CN104501917A - Ultra-large diameter sonic nozzle block type gas flowmeter calibrating device - Google Patents

Ultra-large diameter sonic nozzle block type gas flowmeter calibrating device Download PDF

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Publication number
CN104501917A
CN104501917A CN201510001542.5A CN201510001542A CN104501917A CN 104501917 A CN104501917 A CN 104501917A CN 201510001542 A CN201510001542 A CN 201510001542A CN 104501917 A CN104501917 A CN 104501917A
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China
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gas
sonic nozzle
header
shaped header
sonic
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CN201510001542.5A
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CN104501917B (en
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石建荣
肖晖
周轶
董芳
赵作广
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ZHENJIANG METROLOGICAL VERIFICATION TESTING CENTER
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ZHENJIANG METROLOGICAL VERIFICATION TESTING CENTER
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Abstract

The invention discloses an ultra-large diameter sonic nozzle block type gas flowmeter calibrating device. The ultra-large diameter sonic nozzle block type gas flowmeter calibrating device comprises a gas flow calibrating part located above the ground and a gas discharge part located under the ground; the gas flow calibrating part comprises a U-shaped header which is divided into front and rear two sections; a detection pipeline is connected to the front section of the U-shaped header, while sonic nozzles are connected to the rear section of the U-shaped header; the underground gas discharge part comprises a first gas pressure stabilizing tank which is provided with a plurality of outlets; each outlet is connected to a cyclic gas discharge selecting channel; the cyclic exhaust selecting channel is provided with a water discharge channel and a gas discharge channel; each sonic nozzle is connected to one first nozzle outlet header which is connected to the first gas pressure stabilizing tank. The ultra-large diameter sonic nozzle block type gas flowmeter calibrating device has the advantages that the space is effectively utilized, the noise quantity of the space of the part above the ground is reduced and the working environment is improved, and furthermore, the energy consumption is greatly reduced and the calibration result is accurate.

Description

Super large caliber sonic nozzle group formula gas meter calibrating installation
Technical field
The present invention relates to a kind of gas meter calibrating installation, especially a kind of super large caliber sonic nozzle group formula gas meter calibrating installation being applicable to the calibrating of all kinds of heavy caliber flowing meter.
Background technology
Existing calibrating installation, general is all the gas meter that calibrating bore is less, along with China " enforcement of the natural gas transmission main line that West-east Gas, " Russia's gas is gone down south " and " liquefied natural gas (LNG) disembarkation " etc. many is trans-regional, transnational and construction; gas enters high-speed development period, and increasing super large caliber gas flow instrument is applied on natural-gas transfer pipeline; The bore of natural-gas transfer pipeline is very large, the accuracy of gas meter is very large on the impact of testing result, pressure gas flowmeter with small caliber uses inconvenience, energy consumption waste is many, the calibrating of heavy caliber gas meter is long for start-up time, makes traditional pressure gas flowmeter with small caliber can not adapt to the use needs of heavy caliber gas meter.
In prior art, because sonic nozzle accuracy is high, reproducible, reliable and stable etc., feature is often selected as standard scale, domesticly have cover up to a hundred using sonic nozzle as the gas flow meter of standard scale according to investigation, on mounting means all simultaneously have selected large space formula; Adopt large space formula to install, it is unstable that nozzle installs the air-flow that causes not in place, and temperature distributing disproportionation under small flow rate, verification result out of true can be caused.
Summary of the invention
The technical problem to be solved in the present invention is to provide that a kind of vibrational power flow is reasonable, easy to use, verification result super large caliber sonic nozzle group formula gas meter calibrating installation accurately.
In order to solve the problems of the technologies described above, super large caliber sonic nozzle group formula gas meter calibrating installation of the present invention, comprises the gas flow calibrating part be positioned on the ground and the gas discharge section being positioned at underground divides; Gas flow calibrating part comprises U-shaped header, and U-shaped header is divided into two sections, front and back by center section, leading portion U-shaped header is connected with the detection pipeline that many bores are different, and back segment U-shaped header is connected with multiple sonic nozzle for examining and determine various flows value; Underground gas flow discharge section comprises a gas buffer tank, a gas buffer tank has multiple outlet, each outlet is connected in circulating exhaust selector channel respectively by a water ring vacuum pump and a steam-water separator, and circulating exhaust selector channel has for the water passing away of draining and the gas outlet channels for being vented; Each sonic nozzle is all connected on a jet expansion header, and jet expansion header is connected on a gas buffer tank.
Described sonic nozzle comprises small-sized sonic nozzle, medium-sized sonic nozzle and large-scale sonic nozzle, the gas discharge section of described underground divides and is also provided with No. two gas buffer tanks, described small-sized sonic nozzle, medium-sized sonic nozzle are also connected on No. two gas buffer tanks by No. two jet expansion headers, and described No. two gas buffer tanks are connected in circulating exhaust selector channel by No. two water ring vacuum pumps.
Described gas outlet channels has two, and wherein a gas outlet channels is positioned under ground portion, and an other gas outlet channels leads to aerial part.
The front end that described every bar detects pipeline is all connected with intake silencer.
The center section of described U-shaped header is provided with stop valve, connects the central line with standard scale between the U-shaped header of two sections, front and back; Described back segment U-shaped header is connected central outlet header with between a jet expansion header.
The invention has the advantages that:
1, owing to being provided with U-shaped header, reduce header volume, greatly reduce the space that header takies, make space obtain effective utilization;
2, this gas meter calibrating installation is divided into the gas flow calibrating part be positioned on the ground and the gas flow discharge section being positioned at underground; On the one hand, because propulsion system (water ring vacuum pump) operating noise is larger, propulsion system are arranged on underground, decrease the noise content in aerial part space, improve working environment; In addition on the one hand, reduce the mounting structure of aerial part, saved space;
3, sonic nozzle is divided into small-sized sonic nozzle, medium-sized sonic nozzle and large-scale sonic nozzle,
Small-sized sonic nozzle, medium-sized sonic nozzle also connect independently jet expansion header and independently gas buffer tank, itself and large-scale sonic nozzle detection zone are separated, different sonic nozzles and gas buffer tank can be selected according to the concrete uninterrupted that detects thus, greatly reduce energy consumption;
4, due under different temperatures, gas volume change greatly, temperature is different, easily causing error in dipping, particularly large space being detected, in order to ensure accuracy in detection during detection, need the temperature ensureing relative constancy, gas outlet channels is set to two, gas can be selected to select to be discharged on the ground or underground according to concrete testing environment, ensure that flow accuracy thus;
5, stop valve is provided with between the upper flat segments of U-shaped header two sections, the central line with standard scale is connected between two sections, the standard scale arranged plays the effect of given standard value, standard scale is combined with nozzle ingehious design, standard scale directly utilizes sonic nozzle to examine and determine at any time, for the less demanding occasion of accuracy of detection, sonic nozzle is closed and is detected by standard scale, reduce further energy consumption;
6, its overall construction design is reasonable, being exhausted the selection of passage, making verification result accurate by multiple sonic nozzle comprehensive detection for examining and determine various flows value according to real time status.
Accompanying drawing explanation
Fig. 1 is the structural representation of super large caliber sonic nozzle group formula gas meter calibrating installation of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, super large caliber sonic nozzle group formula gas meter calibrating installation of the present invention is described in further detail.
As shown in the figure, super large caliber sonic nozzle group formula gas meter calibrating installation of the present invention, comprises the gas flow calibrating part be positioned on the ground and the gas discharge section being positioned at underground divides, gas flow calibrating part comprises U-shaped header 1, U-shaped header 1 has two sections of parallel-segment and one section of linkage section be connected between parallel-segment, U-shaped header 1 is divided into two sections, front and back by the center section of linkage section, leading portion U-shaped header is connected with the detection pipeline 2 that many bores are different, every bar detects on pipeline 2 and is all provided with tong-test ammeter platform position 3, tong-test ammeter platform position 3 is for installing measured stream gauge, flowmeter for different bore detects, every bar detects pipeline 2 and is all connected on leading portion U-shaped header by corrugated tube 18, the front end that every bar detects pipeline 2 is all connected with intake silencer 15, back segment U-shaped header is connected with multiple sonic nozzle for examining and determine various flows value, underground gas flow discharge section comprises a high-power gas buffer tank of gas buffer tank 5(), a gas buffer tank 5 has multiple export pipeline, every bar export pipeline is respectively arranged with a water ring vacuum pump 6 and steam-water separator 7, every bar export pipeline is connected in circulating exhaust selector channel 8 respectively by a water ring vacuum pump (high-power water ring vacuum pump) 6 and a steam-water separator 7, circulating exhaust selector channel 8 has for the water passing away 9 of draining and the gas outlet channels 10 for being vented, said gas outlet channels 10 has two, wherein a gas outlet channels is positioned under ground portion, an other gas outlet channels leads to aerial part, each sonic nozzle 4 is all connected on a jet expansion header 11, and jet expansion header 11 is connected on a gas buffer tank 5.
Further, in the present invention, said sonic nozzle comprises small-sized sonic nozzle 4, medium-sized sonic nozzle 12 and large-scale sonic nozzle 13, the gas discharge section of underground divides and is also provided with No. two gas buffer tanks 14, small-sized sonic nozzle 4, medium-sized sonic nozzle 12 is also connected on No. two gas buffer tanks (miniwatt gas buffer tank) 14 by No. two jet expansion headers 15, No. two gas buffer tanks 14 are connected in circulating exhaust selector channel 8 by No. two water ring vacuum pumps (miniwatt water ring vacuum pump) 19 and No. two steam-water separators 20, wherein, No. two gas buffer tanks have many export pipelines, every bar export pipeline is all provided with No. two water ring vacuum pumps 19, each bar export pipeline of No. two gas buffer tanks is all pooled to No. two steam-water separators 20.
Again further, the center section of said U-shaped header 1 linkage section is provided with stop valve 16, connects the central line 18 with standard scale 17 between the U-shaped header 1 of two sections, front and back; Central outlet header 21 is connected between back segment U-shaped header with a jet expansion header 11, when needs utilize standard scale 17 to detect, all sonic nozzles are closed, stop valve 16 is closed, under propulsion system effect, air flows through exhaust box, detects pipeline, tested table, the U-shaped header of leading portion, central line 18, the U-shaped header of back segment, central outlet header 21, jet expansion header, a gas buffer tank, discharges finally by a water ring vacuum pump; Wherein, the standard scale of setting also plays the effect of given standard value, and standard scale is combined with nozzle ingehious design, standard scale directly utilizes sonic nozzle to examine and determine at any time, for the less demanding occasion of accuracy of detection, sonic nozzle is closed and is detected by standard scale, reduce further energy consumption.
Its principle of work is as follows:
As shown in Figure 1, super large caliber sonic nozzle group formula gas meter calibrating installation of the present invention, during work, under propulsion system effect, air flows through exhaust box, detects pipeline, tested table, U-shaped header, sonic nozzle, jet expansion header, a gas buffer tank, discharge finally by a water ring vacuum pump; Exhaust Gas, in circulating exhaust selector channel 8, then selects gas outlet channels as required; According to the size of calibrating flow value, also according to actual needs, the sonic nozzle combination of different model can be selected, the calibrating flow point needed for setting; The further raising realizing calibrating accuracy, meanwhile, also has an auxiliary line in the present invention,
This circuit is small-sized sonic nozzle 4, medium-sized sonic nozzle 12 is connected on No. two gas buffer tanks (miniwatt gas buffer tank) 14 by No. two jet expansion headers 15, No. two gas buffer tanks 14 are connected in circulating exhaust selector channel 8 by No. two water ring vacuum pumps (miniwatt water ring vacuum pump) 19 and No. two steam-water separators 20, it is made to examine and determine accuracy by this circuit thus higher, visible by the above-mentioned course of work, by propulsion system, the present invention can ensure that the gas of access to plant flows relatively stable and forms critical flow state in sonic nozzle throat, under stable operating mode, the gas mass flow flowing through sonic nozzle and tested table is identical, in verification process, stream pressure before industrial computer system acquisition and processing nozzle and temperature, calculate gas mean mass flux or the integrated flux of standard, and by relevant vertification regulation, its indicated value with the tested table collected is compared and calculates, tested table can be obtained in the fundamental error of this flow point and reproducibility error, thus the calibrating realized gas flow instrument, automatically calculated by calculation procedure, display and output verification result, and print.

Claims (5)

1. a super large caliber sonic nozzle group formula gas meter calibrating installation, is characterized in that: comprise the gas flow calibrating part be positioned on the ground and divide with the gas discharge section being positioned at underground; Described gas flow calibrating part comprises U-shaped header (1), U-shaped header (1) is divided into two sections, front and back by center section, leading portion U-shaped header is connected with the detection pipeline (2) that many bores are different, every bar detects on pipeline (2) and is all provided with tong-test ammeter platform position (3), and back segment U-shaped header is connected with multiple sonic nozzle for examining and determine various flows value; Described underground gas flow discharge section comprises a gas buffer tank (5), a described gas buffer tank (5) has multiple outlet, each outlet is connected in circulating exhaust selector channel (8) respectively by a water ring vacuum pump (6) and a steam-water separator (7), and described circulating exhaust selector channel (8) has for the water passing away (9) of draining and the gas outlet channels (10) for being vented; Sonic nozzle described in each (4) is all connected on one No. one jet expansion header (11), and described jet expansion header (11) is connected on a gas buffer tank (5).
2. according to super large caliber sonic nozzle group formula gas meter calibrating installation according to claim 1, it is characterized in that: described sonic nozzle comprises small-sized sonic nozzle (4), medium-sized sonic nozzle (12) and large-scale sonic nozzle (13), the gas discharge section of described underground divides and is also provided with one No. two gas buffer tanks (14), described small-sized sonic nozzle (4), medium-sized sonic nozzle (12) is also connected on No. two gas buffer tanks (14) by one No. two jet expansion headers (15), described No. two gas buffer tanks (14) are connected in circulating exhaust selector channel (8) by No. two water ring vacuum pumps.
3. according to super large caliber sonic nozzle group formula gas meter calibrating installation according to claim 1, it is characterized in that: described gas outlet channels (10) has two, wherein a gas outlet channels is positioned under ground portion, and an other gas outlet channels leads to aerial part.
4. according to super large caliber sonic nozzle group formula gas meter calibrating installation according to claim 1, it is characterized in that: the front end that described every bar detects pipeline (2) is all connected with intake silencer (15).
5. according to super large caliber sonic nozzle group formula gas meter calibrating installation according to claim 1, it is characterized in that: the center section of described U-shaped header (1) is provided with stop valve (16), between the U-shaped header (1) of two sections, front and back, connect the central line (18) with standard scale (17); Central outlet header (21) is connected between described back segment U-shaped header with a jet expansion header (11).
CN201510001542.5A 2015-01-04 2015-01-04 Super large caliber sonic nozzle group formula gas flowmeter calibrating installation Active CN104501917B (en)

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Publication number Priority date Publication date Assignee Title
CN107677342A (en) * 2016-08-01 2018-02-09 中国石油化工股份有限公司 Natural gas flowmeter verification system
CN110234965A (en) * 2017-02-10 2019-09-13 株式会社富士金 Flow determining method and flow rate-measuring device
CN110864772A (en) * 2019-11-20 2020-03-06 浙江威星智能仪表股份有限公司 Method for detecting instantaneous flow of electronic gas meter
CN110987472A (en) * 2019-12-16 2020-04-10 中国汽车工程研究院股份有限公司 Bearing seat noise processing system for NVH test of pure electric vehicle electric drive system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107677342A (en) * 2016-08-01 2018-02-09 中国石油化工股份有限公司 Natural gas flowmeter verification system
CN110234965A (en) * 2017-02-10 2019-09-13 株式会社富士金 Flow determining method and flow rate-measuring device
CN110864772A (en) * 2019-11-20 2020-03-06 浙江威星智能仪表股份有限公司 Method for detecting instantaneous flow of electronic gas meter
CN110987472A (en) * 2019-12-16 2020-04-10 中国汽车工程研究院股份有限公司 Bearing seat noise processing system for NVH test of pure electric vehicle electric drive system

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