TY - JOUR
T1 - Life cycle assessment of CO 2 sequestration in magnesium silicate rock - A comparative study
AU - Nduagu, Experience
AU - Bergerson, Joule
AU - Zevenhoven, Ron
N1 - Funding Information:
E. Nduagu acknowledges the support and contributions from Professor David W. Keith and his Energy and Environment Systems Group, Institute for Sustainable Energy Environment and Economy at the University of Calgary, Alberta, Canada. Support from Academy of Finland program “Sustainable Energy” (2008–2011) and Åbo Akademi University’s Graduate School for Chemical Engineering (GSCE) is also acknowledged. Appendix A
Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2012/3
Y1 - 2012/3
N2 - This paper addresses the energy and environmental implications of sequestrating CO 2 from a coal power plant using magnesium silicate rock. An accounting type life cycle assessment (LCA) of the mineralization method under development at bo Akademi University (AU), Finland, is presented and the results are compared with the process developed at the National Energy Technology Laboratory (NETL), formerly Albany Research Council (ARC) in the US. The AU process is a multi-staged route where CO 2 is sequestered via a process that first produces magnesium hydroxide, Mg(OH) 2 from Mg silicate. The Mg(OH) 2 produced is later reacted with CO 2 in a high temperature gas/solid pressurized fluidized bed (FB) reactor, forming pure, stable and environmentally benign MgCO 3 product. This study addresses the following important issues; (a) the material and energy requirements of sequestering 1 ton of CO 2 (t-CO 2) in mineral silicate, (b) the overall environmental burdens associated with CO 2 sequestration using serpentinite mineral, (c) the priorities and opportunities for reduction of energy requirements and environmental impacts associated with mineralizing CO 2, and (d) comparison of LCA results of the AU mineralization process route with that of the mineralization process developed by NETL. Exergy calculations show that with heat recovery mineralizing 1 t-CO 2 using the AU process requires 3.6 GJ/t-CO 2 while that of the NETL needs 3.4 GJ/t-CO 2. Applying results of exergy analysis in the life cycle inventory (LCI) models of the AU and the NETL processes leads to 517 kg CO 2e and 683 kg CO 2e of greenhouse gas emissions (in CO 2 equivalents) respectively, for every ton of CO 2 mineralized in serpentinite.
AB - This paper addresses the energy and environmental implications of sequestrating CO 2 from a coal power plant using magnesium silicate rock. An accounting type life cycle assessment (LCA) of the mineralization method under development at bo Akademi University (AU), Finland, is presented and the results are compared with the process developed at the National Energy Technology Laboratory (NETL), formerly Albany Research Council (ARC) in the US. The AU process is a multi-staged route where CO 2 is sequestered via a process that first produces magnesium hydroxide, Mg(OH) 2 from Mg silicate. The Mg(OH) 2 produced is later reacted with CO 2 in a high temperature gas/solid pressurized fluidized bed (FB) reactor, forming pure, stable and environmentally benign MgCO 3 product. This study addresses the following important issues; (a) the material and energy requirements of sequestering 1 ton of CO 2 (t-CO 2) in mineral silicate, (b) the overall environmental burdens associated with CO 2 sequestration using serpentinite mineral, (c) the priorities and opportunities for reduction of energy requirements and environmental impacts associated with mineralizing CO 2, and (d) comparison of LCA results of the AU mineralization process route with that of the mineralization process developed by NETL. Exergy calculations show that with heat recovery mineralizing 1 t-CO 2 using the AU process requires 3.6 GJ/t-CO 2 while that of the NETL needs 3.4 GJ/t-CO 2. Applying results of exergy analysis in the life cycle inventory (LCI) models of the AU and the NETL processes leads to 517 kg CO 2e and 683 kg CO 2e of greenhouse gas emissions (in CO 2 equivalents) respectively, for every ton of CO 2 mineralized in serpentinite.
KW - CO mineralization
KW - Exergy analysis
KW - Life cycle assessment
KW - Magnesium hydroxide
KW - Magnesium silicate
UR - http://www.scopus.com/inward/record.url?scp=83455176186&partnerID=8YFLogxK
U2 - 10.1016/j.enconman.2011.10.026
DO - 10.1016/j.enconman.2011.10.026
M3 - Article
AN - SCOPUS:83455176186
SN - 0196-8904
VL - 55
SP - 116
EP - 126
JO - Energy Conversion and Management
JF - Energy Conversion and Management
ER -