CN105526997A - Calibration container, calibration circuit and calibration method of liquid metal flow gauge - Google Patents
Calibration container, calibration circuit and calibration method of liquid metal flow gauge Download PDFInfo
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- CN105526997A CN105526997A CN201511005784.8A CN201511005784A CN105526997A CN 105526997 A CN105526997 A CN 105526997A CN 201511005784 A CN201511005784 A CN 201511005784A CN 105526997 A CN105526997 A CN 105526997A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
- G01F25/17—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters using calibrated reservoirs
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Abstract
The invention belongs to the technical field of liquid metal flow measurement, and discloses a calibration container, a calibration circuit and a calibration method of a liquid metal flow gauge. The calibration container adopts a way that an inner cylinder, an outer cylinder, a rectifying device and the like are combined and can be used for calibrating the flow of liquid metal of which the flow is larger than 500 m<3>/h. According to the calibration circuit and the calibration method provided by the invention, the temperature of the liquid metal in a liquid metal circuit is enabled to meet the calibration requirement through measures of regulating a liquid metal circulating pump, the temperature of a buffer tank heater, an air cooler and the like; by controlling the liquid level difference of the liquid metal between a liquid level upper limit and a liquid level lower limit in a buffer tank to be 200 mm to 500 mm, the pressure of the liquid metal in the buffer tank when the liquid metal enters a liquid metal pump is enabled to be kept in a stable range, so that the precision of calibration of the liquid metal flow gauge is ensured.
Description
Technical field
The invention belongs to liquid metal flux field of measuring technique, be specifically related to a kind of liquid metal flux meter and demarcate container, demarcate loop and scaling method.
Background technology
Because the characteristics such as liquid metal is opaque, high temperature, electric conductivity are strong and character is active make traditional flow measurement technology be difficult to use.At present adopt magneto liquid metal flux meter, generally rule of thumb formula calculates its coefficient of flow by the mode measuring magnetic flux density more, and comparatively greatly, how more than ± 5%, domestic do not have mechanism and the facility that can provide calibration certificate to error yet.
Illustrate for the Typical Representative sodium in liquid metal, sodium cold drop formula fast reactor is heap-type with fastest developing speed in forth generation reactor type, and liquid metal sodium is selected as the coolant material of fast neutron reactor owing to having good thermal conduction characteristic and neutrons characteristic.The fusing point of sodium about 98 DEG C, its normal operating temperature scope is 150 DEG C ~ 600 DEG C.The open source literature that existing sodium flowmeter prover is relevant with method has: a kind of liquid metal flux demarcates container (application number is CN201410783742.6), a kind of high-temperature liquid metal flow on-line proving device (application number is CN201210209956.3) and a kind of liquid metal flux meter checking device and method of calibration (application number is CN201410004959.2), the caliberating device that above-mentioned 3 patents provide or method are all the increases with tank fill level in calibration process, loop back pressure increases, and is therefore only applicable to low discharge (several m
3/ h) flow calibration of metallic solution.Because to large discharge sodium solution timing signal (about 500m
3/ h), it is more obvious that loop back pressure increases, and actual flow calibrated error can be caused to increase.
Summary of the invention
(1) goal of the invention
Problem existing for prior art, the invention provides and a kind ofly can ensure that in liquid metal flux calibration process, back pressure is stablized, stability of flow and calibrated error little be applicable to large discharge (about 500m
3/ h) liquid metal flux demarcate demarcation container, demarcate loop and scaling method.
(2) technical scheme
In order to solve the problem existing for prior art, the present invention is achieved by the following technical solutions:
Container demarcated by a kind of liquid metal flux meter, this demarcation container mainly comprises urceolus, inner core, liquid level gauge, fair water fin, protective casing and fairing, inner core is positioned at urceolus and does not contact with urceolus, and the bottom demarcating container is also provided with liquid metal inlet and liquid metal floss hole;
Described inner core and fairing are the one-piece construction welded together, and this one-piece construction is arranged at the radial center position of outer barrel, and fairing is positioned at below inner core; Wherein fairing is layered structure, according to liquid metal flux size, the number of plies of fairing is set to 1 ~ 5 layer, and the structure of every layer of fairing is consistent, and its shape is disc and disk is provided with symmetrically and enables liquid metal flow into liquid flow hole road between inner core and urceolus; Fairing be used for will the sodium uniform distribution that flow into from liquid metal inlet to container urceolus, and ensure stablizing of large discharge condition underflow stream position liquid level;
Described protective casing is for installing liquid level gauge and temperature thermocouple, and the upper end of protective casing is higher than urceolus top; Protective casing and urceolus top contact place seal, and its lower ending opening also stretches in inner core, to avoid the Liquid Sodium overflowing to inner core to impact liquid level gauge, or cause false triggering and the deviation of reading of liquid level gauge;
Described liquid level gauge stretches in protective casing from protective casing upper end, the contact position of liquid level gauge and protective casing seals, wherein liquid level gauge comprises single-point liquid level gauge and continuous liquid level gauge, wherein single-point liquid level gauge comprises liquid level gauge, middle liquid level gauge, lower liquid level gauge, upper liquid level gauge, the probe of middle liquid level gauge and lower liquid level gauge is positioned at the top of protective casing, middle part and bottom, the volume wherein going up the inner core between liquid level gauge and lower liquid level gauge is the useful volume through metering, the diameter of inner core and useful volume thereof are determined jointly according to amount liquid metal required in the maximum flow lower nominal time and device uncertainty, the contact position of described single-point liquid level gauge and protective casing is provided with insulator, makes to insulate between single-point liquid level gauge and protective casing, and the temperature at insulator place will meet the normal need of work of insulator, described continuous liquid level gauge is positioned at the radial center position of protective casing, its lower end lower than the lower end of protective casing, for Real-Time Monitoring calibration process,
Described fair water fin cross arrangement is fixed between inner core inwall and protective casing outer wall, steadily flows to bottom inner core to the liquid metal of inner core overflow for guiding urceolus;
Preferably, the upper end of urceolus is also provided with argon inlet mouth.
Preferably, the upper end of urceolus is also provided with overflow vent.
Preferably, urceolus is also provided with temperature measuring point, temperature measuring point is distributed in the position likely needing to measure liquid metal temperature, temperature measuring point is used for measuring inner core liquid metal temperature in real time, this temperature is used for the correction at high temperature of inner core useful volume, to reduce the volumetric errors because temperature variation causes, thus improve the accuracy of flow meter calibration.
Preferably, described protective casing and urceolus top contact place pass through welded seal.
Preferably, the material of described fairing, protective casing, inner core and urceolus is stainless steel.
Preferably, described liquid metal is sodium metal.
Above-mentioned demarcation container liquid towards metal flowmeter is utilized to carry out demarcating adopted loop, this loop comprises liquid metal ebullator, surge tank, demarcation container, air cooler, and demarcate container bottom and be not less than surge tank top, surge tank is communicated with the air cavity of liquid metal ebullator pump case; Described liquid metal ebullator be used for for demarcate loop provide can regulate on a large scale, high precision, stable liquid metal drive; Described surge tank is used for providing liquid source for liquid metal ebullator, and its inside arranges well heater, provides thermal source for demarcating loop;
Described liquid metal ebullator is mechanical-type liquid metal circulation pump, and it adopts transducer drive, pump steadily can be regulated within the scope of 150 ~ 1000rpm, realize the smooth change of liquid metal flux, strengthens stability and the reliability of system; The outlet at bottom of described liquid metal ebullator is communicated with the liquid metal inlet demarcating container by the pipeline with valve 18, valve 19, valve 21, and the bottom of liquid metal ebullator is also communicated with the liquid metal floss hole demarcating container by the pipeline with valve 18, valve 19, valve 20, valve 22;
The bottom of liquid metal ebullator is by being connected with the bottom inlet of surge tank with valve 18, valve 19, valve 20, the pipeline of valve 23;
The outlet at bottom of described surge tank is connected with the lower entrances of liquid metal ebullator by valve 25, valve 26 place pipeline; The top of surge tank is communicated with the overflow vent on liquid metal ebullator pump case top by valve 27 place pipeline, and the top air cavity of surge tank is also communicated with the top air cavity demarcating container by valve 24 place pipeline; The liquid metal floss hole demarcating the inner core of container is connected with the entrance bottom surge tank by valve 22, valve 23;
Described air cooler is arranged on valve 25, valve 26 place pipeline, keeps constant to regulate liquid metal temperature;
Described argon system is communicated with respectively by valve 28, valve 29, valve 30 place pipeline and liquid metal ebullator, surge tank and the argon inlet mouth of demarcating container top;
Preferably, described valve 18 is electric check valve, and valve 19 is electric control valve, and valve 20, valve 21 are pneumatic stopping valves; Valve 22, valve 23, valve 24, valve 25, valve 26, valve 27, valve 28, valve 29, valve 30 are pneumatic stopping valve or hand stop valve.
Preferably, the size of described surge tank need adapt with (as 60s) in the maximum flow lower nominal time required amount liquid metal, amount liquid metal in surge tank is maintained between the liquid level upper limit and liquid level lower limit, and the liquid level difference between the liquid level upper limit and liquid level lower limit is 200 ~ 500mm.
Preferably, on described proving flowmeter, the pipeline of flowmeter to be checked between valve 18, valve 19.
Preferably, the liquid level difference in surge tank between the liquid level upper limit and liquid level lower limit is 200 ~ 300mm.
Preferably, described liquid metal is sodium metal.
Utilize above-mentioned demarcation container and demarcation loop liquid towards metal flowmeter to carry out the method for demarcating, the method comprises the following steps:
One, dynamic volume method is utilized to demarcate proving flowmeter
(1) proving flowmeter is installed on the proving flowmeter interface be better than between valve 18, valve 19, open valve 24, valve 27, valve 28, valve 29, valve 30, regulate surge tank internal heater to demarcating temperature, open valve 18, valve 19, valve 20, valve 23, valve 25, valve 26, make to be full of liquid metal in loop;
(2) after in liquid metal ebullator pump case, liquid level of liquid metal meets entry condition, start liquid metal circulation pump, 100% runs more than 10min continuously, regulated by the well heater in air cooler and surge tank, the liquid metal temperature of demarcating in loop is made to meet calibration request, when after stable circulation, start to demarcate;
(3) regulate liquid metal circulation revolution speed and valve 19, make flow reach flow to be calibrated point, stable operation 10min; Flow point to be calibrated described in this step performs about the regulation of calibrating flow point according in industry standard JJG1033-2007 electromagnetic flowmeter vertification regulation.
(4) valve 21, valve-off 20 is opened fast;
(5) starting timing when demarcating the lower liquid level gauge in container inner core and being triggered by liquid metal is t1;
(6) terminating timing when demarcating the upper liquid level gauge in container inner core and being triggered by liquid level is t2, stops ebullator simultaneously, opens valve 22;
(7) liquid metal demarcated in container is discharged by Action of Gravity Field, if desired can valve-off 24, valve 28, valve 29, by the mode quick fluid-discharge state metal that valve 30 pressurizes, until liquid metal drains only in demarcation container, valve-off 21, valve 22, open valve 20, valve 24, valve 28, valve 29, device is returned to step (1) described state;
(8) calculate flow Q according to flow Q=V (T)/(t2-t1), wherein V (T) is the correction volume of the useful volume between upper liquid level gauge and lower liquid level gauge when temperature T;
(9) when the flow Q calculated and flow to be calibrated point differ by more than 5%, restart step (3) ~ (8), until the flow Q calculated differs with flow point to be calibrated be better than 5%, obtain calibration coefficient;
(10) step (3) ~ (9) are repeated, until complete the demarcation of other flow points to be calibrated of flowmeter.
Two, method of standard table is utilized to demarcate flowmeter to be checked
(1) by the liquid metal flux of the grade that meets the requirements demarcated using dynamic volume method as standard scale, flowmeter to be checked is installed on flowmeter interface to be checked;
(2) valve 24, valve 27, valve 28, valve 29, valve 30 is opened, regulate surge tank internal heater to demarcating temperature, open valve 18, valve 19, valve 20, valve 23, valve 25, valve 26, make to be full of liquid metal in loop;
(3) after in liquid metal ebullator pump case, liquid metal position meets entry condition, start liquid metal circulation pump, 100% runs more than 10min continuously, regulated by the well heater in air cooler and surge tank, the liquid metal temperature of demarcating in loop is made to meet calibration request, after systemic circulation is stable, start to demarcate;
(4) regulate liquid metal circulation revolution speed and valve 19, make normal flow reach flow to be calibrated point (error is better than 5%), after stable operation 10min, the reading Q2 of continuous record standard flowmeter Q1, flowmeter to be checked;
(5) according to the incompressibility of liquid metal, Q1=Q2, obtains calibration coefficient.
(6) step (3)-(5) are repeated, until complete the demarcation of other flow points to be calibrated of flowmeter to be checked.
Preferably, described liquid metal is sodium metal.
(3) beneficial effect
The mode that the demarcation container adopting the application to provide adopts inner core, urceolus and fairing etc. to combine, may be used for flow greatly to 500m
3the liquid metal flux of/h is demarcated.Its beneficial effect had is: 1. this demarcation container makes liquid metal enter in urceolus by liquid metal inlet, then along with liquid level of liquid metal rising again overflow in inner core, which ensure that and to be full of its pressure relative constancy after liquid metal between inner core and urceolus, thus back pressure stable when realizing flow meter calibration, and then guaranteed flow is stable, reduces the error that flow rate fluctuation brings.2. the setting of protective casing makes the fair water fin of liquid metal in inner core enter into again and enters protective casing internal trigger single-point liquid level gauge, avoids also large discharge liquid metal to be splashed to liquid level gauge causes surveying phenomenon by mistake.3. the setting of fairing makes liquid metal enter urceolus via the liquid flow hole road in fairing, is assigned to urceolus equably after liquid metal is entered by liquid metal inlet, ensure that the stable of maximum flow condition underflow stream position liquid level.
The demarcation loop that the application provides and scaling method make the liquid metal temperature in fluent metal loop meet calibration request by regulating the measures such as liquid metal circulation pump, surge tank heter temperature, air cooler, and be 200 ~ 500mm by the liquid level difference controlling the liquid level upper limit of liquid metal in surge tank and liquid level lower limit, pressure remained steady scope when the liquid metal that ensure that in surge tank enters liquid metal pump, thus ensure that the accuracy of flow meter calibration.In addition, liquid metal ebullator adopts transducer drive, ensure that the steady adjustment of pump, make liquid metal flux smooth change.
Accompanying drawing explanation
Fig. 1 demarcates container schematic diagram; Wherein 1 is single-point liquid level gauge; 2 is continuous liquid level gauges; 3 is protective casings; 4 is urceolus; 5 is argon inlet mouths; 6 is temperature measuring points; 7 is overflow vents; 8 is fair water fins; 9 is inner cores; 10 is fairings; 11 is liquid metal inlets; 12 is liquid metal floss holes.
Fig. 2 demarcates circuit diagram;
Wherein 15 is liquid metal ebullators; 16 is surge tanks; 17 is demarcate container; 18 is valves 18; 19 is valves 19; 20 is valves 20; 21 is valves 21; 22 is valves 22; 23 is valves 23; 24 is valves 24; 25 is valves 25; 26 is valves 26; 27 is valves 27; 28 is valves 28; 29 is valves 29; 30 is valves 30; 31 is proving flowmeter interfaces; 32 is flowmeter interfaces to be checked; 33 is air coolers; 34 is argon systems; 35 is liquid level upper limits; 36 is liquid level lower limit.
Embodiment
Below in conjunction with specification drawings and specific embodiments, the present invention is further elaborated.
Embodiment 1
Container demarcated by a kind of liquid metal flux meter, this demarcation container mainly comprises urceolus 4, inner core 9, liquid level gauge, fair water fin 8, protective casing 3 and fairing 10, inner core 9 is positioned at urceolus 4 and does not contact with urceolus 4, and the bottom demarcating container is also provided with liquid metal inlet 11 and liquid metal floss hole 12;
Described inner core 9 and the one-piece construction of fairing 10 for welding together, this one-piece construction is arranged at the radial center position of urceolus 4 inside, and fairing 10 is positioned at below inner core 9; Wherein fairing 10 is layered structure, according to liquid metal flux size, the number of plies of fairing 10 is set to 1 ~ 5 layer, the structure of every layer of fairing is consistent, and its shape is disc and disk is provided with symmetrically and enables liquid metal flow into liquid flow hole road between inner core 9 and urceolus 4; Fairing 10 to container urceolus 9, and ensures the stable of large discharge condition underflow stream position liquid level for the sodium uniform distribution that will flow into from liquid metal inlet; The upper end of urceolus 4 is also provided with argon inlet mouth 5; The upper end of urceolus 4 is also provided with overflow vent 7; Urceolus 4 is also provided with temperature measuring point 6, temperature measuring point 6 is distributed in the position likely needing to measure liquid metal temperature, temperature measuring point 6 is for measuring inner core liquid metal temperature in real time, this temperature is used for the correction at high temperature of inner core useful volume, to reduce the volumetric errors because temperature variation causes, thus improve the accuracy of flow meter calibration.
Described protective casing 3 is for installing liquid level gauge and temperature thermocouple, and the upper end of protective casing 3 is higher than urceolus 4 top; Protective casing 3 and urceolus 4 top contact place seal, and its lower ending opening also stretches in inner core 9, to avoid the Liquid Sodium overflowing to inner core 9 to impact liquid level gauge, or causes false triggering and the deviation of reading of liquid level gauge; Described protective casing 3 passes through welded seal with urceolus 4 top contact place.
Described liquid level gauge stretches in protective casing 3 from protective casing 3 upper end, the contact position of liquid level gauge and protective casing 3 seals, wherein liquid level gauge comprises single-point liquid level gauge 1 and continuous liquid level gauge 2, wherein single-point liquid level gauge 1 comprises liquid level gauge, middle liquid level gauge, lower liquid level gauge, upper liquid level gauge, the probe of middle liquid level gauge and lower liquid level gauge is positioned at the top of protective casing 3, middle part and bottom, the volume wherein going up the inner core between liquid level gauge and lower liquid level gauge is the useful volume through metering, the diameter of inner core 9 and useful volume thereof are determined jointly according to amount liquid metal required in the maximum flow lower nominal time and device uncertainty, described single-point liquid level gauge 1 is provided with insulator with the contact position of protective casing 3, makes to insulate between single-point liquid level gauge and protective casing, described continuous liquid level gauge 2 is positioned at the radial center position of protective casing 3, its lower end lower than the lower end of protective casing 3, for Real-Time Monitoring calibration process,
The cross arrangement of described fair water fin 8 is fixed between inner core 9 inwall and protective casing 3 outer wall, steadily flows to bottom inner core to the liquid metal of inner core overflow for guiding urceolus;
The material of described fairing 10, protective casing 3, inner core 9 and urceolus 4 is stainless steel.
Embodiment 2
As different from Example 1, described liquid metal is sodium metal, and flow is 500m
3/ h, the number of plies of fairing is 3 layers.
Embodiment 3
Above-mentioned demarcation container liquid towards metal flowmeter is utilized to carry out demarcating adopted loop, this loop comprises liquid metal ebullator 15, surge tank 16, demarcates container 17, air cooler 33, and demarcate bottom container 17 and be not less than surge tank 16 top, surge tank 16 is communicated with the air cavity of liquid metal ebullator 15 pump case; Described liquid metal ebullator 15 for for demarcate loop provide can regulate on a large scale, high precision, stable liquid metal drive; Described surge tank 16 is for providing liquid source for liquid metal ebullator 15, and its inside arranges well heater, provides thermal source for demarcating loop;
Described liquid metal ebullator 15 is mechanical-type liquid metal circulation pump, and it adopts transducer drive, pump steadily can be regulated within the scope of 150 ~ 1000rpm, realize the smooth change of liquid metal flux, strengthens stability and the reliability of system; The outlet at bottom of described liquid metal ebullator is communicated with the liquid metal inlet demarcating container by the pipeline with valve 18, valve 19, valve 21, and the bottom of liquid metal ebullator is also communicated with the liquid metal floss hole demarcating container 17 by the pipeline with valve 18, valve 19, valve 20, valve 22;
The bottom of liquid metal ebullator 15 is connected with the bottom inlet of surge tank 16 by the pipeline with valve 18, valve 19, valve 20, valve 23;
The outlet at bottom of described surge tank 16 is connected with the lower entrances of liquid metal ebullator 15 by valve 25, valve 26 place pipeline; The top of surge tank 16 is communicated with the overflow vent on liquid metal ebullator 15 pump case top by valve 27 place pipeline, and the top air cavity of surge tank 16 is also communicated with the top air cavity demarcating container 17 by valve 24 place pipeline; The liquid metal floss hole 12 demarcating the inner core of container 17 is connected with the entrance bottom surge tank 16 by valve 22, valve 23; On described proving flowmeter, flowmeter to be checked pipeline between valve 18, valve 19.
Described air cooler 33 is arranged on valve 25, valve 26 place pipeline, keeps constant to regulate liquid metal temperature;
Described argon system 34 is communicated with respectively by valve 28, valve 29, valve 30 place pipeline and liquid metal ebullator 15, surge tank 16 and the argon inlet mouth of demarcating container 17 top;
Described valve 18 is electric check valve, and valve 19 is electric control valve, and valve 20, valve 21 are pneumatic stopping valves; Valve 22, valve 23, valve 24, valve 25, valve 26, valve 27, valve 28, valve 29, valve 30 are pneumatic stopping valve or hand stop valve.
The size of described surge tank 16 need adapt with (as 60s) in the maximum flow lower nominal time required amount liquid metal, the amount liquid metal of surge tank 16 li is maintained between the liquid level upper limit 35 and liquid level lower limit 36, and the liquid level difference between the liquid level upper limit 35 and liquid level lower limit 36 is 200 ~ 500mm.
Embodiment 4
As different from Example 3, described liquid metal is sodium metal; Between surge tank 16 li of liquid level upper limits 35 and liquid level lower limit, the liquid level difference of 36 is 200 ~ 300mm.
Embodiment 5
As different from Example 4, between surge tank 16 li of liquid level upper limits 35 and liquid level lower limit, the liquid level difference of 36 is 200mm.
Embodiment 6
Utilize above-mentioned demarcation container and demarcation loop liquid towards metal flowmeter to carry out the method for demarcating, the method comprises the following steps:
One, dynamic volume method is utilized to demarcate proving flowmeter
(1) proving flowmeter is installed on the proving flowmeter interface 31 be better than between valve 18, valve 19, open valve 24, valve 27, valve 28, valve 29, valve 30, regulate surge tank 16 internal heater to demarcating temperature, open valve 18, valve 19, valve 20, valve 23, valve 25, valve 26, make to be full of liquid metal in loop;
(2) after in liquid metal ebullator 15 pump case, liquid level of liquid metal meets entry condition, start liquid metal circulation pump 15,100% runs more than 10min continuously, regulated by the well heater in air cooler 33 and surge tank 16, the liquid metal temperature of demarcating in loop is made to meet calibration request, when after stable circulation, start to demarcate;
(3) regulate liquid metal circulation pump 15 rotating speed and valve 19, make flow reach flow to be calibrated point, stable operation 10min; Flow point to be calibrated described in this step performs about the regulation of calibrating flow point according in industry standard JJG1033-2007 electromagnetic flowmeter vertification regulation.
(4) valve 21, valve-off 20 is opened fast;
(5) starting timing when demarcating the lower liquid level gauge in container inner core and being triggered by liquid metal is t1;
(6) terminating timing when demarcating the upper liquid level gauge in container inner core and being triggered by liquid level is t2, stops ebullator simultaneously, opens valve 22;
(7) liquid metal demarcated in container is discharged by Action of Gravity Field, if desired can valve-off 24, valve 28, valve 29, by the mode quick fluid-discharge state metal that valve 30 pressurizes, until liquid metal drains only in demarcation container, valve-off 21, valve 22, open valve 20, valve 24, valve 28, valve 29, device is returned to step (1) described state;
(8) calculate flow Q according to flow Q=V (T)/(t2-t1), wherein V (T) is the correction volume of the useful volume between upper liquid level gauge and lower liquid level gauge when temperature T;
(9) when the flow Q calculated and flow to be calibrated point differ by more than 5%, restart step (3) ~ (8), until the flow Q calculated differs with flow point to be calibrated be better than 5%, obtain calibration coefficient;
(10) step (3) ~ (9) are repeated, until complete the demarcation of other flow points to be calibrated of flowmeter.
Two, method of standard table is utilized to demarcate flowmeter to be checked
(1) by the liquid metal flux of the grade that meets the requirements demarcated using dynamic volume method as standard scale, flowmeter to be checked is installed on flowmeter interface 32 to be checked;
(2) valve 24, valve 27, valve 28, valve 29, valve 30 is opened, regulate surge tank internal heater to demarcating temperature, open valve 18, valve 19, valve 20, valve 23, valve 25, valve 26, make to be full of liquid metal in loop;
(3) after in liquid metal ebullator 15 pump case, liquid metal position meets entry condition, start liquid metal circulation pump 15,100% runs more than 10min continuously, regulated by the well heater in air cooler 33 and surge tank 16, the liquid metal temperature of demarcating in loop is made to meet calibration request, after systemic circulation is stable, start to demarcate;
(4) regulate liquid metal circulation pump 15 rotating speed and valve 19, make normal flow reach flow to be calibrated point (error is better than 5%), after stable operation 10min, the reading Q2 of continuous record standard flowmeter Q1, flowmeter to be checked;
(5) according to the incompressibility of liquid metal, Q1=Q2, obtains calibration coefficient.
(6) step (3)-(5) are repeated, until complete the demarcation of other flow points to be calibrated of flowmeter to be checked.
Embodiment 7
As different from Example 6, described liquid metal is sodium metal.
Claims (15)
1. container demarcated by a liquid metal flux meter, it is characterized in that, this demarcation container mainly comprises urceolus, inner core, liquid level gauge, fair water fin, protective casing and fairing, inner core is positioned at urceolus and does not contact with urceolus, and the bottom demarcating container is also provided with liquid metal inlet and liquid metal floss hole;
Described inner core and fairing are the one-piece construction welded together, and this one-piece construction is arranged at the radial center position of outer barrel, and fairing is positioned at below inner core; Wherein fairing is layered structure, according to liquid metal flux size, the number of plies of fairing is set to 1 ~ 5 layer, and the structure of every layer of fairing is consistent, and its shape is disc and disk is provided with symmetrically and enables liquid metal flow into liquid flow hole road between inner core and urceolus; Fairing be used for will the sodium uniform distribution that flow into from liquid metal inlet to container urceolus, and ensure stablizing of large discharge condition underflow stream position liquid level;
Described protective casing is for installing liquid level gauge and temperature thermocouple, and the upper end of protective casing is higher than urceolus top; Protective casing and urceolus top contact place seal, and its lower ending opening also stretches in inner core, to avoid the Liquid Sodium overflowing to inner core to impact liquid level gauge, or cause false triggering and the deviation of reading of liquid level gauge;
Described liquid level gauge stretches in protective casing from protective casing upper end, the contact position of liquid level gauge and protective casing seals, wherein liquid level gauge comprises single-point liquid level gauge and continuous liquid level gauge, wherein single-point liquid level gauge comprises liquid level gauge, middle liquid level gauge, lower liquid level gauge, upper liquid level gauge, the probe of middle liquid level gauge and lower liquid level gauge is positioned at the top of protective casing, middle part and bottom, the volume wherein going up the inner core between liquid level gauge and lower liquid level gauge is the useful volume through metering, the diameter of inner core and useful volume thereof are determined jointly according to amount liquid metal required in the maximum flow lower nominal time and device uncertainty, the contact position of described single-point liquid level gauge and protective casing is provided with insulator, makes to insulate between single-point liquid level gauge and protective casing, described continuous liquid level gauge is positioned at the radial center position of protective casing, its lower end lower than the lower end of protective casing, for Real-Time Monitoring calibration process,
Described fair water fin cross arrangement is fixed between inner core inwall and protective casing outer wall, steadily flows to bottom inner core to the liquid metal of inner core overflow for guiding urceolus.
2. container demarcated by a kind of liquid metal flux meter according to claim 1, and it is characterized in that, the upper end of urceolus is also provided with argon inlet mouth.
3. container demarcated by a kind of liquid metal flux meter according to claim 1, and it is characterized in that, the upper end of urceolus is also provided with overflow vent.
4. container demarcated by a kind of liquid metal flux meter according to claim 1, it is characterized in that, urceolus is also provided with temperature measuring point, and temperature measuring point is distributed in the position likely needing to measure liquid metal temperature.
5. container demarcated by a kind of liquid metal flux meter according to claim 1, and it is characterized in that, described protective casing and urceolus top contact place pass through welded seal.
6. container demarcated by a kind of liquid metal flux meter according to claim 1, and it is characterized in that, the material of described fairing, protective casing, inner core and urceolus is stainless steel.
7. container demarcated by a kind of liquid metal flux meter according to claim 1, and it is characterized in that, described liquid metal is sodium metal.
8. utilize the demarcation container liquid towards metal flowmeter described in claim 1 to carry out demarcating adopted demarcation loop, it is characterized in that, this loop comprises liquid metal ebullator, surge tank, demarcation container, air cooler, and demarcate container bottom and be not less than surge tank top, surge tank is communicated with the air cavity of liquid metal ebullator pump case; Described liquid metal ebullator be used for for demarcate loop provide can regulate on a large scale, high precision, stable liquid metal drive; Described surge tank is used for providing liquid source for liquid metal ebullator, and its inside arranges well heater, provides thermal source for demarcating loop;
Described liquid metal ebullator is mechanical-type liquid metal circulation pump, and it adopts transducer drive, and ebullator steadily can be regulated within the scope of 150 ~ 1000rpm; The outlet at bottom of described liquid metal ebullator is communicated with the liquid metal inlet demarcating container by the pipeline with valve 18, valve 19, valve 21, and the bottom of liquid metal ebullator is also communicated with the liquid metal floss hole demarcating container by the pipeline with valve 18, valve 19, valve 20, valve 22;
The bottom of liquid metal ebullator is by being connected with the bottom inlet of surge tank with valve 18, valve 19, valve 20, the pipeline of valve 23;
The outlet at bottom of described surge tank is connected with the lower entrances of liquid metal ebullator by valve 25, valve 26 place pipeline; The top of surge tank is communicated with the overflow vent on liquid metal ebullator pump case top by valve 27 place pipeline, and the top air cavity of surge tank is also communicated with the top air cavity demarcating container by valve 24 place pipeline; The liquid metal floss hole demarcating the inner core of container is connected with the entrance bottom surge tank by valve 22, valve 23;
Described air cooler is arranged on valve 25, valve 26 place pipeline, keeps constant to regulate liquid metal temperature;
Described argon system is communicated with respectively by valve 28, valve 29, valve 30 place pipeline and liquid metal ebullator, surge tank and the argon inlet mouth of demarcating container top.
9. described demarcation loop according to claim 8, is characterized in that, valve 18 is electric check valve, and valve 19 is electric control valve, and valve 20, valve 21 are pneumatic stopping valves; Valve 22, valve 23, valve 24, valve 25, valve 26, valve 27, valve 28, valve 29, valve 30 are pneumatic stopping valve or hand stop valve.
10. described demarcation loop according to claim 8, it is characterized in that, the size of described surge tank need adapt with required amount liquid metal in the maximum flow lower nominal time, amount liquid metal in surge tank is maintained between the liquid level upper limit and liquid level lower limit, and the liquid level difference between the liquid level upper limit and liquid level lower limit is 200 ~ 500mm.
11. described demarcation loops according to claim 8, is characterized in that, on described proving flowmeter, flowmeter to be checked pipeline between valve 18, valve 19.
12. described demarcation loops according to claim 8, it is characterized in that, the liquid level difference in surge tank between the liquid level upper limit and liquid level lower limit is 200 ~ 300mm.
13. described demarcation loops according to claim 8, it is characterized in that, described liquid metal is sodium metal.
14. utilize the demarcation container described in claim 1 and demarcation loop according to claim 8 liquid towards metal flowmeter to carry out the scaling method demarcated, and it is characterized in that, the method comprises the following steps:
One, dynamic volume method is utilized to demarcate proving flowmeter
(1) proving flowmeter is installed on the proving flowmeter interface be better than between valve 18, valve 19, open valve 24, valve 27, valve 28, valve 29, valve 30, regulate surge tank internal heater to demarcating temperature, open valve 18, valve 19, valve 20, valve 23, valve 25, valve 26, make to be full of liquid metal in loop;
(2) after in liquid metal ebullator pump case, liquid level of liquid metal meets entry condition, start liquid metal circulation pump, 100% runs more than 10min continuously, regulated by the well heater in air cooler and surge tank, the liquid metal temperature of demarcating in loop is made to meet calibration request, when after stable circulation, start to demarcate;
(3) regulate liquid metal circulation revolution speed and valve 19, make flow reach flow to be calibrated point, stable operation 10min;
(4) valve 21, valve-off 20 is opened fast;
(5) starting timing when demarcating the lower liquid level gauge in container inner core and being triggered by liquid metal is t1;
(6) terminating timing when demarcating the upper liquid level gauge in container inner core and being triggered by liquid level is t2, stops ebullator simultaneously, opens valve 22;
(7) liquid metal demarcated in container is discharged by Action of Gravity Field, if desired can valve-off 24, valve 28, valve 29, by the mode quick fluid-discharge state metal that valve 30 pressurizes, until liquid metal drains only in demarcation container, valve-off 21, valve 22, open valve 20, valve 24, valve 28, valve 29, device is returned to step (1) described state;
(8) calculate flow Q according to flow Q=V (T)/(t2-t1), wherein V (T) is the correction volume of the useful volume between upper liquid level gauge and lower liquid level gauge when temperature T;
(9) when the flow Q calculated and flow to be calibrated point differ by more than 5%, restart step (3) ~ (8), until the flow Q calculated differs with flow point to be calibrated be better than 5%, obtain calibration coefficient;
(10) step (3) ~ (9) are repeated, until complete the demarcation of other flow points to be calibrated of flowmeter;
Two, method of standard table is utilized to demarcate flowmeter to be checked
(1) by the liquid metal flux of the grade that meets the requirements demarcated using dynamic volume method as standard scale, flowmeter to be checked is installed on flowmeter interface to be checked;
(2) valve 24, valve 27, valve 28, valve 29, valve 30 is opened, regulate surge tank internal heater to demarcating temperature, open valve 18, valve 19, valve 20, valve 23, valve 25, valve 26, make to be full of liquid metal in loop;
(3) after in liquid metal ebullator pump case, liquid metal position meets entry condition, start liquid metal circulation pump, 100% runs more than 10min continuously, regulated by the well heater in air cooler and surge tank, the liquid metal temperature of demarcating in loop is made to meet calibration request, after systemic circulation is stable, start to demarcate;
(4) regulate liquid metal circulation revolution speed and valve 19, make normal flow reach flow to be calibrated point, after stable operation 10min, the reading Q2 of continuous record standard flowmeter Q1, flowmeter to be checked;
(5) according to the incompressibility of liquid metal, Q1=Q2, obtains calibration coefficient;
(6) step (3) ~ (5) are repeated, until complete the demarcation of other flow points to be calibrated of flowmeter to be checked.
15. scaling methods according to claim 14, is characterized in that, described liquid metal is sodium metal.
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