摘要
西北缺水地区调相机多采用闭式外冷水系统(干湿联合),该系统主要由空冷岛和蒸发冷却塔组成。部分站调相机空冷岛风机自投运以来电机烧毁严重,导致换热效果大幅下降,严重影响机组安全稳定运行。通过对空冷岛运行状况现场勘查测试,发现变频风机和工频电机烧毁数量有所差异。仿真分析发现以下问题:设计时变频风机使用的是变频器+常规电机的方式,因变频器为一拖多方式导致脉冲电压过大、破坏绕组绝缘;站址位于西北地区,风沙大,空冷岛缺少防护措施,换热器翅片堵塞严重;侧风影响严重,气流组织倒灌导致换热效果不佳;电机选型不满足要求,电机防护等级低,导致电机进水生锈。针对以上情况,提出更换轴承使用寿命长、防护等级更高的专用变频电机,风机拆除风筒和风阀改为加装防冻棚等措施。
The closed external cold water system(dry and wet combination)is mainly used in the water shortage area in northwest China,which is mainly composed of air cooling island and evaporative cooling tower.Since the air cooling island fan of some stations has been put into operation,the motor has been burned seriously,resulting in a significant decrease in heat transfer effect,which seriously affects the safe and stable operation of the unit.Through the field investigation and test of the operation condition of the air cooling island,it is found that there is a difference in the number of burnout between the frequency conversion fan and the power frequency motor.The following problems are found in the study and analysis:the frequency converter+conventional motor is used in the design of the inverter,because the frequency converter is a multi mode,the pulse voltage is too large to destroy the winding insulation;The site is located in the northwest of China,the air cooling island lacks protective measures,and the heat exchanger fins are clogged seriously.Crosswind has a serious effect,and the airflow structure backfilling leads to poor heat transfer effect.Motor selection does not meet the requirements,the motor protection level is low,resulting in motor water rust.In view of the above situation,it is proposed to replace the special frequency conversion motor with long bearing life and higher protection grade,and remove the air duct and air valve of the air cooling island fan to install an anti-freezing shed.
作者
郝亚楠
王俊
颜庆
李贵海
郭语
HAO Yanan;WANG Jun;YAN Qing;LI Guihai;GUO Yu(State Grid Shandong Electric Power Research Institute,Jinan 250003,China;Shandong Smart Grid Technology Innovation Center,Jinan 250003,China;Shandong Zhongshi Yitong Group Co.,Ltd.,Jinan 250003,China)
出处
《山东电力技术》
2025年第6期95-104,共10页
Shandong Electric Power
基金
国网山东省电力公司电力科学研究院自主研发项目(ZY-2023-10)。
关键词
调相机
空冷岛
风机
变频器
synchronous condenser
air cooling island
fan
converter
