作者：金红伟¹, 刘学¹, 何玉灵², 唐贵基², 高运¹

作者单位：1. 华电重工股份有限公司, 北京 100070;
2. 华北电力大学机械工程系, 河北 保定 071003

关键词：给水再循环;管道振动;模态分析;振动控制

摘要：

针对某火电厂给水再循环管道振动的原因和集中位置进行分析并提出相应的控制方案。首先建立再循环管道和水流的实体模型、支吊架简化模型并进行装配，然后导入至ANSYS中进行CFX流体分析，得到水流作用于管道内壁的冲击压力并导入至结构力学模块进行二次分析，再将分析数据传递至模态分析模块进行运算，得到流固耦合作用下管系前50阶的固有频率和前6阶振型，最后结合实验测试结果分析再循环管道振动的原因和振型最大点位置分布规律，并提出相应的支吊架调整干预方案，调整后管系各阶固有频率有所上升，管系振动明显好转，表明所提控制方案可行、有效。该文工作对于火电厂给水再循环管道振动的监测和控制有参考价值。

Vibration analysis and control on water feeding & recycling pipe system of thermal power plant

JIN Hongwei¹, LIU Xue¹, HE Yuling², TANG Guiji², GAO Yun¹

1. Huadian Heavy Idustries Co., Ltd., Beijing 100070, China;
2. Department of Mechanical Engineering, North China Electric Power University, Baoding 071003, China

Abstract: The vibration cause and control method of the water feeding & recycling pipe system in a thermal power plant were analyzed. The 3D models of the pipe, the water, and the simplified cradle were firstly set up and assembled, and then imported into ANSYS CFX for fluid analysis. The pulse pressure was transferred to the inner surface of the pipe to perform a structure calculation, based on which the modal analysis was taken to obtain the former 50-order natural frequencies and the former 6-order vibration modes. Finally, according to the experiment test and the theoretical analysis, the vibration cause and the distribution principles of the vibration amplitude position were investigated, and the cradle adjustment schemes for the vibration control were proposed as well. It shows that the natural frequencies of the pipe system are increased after the cradle adjustment operation, while the vibration amplitudes are significantly decreased. The presented work in this paper offers a reference for the vibration monitoring and control of the water feeding & recycling pipe system in thermal power plants.

Keywords: water feeding & recycling;pipe vibration;modal analysis;vibration control

2016, 42(9): 105-111  收稿日期: 2015-7-5;收到修改稿日期: 2015-9-11

基金项目: 国家自然科学基金（51307058）

作者简介: 金红伟(1982-),男,江苏扬州市人,工程师,主要从事流体分析、管道及压力容器应力分析及管道系统振动控制与改进的相关研究。

参考文献

[1] 谭平,付行军,王斌,等. 电厂输水管系振动分析[J]. 汽轮机技术,2004,42(2):110-112.
[2] 袁寿其,吴登昊,任芸,等. 不同叶片数下管道泵内部流动及振动特性的数值与试验研究[J]. 机械工程学报,2013, 49(20):115-122.
[3] 付永领,荆慧强. 弯管转角对液压管道振动特性影响分析[J]. 振动与冲击,2013,32(13):165-169.
[4] 郑广庆,邢景伟,赵星海,等. 火电厂汽水管道振动的分析及解决方法[J]. 黑龙江电力,2012,35(5):387-390.
[5] 仇云林,许恒,唐璐. 热电厂给水再循环管道振动原因分析及治理[J]. 广西电力,2011,34(2):41-42.
[6] 王树帅,唐璐. 1000 MW汽轮发电机组凝结水管道振动原因分析与处理[J]. 浙江电力,2014(1):30-33.
[7] 张杰. 基于多物理场的管道强度与模态分析(三)管道的流固耦合模态分析[J]. CAD/CAM与制造业信息化,2014(4):71-73.
[8] 陈福江,陈盛广,王军民. 某135 MW机组主蒸汽管道振动原因分析与对策[J]. 陕西电力,2012(3):80-82.
[9] 康豫军,卫大为,安慧,等. 发电机组汽水管道振动特征及其治理[J]. 热力发电,2012(6):62-68.
[10] 冯卫民,宋立,肖光宇. 基于ADINA的压力管道流固耦合分析[J]. 武汉大学学报(工学版),2009,42(2):264-267.
[11] 裴吉. 离心泵瞬态水力激振流固耦合机理及流动非定常强度研究[D]. 镇江:江苏大学,2013.
[12] 孙梁,刘荣梅,姚恩涛. 基于ANSYS LS-DYNA模拟敲击声振法检测叶片脱层[J]. 国外电子测量技术,2014,33(12):65-68,81.