it is characterised in that: described pipeline section is at least two,
And be connected with each other.
3. gas spray speed pipe flow measuring device as claimed in claim 1, it is characterised in that: on the sidewall of described pipeline section
Pressure transmitter is installed.
4. gas spray speed pipe flow measuring device as claimed in claim 1, it is characterised in that: described pressure transmitter is close
First port of described spray speed pipe.
5. gas spray speed pipe flow measuring device as claimed in claim 1, it is characterised in that: described transparent window is double-deck
Seal structure.
6. gas spray speed pipe flow measuring device as claimed in claim 1, it is characterised in that: the diameter range of described pipeline section
It is 3～3000mm.
7. gas spray speed pipe flow measuring device as claimed in claim 1, it is characterised in that: the first end of described spray speed pipe
The diameter of mouth is more than the diameter of described second port.
8. gas spray speed pipe flow measuring device as claimed in claim 1, it is characterised in that: described pipeline section is generally circular in shape,
One in the shape such as rectangle, polygon or the combination in any of above-mentioned shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610410545.9A CN105865550B (en) | 2016-06-12 | 2016-06-12 | Gas jet velocity pipe flow measuring device capable of being calibrated on line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610410545.9A CN105865550B (en) | 2016-06-12 | 2016-06-12 | Gas jet velocity pipe flow measuring device capable of being calibrated on line |
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| Publication Number | Publication Date |
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| CN105865550A true CN105865550A (en) | 2016-08-17 |
| CN105865550B CN105865550B (en) | 2021-12-07 |
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| CN112305257A (en) * | 2019-07-29 | 2021-02-02 | 中国石油天然气股份有限公司 | Natural gas speed measuring device |
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| CN109916478A (en) * | 2019-03-26 | 2019-06-21 | 银川融神威自动化仪表厂(有限公司) | A kind of calibration of discharge coefficient, meter proof method and normal flow device |
| CN112305257A (en) * | 2019-07-29 | 2021-02-02 | 中国石油天然气股份有限公司 | Natural gas speed measuring device |
| CN112305257B (en) * | 2019-07-29 | 2022-11-04 | 中国石油天然气股份有限公司 | Natural gas speed measuring device |
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