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A study of the interaction between volatile and char on the mechanism of NO and N2O conversion during nitrogen-containing biomass model (amino acids) combustion

Author

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  • Ma, Rui
  • Zhang, Hai
  • Fan, Weidong

Abstract

The interaction between volatile and char is widespread in combustion. The effect of this interaction on the conversion of fuel-N to NOx is significant, but the mechanism remains to be comprehensively unveiled. Thus, in this paper, the NO and N2O conversion of nitrogen-containing biomass models (glutamate, glycine, phenylalanine) during combustion at high temperatures (800–1500 °C) is investigated using two combustion modes, separated combustion (in which volatile and char are burned separately) and coupled combustion (in which volatile and char are burned simultaneously), in an O2/Ar atmosphere. A new pathway for N2O formation resulting from the interaction between volatile and char is identified. At low temperatures, this interaction facilitates the conversion of fuel-N to N2O. For instance, during the separated combustion of glutamate at 800 °C, the conversion rates of fuel-N to N2O and NO are 26.3 % and 20.4 %, respectively. However, in coupled combustion, these conversion rates shift to 48.1 % for N2O and 3.6 % for NO. At high temperatures, this interaction promotes the conversion of fuel-N to NO. For instance, during the separated combustion and coupled combustion of glutamate at 1500 °C, the conversion rates of fuel-N to NO are 6.2 % and 16.6 %, respectively. Similar patterns are observed for the other two amino acids. In both combustion modes, the co-firing of cellulose, lignin, and hemicellulose with glutamic acid significantly suppresses the production of N2O. The conversion rate of N2O decreases by about 7 %–10 %, while the impact on NO release shows either a suppressive or promotive effect in different temperature intervals. These results play a crucial role in the development of efficient and clean combustion technology for biomass.

Suggested Citation

  • Ma, Rui & Zhang, Hai & Fan, Weidong, 2024. "A study of the interaction between volatile and char on the mechanism of NO and N2O conversion during nitrogen-containing biomass model (amino acids) combustion," Energy, Elsevier, vol. 297(C).
    • Handle: RePEc:eee:energy:v:297:y:2024:i:c:s0360544224010181
    DOI: 10.1016/j.energy.2024.131245
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    1. Ge, Jun Cong & Wu, Guirong & Yoo, Byeong-O & Choi, Nag Jung, 2022. "Effect of injection timing on combustion, emission and particle morphology of an old diesel engine fueled with ternary blends at low idling operations," Energy, Elsevier, vol. 253(C).
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