CN106870936B - CNG gas dispenser quantity value traceability system - Google Patents

CNG gas dispenser quantity value traceability system Download PDF

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Publication number
CN106870936B
CN106870936B CN201710172476.7A CN201710172476A CN106870936B CN 106870936 B CN106870936 B CN 106870936B CN 201710172476 A CN201710172476 A CN 201710172476A CN 106870936 B CN106870936 B CN 106870936B
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China
Prior art keywords
cng
gas
cng dispenser
dispenser
calibration
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CN201710172476.7A
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Chinese (zh)
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CN106870936A (en
Inventor
杨焕诚
李彧
刘晓飞
王思
张敏
吴媚
方培
马丽娟
贺娜
田长青
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Inner Mongolia Institute Of Metrology Testing And Research
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Inner Mongolia Institute Of Metrology Testing And Research
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17CVESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C5/00Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
    • F17C5/06Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with compressed gases
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17CVESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00Details of vessels or of the filling or discharging of vessels
    • F17C13/02Special adaptations of indicating, measuring, or monitoring equipment
    • F17C13/025Special adaptations of indicating, measuring, or monitoring equipment having the pressure as the parameter
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17CVESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00Details of vessels or of the filling or discharging of vessels
    • F17C13/04Arrangement or mounting of valves
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17DPIPE-LINE SYSTEMS; PIPE-LINES
    • F17D3/00Arrangements for supervising or controlling working operations
    • F17D3/01Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product

Abstract

The invention discloses a CNG dispenser quantity value tracing system, which comprises: the calibration device for the CNG dispenser to be calibrated adopts natural gas as a calibration medium; the CNG dispenser quantity value tracing standard device is connected with the to-be-calibrated CNG dispenser calibrating device; the method is characterized in that: the CNG dispenser quantity value tracing standard device is connected to the pressure reducing pry and used for recovering the calibration medium. The CNG filling machine quantity value traceability system ensures that trade settlement is accurate and reliable; and the traceability system can not only develop the real-flow calibration of the CNG dispenser on-site verification device and provide the technology and method for recovering the calibration medium, but also can be used for comparing the laboratory quantity values and acquiring the superior traceability reference values.

Description

CNG gas dispenser quantity value traceability system
Technical Field
The invention relates to a traceability system, in particular to a Compressed Natural Gas (CNG) dispenser quantity traceability system taking CNG as a calibration medium.
Background
In recent years, due to the requirements of environmental protection and the factors of increasing shortage of crude oil and the like, the use of clean and green energy has become an inevitable trend of social development, natural gas as clean energy has been widely applied to automobile fuel, along with the current trend of domestic and international energy use and the use of large-scale gas transmission pipelines such as 'west gas and east gas transmission', particularly, the 'west gas and east gas transmission' project in China brings new power to the application of CNG automobiles in various cities along pipelines, and the construction of CNG gas stations and the 'oil-to-gas' change of buses and taxies are taken as key projects for urban environmental protection and urban energy structure adjustment in various cities.
Compressed Natural Gas (CNG) is low in cost and pollution, so that the CNG can be used as a fuel of modern vehicles instead of gasoline and diesel oil with violent oil price. The compressed natural gas filling machine is a measuring system for filling compressed natural gas into gas cylinder of gas automobile, it includes flow meter, electronic metering controller, auxiliary device and additional device, and is mainly used for filling gas into natural gas automobile (NGV) in CNG gas station. As trade settlement is involved, the gas dispenser is subjected to mandatory verification according to the regulations of the national metrological act. The quantity value tracing standard appliance is a CNG dispenser calibrating device. And the source tracing standard appliance of the CNG dispenser calibrating device is the CNG dispenser quantity value source tracing standard device.
The existing verification device for the CNG dispenser adopts a substitute medium calibration as a calibration medium, for example, high-pressure air is generally adopted as the calibration medium, when the verification device for the CNG dispenser needs to be calibrated, the high-pressure air is required to be adopted as a calibrated air source, the high-pressure air source is controlled during calibration, the medium flows through the calibrated CNG dispenser verification device at a rated flow rate to enter a weighing gas cylinder, air supply is stopped when the pressure of the weighing gas cylinder reaches a preset pressure value, the net mass of the high-pressure air of the weighing gas cylinder is weighed, and compared with the mass number of the high-pressure air flowing through the CNG dispenser verification device, the error value or the instrument coefficient and the uncertainty of the calibrated CNG dispenser verification device are given, and after the calibration is finished, the air in the gas cylinder can be directly discharged into the air.
In the conventional CNG dispenser calibration device adopting a substitute medium as a calibration medium, because the component difference of the calibration medium can generate a reference error inconsistent with an actual flow medium, a certain uncertainty can be brought to the CNG dispenser calibration device, and in calibration, the CNG dispenser needs to be connected to a special high-pressure gas source, the calibration method is complex, the purpose of online calibration cannot be achieved, and the reliability of calibration is influenced. Therefore, designing a CNG dispenser quantity value tracing standard device, establishing national regulations and technical specifications using natural gas (CNG) as a calibration medium, and perfecting a quantity value tracing system becomes a technical problem to be solved urgently.
Disclosure of Invention
The invention aims to establish a set of CNG dispenser quantity value traceability system, improve the detection level of CNG dispenser quantity value traceability, fill the blank in the aspect of China, and provide technical support for CNG trade supervision.
The invention provides a CNG dispenser quantity value tracing system, which comprises: the calibration device for the CNG dispenser to be calibrated adopts natural gas as a calibration medium; the CNG dispenser quantity value tracing standard device is connected with the to-be-calibrated CNG dispenser calibrating device; the CNG dispenser quantity value tracing standard device is connected to the decompression pry and used for recovering the calibration medium.
The calibration device for the CNG dispenser to be calibrated at least comprises a first air inlet valve, a first electromagnetic valve, a first pressure gauge, a mass flow meter and a first control system.
Wherein the first control system is used for controlling the mass flowmeter.
The calibration device for the CNG dispenser to be calibrated comprises a gas dispensing gun valve, and the gas dispensing gun valve is connected with an access point of a standard device.
The CNG dispenser quantity value traceability standard device at least comprises a flow indicator, a second pressure gauge, a gas cylinder valve, a gas cylinder, an electronic scale and a second control system.
When the calibration is carried out, the calibration medium in the gas source passes through the CNG dispenser calibrating device to be calibrated and the CNG dispenser quantity traceability standard device at the same time, the mass flow numerical values in the CNG dispenser calibrating device to be calibrated and the CNG dispenser quantity traceability standard device are acquired at the same time, and the CNG dispenser calibrating device to be calibrated is calibrated by comparing the mass flow measurement results of the CNG dispenser calibrating device and the CNG dispenser.
The high-accuracy electronic balance is used as a main standard device, the accuracy grade of the weighing system is superior to that of a calibrated CNG dispenser calibrating device 1/3, and the requirement of a measuring instrument quantity value transmission system table is met; by applying the domestic advanced natural gas (CNG) recovery technology, the multistage pressure regulating skid-mounted equipment ensures that the CNG is fully recovered, and the energy waste and the damage to the atmospheric ozone layer caused by the direct discharge of the CNG are reduced; the system has high pressure resistance, strong air tightness, safety, reliability, high automation degree, advanced data acquisition and processing, on-site calibration, convenience and flexibility.
According to the invention, by developing a quantity value traceability system of the CNG dispenser calibrating device, the detection capability of the quantity value traceability system of the CNG dispenser calibrating device is built, and the accuracy and reliability of trade settlement are ensured; the CNG dispenser quantity value traceability system can not only perform real-flow calibration of a CNG dispenser calibrating device and provide a calibration medium recovery technology and method, but also can be used for quantity value comparison between laboratories and acquisition of superior traceability reference values.
Drawings
Fig. 1 is a schematic structural diagram of a CNG dispenser quantity tracing system according to the present invention.
Detailed Description
To facilitate an understanding of the present invention, embodiments of the present invention will be described below with reference to the accompanying drawings, and it will be understood by those skilled in the art that the following descriptions are provided only for the purpose of illustrating the present invention and are not intended to specifically limit the scope thereof.
Fig. 1 is a schematic structural diagram of a CNG dispenser quantity tracing system according to the present invention. As shown in fig. 1, the CNG dispenser quantity traceability system at least includes: the calibration device 2 for the CNG dispenser to be calibrated, the value traceability standard device 9 for the CNG dispenser, the pressure reducing pry 17 and the like.
Referring to fig. 1, a gas source 1 is connected to a natural gas pipeline of a gas station, natural gas is used as a calibration medium, and gas used by a gas dispenser during actual operation is used as the calibration medium, so that the consistency between calibration and actual operation can be ensured, and the calibration accuracy is improved.
The gas source 1 is connected to treat calibration CNG gas dispenser calibrating device 2, should treat that calibration CNG gas dispenser calibrating device 2 includes first admission valve 3, first solenoid valve 4, first manometer 5, mass flow meter 6 and first control system 7 at least, and this first control system 7 is used for right mass flow meter 6 controls, and is right when treating that the verification CNG gas dispenser examines, need not dismantle the CNG gas dispenser from gas source 1, only need with its normal access to CNG gas dispenser quantity value standard device 9 of tracing to the source can.
Treat that calibration CNG gas filling machine calibrating device 2 has gas filling gun valve 8, usually passes through gas filling gun valve 8 is motor vehicle or other and treats gas filling device and air entrainment, when should treating calibration CNG gas filling machine calibrating device 2 and calibrate, will gas filling gun valve 8 is connected with CNG gas filling machine quantity value traceability standard device 9's access point 10, and the gas that flows out from gas filling gun valve 8 passes through access point 10 enters into in the CNG gas filling machine quantity value traceability standard device 9.
The CNG dispenser quantity traceability standard device 9 at least comprises a flow indicator 11, a second pressure gauge 12, a gas cylinder valve 13, a gas cylinder 14, an electronic balance 15 and a second control system 16, wherein the gas cylinder 14 is connected with the gas cylinder valve 13, the gas cylinder 14 is positioned on the weighing balance 15, and the weighing balance 15 is used for weighing the gas cylinder 14; gas flowing out through the gas filling gun valve 8 sequentially passes through the access point 10, the second pressure gauge 12 and the gas cylinder valve 13 to enter the gas storage cylinder 14, and the CNG filling machine calibrating device is calibrated by adopting the CNG filling machine magnitude traceability standard device 9.
For the CNG dispenser quantity value tracing standard device 9, the weighing balance 15 should ensure that the expansion uncertainty of the measurement result of the indication value error of each flow area of the CNG dispenser calibrating device is not more than 6.5 multiplied by 10-4(k ═ 2); weighing balance accuracy rating ofAnd the balance for verification or calibration of the small-flow gas dispenser calibrating device meets the following requirements: weighing 200kg at maximum, measuring the actual division value by 2g, and measuring the division by 10 g; the balance for verification or calibration of the medium-flow gas dispenser calibrating device meets the following requirements: weighing 600kg at maximum, measuring the actual division value by 10g, calibrating the division by 50g, and matching with a leveling device; wherein the maximum working pressure of the gas storage cylinder 14 is 25MPa, the rated working pressure is 20MPa, the gas storage container (gas cylinder) can bear the pressure of 37.5MPa, and the gasThe confidentiality is strong; volume of the gas storage container: when the flow gas filling machine is checked to be small, the flow gas filling machine is not smaller than 90L, and when the flow gas filling machine is checked to be medium, the flow gas filling machine is not smaller than 300L; wherein the pressure range of the pressure gauge is 0-40 MPa, and the accuracy grade is not lower than 0.4 grade; the voltage regulating range of the voltage regulator is 0-25 MPa; the gas storage bottle is lifted by a forklift, the gas storage bottle is placed on a weighing balance or is lifted from the weighing balance, and the load of the forklift can be more than 1000 kg.
For the CNG dispenser quantity tracing system, during calibration, a calibration medium in a gas source 1 simultaneously passes through the to-be-calibrated CNG dispenser calibrating device 2 and the CNG dispenser quantity tracing standard device 9, mass flow numerical values in the to-be-calibrated CNG dispenser calibrating device 2 and the CNG dispenser quantity tracing standard device 9 are simultaneously acquired, and the CNG dispenser calibrating device is calibrated by comparing flow measurement results of the two. After calibration is finished, a calibration medium (CNG) enters the urban natural gas main pipeline 18 through the low-pressure pipe network air inlet valve 28 after being subjected to pressure regulation by the pressure reducing pry 17.
The pressure reducing pry 17 at least comprises an inlet ball valve 19, a third pressure gauge 20, a first filter 21, a first pressure regulating valve 22, a fourth pressure gauge 23, a second pressure regulating valve 24, a fifth pressure gauge 25, a bleeding valve 26 and an outlet ball valve 27; the pressure reducing pry 17 is connected to the city natural gas main pipeline 18 through a low-pressure pipe network air inlet valve 28. The gas pressure at the inlet of the pressure reducing pry 17 is (20-25) MPa; after passing through the first filter 21 and the first pressure regulating valve 22, the gas in the pipeline is subjected to primary pressure reduction, and the pressure in the pipeline after pressure reduction is (7-8) MPa; after passing through the second pressure regulating valve 24, the gas pressure in the pipe becomes 2MPa after the secondary pressure reduction. The maximum working pressure of the decompression sled 1 is preferably 25MPa, the maximum withstand pressure is preferably 37.5MPa, and the lowest pressure of discharge may be preferably less than 0.5 MPa.
The entrance point and the gas bomb 14 of decompression sled 17 are connected, decompression sled 17 carries the high-pressure natural gas in CNG dispenser quantity value traceability calibrating installation's the gas bomb 14 to the city gas pipe network after the second grade decompression to finally, the civilian air supply terminal of city pipe network of influx. Alternatively, the gas after the secondary depressurization can be recycled into the pipeline of the gas source 1. The inlet end of the pressure reducing pry 17 is connected with the gas storage cylinder 14, and the outlet end of the pressure reducing pry 17 is connected with the interface of the urban network pipe. The inlet end of the pressure reducing pry is provided with a high-pressure hose, a bolt type gun head is connected into the pressure reducing pry through the high-pressure hose, and the bolt type gun head is matched with a bolt type gun seat on the weighing device. The high pressure gas is delivered to the city pipe network by reducing the gas pressure to 2MPa through the first filter 21, the first pressure regulating valve 22 and the second pressure regulating valve 24. The high-pressure gas in the gas storage cylinder becomes the gas available for the city network management through the filter and the pressure regulating valve on the pressure reducing pry. Set up the hose connection between decompression sled 17 and low pressure pipe network admission valve 28, the exit end department of decompression sled 17 is equipped with the bleeding valve, detects the gaseous natural gas concentration that the bleeding valve was discharged with hand-held type natural gas concentration detector, when natural gas concentration reached more than 95%, can transport in the pipe network. When the pipeline is not required to be conveyed into a pipeline network, the pipeline can be exhausted to the atmosphere through a relief valve on the pressure reducing pry 17. The decompression prying port is preferably DN20, and is provided with a DN20 hose, one end of the hose is connected with the outlet of the decompression pry 17, and the other end of the hose is connected to a natural gas pipeline network.
The high-accuracy electronic scale is called as a main standard device, the accuracy grade of a weighing system is superior to that of a calibrated CNG dispenser calibrating device 1/3, and the requirement of a measuring value transmission system table of the measuring instrument is met; by applying an advanced natural gas (CNG) recovery technology, the multistage pressure regulating skid-mounted equipment ensures that a calibration medium CNG is fully recovered, and the energy waste and the damage to the atmospheric ozone layer caused by the direct discharge of the CNG are reduced; the system has high pressure resistance, strong air tightness, safety, reliability, high automation degree, advanced data acquisition and processing, on-site calibration, convenience and flexibility.
The invention adopts the domestic original real flow calibration scheme and takes the actually used medium CNG of the calibrated CNG dispenser calibrating device as the measuring fluid, thereby reducing the uncertainty influence caused by the component difference of the calibration medium and improving the calibration reliability. After calibration is finished, the calibration medium (CNG) enters the gas transmission pipeline or the straight-line storage tank after being decompressed and regulated by the pressure prying device, and the discharge effect is monitored through pressure measurement, so that the relevant standard requirements are met.
According to the invention, by developing a quantity value traceability system of the CNG dispenser calibrating device, the detection capability of the quantity value traceability system of the CNG dispenser calibrating device is built, and the accuracy and reliability of trade settlement are ensured; the traceability system can not only develop the real-flow calibration of the CNG dispenser calibrating device and provide the calibration medium recovery technology and method, but also can be used for the quantity value comparison between laboratories and the acquisition of the superior traceability reference value.
It is to be understood that while the present invention has been described in conjunction with the preferred embodiments thereof, it is not intended to limit the invention to those embodiments. It will be apparent to those skilled in the art from this disclosure that many changes and modifications can be made, or equivalents modified, in the embodiments of the invention without departing from the scope of the invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.

Claims (3)

1. A CNG dispenser quantity traceability system, comprising: the calibration device for the CNG dispenser to be calibrated adopts natural gas as a calibration medium; the CNG dispenser quantity value tracing standard device is connected with the to-be-calibrated CNG dispenser calibrating device; the method is characterized in that: the calibration device for the CNG dispenser to be calibrated at least comprises a first air inlet valve, a first electromagnetic valve, a first pressure gauge, a mass flow meter and a first control system; the CNG dispenser quantity value traceability standard device at least comprises a flow indicator, a second pressure gauge, a gas cylinder valve, a gas cylinder, an electronic scale and a second control system; during calibration, enabling a calibration medium in a gas source to pass through the CNG dispenser calibrating device to be calibrated and the CNG dispenser quantity value tracing standard device at the same time, acquiring mass flow values in the CNG dispenser calibrating device to be calibrated and the CNG dispenser quantity value tracing standard device at the same time, and calibrating the CNG dispenser calibrating device to be calibrated by comparing mass flow measurement results of the CNG dispenser calibrating device to be calibrated and the CNG dispenser quantity value tracing standard device; the CNG dispenser quantity traceability standard device is connected to the decompression pry and used for recovering a calibration medium, wherein the inlet end of the decompression pry is connected with the gas storage cylinder, and the decompression pry conveys high-pressure natural gas in the gas storage cylinder of the CNG dispenser quantity traceability verification device to a city gas pipe network after secondary decompression and finally converges to a city pipe network civil gas source terminal.
2. A CNG dispenser quantity traceability system according to claim 1, wherein: the first control system is used for controlling the mass flowmeter.
3. A CNG dispenser quantity traceability system according to claim 2, wherein: the CNG dispenser calibrating device to be calibrated comprises a gas dispensing gun valve, and the gas dispensing gun valve is connected with an access point of a standard device.
CN201710172476.7A 2017-03-22 2017-03-22 CNG gas dispenser quantity value traceability system Active CN106870936B (en)

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CN110726459A (en) * 2019-09-11 2020-01-24 张家港氢云新能源研究院有限公司 Hydrogenation machine on-site verification device and method

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CN201925716U (en) * 2010-12-17 2011-08-10 中国测试技术研究院流量研究所 Metering calibration standard device for liquefied natural gas (LNG) dispenser
CN102494246B (en) * 2011-12-16 2013-06-12 重庆市计量质量检测研究院 Integrated gas dispenser detection device through standard meter method
CN103453968B (en) * 2013-09-05 2016-02-10 中国测试技术研究院流量研究所 The measurement and examination method of liquefied natural gas aerating machine
CN104180861A (en) * 2014-09-10 2014-12-03 中国测试技术研究院流量研究所 Standard device and measuring method using mass method for detecting high-pressure gas filling flow
CN105387339B (en) * 2015-10-20 2018-06-22 重庆巨创计量设备股份有限公司 CNG on-site proving methods
CN206669335U (en) * 2017-03-22 2017-11-24 内蒙古自治区计量测试研究院 A kind of CNG filling machines magnitude tracing system

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