CN112903068A - Non-constant-current low-temperature static mass method calibrating device and method thereof - Google Patents
Non-constant-current low-temperature static mass method calibrating device and method thereof Download PDFInfo
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- 238000011084 recovery Methods 0.000 claims description 22
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- 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
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Abstract
The invention discloses a non-constant-current low-temperature static mass method calibrating device and a method thereof. The non-constant-flow low-temperature static mass method calibrating device provided by the invention has the advantages that in order to ensure the temperature of the recovered liquid, the recovered liquid is cooled through the deep cooling tank and then enters the low-temperature storage tank, so that the liquid is prevented from being gasified, and the frosting of a pipeline and an outlet is also avoided. In addition, the pipeline provided by the invention adopts a vacuum pipeline, and other parts are subjected to heat preservation treatment to prevent liquid gas.
Description
Technical Field
The invention relates to the technical field of flow detection, in particular to a non-constant-flow low-temperature static mass method calibrating device and a method thereof.
Background
The critical temperature of LNG (liquefied natural gas) under normal pressure is-162 ℃, the LNG is easy to gasify, and pipelines and outlets are easy to frost. Low temperature and high gas-liquid expansion ratio. In recent years, the problem of ecological environmental pollution is more and more emphasized by the nation and the public, and LNG is determined as a preferred low-carbon energy source by the national development and improvement committee and the department of living and construction as a clean, efficient and low-carbon energy source. Among all clean fuels, natural gas is regarded by many countries and experts in the world as the most suitable alternative fuel for automobiles at present due to mature application technology, safety, reliability and economic feasibility, and particularly, the application of LNG to automobiles is mainly urban public transportation, sanitation vehicles, taxis, intercity buses, heavy trucks and the like. LNG wharfs, LNG factories and LNG gas stations are increasing year by year, which relates to trade metering, and since LNG belongs to cryogenic liquid, a verification tank for storing liquid in the existing normal-temperature static mass method is non-closed, the traditional static mass method is that the weighed weight value is gradually increased, and the new low-temperature static mass method is that the weighed weight value is gradually decreased.
Disclosure of Invention
In order to solve the limitations and defects of the prior art, the invention provides a non-constant-current low-temperature static mass method calibrating device, which comprises a low-temperature standard tank, an electronic balance, a deep cooling tank, a low-temperature storage tank, a recovery tank, a power source, a first pneumatic valve, a second pneumatic valve, a third pneumatic valve, a fourth pneumatic valve, a fifth pneumatic valve, a first quick link valve group, a second quick link valve group and a to-be-detected meter;
the low-temperature standard tank is arranged on the electronic balance and used for storing low-temperature media used for verification, the low-temperature standard tank is made of a vacuum tank, the electronic balance is used for weighing weight changes of the media and providing standard weight, one end of the low-temperature standard tank is connected with the low-temperature storage tank through the second quick link valve group, the other end of the low-temperature standard tank is connected with one end of the meter to be detected through the first pneumatic valve, the other end of the meter to be detected extends into the inner space of the recovery tank through the second pneumatic valve, and the other end of the meter to be detected is connected with the power source through the first quick link valve group;
the lower part position of retrieving the jar with the one end of cryogenic tank is connected, retrieve the jar and be used for storing the used middle liquid of examination, the other end of cryogenic tank passes through third pneumatic valve with the power supply is connected, the cryogenic tank is used for retrieving the liquid cooling, the low temperature storage tank passes through respectively the fourth pneumatic valve with fifth pneumatic valve with the power supply is connected, the low temperature storage tank is used for providing the low temperature liquid that the examination needs, the pneumatic valve is used for changing the flow direction of medium in the pipeline.
Optionally, the outer shell of the cryogenic tank is made using vacuum.
Optionally, the housing of the recovery tank is made using vacuum.
Optionally, the power source is a cryogenic pump or a compressor.
Optionally, the low-temperature standard tank, the first pneumatic valve, the second pneumatic valve, the first quick link valve group, the second quick link valve group, and the to-be-detected meter are commonly disposed on the electronic balance.
The invention also provides a non-constant-current low-temperature static mass method verification method, which uses the non-constant-current low-temperature static mass method verification device and comprises the following steps:
closing the second pneumatic valve, the third pneumatic valve and the fifth pneumatic valve, opening the first pneumatic valve, the fourth pneumatic valve, the first quick link valve group and the second quick link valve group, and starting the power source to enable cryogenic liquid to flow from the cryogenic storage tank to the cryogenic standard tank until the cryogenic standard tank is full;
close fourth pneumatic valve first link valves fast second link valves fast third pneumatic valve fifth pneumatic valve opens first pneumatic valve second pneumatic valve for cryogenic liquids follows the low temperature standard jar passes through first pneumatic valve flows through examined the table, the rethread second pneumatic valve gets into retrieve the jar, adjust the pressure of second pneumatic valve and examination jar when flow reachs the examination flow point, the record electronic balance's weighing value Q1ijAnd counting the output pulse number of the detected meter, closing the second pneumatic valve when the weight of the low-temperature standard tank is reduced to a preset value, and recording the weighing value Q2 of the electronic balanceijAnd end count Nij；
When the liquid level inside the recovery tank reaches the preset height, the third pneumatic valve and the fifth pneumatic valve are opened, the power source is started, the recovered liquid enters the deep cooling tank to be cooled, and the low-temperature liquid after being cooled is recovered to the low-temperature storage tank.
Optionally, the formula for calculating the cumulative flow measured at the ith check point of the non-constant-current low-temperature static mass spectrometry calibration device for the jth measurement is as follows:
(Qs)ij＝Q1ij-Q2ij
the calculation formula of the cumulative mass flow measured at the ith detection point of the table to be detected for the jth time is as follows:
the error calculation formula for a single assay is as follows:
wherein Q isij(Q) cumulative mass flow measured for the jth measurement at the ith measurement point of said table under tests)ijAnd the cumulative flow measured at the ith check point of the non-constant-current low-temperature static mass method calibration device for the jth time.
The invention has the following beneficial effects:
the invention provides a non-constant-current low-temperature static mass method calibrating device which comprises a low-temperature standard tank, an electronic balance, a deep cooling tank, a low-temperature storage tank, a recovery tank, a power source, a first pneumatic valve, a second pneumatic valve, a third pneumatic valve, a fourth pneumatic valve, a fifth pneumatic valve, a first quick link valve group, a second quick link valve group and a to-be-inspected meter. The non-constant-flow low-temperature static mass method calibrating device provided by the invention has the advantages that in order to ensure the temperature of the recovered liquid, the recovered liquid is cooled through the deep cooling tank and then enters the low-temperature storage tank, so that the liquid is prevented from being gasified, and the frosting of a pipeline and an outlet is also avoided. In addition, the pipeline provided by the invention adopts a vacuum pipeline, and other parts are subjected to heat preservation treatment to prevent liquid gas.
Drawings
Fig. 1 is a schematic structural diagram of a non-constant-current low-temperature static mass method calibration apparatus provided in an embodiment of the present invention.
Fig. 2 is a schematic state diagram of a non-constant-current low-temperature static mass method calibration apparatus according to an embodiment of the present invention.
Fig. 3 is another schematic state diagram of the non-constant-current low-temperature static mass spectrometry calibration apparatus according to the first embodiment of the present invention.
Fig. 4 is a schematic diagram of a non-constant-current low-temperature static mass method calibration apparatus according to a first embodiment of the present invention.
Fig. 5 is a block diagram of a non-constant-current low-temperature static mass method calibration apparatus according to a first embodiment of the present invention.
Wherein the reference numerals are: the system comprises a low-temperature standard tank-1, an electronic balance-2, a deep cooling tank-3, a low-temperature storage tank-4, a recovery tank-5, a power source-6, a first pneumatic valve-11, a second pneumatic valve-12, a third pneumatic valve-13, a fourth pneumatic valve-14, a fifth pneumatic valve-15, a first quick link valve group-16, a second quick link valve group-17 and a detected meter-20.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following describes in detail the non-constant-current low-temperature static mass method calibration apparatus and method provided by the present invention with reference to the accompanying drawings.
Example one
Fig. 1 is a schematic structural diagram of a non-constant-current low-temperature static mass method calibration apparatus provided in an embodiment of the present invention. Fig. 2 is a schematic state diagram of a non-constant-current low-temperature static mass method calibration apparatus according to an embodiment of the present invention. Fig. 3 is another schematic state diagram of the non-constant-current low-temperature static mass spectrometry calibration apparatus according to the first embodiment of the present invention. As shown in fig. 1 to 3, the present embodiment provides a non-constant-flow low-temperature static mass method calibration apparatus, which includes a low-temperature standard tank 1, an electronic balance 2, a cryogenic tank 3, a low-temperature storage tank 4, a recovery tank 5, a power source 6, a first pneumatic valve 11, a second pneumatic valve 12, a third pneumatic valve 13, a fourth pneumatic valve 14, a fifth pneumatic valve 15, a first fast link valve set 16, a second fast link valve set 17, and a to-be-checked meter 20. The static mass method calibrating installation of non-constant current low temperature that this embodiment provided, for the temperature of ensureing to retrieve liquid, retrieve liquid and at first cool down through the cryogenic tank, then get into the low temperature storage tank to prevent liquid gasification, also avoid pipeline and export to frost. In addition, the pipeline provided by the embodiment adopts a vacuum pipeline, and the other parts are subjected to heat preservation treatment to prevent liquid gas.
In this embodiment, the low-temperature standard tank 1 is arranged on the electronic balance 2, the low-temperature standard tank 1 is used for storing low-temperature media for verification, the low-temperature standard tank 1 is made of a vacuum tank, the electronic balance 2 is used for weighing weight changes of the media and providing standard weight, one end of the low-temperature standard tank 1 is connected with the low-temperature storage tank 4 through the second quick link valve set 17, the other end of the low-temperature standard tank 1 is connected with one end of the to-be-detected meter 20 through the first pneumatic valve 11, the other end of the to-be-detected meter 20 extends into the inner space of the recovery tank 5 through the second pneumatic valve set 12, and the other end of the to-be-detected meter 20 is connected with the power source 6 through the first quick link valve set 16.
Fig. 4 is a schematic diagram of a non-constant-current low-temperature static mass method calibration apparatus according to a first embodiment of the present invention. Fig. 5 is a block diagram of a non-constant-current low-temperature static mass method calibration apparatus according to a first embodiment of the present invention. As shown in fig. 4 and 5, the lower position of the recovery tank 5 is connected to one end of the cryogenic tank 3, the recovery tank 5 is used for storing the intermediate liquid used for verification, the other end of the cryogenic tank 3 is connected to the power source 6 through the third pneumatic valve 13, the cryogenic tank 3 is used for cooling the recovered liquid, the cryogenic tank 4 is connected to the power source 6 through the fourth pneumatic valve 14 and the fifth pneumatic valve 15, the cryogenic tank 4 is used for providing the cryogenic liquid required for verification, and the pneumatic valves are used for changing the flow direction of the medium in the pipeline.
In this embodiment, the shell of cryogenic tank 3 uses the vacuum preparation, the shell of retrieving jar 5 uses the vacuum preparation, power supply 6 is cryogenic pump or compressor, low temperature standard jar 1 with first pneumatic valve 11, second pneumatic valve 12 first quick-link valves 16 the second quick-link valves 17 with examined table 20 sets up jointly on electronic balance 2.
The low-temperature standard tank provided by the embodiment is used for storing a low-temperature medium for verification, and is made of a vacuum tank. The electronic balance is used for weighing the weight change of the medium and providing standard weight. The deep cooling tank is used for cooling the recovered liquid, and the shell of the deep cooling tank is made in a vacuum mode. The low-temperature storage tank is used for providing low-temperature liquid required by verification, the recovery tank is used for storing intermediate liquid for verification, and the shell of the recovery tank is made in a vacuum mode. The power source is a cryogenic pump or a compressor. The pneumatic valve provided by the embodiment changes the flow direction of the medium in the pipeline as required.
The non-constant-current low-temperature static mass method calibrating device comprises a low-temperature standard tank, an electronic balance, a deep cooling tank, a low-temperature storage tank, a recovery tank, a power source, a first pneumatic valve, a second pneumatic valve, a third pneumatic valve, a fourth pneumatic valve, a fifth pneumatic valve, a first quick link valve group, a second quick link valve group and a to-be-inspected meter. The static mass method calibrating installation of non-constant current low temperature that this embodiment provided, for the temperature of ensureing to retrieve liquid, retrieve liquid and at first cool down through the cryogenic tank, then get into the low temperature storage tank to prevent liquid gasification, also avoid pipeline and export to frost. In addition, the pipeline provided by the embodiment adopts a vacuum pipeline, and the other parts are subjected to heat preservation treatment to prevent liquid gas.
Example two
The present embodiment provides a non-constant-current low-temperature static mass method calibration method, where the non-constant-current low-temperature static mass method calibration device provided in the first embodiment is used in the non-constant-current low-temperature static mass method calibration method, and specific contents may refer to the description in the first embodiment, and are not described here again.
Referring to fig. 2, the present embodiment closes the second pneumatic valve 12, the third pneumatic valve 13, and the fifth pneumatic valve 15, opens the first pneumatic valve 11, the fourth pneumatic valve 14, the first quick-link valve set 16, and the second quick-link valve set 17, and starts the power source 6, so that the cryogenic liquid flows from the cryogenic storage tank 4 to the cryogenic standard tank 1 until the cryogenic standard tank 1 is filled. The static mass method calibrating installation of non-constant current low temperature that this embodiment provided, for the temperature of ensureing to retrieve liquid, retrieve liquid and at first cool down through the cryogenic tank, then get into the low temperature storage tank to prevent liquid gasification, also avoid pipeline and export to frost. In addition, the pipeline provided by the embodiment adopts a vacuum pipeline, and the other parts are subjected to heat preservation treatment to prevent liquid gas.
Referring to fig. 3, in the embodiment, the fourth pneumatic valve 14, the first quick link valve set 16, the second quick link valve set 17, the third pneumatic valve 13 and the fifth pneumatic valve 15 are closed, the first pneumatic valve 11 and the second pneumatic valve 12 are opened, so that the cryogenic liquid flows from the cryogenic standard tank 1 through the first pneumatic valve 11, the examined meter 20, then through the second pneumatic valve 12, enters the recovery tank 5, the pressure of the second pneumatic valve 12 and the examined tank is adjusted, and when the flow reaches the examined flow point, the weighing value Q1 of the electronic balance 2 is recordedijAnd counting the number of pulses output by the detected meter 20, closing the second pneumatic valve 12 when the weight of the low-temperature standard tank 1 is reduced to a preset value, and recording the weighing value Q2 of the electronic balance 2ijAnd end count Nij。
Referring to fig. 4, when the liquid level inside the recovery tank 5 reaches a preset height, the third pneumatic valve 13 and the fifth pneumatic valve 15 are opened, the power source 6 is started, the recovered liquid enters the cryogenic tank 3 for cooling, and the cooled cryogenic liquid is recovered into the cryogenic storage tank 4. The calculation formula of the cumulative flow measured at the ith check point of the non-constant-current low-temperature static mass method calibration device for the jth measurement is as follows:
(Qs)ij＝Q1ij-Q2ij
the formula for calculating the cumulative mass flow measured at the ith detection point of the table 20 for the jth time is as follows:
the error calculation formula for a single assay is as follows:
wherein Q isij(Q) cumulative mass flow measured for the jth measurement at the ith measurement point of said table 20s)ijAnd the cumulative flow measured at the ith check point of the non-constant-current low-temperature static mass method calibration device for the jth time.
The steps of the standard tank liquid inlet flow path and the flow meter precooling provided by the embodiment are as follows:
and closing the second pneumatic valve, the third pneumatic valve and the fifth pneumatic valve, opening the first pneumatic valve, the fourth pneumatic valve, the first quick link valve bank and the second quick link valve bank, starting a power source, enabling the low-temperature liquid to flow to the standard tank from the low-temperature storage tank, and filling the standard tank with the low-temperature liquid. In the process, precooling work on the flow meter is completed.
The flow meter verification provided by the embodiment comprises the following steps:
closing a fourth pneumatic valve, a first quick link valve set, a second quick link valve set, a third pneumatic valve and a fifth pneumatic valve, opening the first pneumatic valve and the second pneumatic valve, enabling the low-temperature liquid to flow through the inspected meter from the standard tank and then enter the recovery tank through the second pneumatic valve, and simultaneously recording the current weighing value Q1 by the control system when the flow reaches the verification flow point through the pressure of the second pneumatic valve and the verification tankijAnd counting (counting the output pulse number of the detected meter), stopping the second pneumatic valve when the weight of the standard tank is reduced to a preset value, and recording a weighing value Q2ijAnd end count Nij. And finishing the verification once. When the liquid level in the recovery tank reaches a certain height, the third pneumatic valve and the fifth pneumatic valve are opened, the power source is started, and the low-temperature liquid is recovered to the storage tankIn order to ensure the temperature of the recovered liquid, the recovered liquid enters a cryogenic tank to be cooled and then enters a storage tank.
Referring to fig. 4, the cumulative flow (kg) measured by the ith calibration point for the jth calibration device is:
(Qs)ij＝Q1ij-Q2ij
the accumulated mass flow (kg) measured by the jth detected flowmeter at the ith detection point is as follows:
the error of a single assay is:
the low-temperature standard tank provided by the embodiment is installed on an electronic balance together with a first pneumatic valve, a second pneumatic valve, a first quick link valve group, a second quick link valve group and a to-be-detected meter. The pipeline adopts a vacuum pipeline, and other parts are subjected to heat preservation treatment to prevent liquid gas. The Coriolis mass flowmeter has no requirement on the front and rear straight pipe sections, and the used pipe is as short as possible.
In the non-constant-flow low-temperature static mass method calibration method provided by the embodiment, the non-constant-flow low-temperature static mass method calibration device comprises a low-temperature standard tank, an electronic balance, a deep cooling tank, a low-temperature storage tank, a recovery tank, a power source, a first pneumatic valve, a second pneumatic valve, a third pneumatic valve, a fourth pneumatic valve, a fifth pneumatic valve, a first quick link valve group, a second quick link valve group and a to-be-checked meter. The static mass method calibrating installation of non-constant current low temperature that this embodiment provided, for the temperature of ensureing to retrieve liquid, retrieve liquid and at first cool down through the cryogenic tank, then get into the low temperature storage tank to prevent liquid gasification, also avoid pipeline and export to frost. In addition, the pipeline provided by the embodiment adopts a vacuum pipeline, and the other parts are subjected to heat preservation treatment to prevent liquid gas.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (7)
1. A non-constant-current low-temperature static mass method calibrating device is characterized by comprising a low-temperature standard tank, an electronic balance, a deep cooling tank, a low-temperature storage tank, a recovery tank, a power source, a first pneumatic valve, a second pneumatic valve, a third pneumatic valve, a fourth pneumatic valve, a fifth pneumatic valve, a first quick link valve group, a second quick link valve group and a to-be-inspected meter;
the low-temperature standard tank is arranged on the electronic balance and used for storing low-temperature media used for verification, the low-temperature standard tank is made of a vacuum tank, the electronic balance is used for weighing weight changes of the media and providing standard weight, one end of the low-temperature standard tank is connected with the low-temperature storage tank through the second quick link valve group, the other end of the low-temperature standard tank is connected with one end of the meter to be detected through the first pneumatic valve, the other end of the meter to be detected extends into the inner space of the recovery tank through the second pneumatic valve, and the other end of the meter to be detected is connected with the power source through the first quick link valve group;
the lower part position of retrieving the jar with the one end of cryogenic tank is connected, retrieve the jar and be used for storing the used middle liquid of examination, the other end of cryogenic tank passes through third pneumatic valve with the power supply is connected, the cryogenic tank is used for retrieving the liquid cooling, the low temperature storage tank passes through respectively the fourth pneumatic valve with fifth pneumatic valve with the power supply is connected, the low temperature storage tank is used for providing the low temperature liquid that the examination needs, the pneumatic valve is used for changing the flow direction of medium in the pipeline.
2. The non-constant flow low temperature static mass spectrometry verification device of claim 1, wherein the housing of the cryogenic tank is made using vacuum.
3. The non-constant flow low temperature static mass spectrometry verification device of claim 1, wherein the housing of the recovery tank is made using vacuum.
4. The non-constant-flow low-temperature static mass method calibrating device according to claim 1, wherein the power source is a cryopump or a compressor.
5. The non-constant-flow low-temperature static mass method calibrating device according to claim 1, wherein the low-temperature standard tank, the first pneumatic valve, the second pneumatic valve, the first quick link valve group, the second quick link valve group and the to-be-tested meter are arranged on the electronic balance together.
6. A non-constant-current low-temperature static mass method verification method, which is characterized by using the non-constant-current low-temperature static mass method verification device of any one of claims 1 to 5, and comprises the following steps:
closing the second pneumatic valve, the third pneumatic valve and the fifth pneumatic valve, opening the first pneumatic valve, the fourth pneumatic valve, the first quick link valve group and the second quick link valve group, and starting the power source to enable cryogenic liquid to flow from the cryogenic storage tank to the cryogenic standard tank until the cryogenic standard tank is full;
close the fourth pneumatic valve, first quick link valves, second quick link valves, third pneumatic valve, fifth pneumatic valve, open first pneumatic valve second pneumatic valve for low temperature liquid is followed the low temperature standard jar passes through first pneumatic valve flows through the examined table, the rethread second pneumatic valve gets into retrieve the jar, adjust the jarThe pressure of the second pneumatic valve and the verification tank is recorded when the flow reaches the verification flow point, and the weighing value Q1 of the electronic balance is recordedijAnd counting the output pulse number of the detected meter, closing the second pneumatic valve when the weight of the low-temperature standard tank is reduced to a preset value, and recording the weighing value Q2 of the electronic balanceijAnd end count Nij；
When the liquid level inside the recovery tank reaches the preset height, the third pneumatic valve and the fifth pneumatic valve are opened, the power source is started, the recovered liquid enters the deep cooling tank to be cooled, and the low-temperature liquid after being cooled is recovered to the low-temperature storage tank.
7. The non-constant-current low-temperature static mass method calibration method according to claim 6, wherein the calculation formula of the cumulative flow measured at the ith calibration point of the non-constant-current low-temperature static mass method calibration device for the jth measurement is as follows:
(Qs)ij＝Q1 ij-Q2ij
the calculation formula of the cumulative mass flow measured at the ith detection point of the table to be detected for the jth time is as follows:
the error calculation formula for a single assay is as follows:
wherein Q isij(Q) cumulative mass flow measured for the jth measurement at the ith measurement point of said table under tests)ijAnd the cumulative flow measured at the ith check point of the non-constant-current low-temperature static mass method calibration device for the jth time.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113607246A (en) * | 2021-07-30 | 2021-11-05 | 中国科学院合肥物质科学研究院 | Calibration device and method for low-temperature flowmeter |
| CN114087525A (en) * | 2021-11-09 | 2022-02-25 | 浙江浙能技术研究院有限公司 | Air pressure driven differential mass method liquid hydrogen accumulated flow standard device |
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2021
- 2021-02-11 CN CN202110184647.4A patent/CN112903068A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113607246A (en) * | 2021-07-30 | 2021-11-05 | 中国科学院合肥物质科学研究院 | Calibration device and method for low-temperature flowmeter |
| CN113607246B (en) * | 2021-07-30 | 2022-07-26 | 中国科学院合肥物质科学研究院 | Calibration device and method for low-temperature flowmeter |
| CN114087525A (en) * | 2021-11-09 | 2022-02-25 | 浙江浙能技术研究院有限公司 | Air pressure driven differential mass method liquid hydrogen accumulated flow standard device |
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