Quantitative analysis of the impact of flue gas recirculation on the efficiency of oxy-coal power plants

Gopan, Akshay; Verma, Piyush; Yang, Zhiwei; Axelbaum, Richard L.

doi:10.1016/j.ijggc.2019.102936

Title: Quantitative analysis of the impact of flue gas recirculation on the efficiency of oxy-coal power plants

Journal Article · 05 January 2020 · International Journal of Greenhouse Gas Control

DOI: https://doi.org/10.1016/j.ijggc.2019.102936 · OSTI ID:1799744

Gopan, Akshay ^[1]; Verma, Piyush ^[2]; Yang, Zhiwei ^[2]; Axelbaum, Richard L. ^[2]

Washington Univ., St. Louis, MO (United States); OSTI
Washington Univ., St. Louis, MO (United States)

Oxy-combustion typically consists of burning coal with a combination of oxygen and a large amount of recycled flue gas (60–70%) to obtain a similar heat flux profile to that of air-fired systems. As the cost of electricity from first-generation oxy-combustion is relatively high, several new oxy-combustion process concepts have been proposed in recent years, and within these, the proposed amount of flue gas recycle (FGR) has varied from near-zero to 80%. To better understand the fundamental impact of FGR on the efficiency of oxy-combustion systems, a thermodynamic approach is used herein. Second-law losses associated with flue gas recycle are found to be significant and highly non-linear with recycle ratio. A difference in efficiency of up to 10 %-points can be realized, with a maximum efficiency occurring at zero FGR. Furthermore, due to the non-linear relation of plant efficiency with recycle ratio, processes with low recycle (< ~33%) experience only a small efficiency penalty, compared to no recycle. Additionally, fan power requirements also scale non-linearly with recycle ratio, resulting in significantly lower FGR fan power requirements for low recycle processes as well. These results suggest that for systems employing cold recycle, FGR should be kept below 33%. Due to the recent interest in developing pressurized oxy-combustion (POC) for efficient, low-cost carbon capture, the impact of flue gas recycle on POC systems is also presented, with a discussion on the valorization strategies for the latent heat of flue gas moisture recovery.

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Research Organization:: Washington Univ., St. Louis, MO (United States)

Sponsoring Organization:: USDOE; USDOE Office of Fossil Energy (FE)

Grant/Contract Number:: FE0009702; FE0025193

OSTI ID:: 1799744

Journal Information:: International Journal of Greenhouse Gas Control, Journal Name: International Journal of Greenhouse Gas Control Vol. 95; ISSN 1750-5836

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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