CN103411790A - Method for taking compressed air as detection medium of CNG (Compressed Natural Gas) dispenser - Google Patents
Method for taking compressed air as detection medium of CNG (Compressed Natural Gas) dispenser Download PDFInfo
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- CN103411790A CN103411790A CN2013104059870A CN201310405987A CN103411790A CN 103411790 A CN103411790 A CN 103411790A CN 2013104059870 A CN2013104059870 A CN 2013104059870A CN 201310405987 A CN201310405987 A CN 201310405987A CN 103411790 A CN103411790 A CN 103411790A
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Abstract
The invention discloses a method for taking compressed air as a detection medium of a CNG (Compressed Natural Gas) dispenser. The method comprises the steps of horizontally placing a gas storage container on an electronic balance, and returning an indicating value of the electronic balance to zero; connecting the gas storage container with a detected gas dispenser, filling gas to the gas storage container, and closing a gas cylinder valve and a gas filling gun valve when the pressure on the gas storage container reaches to an initial pressure required by a flow area; returning indicating values of the electronic balance and the detected gas dispenser to zero; connecting an access point, filling gas to the gas storage container, and stopping filling the gas when the pressure on the gas storage container reaches to a final pressure required by the flow area; closing the gas cylinder valve and the gas filling gun valve, recording the indicating values of the electronic balance and the detected gas dispenser, and calculating an indicating value error of the measurement. According to the method disclosed by the invention, the compressed air is used as the detection medium, the medium problems of a type evaluation test and a metering performance test of the CNG dispenser in a laboratory can be effectively solved, and an important detection method is provided for factory detection and test of the CNG dispenser.
Description
Technical field
The present invention relates to a kind of autoamtic compressed gas filling machine detection method, relate in particular to a kind of pressurized air and as autoamtic compressed gas filling machine, detect the method for medium.
Background technology
In the problem that pipe flows, the impact of the various power such as flowing of fluid often is under pressure, gravity, viscous force, elastic force and surface tension, wherein with the fluid relation maximum be viscous force, the viscosity namely had by real fluid and the power that produces, what make fluid mobilely presents fluidised form-laminar flow and the turbulent flow that two species diversity are larger, and this is two kinds of distinct flow states of character.The difference of these two kinds of flow phenomenons can be embodied by the ratio of inertial force and viscous force.A kind of dimensionless number that can be used to characterize the Fluid Flow in A situation of Reynolds number, mean with Re.Utilizing Reynolds number can distinguish the mobile of fluid is laminar flow or turbulent flow, also can be used to determine object mobile suffered resistance in fluid.Judging in pipe flows is that laminar flow or the foundation of turbulent flow are dimensionless number-Reynolds numbers.The ratio of inertial force and viscous force when Reynolds number is Fluid Flow in A, the size of Reynolds number depend on flow velocity, characteristic dimension, fluid density and four parameters of kinetic viscosity.
According to channel theory, (the pipe of geometric similarity during the condition geometric similarity externally, flow is crossed the object of geometric similarity etc.), if their Reynolds number equates, fluid flow state is also geometric similarity (fluid dynamics is similar), and this similarity rules is the standardized basis of flow measurement differential pressure producer just.Visible, the reflection that Reynolds number is definite the flow characteristics of fluid, be parameter commonly used in flow measurement.
In engineering application, mobilely think that it flows is similar to what Reynolds number equated, this provides theoretical foundation for the identical medium calibrational capacity instrument of Reynolds number.So flow instrument is in calibration process, gas meter is failed to be sold at auction calmly by the reality that the method for air, liquid flowmeter water is carried out different medium usually.
At present, compressed natural gas is a kind of optimal automobile-used substitute energy, belongs to important basic energy resource industry in the national economic development, is the emphasis of first developing in the Strategy for economic development of countries in the world.As a kind of advanced person's yield-power and basic industry, it and social economy and social development have very close relationship, and not only relation the economic security problem of country, also closely related with daily life, social stability.Along with China's expanding economy, the demand of compressed natural gas constantly enlarges, and its application technology also reaches its maturity.Compressed natural gas is low with its cost, and high efficiency is pollution-free, uses the advantage of safe and convenient, just day by day demonstrates powerful development potentiality.In China, the distribution of natural gas filling station is more and more extensive, estimates approximately to have more than 7,000 gas station and nearly 30,000 s' filling machine.
But, because compressed natural gas has characteristic inflammable, explosive, easy leakage, and compressed natural gas pressure is up to 25MPa, (this test has environmental requirement to the CNG filling machine carrying out the pattern evaluation test, need to be placed on laboratory carries out) and laboratory produce while detecting inconvenient greatly, major reason due to security reason, can't be carried out with rock gas the real stream test of filling machine in laboratory.
Summary of the invention
For above-mentioned the deficiencies in the prior art part, the invention provides a kind of safe, reliably, pressurized air detects the method for medium as autoamtic compressed gas filling machine easily.
In order to solve the problems of the technologies described above, the present invention has adopted following technical scheme:
Pressurized air detects the method for medium as autoamtic compressed gas filling machine, the method comprises the steps:
1) utilize the air after air compressor will filter to compress; Then with drying tower, air is carried out to drying, will obtain high pressure dry air input high-pressure gas well and store, high-pressure gas well has two, and one of them high-pressure gas well stores the pressure-air of 25MPa, and the another one high-pressure gas well stores the pressure-air of 20MPa; Pressure-air in two high-pressure gas wells input dispense station is carried out to the pressure distribution of 3 routes, the pressure of article one route is 25MPa, and the pressure of second route is 20MPa, and the pressure of A Third Way line is 15MPa; Finally by these three pipelines respectively the gas admittance valve corresponding with three of tested filling machine connect;
2) electronic balance is placed on hard level land, and makes electronic balance ground connection;
3) electronic balance is adjusted to level, energising is preheated to the balance stipulated time;
4) air container after emptying steadily is placed on electronic balance, then the electronic balance indicating value is made zero;
5) the Application standard counterweight is verified electronic balance;
6) gas cylinder valve of air container is connected with the flow indicator by pipeline, then the flow indicator is connected with the air filling gun valve on tested filling machine by pipeline, on gas bomb, be provided with the precision pressure meter;
7) remove frost and the water on air container surface;
8) open air filling gun valve and gas cylinder valve air container is carried out to aerating, observe precision pressure meter indicating value, when the pressure on air container reaches the initial pressure of flow district requirement, close gas cylinder valve and air filling gun valve, disconnect the access point that the flow indicator is connected with air filling gun valve on tested filling machine;
9) air container steadily is placed on electronic balance, then the electronic balance indicating value is made zero;
10) by tested filling machine indicating value back to zero;
11) the air filling gun valve on connection flow indicator and tested filling machine, open gas cylinder valve and the air filling gun valve is inflated air container, observes precision pressure meter indicating value, when the air container upward pressure reaches the termination pressure of flow district requirement, stops aerating; Close gas cylinder valve and air filling gun valve, disconnect access point;
12) recorded electronic balance indicating value and tested filling machine indicating value, calculate this and measure the error of indication.
Compared with prior art, the present invention has following advantage:
1, the present invention adopts pressurized air greatly to improve as autoamtic compressed gas filling machine detection media security, and the employing compressed natural gas of having avoided effectively has risk inflammable, explosive, easy leakage; Simultaneously, adopt pressurized air as autoamtic compressed gas filling machine, to detect the method for medium, the method is convenient, fast.
2, the CNG filling machine is very convenient when carrying out pattern evaluation test (this test has environmental requirement, need to be placed on laboratory and carry out) and laboratory detection, because pressurized air is very safe in the laboratory use, therefore can carry out the real stream of filling machine and test.
3, with pressurized air, replace compressed natural gas as detecting medium, will effectively solve in laboratory to the medium difficult problem of type evaluation test and the metering performance test of autoamtic compressed gas filling machine, for factory testing and the test of CNG filling machine provides important detection method.
The accompanying drawing explanation
Fig. 1 is for producing the structural representation of gases at high pressure device;
Fig. 2 is the schematic diagram that the CNG filling machine detects.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Pressurized air detects the method for medium as autoamtic compressed gas filling machine, the method comprises the steps:
1) utilized a kind of production pressure-air device, this pressure-air device as shown in Figure 1.Utilize the air after air compressor will filter to compress; Then with drying tower, air is carried out to drying, will obtain high pressure dry air input high-pressure gas well and store, high-pressure gas well has two, one of them high-pressure gas well volume 1m
3, the pressure-air of storage 25MPa, another one high-pressure gas well volume 3m
3, the pressure-air of storage 20MPa; Pressure-air in two high-pressure gas wells input dispense station is carried out to the pressure distribution (principle is with 3 road admission lines of CNG filling machine) of 3 routes, the pressure of article one route is 25MPa; The pressure of second route is 20MPa; The pressure of A Third Way line is that the air of another high-pressure gas well in 15MPa(Fig. 1 produces after reliever); Finally by these three pipelines respectively the gas admittance valve corresponding with three of tested filling machine connect.
2) electronic balance is placed on hard level land, and makes electronic balance ground connection.
3) electronic balance is adjusted to level, energising is preheated to the balance stipulated time.
4) air container after emptying steadily is placed on electronic balance to then the electronic balance indicating value is made zero (peeling).
5) the Application standard counterweight is verified electronic balance.
6) gas cylinder valve of air container is connected with the flow indicator by pipeline, then the flow indicator is connected with the air filling gun valve on tested filling machine by pipeline, on gas bomb, be provided with the precision pressure meter; As shown in Figure 2.
7) remove frost and the water on air container surface.
8) open air filling gun valve and gas cylinder valve air container is carried out to aerating, observe precision pressure meter indicating value, when the pressure on air container reaches the initial pressure of flow district requirement, close gas cylinder valve and air filling gun valve, disconnect the access point that the flow indicator is connected with air filling gun valve on tested filling machine.
9) air container steadily is placed on electronic balance to then the electronic balance indicating value is made zero (peeling).
10) by tested filling machine indicating value back to zero.
11) the air filling gun valve on connection flow indicator and tested filling machine, open gas cylinder valve and the air filling gun valve is inflated air container, observes precision pressure meter indicating value, when the air container upward pressure reaches the termination pressure of flow district requirement, stops aerating; Close gas cylinder valve and air filling gun valve, disconnect access point.
12) recorded electronic balance indicating value and tested filling machine indicating value, calculate this and measure the error of indication.
The termination pressure that the initial pressure that the flow district requires and flow district require, this pressure size is determined by examination criteria.
Pressurized air detects the method for medium as autoamtic compressed gas filling machine, in method research, to in autoamtic compressed gas filling machine in the market, adopt the main flow meter---gases at high pressure mass flowmeter (coriolis mass flowmeters) has carried out depth profiling, obtain the important technological parameters such as discharge characteristic, characteristic dimension of mass flowmeter.
Then, with gas chromatograph, obtain composition and the density of rock gas, by medium under the calculating status of criterion, be respectively the Reynolds number of fluid in air, rock gas and the filling machine of flowing through under water, obtain the Reynolds number size under different medium.
By condition simulation, be same condition, its condition is: 20 ℃ of temperature, pressure are 101.325kPa, flow velocity 5m/s.Obtaining the calculated results is:
By upper table, the Reynolds number of air and rock gas is very close, and water its Reynolds number and rock gas under similarity condition differ very large.Gas medium and air dielectric be for the test of filling machine, and they are when detecting medium, and its pressure, temperature, pipeline etc. are close, and Reynolds number is close simultaneously, has very high Similarity of Flow.
Finally, select an autoamtic compressed gas filling machine, adopt three kinds of different detection media, obtain related data by lot of experiments, its test findings is:
Theoretical calculate and test findings shows, it is effective utilizing medium that this Reynolds number of pressure-air is close to substitute the detection medium that high-pressure natural gas is used as autoamtic compressed gas filling machine.
Finally explanation is, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to preferred embodiment, the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not breaking away from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (1)
1. pressurized air detects the method for medium as autoamtic compressed gas filling machine, it is characterized in that, the method comprises the steps:
1) utilize the air after air compressor will filter to compress; Then with drying tower, air is carried out to drying, will obtain high pressure dry air input high-pressure gas well and store, high-pressure gas well has two, and one of them high-pressure gas well stores the pressure-air of 25MPa, and the another one high-pressure gas well stores the pressure-air of 20MPa; Pressure-air in two high-pressure gas wells input dispense station is carried out to the pressure distribution of 3 routes, the pressure of article one route is 25MPa, and the pressure of second route is 20MPa, and the pressure of A Third Way line is 15MPa; Finally by these three pipelines respectively the gas admittance valve corresponding with three of tested filling machine connect;
2) electronic balance is placed on hard level land, and makes electronic balance ground connection;
3) electronic balance is adjusted to level, energising is preheated to the balance stipulated time;
4) air container after emptying steadily is placed on electronic balance, then the electronic balance indicating value is made zero;
5) the Application standard counterweight is verified electronic balance;
6) gas cylinder valve of air container is connected with the flow indicator by pipeline, then the flow indicator is connected with the air filling gun valve on tested filling machine by pipeline, on gas bomb, be provided with the precision pressure meter;
7) remove frost and the water on air container surface;
8) open air filling gun valve and gas cylinder valve air container is carried out to aerating, observe precision pressure meter indicating value, when the pressure on air container reaches the initial pressure of flow district requirement, close gas cylinder valve and air filling gun valve, disconnect the access point that the flow indicator is connected with air filling gun valve on tested filling machine;
9) air container steadily is placed on electronic balance, then the electronic balance indicating value is made zero;
10) by tested filling machine indicating value back to zero;
11) the air filling gun valve on connection flow indicator and tested filling machine, open gas cylinder valve and the air filling gun valve is inflated air container, observes precision pressure meter indicating value, when the air container upward pressure reaches the termination pressure of flow district requirement, stops aerating; Close gas cylinder valve and air filling gun valve, disconnect access point;
12) recorded electronic balance indicating value and tested filling machine indicating value, calculate this and measure the error of indication.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105486344A (en) * | 2014-10-11 | 2016-04-13 | 中国航空工业集团公司西安飞机设计研究所 | Pressure and flow testing device for oiling machine used for unmanned plane |
| CN112649560A (en) * | 2019-10-12 | 2021-04-13 | 中国石油化工股份有限公司 | Gas emission simulation system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105486344A (en) * | 2014-10-11 | 2016-04-13 | 中国航空工业集团公司西安飞机设计研究所 | Pressure and flow testing device for oiling machine used for unmanned plane |
| CN112649560A (en) * | 2019-10-12 | 2021-04-13 | 中国石油化工股份有限公司 | Gas emission simulation system |
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