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Characterization of fibers flow using EIT: results from Coimbra pilot rig

COST Action - FP1005 joint 4nd MC/WG Meeting 4th ERCOFTAC SIG43 Workshop “Fibre suspension flow modelling - a key for innovation and competitiveness in the pulp & paper industry ”. Pedro Faia. Characterization of fibers flow using EIT: results from Coimbra pilot rig.

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Characterization of fibers flow using EIT: results from Coimbra pilot rig

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  1. COST Action - FP1005 joint 4nd MC/WG Meeting 4th ERCOFTAC SIG43 Workshop “Fibre suspension flow modelling - a key for innovation and competitiveness in the pulp & paper industry” Pedro Faia Characterization of fibers flow using EIT: results from Coimbra pilot rig 24-26 October, 2012, Throndeim, Norway DEEC/FCT Universityof Coimbra Portugal

  2. Characterization of fibers flow using EIT: results from Coimbra pilot rig. Presentation Outline • Brief Introduction. • Electrical Impedance Tomography. • Mathematical formulation. • Fiber-flow Tomography first tests.

  3. Characterization of fibers flow using EIT: results from Coimbra pilot rig. ElectricalImpedanceTomographyoverview In the development of accurate models for suspension related processes, prior knowledge of several flow characteristics is essential, such as spatial distribution of phases, flow regimen, interfacial area, and relative velocity between phases, amongst others.

  4. Characterization of fibers flow using EIT: results from Coimbra pilot rig. MathematicalFormulation Complete Electrode Model (CEM) Regularized Gauss-Newton algorithm

  5. Characterization of fibers flow using EIT: results from Coimbra pilot rig. PILOT RIG overview

  6. Characterization of fibers flow using EIT: results from Coimbra pilot rig. EIT data protocols Adjacentinjectionandmeasuring

  7. Characterization of fibers flow using EIT: results from Coimbra pilot rig. EIT data protocols Opositeinjectionandadjacentmeasuring data collection experimental procedure data collection typical procedure

  8. Characterization of fibers flow using EIT: results from Coimbra pilot rig. Some sensitivity results For alldescribedtests a meshwith2304 triângularelementsand1201 nodes wasused (otherparameters: contact impedance considered : 0,67 Ohm; applied injected current amplitude : 0,36 mA) MajourlyOpositeinjectionandadjacentmeasuringwasused; For theflow rate 0 m3/h, Adjacentinjectionandmeasuringwasusedinstead; For thetestsdepicted, Eucaliptus short fibers, with a lenghtof 0,706±0,03 mm, andwith a concentrationof ± 0.159 % (m/m) wereused;

  9. Characterization of fibers flow using EIT: results from Coimbra pilot rig. Constantflowtesting Twomediumwereused as references for thefirsttests: industrial waterandwater, bothwith similar conductivity 1197 mS (at 35 Cº); Insiderigsectionof 0.157 m2.

  10. Characterization of fibers flow using EIT: results from Coimbra pilot rig. Constantflowtesting Industrial water 3,75 (m3/h) Industrial water Water Water 28,4 (m3/h)

  11. Characterization of fibers flow using EIT: results from Coimbra pilot rig. Constantflowtesting Industrial water 41,4 (m3/h) Industrial water Water Water 51,5 (m3/h)

  12. Characterization of fibers flow using EIT: results from Coimbra pilot rig. Constantflowtesting Industrial water 72 (m3/h) Industrial water Water Water 83,7 (m3/h)

  13. Characterization of fibers flow using EIT: results from Coimbra pilot rig. Electrodes material comparison 0 (m3/h) Flow rate: 0 m3/h. Reference medium :water Stainless stell Titanium

  14. Characterization of fibers flow using EIT: results from Coimbra pilot rig. • Next steps • New batch’s of eucaliptus fibers with concentrations up to 3-4% will be used. • Other type of fibers, for instance pine, will be tested.

  15. Thank youfor you attention Characterization of fibers flow using EIT: results from Coimbra pilot rig.

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