Thermodynamic analysis and profitability study of a power unit with an added CO2 capture plant

Łukasz Kowalczyk, Paweł Niegodajew, Stanisław Drobniak, Witold Elsner

Abstract


Concerns over greenhouse gas emissions are driving a requirement for newly built coal power units to satisfy
the so-called “capture ready” conditions. This paper presents the a thermo-economic analysis supplemented by
a cost evaluation of a power unit for ultra-supercritical parameters expanded by an amine-based CO2 capture
plant. The analysis was performed with the use of an integrated package containing the IPSEpro, MATLAB and
Revenue Requirement Method implemented in MOExcel. The 0D model of a post combustion capture installation
was developed based on complex CFD calculations of the absorber and stripper. A number of CFD simulations
were conducted to create a large database, which was then utilized to develop suitable correlations describing the
process
Thermodynamic and economic calculations were performed in respect of a power plant coupled with a CO2
separation unit for a varying ratio of amine solvent to the exhaust gas stream (L/G). A local minimum for reboiler
heat duty was found for L/G3.5 revealing the optimal post combustion capture configuration. It was observed that
complementing the power unit with a post-combustion capture (PCC) installation causes a slight increase in the
investment costs due to the drop in efficiency, but more important is the rise in total cost due to the investment
associated with the CO2 capture plant. It was found that about 14 years is required to compensate the investment
cost of the PCC installation.

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