chairman : hung -chi yang presenter: han-yang liu adviser :dr. ji- jer huang from from s. xin h....
TRANSCRIPT
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EXTENSIBLE ELECTRICAL CAPACITANCE TOMOGRAPHY
SYSTEM FOR GAS–LIQUID TWO-PHASE FLOW
Chairman :Hung -Chi YangPresenter: Han-Yang Liu
Adviser :Dr. Ji- Jer Huang
From S. Xin H. Wang, “Extensible electrical capacitance tomography systemfor gas–liquid two-phase flow” IET Image Process., 2011, Vol. 5, Iss. 5, pp. 500–507
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OutlineIntroduction
Materials and Methods
Conclusions
References
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IntroductionApplications of electrical capacitance tomography (ECT)
oil pipelines
chemical applications
fluidized beds
pneumatic conveying
trickle bed reactors
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Introduction Gas/liquid two-phase flow systems are often
encountered in many chemical and industrial processes
oil-gas two-phase flow in the petroleum industry
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IntroductionElectrical capacitance tomography (ECT)
Non-invasive imaging technology
flow regime identification of the two-phase flow
void fraction measurement of the two-phase flow
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IntroductionFPGA acts Microcontroller A high-speed data
transmission unit
DSP performs only as a coprocessor for ultra high speed
data processing for reconstruction algorithm
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IntroductionAn ECT system commonly contains three main units
The sensor array
The sensing electronics
The computer system
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IntroductionThe identification results of stratified flow, wavy stratified
flow, plug flow and slug flow
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IntroductionThe new system can support 16 or 32 electrodes working
in multi-frequency model
An additional ERT system can be easily embedded into the new ECT system for dual imaging of permittivity and conductivity to form a dual-modality system
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Materials and Methods
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Materials and MethodsFPGA is the most important part of the ECT system
Logical controlsData processing Data transfer
DSP is mainly in charge of reconstruction algorithm in this system
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Materials and MethodsECT sensing electrode array was established by using the
software COMSOL.
The uniformity of sensitivity field distribution
The correlation coefficient
The reconstructed image space resolution
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Materials and Methods
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Materials and Methods
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Materials and Methods
Direct Digital Synthesiser (DDS)
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Materials and Methods
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Materials and Methods Multi-frequency demodulation
Discrete Fourier transform (DFT) demodulation
Quadrature demodulation
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Materials and MethodsDFT demodulation sampling frequency and data length
Amplitude and phase angle of sineMeasured signal will correspond with with the frequency
point Complex impedance
DFT (non-integer-period sampling)Energy leakageFence effect
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Digital quadrature demodulation
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Materials and Methods
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Materials and Methods
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Conclusions
L ?1000
L =1000, 79.8 dB
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Conclusions
All the images are obtained using LBP algorithm
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Conclusions
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Conclusions
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ConclusionsSNR of this system is up to 79.8 dB
Real-time imaging speed is about 280 frames/s
Dual-frequency model with LBP algorithm
High real-time and smaller average error
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Thank you for your attention
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ReferencesJ. Braz. Soc. Mech. Sci. & Eng. vol.27 no.1 Rio de
Janeiro Jan./Mar. 2005S. Xin H. Wang, “Extensible electrical capacitance
tomography system for gas–liquid two-phase flow” IET Image Process., 2011, Vol. 5, Iss. 5, pp. 500–507
Ziqiang Cui1, HuaxiangWang, Zengqiang Chen1,
Yanbin Xu andWuqiang Yang, “A high-performance digital system for electrical capacitance tomography” Meas. Sci. Technol. 22 (2011) 055503 (10pp)