Journal
CHEMICAL ENGINEERING & TECHNOLOGY
Volume 35, Issue 3, Pages 489-496Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ceat.201100462
Keywords
Cascaded membrane process; CO2; N2 membrane; Dewatering; Post-combustion; Pressure loss
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CO2 fugacity difference is the driving force for CO2-selective membranes used in post-combustion capture. The ambient pressure of the flue gas makes it very difficult to use only a single membrane stage to achieve the CO2 purity required by pipeline transport and storage, e.g., 95?mol.-%. On the basis of a general multi-stage membrane concept, an energy-efficient membrane cascade is developed. The correlation of energy consumption and membrane area of a cascaded membrane process is investigated, considering 50?%, 70?%, and 90?% degree of CO2 separation. In addition to an idealized flue gas consisting of N2 and CO2 only, also a quasi-real flue gas is studied. Pressure loss in membrane modules and their influence on process energy consumption are discussed.
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