Hydrodynamics of the Pilot Scale Wet Scrubber with Restricted Outlet Absorbent Flow Rate

DOI: 10.4236/eng.2012.47044   PDF   HTML     6,177 Downloads   9,204 Views   Citations


This paper presents the hydrodynamics of the wet scrubber coupled to a pilot CFB incineration facility. The scrubber was operated using tap water as a scrubbing liquid. The outlet liquid flow rate, Qo, and accumulation rate, Qa, strongly depend on the inlet liquid flow rate, Qin, with different profiles. At higher Qin values, Qo stabilizes, leading to higher Qa and finally flooding. The values of Qa were higher than Qo except for Qin ranging between 0.53 and 0.72 L/s (safe operating range) in which Qa ≌ Qo and Qa = Qin/2. The outlet-to-inlet liquid flow rate ratio, Qo/Qin decreased for Qin > 0.53 L/s. The increase in the accumulation-to-inlet liquid flow rate ratio, Qa/Qin, at higher Qin indicates a change in flow regime towards flooding, accompanied by an abrupt increase in the height of accumulating liquid, Ha. The difference between Qa/Qin and Qo/Qin (denoted as, ΔQao/Qin), shows a minimum close to zero in the safe operating range. The gas flow rate towards the wet scrubber had slight effect on Qo and Qa when Qin was maintained constant. The ratio Qo/Qin decreased slightly with Ha/Ht irrespective of gas velocity. Changing the liquid-to-gas ratio, L/G and Qin strongly affects the maximum and minimum values of Qo/Qin and Qa/Qin.

Share and Cite:

S. Manyele, "Hydrodynamics of the Pilot Scale Wet Scrubber with Restricted Outlet Absorbent Flow Rate," Engineering, Vol. 4 No. 7, 2012, pp. 339-348. doi: 10.4236/eng.2012.47044.

Conflicts of Interest

The authors declare no conflicts of interest.


[1] C. D. Cooper and F. C. Alley, “Air Pollution Control: A Design Approach,” Prospect Heights, III, Wavelans Press, 1986.
[2] W. R. Carson, W. C. Nobles, M. H. Anderson and T. J. Boyd, “Electrostatic Precipitation Test Program at TVA’s 20 MW FBC Pilot Plant,” Proceedings of the 9th International Conference on CFB Combustion, 1987.
[3] E. P. Columbus, “Series Cyclone Arrangements to Reduce Gin Emissions,” Transactions of ASAE, Vol. 36, No. 2, 1993, pp. 545-550.
[4] J. D. McKenna and J. H. Turner, “Fabric Filter-Bag- houses I, Theory, Design, and Selection, Roanoke,” ETS, VA, 1989.
[5] S. A. Fraser, S. Maartmann, E. Pollock and V. Razbin, “Evaluation of Electrostatic Precipitators versus Baghouses for a 150 MWe Utility CFB Boiler,” Proceedings of the 10th International Conference on CFB Combustion, 1989.
[6] G. P. Greiner, “Fabric Filter-Baghouses II—Operation, Maintenance, and Trouble Shooting (A User’s Manual),” Valley Printers, Salem, 1993.
[7] Y. Chang and M. Chen, “Industrial Waste to Energy by CFB Combustion,” Resources, Conservation and Recycling, Vol. 9, 1993, pp. 281-294.
[8] S. Calvert, “Engineering Design of Fine Particle Scrubbers,” Journal of the Air Pollution Control Association, Vol. 24, No. 10, 1974, pp. 929-934. doi:10.1080/00022470.1974.10469990
[9] S. Calvert, “Particle Control by Scrubbing,” In: S. Calvert and H. M. Englund, Eds., Handbook of Air Pollution Technology, Willey, New York, 1984.
[10] S. Calvert, “Scrubbing,” In: A. C. Stern, Ed., Air Pollution, Vol. IV, Academic Press, New York, 1977.
[11] S. Calvert, J. Goldschmid, D. Leith and D. Mehat, “Wet Scubber System Study,” In: Scrubber Handbook, Vol. 1, US Department of Commerce, NTIS, PB-213016, 1972.
[12] M. M. Said and S. V. Manyele, “Hydrodynamics of the Multistage Wet Scrubber Coupled to a CFB Incinerator,” African Journal of Environmental Science and Technology (AJEST), 2010.
[13] A. J. Bourncore and W. T. Davis, “Air Pollution Engineering Manual,” Van Nostrand Reinhold, New York, 1992.

comments powered by Disqus

Copyright © 2020 by authors and Scientific Research Publishing Inc.

Creative Commons License

This work and the related PDF file are licensed under a Creative Commons Attribution 4.0 International License.