CN102401235A - LNG (Liquefied Natural Gas) dispenser calibrating device - Google Patents
LNG (Liquefied Natural Gas) dispenser calibrating device Download PDFInfo
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- CN102401235A CN102401235A CN2011103600757A CN201110360075A CN102401235A CN 102401235 A CN102401235 A CN 102401235A CN 2011103600757 A CN2011103600757 A CN 2011103600757A CN 201110360075 A CN201110360075 A CN 201110360075A CN 102401235 A CN102401235 A CN 102401235A
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Abstract
The invention discloses an LNG (Liquefied Natural Gas) dispenser calibrating device, comprising a liquid filling pipeline and a gas return pipeline comprising a third flowmeter, wherein on a liquid filling pipeline, a liquid filling interface, a first flowmeter, a first control valve, a liquid filling hose, a liquid filling gun which is connected with a liquid filling port of an vehicle-mounted LNG gas cylinder are connected in sequence, and the liquid filling interface, the first flowmeter, the first control valve and the liquid filling hose are connected with a liquid filling gun head of an LNG dispenser; and on the liquid filling pipeline, a second pipeline is further used for sequentially connecting a gasifier and a second flowmeter into a gas return pipe of a LNG filling station and is controlled through a second control valve, the inlet of the second pipeline is connected between the first flowmeter and the first control valve, and the second control valve is connected between the gasifier and the first flowmeter. According to the invention, the defect of large metering error of the flowmeters after a gas-liquid mixing proportion exceeds a certain numerical value is overcome; and by controlling the gas-liquid mixing proportion of LNG flowing through the first flowmeter below the numerical value for calibration, the display numerical value of the first flowmeter is high in accuracy degree, and thus, the final calibration precision is more accurate.
Description
Technical field
The present invention relates to LNG (LNG Liquefied natural gas) filling machine calibrating installation, is a kind of calibrating installation that the measuring accuracy of LNG filling machine is measured specifically, more accurately is a kind of measuring accuracy calibrating installation that ultralow temperature is prone to the gasified liquid metering equipment that is used for.
Background technique
LNG (LNG Liquefied natural gas) is a kind of clean automobile fuel and industrial chemicals.Our LNG industry development is rapid in recent years; But technological technical specifications such as the corresponding measurement verification standard of LNG filling machine, vertification regulation also are in space state; Particularly do not adapt to the standard set-up that the on-the-spot measuring accuracy of using to the LNG filling machine of LNG gas station is examined and determine, restricted developing and technological progress of this industry.
LNG is the liquid of a kind of ultralow temperature (162 ℃), is easy to gasification, produces gas, liquid two-phase.All there is the situation of gas-liquid mixed two phase flow in present LNG filling machine in pipeline, especially just entered into pipeline at LNG, because of the temperature of pipeline itself is higher than the temperature of said LNG itself, causes gasification.Than surpassing when a certain amount of, the error of metering is very big, even can not measure in gas-liquid mixed for the LNG flowmeter; Trade dispute takes place through regular meeting; Can not reach the requirement of fair trade clearing, therefore, needing a kind of the device can examine and determine the measuring accuracy of LNG filling machine.
If adopt traditional standard table method, because the LNG liquid of the standard scale of flowing through can produce gas, liquid two-phase, make that the error in dipping of standard scale is very big, can't satisfy the calibrating requirement.
And if adopt traditional weight method, through the LNG filling machine LNG is joined a LNG and weighs in the gas cylinder, the LNG that adds in it is weighed; Shortcoming has a lot; At first, when adding LNG, need after the LNG emptying in it at every turn; Just can in LNG weighs gas cylinder, add LNG, this feasible scale of construction of dropping a hint is big; The LNG gas cylinder quality of weighing is big in addition, is difficult for moving; Also have the quality of gas cylinder big, make weighing-appliance use inconvenience etc. at the aerating scene because LNG weighs.
Summary of the invention
To above deficiency of the prior art, the present invention aims to provide a kind of LNG filling machine calibrating installation, and is simple to operate, and the calibrating measuring accuracy is high.
Technological scheme of the present invention: LNG filling machine calibrating installation; Comprise liquid feeding pipeline and the return line that contains the 3rd flowmeter; Wherein, Liquid feeding pipeline: be connected successively through liquid feeding interface, first flow meter, first control valve, liquid feeding flexible pipe that is connected with the liquid feeding rifle head of LNG filling machine and the liquid feeding rifle that is connected with the filling opening of vehicle-mounted LNG gas cylinder; On said liquid feeding pipeline, also connect successively in the muffler of vaporizer, second flowmeter to gas station through second pipeline; This second pipeline is through second control valve control, and the import of this second pipeline is connected between the first flow meter and first control valve, and said second control valve is connected between vaporizer and the first flow meter.
Said return line: return-air rifle, return-air flexible pipe through being connected with the return-air mouth of vehicle-mounted LNG gas cylinder are connected with the 3rd flowmeter successively, are back in the LNG filling machine through the 3rd one-way valve then.
Also be provided with first one-way valve in the said feed liquor pipeline, the import of this first one-way valve is located between first control valve and the liquid feeding rifle, and outlet is located between first control valve and the first flow meter or second control valve.
Be provided with pressure transducer and pressure gauge in the said liquid feeding pipeline, said pressure transducer and pressure gauge are located between the first flow meter and first control valve.
Also be provided with manually operated valve on said second pipeline, this manually operated valve is located between the muffler of said second flowmeter and gas station.
Said liquid feeding flexible pipe and return-air flexible pipe are the low-temperature metal flexible pipe.
In addition; Said LNG filling machine calibrating installation also includes processing controller; Detected data from said first flow meter and pressure transducer; Transfer to this processing controller and carry out analysing and processing, control first control valve and second control valve respectively and open and close, and this first flow meter of control carries out the zero clearing processing.
Detected data from said first flow meter, second flowmeter and the 3rd flowmeter are sent to this processing controller and carry out analysing and processing, to judge the measuring accuracy of LNG filling machine.
Simultaneously, also include display device, this display device links to each other with said processing controller, and it is used for the data display in the said processing controller.
Said processing controller is a single-chip microcomputer.
At first, carry out LNG filling machine calibrating before, close second control valve; The liquid feeding rifle head of LNG filling machine to be detected is connected with the liquid feeding interface of this calibrating installation, and the liquid feeding rifle of this calibrating installation is connected with the liquid return hole of LNG filling machine, opens first control valve; Make the gas-liquid LNG in the LNG filling machine in this pipeline loop, carry out precooling, make that the temperature of whole pipeline temperature inside and said LNG is suitable, avoid influencing the gas-liquid state of LNG; And then influence calibration accuracy; Certainly, this precooling stage, said LNG filling machine did not measure, among the numerical value that produces of first flow meter treat precooling accomplish after zero clearing.
Then; The liquid feeding rifle of this device is linked to each other with the filling opening of LNG gas cylinder; The return-air rifle of this device is connected with the return-air mouth of LNG gas cylinder, the return-air interface of this device is connected with the air gun head that returns of LNG filling machine, and the termination of second pipeline is accessed in the muffler of gas station.
When carrying out the calibrating of LNG filling machine; Close first control valve, open second control valve, from the LNG gas-liquid two-phase of liquid feeding rifle head outflow; Get in the muffler of gas station through liquid feeding interface, first flow meter, second control valve, vaporizer, second flowmeter; At this moment, for single-phase, the gas that flows through measures through second flowmeter vaporizer with the gas-liquid two-phase gasification; And parameters such as the temperature of first flow meter detection LNG and density; When the temperature that detects LNG and density reach default value; The zero clearing of said first flow meter also begins metering; Close second control valve simultaneously, open first control valve, LNG enters into the LNG gas cylinder through liquid feeding flexible pipe, liquid feeding rifle, filling opening; Turn back in the filling machine through return line for the gas in the LNG gas cylinder, at this moment, the gas that flows through in the return line measures through the 3rd flowmeter.The variable of final LNG filling machine calibrating installation is M1+M2-M3, through the contrast of the variable in itself and the said LNG filling machine, can draw the measuring accuracy of this LNG filling machine.
The present invention has overcome the LNG flowmeter after the gas-liquid mixed ratio surpasses certain numerical value; The very large shortcoming of error of metering; LNG gas-liquid mixed proportional control through the first flow meter of will flowing through this below value even more low value examine and determine; Make that the demonstration numerical value degree of accuracy of first flow meter is higher, and then make that final calibration accuracy is more accurate.
In practical operation; This LNG filling machine calibrating installation adopts the fast-assembling mode to be connected in series mutually with LNG filling machine to be checked, and liquid feeding rifle and the return-air rifle at LNG filling machine calibrating installation also adopts the fast-assembling mode to be connected in series LNG automobile gas holder mutually simultaneously, that is to say the LNG gas cylinder among the present invention; Like this; Can realize on-site proving in to LNG refueling process at the LNG filling machine, not need extra place to examine and determine separately, also can not receive the influence of LNG gas station site environment factor the LNG filling machine.
In addition, the present invention compares with weight method, has reduced the high-precision electronic scale, has reduced cost.
At last; Easy for operation, the present invention adopts processing controller that measurement verification is monitored and data capture in real time, and said first control valve and second control valve all are after through processing controller image data being carried out analysing and processing; Control respectively by processing controller again; Complete mechanicalization, and all video datas can show the easy-to-operat personnel control fully in display device.
Description of drawings
Fig. 1 is a principle assumption diagram of the present invention;
Fig. 2 is an aerating calibrating structural representation of the present invention;
Fig. 3 is a circuit control block diagram of the present invention.
In the accompanying drawing, the 1-liquid feeding interface; 2-first flow meter; The 3-pressure gauge; The 4-pressure transducer; 5-first one-way valve; 6-liquid feeding flexible pipe; 7-liquid feeding rifle; 8-first control valve; 9-second control valve; The 10-vaporizer; The 11-liquid return hole; The muffler of 12-gas station; 13-second flowmeter; The 14-manually operated valve; 15-returns air gun head; 17-return-air interface; 18-the 3rd one-way valve; 19-the 3rd flowmeter; 20-return-air flexible pipe; 21-return-air rifle; 22-liquid feeding rifle head; The 23-LNG filling machine; The 24-filling opening; The 25-LNG gas cylinder; 26-return-air mouth.
Embodiment
Come further explain the present invention below in conjunction with embodiment and accompanying drawing.
See also Fig. 1 to Fig. 3, described LNG filling machine calibrating installation comprises liquid feeding pipeline and the return line that contains the 3rd flowmeter 19, wherein,
Said liquid feeding pipeline: the liquid feeding interface 1 through being connected with the liquid feeding rifle head 22 of LNG filling machine 23, first flow meter 2, first control valve 8, liquid feeding flexible pipe 6 and the liquid feeding rifle 7 that is connected with the filling opening 24 of vehicle-mounted LNG gas cylinder 25 are connected successively,
Said return line: return-air rifle 21, return-air flexible pipe 20 through being connected with the return-air mouth 26 of vehicle-mounted LNG gas cylinder 25 are connected with the 3rd flowmeter 19 successively, are back in the LNG filling machine 23 through the 3rd one-way valve 18 then;
On said liquid feeding pipeline, also connect successively in the muffler 12 of vaporizer 10, second flowmeter 13 to the gas station through second pipeline; This second pipeline is through 9 controls of second control valve; And the import of this second pipeline is connected between the first flow meter 2 and first control valve 8, and said second control valve 9 is connected between vaporizer 10 and the first flow meter 2.
The LNG filling machine calibrating installation that the present invention relates to is improved on the basis of at present existing LNG filling machine measurement verification standard set-up accepted standard table method; Particularly; On the liquid feeding pipeline that forms by liquid feeding interface 1, first flow meter 2, first control valve 8, liquid feeding flexible pipe 6 and liquid feeding rifle 7; Between the said first flow meter 2 and first control valve 8, establish pressure transducer 4 and pressure gauge 3; So that operator can monitor the variation in pressure on the liquid feeding pipeline; When loine pressure is excessive, can be through manually or automatically carrying out step-down, and pressure transducer 4 can be converted into the variation in pressure in this liquid feeding pipeline electrical signal and wears in the follow-up processing controller of input and carry out analysing and processing.
In said feed liquor pipeline, also be provided with first one-way valve 5; The import of this first one-way valve 5 is located between first control valve 8 and the liquid feeding rifle 7; Outlet is located between first control valve 8 and the first flow meter 2 or second control valve 9, and it mainly acts on is when adding after the LNG, remaining in the interior LNG of liquid feeding pipeline and can pass through these first one-way valve, 5 backflow releases; Avoid the LNG liquid gasification back pressure in the flexible pipe to raise, the LNG flexible pipe is burst.
On the return line that forms by return-air rifle 21, return-air flexible pipe 20, the 3rd flowmeter 19, the 3rd one- way valve 18 and 17 series connection of return-air interface; 18 effects of described the 3rd one-way valve are after return-air interface 17 and time air gun head 15 join, and prevent that the LNG in the LNG filling machine 23 from flowing to said LNG gas cylinder 25 from return line.Be back in the LNG filling machine 23 for the LNG in the return line.
And second pipeline that is formed by second control valve 9, vaporizer 10, second flowmeter 13 be located between the first flow meter 2 and first control valve 8 is connected in the muffler of said gas station; Because of this part gaseous state LNG is gasified totally into gas phase through vaporizer 10, enter in the muffler 12 of gas station.On this second pipeline, also be provided with manually operated valve 14, this manually operated valve 14 is located between the muffler 12 of said second flowmeter 13 and gas station.
In use, said liquid feeding flexible pipe 6 is the low-temperature metal flexible pipe with return-air flexible pipe 20.And remaining all pipeline adopts the thermal insulating material insulation, makes that in whole verification process said exterior material, ambient temperature factor are reduced to minimum degree to the influence of verification result.
For the preparation of equipment, said first control valve 8, second control valve 9, first one-way valve 5, second one-way valve 12, the 3rd one-way valve 18 are all taked the thermal insulating material insulation and are arranged in the engine housing; Said first flow meter 2, second flowmeter 13, the 3rd flowmeter 19, vaporizer 10, pressure transducer 4 all are arranged in the casing; And said liquid feeding interface 1, return-air interface 17, liquid feeding rifle 7, return-air rifle 21, pressure gauge 3 and manually operated valve 14 all are arranged on the engine housing.
During application; Earlier the liquid feeding pipeline is carried out precooling treatment, that is to say, close second control valve 9 earlier; The liquid feeding rifle head 22 of LNG filling machine 23 to be detected is connected with the liquid feeding interface 1 of this calibrating installation, and the liquid feeding rifle 7 of this calibrating installation is connected with the liquid return hole 11 of LNG filling machine 23.Open first control valve 8; Make the gas-liquid LNG in the LNG filling machine 23 in this pipeline loop, carry out precooling, make that the temperature of whole pipeline temperature inside and said LNG is suitable, avoid influencing the gas-liquid state of LNG; And then influence calibration accuracy; Certainly, this precooling stage, said LNG filling machine 23 did not measure, among the numerical value that produces of first flow meter 2 treat precooling accomplish after zero clearing.Just can carry out measurement verification then.
When carrying out 23 calibratings of LNG filling machine; Close first control valve 8; The LNG gas-liquid two-phase that flows out from liquid feeding rifle head 22 gets in the muffler 12 of gas stations, at this moment through liquid feeding interface 1, first flow meter 2, second control valve 9, vaporizer 10, second flowmeter 13; For single-phase, the gas that flows through measures through second flowmeter 13 vaporizer 10 with gas-liquid two-phase LNG gasification; And parameters such as the temperature of first flow meter 2 detection LNG and density; When the temperature that detects LNG and density reach default value; Said first flow meter 2 zero clearings also begin metering; Close second control valve 9 simultaneously, open first control valve 8, LNG enters into LNG gas cylinder 25 through liquid feeding flexible pipe 6, liquid feeding rifle 7, filling opening 24; Turn back in the LNG filling machine 23 through return line for the gas in the LNG gas cylinder 25, at this moment, the gas that flows through in the return line measures through the 3rd flowmeter 19.The variable of final LNG filling machine calibrating installation is M1+M2-M3, through the contrast of the variable in itself and the said LNG filling machine 23, can draw the measuring accuracy of this LNG filling machine 23.
Simple for structure, the process simplification of LNG of the present invention (LNG Liquefied natural gas) filling machine calibrating installation, calibrating speed is fast, measuring accuracy is high.Muffler and two pipelines of liquid-feeding tube of only needing LNG filling machine 23 to provide in the verification process do not have remaining unnecessary pipeline, and are easy to operate, receive the influence of site environment factor very little; This LNG filling machine calibrating installation does not influence the normal use of LNG filling machine 23; Can make filling of vehicle-mounted LNG air cylinder reach the highest rate of filling that allows during 23 pairs of LNG gas cylinder 25 liquid feedings of LNG filling machine; Promptly at liquid feeding rifle 7 in 25 filling of vehicle-mounted LNG gas cylinder; LNG boil-off gas in the LNG gas cylinder 25 is returned in the LNG filling machine 23 via return line through return-air rifle 21; Be used to reduce the pressure of boil-off gas in the vehicle-mounted LNG gas cylinder 25, allow to fill liquid level thereby can make vehicle-mounted LNG liquid filling reach maximum, the LNG that has yet overcome the weighing of mass method institute does not simultaneously allow on-the-spot discharging after calibrating is accomplished; The on-the-spot recovery difficult of LNG is big, does not reclaim and can cause the problem of significant wastage.
Further; Described LNG filling machine calibrating installation also comprises processing controller and display device; Said display device links to each other with processing controller; Simultaneously, processing controller is connected with first flow meter 2, second flowmeter 13, the 3rd flowmeter 19, pressure transducer 4 and first control valve 8, second control valve 9 respectively.
Processing controller among the present invention is mainly used in the collection and the processing of data; Simultaneously, the open and close of Monitoring and Controlling first control valve 8 and second control valve 9, this example is preferably single-chip microcomputer; Certainly, processing controller is MCU or directly carries out processing control through computer such as desktop computer etc.Said display device is used for the demonstration to data of gathering in the said processing controller and data processing, easy-to-operat personnel on-site supervision at any time.
Working contents for processing controller has,
When 1, waiting to connect pipeline, control 8 unlatchings of first control valve and second control valve 9 and close, carry out precooling treatment.
2, after precooling treatment is finished; Processing controller controls that first control valve 8 is closed and second control valve 9 is opened, and said LNG filling machine carries out aerating, and gathers the parameters such as temperature and density of the LNG that first flow meter 2 detects in real time; And the pressure parameter on the pressure transducer 4; Carry out data analysis then, when parameters such as the temperature of the LNG that detects when this first flow meter 2 and density reach the initially preset numerical value of system, control 8 unlatchings of first control valve by processing controller; Control second control valve 9 and close, and control the data zero clearing in the said first flow meter 2.
3, gather detected continuous data in said first flow meter 2, second flowmeter 13 and the 3rd flowmeter 19; And carry out analysing and processing; Just respectively detected continuous data M1, M2, M3 in first flow meter 2, second flowmeter 13 and the 3rd flowmeter 19 are added and subtracted; Total aerating metering of said LNG filling machine 23 is M1+M2-M3, compares through the metering that will be somebody's turn to do in total metering and the said LNG filling machine 23, and whether the measuring accuracy that draws this LNG filling machine 23 is accurate.
3, gather data on the pressure transducer 4, compare, detect the whether overshoot of hydraulic pressure in the whole liquid feeding pipeline, as exceed, then carry out step-down and handle with numerical value preset in the said processing controller.
The above is merely the detailed description of preferred embodiment of the present invention and graphic, is not to be used for limiting the present invention, and the embodiment or the approximate construction of all similar variations of doing according to creation spirit of the present invention all should be contained among the present invention.
Claims (10)
1.LNG the filling machine calibrating installation comprises liquid feeding pipeline and the return line that contains the 3rd flowmeter, wherein,
Said liquid feeding pipeline: be connected successively through liquid feeding interface, first flow meter, first control valve, liquid feeding flexible pipe that is connected with the liquid feeding rifle head of LNG filling machine and the liquid feeding rifle that is connected with the filling opening of vehicle-mounted LNG gas cylinder, it is characterized in that:
On said liquid feeding pipeline, also connect successively in the muffler of vaporizer, second flowmeter to gas station through second pipeline; This second pipeline is through the control of second control valve; And the import of this second pipeline is connected between the first flow meter and first control valve, and said second control valve is connected between vaporizer and the first flow meter.
2. LNG filling machine calibrating installation according to claim 1; It is characterized in that: said return line: return-air rifle, return-air flexible pipe through being connected with the return-air mouth of vehicle-mounted LNG gas cylinder are connected with the 3rd flowmeter successively, are back in the LNG filling machine through the 3rd one-way valve then.
3. LNG filling machine calibrating installation according to claim 1; It is characterized in that: also be provided with first one-way valve in the said feed liquor pipeline; The import of this first one-way valve is located between first control valve and the liquid feeding rifle, and outlet is located between first control valve and the first flow meter or second control valve.
4. LNG filling machine calibrating installation according to claim 1 is characterized in that: be provided with pressure transducer and pressure gauge in the said liquid feeding pipeline, said pressure transducer and pressure gauge are located between the first flow meter and first control valve.
5. LNG filling machine calibrating installation according to claim 1 is characterized in that: also be provided with manually operated valve on said second pipeline, this manually operated valve is located between the muffler of said second flowmeter and gas station.
6. LNG filling machine calibrating installation according to claim 2 is characterized in that: said liquid feeding flexible pipe and return-air flexible pipe are the low-temperature metal flexible pipe.
7. according to any described LNG filling machine calibrating installation in the claim 1 to 6; It is characterized in that: also comprise processing controller; Detected data from said first flow meter and pressure transducer; Transfer to this processing controller and carry out analysing and processing, said processing controller controls first control valve respectively and second control valve opens and closes, and control is carried out the zero clearing processing to this first flow meter.
8. LNG filling machine calibrating installation according to claim 7; It is characterized in that: detected data from said first flow meter, second flowmeter and the 3rd flowmeter; Be sent to this processing controller and carry out analysing and processing, to judge the measuring accuracy of LNG filling machine.
9. LNG filling machine calibrating installation according to claim 7 is characterized in that: also include display device, this display device links to each other with said processing controller, and it is used for the data display in the said processing controller.
10. LNG filling machine calibrating installation according to claim 7 is characterized in that: said processing controller is a single-chip microcomputer.
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| CN2011103600757A CN102401235A (en) | 2011-11-11 | 2011-11-11 | LNG (Liquefied Natural Gas) dispenser calibrating device |
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| CN2011103600757A CN102401235A (en) | 2011-11-11 | 2011-11-11 | LNG (Liquefied Natural Gas) dispenser calibrating device |
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| CN102705700A (en) * | 2012-05-31 | 2012-10-03 | 天津华迈燃气装备股份有限公司 | Liquid filler for liquefied natural gas vehicle |
| CN103629525A (en) * | 2013-12-03 | 2014-03-12 | 重庆耐德能源装备集成有限公司 | Intelligent high-precision LNG filling metering device |
| CN104296822A (en) * | 2014-09-29 | 2015-01-21 | 中国科学院电工研究所 | Method and device for measuring liquid level of superconducting power device |
| CN105318939A (en) * | 2014-08-05 | 2016-02-10 | 重庆巨创计量设备股份有限公司 | LNG dispenser calibrating device |
| US20170089752A1 (en) * | 2015-09-28 | 2017-03-30 | Tatsuno Corporation | Calibration apparatus |
| CN106609907A (en) * | 2015-10-24 | 2017-05-03 | 河北斯玛特深冷技术有限公司 | Filling and air return integrated LNG vehicle-mounted gas cylinder |
| CN106609909A (en) * | 2015-10-24 | 2017-05-03 | 河北斯玛特深冷技术有限公司 | LNG vehicle-mounted cylinder |
| EP3299776A1 (en) * | 2016-09-26 | 2018-03-28 | Tatsuno Corporation | Calibration apparatus |
| CN107957284A (en) * | 2016-10-14 | 2018-04-24 | 株式会社龙野 | Calibrating installation |
| CN111197694A (en) * | 2020-01-06 | 2020-05-26 | 阜阳国祯燃气有限公司 | LNG steel cylinder filling device and method |
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| EP3299776A1 (en) * | 2016-09-26 | 2018-03-28 | Tatsuno Corporation | Calibration apparatus |
| CN107957284A (en) * | 2016-10-14 | 2018-04-24 | 株式会社龙野 | Calibrating installation |
| CN111197694A (en) * | 2020-01-06 | 2020-05-26 | 阜阳国祯燃气有限公司 | LNG steel cylinder filling device and method |
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Application publication date: 20120404 |