PDF Publication Title:
Text from PDF Page: 077
4.4 Case Studies and Computational Results very high CO2 recovery is sought. The intermediate section of the curve is a preferable region to operate. 4.4.3 Case III: Cycle synthesis to minimize power consumption Although we achieved a high purity separation in the previous case, the power consumption was also quite high. Therefore, the objective of this case is to obtain an optimal configuration which yields a high-purity separation at minimal power requirements. To achieve this, few minute modifications are done to the NLP (4.2). While the lower bound on CO2 recovery is relaxed to 85%, the lower bounds on CO2 purity and feed flux are relaxed to 90% and 65 kgmol m−2hr−1, respectively. To minimize the work done in compressing flue gas from Pinlet to Pfeed (in Equation (3.15a)), we consider Pfeed a decision variable instead of fixing it to 300 kPa. Appropriate bounds are imposed on Pfeed. The efficiency is kept same as 72% for all compressors and vacuum generator. The rest of the optimization problem remains same, and is as below. The NLP was solved in AMPL with 24 temporal finite elements and 20 spatial finite volumes. The optimal control profiles are shown in Figure 4.5. Since optimal feeding strategy and pressure profile are different compared to previous case, we obtain an entirely different 2-bed 8-step VSA configuration, illustrated in Figure 4.6. min Power (from Equation (3.15b)) s.t. c(w) = 0 (fully discretized Equations (3.2)-(3.13)) CO2 purity ≥ 0.9 (from Equation (3.14b)) CO2 recovery ≥ 0.85 (from Equation (3.14d)) Qfeed,L+Qfeed,H ≥65kgmolm−2hr−1 Pads ≥ Pd Pdes ≤ Pfeed Pa ≥ Pfeed 0 ≤ α(ti), β(ti), φ(ti) ≤ 1 ∀ti 20sec≤Tc ≤2400sec 101.32 kPa ≤ Pfeed ≤ 600 kPa 101.32 kPa ≤ Pads(ti) ≤ 600 kPa ∀ti Pdes(ti) ≥ 50 kPa ∀ti (4.3) The cycle begins with α(t)=1, β(t)=0 and φ(t) close to one. This suggests a heavy reflux from CnB to CoB and feed being fed to CoB. From the profiles of Pads(t) and Pdes(t), the Chapter 4. Superstructure Case Study: Post-combustion CO2 Capture 63PDF Image | Design and Operation of Pressure Swing Adsorption Processes
PDF Search Title:
Design and Operation of Pressure Swing Adsorption ProcessesOriginal File Name Searched:
anshul_thesis.pdfDIY PDF Search: Google It | Yahoo | Bing
CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
Heat Pumps CO2 ORC Heat Pump System Platform More Info
CONTACT TEL: 608-238-6001 Email: greg@infinityturbine.com (Standard Web Page)