The thermal characteristics of pulverized coal have been studied under oxy-fuel combustion conditions using non-isothermal thermogravimetric analysis (TG). The atmospheres used were 21%O2/79%N2, 21%O2/79%CO2, 30%O2/70%O2, and 35%O2/65%CO2. Coal blends of coal with 10 and 20% of biomass were also studied under these atmospheres. The addition of 10 and 20% of steam was evaluated for the oxy-fuel combustion atmospheres with 21 and 30% of O2 in order to study the effect of the wet recirculation of flue gas. The results obtained were similar for all the different rank coals and indicated that replacing N2 by CO2 in the combustion atmosphere with 21% of O2 caused a slight decrease in the rate of mass loss and delayed the burning process of the coal, biomass and coal/biomass blend samples. When the O2 concentration was increased to 30 and 35% in the oxy-fuel combustion atmosphere, the rate of mass loss increased, the burning process occurred at lower temperatures and it was shorter in duration. An increase in the rate of mass loss and a reduction in burning time and temperature were observed after the addition of steam to the oxy-fuel combustion atmosphere. No relevant differences between the 10 and 20% steam concentrations were observed.
1. BP 2009. BP statistical review of world energy June 2009. http://www.bp.com. Accessed 22 Nov 2010.
2. Buhre, BJP, Elliott, LK, Sheng, CD, Gupta, RP, Wall, TF2005Oxy-fuel combustion technology for coal-fired power generation. Prog Energy Combust Sci31:283–307.
Rathnam, RK, Elliott, LK, Wall, TF, Liu, Y, Moghtaderi, B2009Differences in reactivity of pulverised coal in air (O2/N2) and oxy-fuel (O2/CO2) conditions. Fuel Process Technol90:797–80210.1016/j.fuproc.2009.02.009.)| false
Li, Q, Zhao, C, Chen, X, Wu, W, Li, Y2009Comparison of pulverized coal combustion in air and in O2/CO2 mixtures by thermo-gravimetric analysis. J Anal Appl Pyrolysis85:521–52810.1016/j.jaap.2008.10.018.)| false
Molina, A, Shaddix, CR2007Ignition and devolatilization of pulverized bituminous coal particles during oxygen/carbon dioxide coal combustion. Proc Combust Inst31:1905–191210.1016/j.proci.2006.08.102.)| false
Li, X, Rathnam, RK, Yu, J, Wang, Q, Wall, T, Meesri, C2010Pyrolysis and combustion characteristics of an Indonesian Low-Rank Coal under O2/N2 and O2/CO2 conditions. Energy Fuels24:160–16410.1021/ef900533d.)| false
Pis, JJGde la PuenteFuente, E, Morán, A, Rubiera, F1996A study of the self-heating of fresh and oxidized coals by differential thermal analysis. Thermochim Acta279:93–10110.1016/S0040-6031(96)90066-0.)| false
Slovák, V, Taraba, B2010Effect of experimental conditions on parameters derived from TG-DSC measurements of low-temperature oxidation of coal. J Therm Anal Calorim101:641–64610.1007/s10973-010-0878-6.)| false
Rubiera, F, Arenillas, A, Fuente, E, Miles, N, Pis, JJ1999Effect of the grinding behaviour of coal blends on coal utilisation for combustion. Powder Technol105:351–35610.1016/S0032-5910(99)00158-8.)| false
Khare, SP, Wall, TF, Farida, AZ, Liu, Y, Moghtaderi, B, Gupta, RP2008Factors influencing the ignition of flames from air-fired swirl pf burners retroffited to oxy-fuel. Fuel87:1042–104910.1016/j.fuel.2007.06.026.)| false