浅析水力原因引起的水轮机振动及其处理方法

水轮机振动是水电站运行中的常见异常现象,简要分析了水轮机振动的水力原因,并提出了解决办法。

略谈水轮机振动的水力原因

水轮发电机组在一般情况下。都会产生振动,但当振动超过一定范围时,将影响机组的稳定性、零部件的强度和使用寿命,从而降低机组出力。当振动严重时,还将引起厂房和压力钢管振动,必须采取措施予以解决。引起水轮发电机组振动有电气、机械和水力方面的原因。本文主要论述水力原因及其消除方法。由水力原因引起水轮发电机组的振动主要有:(1)尾水管中涡带引起的振动;(2)

供热系统水力失调

在区域供暖的过程中,由于系统水力失调经常会出现供热量过多和供热量不足的现象,就水力失调的定义,产生的原因及如何调节进行了简单的阐述。

循环水泵轴弯曲原因分析

循环水泵作为发电厂一种重要辅机,其不同程度的振动问题直接影响机组设备的经济安全运行。由于水泵振源的多样性和存在干扰信号的情况,对水泵振动问题的分析较为复杂。因此,该文基于某电厂水泵泵轴出现的弯曲问题,从水泵固有性质、部件的不平衡力和水力原因3个方面对水泵振动问题和共振现象进行探究,并通过计算数据对比分析水泵的振动特性及运行危害。研究中所使用的计算、分析方法和结论对相似泵站、泵组的安全稳定运行具有一定的实际意义。

Unexplained liver laceration after metastasis radiofrequency ablation

Many studies have established the role of radiofrequency (RF) ablation as a minimally invasive treatment for liver metastases. Although relatively safe, several complications have been reported with the increased use of RF ablation. We describe here a case of unexplained liver laceration after a RF procedure. A woman who presented a solitary metachronous liver metastasis underwent RF ablation treatment for this lesion. Six hours later the patient displayed fatigue and pallor. Emergency blood tests showed a haemoglobin level of < 7 g/dL and markedly elevated transaminase levels. A computed tomography examination revealed two areas of liver laceration with haematoma, one of them following the path of the needle and the other leading away from the f irst. Following a blood transfusion, the patient was haemodynamically stable and completely recovered 24 h later. The patient remained in bed for 1 wk. No surgical intervention was required, and she was discharged 1 wk later.

采暖入口装置的水利调节

在小区供暖系统中,我们经常会看到入口装置的各种调节阀,就它们的作用以及系统水力失调经常会出现供热量过高和不足的现象,产生的原因及如何调节进行了简单的阐述。