摘要
O2/CO2循环燃烧技术可以提高烟气中的CO2浓度(90%以上),被认为是一种效率高、风险低的CO2捕集方式,易于在现有火力发电锅炉技术的基础上进行应用或改造。对旋流型O2/CO2煤粉燃烧器进行了冷态流场试验,并在0.3MW的热态试验台上进行了该燃烧器的空气气氛和O2/CO2气氛下的煤粉燃烧实验。研究结果表明,沿该燃烧器出口圆周上的速度分布比较均匀,在流场中心有回流区形成,回流区的相对长度L=1.38～1.70,相对宽度为B=0.39～0.53,扩张角β=36°～50°。该燃烧器形成的流场能够较好地满足煤粉在空气条件、O2/CO2气氛条件下着火燃烧的需要。煤粉在O2/CO2气氛,O2浓度为23%时,其着火性能优于常规空气,且燃烧后的烟气中CO2浓度可以达到90%以上。
O2/CO2 recycled combustion can produce higher CO2 concentration in flue gas （up 90% by volume）,this approach is regarded as an efficient and low-risk for CO2 capture method,and can be convenient applied and retrofitted for today power plant boilers.The O2/CO2 swirled burner of pulverized coal was studied at flow field and pulverized coal combustion in air and in O2/CO2 at 0.3 MW down-fired combustor.The flow field showed that the velosity along circle of the burner be uniform almostly,and there is a reflow zone formed at center of the flow field at down-steam the port,the relatively length and width of reflow zone are L=1.38-1.70 and B=0.39-0.53 respectively.The spread angle of the stream is β=36°-50°.The gas temperature profiles of the experimental show that the ignition and combustion in O2/CO2 （O2 concentration 23% by volume） can be better than in air,and CO2 concentration of flue gas with O2/CO2 combustion can be reached 90% and more.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2010年第17期1-5,共5页
Proceedings of the CSEE
基金
国家高技术研究发展计划项目(863计划)(2009AA05Z315)
国家重点基础研究发展规划基金项目(2006CB705806)~~
关键词
煤粉燃烧器
O2/CO2循环燃烧
旋流
pulverized coal burner
O2/CO2 recycled combustion
swirled flow
