An experimental and modeling study of the contribution of coal ash to SO2 capture in fluidized bed combustion
Апстракт
The process of sulfur self-retention (SSR) occurs as a result of the reactions between the mineral matter in coal ash and the SO2 evolved during coal combustion. Consequently, the emission of SO2 may be significantly reduced. The results of experimental investigations and modeling of SSR is presented in this work. The transformations of sulfur forms during devolatilization are taken into account via a correlation for the amount of sulfur that remains in the char, after devolatilization. A novel approach has been applied for modeling SSR during char combustion, closely related to the grain model used for SO2 retention by limestone as a sorbent. It is assumed that SSR is a result of the reaction between SO2 and CaO in the form of uniformly distributed micro-grains in char. An unreacted shrinking core model is adopted for the reactions between the CaO micro-grains and SO2. The comparison with the experimentally obtained values in a fluidized bed reactor and in a laboratory oven, using coa...ls of different rank (fixed carbon over volatile matter ratio, C-fix/VM = 0.75-7.40), content of sulfur forms (total 0.84-6.04%, organic 0.71-4.71%, pyritic 0-2.57%) and molar Ca/S ratio (0.34-3.17), has shown that the model can adequately predict the kinetics of the process, the levels of the obtained values of SSR efficiencies, as well as the influence of temperature, coal particle size and the surrounding conditions. (C) 2003 Elsevier B.V. All rights reserved.
Кључне речи:
coal combustion / sulfur retention by ash / modelingИзвор:
Chemical Engineering Journal, 2003, 96, 1-3, 157-169
DOI: 10.1016/j.cej.2003.08.021
ISSN: 1385-8947
WoS: 000186859200017
Scopus: 2-s2.0-0345330110
Колекције
Институција/група
VinčaTY - JOUR AU - Grubor, Borislav AU - Manovic, V AU - Oka, Simeon N. PY - 2003 UR - https://vinar.vin.bg.ac.rs/handle/123456789/2688 AB - The process of sulfur self-retention (SSR) occurs as a result of the reactions between the mineral matter in coal ash and the SO2 evolved during coal combustion. Consequently, the emission of SO2 may be significantly reduced. The results of experimental investigations and modeling of SSR is presented in this work. The transformations of sulfur forms during devolatilization are taken into account via a correlation for the amount of sulfur that remains in the char, after devolatilization. A novel approach has been applied for modeling SSR during char combustion, closely related to the grain model used for SO2 retention by limestone as a sorbent. It is assumed that SSR is a result of the reaction between SO2 and CaO in the form of uniformly distributed micro-grains in char. An unreacted shrinking core model is adopted for the reactions between the CaO micro-grains and SO2. The comparison with the experimentally obtained values in a fluidized bed reactor and in a laboratory oven, using coals of different rank (fixed carbon over volatile matter ratio, C-fix/VM = 0.75-7.40), content of sulfur forms (total 0.84-6.04%, organic 0.71-4.71%, pyritic 0-2.57%) and molar Ca/S ratio (0.34-3.17), has shown that the model can adequately predict the kinetics of the process, the levels of the obtained values of SSR efficiencies, as well as the influence of temperature, coal particle size and the surrounding conditions. (C) 2003 Elsevier B.V. All rights reserved. T2 - Chemical Engineering Journal T1 - An experimental and modeling study of the contribution of coal ash to SO2 capture in fluidized bed combustion VL - 96 IS - 1-3 SP - 157 EP - 169 DO - 10.1016/j.cej.2003.08.021 ER -
@article{ author = "Grubor, Borislav and Manovic, V and Oka, Simeon N.", year = "2003", abstract = "The process of sulfur self-retention (SSR) occurs as a result of the reactions between the mineral matter in coal ash and the SO2 evolved during coal combustion. Consequently, the emission of SO2 may be significantly reduced. The results of experimental investigations and modeling of SSR is presented in this work. The transformations of sulfur forms during devolatilization are taken into account via a correlation for the amount of sulfur that remains in the char, after devolatilization. A novel approach has been applied for modeling SSR during char combustion, closely related to the grain model used for SO2 retention by limestone as a sorbent. It is assumed that SSR is a result of the reaction between SO2 and CaO in the form of uniformly distributed micro-grains in char. An unreacted shrinking core model is adopted for the reactions between the CaO micro-grains and SO2. The comparison with the experimentally obtained values in a fluidized bed reactor and in a laboratory oven, using coals of different rank (fixed carbon over volatile matter ratio, C-fix/VM = 0.75-7.40), content of sulfur forms (total 0.84-6.04%, organic 0.71-4.71%, pyritic 0-2.57%) and molar Ca/S ratio (0.34-3.17), has shown that the model can adequately predict the kinetics of the process, the levels of the obtained values of SSR efficiencies, as well as the influence of temperature, coal particle size and the surrounding conditions. (C) 2003 Elsevier B.V. All rights reserved.", journal = "Chemical Engineering Journal", title = "An experimental and modeling study of the contribution of coal ash to SO2 capture in fluidized bed combustion", volume = "96", number = "1-3", pages = "157-169", doi = "10.1016/j.cej.2003.08.021" }
Grubor, B., Manovic, V.,& Oka, S. N.. (2003). An experimental and modeling study of the contribution of coal ash to SO2 capture in fluidized bed combustion. in Chemical Engineering Journal, 96(1-3), 157-169. https://doi.org/10.1016/j.cej.2003.08.021
Grubor B, Manovic V, Oka SN. An experimental and modeling study of the contribution of coal ash to SO2 capture in fluidized bed combustion. in Chemical Engineering Journal. 2003;96(1-3):157-169. doi:10.1016/j.cej.2003.08.021 .
Grubor, Borislav, Manovic, V, Oka, Simeon N., "An experimental and modeling study of the contribution of coal ash to SO2 capture in fluidized bed combustion" in Chemical Engineering Journal, 96, no. 1-3 (2003):157-169, https://doi.org/10.1016/j.cej.2003.08.021 . .