Experimental investigation of pyrolysis and char burnout kinetics in a Well-Stirred-Reactor under flame and burn-out conditions

  FTIR WSA Fourier-Transform Infrared Spectrometer (FTIR) with IR source and HeNe laser in operation

The Oxyflame subproject A1 investigates the combustion of synthetic carbon, coal and biomass under conditions similar to pulverized coal (PC) burners. The objective is to model the kinetics in oxy-fuel-atmosphere, i.e. the release of mass and energy from a fuel particle.

When using solid fuels, combustion can be divided into the two sub-processes pyrolysis and char burnout. Pyrolysis depicts the process of releasing volatiles (e.g. carbon hydrides and nitrogen compounds) from a fuel particle. Char burnout is the oxidation of the carbon rich remainder.

The conditions in the hot zone of PC boilers are being approximated in a Fluidized Bed Reactor (FBR), in which high heat-up rates and long residence times can be realized. Long residence times are an essential element of this System, because the process of char burnout typically runs significantly slower than that of pyrolysis. Furthermore pyrolysis and char burnout can be analyzed separately in this reactor.