电厂脱硫吸收塔浆液循环泵振动问题的治理

Treatment of vibration problem of slurry circulating pump in desulfurization absorption tower of power plant

沙角C电厂烟气脱硫(FGD)系统增容改造在每台吸收塔原有3台(A、B、C)浆液循环泵的基础上新增了一台D系列的浆液循环泵,泵投运后振动过大,造成机封损坏和轴承损坏事故频发。经振动频谱分析发现,振幅最大值位于该泵5倍的工作频率,倍数正好与泵叶轮叶片数相等,属于水力振动。根据离心泵的相似理论,改造了原有齿轮箱,使其输出转速度下降了18r/min,这样避开了该泵的水力振动区,泵振幅从2.19mm/s大幅下降到0.6mm/s,从而消除了振动,取得了良好的效果。

On the basis of the original 3（A, B, C） slurry circulating pump of each absorption tower, a D series of slurry circulating pump has been added on the basis of the original 3（A, B, C） slurry circulating pump in each absorption tower, and the vibration of the pump is too large after the pump is put into operation, causing the damage of the machine seal and the frequent occurrence of the failure of the bearing？ The vibration spectrum analysis shows that the maximum amplitude is located at the working frequency of 5 times of the pump, and the multiple is exactly the same as the number of impeller blades, which belongs to hydraulic vibration？ According to the similarity theory of centrifugal pump, the original gear box was reformed and its output speed was reduced by 18 r/min, so that the hydraulic vibration area of the pump was avoided, the pump amplitude dropped from 2.19 mm/s to 0.6 mm/s, thus eliminating the vibration, and good effect was achieved？