CN108007534B - Natural gas high-flow real-flow verification system - Google Patents
Natural gas high-flow real-flow verification system Download PDFInfo
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- CN108007534B CN108007534B CN201711486926.6A CN201711486926A CN108007534B CN 108007534 B CN108007534 B CN 108007534B CN 201711486926 A CN201711486926 A CN 201711486926A CN 108007534 B CN108007534 B CN 108007534B
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- 238000012795 verification Methods 0.000 title claims abstract description 148
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 239000003345 natural gas Substances 0.000 title claims abstract description 18
- 230000001105 regulatory effect Effects 0.000 claims abstract description 76
- 238000001914 filtration Methods 0.000 claims abstract description 20
- 238000007789 sealing Methods 0.000 claims description 50
- 230000000087 stabilizing effect Effects 0.000 claims description 20
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 19
- 239000007789 gas Substances 0.000 claims description 15
- 238000010926 purge Methods 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 9
- 238000000034 method Methods 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 8
- 238000000926 separation method Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 6
- 230000007774 longterm Effects 0.000 description 5
- 238000005259 measurement Methods 0.000 description 4
- 230000004075 alteration Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000013022 venting Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- OWZREIFADZCYQD-NSHGMRRFSA-N deltamethrin Chemical compound CC1(C)[C@@H](C=C(Br)Br)[C@H]1C(=O)O[C@H](C#N)C1=CC=CC(OC=2C=CC=CC=2)=C1 OWZREIFADZCYQD-NSHGMRRFSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- 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
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Sampling And Sample Adjustment (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention discloses a natural gas high-flow real-flow verification system, which comprises an air inlet, a filtering and separating device, a pressure-stabilizing regulating valve group, a bypass flow regulating valve group and an air outlet which are sequentially connected, wherein the lower end of the pressure-stabilizing regulating valve group is respectively connected with the bypass flow regulating valve group, a working level standard device and a high-precision verification station, the working level standard device comprises 4 paths of turbines and 1 path of waist wheels, the upper end and the lower end of the 4 paths of turbines are provided with collecting pipes, the waist wheel meters are independently arranged outside the collecting pipes, and the working level standard device can be connected with the verification station and also can be connected with a secondary standard device; the secondary standard device is provided with three inlets, a first inlet of the secondary standard device is connected with the working level standard device and the high-precision verification station, a second inlet of the secondary standard device and a third inlet of the secondary standard device are connected with the verification station, and the lower ends of the verification station and the secondary standard device can be connected with the main flow regulating valve group. The optimized verification system is adopted, the verification process is flexible and various, and the verification function is more perfect.
Description
Technical Field
The invention belongs to a real-flow verification process system, and particularly relates to a natural gas high-flow real-flow verification system.
Background
At present, a domestic natural gas high-flow real-flow verification process system forms a mature typical mode, and mainly comprises an air inlet, a filtering and separating device, a pressure stabilizing regulating valve group, a station crossing regulating valve group, a main flow regulating valve group, a bypass flow regulating valve group, a traditional verification station, a high-precision verification station, a traditional working level standard device, a traditional secondary standard device, a traditional mobile verification vehicle interface, an air outlet, a nitrogen purging pipeline, a venting pipeline and the like as shown in fig. 2.
The traditional working level standard device consists of turbine flowmeters (with different flow ranges), wherein a forced sealing ball valve, a nitrogen purging pipeline and a venting pipeline are arranged at the lower end of each road, a telescopic device and the like are arranged at the lower end of each road, and the combination modes of the turbine flowmeters in different roads are selected by opening the forced sealing ball valves in different roads; the traditional secondary standard device consists of critical flow Venturi nozzles (different critical flow rates), wherein the upper end and the lower end are respectively provided with a header pipe, the lower end of each road is provided with a forced sealing ball valve, the lower end is provided with a telescopic device and the like, and the combination mode of the critical flow Venturi nozzles in different paths is selected by opening the forced sealing ball valves in different paths.
During normal operation, natural gas is taken from a supported sub-delivery station or pipe network, natural gas with the maximum verification flow required by the sub-delivery station is shunted out through a cross-station regulating valve group, enters a verification area after overpressure protection, filtering separation and pressure stabilization regulation, and natural gas with different gas flows are sequentially shunted out through the cooperation of a main flow regulating valve group and a bypass flow regulating valve group according to the requirements of verification regulations and pass through a traditional standard device (secondary/working level) and a tested flowmeter, so that the following verification functions are realized:
A. working level standard verification of the flowmeter to be tested:
air inlet (air inlet), filtering and separating device, pressure stabilizing and regulating valve group, traditional working level standard device, traditional verification station, main flow regulating valve group and air outlet (air exhaust);
B. secondary standard certification working level standard:
air inlet (air inlet), filtering and separating device, pressure stabilizing and regulating valve group, traditional working level standard device, traditional secondary standard device, main flow regulating valve group and air outlet (air exhaust);
C. secondary standard verification of the inspected flowmeter:
air inlet (air inlet), filtering and separating device, pressure stabilizing regulating valve group, high-precision verification bench, traditional secondary standard device, main flow regulating valve group and air outlet (air exhaust);
D. secondary standard calibration mobile verification vehicle:
air inlet (air inlet), filtering separation device, pressure stabilizing regulating valve group, traditional mobile verification vehicle interface, traditional secondary standard device, main flow regulating valve group and air outlet (air exhaust).
The traditional natural gas high-flow real-flow verification system has the advantages that the verification range is smaller, accurate verification cannot be realized on small flow, the number of pipelines and forced sealing ball valves in the system is large, the cost of the whole system is high, the pipe capacity of a verification pipeline is large, and the uncertainty of system measurement in the detection process is low.
Disclosure of Invention
The invention aims to provide a natural gas high-flow real-flow verification system, which optimizes the traditional natural gas high-flow real-flow verification system, increases verification functions, reduces the number of valves and pipelines, reduces the pipe capacity of a verification pipeline, improves verification accuracy, reduces investment and reasonably utilizes the existing occupied land.
In order to achieve the above purpose, the present invention is realized by adopting the following technical scheme.
The utility model provides a natural gas large-traffic real-current verification system, includes air inlet, filtration separator, steady voltage regulating valve group, bypass flow regulating valve group and the gas vent that connects gradually, including the regulating valve group that stands more between air inlet and gas vent, including verification bench, high accuracy verification bench, working level standard device, secondary standard device, main flow regulating valve group and removal verification car interface, its characterized in that: the lower end of the pressure stabilizing regulating valve group is connected with a bypass flow regulating valve group, and is also connected with a working level standard device and a high-precision verification station respectively, the working level standard device comprises 4 paths of turbine flow meters and 1 path of roots flowmeter which are arranged in parallel, the upper end and the lower end of the 4 paths of turbine flow meters are provided with first collecting pipes, the roots flowmeter is independently arranged outside the first collecting pipes, the upper end of the roots flowmeter is connected with the lower end of the pressure stabilizing regulating valve group through a common electric valve, the lower end of the roots flowmeter is connected with a forced sealing ball valve, and the working level standard device can be connected with the verification station and a secondary standard device through the first collecting pipes at the lower end of the turbine flow meters and the forced sealing ball valve at the lower end of the roots flowmeter; the lower end of the verification station is connected with the upper end of the main flow regulating valve group, and the lower end of the main flow regulating valve group is connected with the exhaust port; the secondary standard device is provided with three inlets, namely a secondary standard device first inlet, a secondary standard device second inlet and a secondary standard device third inlet, wherein the upper end of the secondary standard device first inlet can be connected with the lower ends of the working level standard device and the high-precision verification station, the upper ends of the secondary standard device second inlet and the secondary standard device third inlet can be connected with the lower ends of the verification station, and the secondary standard device can be connected with the upper end of the main flow regulating valve group through a fifth manifold at the lower end.
The diameter of 3 in 4 turbine flowmeter of working level standard devices is 250mm, and the diameter of 1 is 150mm, and the diameter of 1 way roots flowmeter is 100mm, be equipped with ordinary motorised valve between turbine flowmeter and its upper end first manifold, be equipped with the forced seal ball valve between turbine flowmeter and its lower extreme first manifold, be equipped with 1 way nitrogen gas purge pipeline on the upper end first manifold of working level standard devices, be equipped with the drain line on the lower extreme first manifold.
The secondary standard device comprises a critical flow venturi nozzle, a third collecting pipe and a fourth collecting pipe at the upper end and a fifth collecting pipe at the lower end, wherein the lower end of the third collecting pipe is provided with 4 paths of parallel critical flow venturi nozzles, the lower end of the fourth collecting pipe can be provided with 11 paths of parallel critical flow venturi nozzles, and the lower ends of all the critical flow venturi nozzles are connected with the fifth collecting pipe; the secondary standard device first inlet and the secondary standard device second inlet are provided on a third manifold, and the secondary standard device third inlet is provided on a fourth manifold.
The diameter of the 4 paths of critical flow venturi nozzles connected with the third collecting pipe in the secondary standard device is 50mm, the diameter of the 11 paths of critical flow venturi nozzles connected with the fourth collecting pipe is 100mm, the two pipe orifices of the third collecting pipe and the fourth collecting pipe are connected, a forced sealing ball valve is arranged in the middle, forced sealing ball valves are arranged between all the critical flow venturi nozzles and the third collecting pipe, a forced sealing ball valve is also arranged between all the critical flow venturi nozzles and the fourth collecting pipe, and a forced sealing ball valve is arranged at the upper end of a first inlet of the secondary standard device.
The verification bench is divided into 5 paths, wherein the lower end of 4 paths is provided with two second collecting pipes, the two paths share 1 second collecting pipe, the lower end of the second collecting pipe is connected with the upper end of the main flow regulating valve group, and the lower end of the other 1 path of verification bench is directly connected with the upper end of the main flow regulating valve group through a forced sealing ball valve.
The pipeline diameters of the 5 paths of stations of the verification station are 250mm, 300mm, 200mm, 150mm and 100mm respectively, the upper end and the lower end of the 5 paths of stations are provided with forced sealing ball valves respectively, and 4 paths of forced sealing ball valves are arranged between the upper end and the lower end collecting pipes and the stations.
The movable verification vehicle comprises a movable verification vehicle body, a movable verification vehicle and a movable verification vehicle, wherein the movable verification vehicle body is provided with two interfaces, the movable verification vehicle body is provided with a first interface and a second interface, the first interface of the movable verification vehicle body is detachably connected to the upper end and the lower end of a high-precision verification station through an S-shaped bent pipe, and the second interface of the movable verification vehicle body is detachably connected to a station with the diameter of 250mm in the verification station through the S-shaped bent pipe.
The invention has the beneficial effects that: the optimized verification system is adopted to realize the functions of secondary standard verification working level standard, secondary standard verification detected flowmeter, secondary standard verification mobile vehicle, small Guan Rong control of secondary standard verification small flow, working level standard verification detected flowmeter and working level standard calibration mobile vehicle, and the verification flow is flexible and various, and the verification function is more perfect.
1. The working level standard device adopts the Buddha's wheel flowmeter as a small-caliber standard table, so that the long-term stability of the verification of a small flow section is improved (the annual flow error variation is not more than 0.05 percent); the device simplifies the emptying flow setting of each pipeline, reduces 5 forced sealing valves and stop valves of 50mm, simplifies the nitrogen injection flow setting of each pipeline, reduces 4 forced sealing valves and stop valves of 50mm, simplifies the setting of retractors of each pipeline, cancels 5 retractors, and reduces the investment by about 126 ten thousand yuan.
2. After the upper end of the calibration bench is combined with the lower end of the working level standard device, the diameter of the pipe 2 is reduced by 400mm, the bench diameter is reduced by 150mm and 200mm, and the pipe capacity is reduced by 0.8m 3 The pipe capacity is reduced by 1.12m at the positions of 250mm and 300mm 3 。
3. 2 movable verification vehicle interfaces are arranged, an S bent pipe temporary access system is adopted, the pipeline switching process is simplified, 1 forced sealing valve of 250mm is added, 1 forced sealing valve of 100mm, 5 forced sealing valves of 300mm and 1 forced sealing valve of 400mm are reduced, two telescopic devices of 250mm are reduced, and the investment is reduced by about 238 ten thousand yuan; the setting of the second interface of the mobile verification vehicle increases the function of the working level standard calibration mobile vehicle.
4. The secondary standard upper header is divided into two headers with a size of 1.3m, so that the tube volume in small flow detection is reduced 3 The uncertainty of system measurement in detection is improved.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1 is a process flow diagram of the present invention;
fig. 2 is a flow chart of a conventional natural gas high-flow real-flow verification system.
In the figure: 1. an air inlet; 2. a filtering and separating device; 3. a pressure stabilizing regulating valve group; 4. a station-crossing regulating valve group; 5. a working level standard device; 51. a conventional working-level standard device; 6. calibrating the bench position; 61. a traditional verification station; 7. calibrating the bench position with high precision; 8. a traditional mobile verification vehicle interface; 81. moving a first interface of the verification vehicle; 82. moving a second interface of the verification vehicle; 9. secondary standard means; 91. a conventional secondary standard device; 9-1. Secondary standard device first inlet; 9-2. A secondary standard device second inlet; 9-3, a third inlet of the secondary standard device; 10. a main flow regulating valve group; 11. a bypass flow regulating valve block; 12. a nitrogen purge line; 13. a vent line; 14. a turbine flowmeter; 15. a roots wheel flowmeter; 16. a common electric valve; 17. forced sealing ball valve; 18. a critical flow venturi nozzle; 191. a first manifold; 192. a second manifold; 193. a third manifold; 194. a fourth header; 195. a fifth manifold; 20. an exhaust port; 21. a telescopic device.
Detailed Description
Example 1:
the embodiment provides a natural gas large-traffic real-flow verification system, as shown in fig. 1, including air inlet 1, filtration separator 2, steady voltage regulating valve group 3, bypass flow regulating valve group 11 and gas vent 20 that connect gradually, including the station regulating valve group 4 that crosses between air inlet 1 and gas vent 20, including verification bench 6, high accuracy verification bench 7, working level standard device 5, secondary standard device 9, mainstream flow regulating valve group 10 and removal verification car interface, its characterized in that: the lower end of the pressure stabilizing regulating valve group 3 is connected with a bypass flow regulating valve group 11, a working level standard device 5 and a high-precision verification station 7 respectively, the working level standard device 5 comprises 4 paths of turbine flow meters 14 and 1 path of roots flow meters 15 which are arranged in parallel, first collecting pipes 191 are arranged at the upper end and the lower end of the 4 paths of turbine flow meters 14, the roots flow meters 15 are independently arranged outside the first collecting pipes 191, the upper end of the roots flow meters are connected with the lower end of the pressure stabilizing regulating valve group 3 through a common electric valve 16, the lower end of the roots flow meters 15 are connected with a forced sealing ball valve 17, and the working level standard device 5 can be connected with the verification station 6 and the secondary standard device 9 through the first collecting pipes 191 at the lower end of the turbine flow meters 14 and the forced sealing ball valve 17 at the lower end of the roots flow meters 15; the lower end of the verification station 6 is connected with the upper end of the main flow regulating valve group 10, and the lower end of the main flow regulating valve group 10 is connected with the exhaust port 20; the secondary standard device 9 is provided with three inlets, namely a secondary standard device first inlet 9-1, a secondary standard device second inlet 9-2 and a secondary standard device third inlet 9-3, wherein the upper end of the secondary standard device first inlet 9-1 can be connected with the lower ends of the working level standard device 5 and the high-precision verification station 7, the upper ends of the secondary standard device second inlet 9-2 and the secondary standard device third inlet 9-3 can be connected with the lower end of the verification station 6, and the secondary standard device 9 can be connected with the upper end of the main flow regulating valve group 10 through a fifth collecting pipe 195 at the lower end.
The optimized verification system is adopted to realize the functions of secondary standard verification working level standard, secondary standard verification detected flowmeter, secondary standard verification mobile vehicle, small Guan Rong control of secondary standard verification small flow, working level standard verification detected flowmeter and working level standard calibration mobile vehicle, and the verification flow is flexible and various, and the verification function is more perfect. The following are provided:
A. working level standard verification of the flowmeter to be tested:
an air inlet 1 (air inlet), a filtering and separating device 2, a pressure stabilizing regulating valve group 3, a working level standard device 5, a verification station 6, a main flow regulating valve group 10 and an air outlet 20 (air exhaust);
B. work level standard calibration mobile vehicle:
the method comprises the steps of an air inlet 1 (air inlet), a filtering and separating device 2, a pressure stabilizing regulating valve group 3, a working level standard device 5, a mobile verification vehicle second interface 82, a main flow regulating valve group 10 and an air outlet 20 (air exhaust);
C. secondary standard calibration mobile vehicle:
air inlet 1 (air inlet), filtering separation device 2, pressure stabilizing regulating valve group 3, first interface 81 of mobile verification vehicle, secondary standard device 9, main flow regulating valve group 10 and air outlet 20 (air exhaust);
D. secondary standard certification working level standard:
a secondary standard verification working level standard small flow section:
air inlet 1 (air inlet), filtering separation device 2, pressure stabilizing regulating valve group 3, working level standard device 5, secondary standard device first inlet 9-1, secondary standard device 9 (left 4-path nozzle combination), main flow regulating valve group 10 and air outlet 20 (air exhaust);
b secondary standard certification working level standard large flow section:
air inlet 1 (air inlet), filtering separation device 2, pressure stabilizing regulating valve group 3, working level standard device 5, secondary standard device first inlet 9-1, secondary standard device 9, main flow regulating valve group 10 and air outlet 20 (air exhaust);
E. secondary standard verification of the inspected flowmeter:
a secondary standard verification small-caliber inspected flowmeter:
air inlet 1 (air inlet), filtering separation device 2, pressure stabilizing regulating valve group 3, buton flowmeter 15, verification station (100 mm station), secondary standard device second inlet 9-2, secondary standard device 9 (left 4-channel nozzle combination), and air outlet 20 (air exhaust);
b secondary standard verification of a large-caliber detected flowmeter:
air inlet 1 (air inlet), filtering separation device 2, pressure stabilizing regulating valve group 3, turbine flowmeter 14 (diameter 150 mm), verification station (150 mm station), secondary standard device third inlet 9-3, secondary standard device 9 (right 11-channel nozzle combination), and air outlet 20 (air exhaust);
c secondary standard verification large-caliber detected flowmeter:
the method comprises the steps of air inlet 1 (air inlet), filtering and separating device 2, pressure stabilizing and regulating valve group 3, high-precision verification station 7, first inlet 9-1 of secondary standard device, secondary standard device 9 and air outlet 20 (air exhaust).
Example 2:
in this embodiment, the working-stage calibration device 5 is specifically described based on embodiment 1, as shown in fig. 1, 3 of 4 turbine flowmeters 14 of the working-stage calibration device 5 have a diameter of 250mm,1 of the 4 turbine flowmeters 14 has a diameter of 150mm,1 of the 1-way roots flowmeter 15 has a diameter of 100mm, a common electric valve 16 is disposed between the turbine flowmeter 14 and the upper end first manifold 191 thereof, a forced seal ball valve 17 is disposed between the turbine flowmeter 14 and the lower end first manifold 191 thereof, a 1-way nitrogen purge line 12 is disposed on the upper end first manifold 191 of the working-stage calibration device 5, and a vent line 13 is disposed on the lower end first manifold 191.
As shown in FIG. 2, a conventional naturalThe working level standard device 5 in the gas large-flow real-flow verification system generally adopts the turbine flowmeter 14 as a working level standard table, but the turbine flowmeter 14 with small caliber has poor long-term stability. The turbine belongs to a speed type flowmeter, friction exists between a turbine blade and a shaft, when the temperature of the gas is below a certain critical point of a small flow section, the gas is greatly affected by the friction, the measured rotating speed of the blade is different from the flow speed of the actual fluid to a certain extent, and the measurement accuracy is poor; and the velocity type flowmeter is greatly affected by the Reynolds number, re=ρvd/[ mu ] is smaller when the caliber d is smaller, the flow state tends to be laminar, the balance and the reproducibility are poor, and the long-term stability of the flowmeter is poor. The waist wheel belongs to a positive displacement flowmeter, is less influenced by friction force and Reynolds number in a small flow section, has better long-term stability, has the annual flow error variation not more than 0.05%, and has the flow error variation of 100mm of the waist wheel 15 of 10-400 m 3 The error in the range of the per-h measuring range is small and 0.15 to +0.25%, the linearity is high, the stability is good, and the correction of the error of the flowmeter is facilitated. Therefore, the present invention selects the 100mm Royal flow meter 15 as the small-bore working level standard flow meter.
Since standard flow meters are not removed as often as they are installed, the present invention eliminates each lower end jack 21. Because the emptying and nitrogen purging pipeline 12 connected with the verification pipeline is provided with the forced sealing ball valve 17 to ensure zero leakage, and the investment of the forced sealing ball valve 17 is higher than that of a common ball valve, the invention cancels the manual forced sealing valve, the manual valve and the corresponding pipelines of each path of emptying and purging, only the nitrogen purging pipeline 12 is arranged at the upper end collecting pipe, and the emptying pipeline 13 is arranged at the lower end collecting pipe, and the purging and emptying functions can be realized.
In a word, the working level standard device 5 adopts the Butox flowmeter 15 as a small-caliber standard table, so that the annual flow error variation of the long-term stability of the verification of a small flow section is improved by not more than 0.05%; the device simplifies the emptying flow setting of each pipeline, reduces 5 forced sealing valves and stop valves of 50mm, simplifies the nitrogen injection flow setting of each pipeline, reduces 4 forced sealing valves and stop valves of 50mm, simplifies the setting of each pipeline expansion device 21, cancels five expansion devices 21 and reduces the investment by about 126 ten thousand yuan.
Example 3:
in this embodiment, the secondary standard device 9 is specifically described based on embodiment 1, as shown in fig. 1, where the secondary standard device 9 includes a critical flow venturi nozzle 18, a third collecting pipe 193 at the upper end, a fourth collecting pipe 194 and a fifth collecting pipe 195 at the lower end, where 4 parallel critical flow venturi nozzles 18 are disposed at the lower end of the third collecting pipe 193, 11 parallel critical flow venturi nozzles 18 may be disposed at the lower end of the fourth collecting pipe 194, and all the lower ends of the critical flow venturi nozzles 18 are connected to the fifth collecting pipe 195; the secondary standard first inlet 9-1 and the secondary standard second inlet 9-2 are provided on a third manifold 193 and the secondary standard third inlet 9-3 is provided on a fourth manifold 194.
The diameter of the 4 paths of critical flow venturi nozzles 18 connected with the third collecting pipe 193 in the secondary standard device 9 is 50mm, the diameter of the 11 paths of critical flow venturi nozzles 18 connected with the fourth collecting pipe 194 is 100mm, the two pipe orifices of the third collecting pipe 193 and the fourth collecting pipe 194 are connected, a forced sealing ball valve 17 is arranged in the middle, forced sealing ball valves 17 are arranged between all the critical flow venturi nozzles 18 and the third collecting pipe 193, forced sealing ball valves 17 are also arranged between all the critical flow venturi nozzles 18 and the fourth collecting pipe 194, and a forced sealing ball valve 17 is arranged at the upper end of the first inlet 9-1 of the secondary standard device.
The secondary standard device 9 is used as a core standard device, and no matter the standard of the verification working level or the flow meter to be detected, the condition that the whole upper end collecting pipe is required to be filled with small-flow gas exists, so that the pipe capacity between the detected meter and the standard meter is increased to a certain extent, and the uncertainty of the system is reduced. Therefore, the invention divides the upper header into a large header and a small header, wherein 4 paths of 50mm10 m 3 /h、20 m 3 /h、40 m 3 /h、80m 3 And/h is connected to a small third header 193, 11 paths 100mm160 m 3 /h、320 m 3 /h, 9-way 400m 3 And/h is connected to a large fourth manifold 194.
1) When the standard flow meter group is tested or the flow meter of 250mm-300mm is tested, test gas enters the device through the first inlet 9-1 of the secondary standard device, passes through the opened critical flow Venturi nozzles 18 with different paths, and is discharged from the outlet to the lower end.
2) When the flow meter of 50mm-100mm is detected, a valve outside the first inlet 9-1 of the secondary standard device is closed, the detected gas enters the device through the second inlet 9-2 of the secondary standard device, and is discharged to the lower end from the outlet through the opened critical flow Venturi nozzles 18 with different paths.
3) When the 150mm flow meter is detected, a valve outside the first inlet 9-1 of the secondary standard device and a 300mm forced sealing valve of the upper header pipe are closed, the detection gas enters the device through the third inlet 9-3 of the secondary standard device, and is discharged to the lower end from the outlet through the opened critical flow Venturi nozzles 18 with different paths.
In short, the upper header of the secondary standard device 9 is divided into two headers with a size of 1.3m, so that the tube volume for small flow detection is reduced 3 The uncertainty of system measurement in detection is improved.
Example 4:
in this embodiment, the verification stand 6 is specifically described based on embodiment 1, as shown in fig. 1, the verification stand 6 is divided into 5 paths, wherein two second collecting pipes 192 are provided at the lower end of the 4 paths, the two paths share 1 second collecting pipe 192, the lower end of the second collecting pipe 192 is connected with the upper end of the main flow regulating valve group 10, and the lower end of the other 1 path of the verification stand 6 is directly connected with the upper end of the main flow regulating valve group 10 through a forced sealing ball valve 17.
The pipeline diameters of the 5 paths of stations of the verification station 6 are 250mm, 300mm, 200mm, 150mm and 100mm respectively, the upper end and the lower end of the 5 paths of stations are provided with forced sealing ball valves 17 respectively, and 4 paths of forced sealing ball valves 17 are arranged between the upper end and the lower end of the pipe assembly and the station.
The tube volume between the verification station 6 and the working level standard belongs to an effective Guan Rong in the verification process, and the uncertainty of a verification system is improved as small as possible, so that the invention cancels the traditional mode such as arranging a small collecting tube at the upper end of a detected flowmeter with adjacent caliber in fig. 2, and the collecting tubes at the upper ends of all the verification stations 6 are shared with the collecting tube at the lower end of the working level. After the upper end collecting pipe of the verification station 6 is combined with the lower end collecting pipe of the working level, the diameter of the collecting pipe 2 with the diameter of 400mm is reduced, and the diameter of the collecting pipe 2 is 150mm and 200mmTable position reducing tube capacity 0.8m 3 The pipe capacity is reduced by 1.12m at the positions of 250mm and 300mm 3 。
Example 5:
the embodiment specifically describes the movable verification vehicle interfaces based on embodiment 1, as shown in fig. 1, the movable verification vehicle interfaces are two, namely a movable verification vehicle first interface 81 and a movable verification vehicle second interface 82, the movable verification vehicle first interface 81 is detachably connected to the upper and lower end ports of the high-precision verification station 7 through an S-shaped bent pipe, and the movable verification vehicle second interface 82 is also detachably connected to the station with the diameter of 250mm in the verification station 6 through an S-shaped bent pipe.
The two movable verification vehicle interfaces are all connected with the system by adopting the S-bend temporary connection system, so that the pipeline switching process is simplified, 1 forced sealing valve of 250mm is added, 1 forced sealing valve of 100mm, 5 forced sealing valves of 300mm and 1 forced sealing valve of 400mm are reduced, two telescopic devices of 250mm are reduced, and the investment is reduced by about 238 ten thousand yuan; the provision of the mobile verification vehicle second interface 82 increases the functionality of the work level standard calibration mobile vehicle.
The foregoing examples are merely illustrative of the present invention and are not intended to limit the scope of the present invention, and all designs that are the same or similar to the present invention are within the scope of the present invention.
In addition, various modifications and alterations of this invention may be made by those skilled in the art without departing from the spirit and scope of this invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (4)
1. The utility model provides a natural gas large-traffic real-flow verification system, including air inlet (1), filtering separator (2), steady voltage regulating valve group (3), cross station regulating valve group (4), work level standard device (5), verification station (6), high accuracy verification station (7), remove verification car interface, secondary standard device (9), main flow regulating valve group (10), bypass flow regulating valve group (11) and gas vent (20), wherein air inlet (1), filtering separator (2), steady voltage regulating valve group (3), bypass flow regulating valve group (11) and gas vent (20) are connected gradually through the pipeline, cross station regulating valve group (4) establish on another pipeline between air inlet (1) and gas vent (20), its characterized in that: the lower end of the pressure stabilizing regulating valve group (3) is connected with a bypass flow regulating valve group (11), a working level standard device (5) and a high-precision verification station (7) respectively, the working level standard device (5) comprises 4 paths of turbine flow meters (14) and 1 path of lobed-wheel flow meters (15) which are arranged in parallel, first collecting pipes (191) are arranged at the upper end and the lower end of the 4 paths of turbine flow meters (14), the lobed-wheel flow meters (15) are independently arranged outside the first collecting pipes (191), the upper ends of the lobed-wheel flow meters are connected with the lower end of the pressure stabilizing regulating valve group (3) through a common electric valve (16), the lower ends of the lobed-wheel flow meters (15) are connected with a forced sealing ball valve (17), and the working level standard device (5) can be connected with the station (6) and a secondary standard device (9) through the first collecting pipes (191) at the lower ends of the turbine flow meters (14) and the forced sealing ball valve (17) at the lower ends of the lobed-wheel flow meters (15). The lower end of the verification station (6) is connected with the upper end of the main flow regulating valve group (10), and the lower end of the main flow regulating valve group (10) is connected with the exhaust port (20); the secondary standard device (9) is provided with three inlets, namely a secondary standard device first inlet (9-1), a secondary standard device second inlet (9-2) and a secondary standard device third inlet (9-3), the upper end of the secondary standard device first inlet (9-1) can be connected with the lower ends of the working level standard device (5) and the high-precision verification station (7), the upper ends of the secondary standard device second inlet (9-2) and the secondary standard device third inlet (9-3) can be connected with the lower end of the verification station (6), and the secondary standard device (9) can be connected with the upper end of the main flow regulating valve group (10) through a fifth manifold (195) at the lower end;
3 turbine flow meters (14) of the working level standard device (5) have the diameter of 250mm,1 turbine flow meter (14) has the diameter of 150mm,1 turbine flow meter (15) has the diameter of 100mm, a common electric valve (16) is arranged between the turbine flow meter (14) and a first collecting pipe (191) at the upper end of the turbine flow meter, a forced sealing ball valve (17) is arranged between the turbine flow meter (14) and the first collecting pipe (191) at the lower end of the turbine flow meter, 1 nitrogen purging pipeline (12) is arranged on the first collecting pipe (191) at the upper end of the working level standard device (5), and a vent pipeline (13) is arranged on the first collecting pipe (191) at the lower end of the working level standard device;
the secondary standard device (9) comprises a critical flow venturi nozzle (18), a third collecting pipe (193) at the upper end, a fourth collecting pipe (194) and a fifth collecting pipe (195) at the lower end, wherein 4 parallel critical flow venturi nozzles (18) are arranged at the lower end of the third collecting pipe (193), 11 parallel critical flow venturi nozzles (18) can be arranged at the lower end of the fourth collecting pipe (194), and the lower ends of all the critical flow venturi nozzles (18) are connected with the fifth collecting pipe (195); the first inlet (9-1) of the secondary standard device and the second inlet (9-2) of the secondary standard device are arranged on a third collecting pipe (193), and the third inlet (9-3) of the secondary standard device is arranged on a fourth collecting pipe (194);
the diameter of the 4 paths of critical flow venturi nozzles (18) connected with the third collecting pipe (193) in the secondary standard device (9) is 50mm, the diameter of the 11 paths of critical flow venturi nozzles (18) connected with the fourth collecting pipe (194) is 100mm, the two pipe orifices of the third collecting pipe (193) and the fourth collecting pipe (194) are connected, a forced sealing ball valve (17) is arranged in the middle, forced sealing ball valves (17) are arranged between all the critical flow venturi nozzles (18) and the third collecting pipe (193), forced sealing ball valves (17) are also arranged between all the critical flow venturi nozzles (18) and the fourth collecting pipe (194), and a forced sealing ball valve (17) is arranged at the upper end of the first inlet (9-1) of the secondary standard device.
2. A natural gas high flow real flow verification system according to claim 1, wherein: the verification station (6) is divided into 5 paths, wherein the lower end of 4 paths is provided with two second collecting pipes (192), the two paths share 1 second collecting pipe (192), the lower end of the second collecting pipe (192) is connected with the upper end of the main flow regulating valve group (10), and the lower end of the other 1 path of the verification station (6) is directly connected with the upper end of the main flow regulating valve group (10) through a forced sealing ball valve (17).
3. A natural gas high flow real flow verification system according to claim 2, wherein: the pipeline diameters of the 5 paths of stations of the verification station (6) are 250mm, 300mm, 200mm, 150mm and 100mm respectively, the upper end and the lower end of the 5 paths of stations are provided with forced sealing ball valves (17) respectively, and the 4 paths of forced sealing ball valves (17) are arranged between the upper end and the lower end of the header pipe and the station.
4. A natural gas high flow real flow verification system according to claim 1, wherein: the movable verification vehicle comprises two movable verification vehicle interfaces, namely a movable verification vehicle first interface (81) and a movable verification vehicle second interface (82), wherein the movable verification vehicle first interface (81) is detachably connected to the upper end and the lower end of a high-precision verification station (7) through an S-shaped bent pipe, and the movable verification vehicle second interface (82) is detachably connected to a station with the diameter of 250mm in the verification station (6) through the S-shaped bent pipe.
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| CN108709609A (en) * | 2018-07-09 | 2018-10-26 | 西安长庆科技工程有限责任公司 | A kind of natural gas big flow is real to flow calibrating installation and method |
| CN114001803B (en) * | 2021-09-09 | 2024-02-27 | 国家管网集团浙江省天然气管网有限公司 | Bypass type natural gas flow automatic verification control system and control method thereof |
| CN113916329A (en) * | 2021-11-03 | 2022-01-11 | 国家石油天然气管网集团有限公司 | Natural gas flowmeter calibrating device and method based on neural network |
| CN114577312B (en) * | 2022-05-06 | 2022-07-29 | 南京深度系统工程有限公司 | Loop detection device containing multistage standards and online calibration method of standard |
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