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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 cycle combustion technology can increase the CO2 concentration (over 90%) in flue gas and is considered as an efficient and low-risk CO2 capture system that is easy to apply to existing thermal boiler technologies or Transformation. The flow field test of the swirling O2 / CO2 pulverized coal burner was carried out in cold state, and the combustion of the pulverized coal in the air atmosphere and O2 / CO2 atmosphere was carried out on a 0.3MW hot test bench. The results show that the velocity distribution along the circumference of the combustor is relatively uniform and there is a recirculation zone in the center of the flow field. The relative length of the recirculation zone is L = 1.38-1.70, the relative width is B = 0.39-0.53, the expansion angle is β = 36 ° ~ 50 °. The flow field formed by the burner can better meet the need of the coal powder igniting and burning under the air condition and the O2 / CO2 atmosphere. Pulverized coal in O2 / CO2 atmosphere, O2 concentration of 23%, its ignition performance is superior to conventional air, and the combustion of flue gas in the CO2 concentration can reach 90%.