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首页> 外文会议>The Fourth International Conference on Pumps and Fans (4th ICPF) Aug 26-29, 2002 Beijing, China >TRANSIENT BEHAVIOUR OF A LARGE B'ARREL TYPE BOILER FEED PUMP
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TRANSIENT BEHAVIOUR OF A LARGE B'ARREL TYPE BOILER FEED PUMP

机译：大型B'ARREL型锅炉给水泵的瞬态行为

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In a new large brown coal power station for the first time a combined warm-up and cool-down system was installed for the main boiler feed pump. During the commissioning phase a case of damage occurred with heavy galling of the wear rings at the impeller eyes. The failure evaluation was done using the tran-sient recordings of the control system. These showed that a first rubbing must have occurred during a cooling down transient. To examine above hypothesis, the transient behaviour of the com-plete pump was modelled and analysed by means of finite ele-ment methods. A complete 3D model of the pump was created, including the main stationary parts and the rotor. The time de-pendent temperature distributions of the specific failure tran-sient were calculated followed by the determination of the de-flections at selected points in time. The results of highest inter-est were the displacements at the seal positions. The remaining running clearances of the rotor showed a rubbing at a certain point in time during this transient. The results of this finite element analysis were then used to define control rules for the cooling down transient. For the warming up transient, control rules were set up in a similar way in order to prevent rubbing and assure a minimum clearance at the wear rings. To establish these rules additional temperature measurements were necessary at the interior of the barrel to judge the barrel deformation. After implementing all the above measures the power station has operated successfully for about one and a half years without any further failure of the pump due torubbing at the wear rings.
机译：首次在新的大型褐煤发电站中，为主锅炉给水泵安装了预热和冷却组合系统。在调试阶段，由于叶轮眼处的磨损环严重磨损而发生损坏。使用控制系统的瞬态记录进行故障评估。这些表明在冷却瞬变期间必须发生第一次摩擦。为了检验上述假设，通过有限元方法对完整泵的瞬态行为进行了建模和分析。创建了泵的完整3D模型，包括主要的固定零件和转子。计算特定失效瞬态的时间依赖性温度分布，然后确定所选时间点的挠度。最高的结果是密封位置的位移。转子的剩余运行间隙在此瞬变过程中的某个时间点显示出摩擦。然后，将这种有限元分析的结果用于定义冷却瞬变的控制规则。对于预热瞬态，以类似的方式设置控制规则，以防止摩擦并确保磨损环处的最小间隙。为了建立这些规则，需要在枪管内部进行额外的温度测量以判断枪管变形。采取上述所有措施后，电站已成功运行了大约一年半，而没有由于磨损环上的摩擦而导致泵进一步故障。

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