1000 MW汽轮发电机组润滑油管线压力脉动分析  

Pressure instability of oil supply pipes in a 1 000 MW unit turbine

作　　者：郭轶波 王欣欣 何颖 GUO Yibo WANG Xinxin HE Ying(Fujian Fuqing Nuclear Power Co., Ltd., Fuqing 350318, China)

机构地区：[1]福建福清核电有限公司,福建福清350318

出　　处：《热力发电》2017年第7期126-130,共5页Thermal Power Generation

摘　　要：某压水堆核电厂汽轮发电机润滑油管线存在压力脉动和异常振动。通过系统工况分析的方法对影响润滑油管线压力的主要因素进行了分析和验证;并采用角动量守恒分析方法对额定工况下主油泵出口止回阀的最小稳定介质流速进行了计算,对阀门在低流速下的流动特性及阻力系数的变化进行了分析。结果表明:旋启式止回阀阀瓣在低流速下不完全开启,受上游流体扰动影响失稳振荡,进而造成阀门阻力系数的变化是汽轮发电机润滑油管线压力脉动的原因;因此,需要在系统设计和设备选型阶段提出止回阀稳定在全开状态下的最小流速要求,在确定最小流速的基础上核算相应的流量系数的改进方案。分析方法适用于解决因止回阀选型及管道布置引起的系统压力脉动。Unexpected vibration and noise was found on turbine oil supply mains. Through system condition analysis method, the major factors influencing the pressure in turbine oil supply pipes were investigated. The angular momentum conservation method was employed to calculate the minimum stable fluid velocity of check valve at the main oil pump outlet under rated condition. Moreover, the flow characteristics and resistance coefficient change were also analyzed when the valve is in low fluid velocity. The results show that, the swing check valve at low fluid velocity is incompletely open, resulting in unstable oscillation when disturbed by upstream fluids, then the flow resistance coefficient of the valve changes, thus the pressure in the oil supply pipes fluctuates. It proposed that, during the system design and equipment selection, the check valve should be required being stable at the minimum velocity in fully open state, and the corresponding flow coefficient under certain minimum open velocity should be ascertained. This analysis method is suitable to solving the pressure fluctuation problem caused by check valve type selection and pipeline arrangement.

关 键 词：管道振动 旋启式止回阀 最小稳定流速 压力脉动 阻力系数 阀门开度 阀瓣 

分 类 号：TK14[动力工程及工程热物理—热能工程]