(377g) Extending the Concept of Parasitic Energy By Introducing Water Competition

Authors: 
Huck, J. M. - Presenter, University of California-Berkeley
Joos, L., University of California-Berkeley
Berger, A. H., Electric Power Research Institute
Bhown, A. S., Electric Power Research Institute
Reuter, K., Technische Universitaet, Muenchen
Smit, B., University of Amsterdam
Lin, L. C., The Ohio State University

A promising way to significantly reduce the CO2 emission of power plants is Carbon Capture and Sequestration (CCS). Separating and compressing CO2, however, impose a large additional energy load on power plants, which in turn is not available for electricity production. The concept of parasitic energy predicts and minimizes the additional energy load on a material-by-material basis and hence, is considered a potential means to evaluate materials for CCS. Besides CO2 and N2, water plays a crucial part in CCS, due to its high affinity to bind to the adsorption sites designated for CO2, which poses a special challenge to the separation process. 

On the basis of Grand Canonical Monte Carlo (GCMC) simulations we calculate and implement water isotherms of all-silica zeolites to ensure a more realistic prediction of parasitic energy. Several flue gas compositions are analyzed, including direct air capture, to illustrate the difference in parasitic energy requirement induced by the change in CO2 concentration.