超临界塔式锅炉振动原因分析及处理  

Reason analysis and treatment for vibration in a supercritical unit tower type boiler

作　　者：边防[1] 张玉刚[1] 王怀勇[1] 杨志宇[1] 曹汉鼎[1] 

机构地区：[1]华能吉林发电有限公司九台电厂,吉林九台130501

出　　处：《热力发电》2015年第5期113-117,共5页Thermal Power Generation

摘　　要：华能九台电厂2台600MW级燃烧褐煤的超临界塔式锅炉在高负荷工况下,锅炉本体上部及尾部烟道均存在高频振动问题,造成受热面频繁泄漏。分析认为,锅炉振动是由发生在锅炉受热面管子的卡门涡流脱落引起的脱落涡振频率与发生在锅炉烟室的声学驻波频率产生共振所致。对此,提出了在烟道内加装隔板,通过改变烟室的声学驻波频率来消除共振。该方案实施后,不仅彻底消除了锅炉振动,而且未再发生末级过热器壁温大面积超限等不良现象,改造效果良好。High frequency vibration occurred in upper part and tail flue duct of the 600 MW supercritical unit tower type boiler firing lignite in Huaneng Jiutai Power Plant,resulting in frequent heat leakage of heat surface. Analysis shows the major reason is the sympathetic vibration between the vortex shedding fre- quency resulted from the Karman vortex shedding from the heating surface and the acoustic standing wave frequency occurred in gas room. Therefore, to eliminate the sympathetic vibration by changing the acoustic standing wave frequency in gas room,a countermeasure that adding baffles in the flue duct was proposed. After the baffles were added, the boiler vibration was thoroughly eliminated. Moreover, over temperature of the final super heater tube wall with large area never occurred again.

关 键 词：塔式锅炉 卡门涡流 脱落涡振 声学驻波 振动 

分 类 号：TK229.2[动力工程及工程热物理—动力机械及工程] TK223.3