Chemical engineering applications of electrical process tomography

Electrical tomographic imaging has been applied to a broad range of chemical engineering processes, including: bubble columns, fluidised beds, pneumatic transport, liquid mixing, cyclonic separation, pressure filtration, liquid pipe-flow, polymerisation, emergency depressurisation, and paste extrusion. Two imaging approaches are described, electrical capacitance tomography (ECT) and electrical impedance tomography (EIT). To date, these have primarily been used as low-cost research tools for studying process dynamics, although they potentially may also act as sensors permitting on-line monitoring and control. Various aspects of design, operation and data processing are described, along with a review of applications in the literature.

[1]  Jari P. Kaipio,et al.  Modelling of internal structures and electrodes in electrical process tomography , 2001 .

[2]  Mi Wang,et al.  Electrical resistance tomography for process applications , 1996 .

[3]  Willis J. Tompkins,et al.  Comparing Reconstruction Algorithms for Electrical Impedance Tomography , 1987, IEEE Transactions on Biomedical Engineering.

[4]  C. M. van den Bleek,et al.  Image reconstruction of an electrical capacitance tomography system using an artificial neural network , 1999 .

[5]  Simon J. Cox,et al.  Efficient Non-Linear 3D Electrical Tomography Reconstruction , 2001 .

[6]  E. K. Kemsley,et al.  Image improvement in soft-field tomography through the use of chemometrics , 1998 .

[7]  R B White,et al.  Internal Structures in Fluid Beds of Different Scales: An Application of Electrical Capacitance Tomography. , 1999 .

[8]  Mark A. Bennett,et al.  Measurement of bulk particulates on belt conveyor using dielectric tomography , 2000 .

[9]  Eric Hervieu,et al.  Direct Imaging of Two-Phase Flows by Electrical Impedance Measurements , 1998 .

[10]  Artur J. Jaworski,et al.  A portable capacitance probe for detection of interface levels in multi-phase flows – A case study , 1999 .

[11]  David M. Scott,et al.  ECT Studies of Bead Fluidization in Vertical Mills , 1999 .

[12]  C. J. Kotre,et al.  EIT image reconstruction using sensitivity weighted filtered backprojection. , 1994, Physiological measurement.

[13]  H Griffiths,et al.  An electrical impedance tomography microscope. , 1996, Physiological measurement.

[14]  Mark A. Bennett,et al.  Application-specific optimization of regularization for electrical impedance tomography , 2001 .

[15]  Dieter Mewes,et al.  Recent developments and industrial/research applications of capacitance tomography , 1996 .

[16]  Xiaodong Jia,et al.  Analysis and flow regime identification of bubble column dynamics , 1999 .

[17]  Martin Schweiger,et al.  Electrical Impedance and Diffuse Optical Tomography Reconstruction Software , 1999 .

[18]  Tomasz Dyakowski,et al.  Detecting filter-cake pathologies in solid–liquid filtration: semi-tech scale demonstrations using electrical resistance tomography (ERT) , 2000 .

[19]  William R B Lionheart,et al.  Reconstruction Algorithms for Permittivity and Conductivity Imaging , 2001 .

[20]  Mi Wang,et al.  Measurements of gas-liquid mixing in a stirred vessel using electrical resistance tomography (ERT) , 2000 .

[21]  Mi Wang,et al.  Measuring Flowing Foam Density Distributions Using ERT , 1999 .

[22]  Feng Dong,et al.  The design of a dual-plane ERT system for cross correlation measurement of bubbly gas/liquid pipe flow , 2001 .

[23]  Trevor A. York.  Status of electrical tomography in industrial applications , 2001, J. Electronic Imaging.

[24]  Yewang Su,et al.  Investigation of square fluidized beds using capacitance tomography: preliminary results , 2001 .

[25]  Tomasz Dyakowski,et al.  Application of electrical capacitance tomography for measurement of gas-solids flow characteristics in a pneumatic conveying system , 2001 .

[26]  J Kaipio,et al.  Generalized optimal current patterns and electrical safety in EIT. , 2001, Physiological measurement.

[27]  Reidar Barfod Schüller,et al.  Advanced Profile Gauge for Multiphase Systems , 1999 .

[28]  A Arko,et al.  Development of Electrical Capacitance Tomography for Solids Mass Flow Measurement and Control of Pneumatic Conveying Systems , 1999 .

[29]  Robert West,et al.  Parametric modelling in industrial process tomography , 2000 .

[30]  B. T. Hjertaker.  Static characterization of a dual sensor flow imaging system , 1998 .

[31]  Tom Dyakowski,et al.  Imaging nylon polymerisation processes by applying electrical tomography , 2000 .

[32]  P. Wright,et al.  Application of Process Tomography as a Tool for Better Understanding of Fluidization Quality in a Conventional Fluidized Bed , 2001 .