摘要
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.
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.
出处
《动力工程学报》
CAS
CSCD
北大核心
2013年第11期833-840,901,共9页
Journal of Chinese Society of Power Engineering
关键词
煤粉燃烧器
高温氧气
无油点火
点火装置
数值模拟
pulverized coal burner
high-temperature oxygen
oil-free ignition
ignition device
numerical simulation
