Effects of flue gases (CO/CO2/SO2/H2O/O2) on NO-Char interaction at high temperatures

Yijun Zhao, Dongdong Feng, Bowen Li, Pengxiang Wang, Heping Tan and Shaozeng Sun

Energy, 2019, vol. 174, issue C, 519-525

Abstract: The effects of major flue gases (CO/CO2/SO2/H2O/O2) on the NO–char interaction at realistic high temperatures in the reburning zone of boiler are investigated, through the HEFR and HDTF at 1200–1500 °C. The results indicates that CO could significantly promote the NO–char interaction, with its temperature-sensitive region at 3%–5% CO. CO2 (<5%) would promote NO reduction rate by 5–16%, while CO2 in larger concentration has little effect on NO–char interaction. The effect of SO2 on the NO–char interaction is limited. H2O from 0 to 20% would make an increase of NO reduction rate by approximately 18%, with the formation of CO and HCN. 0.8% is the optimal O2 concentration promoting the NO–char reduction. Even with a small amount of oxygen (0.8% O2), the addition of H2O could promote NO reduction at 1200 °C. With O2 from 0.8% to 4% with 10% H2O, the temperature-depending effects of H2O and O2 on NO–char interaction is advanced from 1.0 s to 0.5 s, even earlier. With CO2 from 5% to 11% with 0.8% O2, the temperature-depending effects of CO2 and O2 on NO–char interaction could be advanced from 1.5 s to 0.5 s.

Keywords: Char; Coal; Flue gases; NO (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (6)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:174:y:2019:i:c:p:519-525

DOI: 10.1016/j.energy.2019.02.156

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