Fig. 3: Double-stage process for NGCC and NGCC-EGR.
From: Energy- and cost-efficient CO2 capture from dilute emissions by pyridinic-graphene membranes
a, Specific energy as a function of Pfeed,1 with Pperm,1 of 0.05 bar and 0.1 bar. b, Evolution of capital costs from EPC to TPCFOAK and TPCNOAK with variable number of installed plants for a selected pressure configuration: Pfeed,1 = 2 bar, Pperm,1 = 0.05 bar. c,d, CAPEX (c) and OPEX (d) with fixed Pperm,1 = 0.05 bar and variable Pfeed,1. e, Cost confidence intervals in function of Pfeed,1 (continuous line, mean with uncertain electricity cost; dotted lines, mean with fixed electricity costs of US$0.061 per kilowatt-hour, 0.081 per kilowatt-hour and 0.110 US$ per kilowatt-hour). Fixed operating conditions: Pperm,1 = 0.05 bar, Pfeed,2 = 1 bar, Pperm,2 = 0.1 bar, recovery = 90%, purity = 95%. Sampling method: quasirandom Sobol sampling with size n = 6000. Error bars in b–d indicate the mean ± range (min–max). Cost intervals in e between 5th and 95th percentiles.
