一种用于携带流反应器试验台的煤粉燃烧器的优化设计

为了优化一种用于携带流反应器系统的煤粉燃烧器结构参数,降低氮氧化物排放,本文利用计算流体动力学软件FLUENT对该煤粉燃烧器结构参数的优化过程进行了数值模拟研究,并与试验结果进行了对比验证。结果表明,燃烧器一次风喷口采用扩口结构以及对冲二次风的引入均能有效的促进二次风与一次风煤粉的混合,增强煤粉着火及燃烧的稳定性。适当增加二次风喷口与一次风喷口的间距可以加速煤粉的燃尽。采用优化后的结构参数可以获得更低的氮氧化物排放,为基于携带流反应器系统的燃煤污染物减排研究提供了坚实的基础。

Optimal Design of a Pulverized Coal Burner Based on Entrained Flow Reactor

The computational fluid dynamics （CFD） code,FLUENT,is employed to evaluate the optimization process of burner structure of the entrained flow reactor,and the contrast verification was compared with experimental results.The aim of the research is to get the optimized structure parameter and reduce NOx emissions with this burner.Results indicate that the flaring structure of primary air nozzle and the injection of the secondary air through the two opposed nozzles can enhance the mixing of the secondary air into the primary air,and obviously improve pulverized coal fire and combustion stability.The burnout of pulverized coal could be accelerated effectively by appropriately increasing the space of secondary air nozzles and primary nozzle.Lower NOx emissions can be obtained during the optimized structure of burner used,which has provided a solid foundation for NOx abatement technologies under entrained flow reactor.