摘要
提出了一种利用高温氧气与高浓度煤粉气流直接混合点燃煤粉，进而实现煤粉燃烧器点火的无油点火方式，并设计了一种煤粉高温富氧无油点火装置．以此为基础，搭建了煤粉高温富氧无油点火装置实验系统，对煤粉燃烧器的高温富氧无油点火进行了分析和研究．结果表明，当氧气加热温度超过750℃后，在设计工况条件下，利用高温氧气可以顺利安全地实现点火装置的点火，提高一次风煤粉浓度和风温，提高高温氧气风量，降低一次风速皆有利于煤粉气流的着火和燃烧；煤粉浓度对流场火焰温度的影响最大，在测试范围内（0．2～1．2），流场火焰温度变化可达近800℃；一次风温对氧气所需的加热温度的影响最大，在测试范围内（10～250℃），氧气所需的加热温度变化可达450℃以上；在氧气加热温度相对不足的条件下，在点火过程中则应注意防止“爆燃”现象的发生．
An oil-free ignition method of pulverized coal burner was proposed, which mixes high-temperature oxy- gen and high concentration pulverized coal directly to ignite pulverized coal flow, and the corresponding high- temperature oxygen-enriched oil-free pulverized coal ignition device was designed. At the same time, the ignition experimental system was built and the corresponding study on high-temperature oxygen-enriched oil-free ignition of pulverized coal burner was carried out. The results show that： when the oxygen heating temperature is higher than 750℃, the ignition device could be ignited safely by high-temperature oxygen under the design conditions; the in- crease of pulverized coal concentration, primary air temperature and oxygen flow rate is helpful for pulverized coal ignition and combustion, but the increase of primary air velocity is not conducive to pulverized coal ignition and combustion; pulverized coal concentration is a primary influence factor for the average field temperature, and its variation is over 800℃ within the test range 0.2--1.2; primary air temperature is a primary influence factor for the oxygen heating temperature, and its variation is over 450℃ within the test range 10 - 250℃ ; when the oxygen heating temperature is not high enough, some measures are necessary to avoid the explosion phenomenon in the igni- tion process.
出处
《燃烧科学与技术》
EI
CAS
CSCD
北大核心
2013年第5期400-406,共7页
Journal of Combustion Science and Technology
关键词
高温氧气
煤粉燃烧器
无油点火
点火装置
high-temperature oxygen
pulverized coal burner
oil-free ignition
ignition device
