Abstract
Experimental study for clarifying the effect of combustion mechanism on reforming producer gas was conducted. The inversed diffusion flame was formed in the actual gas reformer by partial combustion of producer gas. Direct observation and laser diagnosis were applied to the inverse diffusion flame. Experimental parameters are steam concentration in supplied model producer gas (X_<steam>) corresponding to moisture content of wood. The main results are as follows. In the condition of 20 % concentration of oxygen, flames at nozzle and lifted flames were formed in the same supply condition by hysteresis. When the flames at nozzle were formed, the exergy yield was increased with the increase of X_<steam> because soot formation was suppressed and steam reforming of model tar could proceed. In contrast, when the lifted flames were formed, the exergy yield was decreased with the increase of X_<steam> because of formation of SOF (soluble organic fraction).
