PSRI Consulting

PSRI has over 160 years of experience and over 225 reviewed publications in fluidization and particle technology

Dr. S.B. Reddy Karri has 28 years experience in particle technology and fluidization. He has worked on FCC technology, cokers, polyolefin, methanol to olefins, maliec anhydride, acrylonitrile, TiO2, polycrystalline silica, gasification, pyrolysis, sulfur capture, CO2 capture, biomass and radioactive materials.

Experience

Consulting Director, Particulate Solid Research Inc., Chicago, IL — 2017 to Present

Build and manage PSRI’s consulting resources for the PSRI membership to provide state of the art equipment design, effective process design concepts, first to market development methodology and second to none training.

Technical Director, Particulate Solid Research Inc., Chicago, IL — 2006 to 2017

Develop and manage PSRI membership and contract research along with maintaining and expanding PSRI state of the art research facilities.

 

Chief Research Engineer, Particulate Solid Research Inc., Chicago, IL — 1982 to 2006

Develop and implement novel cold flow modeling experiments to meet the research needs for PSRI’s member companies.

Graduate Research Assistant, University of New Hampshire — 1982 to 1987

Liquid solid coal liquefaction process research and development.

Education

  • University of New Hampshire — PhD in Chemical Engineering, 1987
  • University of New Hampshire — MS in Chemical Engineering, 1984
  • IIT, India — BS in Chemical Engineering, 1982

Awards

  • Outstanding Graduate Teaching Assistant Award, 1987
  • AIChE PTF Fluidization Processing Award, 2011

Committees

  • Past-chair and past-cochair of the AIChE Particle Technology Forum Group 3B,  2012 to 2016
  • Industrial Liaison for AIChE Particle Technology Forum, 2016-present
  • Area Chair of the World Congress in Particle Technology in Orlando, Florida in 2018.

Skills

Fortran, Filemaker, Mathematica, Excel .NET

Publications

  • "Disposable Catalysts in Two-Stage Coal Liquefaction", S.B. Reddy Karri and V.K. Mathur, Am. Chem. Soc., Division of Fuel Chemistry,  28 (5), 210, 1983.
  • "Simulations in a Plankton Model", W.H. Hendrickson, S. B. Reddy Karri and A.O. Shar, Int. Revue Ges. Hydrobiol., 70, 547-559, 1985.
  • "Bubbling-Bed Model Computation in Fluidized Beds", I.H. Farag, R.W. Breault, S.B. Reddy Karri and K.Y. Tsai, Eighth International Conference on Fluidized Bed Combustion, March 18-21, 1985, Houston, Texas.
  • "Graphical Solution of Multistage Fluidized-Bed Heat Exchanger", I.H. Farag, S.B. Reddy Karri, R.W. Breault and K.Y. Tsai, Chem. Eng. Commun., 48 (4-6), 331-340, 1986.
  • "Ore Catalysts in Two-Stage Coal Liquefaction", S.B. Reddy Karri and V.K. Mathur, Fuel, 65 (6), 790-796, 1986.
  • "Analysis of the Performance of Non-Uniformly Active Catalyst Pellets for a Non-Isothermal Series Reaction", S.B. Reddy Karri and J. Talukdar, Chem. Eng. Commun., 52, 127-134, 1987.
  • "Heat-Mass Transfer and Reaction Conversion in Fluidized Beds Using Bubbling-Bed Model", I.H. Farag, S.B. Reddy Karri, R.W. Breault and K.Y. Tsai, Heat and Technology,  5 (1-2), 1987.
  • "Experimental Study of Simulated Micro-Gravity Vapor-Liquid Flow Regimes", S.B. Reddy Karri and V.K. Mathur, Presented at AIChE Annual Meeting, November, 1987.
  • "Bubble Dynamics in Micro-Gravity", S.B. Reddy Karri, Chem. Eng. Commun., 70, 127-135, 1988.
  • "Two-Phase Flow Regime Map Predictions Under Micro-Gravity", S.B. Reddy Karri and V.K. Mathur, AIChE J., 34 (1), 137-139, 1988.
  • "Measurement of Interfacial Tension of Immiscible Liquids of Equal Density", S.B. Reddy Karri and V.K. Mathur, AIChE J., 34 (1), 155-157, 1988.
  • "A Unifying Phase Diagram for Regimes of Fluidization",  S.B. Reddy Karri, Proceed. of Powder & Bulk Solids Conf., 137-150, May 15-18, 1989, Chicago.
  • “A Practical Definition of the Fast Fluidization Regime," S. B. Reddy Karri and T. M. Knowlton.  Paper presented at the Third International Conference on Circulating Fluidized Beds, Nagoya, Japan, October 15-18, 1990.
  • "Comparison of Group A and Group B Solids Flow in Underflow Standpipes," S. B. Reddy Karri and T. M. Knowlton, in Fluidization VII, O. E. Potter and D. J. Nicklin, Eds., 345.  New York:  Engineering Foundation, 1992.
  • "The Effect of Fines Content on the Flow of FCC Catalyst in Standpipes," S. B. Reddy Karri and T. M. Knowlton.  Proceedings of the Fourth International Circulating Fluidized Bed Conference, A. Avidan, ed.  Pittsburgh, August 1-6, 1993.
  • "A Comparison of Group A Powder Flow in Angled and Vertical Standpipes," S. B. Reddy Karri and T. M. Knowlton.  Proceedings of the Fourth International Circulating Fluidized Bed Conference, A. Avidan, ed.  Pittsburgh, August 1-6, 1993.
  • “Increasing Solids Flow Rates Through a Hybrid Angled Standpipe Using a Bypass Line,”  S. B. Reddy Karri and T. M. Knowlton. Proceedings of the Eighth International Conference on Fluidization, J. F. Large and C. LaGuerie, eds.  Tours, France, May, 1995.
  • “The Effect of Pressure on CFB Riser Hydrodynamics”, S. B. Reddy Karri and T. M. Knowlton, presented at the Fifth International Circulating Fluidized Bed Conference, Beijing, China, May 26-30, 1996.
  • “Development of a Standardized Attrition Test Procedure”, R. P. Davuluri and T. M. Knowlton, Proceedings of the Ninth International Conference on Fluidization, L.-S. Fan and T. M. Knowlton, eds.  Durango, Colorado, May 17-22, 1998.
  • “Flow Direction and Size Segregation of Annulus Solids in a Riser”, S. B. Reddy Karri and Ted M. Knowlton, Proceedings of the Ninth International Conference on Fluidization, L.-S. Fan and T. M. Knowlton, eds.  Durango, Colorado, May 17-22, 1998.
  • “Streaming Flow in Cyclone Diplegs”, S. B. Reddy Karri and T. M. Knowlton, Proceedings of the 10th International Fluidization Conference, W.-C. Yang, J. Li and M. Kwauk, eds.  Beijing, China, May 2001.
  • “Wall Solids Upflow and Downflow Regimes in Risers for Group A Solids”, S.B. Reddy Karri and T.M. Knowlton, Proceedings of the 7th International Conference on Circulating Fluidized Beds, J. Grace, J. Zhu and H. de Lasa, editors, Page 310. Niagara Falls, Ontario Canada, May 5-8, 2002.
  • “Scale-up of Fluidized Bed Hydrodynamics”, T. M. Knowlton, S. B. Reddy Karri and A. Issangya, American Institute of Chemical Engineers Annual Meeting, Indianapolis, Indiana, November 3-8, 2002.
  • “The Effect of Aeration on the Operation of Cyclone Diplegs Fitted With Trickle Valves” S. B. Reddy Karri and T. M. Knowlton, I & EC Fundamentals, September, 2004.
  • “Gas Bypassing in Deep Fluidized Beds” S. B. Reddy Karri, A. Issangya and T. M. Knowlton, Presented at the Fluidization XI Conference in Ischia, Italy, May 9-14, 2004.
  • “Hydrodynamic Scale-UP of Circulating Fluidized Beds” T.M. Knowlton, S.B. Reddy Karri, and J.S. Smith, Proceedings of 12th International Fluidization Conference, X. Bi, F. Berruti, and T. Pugsley, eds.  Hot Springs, Canada, pp. 1-14, May 2007.
  • “Detection of Gas Bypassing Due to Jet Streaming in Deep Fluidized Beds of Group A Particles” A. S. Issangya, , T.M. Knowlton ,a nd S.B. Reddy Karri,, Proceedings of 12th International Fluidization Conference, X. Bi, F. Berruti, and T. Pugsley, eds.  Hot Springs, Canada, pp. 775-782, May 2007.
  • “Effect of Baffles on Jet Streaming in Deep Fluidized Beds of Group A Particles” A. S. Issangya, , S.B. Reddy Karri, and T.M. Knowlton, Proceedings of Ninth International Circulating Fluidized Bed Conference, Hamburg, Germany, pp. 105-110, May 13-16, 2008.
  • “Small Particle Cluster Formation in Fluidized Beds and its Effect on Entrainment” R. Hays, S.B. Reddy Karri, R. Cocco, and T.M. Knowlton, Proceedings of Ninth International Circulating Fluidized Bed Conference (Eds. J. Werther, W. Nowak, K.E. Worth and E.U. Hartge), Hamburg, Germany, pp. 93-97, May 13-16, 2008.
  • “Measuring Particle Attrition in a Jet Cup” R. Cocco, S.B. Reddy Karri, Y. Arrington, R. Hays, and T.M. Knowlton, Presented at AIChE Annual Meeting, Philadelphia, PA, November 17, 2008.
  • “Emulsion Phase Density in Deep Fluidized Beds of Geldart Group A Materials” A. Issangya, S.B. Reddy Karri, and T.M. Knowlton, Presented at AIChE Annual Meeting, Philadelphia, PA, November 17, 2008.
  • “Effect of Baffles on Gas Bypassing in a 0.9-Meter-Diameter Unit” A. Issangya, S.B. Reddy Karri, and T.M. Knowlton, Presented at AIChE Annual Meeting, Philadelphia, PA, November 17, 2008.
  • “CFD of Gas Bypassing in Fluidized Beds with Imposed Solids Flux” R. Cocco, A. Issangya, S.B. Reddy Karri, and T.M. Knowlton, Presented at AIChE Annual Meeting, Philadelphia, PA, November 20, 2008.
  • "Particle Clusters and Fluidized Beds” R. Cocco, F. Shaffer, S.B. Reddy Karri, R. Hays, and T.M. Knowlton, Presented at AIChE Annual Meeting, Nashville, TN, November 11, 2009.
  • "Effect Of Pressure on Gas Bypassing In Deep Fluidized Beds of Group A Material” A. Issangya,, S.B. Reddy Karri, and T.M. Knowlton, Presented at AIChE Annual Meeting, Nashville, TN, November 11, 2009.
  • "What is Happening Above Your Fluidized Bed?  Tools to Maximize FCC Unit Reliability and Turnaround Cycles” J. Sexton,, S.B. Reddy Karri, R. Cocco, A. Issangya, R. Hays, and T.M. Knowlton, Presented at NPRA Annual Meeting, Paper AM-10-108, Phoenix, AZ, March 23, 2010.
  • "Keeping FCC Units on Track: Winning the Operation Race with An Innovative Cyclone Technology” Y.M.. chen,, M. Nieskens, S.B. Reddy Karri, and T.M. Knowlton, Presented at NPRA Annual Meeting, Paper AM-10-108, Phoenix, AZ, March 24, 2010
  • "Jet Cup Attrition Testing” R. Cocco, Y. Arrington, R. Hays, J. Findlay, S.B. Reddy Karri, and T.M. Knowlton, Powder Technology, 200, pp. 224-233, March 7, 2010.
  • "Particle Clusters In and Above Fluidized Beds” R. Cocco, F. Shaffer, R. Hays, S.B. Reddy Karri, and T.M. Knowlton, Powder Technology, 203, pp. 3-11, July 17, 2010
  • "The Effect of Cohesive Forces on Catalyst Entrainment in Fluidized Bed Regenerators” R. Cocco, F. Shaffer, R. Hays, S.B. Reddy Karri, and T.M. Knowlton, in Advances in Fluid Catalytic Cracking:  Testing, Characterization and Environmental Regulations (Mario L. Occelli, ed.), Chemical Industries, 129 (2010), p. 155-171December 2, 2010.
  • “Understanding Standpipe Hydrodynamics Using Electrical Capacitance Tomography” C. Qui, R. Joachim, and S.B.R. Karri, Proceedings of Tenth International Circulating Fluidized Bed Conference (Ed. T.M. Knowlton), Sun River, Oregon, p. 824, , May 1, 2011.
  • “Erosion in Second Stage Cyclones:  Effects of Cyclone Length and Outlet Gas Velocity” S.B.R. Karri, R. Cocco, and T.M. Knowlton, Proceedings of Tenth International Circulating Fluidized Bed Conference (Ed. T.M. Knowlton), Sun River, Oregon, p. 377, , May 3, 2011.
  • “Effect of Gas Bypassing in Deep Beds on Cyclone Dipleg Operation” A. Issangya, S.B.R. Karri, T.M. Knowlton, and R. Cocco, Proceedings of Tenth International Circulating Fluidized Bed Conference (Ed. T.M. Knowlton), Sun River, Oregon, p. 409, , May 3, 2011.
  • "Impact of Material Property and Operating Conditions on Mass Flux Profiles of Monodisperse and Polydisperse Group B Particles in a CFB riser” J.W. Chew, R. Hays, J.G. Findlay, T.M. Knowlton, S.B.R. Karri, R. Cocco, and C.M. Hrenya, Powder Technology, 214, pp. 89-98, July 17, 2011.
  • "Cluster Characteristics of Geldart Group B Particles in a Pilot-Scale CFB Riser. I. Monodisperse Systems” J.W. Chew, R. Hays, J.G. Findlay, T.M. Knowlton, S.B.R. Karri, R. Cocco, and C.M. Hrenya, Chemical Engineering Science, 68, pp. 72-81, September 1, 2011.
  • "Cluster Characteristics of Geldart Group B Particles in a Pilot-Scale CFB Riser. II. Polydispersed System” J.W. Chew, R. Hays, J.G. Findlay, T.M. Knowlton, S.B.R. Karri, R. Cocco, and C.M. Hrenya, Chemical Engineering Science, 68, pp. 82-93, September 1, 2011.
  • "Species Segregation of Binary Mixtures and a Continuous Size Distribution of Group B Particles in Riser Flow” J.W. Chew, R. Hays, J.G. Findlay, T.M. Knowlton, S.B.R. Karri, R. Cocco, and C.M. Hrenya, Chemical Engineering Science, 66, pp. 4595-4604, November 30, 2011.
  • "Reverse Core-Annular Flow of Geldart Group B Particles in Risers” J.W. Chew, R. Hays, J.G. Findlay, T.M. Knowlton, S.B.R. Karri, R. Cocco, and C.M. Hrenya, Chemical Powder Technology, 221, pp. 1-12, March 22, 2012.
  • “Particle and particle cluster hydrodynamics in a circulating fluidized bed riser,” R. Cocco, S. B. R. Karri, T. Knowlton, B. Gopalan, F. Shaffer, J. W. Chew, and C. M. Hrenya, presented at the Fluidized Bed Combustion XXI, Napoli, Italy, vol. 21, pp. 1–8, 2012.
  • “Particle Cluster Dynamics During Fluidization,” Jennifer McMillan, Frank Shaffer, Balaji Gopalan, Jia Wei Chew, Christine Hrenya, Roy Hays, S.B. Reddy Karri, Ray Cocco,, Chemical Engineering Science, vol. 100, pp. 39-52, 2013.
  • “High Speed Imaging of Particle Flow Fields in CFB Risers, F. Shaffer, Gopalan, B., Breault R.W., Cocco, R., Karri, S.B.R., Hays, R., Knowlton, T., Powder Technology, vol. 75, pp. 1-14, 2013.
  • "Use of Acoustic Probes in the Detection of Second Stage Cyclone Dipleg Flooding",  R. C. Hays and S.B. Reddy Karri, PSRI Report, RB-199, 2013.
  • "Fluidized Bed Internals - Literature Review",  A. Issangya and  S.B. Reddy Karri,  PSRI State of the Art Report, SA-28, 2013.
  • “Liquid Injection into Fluidized Beds",  R. Cocco, J. McMillan, R. Hays, S.B. Reddy Karri, Fluidization XIV, The Netherlands, pp. 79-85, May  2013.
  • “Effect of Bed Diameter, Baffles, Fines Content and Operating Conditions on Pressure Fluctuations in Fluidized Beds",  A. Issangya, S.B. Reddy Karri, T.M. Knowlton, R. Cocco Fluidization XIV, The Netherlands, pp. 477-484, May  2013.
  • "Computational Fluid Dynamics of a Disk and Donut Stripper",  R. Cocco, A. Issangya, T.M. Knowlton, S.B. Reddy Karri,CFB-11, Beijing, China, May  2014.
  • "An Acoustic Method for the Measurement of Minimum Fluidization and Bubbling Properties of Group A Solids",  A. Issangya, R. Hays, R. Cocco, T.M. Knowlton, S.B. Reddy Karri,CFB-11, Beijing, China, May  2014.
  • "Avoid Fluidization Pitfalls",  R. Cocco, S.B. Reddy Karri, T.M. Knowlton, Chemical Engineering Progress., December  2014.
  • “Review of Entrainment Correlations in Gas–Solid Fluidization,” Anatharaman, A, A; Issangya, S.B. Reddy Karri, J. Findlay, C.M. Hrenya, J-W.Chew, Chemical Engineering Journal, vol. 260, no. C, pp. 152–171, January 2015.
  • “Investigation of Particle Velocity in FCC Gas-fluidized Beds Based on Different Measurement Techniques,” S. Tebianian, K. Dubrawski, N. Ellis, R.A. Cocco, R. Hays, S.B. Reddy Karri, T.W. Leadbeater, D.J. Parker, J. Chaouki, R. Jafari, P.G. Trinanes, J.P.K. Seville, J.R. Grace, Chemical Engineering Science, vol. 127, pp. 310-322, 2015.
  • “Use of pressure to mitigate gas bypassing in fluidized beds of FCC catalyst particles,” A. Issangya, S.B. Reddy Karri, T.M. Knowlton, R. Cocco, Powder Technology, vol. 290, pp. 53–61, 2016.
  • “Small-scale particle interactions are having significant effects on global fluidized bed behavior,” R. Cocco, A. Issangya, S.B. Reddy Karri, T. Freeman, H.M. Jaeger, T.M. Knowlton, KONA Powder and Particle Journal, vol. 34,  pp. 155-165, 2017.
  • “Annulus flow Behavior of Geldart Group B Particles in a Pilot-Scale CFB Riser,” Chew, J-W, Cahyadi, A., Hrenya, C.M., Karri, S.B.R., Cocco, R.A, Powder Technology, vol. 305,  pp. 816-828, 2017.
  • “Cyclone Systems in Circulating Fluidized Beds,” T.M. Knowlton, S.B. Reddy Karri, CFB XII, Krakow, Poland,  pp. 47-64, 2017.
  • “Particle Attrition: Mechanisms and Methods to Determine Attrition Indices,” Y. Arrington, S.B. Reddy Karri, R. Cocco, CFB XII, Krakow, Poland,  pp. 673-677, 2017.
  • “Hydrodynamics of High Velocity Circulating Fluidized Bed Risers of FCC Catalyst Particles,” A. Issangya, S.B. Reddy Karri, R. Cocco, T.M. Knowlton, CFB XII, Krakow, Poland,  pp. 247-255, 2017.
  • “Annulus flow Behavior of Geldart Group B Particles in a Pilot-Scale CFB Riser,” A. Anatharaman, A; Issangya, S.B. Reddy Karri, J. Findlay, C.M. Hrenya, R.A. Cocco, J-W.Chew, CFB XII, Krakow, Poland,  pp. 629-635, 2017.
  • “Dynamic Force Sensors and Their Applications in Fluidized Beds,” S. Sundaram, A. Issangya, S.B. Reddy Karri, R. Cocco, T.M. Knowlton CFB XII, Krakow, Poland,  pp. 647-654, 2017.
  • “Annulus flow Behavior of Geldart Group B Particles in a Pilot-Scale CFB Riser,” Chew, J-W, Cahyadi, A., Hrenya, C.M., Karri, S.B.R., Cocco, R.A, Powder Technology, vol. 305,  pp. 816-828, 2017.

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