Study of the optimized design of high temperature oxygen-enriched oil-free ignition of pulverized coal

Designed was a pulverized coal high temperature oxygen-enrichend oil-free ignition device. It utilizes the mixture of high temperature oxygen and high concentration pulverized coal to directly ignite the pulverized coal and to replace the oil gun, thus realizing an oil-free ignition of pulverized coal. Through a cold-state flow field measurement test, the device under discussion was structurally optimized. On this basis, a numerical simulation of the high temperature oxygen-enriched oil-free iginition of pulverized coal was performed. The research results show that when the device adopts a triangular flow guiding cone, the semi-angle of the spout flaring of the central tube is set at 15 degrees and that of the spout flaring of the high temperature oxygen passage is set at 25 degrees, the conditions in the flow field thus organized is relatively good. The temperature of the high temperature torch of the oxygen-enriched combustion formed by the device can be as high as 3000 K and above, and the average temperature of the flue fas can reach over 2000 K, thus effectively guaranteeing a successful ignition of the main burner.