Techno-Economic Analysis of a 600 MW Oxy-Enrich Pulverized Coal-Fired Boiler

Ming Lei, Cen Sun and Chunbo Wang
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Ming Lei: School of Energy and Power Engineering, North China Electric Power University, Baoding 071000, China
Cen Sun: School of Energy and Power Engineering, North China Electric Power University, Baoding 071000, China
Chunbo Wang: School of Energy and Power Engineering, North China Electric Power University, Baoding 071000, China

Energies, 2018, vol. 11, issue 4, 1-12

Abstract: Oxy-fuel combustion is one of the most promising methods for CO 2 capture and storage (CCS) but the operating costs—mainly due to the need for oxygen production—usually lead to an obvious decrease in power generation efficiency. An “oxy-enrich combustion” process was proposed in this study to improve the efficiency of the oxy-fuel combustion process. The oxidizer for oxy-enrich combustion was composed of pure oxygen, air and recycled flue gas. Thus, the CO 2 concentration in the flue gas decreased to 30–40%. The PSA (pressure swing adsorption), which has been widely used for CO 2 removal from the shifting gases of ammonia synthesis in China, was applied to capture CO 2 during oxy-enrich combustion. The technological economics of oxy-enrich combustion with PSA was calculated and compared to that of oxy-fuel combustion. The results indicated that, compared with oxy-fuel combustion: (1) the oxy-enrich combustion has fewer capital and operating costs for the ASU (air separation unit) and the recycle fan; (2) there were fewer changes in the components of the flue gas in a furnace for oxy-enrich combustion between dry and wet flue gas circulation; and (3) as the volume ratio of air and oxygen was 2 or 3, the economics of oxy-enrich combustion with PSA were more advantageous.

Keywords: oxy-fuel combustion; oxy-enrich combustion; PSA; technological economy (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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