1. Kinetics and Structural Characterization of Calcium-Based Sorbents Calcined under Subatmospheric Conditions for the High-Temperature CO2Capture Process.
- Author
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Bartev B. Sakadjian, Mahesh V. Iyer, Himanshu Gupta, and Liang-Shih Fan
- Subjects
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LIMESTONE , *CALCIUM carbonate , *LIME (Minerals) , *CARBON dioxide - Abstract
The influence of several process parameters on the calcination of a naturally occurring limestone and a precipitated mesoporous calcium carbonate (CaCO3) sorbent structure to calcium oxide (CaO) is detailed in this study. CaCO3calcination is an integral part of a multicyclic carbonation-calcination reaction (CCR) process that separates carbon dioxide (CO2) from high-temperature gas mixtures into a pure CO2stream. Maintenance of high sorbent reactivity over repeated CCR cycles reduces the capital and operating cost of the CCR process. A lower calcination temperature, required to maintain high sorbent reactivity, reduces the calcination rate of CaCO3. This study investigates various process conditions such as subatmospheric calcination, sorbent dispersion in a rotary calciner, use of a high thermal conductivity sweep gas, etc. in enhancing the calcination rate at lower calcination temperatures. The high-temperature gas-solid carbonation studies of the resulting CaO sorbent prove the necessity to maintain a high porosity structure during limestone calcination. [ABSTRACT FROM AUTHOR]
- Published
- 2007
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