Experimental study of O2/CO2 swirled burner of pulverized coal on flow field and combustion

O2/CO2 recycled combustion can produce higher CO2 concentration in flue gas (up 90% by volume), this approach is regarded as an efficient and low-risk for CO2 capture method, and can be convenient applied and retrofitted for today power plant boilers. The O2/CO2 swirled burner of pulverized coal was studied at flow field and pulverized coal combustion in air and in O2/CO2 at 0.3 MW down-fired combustor. The flow field showed that the velocity along circle of the burner be uniform almostly, and there is a reflow zone formed at center of the flow field at down-steam the port, the relatively length and width of reflow zone are L=1.38-1.70 and B=0.39-0.53 respectively. The spread angle of the stream is β=36°-50°. The gas temperature profiles of the experimental show that the ignition and combustion in O2/CO2 (O2 concentration 23% by volume) can be better than in air, and CO2 concentration of flue gas with O2/CO2 combustion can be reached 90% and more. © 2010 Chin. Soc. for Elec. Eng.