Limestone Calcination with CO2 Capture (III): Characteristics of Coal Combustion during Limestone Decomposition
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- 作者：Yin Wang ; Shiying Lin ; Yoshizo Suzuki
- 刊名：Energy & Fuels
- 出版年：2009
- 出版时间：May 21, 2009
- 年：2009
- 卷：23
- 期：5
- 页码：2804-2809
- 全文大小：377K
- 年卷期：v.23,no.5(May 21, 2009)
- ISSN：1520-5029
文摘
In this study, the combustion characteristics of coal in CO2/O2 and steam/CO2/O2 atmospheres were investigated during limestone decomposition in a continuously operating fluidized bed reactor for CO2 capture. The results show that the variations and concentrations of CO, CH4, and H2 in the exhaust gas of the reactor in the steam/CO2/O2 atmosphere were smaller than those in the CO2/O2 atmosphere. Because of steam dilution, the CO2 concentration in the bed was lower in the steam/CO2/O2 atmosphere than that in the CO2/O2 atmosphere, and the effect of differential pressure variation on limestone decomposition in the fluidized bed was less pronounced in the steam/CO2/O2 atmosphere than that in the CO2/O2 atmosphere. Additionally, N2O emission was detected only in the CO2/O2 atmosphere, and the conversion of N to NO in the steam dilution atmosphere was of a smaller magnitude than that observed in the CO2/O2 atmosphere. We also found that the conversion of S to SO2 in the steam/CO2/O2 atmosphere was lower than that observed in the CO2/O2 atmosphere. The contents of sulfur, SiO2, and Al2O3 were much higher in solid samples located in the cyclone than in the overflow holder in both steam/CO2/O2 and CO2/O2 atmospheres. Finally, the hydration and carbonation reactivities of CaO produced in the steam/CO2/O2 atmosphere were better than those produced in the CO2/O2 atmosphere.