This paper focuses on assessment of the effect of flue gas recirculation (FGR) on heat transfer behavior in 1296t/h supercritical coal-fired circulating fluidized bed (CFB) combustor. The performance test in supercritical CFB combustor with capacity 966 MWth was performed with the low level of flue gas recirculation rate 6.9% into furnace chamber, for 80% unit load at the bed pressure of 7.7 kPa and the ratio of secondary air to the primary air SA/PA = 0.33. Heat transfer behavior in a supercritical CFB furnace between the active heat transfer surfaces (membrane wall and superheater) and bed material has been analyzed for Geldart B particle with Sauter mean diameters of 0.219 and 0.246 mm. Bed material used in the heat transfer experiments had particle density of 2700 kg/m3. A mechanistic heat transfer model based on cluster renewal approach was used in this work. A heat transfer analysis of CFB combustion system with detailed consideration of bed-to-wall heat transfer coefficient distributions along furnace height is investigated. Heat transfer data for FGR test were compared with the data obtained for representative conditions without recycled flue gases back to the furnace through star-up burners.
 Koornneef J., Junginger M., Faaji A.: Development of fluidized bed combustion – An overview of trends, performance and cost. Prog. Energ. Combust. 33(2007), 19–55.
 Hotta A.: Foster Wheeler’s solutions for large scale CFB boiler technology: Features and operational performance of Łagisza 460MWe CFB boiler. In: Proc. 20th Int. Conf. on Fluidized Bed Combustion, 2010, 59–70.
 Oka S.N.: Fluidized bed combustion. Marcel Dekker Inc., New York 2004, 1–37.
 Reh L.: Development potentials and research needs in circulating fluidized bed combustion. China Particuology 1(2003), 5, 185–200.
 Tan Y., Croiset E., Douglas M.A., Thambimuthu K.V.: Combustion characteristic of coal in a mixture of oxygen and recycled flue gas. Fuel 85(2006), 507–512.
 Becher V., Bohn J.P., Goanta A., Spliethoff H.: A combustion concept for oxyfuel processes with low recirculation rate – Experimental validation. Combust. Flame 158(2011), 1542–1552.
 Li J., Zhang X., Yang W., Blasiak W.: Effects of flue gas recirculation on NOx and SOx emissions in a co-firing boiler. IJCCE 2(2013), 13–21.
 Blume M., Bohn J.P., Goanta A., Spielthoff H.: Reduction of the flue gas recirculation rate in oxycoal processes by means of non-stoichiometric burner operation. Energy 45(2012), 117–124.
 Błaszczuk A., Nowak W., Jagodzik Sz.: Effects of operating conditions on deNOx efficiency in supercritical circulating fluidized bed boiler. J. Power Technol. 93(2013), 1, 1–8.
 Basu P.: Circulating fluidized bed boilers, Design, Operation and Maintenance. Springer Cham Heidelberg, New York 2015.
 Khartchenko N.V., Khartchenko V.M.: Advanced energy systems, 2nd Edn., CRC Press, Taylorand Francis Group, Boca Raton 2014.
 Dobrzański J., Zieliński A., Pasternak J., Hernas A.: Doświadczenia z zastosowania nowych stali do wytwarzania elementów kotłów na parametry nadkrytyczne. Prace Instytutu Metalurgii Żelaza 1(2010), 51–60 (in Polish).
 Spielthoff H.: Power generation from solid fuels. Springer, Berlin Heidelberg 2010.
 Chinsuwan A., Dutta A.: An experimental investigation of the effect of longitudinal fin orientation on heat transfer in membrane water wall tubes in a circulating fluidized bed. Int. J. Heat Mass Tran. 52(2009), 1552–1560.
 Basu P., Cheng L.: An experimental and theoretical investigation into the heat transfer of a finned water wall tube in a circulating fluidized bed boiler. Int. J. Energ. Res. 24(2000), 291–308.
 Luan W., Bowen B.D., Lim C.J., Brereton C.M.H., Grace J.R.: Suspension-to membrane-wall heat transfer in a circulating fluidized bed combustor. Int. J. Heat Mass Tran. 43(2000), 1173–1185.
 Lockhart C., Zhu J., Brereton C.M.H., Lim C.J., Grace J.R.: Local heat transfer, solids concentration and erosion around membrane tubes in a cold model circulating fluidized bed. Int. J. Heat Mass Tran. 38(1995), 2403–2410.
 Nag P.K., Nawsher M., Basu P.: A mathematical model for the predicted of heat transfer from finned surfaces in a circulating fluidized bed. Int. J. Heat Mass Tran. 38(1995), 1675–1681.
 Wu R.L., Grace J.R., Lim C.J.: A model for heat transfer in circulating fluidized beds. Chem. Eng. Sci. 45(1990), 12, 3389–3398.
 Noymer P.D., Glicksman L.R.: Descent velocities of particle clusters at the wall of a circulating fluidized bed. Chem. Eng. Sci. 55(2000), 5283–5289.
 Dutta A., Basu P.: An improved cluster-renewal model for estimation of heat transfer coefficient on the water-walls of commercial circulating fluidized bed boilers. J. Heat Trans. 126(2004), 1040–1043.
 Blaszczuk A., Nowak W.: Heat transfer behavior inside a furnace chamber of large-scale supercritical CFB reactor. Int. J. Heat Mass Tran. 87(2015), 464–480.
 Blaszczuk A., Nowak W.: Bed-to-wall heat transfer coefficient in a supercritical CFB boiler at different bed particle size. Int J. Heat Mass Tran. 79(2014), 736–749.
 Basu P., Cheng L.: Heat transfer in a pressurized circulating fluidized bed. Int. J. Heat Mass Tran. 39(1996), 13, 2711–2722.
 Błaszczuk A., Nowak W., Jagodzik Sz.: The impact of bed particle size in heat transfer to membrane walls of supercritical CFB boiler. Arch. Thermodyn. 35(2014), 3, 207–223.
 Grace J.R.: Fluidized bed heat transfer, in: G. Hestroni (Ed.), Handbook of Multiphase Flow, McGraw-Hill, Hemisphere, Washington, DC, 1982, 9–70.
 Błaszczuk A., Nowak W., Jagodzik Sz.: Bed-to-wall heat transfer in a supercritical circulating fluidised bed boiler. Chem. Process Eng. 35(2014), 2, 191–204.
 Brewster M.Q.: Effective absorptivity and emissivity of particulate media with application to fluidized bed. Trans. ASME J. Heat Transfer 108(1986), 710–713.
 Origin 8 User Guide. OriginLab Corporation, 2007.
 Andersson B.A.: Effects of bed particle size on heat transfer in circulating fluidized bed boilers. Powder Technol. 87(1996), 239–248.
 Patil R.S., Pandey M., Mahanta P.: Parametric studies and effect of scale-up on wall-to-bed heat transfer characteristic of circulating fluidized bed risers. Exp. Therm. Fluid Sci. 35(2011), 485–494.
 Kolar A.K., Sundaresan R.: Heat transfer characteristic at an axial tube in a circulating fluidized bed riser. Int. J. Therm. Sci. 41(2002), 673–681.
 Ma Y., Zhu J.-X.: Heat transfer between gas–solids suspension and immersed surface in an upflow fluidized bed (riser). Chem. Eng. Sci. 55(2000), 981–989.
 Reddy B.V.: Fundamental heat transfer mechanism between bed-to membrane water-walls in circulating fluidized bed combustors. Int. J. Energy Res. 27(2003), 813–824.
 Basu P.: Combustion and gasification in fluidized beds. CRC Press Taylor and Francis Group, Boca Raton, 2006.