Experimental Study and Numerical Simulation on High-temperature Oxygen-enriched Oil-free Pulverized Coal Ignition

An oil-free ignition method was proposed for mixture flow of high-temperature oxygen and dense phase pulverized coal, so as to study the high-temperature oxygen-enriched oil-free pulverized coal ignition process. Numerical simulation was carried out to analyze the flow field in the self-developed oil-free ignition facility. Results show that when the oxygen is heated up to 750 ℃, the mixture flow of high-temperature oxygen and pulverized coal can be ignited successfully under design conditions; it is favorable for the ignition and combustion of pulverized coal flow to raise the primary air temperature, pulverized coal density and oxygen flow rate, and to reduce the primary air velocity; the ignition starts directly ahead of the center tube nozzle, and the average temperature in the flow field is above 2 000 K, with a highest temperature above 3 000 K, which is located on both sides of the center tube axis.