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.
All Science Journal Classification (ASJC) codes
- Chemical Engineering(all)
- Fuel Technology
- Energy Engineering and Power Technology
- Organic Chemistry