CN108709609A - A kind of natural gas big flow is real to flow calibrating installation and method - Google Patents

A kind of natural gas big flow is real to flow calibrating installation and method Download PDF

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Publication number
CN108709609A
CN108709609A CN201810747057.6A CN201810747057A CN108709609A CN 108709609 A CN108709609 A CN 108709609A CN 201810747057 A CN201810747057 A CN 201810747057A CN 108709609 A CN108709609 A CN 108709609A
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China
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header
flowmeter
pipeline
natural gas
table position
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CN201810747057.6A
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Inventor
姚欣伟
任晓峰
王登海
孙志鹏
吴宝祥
刘晓丽
王东
白岩
张昆
白东丰
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Xian Changqing Technology Engineering Co Ltd
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Xian Changqing Technology Engineering Co Ltd
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Priority to CN201810747057.6A priority Critical patent/CN108709609A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F25/00Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
    • G01F25/10Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
    • G01F25/11Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters using a seal ball or piston in a test loop

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)

Abstract

The invention discloses a kind of natural gas big flow, stream calibrating installation and method, the device include the first header in fact(3)With the second header(11), first header(3)With air inlet(1)It is connected, the first header(3)It is connected with the detection pipeline that 4 tunnels are set up in parallel, the detection pipeline other end is connected to the second header(11);Second header(11)It is also associated with verification table position(13), the verification table position(13)It is connected to third header(12)On, third header(12)It is connected to exhaust outlet(10), wherein air inlet(1)With the second header(11)Between be also associated with small flow section detection pipeline, be equipped with rectifier successively on small flow section detection pipeline(4), turbine flowmeter(6)And rotz flowmeter(7), rectifier is equipped on the detection pipeline successively(4), ultrasonic flowmeter(5)And turbine flowmeter(6).Long-time stability of the present invention are high, improve systematic jitters and price is lower.

Description

A kind of natural gas big flow is real to flow calibrating installation and method
Technical field
The invention belongs to gas metering fields, and in particular to a kind of natural gas big flow is real to flow calibrating installation and method.
Background technology
Currently, domestic natural gas trade transaction flowmeter such as ultrasonic flowmeter, turbine flowmeter etc.(Tested flowmeter) It is all made of method of standard table(Working stamndard)Real stream compulsory verification, calibration are carried out, the systematic uncertainty of working stamndard is reachable 0.33%, standard scale is all made of 0.25 grade of high-precision gas turbine flowmeter.To the real stream compulsory verification of work grade standard scale, school Standard, the main second unit using critical flow nozzle composition in parallel carry out real stream calibrating, the systematic uncertainty of second unit 0.25% can be reached.The critical flow nozzle of second unit is then by the simple standard of mt methods(Systematic uncertainty up to 0.1% ~ 0.05%)Real stream compulsory verification is carried out, perfect transmission of quantity value system is formed:
The work grade standard of domestic natural gas measurement verification website by one or more groups of parallel connections high precision turbo-flowmeter group At per the electronic forced seal ball valve for further including all the way verification flowmeter, straight pipe, rectifier, expansion bend and respective line.Root Different work grade proving flowmeters is selected to be combined according to the required flow point of tested flowmeter, such as Fig. 2.
According to the range ability of accredited flowmeter(The range of flow of 50mm ~ 300mm is about 10 ~ 8000 m3/h), work Stage arrangement needs to select different bore turbine flowmeters and determines the number of turbines of each bore.The whirlpool of domestic work grade standard at present Flowmeters mainly select 3 250mm(130~2500 m3/h), 1 150mm(50~500 m3/h)With 1 80mm(20~2500 m3/h)Bore be combined, gamut can examine and determine 50mm ~ 300mm(10~8000m3/h)Tested flowmeter.
But problems with exists in the prior art:
1)When small flow verification, the increase that the big tube capacity between grade proving flowmeter and tested flowmeter that works can be obvious is whole The uncertainty of a verification system influences.Therefore, when work grade standard test is detected flowmeter, it is responsible for the small of small flow section calibrating The big tube capacity that there is work grade standard downstream header between bore turbine flowmeter and tested flowmeter influences.
2)According to the facilities of the current domestic grade standard that works, the turbine flowmeter conduct of a diameter of 80mm is usually selected Small-bore proving flowmeter, due to the design feature of turbine flowmeter itself, the long-time stability of small flow section are poor, i.e., long The error change amount deviation of phase is larger, and stability is relatively low.
3)It is especially more per working the purging of grade standard all the way and blowdown piping is required to that hand-operated forced seal ball-valve is arranged When group turbine flowmeter parallel connection, investment is higher.
Invention content
The object of the present invention is to provide a kind of calibrating accuracy height, long-time stability are strong and invest the day low with maintenance cost Right gas big flow flows calibrating installation and method in fact.
The present invention realizes above-mentioned purpose using following technical scheme:
The present invention provides a kind of natural gas big flow stream calibrating installation, including the first header and the second header in fact, and described first converges Pipe is connected with air inlet, and the first header is connected with the detection pipeline that multichannel is set up in parallel, and per road, the other end of detection pipeline connects To the second header, pipeline is detected per road and is equipped with rectifier, ultrasonic flowmeter and whirlpool on from the first header to the second header successively Flowmeters;Second header is also associated with verification table position, and the verification table position is connected on third header, and third header is connected to row It is also associated with small flow section detection pipeline between gas port, wherein air inlet and the second header, includes on small flow section detection pipeline Two forced seal ball valves positioned at both ends, and rectifier, turbine flow between two pressure seal ball-valves on pipeline Meter and rotz flowmeter.
Further, the first header is equipped with nitrogen purge line, and the second header is equipped with blow-down pipe.
Further, it is equipped with forced seal ball between the rectifier and the first header on the detection pipeline of the first header connection Valve also is provided with forced seal ball valve between turbine flowmeter and the second header.
Further, the detection pipeline of the first header connection is divided into 4 tunnels, and verification table position is divided into 5 tunnels, and Road downstream is set There are two third header two-way to share a third header, and the another way of verification table position is directly connect with exhaust outlet, the calibrating Platform position both ends are equipped with forced seal ball valve.
Further, the turbine flowmeter and ultrasonic flowmeter in road detection pipeline, turbine flowmeter and ultrasound in 3 tunnels Wave flowmeter diameter is 250mm, and the turbine flowmeter and ultrasonic flowmeter diameter in road are 50mm.The small flow section Turbine flowmeter and rotz flowmeter diameter on detection pipeline are 100mm.
Further, the second header is also associated with secondary standard device, and secondary standard device is connected to exhaust outlet.
Further, 5 road platform position pipe diameters of verification table position are respectively 250mm, 300mm, 200mm, 50mm, 100mm.
A kind of natural gas big flow is real to flow calibration method, when needing calibrating, is pacified according to the bore of tested flowmeter It is attached in verification table position all the way, further according to the range of tested flowmeter, opens the detection pipeline being connected with the first header and small One or more pipeline in flow section detection pipeline is examined and determine, and the one of flowmeter is detected subsequently into being installed in verification table position Road, after drain into gas outlet through third header or directly drain into gas outlet through verification table position
The invention has the advantages that:
(1)Small flow section detection pipeline detects pipeline independently of other 4 tunnels, and upstream directly takes gas, downstream and second from air inlet Header outlet is connected, and can either participate in the calibration operation that heavy caliber is detected flowmeter, it is small can be also individually for diameter 100mm or less Bore be detected flowmeter examined and determine, reduce small-caliber flow meter calibrating when intermediate tube capacity, individually calibrating diameter 100mm with The timing of lower small mouth run-off can reduce tube capacity about 2.54m3, improve systematic uncertainty.
(2)1 rotz flowmeter is selected in small flow section detection pipeline(100mm)Replace original turbine flowmeter (80mm), 5 ~ 400 m of range of flow3/ h, range is wider, and long-time stability are more preferable, and corresponding verification flowmeter selects turbine flow Gauge(100mm);Turbine flowmeter is selected in remaining 4 tunnel detection pipeline(3 250mm, 1 150mm), range of flow is respectively 130~2500 m3/ h and 50 ~ 500 m3/ h, corresponding verification flowmeter select ultrasonic flowmeter(3 250mm, 1 150mm);Total flow ranging from 10 ~ 8000 m3/ h disclosure satisfy that the gamut of 50mm ~ 300mm flowmeters is cautious.
(3)Simplify each pipeline and be vented flow setting, reduce 50mm forced seals valve, each 5 of shut-off valve, simplifies each pipeline note Nitrogen flow setting reduces 50mm forced seals valve, each 4 of shut-off valve, simplifies each pipeline telescopic device setting, cancels expansion bend 5, Reduce about 1,260,000 yuan of investment.It is changed to that nitrogen purge line all the way is arranged only at the first header, is arranged all the way at the second header Blow-down pipe.
Description of the drawings
Fig. 1 is schematic diagram of the present invention;
Fig. 2 is that traditional natural gas big flow flows calibrating installation flow diagram in fact.
1, air inlet in figure;2, nitrogen purge line;3, the first header;4, rectifier;5, ultrasonic flowmeter;6, turbine Flowmeter;7, rotz flowmeter;8, blow-down pipe;9, secondary standard device;10, exhaust outlet;11, the second header;13, verification table Position;14, forced seal ball valve;15, expansion bend.
Specific implementation mode
【Embodiment 1】
As shown in Figure 1, including the first header 3 and the second header 11, first header 3 is connected with air inlet 1, the first header 3 It is connected with the detection pipeline that multichannel is set up in parallel, the other end of detection pipeline is connected to the second header 11 per road, per road detection pipe Line is equipped with rectifier 4, ultrasonic flowmeter 5 and turbine flowmeter 6 successively from first the 3 to the second header of header 11;Second converges Pipe 11 is also associated with verification table position 13, and the verification table position 13 is connected on third header 12, and third header 12 is connected to exhaust outlet 10, it is characterised in that:Small flow section detection pipeline, small flow section inspection are wherein also associated between air inlet 1 and the second header 11 Include two forced seal ball valves 14 positioned at both ends on test tube line, and is forced between seal ball-valve 14 on pipeline positioned at two Rectifier 4, turbine flowmeter 6 and rotz flowmeter 7.
Forced seal ball valve 14, inspection are equipped on the detection pipeline of first header 3 connection between rectifier 4 and the first header 3 Forced seal ball valve 14 is equipped between turbine flowmeter 6 and the second header 11 on test tube line.
Detect turbine flowmeter 6 and supersonic flow in 5,3 tunnel of turbine flowmeter 6 and ultrasonic flowmeter in pipeline in 4 tunnels 5 diameter of gauge is 250mm, and the turbine flowmeter 6 and 5 diameter of ultrasonic flowmeter in 1 tunnel are 150mm.
Turbine flowmeter 6 and 7 diameter of rotz flowmeter on small flow section detection pipeline are 100mm.
The detection pipeline of first header 3 connection is divided into 4 tunnels.
Wherein the first header 3, the second header 11,4 tunnels detection pipeline arranged side by side and small flow section detection pipeline nominal are work Make grade standard set-up, gas enters work grade standard set-up from connecing in gas port 1, subsequently into verification table position 13, verification table position 13 for installing tested flowmeter, and final gas drains into exhaust outlet 10 from verification table position 13, final to be discharged.
And small flow section detection pipeline is independent outside 4 tunnels detection pipeline, directly connects with air inlet 1 and the second header 11 It connects, the calibration operation that heavy caliber is detected flowmeter can either be participated in this way, can also be individually for the small-bore tested streams of 100mm or less Gauge is examined and determine, and is being individually for that tube capacity can be reduced about when the small-bore tested flowmeters of 100mm or less are examined and determine 2.54m3, improve systematic uncertainty.
In multichannel detection pipeline arranged side by side, the turbine flowmeter 6 on pipeline is used as work grade standard scale, wherein 3 diameters The range of flow of 250mm, 1 150mm, the two are 130 ~ 2500 m respectively3/ h and 50 ~ 500 m3/h.Ultrasonic flow on pipeline Meter 5 is used as verifying flowmeter, wherein 3 diameters 250mm, 1 150mm, total flow ranging from 10 ~ 8000 m3/ h, disclosure satisfy that The gamut of 50mm ~ 300mm flowmeters is cautious.Wherein the identical turbine flowmeter 6 of diameter and ultrasonic flowmeter 5 are located at same Road.
In addition as shown in Fig. 2, domestic device all uses turbine flowmeter 6 to be used as work grade standard scale, but osculum at present 6 long-time stability of turbine flowmeter of diameter are poor.
By comparison, turbine belongs to velocity flowmeter.First, blade and axis there are frictional force, small flow section some When below critical point, gas is influenced very big by frictional force, and there are certain journeys for the flow velocity of the blade rotational speed and real fluid that measure The difference of degree, measurement accuracy are poor;Second, velocity flowmeter is larger by Reynolds number effect(Re=ρvd/µ), when bore d is smaller When, gas Reynolds number is smaller, and fluidised form tends to laminar flow, and balance and repdocutbility are poor, and the long-time stability of flowmeter are poor.
Waist wheel belongs to volumetric flowmeter.It is influenced by frictional force and Reynolds number smaller when small flow section, is had better Long-time stability, annual flow error variable quantity are no more than 0.05%, 100mm rotz flowmeters in 10 ~ 400m3/ h range models Error in enclosing is small(-0.15~+0.25%), linearity height;Stability is good, is conducive to the amendment of flowmeter error.
Therefore, grade standard scale that works in independent small flow section detection pipeline uses rotz flowmeter 7, a diameter of 100mm, 5 ~ 400 m of range of flow3/ h, range is wider, and long-time stability are more preferable, and annual flow error variable quantity is no more than 0.05%.The turbine flowmeter 6 verified flowmeter and use 100mm on circuit.
【Embodiment 2】
As shown in Figure 1, the first header 3 is equipped with nitrogen purge line 2, the second header 11 is equipped with blow-down pipe 8.
As shown in Fig. 2, forced seal should be arranged in the nitrogen purge line 2 and blow-down pipe 8 that are connected with detection pipeline Ball valve 14 ensures zero leakage, and the general ball valve of output investment ratio of forced seal ball valve 14 is expensive, therefore this practicality is by nitrogen sparge tube Line 2 is separately positioned on blow-down pipe 8 on the first header 3 and the second header 11, avoids nitrogen purge line 2 and blow-down pipe 8 with the forced seal ball valve 14 per detection pipe line all the way.Cost is reduced while purging and emptying function may be implemented.
At the same time, because infrequently being dismantled after proving flowmeter installation, present invention eliminates per on detection pipe line all the way Expansion bend 15.
On the whole, flow setting is vented by each pipeline of simplification, reduces 50mm forced seals valve, each 5 of shut-off valve, letter Change each pipeline note nitrogen flow setting, reduce 50mm forced seals valve, each 4 of shut-off valve, simplifies each pipeline telescopic device setting, cancel Expansion bend 5 reduces about 1,260,000 yuan of investment.
【Embodiment 3】
As shown in Figure 1, verification table position 13 is divided into 5 tunnels, wherein 4 tunnel downstreams are set, there are two 12 two-way of third header to share one the The another way of three headers 12, verification table position is directly connect with exhaust outlet 10, and 13 both ends of verification table position are equipped with forced seal Ball valve 14.
5 road platform position pipe diameters of verification table position 13 are respectively 250mm, 300mm, 200mm, 150mm, 100mm.
Wherein verification table position 13 shares 5 tunnels, the tested flowmeter for installing different bores.According to the model of tested flowmeter It encloses, needs several flow points examined and determine, corresponding work grade standard of opening to need the pipe combined according to the requirement selection of vertification regulation Road.The selection specifically combined is as shown in table 1.
Table is selected in the work grade proving flowmeter combination of table 1
Such as shown in serial number 1, when tested flowmeter bore is 50mm ~ 100mm, the measurement range of test point is(10~250)m3/ When h, only enables the small flow section that standard scale bore is 100mm and detect pipeline.
As shown in serial number 2, when tested flowmeter bore is 80mm ~ 100mm, the measurement range of test point is(250~400) m3When/h, enable in 4 tunnels detection pipeline, 6 bore of standard scale, that is, turbine flowmeter is that road of 150mm.
As shown in serial number 7, when tested flowmeter bore is 150mm ~ 200mm, the measurement range of test point is(1600~ 3200)m3It when/h, enables in detection pipeline, 3 road standard scales, that is, 6 bore of turbine flowmeter is 2 tunnels in 250mm.
【Embodiment 4】
As shown in Figure 1, the second header 11 is also associated with secondary standard device 9, secondary standard device 9 is connected to exhaust outlet 10.
Second header 11 is also connected to existing secondary standard device 9, convenient to carry out secondary standard detection when needed, Secondary standard is discharged after having detected from exhaust outlet 10.
In conclusion when needing calibrating, one in verification table position 13 is attached it to according to the bore of tested flowmeter The detection pipeline being connected with the first header 3 and the detection of small flow section are opened in road further according to the range of tested flowmeter according to table 1 One or more pipeline in pipeline is examined and determine, and is detected flowmeter all the way subsequently into being installed in verification table position 13, later Gas outlet 10 is drained into through third header 12 or directly drains into gas outlet 10 through verification table position 13.
When calibrating, natural gas enters from air inlet 1, according to table 1, when needing the work grade table using 100mm, natural gas Directly enter in verification table position 13 through small flow section detection pipeline, detecting the rotz flowmeter 7 in pipeline by small flow section carries out Calibrating, turbine flowmeter 6 is verified, and at this time as shown in serial number 1 in table 1, is detected flowmeter bore 80-100mm, natural gas is not Through the second header 11, that pipeline of a diameter of 100mm in verification table position 13 is directly entered by small flow section detection pipeline, then Natural gas is discharged from gas outlet 10.If as shown in serial number 4, when being detected flowmeter bore 150-200mm, natural gas is through small flow section It detects pipeline to enter in the second header 11, is detected that road of flowmeter subsequently into being placed in verification table position 13, enters third later Then header 12 is discharged through exhaust outlet 10.
When needing the work grade table using 150mm or 250mm, natural gas enters the first header 3 through air inlet 1, according to Table 1 opens one or more in 4 tunnels calibrating pipeline, is examined and determine by turbine flowmeter 6 therein, ultrasonic flowmeter 5 is made To verify, natural gas enters back into that installed in verification table position 13 and be detected flowmeter by entering the second header 11 behind corresponding road Road enters third header 12 and is then discharged through exhaust outlet 10 later.

Claims (8)

1. a kind of natural gas big flow stream calibrating installation, including the first header in fact(3)With the second header(11), first header (3)With air inlet(1)It is connected, the first header(3)It is connected with the detection pipeline that multichannel is set up in parallel, detection pipeline is another per road End is connected to the second header(11), pipeline is detected per road from the first header(3)To the second header(11)On successively be equipped with rectifier (4), ultrasonic flowmeter(5)And turbine flowmeter(6);Second header(11)It is also associated with verification table position(13), the calibrating Platform position(13)It is connected to third header(12)On, third header(12)It is connected to exhaust outlet(10), it is characterised in that:Wherein air inlet (1)With the second header(11)Between be also associated with small flow section detection pipeline, include being located at both ends on small flow section detection pipeline Two forced seal ball valves(14), and positioned at two pressure seal ball-valves(14)Between rectifier on pipeline(4), turbine flow Gauge(6)And rotz flowmeter(7).
2. a kind of natural gas big flow according to claim 1 flows calibrating installation in fact, it is characterised in that:First header (3)It is equipped with nitrogen purge line(2), the second header(11)It is equipped with blow-down pipe(8).
3. a kind of natural gas big flow according to claim 1 flows calibrating installation in fact, it is characterised in that:First header (3)Rectifier on the detection pipeline of connection(4)With the first header(3)Between be equipped with forced seal ball valve(14), turbine flow Meter(6)With the second header(11)Between also be provided with forced seal ball valve(14).
4. a kind of natural gas big flow according to claim 1 flows calibrating installation in fact, it is characterised in that:First header (3)The detection pipeline of connection is divided into 4 tunnels, verification table position(13)5 tunnels are divided into, there are two third headers wherein 4 tunnel downstreams are set (12)Two-way shares a third header(12), the another way of verification table position is directly and exhaust outlet(10)Connection, the verification table Position(13)Both ends are equipped with forced seal ball valve(14).
5. a kind of natural gas big flow according to claim 1 flows calibrating installation in fact, it is characterised in that:The 4 tunnel detection Turbine flowmeter in pipeline(6)And ultrasonic flowmeter(5), turbine flowmeter in 3 tunnels(6)And ultrasonic flowmeter(5)Directly Diameter is 250mm, the turbine flowmeter in 1 tunnel(6)And ultrasonic flowmeter(5)Diameter is 150mm;The small flow section inspection Turbine flowmeter on test tube line(6)And rotz flowmeter(7)Diameter is 100mm.
6. a kind of natural gas big flow according to claim 1 flows calibrating installation in fact, it is characterised in that:Second header (11)It is also associated with secondary standard device(9), secondary standard device(9)It is connected to exhaust outlet(10).
7. a kind of natural gas big flow according to claim 4 flows calibrating installation in fact, it is characterised in that:The verification table position (13)5 road platform position pipe diameters be respectively 250mm, 300mm, 200mm, 150mm, 100mm.
8. a kind of natural gas big flow flows calibration method in fact, it is characterised in that:When needing calibrating, according to the mouth of tested flowmeter Diameter attaches it in verification table position all the way, further according to the range of tested flowmeter, opens the detection being connected with the first header One or more pipeline in pipeline and small flow section detection pipeline is examined and determine, and stream is detected subsequently into being installed in verification table position Gauge all the way, after drain into gas outlet through third header or directly drain into gas outlet through verification table position.
CN201810747057.6A 2018-07-09 2018-07-09 A kind of natural gas big flow is real to flow calibrating installation and method Pending CN108709609A (en)

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CN108007534A (en) * 2017-12-30 2018-05-08 西安长庆科技工程有限责任公司 A kind of natural gas big flow flows verification system in fact
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CN110864770A (en) * 2019-11-20 2020-03-06 威海坤科流量仪表股份有限公司 Gas waist wheel starting flow testing equipment and testing method thereof
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CN108007534A (en) * 2017-12-30 2018-05-08 西安长庆科技工程有限责任公司 A kind of natural gas big flow flows verification system in fact
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CN109855708A (en) * 2019-03-22 2019-06-07 广东省环境监测中心 A kind of flow inspection, calibrating installation and method
CN109855708B (en) * 2019-03-22 2024-03-26 广东省环境监测中心 Flow checking and calibrating device and method
CN110864770A (en) * 2019-11-20 2020-03-06 威海坤科流量仪表股份有限公司 Gas waist wheel starting flow testing equipment and testing method thereof
CN113155243A (en) * 2021-04-30 2021-07-23 北京极达测控设备技术有限公司 High-pressure natural gas mobile verification vehicle
CN113155243B (en) * 2021-04-30 2021-10-15 北京极达测控设备技术有限公司 High-pressure natural gas mobile verification vehicle
RU2780983C1 (en) * 2022-04-21 2022-10-04 Публичное Акционерное Общество "Газпром Автоматизация" Monoblock single-line gas measuring station on ultrasonic flow transducers of large diameter with a verification unit at the place of operation

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