煤气化装置除氧水泵汽蚀振动的探讨及处理

Discussion and Treatment of Cavitation Induced Vibration Occurred in Deoxidation Water Pump in Coal Gasification Plant

为了解决气化装置除氧水泵频繁出现振动故障的实际问题,对进口管道布置、泵出口流量、泵壳温度、进口压力及联轴器同心度引起振动的原因进行了分析,并叙述了优化、处理措施。结果显示,泵进口管道布置的缺陷导致管道内易积渣或结垢,使管道有效尺寸减小,出现汽蚀现象;泵出口最佳效率点流量近似为215 m3/h,偏离最佳效率点流量较大时,会使泵壳温度升高,引起汽蚀振动;泵进口压力在300~320 k Pa范围、泵壳温度低于115℃时,不会发生汽蚀现象,振动值较小;泵与电机之间联轴器的同心度偏差大时,泵振动值会增大。

In order to solve the problem of frequent vibration occurred in deoxygenating pump used in gasification plant, the cause was analyzed in this article from the aspects of inlet pipe arrangement, flow at pump outlet, temperature in pump shell, pressure at pump inlet and concentricity of coupler. It was shown from the results that inappropriate arrangement of piping resulted in scaling in interior of pipe and made effected size inside of pipe reduced and cavitation created; the optimum flow at outlet for efficiency is approximately 215 m3/h, and when the flow has relatively large deviation, the temperature in pump shell increases which also makes cavitation created; the pressure at inlet is within 300~320 k Pa and the temperature of shell is lower than 115 ℃, there is no cavitation produced and only a little vibration exists; the larger the concentricity of coupler, the larger vibration produced.