CN102012251B - Method and device for detecting additives, abrasion or corrosion on wall of vibrating tube of Coriolis mass flowmeter - Google Patents
Method and device for detecting additives, abrasion or corrosion on wall of vibrating tube of Coriolis mass flowmeter Download PDFInfo
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- CN102012251B CN102012251B CN2010102994598A CN201010299459A CN102012251B CN 102012251 B CN102012251 B CN 102012251B CN 2010102994598 A CN2010102994598 A CN 2010102994598A CN 201010299459 A CN201010299459 A CN 201010299459A CN 102012251 B CN102012251 B CN 102012251B
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Abstract
The invention relates to all application fields of a Coriolis mass flowmeter for fluid density measurement and mass measurement. The invention discloses a method for detecting additives, abrasion or corrosion on the wall of a vibrating tube wall of the Coriolis mass flowmeter, which comprises the following steps of: presetting the threshold low value and the threshold high value of the three-order resonant frequency of the vibrating tube; periodically measuring the three-order resonant frequency of the vibrating tube; and comparing the measured three-order resonant frequencies with the threshold values and analyzing the variation rule of the measured three-order resonant frequencies at the same time. The invention relates to a device for realizing the method, which comprises a zero point judgment assisting device for controlling fluid flowing or stopping in the vibrating tube, a control device for controlling the zero point judgment assisting device and a resolving device for the statistic analysis of the three-order resonant frequencies and variation thereof. The method of the invention can be used for more accurately judging the abnormal working state the vibrating tube of the Coriolis mass flowmeter has additives, abrasion or corrosion.
Description
[technical field]
The present invention relates to all spectra of the coriolis mass flowmeters application of industrial process fluid density measures such as oil, chemical industry, rock gas, mass measurement, relate in particular to duty on-line monitoring, on-line proving and the fault diagnosis of coriolis mass flowmeters.
[background technology]
Coriolis mass flowmeters is used to measure the mass rate and the out of Memory of the material that flows through pipeline.As United States Patent (USP) Re.31450 in the February 11 nineteen eighty-two of authorizing people such as J.E.Smith; People's such as United States Patent (USP) NO.4491025 and Ren Sicong the Chinese patent NO.ZL200410073046.2 on 21 days November in 2006 on 1 day January in 1985 that authorizes people such as J.E.Smith is disclosed; This flowmeter has the vibrating tube of one or more identical configurations; The configuration of each vibrating tube can be counted as has one group of eigentone, for example comprises simple bending, reverses, radially and CGCM.In the application of typical coriolis mass flowmeters, when flow of material was crossed this pipeline, vibrating tube was with one or more vibration mode vibrations.When static or detected fluid does not charge into vibrating tube when detected fluid; All positions have identical vibration phase on the flowmeter vibrating tube; When fluid flow through this vibrating tube with certain speed, Coriolis acceleration caused with respect to other point along this vibrating tube different phase being arranged along each point of this vibrating tube.The phase lag at this vibrating tube inlet end place is in driver; The phase place of output is ahead of driver; Vibro-pickup is arranged in the difference place of vibrating tube; Produce and the relevant sinusoidal signal of vibrating tube difference place vibration phase, calculate the phase differential of the sinusoidal signal of picking up, phase differential and to flow through the mass rate of vibrating tube proportional with chronomere.
The fluid of coriolis mass flow meter measurement not exclusively is an one-component; Has certain viscosity; Even the detected fluid viscosity that has is very big, and there is corrosive attack in the detected fluid that has to the coriolis mass flowmeters vibrating tube, has solid phase stream or SS in the detected fluid that has.To the coriolis mass flowmeters of curvature vibrating tube is arranged; Solid phase stream and the impurity in a spot of detected fluid in the detected fluid deposit at the bend place of vibrating tube and the adjacent area of connecting part, straight way place more easily; Form the condiment (condiment comprises impurity, the solid particle in the detected fluid and is attached to all materials that make on the vibrating tube inwall that the vibrating tube quality increases) on the coriolis mass flowmeters vibrating tube, solid phase stream or solid particle in the detected fluid exist erosive wear and brinelling (normally irregular wear) to the coriolis mass flowmeters vibrating tube.No matter being erosive wear, brinelling or the fluid corrosive attack to vibrating tube, all is the abrasive action to the coriolis mass flowmeters vibrating tube.Condiment makes the vibrating tube part lumped mass occur, and abrasive action makes the local tube wall attenuation of vibrating tube.There is certain influence in they to zero point drift, the flow slope of coriolis mass flowmeters, influence the isoparametric measuring accuracy of density, quality, viscosity of coriolis mass flowmeters convection cell.Accurate metering for the flow instrument of ensuring the quality of products; Coriolis mass flowmeters before dispatching from the factory with safeguard after must be regular to its test, verification and demarcation; Also must regularly carry out the calibration of off-line to it in the use, the calibration interval of regulation coriolis mass flowmeters generally are no more than 2 years in " People's Republic of China's national metrological verification regulations ".This calibration steps has many problems.A problem is, calibration cycle is shorter, and off-line calibration expends more human resources, physical resource and financial resources.Another extremely important problem is exactly; In calibration cycle; Can not monitor the abnormal work state (comprising condiment, wearing and tearing or corrosion) of coriolis mass flowmeters in real time; Along with the condiment quality and the degree of wear constantly increase, the measuring accuracy of coriolis mass flowmeters constantly reduces, and produces serious measuring error.
In in November, 1997 of authorizing people such as B.L. Ka Bente and A.X. Lu Na in the U.S. on the 26th patent NO.95195442.3 patent, disclose and be used for coriolis mass flowmeters fault detect and method of correcting and device.The theoretical foundation of the method and apparatus of mentioning in this patent is: the resonance frequency that vibrating tube is vibrated needed driving power and vibrating tube is that unusual sign appears in coriolis mass flowmeters vibrating tube duty; In its disclosed content also Special attention will be given to utilize the resonance frequency of driving power and vibrating tube can confirm all abnormal work states, in embodiment, be mainly used in and detect vibrating tube crack fault.Its rule is: the prolongation of the time that exists along with the crack, and resonance frequency is successively decreased by non-linear, and rate of regression constantly increases; Driving power is pressed non-linear increasing, and ascending rate also constantly increases.The deficiency of this method is; Said resonance frequency is the single order resonance frequency of vibrating tube; When being in multiple abnormal work state, vibrating tube (comprises the increase of condiment quality; The attrition and attacks of inner-walls of duct etc.) time, when the single order change of resonance frequency characteristic of driving power that various ERSies cause and vibrating tube was identical, be difficult to distinguish was that which kind of abnormal work state has influenced the precision that convection cell is measured actually.For example: when coriolis mass flowmeters vibrating tube tube wall had condiment, driving power was pressed non-linear increasing with the increase of additional amount, and ascending rate constantly increases; When the coriolis mass flowmeters vibrating tube was worn, the single order resonance frequency increased with the degree of wear and successively decreases by non-linear, and rate of regression constantly increases.So; When there is multiple abnormal work state in the coriolis mass flowmeters vibrating tube; Such as abnormal work states such as crack, condiment and wearing and tearing are when existing simultaneously, and utilizing driving power and single order change of resonance frequency trend to judge the coriolis mass flowmeters vibrating tube, to be in the abnormal work state that has crack abnormal work state, vibrating tube to have condiment abnormal work state or vibrating tube to be worn be inaccurate.Perhaps just can't confirm which kind of abnormal work state is the coriolis mass flowmeters vibrating tube be at all.
[summary of the invention]
The purpose of this invention is to provide a kind of affirmation coriolis mass flowmeters vibrating tube tube wall has condiment, vibrating tube tube wall to be worn or corroding method; This method can be accurately, three rank resonance frequencies through resolving the coriolis mass flowmeters vibrating tube have condiment and the vibrating tube abnormal work state that is worn to carry out on-line monitoring, real-time judge to vibrating tube simply.
The present invention also provides a kind of device of realizing said method.
One aspect of the present invention comprises and is used to confirm that coriolis mass flowmeters vibrating tube tube wall has condiment, vibrating tube tube wall to be worn or corroding method, may further comprise the steps:
The threshold value low value of three rank resonance frequencies of predetermined vibration pipe and high value;
Three rank resonance frequencies of measuring vibrations pipe periodically;
The three rank resonance frequencies and the threshold value that record are compared, analyze three measured rank change of resonance frequency rule rates simultaneously.
When the low value of the three rank resonance frequencies that record, when three simultaneously measured rank resonance frequencies dullnesses descend, confirm that coriolis mass flowmeters vibrating tube tube wall has condiment less than threshold value.
When the three rank resonance frequencies that record greater than the low value of threshold value and less than the high value of threshold value, three simultaneously measured rank resonance frequencies are dull earlier to be increased, and during dull then decline, confirms that coriolis mass flowmeters vibrating tube tube wall is worn.
When the three rank resonance frequencies that record earlier greater than the low value of threshold value, but, less than the low value of threshold value, confirm the existing condiment of coriolis mass flowmeters vibrating tube tube wall then less than the high value of threshold value, be worn again.
The present invention comprises a kind of device of realizing said method on the other hand, is provided with the resolver of statistical study three rank resonance frequencies and variation thereof in this device.
Described resolver preferably is made up of signal collecting element, signal condition element, Signal Processing Element and data storage device; Wherein data storage device is used to store each time measurement data; Therefore new Monitoring Data and stored history can compare, and judges the variation tendency of the new relative historical data of data.
Be further to improve accuracy, a further aspect of the present invention provides and a kind ofly is used to confirm that coriolis mass flowmeters vibrating tube tube wall has condiment, vibrating tube tube wall to be worn or corroding method, may further comprise the steps:
The threshold value low value of three rank resonance frequencies of predetermined vibration pipe and high value;
Periodically make the fluid in the vibrating tube stop to flow, three rank resonance frequencies of measuring vibrations pipe;
The three rank resonance frequencies and the threshold value that record are compared, analyze three measured rank change of resonance frequency rule rates simultaneously.
When the low value of the three rank resonance frequencies that record, when three simultaneously measured rank resonance frequencies dullnesses descend, confirm that coriolis mass flowmeters vibrating tube tube wall has condiment less than threshold value.
When the three rank resonance frequencies that record greater than the low value of threshold value and less than the high value of threshold value, three simultaneously measured rank resonance frequencies are dull earlier to be increased, and during dull then decline, confirms that coriolis mass flowmeters vibrating tube tube wall is worn.
When the three rank resonance frequencies that record earlier greater than the low value of threshold value, but, less than the low value of threshold value, confirm the existing condiment of coriolis mass flowmeters vibrating tube tube wall then less than the high value of threshold value, be worn again.
A further aspect of the present invention comprises a kind of device of realizing said method, it is characterized in that comprising: fluid flows or judges that servicing unit, control judges the resolver of control device, statistical study three rank resonance frequencies and the variation thereof of servicing unit zero point at zero point of stopping in the control vibrating tube.
Judge preferably stop valve of servicing unit wherein said zero point.
Described resolver preferably is made up of signal collecting element, signal condition element, Signal Processing Element and data storage device; Wherein data storage device is used to store each time measurement data; Therefore new Monitoring Data and stored history can compare, and judges the variation tendency of the new relative historical data of data.
Said method of the present invention is on-line monitoring more accurately; Real-time judge coriolis mass flowmeters vibrating tube is in the method for other abnormal work state; Especially the coriolis mass flowmeters vibrating tube has the judgement of the judgement of accrete abnormal work state and the abnormal work state that vibrating tube is worn, for compensating measurement errors, the calibration cycle that guarantees that the accuracy of coriolis mass flowmeters convection cell measured value of parameters is higher and prolong coriolis mass flowmeters lays the foundation.
[description of drawings]
Fig. 1 is to be detected fluid with alcohol in the embodiments of the invention, variable quantity theoretical value distribution curve and experimental data distribution curve that three rank resonance frequencies of the vibrating tube that the coriolis mass flowmeters vibrating tube counts on when condiment is arranged increase with additional amount;
Fig. 2 is to be detected fluid with water, alcohol and kerosene in the embodiments of the invention, the theoretical value variable quantity histogram that three rank resonance frequencies of vibrating tube increased with the degree of wear when coriolis mass flowmeters vibrating tube was worn;
Fig. 3 is to be detected fluid with water, alcohol and kerosene in the embodiments of the invention, the variable quantity experimental data histogram that three rank resonance frequencies of the vibrating tube that the coriolis mass flowmeters vibrating tube counts on when being worn increase with the degree of wear;
Fig. 4 is the ZLJC7 type coriolis mass flowmeters structural representation among the embodiment;
Among the figure: 1---vibrating tube, 2---vibrating tube, 3---temperature sensor, 4,9,12---joint flange; 5---divide fluid, 6,7---phase difference detection device, 8,13---distance plate, 10---terminals; 11---sensor body, 14---shell, 15---exciting device magnet; 16---the exciting device coil, 17---coriolis mass flowmeters, 18---stop valve.
[embodiment]
Three rank resonance frequencies of flowmeter vibrating tube are the build-in attributes of vibrating tube, and are closely related with the structure of vibrating tube.The motion state of fluid can not influence the size of three rank resonance frequencies under desirable operating mode, and three rank resonance frequencies are periodically measured and analyzed, and have just realized the real-time monitoring to flowmeter vibrating tube abnormal work state.Because three first order modes of vibrating tube are similar with the vibration shape of the vibrating tube that Coriolis acceleration causes; The working environment of the flowmeter coupling of multiple influence factor often in addition; For accuracy is resolved in raising, adopted in the present embodiment and under the fluid stationary state, resolved vibrating tube three rank resonance frequencies.
In the application of coriolis mass flowmeters; Be difficult to avoid its vibrating tube to have the deposition of solid formation; Make the flowmeter vibrating tube that condiment arranged; Solid formation in the detected fluid to the corrosive attack of flowmeter vibrating tube, makes the flowmeter vibrating tube by non-homogeneous attenuation to the abrasive action of flowmeter vibrating tube or detected fluid.
Calculate the resonance frequency of coriolis mass flowmeters vibrating tube by the hypothesis modal analysis method of vibration mechanics.Utilize hypothesis mode method that the ZLJC7 type coriolis mass flowmeters vibrating tube of present embodiment is carried out discretize; Obtain the kinetic energy and the potential energy of the discretize back rest, the free vibration differential equation
that goes out beam according to virtual displacement virtual work and Lagrange's equation theoretical derivation suppose equation separate for
a be the undetermined constant array.Bring q into the differential equation and get,
[K-M λ] a=0, λ=p
2, obtain N eigenwert and corresponding proper vector a thus
i,
It is exactly the approximate value of former continuous N natural frequency.
When condiment appears in the inwall of vibrating tube, when kinetic energy that calculates beam and potential energy, count the kinetic energy and the potential energy of condiment quality, successively the corresponding matrix M of writing system, K.k
IjRemain unchanged, and
(m is the condiment quality) got i=j=3, solves three order frequencies (the theoretical value variable quantity of embodiments of the invention as shown in fig. 1) of ZLJC7 type coriolis mass flowmeters vibrating tube under different condiment quality.
Obtain the approximate value of former continuous N natural frequency earlier; After vibrating tube is worn; When kinetic energy that calculates beam and potential energy, count the kinetic energy and the potential energy of the material quality that is worn, the corresponding matrix M of writing system, K adjust linear mass ρ simultaneously successively.k
IjRemain unchanged, and
(m ' be worn for vibrating tube quality) gets i=j=3, solves three order frequencies (the theoretical value variable quantity of embodiments of the invention as shown in Figure 2) of ZLJC7 type coriolis mass flowmeters vibrating tube under the different degrees of wear.
Present embodiment is to be detected fluid with water, alcohol and kerosene.Concrete implementation procedure is: system is before operation; Coriolis mass flowmeters vibrating tube three rank resonance frequency threshold values (low/height) were respectively 155.65Hz/157.135Hz, 159.325Hz/161.030Hz and 159.820Hz/161.220Hz when the setting detected fluid was water, alcohol and kerosene.After system opens; Control device is controlled and is judged periodically switch of servicing unit zero point; Make that fluid periodically stops to flow in the vibrating tube; Resolver is to output signal a, the b of the vibro-pickup of phase difference detection device then, output signal c three road signals of drive coil by certain period (cycle that comprises any one length is taken as a week in the present embodiment) carry out signals collecting, signal condition, signal resolves and data storage; Obtain three rank resonance frequency information (as shown in Figure 3) of coriolis mass flowmeters vibrating tube, last statistical study three rank resonance frequency and variations thereof.
When the low value of the three rank resonance frequencies that record less than threshold value, during simultaneously measured dull decline of three rank resonance frequencies, then ZLJC7 type coriolis mass flowmeters vibrating tube is in condiment abnormal work state is arranged certainly; If the three rank resonance frequencies that record are greater than the low value of threshold value and less than the high value of threshold value; Three simultaneously measured rank resonance frequencies are dull earlier to be increased; During dull then decline, then ZLJC7 type coriolis mass flowmeters vibrating tube is worn certainly, is in the vibrating tube abnormal work state that is worn; If the three rank resonance frequencies that record are earlier greater than the low value of threshold value, then less than the low value of threshold value, then vibrating tube has condiment abnormal work state and the vibrating tube abnormal work state that is worn to exist simultaneously certainly.The experimental data of three rank resonance frequency variable quantities when detected vibrating tube has condiment in the present embodiment is compared with its theoretical value, and maximum error is lower than 2%; With water, alcohol, kerosene is among the wearing and tearing embodiment of detected fluid, and detected three rank resonance frequency experiment values are compared with theoretical value, and maximum error is lower than 3%.The abnormal work state is feasible so condiment abnormal work state and the vibrating tube of utilizing three rank change of resonance frequency to detect the coriolis mass flowmeters vibrating tube are worn.
Claims (10)
1. detect Coriolis flowmeter vibrating tube tube wall condiment, wearing and tearing or corroding method, it is characterized in that may further comprise the steps:
The threshold value low value of three rank resonance frequencies of predetermined vibration pipe and high value;
Three rank resonance frequencies of measuring vibrations pipe periodically;
The three rank resonance frequencies and the threshold value that record are compared, analyze three measured rank change of resonance frequency rules simultaneously.
2. the method for claim 1 is characterized in that may further comprise the steps:
The threshold value low value of three rank resonance frequencies of predetermined vibration pipe and high value;
Periodically make the fluid in the vibrating tube stop to flow, three rank resonance frequencies of measuring vibrations pipe;
The three rank resonance frequencies and the threshold value that record are compared, analyze three measured rank change of resonance frequency rules simultaneously.
3. according to claim 1 or claim 2 method is characterized in that
When the low value of the three rank resonance frequencies that record, when three simultaneously measured rank resonance frequencies dullnesses descend, confirm that Coriolis flowmeter vibrating tube tube wall has condiment less than threshold value.
4. according to claim 1 or claim 2 method is characterized in that
When the three rank resonance frequencies that record greater than the low value of threshold value and less than the high value of threshold value, three simultaneously measured rank resonance frequencies are dull earlier to be increased, and during dull then decline, confirms that Coriolis flowmeter vibrating tube tube wall is worn.
5. according to claim 1 or claim 2 method is characterized in that
When the three rank resonance frequencies that record earlier greater than the low value of threshold value, but, less than the low value of threshold value, confirm the existing condiment of Coriolis flowmeter vibrating tube tube wall then less than the high value of threshold value, be worn again.
6. realize the device of method according to claim 1 for one kind, it is characterized in that comprising the resolver of statistical study three rank resonance frequencies and variation thereof.
7. the device of realization such as the said method of claim 2 is characterized in that comprising following structure:
The resolver of control device, statistical study three rank resonance frequencies and the variation thereof of servicing unit is judged in control zero point.
8. device as claimed in claim 7 is characterized in that also being provided with in the described device that fluid in the control vibrating tube flows or judge servicing unit at zero point of stopping.
9. device as claimed in claim 8 is characterized in that judging described zero point that servicing unit is a stop valve.
10. like claim 6 or 7 described devices, it is characterized in that described resolver is made up of signal collecting element, signal condition element, Signal Processing Element and data storage device.
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| EP3783320B1 (en) * | 2017-08-30 | 2024-01-24 | Micro Motion Inc. | Detecting and identifying a change in a vibratory meter |
| CN108955837B (en) * | 2018-07-20 | 2020-02-28 | 浙江中衡商品检验有限公司 | Method for determining online system error of mass flowmeter and application thereof |
| IT201900006274A1 (en) * | 2019-04-23 | 2020-10-23 | Nuovo Pignone Tecnologie Srl | Arrangement with sensor and method for measuring fouling or erosion or corrosion as well as machine monitoring fouling or erosion or corrosion |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2729652Y (en) * | 2004-09-24 | 2005-09-28 | 欧歌 | Vibrating tube for Ke's mass flowmeter |
| CN101581595A (en) * | 2003-09-29 | 2009-11-18 | 微动公司 | Method for determining flow calibration factor of Coriolis flowmeter |
| CN101819056A (en) * | 2005-09-19 | 2010-09-01 | 微动公司 | Instrument electronic device for checking and diagnosing flow meter and method |
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| WO2010088921A1 (en) * | 2009-02-04 | 2010-08-12 | Siemens Aktiengesellschaft | Electromagnetic flowmeter having corrosion protection of measuring electrodes, and method incorporating the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101581595A (en) * | 2003-09-29 | 2009-11-18 | 微动公司 | Method for determining flow calibration factor of Coriolis flowmeter |
| CN2729652Y (en) * | 2004-09-24 | 2005-09-28 | 欧歌 | Vibrating tube for Ke's mass flowmeter |
| CN101819056A (en) * | 2005-09-19 | 2010-09-01 | 微动公司 | Instrument electronic device for checking and diagnosing flow meter and method |
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Address after: 710000 Shaanxi city of Xi'an province high tech Zone Feng Hui Road No. 36 oak block B406 Patentee after: Xi'an Dongfeng electromechanical Limited by Share Ltd Address before: 710000 Shaanxi city of Xi'an province high tech Zone Feng Hui Road No. 36 oak block B406 Patentee before: Dongfeng Electromechanic Co., Ltd., Xi-an |