Formation of NOx precursors during the pyrolysis of coal and biomass. Part X: Effects of volatile-char interactions on the conversion of coal-N during the gasification of a Victorian brown coal in O2 and steam at 800 °C

Fu Jun Tian, Shu Zhang, Jun ichiro Hayashi, Chun Zhu Li

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Abstract

A novel fluidised-bed/fixed-bed reactor was used to study the effects of volatile-char interactions on the conversion of coal-N during the gasification of a Victorian brown coal at 800 °C. The reactor has the capability of controlling the extent and length of the interactions between volatiles and char. Our results indicate that in the absence of volatile-char interactions during gasification in O2, the lack of abundant H radicals led to negligible formation of NH3 and HCN from char-N. The presence of volatile-char interactions during the gasification of Victorian brown coal in O2 at 800 °C drastically enhanced the formation of NH3 and, albeit to a lesser extent, the formation of HCN. The enhanced conversion of char-N into NH3 (and HCN) due to the volatile-char interactions is attributed to the presence of H radicals in the volatiles. H radicals in volatiles could "die off" as they pass through the nascent char bed during the course of volatile-char interactions.

Original languageEnglish
Pages (from-to)1035-1040
Number of pages6
JournalFuel
Volume89
Issue number5
DOIs
Publication statusPublished - May 1 2010
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Organic Chemistry

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