ANALYSIS OF THE FLAME FORMED DURING OXIDATION OF PULVERIZED COAL BY AN O-2-CO2 MIXTURE

Pulverized coal combustion with oxygen and recycled flue gas constitut es a promising system to recover CO2 from the exhaust gases of boilers . Our previous combustion tests on this system suggest emissions of sm aller amounts of NOx than in conventional combustion and reduced ignit ion stability of the burner. In order to improve the combustibility of the O-2/CO2-pulverized-coal burner, numerical simulations and combust ion tests were performed. An oxygen-injection nozzle was added to the burner. Simulation results predicted the effectiveness of direct oxyge n injection and were confirmed qualitatively by bench-scale combustion tests on gas temperatures.