Limestone Calcination with CO2 Capture (II): Decomposition in CO2/Steam and CO2/N2 Atmospheres
详细信息 查看全文
- 作者：Yin Wang ; Shiying Lin ; Yoshizo Suzuki
- 刊名：Energy & Fuels
- 出版年：2008
- 出版时间：July 2008
- 年：2008
- 卷：22
- 期：4
- 页码：2326 - 2331
- 全文大小：496K
- 年卷期：v.22,no.4(July 2008)
- ISSN：1520-5029
文摘
Decomposition of limestone particles (0.25−0.5 mm) in a steam dilution atmosphere (20−100% steam in CO2) was investigated by using a continuously operating fluidized bed reactor for CO2 capture. The decomposition conversion of limestone increased as the steam dilution percentage in the CO2 supply gas increased. At a bed temperature of 1193 K, the conversions were 72% without dilution (100% CO2) and 98% with 60% steam dilution. The decomposition conversions obtained with steam dilution and N2 dilution differed significantly, and this result is explained in terms of the difference between the heat transfer to particle in steam and N2 dilution atmosphere. The reactivities of the CaO produced from limestone decomposition with steam dilution and without dilution (100% CO2) were tested by means of hydration and carbonation reactions. In the hydration test, the time required for complete conversion [CaO → Ca(OH)2] of the CaO produced by steam dilution was approximately half that required for the CaO produced without dilution. In the carbonation test, carbonation conversion (CaO → CaCO3) of the CaO produced by steam dilution was approximately 70%, whereas the conversion was approximately 40% for the CaO produced without dilution.