CN103697974A - Verifying device and verifying method of liquid metal flowmeter - Google Patents
Verifying device and verifying method of liquid metal flowmeter Download PDFInfo
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- CN103697974A CN103697974A CN201410004959.2A CN201410004959A CN103697974A CN 103697974 A CN103697974 A CN 103697974A CN 201410004959 A CN201410004959 A CN 201410004959A CN 103697974 A CN103697974 A CN 103697974A
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Abstract
The invention relates to a device and a method for verifying or correcting instrument equipment for measuring the flow rate. In order to solve the problems of low verification accuracy, narrow verification range, low safety and the like of an existing verifying device and verifying method of a liquid metal flowmeter, the invention provides a verifying device and a verifying method of a liquid metal flowmeter. The device comprises a storage tank, a heater, an electromagnetic pump, a main measuring cylinder, an auxiliary measuring cylinder, a preheater, a liquid metal flowmeter connector A, a liquid metal flowmeter connector B and a vapor trap. The verifying method employing the verifying device is used for verifying different measuring ranges of the liquid metal flowmeter in a segmental verifying mode. The verifying device of the liquid metal flowmeter provided by the invention is an original standard device, is capable of realizing actual flow verification on the transfer flow magnitude or the test accuracy of the liquid metal flowmeter, and is high in verification accuracy, large in verification measuring range, high in safety, low in cost and excellent in applicability.
Description
Technical field
The present invention relates to a kind of calibrating or means for correcting and method of the instrumentation for measuring flow, particularly a kind of liquid metal flow gauge checking apparatus and method of calibration.
Background technology
Flow standard device can be divided into primary standard device and the large class of Transfer Standards device two by value traceability system.Primary standard device is to utilize the comprehensive flow of deriving of fundamental quantity length (deriving as volume) or quality and time, compares with the Transfer Standards device that utilizes proving flowmeter to do transmission of quantity value, and primary standard device precision is high, and system forms complicated, and investment is large.Conventionally, flow measurement research institution and there is fairly large flow-meter plant and all take and primary standard device is set as main.
For liquid metal flowmeter (as: magneto, electromagnetic type, differential pressure type etc.), its operation working medium comprises the multiple liquid metal materials such as lithium, sodium, Na-K alloy, lead, lead bismuth alloy, Li-Pb alloy, mercury, and the working temperature of these liquid metal materials is often over 600 ℃, meeting air can be oxidized, and some is met water and also can blast.Existence due to these reasons, in prior art, lack applicable liquid metal flow standard device, therefore flow-meter plant conventionally only provides with theory and is derived as basic flow when liquid metal flowmeter dispatches from the factory, for example by magnetic flux density and working medium physical property, carry out the flow that relational expression derivation draws permanent magnet flowmeter, its degree of accuracy is lower (being greater than 5%) conventionally, generally only can, as monitoring level Instrument use, cannot realize the real stream verification that liquid metal flowmeter transmits flowrate measurement value or testing precision.
At present, because metrological services at different levels of country all do not set up liquid metal flow gauge checking apparatus, the verification of liquid metal flowmeter can only be completed voluntarily by applying unit, therefore to realize the real stream verification that liquid metal flowmeter transmits flowrate measurement value or testing precision, just must design a set of applicable liquid metal flow gauge checking apparatus and method of calibration.
Summary of the invention
For the problem such as solve existing liquid metal flow gauge checking apparatus and method of calibration verification degree of accuracy is not high, verification range is narrower, security is lower, the invention provides a kind of liquid metal flow gauge checking apparatus and method of calibration.
A liquid metal flow gauge checking apparatus, comprises storage tank, well heater, electromagnetic pump, main graduated cylinder, secondary graduated cylinder, primary heater, liquid metal flowmeter interface A, liquid metal flowmeter interface B, vapor trap;
In vertical direction, storage tank is arranged on minimum point, and secondary graduated cylinder bottom is higher than storage tank top, and main graduated cylinder bottom is higher than secondary graduated cylinder top;
Described main graduated cylinder and secondary graduated cylinder are closed container, are equipped with entrance, outlet at bottom and overflow vent, and inside all adopts the anti-fluctuation measure of liquid level, the liquid fluctuating of liquid metal while preventing from holding liquid metal;
Described liquid metal flowmeter interface A and liquid metal flowmeter interface B are not when liquid metal flowmeter accesses and can make pipeline connection, and when liquid metal flowmeter accesses, can make liquid metal flowmeter be connected on the interface in pipeline;
Described primary heater is distributed in all positions that this liquid metal flow gauge checking apparatus liquid metal in whole checking procedure may exist;
Described calorifier inlets end is connected with storage tank by the pipeline with valve V1, and storage tank inside is stretched in one end that this pipeline is connected with storage tank; Heater outlet end is connected with electromagnetic pump inlet end by pipeline;
Electromagnetic pump endpiece is connected with one end of liquid metal flowmeter interface A by pipeline, the other end of liquid metal flowmeter interface A is connected with one end of main graduated cylinder entrance and liquid metal flowmeter interface B respectively by the pipeline with valve V3 and with the pipeline of valve V2, and this end of liquid metal flowmeter interface B is also connected with main graduated cylinder outlet at bottom by the pipeline with valve V4;
The other end of liquid metal flowmeter interface B is connected with secondary graduated cylinder entrance by the pipeline with valve V5;
Main graduated cylinder overflow vent is connected by pipeline with secondary graduated cylinder overflow vent, connects main graduated cylinder overflow vent and also by the pipeline with valve V8, is connected with storage tank with the pipeline of secondary graduated cylinder overflow vent;
Secondary graduated cylinder outlet at bottom is connected with storage tank and calorifier inlets end respectively by the pipeline with valve V6 and with the pipeline of valve V7;
Storage tank top is also connected with one end of vapor trap by pipeline, and the other end of vapor trap is connected with the gas inlet-outlet of being controlled by valve;
All pipelines of lateral arrangement all adopt the angle of inclination of 2～6 degree to flow back to storage tank to be conducive to liquid metal.
Valve V1, the V4 of described liquid metal flow gauge checking apparatus, V6, V7, V8 are preferably pneumatic stopping valve.
The valve V2 of described liquid metal flow gauge checking apparatus is preferably electric check valve.
Valve V3, the V5 of described liquid metal flow gauge checking apparatus are preferably electric control valve.
It is preferably that the storage tank of described liquid metal flow gauge checking apparatus, well heater, electromagnetic pump, main graduated cylinder, secondary graduated cylinder, all pipelines and valvular material all adopt stainless steel, is beneficial to liquid metal compatible.
Adopt a method of calibration for above-mentioned liquid metal flow gauge checking apparatus, the method adopts the different ranges of segmentation checking mode liquid towards metal flow meter to carry out verification, specific as follows:
(1) 1.0m
3the following range of/h adopts the verification mode of the accurate volumetric method of segregation drive level pressure leader to carry out verification, and (1) its step comprise-(7);
(1) liquid metal flowmeter to be verified is arranged on to liquid metal flowmeter interface B, liquid metal flowmeter to be verified is connected in pipeline, the pipeline at liquid metal flowmeter interface A place keeps being communicated with, and then whole device is carried out to airtight test;
(2) heater and primary heater, be heated above the temperature of this liquid metal flow gauge checking apparatus all positions that liquid metal may exist in whole checking procedure the fusing point of adopted liquid metal;
(3) valve-off V6, V7, V8 and V2, Open valve V1, V3, V4, V5 and gas inlet-outlet valve, by passing into inert gas to gas inlet-outlet, liquid metal is pressed into electromagnetic pump, open electromagnetic pump, Open valve V6 and V8, set up successively the circulation through valve V3, main graduated cylinder, valve V4, liquid metal flowmeter to be verified, valve V5, secondary graduated cylinder, valve V6, and make the liquid metal flow of electromagnetic pump outlet be greater than 2m
3/ h;
(4) adjust well heater and primary heater, make temperature constant temperature in whole checking procedure of liquid metal in this liquid metal flow gauge checking apparatus temperature required in verification;
(5) close gradually minor valve V5, make main graduated cylinder produce overflow, now, in liquid metal flowmeter to be verified upstream, by liquid metal gravity, produce stable drive ram, continue to close minor valve V5, make to equal required checking flow value by the liquid metal flow of valve V5;
(6) valve-off V6, the liquid level of liquid metal in secondary graduated cylinder raises gradually, liquid metal dilatation and time used in the secondary graduated cylinder of minute segment record, obtain liquid metal flow, be liquid metal flowmeter flow to be verified, then open valve V6, discharge the liquid metal in secondary graduated cylinder;
Repeating step (4)～(6) one or many, average;
(2) 1.5m
3the above range of/h adopts electromagnetic pump to drive the verification mode of the accurate volumetric method of level pressure leader to carry out verification, and (8) its step comprise-(13);
(8) liquid metal flowmeter to be verified is arranged on to liquid metal flowmeter interface A, liquid metal flowmeter to be verified is connected in pipeline, the pipeline at liquid metal flowmeter interface B place keeps being communicated with, and then whole device is carried out to airtight test;
(9) heater and primary heater, be heated above the temperature of this liquid metal flow gauge checking apparatus all positions that liquid metal may exist in whole checking procedure the fusing point of adopted liquid metal;
(10) valve-off V6, V7, V8 and V2, Open valve V1, V3, V4, V5 and gas inlet-outlet valve, by passing into inert gas to gas inlet-outlet, liquid metal is pressed into electromagnetic pump, open electromagnetic pump, Open valve V6 and V8, set up successively the circulation through liquid metal flowmeter to be verified, valve V3, main graduated cylinder, valve V4, valve V5, secondary graduated cylinder, valve V6;
(11) the liquid metal flow of electromagnetic pump outlet is adjusted to required checking flow value, adjusts well heater and primary heater, make temperature constant temperature in whole checking procedure of liquid metal in this liquid metal flow gauge checking apparatus temperature required in verification;
(12) valve-off V4, the liquid level of liquid metal in main graduated cylinder raises gradually, liquid metal dilatation and time used in minute main graduated cylinder of segment record, obtain liquid metal flow, be liquid metal flowmeter flow to be verified, then open valve V4, discharge the liquid metal in main graduated cylinder;
Repeating step (11)～(12) one or many, average;
(3) when the range of required verification is at 1.0～1.5m
3in the time of within the scope of/h, verification mode is selected a kind of in (one) or (two) two kinds of verification modes.
When needs liquid towards metal flow meter carries out comprehensive verification, can, by changing the temperature required and required checking flow value of corresponding verification in this method of calibration, obtain required liquid metal flowmeter checking data to be verified.
Liquid metal flow gauge checking apparatus of the present invention has adopted different verification modes for different ranges, wherein, small-range adopts the accurate volumetric method of segregation drive level pressure leader to carry out verification, wide range adopts electromagnetic pump to drive the accurate volumetric method of level pressure leader to carry out verification, such design makes this calibration equipment possess very large verification range, and the verification degree of accuracy that had both guaranteed small-range, while having guaranteed again wide range, calibration equipment possesses lower overall height.Harm is directly proportional due to liquid metal system height and after leaking, so the reduction of overall height significantly improved the security of calibration equipment, and therefore such design has also taken into account degree of accuracy and the security of calibration equipment.
Meanwhile, the overall construction design of liquid metal flow gauge checking apparatus of the present invention is reasonable, effectively reduces unit scale, and the security of calibration equipment and economy are taken into account.The vapor trap adopting is used for preventing that liquid metal steam from assembling in liquid metal flow gauge checking apparatus, in order to avoid affect verification.
Liquid metal flow gauge checking apparatus of the present invention belongs to primary standard device, can realize the real stream verification that liquid metal flowmeter transmits flowrate measurement value or testing precision.Adopt liquid metal flow gauge checking apparatus of the present invention and method of calibration liquid towards metal flow meter to carry out verification, its verification degree of accuracy is high, and whole school tests in range ability and is better than 1%, while adopting the accurate volumetric method verification of segregation drive level pressure leader, is better than 0.5%; Verification range is large, and maximum verification range is greater than 150 with the ratio of minimum verification range; Calibration equipment is safe, and cost is lower, and has good applicability.
Accompanying drawing explanation
Fig. 1 liquid metal flow gauge checking apparatus of the present invention schematic diagram
Reference numeral: 1. storage tank, 2. valve V1,3. well heater, 4. electromagnetic pump, 5. liquid metal flowmeter interface A, 6. valve V2,7. valve V3,8. main measuring tank, 9. valve V4,10. liquid metal flowmeter interface B, 11. valve V5,12. secondary graduated cylinders, 13. valve V6,14. valve V7,15. valve V8,16. vapor traps, 17. gas inlet-outlet
Embodiment
Below in conjunction with specific embodiment, embodiments of the present invention are described further.
Embodiment
Adopt liquid metal flow gauge checking apparatus of the present invention and method of calibration to carry out verification to certain magneto liquid metal flowmeter, the liquid metal adopting is sodium, and verification range is 0.2-2.0m
3/ h, verification is temperature required is respectively 200 ℃, 300 ℃, 400 ℃, and required checking flow value is respectively 0.2m
3/ h, 0.5m
3/ h, 0.8m
3/ h, 1.1m
3/ h, 1.4m
3/ h, 1.7m
3/ h, 2.0m
3/ h.
Wherein: 1.2m
3the following range of/h adopts the verification mode of the accurate volumetric method of segregation drive level pressure leader to carry out verification, repeating step (4)～(6) once; 1.2m
3the above range of/h adopts electromagnetic pump to drive the verification mode of the accurate volumetric method of level pressure leader to carry out verification, repeating step (11)～(12) once.
Check results demonstration, liquid metal flow gauge checking apparatus of the present invention and method of calibration verification degree of accuracy are high, and data consistency is good, calibration equipment safe and applicable, stable performance, easy to operate.
Claims (7)
1. a liquid metal flow gauge checking apparatus, is characterized in that: this device comprises storage tank, well heater, electromagnetic pump, main graduated cylinder, secondary graduated cylinder, primary heater, liquid metal flowmeter interface A, liquid metal flowmeter interface B, vapor trap;
In vertical direction, storage tank is arranged on minimum point, and secondary graduated cylinder bottom is higher than storage tank top, and main graduated cylinder bottom is higher than secondary graduated cylinder top;
Described main graduated cylinder and secondary graduated cylinder are closed container, are equipped with entrance, outlet at bottom and overflow vent, and inside all adopts the anti-fluctuation measure of liquid level, the liquid fluctuating of liquid metal while preventing from holding liquid metal;
Described liquid metal flowmeter interface A and liquid metal flowmeter interface B are not when liquid metal flowmeter accesses and can make pipeline connection, and when liquid metal flowmeter accesses, can make liquid metal flowmeter be connected on the interface in pipeline;
Described primary heater is distributed in all positions that this liquid metal flow gauge checking apparatus liquid metal in whole checking procedure may exist;
Described calorifier inlets end is connected with storage tank by the pipeline with valve V1, and storage tank inside is stretched in one end that this pipeline is connected with storage tank; Heater outlet end is connected with electromagnetic pump inlet end by pipeline;
Electromagnetic pump endpiece is connected with one end of liquid metal flowmeter interface A by pipeline, the other end of liquid metal flowmeter interface A is connected with one end of main graduated cylinder entrance and liquid metal flowmeter interface B respectively by the pipeline with valve V3 and with the pipeline of valve V2, and this end of liquid metal flowmeter interface B is also connected with main graduated cylinder outlet at bottom by the pipeline with valve V4;
The other end of liquid metal flowmeter interface B is connected with secondary graduated cylinder entrance by the pipeline with valve V5;
Main graduated cylinder overflow vent is connected by pipeline with secondary graduated cylinder overflow vent, connects main graduated cylinder overflow vent and also by the pipeline with valve V8, is connected with storage tank with the pipeline of secondary graduated cylinder overflow vent;
Secondary graduated cylinder outlet at bottom is connected with storage tank and calorifier inlets end respectively by the pipeline with valve V6 and with the pipeline of valve V7;
Storage tank top is also connected with one end of vapor trap by pipeline, and the other end of vapor trap is connected with the gas inlet-outlet of being controlled by valve;
All pipelines of lateral arrangement all adopt the angle of inclination of 2～6 degree to flow back to storage tank to be conducive to liquid metal.
2. liquid metal flow gauge checking apparatus as claimed in claim 1, is characterized in that: valve V1, the V4 of described liquid metal flow gauge checking apparatus, V6, V7, V8 are pneumatic stopping valve.
3. liquid metal flow gauge checking apparatus as claimed in claim 1, is characterized in that: the valve V2 of described liquid metal flow gauge checking apparatus is electric check valve.
4. liquid metal flow gauge checking apparatus as claimed in claim 1, is characterized in that: valve V3, the V5 of described liquid metal flow gauge checking apparatus is electric control valve.
5. liquid metal flow gauge checking apparatus as claimed in claim 1, is characterized in that: the storage tank of described liquid metal flow gauge checking apparatus, well heater, electromagnetic pump, main graduated cylinder, secondary graduated cylinder, all pipelines and valvular material all adopt stainless steel.
6. a method of calibration for liquid metal flow gauge checking apparatus as claimed in claim 1, is characterized in that the method adopts the different ranges of segmentation checking mode liquid towards metal flow meter to carry out verification, specific as follows:
(1) 1.0m
3the following range of/h adopts the verification mode of the accurate volumetric method of segregation drive level pressure leader to carry out verification, and (1) its step comprise-(7);
(1) liquid metal flowmeter to be verified is arranged on to liquid metal flowmeter interface B, liquid metal flowmeter to be verified is connected in pipeline, the pipeline at liquid metal flowmeter interface A place keeps being communicated with, and then whole device is carried out to airtight test;
(2) heater and primary heater, be heated above the temperature of this liquid metal flow gauge checking apparatus all positions that liquid metal may exist in whole checking procedure the fusing point of adopted liquid metal;
(3) valve-off V6, V7, V8 and V2, Open valve V1, V3, V4, V5 and gas inlet-outlet valve, by passing into inert gas to gas inlet-outlet, liquid metal is pressed into electromagnetic pump, open electromagnetic pump, Open valve V6 and V8, set up successively the circulation through valve V3, main graduated cylinder, valve V4, liquid metal flowmeter to be verified, valve V5, secondary graduated cylinder, valve V6, and make the liquid metal flow of electromagnetic pump outlet be greater than 2m
3/ h;
(4) adjust well heater and primary heater, make temperature constant temperature in whole checking procedure of liquid metal in this liquid metal flow gauge checking apparatus temperature required in verification;
(5) close gradually minor valve V5, make main graduated cylinder produce overflow, now, in liquid metal flowmeter to be verified upstream, by liquid metal gravity, produce stable drive ram, continue to close minor valve V5, make to equal required checking flow value by the liquid metal flow of valve V5;
(6) valve-off V6, the liquid level of liquid metal in secondary graduated cylinder raises gradually, liquid metal dilatation and time used in the secondary graduated cylinder of minute segment record, obtain liquid metal flow, be liquid metal flowmeter flow to be verified, then open valve V6, discharge the liquid metal in secondary graduated cylinder;
Repeating step (4)～(6) one or many, average;
(2) 1.5m
3the above range of/h adopts electromagnetic pump to drive the verification mode of the accurate volumetric method of level pressure leader to carry out verification, and (8) its step comprise-(13);
(8) liquid metal flowmeter to be verified is arranged on to liquid metal flowmeter interface A, liquid metal flowmeter to be verified is connected in pipeline, the pipeline at liquid metal flowmeter interface B place keeps being communicated with, and then whole device is carried out to airtight test;
(9) heater and primary heater, be heated above the temperature of this liquid metal flow gauge checking apparatus all positions that liquid metal may exist in whole checking procedure the fusing point of adopted liquid metal;
(10) valve-off V6, V7, V8 and V2, Open valve V1, V3, V4, V5 and gas inlet-outlet valve, by passing into inert gas to gas inlet-outlet, liquid metal is pressed into electromagnetic pump, open electromagnetic pump, Open valve V6 and V8, set up successively the circulation through liquid metal flowmeter to be verified, valve V3, main graduated cylinder, valve V4, valve V5, secondary graduated cylinder, valve V6;
(11) the liquid metal flow of electromagnetic pump outlet is adjusted to required checking flow value, adjusts well heater and primary heater, make temperature constant temperature in whole checking procedure of liquid metal in this liquid metal flow gauge checking apparatus temperature required in verification;
(12) valve-off V4, the liquid level of liquid metal in main graduated cylinder raises gradually, liquid metal dilatation and time used in minute main graduated cylinder of segment record, obtain liquid metal flow, be liquid metal flowmeter flow to be verified, then open valve V4, discharge the liquid metal in main graduated cylinder;
Repeating step (11)～(12) one or many, average;
(3) when the range of required verification is at 1.0～1.5m
3in the time of within the scope of/h, verification mode is selected a kind of in (one) or (two) two kinds of verification modes.
7. the method for calibration of liquid metal flow gauge checking apparatus as claimed in claim 6, it is characterized in that: when needs liquid towards metal flow meter carries out comprehensive verification, by changing the temperature required and required checking flow value of corresponding verification in this method of calibration, obtain required liquid metal flowmeter checking data to be verified.
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| CN105526997A (en) * | 2015-12-29 | 2016-04-27 | 中国原子能科学研究院 | Calibration container, calibration circuit and calibration method of liquid metal flow gauge |
| CN108361187A (en) * | 2018-01-19 | 2018-08-03 | 西安交通大学 | A kind of electromagnetic pump comprehensive performance testing system and its application method |
| CN109297572A (en) * | 2018-12-14 | 2019-02-01 | 武汉普迪真空科技有限公司 | A kind of high temperature fluent metal liquid level sensor measurement calibration method |
| CN110715680A (en) * | 2018-07-11 | 2020-01-21 | 浙江大学 | Comprehensive experiment system for thermal performance of high-temperature molten fluid |
| CN113008336A (en) * | 2021-02-18 | 2021-06-22 | 合肥工业大学 | Method for realizing permanent magnet sodium flowmeter cross-correlation method in-situ calibration based on error correction |
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| CN110715680A (en) * | 2018-07-11 | 2020-01-21 | 浙江大学 | Comprehensive experiment system for thermal performance of high-temperature molten fluid |
| CN109297572A (en) * | 2018-12-14 | 2019-02-01 | 武汉普迪真空科技有限公司 | A kind of high temperature fluent metal liquid level sensor measurement calibration method |
| CN113008336A (en) * | 2021-02-18 | 2021-06-22 | 合肥工业大学 | Method for realizing permanent magnet sodium flowmeter cross-correlation method in-situ calibration based on error correction |
| CN113008336B (en) * | 2021-02-18 | 2022-07-12 | 重庆川仪自动化股份有限公司 | Method for realizing permanent magnet sodium flowmeter cross-correlation method in-situ calibration based on error correction |
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