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提出了利用高温氧气与高浓度煤粉气流直接混合来实现煤粉气流点火的无油点火方式,采用煤粉高温氧气无油点火实验装置对煤粉气流的高温氧气无油点火过程进行了研究,利用数值模拟方法对该点火装置的流场特性进行了分析.结果表明:当氧气加热温度超过750℃后,设计工况条件下利用高温氧气可以顺利安全地实现煤粉气流的点火;提高一次风温度、增大一次风煤粉浓度及高温氧气风量或减小一次风速度有利于煤粉气流的着火和燃烧;煤粉气流在点火装置中心管喷口正前方首先开始着火,流场平均温度可达2 000K以上,最高温度超过3 000K,温度最高的区域位于中心管轴线的两侧.
The ignition method of high temperature oxygen gas and high concentration pulverized coal flow to realize the ignition of pulverized coal airstream was proposed. The pulverized coal high temperature oxygen-free oil ignition experiment device was used to study the high-temperature oxygen-free oil ignition process of pulverized coal airstream. The flow field characteristics of the ignition device were analyzed by numerical simulation.The results show that the ignition of the pulverized coal flow can be smoothly and safely achieved by using high temperature oxygen under the designed working conditions when the heating temperature of oxygen exceeds 750 ℃, Temperature, increasing primary air pulverized coal concentration and high temperature oxygen air volume or reducing primary air velocity are favorable for the ignition and combustion of the pulverized coal gas stream; the pulverized coal gas stream first starts to fire right in front of the central tube nozzle of the ignition device and the average temperature of the flow field is up to Above 2 000 K, the maximum temperature exceeds 3 000 K and the areas of highest temperature are located on either side of the central tube axis.