CN107063401A - Liquefied natural gas aerating machine calibration method and system - Google Patents
Liquefied natural gas aerating machine calibration method and system Download PDFInfo
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- CN107063401A CN107063401A CN201611062075.8A CN201611062075A CN107063401A CN 107063401 A CN107063401 A CN 107063401A CN 201611062075 A CN201611062075 A CN 201611062075A CN 107063401 A CN107063401 A CN 107063401A
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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
- G01F25/13—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters using a reference counter
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/05—Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
- G05B19/058—Safety, monitoring
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/10—Plc systems
- G05B2219/16—Plc to applications
- G05B2219/163—Domotique, domestic, home control, automation, smart, intelligent house
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Fluid Mechanics (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
This application discloses a kind of liquefied natural gas aerating machine calibration method and system, the system is connected with filling machine to be checked, and including：Proving flowmeter, it is connected with the aerating delivery outlet of filling machine to be checked, the aerating output flow for detecting filling machine to be checked, and outputting standard flow count value；Flow verification collector, it is connected with filling machine to be checked and the proving flowmeter, instructed for sending " calibrating starts " and " calibrating terminates " to filling machine to be checked and the proving flowmeter, and read from filling machine to be checked and the proving flowmeter flow count value and the normal flow count value of filling machine to be checked respectively.The present invention is for calibrating installation, and compact conformation, maneuverability is safe and reliable, improves LNG filling machine on-line metering calibration accuracies, is important calibration equipment during filling machine use, has great influence to the interests of trade transaction both sides.
Description
Technical field
The present invention relates to the technical field of liquefied natural gas (LNG) aerating equipment calibrating, and in particular to liquefied natural gas adds
Mechanism of qi calibration method and system.
Background technology
Liquefied natural gas (abbreviation LNG) be changed by natural gas a kind of cleaning, the efficient energy.Fired in all cleanings
In material, natural gas is so that its application technology is ripe, safe and reliable, economically feasible and be considered as at present most by world many countries and expert
Suitable alternative fuel for cars.China is to possess one of most country of clean energy vehicle in the world.
However, the LNG gas stations of these operations cause LNG up to the present also without more scientific follow-up calibration method
Filling machine metering accuracy is greatly reduced, with potential metering risk.LNG as block trade commodity, be related to trade settlement and
Security protection, it is necessary to solve the accurate of value and trace to the source problem, this is not only directly connected to the interests of trade both sides, and according to
Country《Measurement Law》Regulation, the LNG filling machines for trade transaction should include mandatory administration scope in accordance with the law, it is therefore necessary to carry out
Examined and determine in type evaluation, first calibrating, follow-up calibrating and use.
The content of the invention
The purpose of the present invention is that there is provided a kind of liquefied natural gas (LNG) filling machine calibrating side in view of the shortcomings of the prior art
Method and system.Calibration method application specific calibrating interface synchronization obtains LNG filling machine data, and the system calibration precision reaches
1%.Present invention also offers a kind of portable verification system, such as vehicular verification system, its internal structure is compact, by anti-
Quick-fried lithium electric installation is powered to standard calibrating device, explosion-proof control device.The present invention is logical using wireless Wifi encryptions and computer orientation
Letter, can be such that calibrating data are accurately and quickly transmitted between calibrating installation and computer without wiring.
Embodiments in accordance with the present invention are there is provided a kind of liquefied natural gas aerating machine verification system, itself and filling machine to be checked
Connection, it is characterised in that the liquefied natural gas aerating machine verification system includes：Proving flowmeter, itself and the aerating to be checked
The aerating delivery outlet connection of machine, the aerating output flow for detecting the filling machine to be checked, and outputting standard flow count value；
Flow verification collector, it is connected with the filling machine to be checked and the proving flowmeter, for filling machine to be checked and
The proving flowmeter sends " calibrating starts " and " calibrating terminates " and instructed, and from the filling machine to be checked and the normal stream
Gauge reads the flow count value and the normal flow count value of filling machine to be checked respectively.
Embodiments in accordance with the present invention, the proving flowmeter includes titer multi-phase flowmeter and Standard Gases multi-phase flowmeter,
It is connected by fieldbus with the flow verification collector respectively.
Embodiments in accordance with the present invention, the liquefied natural gas aerating machine verification system also includes Programmable logical controller
Device, pressure transmitter, the programmable logic controller (PLC) are connected with display screen, interchanger, radio communication converter, guard grating,
The pressure transmitter is connected to the guard grating by analog input loop.
Embodiments in accordance with the present invention, the flow verification collector is connected with the controlling device of filling machine to be checked, the meter
Control device is connected with the flowmeter of filling machine to be checked.
There is provided the liquefaction realized by above-mentioned liquefied natural gas aerating machine verification system is natural for embodiments in accordance with the present invention
Gas filling machine calibration method, comprises the following steps：Step 1, verification system start after calibrating, and the flow verification collector is simultaneously
" taking present flow rate count value " instruction is sent to proving flowmeter and filling machine to be checked, the filling machine to be checked starts simultaneously at aerating
Output；Step 2, the proving flowmeter are after described " taking present flow rate count value " instruction is received, by its current time
Count value MB1 is sent to the flow verification collector；Step 3, the filling machine to be checked described " take current flow meter receiving
After numerical value " instruction, the count value MJ1 at its current time is sent to the flow verification collector；It is step 4, described to be checked
Filling machine continues aerating output；Step 5, the filling machine to be checked stop aerating output, also, the flow verification collector is same
When send " taking present flow rate count value " instruction to proving flowmeter and filling machine to be checked；Step 6, the proving flowmeter are being received
To after described " taking present flow rate count value " instruction, the count value MB2 at its current time is sent to the flow verification and adopted
Storage；Step 7, the filling machine to be checked are after described " taking present flow rate count value " instruction is received, by its current time
Count value MJ2 is sent to the flow verification collector.
The present invention is had the advantage that with beneficial effect：
1st, the on-line metering calibrating to liquefied natural gas (LNG) filling machine is realized, 1% calibration accuracy, precision is reached
National metrological verification regulations regulation is exceeded.
2nd, liquid phase flow verification and the complete machine calibrating to filling machine have been respectively completed, efficiently, verification result is real for calibration method
Existing dual backup；
3rd, the present invention is for calibrating installation, and compact conformation, maneuverability is safe and reliable.The present invention improves LNG aeratings
Machine on-line metering calibration accuracy, is important calibration equipment during filling machine use, has weight to the interests of trade transaction both sides
Big influence.
Brief description of the drawings
Fig. 1 is to be shown according to liquefied natural gas (LNG) the filling machine calibration method of embodiments of the invention and the structure of system
It is intended to；
Fig. 2 is liquefied natural gas (LNG) the filling machine calibration method and the principle frame of system according to embodiments of the invention
Figure；
Fig. 3 is the pipeline of liquefied natural gas (LNG) filling machine liquid phase flow verification method according to embodiments of the invention
Connection figure；
Fig. 4 is to be connected according to the pipeline of liquefied natural gas (LNG) filling machine complete machine calibration method of embodiments of the invention
Figure；
Fig. 5 is the instruction sequencing figure of liquefied natural gas (LNG) filling machine calibration method according to embodiments of the invention；
Fig. 6 is the data sampling time sequence of liquefied natural gas (LNG) filling machine calibration method according to embodiments of the invention
Figure.
Embodiment
Below, the implementation of technical scheme is described in further detail with reference to accompanying drawing.
Although it will be appreciated by those of skill in the art that the following description is related to many of embodiment for the present invention
Ins and outs, but be only for for illustrate the present invention principle example and do not mean that any limitation.The present invention can be applicable
Occasion outside different from ins and outs exemplified below, principle and spirit without departing from the present invention.
, may pair can be in description in this manual in addition, miscellaneous in order to avoid being limited to the description of this specification
The portion of techniques details obtained in prior art data has carried out the processing such as omission, simplification, accommodation, this technology for this area
It will be understood by for personnel, and this does not interfere with the open adequacy of this specification.
Specific embodiment is described in detail below in conjunction with the accompanying drawings.
Embodiments in accordance with the present invention are there is provided a kind of liquefied natural gas (LNG) filling machine verification system, and it mainly includes
Three layers below：Bottom is instrument layer, including standard calibrating device is responsible for docking with scene filling machine；Middle level is field control layer,
Including explosion-proof control device, it is responsible for system data acquisition control, system coordination, logic execution etc.；Upper strata is management level, is responsible for system
Reason under the overall leadership, system monitoring, continuous data are integrated, report generation.
The standard calibrating device includes low temperature mass flowmenter, pressure transmitter；The low temperature mass flowmenter passes through
RS485 communication loops are connected to the flow verification collector；The pressure transmitter is connected to by analog input loop
The guard grating.
As further scheme of the invention, liquefied natural gas (LNG) the filling machine calibration method includes liquid phase flow
Calibrating and complete machine calibrating, the explosion-proof control device are encrypted and compunlcation by wireless Wifi；The colorful display screen is furnished with
External memorizer stores verification result.
Fig. 1 is to be shown according to liquefied natural gas (LNG) the filling machine calibration method of embodiments of the invention and the structure of system
It is intended to.
As shown in figure 1, liquefied natural gas (LNG) filling machine verification system in the present embodiment, explosion-proof control device includes
PLC, flow verification collector；
PLC has following functions：Calibrating point Row control；Auxiliary parameter (temperature, pressure) is gathered；Man-machine interface
Interactive controlling；Upper and lower computer interactive communication is controlled.The verifying process flow control of device is completed by PLC.PLC is occupy
The intermediate layer of whole LNG filling machine measurement verification systems, is system bottom execution, monitoring device and top level computer man-machine interface
Between information bridge, effect be receive top level computer calibrating set and verification parameters, including LNG filling machines manufacturer and
Its acquisition mode that communicates is set, calibrating flow point is set, verifying process flow (liquid phase verifying process flow, complete machine verifying process flow) is set, stream
Measure stability is set, calibrating number of times is set etc..
The flow verification collector is used to carry out proving flowmeter flow signal acquisition, LNG filling machine aerating amount signals
Collection, communication logic control.
Fig. 2 is liquefied natural gas (LNG) the filling machine calibration method and the principle frame of system according to embodiments of the invention
Figure.
As shown in Fig. 2 the explosion-proof control device includes PLC (controller), flow verification collector, the PLC connections
Chromatic colour display screen, flow verification collector, interchanger, radio communication converter, guard grating.For example, the PLC passes through
RS232 communication loops are connected to the flow verification collector, the colorful display screen, are connected to by ethernet communication loop
The interchanger, the radio communication converter；The PLC is also connected to the guard grating by rigid line.
Specifically, guard grating is used to carry out insulation blocking to system, and colorful display screen is as human-computer interaction interface, by data
It is shown on interface, Ethernet wire signal is converted to wireless Wifi signals by radio communication converter, data is carried out with computer
Interaction.
Fig. 3 is the pipeline of liquefied natural gas (LNG) filling machine liquid phase flow verification method according to embodiments of the invention
Connection figure.
Reference picture 3, present invention calibrating operating process is described as follows.
Liquefied natural gas aerating machine calibrating car is docked at by LNG filling machines, anti-static device is connected.According to Fig. 3 pipe
Line is docked with live filling machine, and liquid phase flow verification is carried out first.
Before calibrating, filling machine and calibrating installation will carry out pre-cooling cycle flow.By filling machine and calibrating installation using fast
Dress mode is mutually concatenated, and the air filling gun of filling machine is inserted on the liquid feeding rifle interface of calibrating installation, the connection liquid phase interface of calibrating installation
Air filling gun be inserted on the circulation port of filling machine；Filling machine pre-cooling cycle is opened, the LNG stream body that calibrating installation is shown during which is observed
State parameter (flow, temperature, density etc.), while adjusting calibrating installation liquid phase pipeline end installs flow control valve adjustment stream
Amount.When the flow value for observing circulation process meets 32kg/min to range of flow between 80kg/min, and filling machine and calibrating
When device liquidus temperature differs ± 2 DEG C, stop pre-cooling cycle flow.
Complete after pre-cooling cycle flow, into liquid phase flow verifying process flow.The air filling gun of filling machine is inserted into calibrating installation
On liquid feeding rifle interface, the air filling gun of the connection liquid phase interface of calibrating installation is inserted on the circulation port of filling machine, and filling machine is not connected to
Return line.In the case of pre-cooling cycle flow state is constant, filling machine starts aerating flow, the inspection of calibrating installation subsequent start-up
It is fixed.Direct circulation aerating completes at least three not good liquor multi-phase flowmeters and individually examined and determine.
Fig. 4 is to be connected according to the pipeline of liquefied natural gas (LNG) filling machine complete machine calibration method of embodiments of the invention
Figure.Reference picture 4, illustrates the complete machine calibrating of next step below.
After liquid phase flow verifying process flow is completed, into complete machine verifying process flow.The air filling gun of filling machine is inserted into calibrating installation
Liquid feeding rifle interface on, the return-air rifle of filling machine is inserted on the return-air rifle interface of calibrating installation；The connection liquid phase of calibrating installation connects
The air filling gun of mouth is inserted into the aerating mouthful of air container (for example, motorbus), the return-air of the connection gas phase interface of calibrating installation
Rifle is inserted on the gas returning port of the air container；Filling machine starts aerating flow, the calibrating of calibrating installation subsequent start-up.Aerating terminates
Afterwards, calibrating installation gathers filling machine cumulative flow value and calibrating installation cumulative flow value simultaneously.Then result of calculation, generates metering
Form.
Illustrate referring to Fig. 5 and 6：How embodiments in accordance with the present invention, realize the raising of measurement verification precision.
Fig. 5 is the instruction sequencing figure of liquefied natural gas (LNG) filling machine calibration method according to embodiments of the invention；Figure
6 be the data sampling time sequence figure of liquefied natural gas (LNG) filling machine calibration method according to embodiments of the invention.
Standard calibrating device of the present invention is standard transfer device, mainly assign high-performance, high accuracy flowmeter as mark
Quasi- flow measurement utensil is used to examine and determine other flowmeters.
Standard calibrating device is exactly " to be continued through in same time interval with LNG filling machine flow verification fundamentals
The mass flow of standard calibrating device and LNG filling machines is equal " this rule.So, standard calibrating device and LNG filling machine numbers
It is synchronously the key for ensureing measurement verification precision according to acquisition time.
The present invention is examined and determine by private communication interface and communication protocol, and calibrating installation can be with accurate perception standard test
Device and LNG filling machine data sampling time sequences, it is ensured that standard calibrating device and LNG filling machine numbers are obtained in same time interval
According to.
Calibrating installation data acquisition is strictly completed according to data acquisition communication protocol and calibrating collector timing.According to communication
Agreement provides that it is independent interface that calibrating collector communicates with standard calibrating device, LNG filling machines, can be set simultaneously with two
Preparation send instruction.It is all 8 bytes to send instruction to standard calibrating device and LNG filling machines, each 10 data of byte, baud
Rate is 9600bps, so, the instruction transmission time is 8.33ms.Similarly, it is also that specific duration, i.e. standard test are filled to receive data
It is a constant interval that acquisition time, which is put, with LNG filling machine flowmeter acquisition times.It is illustrated in figure 5 the knot that experiment is drawn
Really.
First illustrate the implication of the mark in accompanying drawing below.
Proving flowmeter self-starting was examined and determine to real-time accumulated flow value " MB1 " the loopback deadline：t1
LNG filling machine flowmeter self-startings were examined and determine to real-time accumulated flow value " MJ1 " the loopback deadline：t2
Proving flowmeter and filling machine flowmeter collection initial proving flow value deadline are poor (t1-t2)：t3
Proving flowmeter is from calibrating is terminated to real-time accumulated flow value " MB2 " the loopback deadline：t1'
LNG filling machine flowmeter self-startings were examined and determine to real-time accumulated flow value " MJ2 " the loopback deadline：t2'
It is poor (t1'-t2') that proving flowmeter terminates the calibrating flow value deadline with the collection of filling machine flowmeter：t3'
Calibrating installation sends startup calibrating instruction with sending the end calibrating command interval time：tC
Proving flowmeter gathers primary quantity to the amount of end time interval：tB
LNG filling machines flowmeter gathers primary quantity to the amount of end time interval：tJ
Illustrate verifying process flow according to an embodiment of the invention below.
As shown in fig. 6, calibrating installation starts after calibrating, flow verification collector adds to standard calibrating device with LNG simultaneously
Mechanism of qi, which is sent, takes the aggregate-value instruction of calibrating initial flow.
Proving flowmeter is connected to flow verification collector and taken after the instruction of initial flow aggregate-value, will add up at current time at once
Flow value " MB1 " loop back traffic examines and determine collector.
LNG filling machine controlling devices are connected to flow verification collector and taken after the instruction of initial flow aggregate-value, at once to its flow
Meter, which is sent, takes initial flow aggregate-value to instruct.LNG filling machine flowmeters are connected to controlling device instruction at once will current time accumulative stream
Integrated flow value " MJ1 " is transmitted back to flow verification collector by value " MJ1 " loopback controlling device, LNG filling machines controlling device again.Stream
Amount calibrating collector has obtained proving flowmeter and the initial flow aggregate-value " MB1 " of LNG filling machines and " MJ1 ".
According to verification system host computer set collection capacity parameter, flow verification collector simultaneously to proving flowmeter with
LNG filling machines, which are sent, takes calibrating to terminate the instruction of flux cumulating value.The sequential for ibid " taking calibrating initial flow aggregate-value " equally.
Proving flowmeter is connected to flow verification collector and taken after the value instruction of end flux cumulating, will add up at current time at once
Flow value " MB2 " loop back traffic examines and determine collector.
LNG filling machine controlling devices are connected to flow verification collector and take calibrating to terminate after the instruction of flux cumulating value, at once to it
Flowmeter, which is sent, takes calibrating to terminate the instruction of flux cumulating value.LNG filling machine flowmeters are connected to controlling device instruction when at once will be current
Integrated flow value " MJ2 " loopback controlling device is carved, integrated flow value " MJ2 " is transmitted back to flow verification by LNG filling machines controlling device again
Collector.Flow verification collector obtained proving flowmeter and LNG filling machines calibrating terminate flux cumulating value " MB2 " and
“MJ2”.So far, flow verification collector has obtained all numerical value of one calibrating point of proving flowmeter and LNG filling machines, and send
Calculated to PLC, finally obtain metric results.
Due to proving flowmeter and LNG filling machines flowmeter collection initial proving flow value with terminate calibrating flow value this two
The program of individual collection period is to call identical subprogram, so ensureing t1=t1' and t2=t2'.
In addition, because t2-t1=t3, t2'-t1'=t3', t3=t3' thereby ensures that tB=tC=tJ.
This result shows that proving flowmeter gathers primary quantity to the amount of end time interval phase with LNG filling machines flowmeter
Deng.And the two flowmeters are connected in a pipeline, it is ensured that " continue through standard calibrating device in same time interval
It is equal with the mass flow of LNG filling machines " this rule.
Finally, it will be appreciated by those of skill in the art that various modifications, change can be made to the above embodiment of the present invention
Type and replacement, it is each fallen within such as protection scope of the present invention defined in the appended claims.
Claims (5)
1. a kind of liquefied natural gas aerating machine verification system, it is connected with filling machine to be checked, it is characterised in that the liquefaction is natural
Gas filling machine verification system includes：
Proving flowmeter, it is connected with the aerating delivery outlet of the filling machine to be checked, for detecting adding for the filling machine to be checked
Gas output flow, and outputting standard flow count value；
Flow verification collector, it is connected with the filling machine to be checked and the proving flowmeter, for filling machine to be checked
And the proving flowmeter sends " calibrating starts " and " calibrating terminates " and instructed, and from the filling machine to be checked and the mark
Quasi- flowmeter reads the flow count value and the normal flow count value of filling machine to be checked respectively.
2. liquefied natural gas aerating machine verification system according to claim 1, it is characterised in that the proving flowmeter bag
Titer multi-phase flowmeter and Standard Gases multi-phase flowmeter are included, it is connected by fieldbus with the flow verification collector respectively.
3. liquefied natural gas aerating machine verification system according to claim 1, it is characterised in that the liquefied natural gas adds
Mechanism of qi verification system also includes programmable logic controller (PLC), pressure transmitter, and the programmable logic controller (PLC) is connected with display
Screen, interchanger, radio communication converter, guard grating, the pressure transmitter are connected to the peace by analog input loop
Full grid.
4. liquefied natural gas aerating machine verification system according to claim 1, it is characterised in that the flow verification collection
Device is connected with the controlling device of filling machine to be checked, and the controlling device is connected with the flowmeter of filling machine to be checked.
5. the liquefied natural gas that the liquefied natural gas aerating machine verification system described in one in Claims 1-4 is realized
Filling machine calibration method, comprises the following steps：
Step 1, verification system start after calibrating, and the flow verification collector is sent out to proving flowmeter and filling machine to be checked simultaneously
Go out " taking present flow rate count value " instruction, the filling machine to be checked starts simultaneously at aerating output；
Step 2, the proving flowmeter are after described " taking present flow rate count value " instruction is received, by the meter at its current time
Numerical value MB1 is sent to the flow verification collector；
Step 3, the filling machine to be checked are after described " taking present flow rate count value " instruction is received, by the meter at its current time
Numerical value MJ1 is sent to the flow verification collector；
Step 4, the filling machine to be checked continue aerating output；
Step 5, the filling machine to be checked stop aerating output, also, the flow verification collector is simultaneously to proving flowmeter
" taking present flow rate count value " instruction is sent with filling machine to be checked；
Step 6, the proving flowmeter are after described " taking present flow rate count value " instruction is received, by the meter at its current time
Numerical value MB2 is sent to the flow verification collector；
Step 7, the filling machine to be checked are after described " taking present flow rate count value " instruction is received, by the meter at its current time
Numerical value MJ2 is sent to the flow verification collector.
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| CN110398277A (en) * | 2018-04-25 | 2019-11-01 | 中国航空油料有限责任公司 | A kind of aviation kerosine tank service truck calibration method and system |
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| 赵普俊;熊茂涛;尹保来;杨修杰;雷励;张宗平;: "液化天然气加气机计量检定方法的研究" * |
| 赵普俊;熊茂涛;罗雁飞;杨修杰;: "JJG1114-2015《液化天然气加气机检定规程》解读" * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110398277A (en) * | 2018-04-25 | 2019-11-01 | 中国航空油料有限责任公司 | A kind of aviation kerosine tank service truck calibration method and system |
| CN110398277B (en) * | 2018-04-25 | 2021-08-03 | 中国航空油料有限责任公司 | Aviation kerosene fuelling vehicle verification method and system |
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