水煤浆旋流燃烧器空气动力场的数值研究

水煤浆是一种以煤代油的新型洁净环保燃料。对水煤浆旋流燃烧器的空气动力场进行了数值模拟,分别研究了一次风扩口角度、二次风扩口角度和二次风旋流强度等燃烧器结构参数对流场的影响,研究结果表明,一次风扩口角度的增加使回流区由大变小;二次风扩口角度和旋流强度的增加均使回流区增大;此类燃烧器轴向速度以"M"形分布,切向速度以"N"形分布,出口处形成一中心回流区;得到了一合理的燃烧器结构型式,该燃烧器既能保证稳定燃烧,又能有效防止结焦或结渣。研究结果为水煤浆燃烧器的设计、制造和运行提供了借鉴。

Numerical Studies on the Aerodynamic Field of Coal Water Slurry Swirling Burner

Coal water slurry (CWS) is a new clean fuel as a substitute of oil. The aerodynamic field of CWS swirling burner was numerically simulated. The effect of the swirl intensity of secondary air and the outlet angle of primary air and secondary air on the flow field was studied respectively. The results indicate that the recirculation region initially enlarges and then reduces with the increase of the outlet angle of primary air, and it enlarges gradually with the increase of the outlet angle of secondary air and its swirl intensity; the axial velocity of this kind of swirling burner is distributed in 'M' type, and the tangential velocity in 'N' type; there exists a central recirculation region at the exit of the burner. A suitable CWS swirling burner was designed, which provided stable burning and avoided slagging. The research results obtained in the present work are very helpful for the design, manufacture and operation of CWS swirling burner.