Journal
APPLIED THERMAL ENGINEERING
Volume 103, Issue -, Pages 747-758Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2016.04.145
Keywords
Exhaust gas recirculation; Natural-gas power plant; Process design; Economic analysis
Funding
- University of Engineering and Technology, Lahore Pakistan
- University of Sheffield, UK
- Engineering and Physical Sciences Research Council [EP/K000446/1, EP/K000446/2, EP/M001482/1, EP/K02115X/1] Funding Source: researchfish
- EPSRC [EP/M001482/1, EP/K02115X/1, EP/K000446/2, EP/K000446/1] Funding Source: UKRI
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Post-combustion CO2 capture systems are gaining more importance as a means of reducing escalating greenhouse gas emissions. Moreover, for natural gas-fired power generation systems, exhaust gas recirculation is a method of enhancing the CO2 concentration in the lean flue gas. The present study reports the design and scale-up of four different cases of an amine-based CO2 capture system at 90% capture rate with 30 wt.% aqueous solution of MEA. The design results are reported for a natural gas-fired combined cycle system with a gross power output of 650 MWe without EGR and with EGR at 20%, 35% and 50% EGR percentage. A combined process and economic analysis is implemented to identify the optimum designs for the different amine-based CO2 capture plants. For an amine-based CO2 capture plant with a natural gas-fired combined cycle without EGR, an optimum liquid to gas ratio of 0.96 is estimated. Incorporating EGR at 20%, 35% and 50%, results in optimum liquid to gas ratios of 1.22, 1.46 and 1.90, respectively. These results suggest that a natural gas-fired power plant with exhaust gas recirculation will result in lower penalties in terms of the energy consumption and costs incurred on the amine-based CO2 capture plant. (C) 2016 Elsevier Ltd. All rights reserved.
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