Numerical investigation of CO2 and NOx emission in a CFB combustor with flue gas recycle and oxy-fuel combustion redesign. (19th October 2021)

• Record Type: Journal Article
• Authors: Li, Zhenxing; Gao, Yangyan; Wu, Shaohua; Hao, Yanhong
• Is Part Of: International journal of global warming. Volume 25:Number 2(2021)
• Page Start: 177
• Page End: 190
• Publication Date: 2021-10-19
• Subjects: flue gas recycle -- O2/CO2 atmosphere -- CFD simulation -- circulating fluidised bed combustor; Global warming -- Periodicals; Global warming -- Statistics -- Periodicals; Global warming -- Economic aspects -- Periodicals; Climatic changes -- Periodicals; Climatic changes -- Economic aspects -- Periodicals; Climatic changes -- Environmental aspects -- Periodicals; 363.73874
• Languages: English
• ISSNs: 1758-2083

Abstract

Flue gas recirculation (FGR) technology and oxy-fuel combustion strategy are combined to recycle CO2 in a CFB combustor and to limit the emission of NOx and CO2 . The combustion process in O2 /N2 and O2 /CO2 atmospheres is numerically investigated in the CFB combustor. The NOx emission can be effectively reduced using FGR technology both in O2 /N2 atmosphere or O2 /CO2 atmosphere, which is inversely proportional to the FGR ratio. With O2 /CO2 mixtures as the oxidant, the average combustion temperature is lower than that with O2 /N2 mixtures when the mole fraction of O2 is 21%. However, increasing FGR ratio has little effect on NOx emission and CO2 enrichment, even if CO2 gas is enriched in the flue gas. While using O2 /CO2 mixtures as the oxidant, CO2 could account for more than 90 vol.% in the dried flue gas, thus the CO2 can be easily captured from the flue gas.