切向燃烧摆动喷口附加进风诊断模型

Diagnosis Model of Additional Air Flow Through Gaps of Tangential Firing Oscillating Nozzles

利用二次风挡板和炉膛阻力特性的冷态测试结果,并根据实际运行时锅炉风箱与炉膛出口之间的差压、二次风挡板开度和风粉质量流量等参数,得到风箱与炉膛出口差压对烟风质量流量的跟随特性,采用多个负荷工况的测试数据,以炉膛出口过量空气系数计算值和测量值的偏差平方和最小为原则,建立了切向燃烧摆动喷口附加进风质量流量运行评估模型.在1台实际运行锅炉上的应用表明:利用该评估模型所得计算结果与设计数据相当,炉膛出口过量空气系数的计算结果与实测值吻合;该评估模型可用于燃烧器喷口状态诊断.

A finite element model was established for the coupling to identify the hazardous location where the bolt hole wall squeezes with the bolt,then to calculate the maximum equivalent stress in the hazardous location when the coupling transmits torques of different values,so as to fit the relational expression between the torque and the maximum equivalent stress.Finally,a two-phase short circuit fault was simulated to get the electromagnetic torque response,based on which instantaneous local stress sustained by the coupling and bolts could be obtained with above relational expression.Results show that when torsional vibration appears on the turbo-generator shaft,the torque undertaken by the coupling fluctuates,where the stress would be in the alternating state,and fatique failure would occur in the parts bearing alternative stresses.