Mandeep asme ectc_2011
- 1. 1 An Experimental Study of Small-Sized Conical Spouted Beds (CSBs) 11th ASME Early Career Technical Conference Georgia Institute of Technology, November 4-5, 2011 Mandeep Sharma, Matthew Lousteau, Dr. Ingmar Schoegl Department of Mechanical Engineering Louisiana State University
- 2. 2 Background Mathur and Gishler introduced Spouted Bed Reactors at NRC Canada in 1954 • Alternative for drying moist wheat grains (peas, lentils and flax) • Combustion of solid and heavy liquid fuels • Potential for gasification and pyrolysis of wastes: Biomass (rice husk, pine or hard wood saw dust etc.) Plastics Tires
- 3. 3 Objective Major goal: develop a laboratory scale CSB gasifier facility for generating H2 from biomass Reactor design depends on hydrodynamic parameters Minimum Spouting Velocity Pressure drop across the bed Results from the Cold Flow CSB reactor model provides foundation for hot flow CSB reactor
- 4. 4 Conical Spouting Bed Contacting of solids with fluid by injecting a steady axial jet of fluid Spouting behavior Schematic of CSB reactor model
- 5. 5 Unique Characteristics of CSBs • Suitable for treatment of coarse, sticky, moist and irregular shaped material • Short residence time • Better heat and mass transfer inside the reactor • Economical
- 6. 6 Minimum Spouting Velocity (ums)o - minimum superficial fluid velocity at which inert particles bed remains in the spouted state Two ways to find it Experimental Theoretical
- 7. 7 Experiment
- 8. 8 Cold Flow CSB model • Fluidizing medium: Air • Bed material: Aluminum oxide particles (dp = 483 µm and 1092 µm, ρ = 3960 Kg/m3) • Column: ID of 63.5 mm • Fluid inlet diameters: 6.35 mm, 4.572 mm and 3.302 mm • The stagnated bed height: 10 mm to 50 mm- 60° conical contactor
- 9. 9 CSB Cold Flow Setup Air Schematic of experimental set-up: (1) air manifold, (2) air filter (3), control valve, (4/5) rotameters, (6) air inlet pipe, (7/8) pressure taps at bed inlet and outlet, (9) U-tube manometer, (10) conical contactor, (11) bed material, and (12) cylindrical column.
- 11. 11 Effect of system parameters on (ums)o Effect of different Ho, Do and dp on (ums)o
- 13. 13 Existing Correlations for (ums)o Source Correlation Eqn. Markowski (1) (1983) Choi (1992) (2) Gorshtein (3) (1964) Mukhlenov (4) (1965) Tsvik (1967) (5) Olazar (1992) (6) Olazar (1996) (7) Bi (1997) (for (8) Db/Do ≥1.66) They used significantly larger CSBs than the model investigated in present study
- 14. 14 Summary of operating parameters used previously and in the present study Source Particle D0 Dc Di ϒ Ho (mm) size (mm) (mm) (mm) (mm) (deg) Markowski et 3.41 ~ 300 ~ 5.6 ~ 3.36 ~ 5.6 ~ 300 37 al. (1983) 10.35 1100 300 690 Choi et al. 2.1 ~ 2.8 240 ~ 240 ~ 21 ~ 35 38 60 (1992) 450 400 Olazar et al. 0.95 ~ 25 28 ~ 70 ~ 30 ~ 60 360 60 (1992) 45 300 Bi H. T. et al. 1.16 12.7 ~ 65 ~ 30 ~ 80 ~ 38.1 (1997) 25.4 95.8 60 335 Present Study 0.483, 3.3 ~ 63.5 ~ 3.3~ 30, 60 10 ~ 65 (2011) 1.092 9.525 70 9.52 Evaluation of accuracy and applicability of existing correlations for ums required small sized CSBs
- 15. 15 Evaluation of Correlations …cont’d Correlations’ predictions comparison with experimental results for a particular set of operating parameters
- 16. 16 Evaluation of Correlations …cont’d For one particular data set - e.g. 60°, 483 µm, 6.35 mm Do best performing correlations align with the diagonal line
- 17. 17 Evaluation of Correlations …cont’d Comparison of Gorshtein correlation for all data sets
- 18. 18 Evaluation of Correlations …cont’d Comparison of Mukhlenov correlation for all data sets
- 19. 19 Evaluation of Correlations …cont’d Comparison of Tsvik correlation for all data sets
- 20. 20 Evaluation of Correlations …cont’d Comparison of Choi correlation for all data sets
- 21. 21 Poor performance of correlations:
- 23. 23 Proposed correlation shows excellent agreement with experiments 75 o Present Study, 60 cone angle 70 + 16.3 % 0.483 mm dp, 6.350 mm Do 65 0.483 mm dp, 4.572 mm Do 60 0.483 mm dp, 3.302 mm Do 55 1.092 mm dp, 6.350 mm Do Predicted (ums)o, m/s 50 1.092 mm dp, 4.572 mm Do - 17.15 % 45 1.092 mm dp, 3.302 mm Do 40 35 30 25 20 15 10 5 0 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 Experimental (ums)o, m/s
- 24. 24 Conclusions • Available Correlations have shortcomings for small-sized laboratory scale CSB studies • Developed Simple empirical correlation for (ums)o Showed excellent agreement with experimental findings • Results provide platform for design and fabrication of hot flow facility
- 25. 25 Work in Progress… • Additional tests required for the development of a universally applicable correlation for ums predictions for small-sized laboratory scale CSBs. • Data acquisition system installation • design and development of a laboratory scale CSB biomass gasifier for H2 generation
- 26. 26 Questions?
- 27. 27 Thank You! Acknowledgement: Louisiana State University Council on Research Faculty Research Grant Program
- 28. 28 Backup Slides
- 29. 29 Pressure Drop Measurements Effects of Ho and Do on stable pressure drops and maximum pressure drops