CN107561461A - A kind of high magnetic permeability catalyst fluidized bed electricity imaging sensor - Google Patents
A kind of high magnetic permeability catalyst fluidized bed electricity imaging sensor Download PDFInfo
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- CN107561461A CN107561461A CN201710585191.6A CN201710585191A CN107561461A CN 107561461 A CN107561461 A CN 107561461A CN 201710585191 A CN201710585191 A CN 201710585191A CN 107561461 A CN107561461 A CN 107561461A
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- magnetoresistive transducer
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Abstract
The present invention relates to a kind of high magnetic permeability catalyst fluidized bed electricity imaging sensor, detected for being pointed to high magnetic permeability catalyst identification in the multiphase flow system of pillars field areas with distributed mutually, magnetoresistive transducer and electro-magnetic screen layer, excitation coil and magnetoresistive transducer are placed in inside electro-magnetic screen layer including M excitation coil, N；Each excitation coil has individually excitation passage；Excitation coil is arranged on the same section outside pillars field areas；Each pair of magnetoresistive transducer is also arranged herein on same section, and excitation coil is arranged in from magnetoresistive transducer on different circumference, and each pair magnetoresistive transducer is respectively positioned on inside some excitation coil；Each pair magnetoresistive transducer can detect the magnetic field size of object field radially and tangentially.
Description
Technical field
The invention belongs to the heterogeneous fluid imaging field of fluidization technology, more particularly to magnetic conductivity electricity tomography fills
Put.
Background technology
Fluidization technology has very high heat transfer and mass-transfer efficiency and the ability of a large amount of processing particles, extensive use
The gasification of burning, coal in solid fuel and coking, the conveying of solid material, the gas in Chemical Manufacture, solid catalysis reaction,
The field such as dry materials, heating and cooling, petroleum cracking, metallurgy, environmental protection, and its application field is also constantly expanding.
The identification of multiphase fluid mapper process multiphase is most important, and the especially identification of solid-phase catalyst and the monitoring of distribution can
Effectively avoid the abnormal fluidized state such as bulla, slugging and channel, improve production efficiency, instruct the designing of fluid bed, industry amplification
And optimization.The raising of solid loading is advantageous to improve the volume utilization of reactor, so as to improve reaction rate and production concentration,
Can also there is the traditional measurement side such as situations such as local granule accumulation, conducting probe, Pitot tube, optical fiber probe, ultrasonic probe simultaneously
Method all cisco unity malfunctions easily damage.
In conventional gas-liquid is solid three-phase fluid bed, gas phase is generally air, hydrogen etc., and liquid phase is water or oil, and solid phase is to urge
Agent.Gas phase, liquid phase do not have magnetic conductivity typically, and catalyst per se with high magnetic permeability or can make it by modified mode
With high magnetic permeability, solid phase is substantially distinguished from gas-liquid two-phase on magnetic conductivity.The electromagnetic chromatography imaging technique sensitive to magnetic conductivity
(Electromagnetic Tomography, abbreviation EMT) has the characteristics of radiationless, to be suitable for opaque tube wall and fluid can
Realize mutually identification and the distribution measuring of solid-phase catalyst, and its temporal resolution is up to Millisecond, fully meet fluid bed compared with
Measurement request under the conditions of high apparent gas phase and liquid velocity.
Traditional EMT uses coil stimulating Coil Detector mode, and measuring coil sensitivity is directly proportional to frequency, and improves
Frequency, application of the technology on large scale fluid bed can be limited again.Simultaneously because the size of coil is not easy the very little designed, this
Limit the number and accuracy of detection of excitation detection coil.
Traditional EMT is based primarily upon vortex principle, and point of electrical conductivity is obtained by the induced-current (secondary field information) of coil
Cloth, and then the differentiation for the phase realized, secondary field field strength are relatively weak so that EMT accuracy of detection is severely limited, in order to improve
The induced-current of coil brings serious test and cost consumption, it is necessary to improve the amplitude and frequency of excitation field for exciting circuit.
The content of the invention
The purpose of the present invention is overcome the shortcomings of in prior art, there is provided one kind is used for high magnetic permeability in multiphase flow system and urged
Agent identifies and the high sensitivity of distributed mutually detection, good reliability sensor.The technical scheme that the present invention takes is：
A kind of high magnetic permeability catalyst fluidized bed electricity imaging sensor, for being pointed to the multiphase flow of pillars field areas
The identification of high magnetic permeability catalyst detects with distributed mutually in system, including M excitation coil, N are to magnetoresistive transducer and electromagnetic shielding
Layer, excitation coil and magnetoresistive transducer are placed in inside electro-magnetic screen layer；Each excitation coil has individually excitation passage；Swash
Coil configuration is encouraged on the same section outside pillars field areas；Each pair of magnetoresistive transducer is also arranged same section herein
On, excitation coil is arranged in from magnetoresistive transducer on different circumference, and each pair magnetoresistive transducer is respectively positioned on some excitation coil
It is internal；Each pair magnetoresistive transducer can detect the magnetic field size of object field radially and tangentially.
Brief description of the drawings
Fig. 1 is electromagnetic chromatographic imaging system structural representation
Fig. 2 illustrates the structure of electromagnetic chromatographic imaging system.In figure, 1 represents outer layer electro-magnetic screen layer；2 represent pipeline；3
Excitation coil is represented, shares 8 excitation coils in Fig. 2, it is expansible in real system, if the number of excitation coil is M；4 tables
Show the magnetoresistive transducer of two kinds of different placement directions, each two is one group, respectively has one group in the center of each coil, its is quick
Sense direction of principal axis is mutually perpendicular to, and is respectively used to measure magnetic field intensity axially and radially.
5 expression thing field areas.8 pairs, i.e. 16 magnetoresistive transducers are illustrated in Fig. 2, it is actual expansible, if magnetoresistive transducer
Number be N pairs.
Fig. 3 electromagnetic chromatographic imaging system Sensor Design sectional views
In figure, 1：Electromagnetism magnetic masking layer 2：Pipeline 3：Excitation coil 4：Magnetoresistive transducer 5：Object field region.
Fig. 4 illustrates magnetoresistive transducer sensitivity direction of principal axis
5 expression thing field areas in figure, 8 and 9 be a pair of magnetoresistive transducers, measures the tangential and radial magnetic field of the position respectively
Intensity.
Fig. 5 employs the structural representation of one embodiment of the electromagnetic chromatographic imaging system of sensor of the invention
Embodiment
The present invention devises fluidization electromagnetic chromatographic magnetoresistive transducer array, for being pointed to pillars field areas
The identification of high magnetic permeability catalyst detects with distributed mutually in multiphase flow system.Magnetic approach is directly detected by magnetic resistance, magnetic can be obtained
Conductance is distributed, and realizes that magnetic conductivity distribution parameter measurement is imaged with magnetic conductivity.Magnetoresistive transducer, detection sensitivity are not excited exciting field
The influence of frequency, substantially increases the scope of application, simultaneously because it has, high sensitivity, good reliability, measurement range be wide, anti-evil
The advantages that bad environment, small volume, is more and more favored.Introduce magnetoresistive transducer, because its size is small, generally 5mm with
It is interior, the direct detection radially and tangentially in magnetic field can be achieved, increase test point number, improve the detection sensitivity of system, simultaneously
Reduce the demand to driving frequency.The EMT technologies that magnetic conductivity distribution is rebuild are designed, it is solid by magnetic conductivity distribution situation, identification
Phase information simultaneously obtains its distributed image, and then to realize mutually identification and distribution parameter measurement with permeability substance.
Distribution of Magnetic Field can be changed when high magnetic permeability catalyst is placed in magnetic field space, magnetic field line density at high magnetic permeability material
Greatly, while solid-phase catalyst can also produce faradic secondary field.Traditional EMT is using coil as field sensing component, mainly
Principle based on vortex secondary field.Magnetic conductivity distribution can be directly obtained using magnetic resistance detection primary field, so as to obtain solid phase identification
With distribution.The field strength of primary field will be significantly larger than faradic secondary field, and the use of magnetoresistive transducer can improve accuracy of detection,
Hardware design limitation and cost are reduced simultaneously.
Because other coils can also influence the distribution in magnetic field near eddy current effect；But magnetic resistance as field sensing component just
Be not in such case, this reduces the difficulty of image reconstruction.
Magnetoresistance refers to the phenomenon that the resistance value of some metals or semiconductor changes and changed with externally-applied magnetic field.This
Invention make use of high sensitivity characteristic of the magnetic resistance to magnetic field, directly detects magnetic field intensity with it, overcomes traditional EMT Coil Detectors
The problem of sensitivity is low under low frequency condition.
Electromagnetic chromatographic sensor is designed using magnetoresistive array, and magnetoresistive transducer can be divided into normal magnetic resistance
(Ordinary Magneto resistance, OMR), giant magnetoresistance (Giant Magneto resistance, GMR), super huge magnetic
Hinder (Colossal Magneto resistance, CMR), incorgruous magnetic resistance (Anisotropic magneto resistance,
AMR), tunnel magneto-resistance effect (Tunnel Magneto resistance, TMR), the change of normal magnetic resistance resistance is typically smaller than 5%,
Super giant magnetoresistance phase transition temperature is relatively low, and incorgruous magnetic resistance is adapted to weak magnetic measurement, considers accuracy of detection and excitation field scope GMR
It is applied to the system with TMR.
Electromagnetic chromatographic sensor as shown in Figure 3, every group of magnetoresistive transducer are devised in order to improve detection sensitivity
Sensitive direction of principal axis as shown in figure 4, detect object field radially and tangentially magnetic field, radial magnetic field a+bi, tangential magnetic field strength c respectively
+ di, then the magnetic field is x+yi by Vector modulation.
Illustrated with reference to the application scenarios of sensor of the invention.
In order to improve field strength and sensitivity, using symmetrical enhancing cycle motivation strategy, for shown in Fig. 3, note is as shown in the figure
The three excitation coil of position is #1, and counterclockwise is followed successively by #2 to #M (M is even number, and coil is symmetrically placed).
Identical alternating current, and two excitation coils are applied to excitation coil #1 and its symmetrical slot # M/2+1 excitation coils respectively first
Caused magnetic direction is identical, and EMT systems scan the output signal of each magnetoresistive transducer successively；Then it is right successively in such a manner
Coil #2, #3 ..., #M/2 and its symmetrical drive coil apply excitation, and measure magnetoresistive transducer output respectively, until completing complete
Portion measures, and by radial direction and the Vector modulation x+yi of tangential magnetic resistance, finally gives its modulus value composition measured value vector U (P × 1).
Gathered data are utilized to obtain sensitivity matrix S (P × Q), wherein P is independent measurement number, and Q is pixel, is swashed
It is M to encourage coil number, and the magnetoresistive transducer number of reception is N pairs, then independent measurement number P is M × N.
Sensitivity matrix inearized model is established, and it is normalized, U is that AVHRR NDVI value is vectorial in U=Sg formulas, S
It is sensitivity matrix, g is the gray value vectors for representing the relative change of material magnetic conductivity.Unknown quantity g can be solved by known U.
It is ill-condition matrix, using S but sensitivity matrix S is not square formationTInstead of inverse matrix.Build object function gμ=(STS+μI)- 1STU, wherein, I is unit matrix, and μ is regularization parameter, (STS+μI)-1STIt is the optimization weight of sensitivity field for regularization process
Build matrix.It is imaged by the gray value in each pixel.
Claims (1)
- A kind of 1. high magnetic permeability catalyst fluidized bed electricity imaging sensor, for being pointed to the heterogeneous fluid of pillars field areas The identification of high magnetic permeability catalyst detects with distributed mutually in system, including M excitation coil, N be to magnetoresistive transducer and electro-magnetic screen layer, Excitation coil and magnetoresistive transducer are placed in inside electro-magnetic screen layer.Each excitation coil has individually excitation passage；Excitation Coil configuration is on the same section outside pillars field areas；Each pair of magnetoresistive transducer is also arranged herein on same section, Excitation coil is arranged in from magnetoresistive transducer on different circumference, and each pair magnetoresistive transducer is respectively positioned in some excitation coil Portion；Each pair magnetoresistive transducer can detect the magnetic field size of object field radially and tangentially.
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| CN201710585191.6A CN107561461A (en) | 2017-07-18 | 2017-07-18 | A kind of high magnetic permeability catalyst fluidized bed electricity imaging sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109557144A (en) * | 2018-12-17 | 2019-04-02 | 天津大学 | A kind of integrated capacitive/electromagnetic double-mode state layer analysis imaging sensor |
| CN111157396A (en) * | 2020-01-16 | 2020-05-15 | 天津大学 | Observation visual angle adjustable solid combustion reactor |
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| CN101566639A (en) * | 2009-06-05 | 2009-10-28 | 天津大学 | Molten steel flow-speed measurement method and device based on electromagnetic tomography |
| CN102271577A (en) * | 2008-12-30 | 2011-12-07 | 皇家飞利浦电子股份有限公司 | Method and system for magnetic induction tomography |
| CN102428381A (en) * | 2009-03-17 | 2012-04-25 | Lg伊诺特有限公司 | System for signal detection of specimen using magnetic resistance sensor and detecting method of the same |
| CN104655656A (en) * | 2014-12-05 | 2015-05-27 | 广州丰谱信息技术有限公司 | Detection imaging method and detection imaging device based on broadband magnetic wave transmission model parameter identification |
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Patent Citations (5)
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| US20070268016A1 (en) * | 2006-05-16 | 2007-11-22 | Cheng-Chung Chi | Apparatus for detecting magnetic signals and signals of electric tunneling |
| CN102271577A (en) * | 2008-12-30 | 2011-12-07 | 皇家飞利浦电子股份有限公司 | Method and system for magnetic induction tomography |
| CN102428381A (en) * | 2009-03-17 | 2012-04-25 | Lg伊诺特有限公司 | System for signal detection of specimen using magnetic resistance sensor and detecting method of the same |
| CN101566639A (en) * | 2009-06-05 | 2009-10-28 | 天津大学 | Molten steel flow-speed measurement method and device based on electromagnetic tomography |
| CN104655656A (en) * | 2014-12-05 | 2015-05-27 | 广州丰谱信息技术有限公司 | Detection imaging method and detection imaging device based on broadband magnetic wave transmission model parameter identification |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109557144A (en) * | 2018-12-17 | 2019-04-02 | 天津大学 | A kind of integrated capacitive/electromagnetic double-mode state layer analysis imaging sensor |
| CN111157396A (en) * | 2020-01-16 | 2020-05-15 | 天津大学 | Observation visual angle adjustable solid combustion reactor |
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Application publication date: 20180109 |