Air and oxyfuel combustion of torrefied biomass in new spiral combustion reactor (original) (raw)

2013

Abstract

A new spiral reactor was designed to study visually the combustion characteristics of solid fuel. The ignition and combustion time of torrefied biomass was investigated under different temperature in O2/N2 and O2/CO2 atmosphere . High speed camera was used to determine the ignition and combustion time of the fuel. The ignition and combustion time decreases as the reactor temperature increases. Statistically describing, ignition time has lower standard deviation than combustion time as the former is mainly depend on the gas temperature and the availability of oxygen around. At lower temperatures between 500-600 C sudden decrease in ignition time was shown, which was the lowest temperature where ignition commences . Finally, changing the gas composition from O2/N2 and O2/CO2 (both 21% O2) showed increase in ignition time as the CO2 has high heat capacity which lowers the temperature round the particle.

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