CN202349602U

CN202349602U - Calibrating device for high-precision LNG (liquefied natural gas) dispenser

Info

Publication number: CN202349602U
Application number: CN2011204646293U
Authority: CN
Inventors: 何建华
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-11-18
Filing date: 2011-11-18
Publication date: 2012-07-25
Anticipated expiration: 2021-11-18

Abstract

The utility model discloses a calibrating device for a high-precision LNG (liquefied natural gas) dispenser, which comprises a calibrating pipeline, wherein the calibrating pipeline is connected to a gas return pipe of a gas station through a filling opening connected with a filling gun of an LNG dispenser, a first flow meter and a first control valve in sequence; a gasifier is arranged between the first flow meter and the filling opening on the calibrating pipeline; and an auxiliary pipeline is also arranged between the first flow meter and the first control valve on the calibrating pipeline and is connected with a gas return gun of the LNG dispenser, a second flow meter is arranged on the auxiliary pipeline, and the auxiliary pipeline is controlled through a second control valve arranged between the second flow meter and the calibrating pipeline. The measurement result obtained after gasifying the gas phase and liquid phase in the LNG dispenser into a single-phase gaseous LNG and then measuring through the flow meters is more accurate, so that the final calibration measurement accuracy is high. The calibrating device disclosed by the utility model is simple in structure, low in cost, and convenient for operation and use.

Description

A kind of highi degree of accuracy LNG filling machine calibrating installation

Technical field

The utility model relates to LNG (LNG Liquefied natural gas) filling machine calibrating installation; Be a kind of calibrating installation that the measuring accuracy of LNG filling machine is measured specifically, more precisely a kind of measuring accuracy calibrating installation that is used for the easy gasified liquid metering equipment of ultralow temperature.

Background technique

LNG (LNG Liquefied natural gas) is a kind of clean automobile fuel and industrial chemicals.Our LNG industry development in recent years is rapid, but technological technical specifications such as the corresponding measurement verification standard of LNG filling machine, vertification regulation also are in space state, have 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 partial gasification.The LNG flowmeter is when gas-liquid mixed, and the error of metering is very big, even can not measure, and through regular meeting trade dispute takes place, and can not reach the requirement of fair trade clearing, and 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 in that aerating is on-the-spot, and the LNG that calibrating back LNG weighs in the gas cylinder reclaims difficulty etc. because LNG weighs.

Summary of the invention

To above deficiency of the prior art, the utility model aims to provide a kind of highi degree of accuracy LNG filling machine calibrating installation, modern design, and easy for operation, cost is low, and the calibrating measuring accuracy is high.

The technological scheme of the utility model: a kind of highi degree of accuracy LNG filling machine calibrating installation, it comprises the calibrating pipeline,

Said calibrating pipeline: filling opening, first flow meter, first control valve through being connected with the liquid feeding rifle of LNG filling machine are connected in the muffler of gas station successively; Be provided with vaporizer between first flow meter and the filling opening on the said calibrating pipeline.

Also be provided with between the first flow meter on the said calibrating pipeline and first control valve on the return-air rifle that the looped pipeline road is connected to the LNG filling machine; On this looped pipeline road, be provided with second flowmeter, and through being arranged on second control valve control between this second flowmeter and the calibrating pipeline.

Said looped pipeline road is provided with one-way valve, and this one-way valve is located between said second flowmeter and the LNG filling machine.

Said calibrating pipeline is provided with pressure gauge and pressure transducer, and this pressure gauge and pressure transducer are located between first control valve or second control valve and the vaporizer.

Before carrying out LNG filling machine calibrating, the liquid feeding rifle of LNG filling machine to be detected is connected with the filling opening of this device, the return-air mouth of this device is connected with the return-air rifle of LNG filling machine, the end of this device being examined and determine pipeline is connected in the muffler of gas station.

If LNG filling machine to be checked is the non-metering filling machine of return-air, close second control valve, open first control valve; Directly only use the calibrating pipeline; To the flow through gas-liquid two-phase LNG of this calibrating pipeline of vaporizer is gasified totally and is gas, measures through the first flow meter, draws the variable M1 of this calibrating installation; Variable through itself and LNG filling machine to be checked compares, and can obtain the error in dipping of this LNG filling machine;

If LNG filling machine to be checked is the filling machine that has the return-air metering, then often open first control valve, control the opening degree of second control valve through the size of the force value on the pressure gauge; To the flow through gas-liquid two-phase LNG of this calibrating pipeline of vaporizer is gasified totally and is gas, measures through the first flow meter, draws variable M1; Through the gas of this first flow meter, a part flow in the muffler of gas station through first control valve, and another part can flow back in the LNG filling machine through second control valve, second flowmeter; Draw variable M2; Its working principle with the said LNG filling machine that has a return-air metering is consistent, and therefore, total variable of calibrating installation at this moment is M1+M2; The variable of itself and LNG filling machine to be checked is compared, can obtain the error in dipping of this LNG filling machine.

The utility model has overcome the LNG flowmeter when gas-liquid mixed; The shortcoming that the error in dipping of flowmeter is big; The gas-liquid mixed LNG of the flowmeter of flowing through is gasified totally through vaporizer, becomes single-phase gaseous state, and then measure through flowmeter by gas-liquid two-phase; Make that the demonstration numerical value of flowmeter is more accurate, and then make that final calibration accuracy is more accurate.

In practical operation, this highi degree of accuracy LNG filling machine calibrating installation adopts the fast-assembling mode to be connected in series mutually with LNG filling machine to be checked, can carry out on-site proving to LNG filling machine to be checked easily, does not need extra place to examine and determine separately.

In addition, the present invention compares with weight method, has reduced the high-precision electronic scale, has reduced cost.

Liquid feeding rifle through LNG filling machine to be checked is added to this highi degree of accuracy LNG filling machine calibrating installation with LNG, after metering, is back in the muffler of gas station or LNG again, the problem of having avoided the LNG after the calibrating to be difficult to reclaim.

Therefore, this calibrating installation has solved the difficult problem that the LNG gas-liquid two-phase flow can not accurately measure, and gas-liquid two-phase flow is transformed into single phase gas, has measuring accuracy height, simple in structure, low cost and other advantages.

Description of drawings

Fig. 1 is the principle assumption diagram of the utility model.

In the accompanying drawing, the 1-LNG filling machine; 2-liquid feeding rifle; The 3-filling opening; The 4-vaporizer; 5-first flow meter; The 6-pressure gauge; The 7-pressure transducer; 8-first control valve; 9-second control valve; 10-second flowmeter; The 11-one-way valve; 12-return-air mouth; 13-return-air rifle.

Embodiment

Come further explain the utility model below in conjunction with specific embodiment and accompanying drawing.

Referring to Fig. 1, described highi degree of accuracy LNG filling machine calibrating installation, it comprises the calibrating pipeline,

Said calibrating pipeline: filling opening 3, first flow meter 5, first control valve 8 through being connected with the liquid feeding rifle 2 of LNG filling machine 1 are connected in the muffler of gas station successively; Be provided with vaporizer 4 between first flow meter 5 and the filling opening 3 on the said calibrating pipeline.

Further; Also be provided with between the first flow meter 5 on the said calibrating pipeline and first control valve 8 on the return-air rifle 13 that the looped pipeline road is connected to the LNG filling machine; On this looped pipeline road, be provided with second flowmeter 10, and through being arranged on second control valve, 9 controls between this second flowmeter 10 and the calibrating pipeline.

The highi degree of accuracy LNG filling machine calibrating installation that the utility model relates to is simple in structure, easy to operate, is directly flowed in this calibrating installation by the LNG in the LNG filling machine to be checked; After measuring numerical value at last, be back to again in the muffler of gas station, do not need extra LNG storage device in the verification process; Than traditional weight method; The utility model has been simplified verification step, has reduced the equipment in the verification process, has practiced thrift cost.

Particularly; The calibrating pipeline that forms by filling opening 3, vaporizer 4, first flow meter 5 and first control valve 8; Be applicable to the measuring accuracy of the non-metering LNG filling machine of calibrating return-air; And through on the calibrating pipeline between the vaporizer 4 and first control valve 8, setting up pressure gauge 6 and pressure transducer 7, through the Pressure testing data on the pressure gauge 6, the easy-to-operat personnel can monitor calibrating pressure at any time.When examining and determine; The filling opening 3 of this device is connected with the liquid feeding rifle 2 of LNG filling machine to be checked, the end of examining and determine pipeline is connected in the muffler of gas station, only need open first control valve 8; Certainly need close second control valve 9; By liquid feeding rifle filling LNG, through the vaporizer 4 in the calibrating pipeline gas-liquid two-phase LNG being gasified totally is single-phase gaseous state LNG, at this moment; The variable of LNG flow M1. through itself and LNG filling machine to be checked that said first flow meter 5 can accurately measure in this calibrating pipeline compares comparison, can obtain the error in dipping of this LNG filling machine.

And on the basis of calibrating pipeline; Added the looped pipeline road; Draw between the first flow meter 5 and first control valve 8 on this looped pipeline road, is connected to successively on the return-air rifle 13 of LNG filling machine to be checked by second control valve 9, second flowmeter 10, and the return-air mouth 12 through this device is connected with the return-air rifle 13 of LNG filling machine to be measured; And between said second flowmeter 10 and return-air mouth 12, being provided with one-way valve 11, this one-way valve 11 mainly is in order to prevent that the LNG in the LNG filling machine to be checked from refluxing.The measuring accuracy that is used to examine and determine the filling machine that has the return-air metering through calibrating pipeline and looped pipeline road appropriate.When examining and determine; The filling opening 3 of this calibrating installation is connected with the liquid feeding rifle 2 of LNG filling machine to be checked; The return-air mouth 12 of this calibrating installation is connected with the return-air rifle 13 of LNG filling machine to be checked; And the end that will examine and determine pipeline is connected in the muffler of gas station; Often open first control valve 8, carry out the opening degree on manual tune second control valve 9 through being built up in pressure gauge 6 between first control valve 8 and the vaporizer 4 or the force value that is built up on the pressure gauge 6 between second control valve 8 and the vaporizer 4.By liquid feeding rifle 2 to this calibrating installation filling LNG; Through vaporizer 4 gas-liquid two-phase LNG is gasified totally and is single-phase gaseous state LNG; And in the muffler of calibrating pipeline to the gas station that flows through; Because second control valve 9 also is in opening state or semi-open state in verification process, the single-phase gaseous state LNG of part gets into the looped pipeline road and flow in the LNG filling machine to be checked, and measures through second flowmeter 10.In whole verification process, the first flow meter 5 and second flowmeter 10 all measure the single-phase gaseous state LNG in the pipeline, the metering result than traditional standard table method metering gas-liquid two-phase LNG more accurately, more accurate.This calibrating principle is consistent with the aerating principle of LNG filling machine to be checked, and therefore, the metering total value of calibrating is M1+M2 at last, and the variable through itself and LNG filling machine to be checked compares comparison, can obtain the error in dipping of this LNG filling machine.

For the preparation of equipment, said one-way valve 11, first flow meter 5, second flowmeter 10, vaporizer 4, pressure transducer 7 all are arranged in the casing; And said filling opening 3, return-air mouth 12, pressure gauge 6, first control valve 8, second control valve 9 all are arranged on the engine housing.

In addition, also can input to and carry out said first control valve 8 of intelligent control and second control valve 9 in the single-chip microcomputer, make whole calibrating installation realize automation through the transducing signal on the pressure transducer 7.

The above is merely the detailed description of the utility model preferred embodiment and graphic, is not to be used for limiting the utility model, and the embodiment or the approximate construction of all similar variations of doing according to the creation spirit of the utility model all should be contained among the utility model.

Claims

1. a highi degree of accuracy LNG filling machine calibrating installation comprises the calibrating pipeline, it is characterized in that:

2. a kind of highi degree of accuracy LNG filling machine calibrating installation according to claim 1; It is characterized in that: also be provided with between the first flow meter on the said calibrating pipeline and first control valve on the return-air rifle that the looped pipeline road is connected to the LNG filling machine; On this looped pipeline road, be provided with second flowmeter, and through being arranged on second control valve control between this second flowmeter and the calibrating pipeline.

3. a kind of highi degree of accuracy LNG filling machine calibrating installation according to claim 2, it is characterized in that: said looped pipeline road is provided with one-way valve, and this one-way valve is located between said second flowmeter and the LNG filling machine.

4. according to claim 1 or 2 or 3 described a kind of highi degree of accuracy LNG filling machine calibrating installations; It is characterized in that: said calibrating pipeline is provided with pressure gauge and pressure transducer, and this pressure gauge and pressure transducer are located between first control valve or second control valve and the vaporizer.