Energy analysis of CaCO3 calcination with CO2 capture
文献类型：会议论文
| 作者 | Lin, Shiying1; Kiga, Takashi1; Wang, Yin2; Nakayama, Katsuhiro3 |
| 出版日期 | 1905-07-03 |
| 关键词 | Fluidized beds - Fluidized bed combustion - Lime - Greenhouse gases - Limestone - Steam - Atmospheric temperature - Carbon dioxide - Calcite - Chemical analysis - Iterative methods - Oxygen - Calcium carbonate - Heating - Coal - Coal combustion - Decomposition - Gas emissions |
| 卷号 | 4 |
| DOI | 10.1016/j.egypro.2011.01.062 |
| 页码 | 356-361 |
| 英文摘要 | One method for reducing CO2, the green house gas emissions is to capture CO2 before it releases into the atmosphere and then sequestrate it. Active lime (main component, CaO) can be used to capture CO 2 in the exhaust gas or in the reactor from fossil fuels utilization effectively. That is calcium oxide (CaO) absorbs CO2 to yield calcium carbonate (CaCO3) (Eq.(1)), then the CaCO3 is thermally decomposed to CaO again and release nearly pure CO2 (Eq. (2)) for sequestration. To obtain a nearly pure CO2 stream from CaCO 3 decomposition, the heat for decomposing CaCO3 can be supplied by combusting fossil fuels, such as coal and natural gas, in a calciner with oxygen fuel combustion. The oxygen diluted by CO2 (CO 2 cycle) or H2O (steam cycle), in order to obtain near pure CO2 stream from CaCO3 decomposition. In our previous studie s4-6, it was clarified that calcinations of limestone (main component, CaCO3) in a fluidized bed calciner can be performed in CO2 cycle atmosphere when the bed temperature was raised above 1293 K, whereas with 60% steam cycle in atmosphere, limestone can be decomposed at comparatively lower temperature, such as 1173 K. The decomposition conversions of the limestone were about 95% and 98%, in CO2 cycle and in steam cycle atmospheres, respectively. Reducing the calcinations temperature of limestone was helpful to produce more than 30% active CaO as shown in previous study4-6. In this study, the energy of CaCO3 calcination process by H2O (steam) cycle was analyzed and compared with CaCO 3 calcination process by CO2 cycle. For process calculations, the mass and energy flows were calculated iteratively, based on the input and output balances, until err [(input-output)/input] was 2O (steam) cycle calcination had calcination energy more about 3.6% than CO2 cycle due to water evaporation latent heat loss, however, the calcination energy per active CaO was lowest for H2O (steam) cycle. 漏 2011 Published by Elsevier Ltd. |
| 项目编号 | ACKNOWLEDGMENT This work was carried out under the frameworks of the project of the high performance coal gasification project for the next generation. The authors give their great thanks to NEDO for their financial support. |
| 资助机构 | Elsevier Ltd |
| 学科主题 | Calcination |
| 源URL | [http://ir.ipe.ac.cn/handle/122111/59462]  |
| 作者单位 | 1.Research and Development Department, Japan Coal Energy Center, Japan 2.Institute of Process Engineering, Chinese Academy of Sciences, China 3.National Institute of Advanced Industrial Science and Technology, Japan |
| 推荐引用方式 GB/T 7714 | Lin, Shiying,Kiga, Takashi,Wang, Yin,et al. Energy analysis of CaCO3 calcination with CO2 capture[C]. 见:. |
入库方式： OAI收割
来源：过程工程研究所
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