The fragmentation of coal particles during oxy-fuel combustion in a circulating fluidized bed

• Autorzy: Kosowska-Golachowska M. , Kłos K. , Musiał T.
• Języki publikacji: EN

Abstrakty

EN

The fragmentation of coal plays a significant role during combustion process in circulating fluidized-bed boilers because it accelerates combustion and influences the distribution of particle sizes in the bed. Fine char particles produced by comminution can be carried out and increase the heat loss due to incomplete carbon conversion. The main objective of this study was to determine the degree of primary and secondary fragmentation for coal particles during oxy-combustion in a circulating fluidized bed. The effects of coal type, particle size, bed temperature and oxygen concentration on the extend of primary and secondary fragmentation have been determined. Fragmentation tests were conducted in a 12-kW bench-scale oxy-CFB combustor. The experiments with one brown and two hard Polish coals were carried out in air (base case) and mixtures of O2/CO2 with oxygen concentrations in the range from 21% to 40%vol.

• Wydawca: Komitet Termodynamiki i Spalania PAN
• Czasopismo: Archivum Combustionis
• Rocznik: 2012
• Tom: Vol. 32 nr 3-4
• Strony: 131--139
• Opis fizyczny: Bibliogr. 11 poz., rys., tab.

Twórcy

autor

Kosowska-Golachowska M.

• Czestochowa University of Technology, Institute of Thermal Machinery Armii Krajowej 19c, 42-201 Czestochowa

autor

Kłos K.

• Czestochowa University of Technology, Institute of Thermal Machinery Armii Krajowej 19c, 42-201 Czestochowa

autor

Musiał T.

• Czestochowa University of Technology, Institute of Thermal Machinery Armii Krajowej 19c, 42-201 Czestochowa

Bibliografia

• 1. Zheng L.: Oxy-fuel combustion for power generation and carbon dioxide (CO2) capture (Edited by L. Zheng), Woodhead Publishing, 2011.
• 2. Toftegaard M.B., Brix J., Jensen P.A., Glarborg P., Jensen A.D.: Progress in Energy and Combustion Science 36, 2010, pp.581‒625.
• 3. Kosowska-Golachowska M., Luckos A.: An Experimental Investigation into the Fragmentation of Coal Particles on a Fluidized-Bed Combustor. Proc. of the 20th International Conference on Fluidized Bed Combustion, Beijing, Springer, 2010, pp.330-334.
• 4. Chirone, R., Massimilla, L.: The application of Weibull theory to primary fragmentation of coal during devolatilization. Powder Technology 57, 1989, pp.197-212.
• 5. Arena, U., Cammarota, A., Chirone, R.: Primary and secondary fragmentation of coals in a circulating bed combustor. Symp. (Int.) on Combustion 25 (1994), pp. 219‒226.
• 6. Chirone, R., Salatino, P., Massimilla, L.: Secondary fragmentation of char particles during combustion in a fluidized bed. Combustion and Flame 77 (1989), pp.79‒90.
• 7. Kosowska, M.: The thermal fragmentation of coal during combustion process. PhD Thesis. Czestochowa University of Technology, 2005.
• 8. Dacombe, P., Pourkashanian, M., Williams, A., Yap, L.: Combustion induced fragmentation behavior of isolated coal particles. Fuel 78, 1999, pp.1847-1857.
• 9. Zhang, H., Cen, K., Yan, J., Ni, M.: The fragmentation of coal particles during the coal combustion in a fluidized bed. Fuel 81, 2002, pp.1835-1840.
• 10. Kosowska-Golachowska, M., Luckos, A., Klos K., Musial, T.: Oxy-combustion of different coals in a circulating fluidized bed. Proceedings of the 10th International Conference on Circulating Fluidized Beds and Fluidization Technology – CFB-10, T.M. Knowlton (Editor), USA, 2011, pp.481‒88.
• 11. Kosowska-Golachowska M., Luckos A., Kłos K., Musiał T.: Analysis of coal fragmentation during oxycombustion in a circulating fluidized-bed. Proceedings of the 21st International Conference on Fluidized Bed Combustion, Italy, 2012, pp.611-618.