Adsorption technology for direct recovery of compressed, pure CO 2 from a flue gas without pre-compression or pre-drying
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Adsorption technology for direct recovery of compressed, pure CO2 from a flue gas without pre-compression or pre-drying Michael G. Beaver · Shivaji Sircar
Received: 2 October 2009 / Accepted: 23 May 2010 / Published online: 10 June 2010 © Springer Science+Business Media, LLC 2010
Abstract The effects of the sorption and the regeneration temperatures on the performance of a novel rapid thermal swing chemisorption (RTSC) process (Lee and Sircar in AIChE J. 54:2293–2302, 2008) for removal and recovery of CO2 from an industrial flue gas without pre-compression, pre-drying, or pre-cooling of the gas were mathematically simulated. The process directly produced a nearly pure, compressed CO2 by-product stream which will facilitate its subsequent sequestration. Na2 O promoted alumina was used as the CO2 selective chemisorbent, and the preferred temperatures were found to be, respectively, 150 and 450 °C for the sorption and regeneration steps of the process. The specific cyclic CO2 production capacity of the process and the pressure of the by-product CO2 gas were substantially increased over those previously achieved by using the sorption and regeneration temperature of, respectively, 200 and 500 °C (Lee and Sircar in AIChE J. 54:2293–2302, 2008). The net compressed CO2 recovery from the flue gas (∼92%) did not change. However, substantially different amounts of high and low pressure steam purges were necessary for comparable degree of desorption of CO2 . A first pass estimation of the capital and the operating costs of the RTSC process was carried out for a relatively moderate size application (flue gas clean up and CO2 recovery from a ∼ 80 MW coal fired power plant). Both costs were substantially lower than those for a conventional absorption process using MEA as the CO2 solvent (Desideri and Paolucci in Energy Convers. Manag. 40:1899–1915, 1999).
M.G. Beaver · S. Sircar () Dept. of Chemical Engineering, Lehigh University, Bethlehem, PA 18015, USA e-mail: [email protected]
Keywords Thermal swing chemisorption · Flue gas · Carbon dioxide removal and recovery · Promoted alumina · Comparative cost
1 Introduction Emission of carbon dioxide, the primary green house gas, to the atmosphere via industrial flue gases has become a major universal concern due to the potential global warming problems. Consequently, development of efficient and cost-effective means for post-combustion removal and recovery of CO2 from a flue gas for possible sequestration is a major topic of current research and development in the field of chemical engineering. Three different generic separation technologies have been extensively evaluated for this application. They are (a) physical or chemical absorption of CO2 by a liquid solvent, (b) physical adsorption of CO2 by a micro-porous solid adsorbent, and (c) selective permeation of CO2 through a porous or a non-porous membrane. The key features of these technologies have been highlighted and a list of major references on the topic is provided in a recent publication by Lee and Sircar (2008). Many of thes
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