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

The device of high-temperature oxygen-enriched oil-free pulverized coal ignition was designed in this paper, which could replace the oil gun and achieve oil-free pulverized coal ignition by mixing high-temperature oxygen and high concentration pulverized coal. The structure of ignition device was optimized by the experiment of measuring cold flow field, and the related numerical simulation on high-temperature oxygen-enriched oil-free pulverized coal ignition was done. The results show that a satisfied flow field could be organized successfully when the half-angles of central tube nozzle and high-temperature oxygen channel nozzle were 15 and 25 in the ignition device that uses the cone diversion body; the oil-free pulverized coal ignition could be achieved successfully by using high-temperature oxygen under the appropriate condition and the ignition characteristic of coals was different in high-temperature oxygen-enriched oil-free ignition: the ignition of lignite is quite easy, but anthracite can not be ignited under the typical conditions; improving the temperature and pulverized coal concentration of primary air, increasing the temperature of high temperature oxygen and decreasing the velocity of primary air are helpful for achieving high-temperature oxygen-enriched oil-free pulverized coal ignition.