"On the basis of our analysis of factors such as source of electricity, availability of low pressure steam, and geographic location, the net operating cost of capture is estimated to be $100/t CO2."
Doesn't this directly contradict the APS analysis, which gives numbers closer to $1000/t? (with no sequestration) Gregory Benford On Wed, Jul 25, 2012 at 3:31 AM, Andrew Lockley <[email protected]>wrote: > Analysis of Equilibrium-Based TSA Processes for Direct Capture of CO2 from > Air > > > http://pubs.acs.org/doi/abs/10.1021/ie300691c?prevSearch=air%2Bcapture&searchHistoryKey= > > DOI: 10.1021/ie300691c > > Abstract > Direct capture of CO2 from air is a concept that, if successfully > implemented, could lead to capture of CO2 from disperse sources. We > have developed process models to consider the viability of > adsorption-based air capture technologies. Our models focus on using > an amino-modified silica adsorbent, TRI-PE-MCM-41, and a structured > monolithic contactor unit. We have studied several different > temperature swing adsorption processes using the purity of CO2 and > annual product throughput as metrics for comparing process > performance. This analysis identifies some of the operational > parameters, adsorbent characteristics, and other factors that have a > significant effect on the performance of the process. Using the total > energy requirement of the process and available sources of energy, > such as low pressure steam and electricity, we carry out an economic > analysis to obtain a net operating cost for air capture of CO2. We > identify a process with a daily throughput of 1.1 t CO2 at 88.5% > purity using standard shipping container sized air capture units. The > total energy required (6745 MJ/t CO2) is dominated by the parasitic > losses—sensible heat requirements of the contactor (40%) and the > adsorbent (28%) and not by the mechanical energy associated with air > flow (5%). On the basis of our analysis of factors such as source of > electricity, availability of low pressure steam, and geographic > location, the net operating cost of capture is estimated to be $100/t > CO2. These cost estimates do not include capital expenses necessary to > construct or maintain the air capture units. Potential strategies for > further reducing the energy and monetary cost of these processes are > identified. Our analysis supports continued work to establish the > technological and economic feasibility of adsorption-based air > capture. > > -- > You received this message because you are subscribed to the Google Groups > "geoengineering" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/geoengineering?hl=en. > > -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/geoengineering?hl=en.
