CN1184483C - Integrated in-situ measuring method and system of slurry density and flow rate - Google Patents
Integrated in-situ measuring method and system of slurry density and flow rate Download PDFInfo
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- CN1184483C CN1184483C CNB021577382A CN02157738A CN1184483C CN 1184483 C CN1184483 C CN 1184483C CN B021577382 A CNB021577382 A CN B021577382A CN 02157738 A CN02157738 A CN 02157738A CN 1184483 C CN1184483 C CN 1184483C
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Abstract
The present invention relates to a method and a system for measuring slurry density and flow rate on line. The system is provided with an energizing coil and an integrated sensor on an insulated pipeline flown by current conducting slurry, and simultaneously, measures the flow rate, the density and the temperature of on-line slurry; finally, the three detecting values are treated by a microprocessor to obtain the density flow rate of slurry with temperature compensation. The present invention has the advantages of high measuring precision, simple system structure, low cost and high stability and reliability, and is suitable for the fields of light industry, environmental protection and foodstuffs; the present invention is especially suitable for the on-line measurement of the density flow rate of the slurry in the field of papermaking.
Description
Technical field:
The present invention relates to a kind of measuring method and system of slurry concentration flow, particularly a kind of integrated form slurry concentration flow On-line Measuring Method and system.
Background technology:
The concentration flow of slurry is important detected object in the fields such as light industry, environmental protection, food, the slurry flow, especially paper pulp, mud etc. are non-Newtonian fluids, have factors such as viscosity, bulk, suspended particle are many, complicated component, multiparameter, detect the fluid of difficulty so belong to.Detect this class slurry, employing Coriolis (Coriolis) mass flowmeter is arranged in existing surveying instrument, though this instrument can be measured flow and two fluid parameters of density simultaneously, but it exists the cost height, the pressure loss is big, especially the deficiency that then can't detect when the tested pipeline bore is big.Using more method for a long time on the engineering is to adopt many measurement instruments of configuration to measure respectively, as densitometer, thermometer and flowmeter, but when adopting the measuring method of this many instrument, because a plurality of sensors are set up separately, must be installed in respectively in the tested pipeline during use, bring thus trouble, maintenance cost height and the low deficiency of measuring accuracy are installed.
Summary of the invention:
The object of the present invention is to provide a kind of integrated form slurry concentration flow On-line Measuring Method and system, on the basis of improving the measuring multiple parameters precision, make system have simple in structure, low-cost, stability and high reliability features.
For achieving the above object, the present invention adopts following technical proposals:
A kind of integrated form slurry concentration flow On-line Measuring Method, it is characterized in that making the conduction slurry isolated pipe of flowing through, adopt electromagnetic flow transducer, ultrasonic reception wave transducer and ultrasound transmitting transducer and the integrated integrated sensor of temperature sensor, carry out online slurry flow, concentration and temperature detection simultaneously, at last above-mentioned three detected values are handled by microprocessor, obtained to have the slurry concentration flow value of temperature compensation.
In isolated pipe under the conduction situation of slurry flow direction perpendicular to magnetic field, record flow signal by the pair of electrodes of installing perpendicular to magnetic field and flow direction electromagnetic flow transducer the time in the integrated sensor, and measure two interpolar induced potential E by the flow signal metering circuit, calculate slurry flow Q:E=K * B * Q by following formula by microprocessor, K is the electromagnetic flow transducer constant in the formula, and B is a magnetic field intensity.
Ultrasound wave receiving transducer ultrasound transmitting transducer is propagated ultrasound wave in the integrated sensor in the compressional wave mode in slurry, and the ultrasonic signal after its receiving end spreads out of decay, measure hyperacoustic relative attenuation between transmitting terminal and receiving end by the ultrasound wave receiving circuit, by following formula by the concentration C of calculating slurry by microprocessor: ξ x=ξ o * e
-α x, ξ in the formula
0Be original amplitude, ξ x is the amplitude after the sonic propagation x distance, and x is the sonic propagation distance, and α is the acoustic attenuation coefficient, and slurry concentration C is directly proportional with the acoustic attenuation factor alpha, that is: α=C * (a
1f
4+ a
2f
2+ a
3F), wherein f is a ultrasonic frequency, a
1Be scatter attenuation item, a
2Be suspended particles internal friction attenuation term, a
3Be viscous-damping item, a
1, a
2And a
3Relevant with the slurry material.
The signal that temperature sensor spreads out of in the integrated sensor carries out temperature compensation by input microprocessor after the processes temperature signal processing of circuit to the slurry flow Q and the concentration C that record, draws the slurry concentration flow C * Q with temperature compensation at last.
A kind of integrated form slurry concentration flow on-line measurement system, on the tube wall of the isolated pipe that the slurry that it is characterized in that conducting electricity is flowed through integrated sensor is installed, the structure of integrated sensor is: two potential electrode of electromagnetic flow transducer are hollow shape, ultrasound wave receiving transducer and ultrasonic emitting are integrated in respectively in two hollow shape potential electrode of electromagnetic flow transducer, temperature sensor is fixed on outside the potential electrode in two hollow shape potential electrode of electromagnetic flow transducer, forms three kinds of set of sensors and is integral.A ultrasound emission circuit connects the ultrasound wave receiving transducer, and ultrasound transmitting transducer connects a ultrasound wave receiving circuit, the potential electrode of electromagnetic flow transducer connects a flow signal metering circuit, temperature sensor connects a processes temperature signal circuit, ultrasound wave receiving circuit, Temperature Treatment circuit and temperature signal measurement circuit are connected microprocessor through IO interface, microprocessor connects a field circuit and ultrasonic transmit circuit through IO interface, and field circuit connects field coil.
The present invention compared with prior art, have following conspicuous outstanding feature and remarkable advantage: the present invention adopts integrated sensor, in a place of pipeline on-line measurement simultaneously flow, concentration and intensity, input microprocessor carries out temperature compensation to measurement of concetration, adopt digital form, eliminate under the integrated mode between the electromagnetic flow transducer and ultrasonic sensor signal intercouple and mutually mutual interference handle, so the slurry concentration flow C that records * Q precision height.Using system of the present invention, simple in structure, cost is low, stability and reliability height.Be applicable to light industry, environmental protection, field of food, especially the slurry concentration flow on-line measurement in the field of papermaking.
Description of drawings:
Fig. 1 is that the integrated sensor of one embodiment of the invention and field coil are installed in the structural representation on the tested pipeline.
Fig. 2 is a measuring system block scheme of the present invention.
Embodiment:
A preferred embodiment of the present invention is: referring to Fig. 1 and Fig. 2, this integrated form slurry concentration flow on-line measurement system is: by shown in Figure 1, ultrasound wave receiving transducer 3 being housed, adorning the potential electrode of electromagnetic flow transducer 5 of temperature sensor 7 and the potential electrode that the electromagnetic flow transducer 6 of ultrasound transmitting transducer 4 is housed outward and be installed on the left and right side tube wall of tested pipeline 1 in the integrated sensor 24, field coil 8,9 is installed in the upper and lower sides of tested pipeline 1.By shown in Figure 2, ultrasonic transmit circuit 17 connects ultrasound transmitting transducer 4, and ultrasound wave receiving transducer 3 connects ultrasound wave receiving circuit 18, two potential electrode connection traffic circuitry for signal measurement 19 of electromagnetic flow transducer 5,6, temperature sensor 7 connects processes temperature signal circuit 21, ultrasound wave receiving circuit 18, processes temperature signal circuit 21, flow signal metering circuit 19 connect microprocessor 23 through IO interface 22, and microprocessor 23 connects field circuit 20 and ultrasonic transmit circuit 17 through IO interface 22.
In conjunction with illustrated in figures 1 and 2, this integrated form slurry concentration flow On-line Measuring Method is as follows:
Under the control of microprocessor 23, adopt the method for square wave excitation, field circuit 20 makes field coil 8 and 9 produce uniform magnetic field 2.According to the law of electromagnetic induction, when flow velocity in the isolated pipe 1 is the conduction slurry flow direction of V during perpendicular to magnetic field 2, installs on two potential electrode of electromagnetic flow transducer 5,6 perpendicular to magnetic field 2 and flow direction simultaneously and will produce induced potential E.Measure induced potential E also just can obtain slurry with formula E=K * B * Q flow Q by flow signal metering circuit 19.K is the electromagnetic flow transducer constant in the formula, and B is a magnetic field intensity.
For the measurement of slurry flow, the graininess of slurry flow also can make the electromagnetic flow transducer signal produce hydrodynamic noise.Though the electrode diameter of electromagnetic flow transducer hour zero point drift is less but be easy to generate the fluid hydrodynamic noise, and electrode diameter when big the fluid hydrodynamic noise diminish and be easy to generate zero point drift.Simultaneously, high excitation frequency (when being higher than 50/8Hz) is easier to distinguish the fluid hydrodynamic noise on signal.Among the present invention, under the bigger situation of electrode diameter, we adopt feedback signal amplifying treating method, make electromagnetic flowmeter not only amplify signal but also can dynamically eliminate zero point drift and overcome hydrodynamic noise under higher excitation frequency (50/2Hz).Ultrasound wave in the electrode is transmitted to by electrode on the surface of contact of electrode and tested slurry and pulverizes dirt and attachment, to arrive the purpose that the automated cleaning electrode connects the liquid surface, improves the signal zero drift.
Ultrasound wave is propagated in the compressional wave mode in slurry, pass slurry particles after its amplitude decay i.e. ξ x=ξ o * e by index law with propagation distance
-α xIn the formula, ξ o is an original amplitude; ξ x is the amplitude of sonic propagation after apart from x; X is the distance of sonic propagation; α is the acoustic attenuation coefficient.According to the theory of acoustic attenuation, certain when fluid media, the acoustic attenuation factor alpha is directly proportional with fluid concentrations C, that is: α=C * (a
1f
4+ a
2f
2+ a
3F), wherein f is a ultrasonic frequency, a
1Be scatter attenuation item, a
2Be suspended particles internal friction attenuation term, a
3Be viscous-damping item, a
1, a
2And a
3Relevant with the slurry material.。So, can measure the concentration C of slurry as long as determine hyperacoustic relative attenuation between transmitting terminal and receiving end.
Under the control of microprocessor 23, ultrasonic transmit circuit 17 produces driving pulse according to the frequency of operation of setting.Ultrasound transmitting transducer 4 is under the excitation of pulse, and the wafer vibration is to the ultrasound wave of the slurry emission certain frequency that flows.At receiving end, make the wafer of ultrasound wave receiving transducer 3 produce vibration through the overdamping ultrasonic signal.Ultrasound wave receiving transducer 3 ultrasonic signal after decay converts electric signal to and sends into ultrasound wave receiving circuit 18, treatedly obtains corresponding concentration signal.Ultrasound wave receiving circuit 18 adopts the theory of software radios, directly with digital wave detector signal is carried out A/D and changes at intermediate frequency, then in numeric field with the DSP method to signal decompose, detection and filtering.Defectives such as the dynamic range that has overcome traditional simulation demodulation method existence like this is little, precision is low.Measuring reliability and precision have been improved.
Because the temperature of slurry has bigger influence to hyperacoustic decay, measure the temperature T of slurry by temperature sensor 7 and processes temperature signal circuit 21, measurement of concetration is carried out temperature compensation.
The flow signal that records, concentration signal and temperature signal all are admitted in the microprocessor 23 and handle.The present invention adopts method for digitizing, eliminates under the integrated mode mutual coupling between the electromagnetic flow transducer and ultrasonic sensor signal and closes with mutual interference and handle.The wide region compensation technique of using curve to combine with model, according to different in flow rate, temperature and ultrasound wave frequency of operation to slurry concentration measurement revise in real time.At last, the concentration flow that draws slurry is C * Q.
Claims (5)
1. integrated form slurry concentration flow On-line Measuring Method, it is characterized in that making the conduction slurry isolated pipe (1) of flowing through, produce uniform magnetic field by field coil (8,9), thereby adopt electromagnetic flow transducer (5,6), ultrasound wave to accept transducer (3) and ultrasound transmitting transducer (4) and the integrated integrated sensor (24) of temperature sensor (7), carry out online slurry flow, concentration and temperature detection simultaneously, at last above-mentioned three detected values are handled by microprocessor (23), obtained to have the slurry concentration flow value of temperature compensation.
2. integrated form slurry concentration flow On-line Measuring Method according to claim 1, it is characterized in that in isolated pipe (1) under the situation of conduction slurry flow direction perpendicular to magnetic field (2), by electromagnetic flow transducer (5 in the integrated sensor (24), 6) pair of electrodes perpendicular to magnetic field (2) and flow direction installation the time records flow signal, and measure two interpolar induced potential E by flow signal metering circuit (19), calculate slurry flow Q:E=K * B * Q by following formula by microprocessor (23), K is the electromagnetic flow transducer constant in the formula, and B is a magnetic field intensity.
3. integrated form slurry concentration flow On-line Measuring Method according to claim 1, it is characterized in that ultrasound wave receiving transducer (3) propagates ultrasound wave with ultrasound transmitting transducer (4) in the integrated sensor (24) in the compressional wave mode in slurry, and the ultrasonic signal after its receiving end spreads out of decay, measure hyperacoustic relative attenuation between transmitting terminal and receiving end by ultrasound wave receiving circuit (18), by following formula by calculating the concentration C of slurry by microprocessor (23):
ξ x=ξ o * e
-α x, ξ in the formula
0Be original amplitude, ξ x is the amplitude after the sonic propagation x distance, and x is the sonic propagation distance, and α is the acoustic attenuation coefficient, and slurry concentration C is directly proportional with the acoustic attenuation factor alpha, that is:
α=C * (a
1f
4+ a
2f
2+ a
3F), wherein f is a ultrasonic frequency, a
1Be the attenuation term that shines, a
2Be suspended particles internal friction attenuation term, a
3Be viscous-damping item, a
1, a
2And a
3Relevant with the slurry material.
4. integrated form slurry concentration flow On-line Measuring Method according to claim 1, it is characterized in that the signal that temperature sensor (7) spreads out of in the integrated sensor (24), handle back input microprocessor (23) by processes temperature signal circuit (21) the slurry flow Q and the concentration C that record are carried out temperature compensation, draw slurry concentration flow C * Q at last with temperature compensation.
5. integrated form slurry concentration flow on-line measurement system is installed integrated sensor (24) on the tube wall of the isolated pipe (1) that the slurry that it is characterized in that conducting electricity is flowed through; The structure of integrated sensor (24) is: two potential electrode of electromagnetic flow transducer (5,6) are hollow shape, ultrasound wave receiving transducer (3) is integrated in respectively in two hollow shape potential electrode of electromagnetic flow transducer (5,6) with ultrasound transmitting transducer (4), temperature sensor (7) is fixed on outside the potential electrode in two hollow shape potential electrode of electromagnetic flow transducer (5,6), forms three kinds of set of sensors and is integral; A ultrasound emission circuit (17) connects ultrasound transmitting transducer (4), and ultrasound wave receiving transducer (3) connects a ultrasound wave receiving circuit (18), electromagnetic flow transducer (5,6) potential electrode connects a flow signal metering circuit (19), temperature sensor (7) connects a processes temperature signal circuit (21), ultrasound wave receiving circuit (18), Temperature Treatment circuit (21) is connected microprocessor (23) with temperature signal measurement circuit (19) through IO interface (22), microprocessor (23) connects a field circuit (20) and ultrasonic transmit circuit (17) through IO interface (22), and field circuit (20) connects field coil (8,9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021577382A CN1184483C (en) | 2002-12-24 | 2002-12-24 | Integrated in-situ measuring method and system of slurry density and flow rate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021577382A CN1184483C (en) | 2002-12-24 | 2002-12-24 | Integrated in-situ measuring method and system of slurry density and flow rate |
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|---|---|
| CN1421702A CN1421702A (en) | 2003-06-04 |
| CN1184483C true CN1184483C (en) | 2005-01-12 |
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| CNB021577382A Expired - Fee Related CN1184483C (en) | 2002-12-24 | 2002-12-24 | Integrated in-situ measuring method and system of slurry density and flow rate |
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Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102005039223A1 (en) * | 2005-08-17 | 2007-02-22 | Endress + Hauser Flowtec Ag | Magnetic-inductive flowmeter |
| CN100387940C (en) * | 2005-12-23 | 2008-05-14 | 李斌 | Electromagnetic flow sensor of non-insulated measuring pipe |
| CN100375891C (en) * | 2006-07-21 | 2008-03-19 | 上海大学 | Electromagnetic flow sensor for measuring non-full pipe flow and method for measurement |
| US9207212B2 (en) * | 2012-06-18 | 2015-12-08 | Krohne Messtechnik Gmbh | Method for operating a resonant measurement system |
| CN103728371B (en) * | 2014-01-18 | 2016-04-27 | 河北联合大学 | Filling in mine slurry parameter detection method and monitoring device |
| CN104316118B (en) * | 2014-07-10 | 2018-01-02 | 上海大学 | Become the electromagnetic flowmeter of excitation frequency |
| CN104266694A (en) * | 2014-10-21 | 2015-01-07 | 中山欧麦克仪器设备有限公司 | Intelligent electromagnetic flowmeter for measuring size |
| EP3317617B1 (en) * | 2015-06-30 | 2020-06-17 | Micro Motion Inc. | Magnetic flowmeter with automatic in-situ self-cleaning |
| DK3317658T3 (en) * | 2015-07-03 | 2020-11-30 | Kamstrup As | TURBIDITY SENSOR BASED ON ULTRASOUND MEASUREMENTS |
| CN105509823B (en) * | 2015-12-02 | 2019-10-11 | 上海大学 | Electromagnetic flowmeter |
| CN105571660A (en) * | 2015-12-16 | 2016-05-11 | 宁波水表股份有限公司 | Micro-power-consumption excitation electromagnetic flow transducer |
| DE102017110736A1 (en) * | 2017-05-17 | 2018-11-22 | Bürkert SAS | measuring device |
| CN108801539B (en) * | 2018-07-12 | 2023-09-19 | 中交疏浚技术装备国家工程研究中心有限公司 | Wireless-based system and method for synchronously measuring along-path pressure of slurry conveying pipeline |
| CN113007607B (en) * | 2021-03-02 | 2022-04-26 | 东北大学 | Deep well filling pipeline operation condition ultrasonic diagnosis system and method |
| CN113358169B (en) * | 2021-05-31 | 2022-02-01 | 成都朗锐芯科技发展有限公司 | Automatic calibration compensation method and device for Hall flow sensor |
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