摘要
对比研究了一种新型旋流式氧煤喷枪与普通单管喷枪的喷煤特性,主要考察了直吹管内流场、浓度场及煤粉的燃烧情况.结果表明,采用该氧煤枪喷吹时,在直吹管内形成的低速区面积更大,在距喷枪口30 mm范围内形成了明显的回流区,在距喷枪口200 mm范围内形成了富氧、富煤的强湍流区域;与普通单管喷枪相比,旋流式氧煤喷枪使煤粉温度提高近100 K,有助于挥发分挥发,燃尽率由4.96%提高到15.53%.
Injection characteristics of coal powder by a new type swirling oxygen-coal lance were studied in comparison with an ordinary single-tube one, and. the flow field, concentration field and pulverized coal combustion in the blowpipe examined. The results showed that the new lance generated a greater low velocity zone in the blowpipe, within 30 mm away from the outlet of the lance a clear recirculation zone formed, and within 200 mm away from that an oxygen enrichment zone with high pulverized coal concentration and strong turbulence formed. When the new swirling oxygen-coal lance was used, coal powder temperature was raised near 100 K, being beneficial to volatilization of volatiles in the coal, and its burnout rate was increased from 4.96% to 15.53%.
出处
《过程工程学报》
CAS
CSCD
北大核心
2013年第5期748-753,共6页
The Chinese Journal of Process Engineering
关键词
喷煤
旋流式氧煤喷枪
数值模拟
流场
浓度场
燃烧
pulverized coal injection
swirling oxygen--coal lance
numerical simulation
flow field
concentration field
combustion
