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Article . 2020 . Peer-reviewed
License: Elsevier TDM
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Nitrogen conversion during the rapid pyrolysis of raw/torrefied wheat straw

Authors: Pan Gao; Dezhong Guo; Chao Liang; Gongyi Liu; Shaoxia Yang;

Nitrogen conversion during the rapid pyrolysis of raw/torrefied wheat straw

Abstract

Abstract Nitrogen functionalities play an important role on the conversion of fuel-N during pyrolysis of raw and torrefied biomass while the influences haven’t been clarified yet. The conversion of fuel-N during the rapid pyrolysis of wheat straw (WS) and different torrefied WS was investigated using a fixed-bed reactor at 600–1000 °C and the change of fuel characteristics and nitrogen-containing functional groups in samples were analyzed by TG and XPS. Results showed that the N content of samples increased gradually with torrefaction temperature. The main N functionality of WS was amide-N (N-A), while part of the N-A was converted to pyrrole-N (N-5), pyridine-N (N-6), and quaternary-N (N-Q) during torrefaction. CO2 and O2 can inhibit the transformation of N-A to N-5 and promote the transformation of N-A to N-6. During WS pyrolysis, NH3 was the main NOx precursors at 600–700 °C, while HCN became the main nitrogen-containing gas species at 800–1000 °C and the conversion of (NH3 + HCN)-N was 18.15%–32.0%. After torrefaction, the conversion of NH3-N decreased in varying degrees, especially at low pyrolysis temperature (600–700 °C). The conversion of HCN-N increased with temperature during torrefied WS pyrolysis which was similar to that of WS, but the conversion decreased greatly at 800–1000 °C. Torrefaction atmosphere has a substantial effect on the conversion of fuel-N. In particular, WS torrefied in CO2 of O2 atmosphere can promote the conversion of fuel-N to harmless N2 during pyrolysis.

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
26
Top 10%
Average
Top 10%