A new calculation method of efficiency for gypsum and wastewater hydrocyclones in FGD unit in a power plant

Abstract

This study was carried on hydrocyclones in the Wet Flue Gas Desulfurization (WFGD) system of a local thermal power plant. In WFGD systems, hydrocyclones are used for classification in terms of PSD of limestone, dewatering the gypsum slurry and recycling the wastewater. Seperation efficiencies of hydrocyclones (waste water and gypsum) in power plant were calculated referring to each hydrocyclones’ inlet size of D25. Results obtained with Malvern Mastersizer for the samples from each exits of hydroclones were taken into consideration. Separation efficiency for waste water hydrocyclone was calculated as 4.0 % while it was calculated 77.5 % for gypsum hydrocyclone.

Keywords

• Wastewater
• thermal power plant
• particle size distribution
• hydrocyclone

References

1. [1]. M. Bilen, S. Kizgut, I. Toroglu, “Waste Water Treatment with Hydrocyclones in Power Plants,” In: EWMS Eurasia Waste Management Symposium, Istanbul Turkey, 2016
2. [2]. R. K. Dwari, M. N. Biswas, B. C. Meikap, “Performance characteristics for particles of samd FCC and fly ash in a novel hydrocyclone,” Chemical Engineering Science, vol. 59, no. 3, pp.671-684, 2004
3. [3]. H. Jun, A. Lian-suo, W. Zhi-quan, “Study on Application and Operation Optimization of Hydrocyclone for Solid-liquid Separation in Power Plant,” In: Proceedings of the World Congress on Engineering and Computer Science Vol 1, WCECS 2009, San Francisco, USA, October 20-22, 2009
4. [4]. Y. Zhong, X. Gao, W. Huo, Z. Luo, M. Ni, K. K. Cen, “A model for performance optimization of wet flue gas desulfurization systems of power plants,” Fuel Processing Technology, vol. 89, no.11 pp.1025-1032, 2008
5. [5]. P. S. Nolan, K. E. Redinger, G. T. Amrhein, G. A. Kudlac, “Demonstration of additive use for enhanced mercury emissions control in wet FGD systems,” Fuel Process. Technol. vol.85, no.6-7, pp.587–600, 2004
6. [6]. H. G. Nygaard, S. Kiil, J. E. Johnsson, J. N. Jensen, J. Hansen, F. Fogh, K. D. Johansen, “Full-scale measurements of SO2 gas phase concentrations and slurry compositions in a wet flue gas desulphurisation spray absorber,” Fuel vol.83, no.9, pp.1151–1164, 2004
7. [7]. D. S. Jin, B. R. Deshwal, Y. S. Park, H. Y. Lee, “Simultaneous removal of SO2 and NO by wet scrubbing using aqueous chlorine dioxide solution,” J. Hazard. Mater. vol.135, no.1-3, pp.412–417, 2006
8. [8]. C. Y. Hsu, S. J. Wu, R. M. Wu, “Particle Separation and tracks in a hydrocyclone,” Tamkang Journal of Science and Engineering, vol.14, no.1, pp. 65-70, 2011