旋流型O_2/CO_2煤粉燃烧器的流动及燃烧试验研究  

Experimental Study of O_2/CO_2 Swirled Burner of Pulverized Coal on Flow Field and Combustion

作　　者：丘纪华[1] 邹春[1] 刘敬樟[1] 李刚[1] 李曼丽[1] 郑楚光[1] 

机构地区：[1]煤燃烧国家重点实验室(华中科技大学),湖北省武汉市430074

出　　处：《中国电机工程学报》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)~~

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.

关 键 词：煤粉燃烧器 O2/CO2循环燃烧 旋流 

分 类 号：TK223[动力工程及工程热物理—动力机械及工程]