深度调峰工况下锅炉典型爆管位置损伤机理分析  

ANALYSIS ON DAMAGE MECHANISM OF TYPICAL TUBE BURST POSITION OF BOILER UNDER DEEP PEAK SHAVING

作　　者：任福虎 乔永茂 郭秋实 于伟强 樊利军 Ren Fuhu;Qiao Yongmao;Guo Qiushi;Yu Weiqiang;Fan Lijun(Inner Mongolia Datang International Toketo Power Generation Co.,Ltd.,Hohhot,Inner Mongolia,010206)

机构地区：[1]内蒙古大唐国际托克托发电有限责任公司,内蒙古呼和浩特010206

出　　处：《石油化工设备技术》2024年第6期12-17,I0001,共7页Petrochemical Equipment Technology

基　　金：大唐国际发电股份有限公司(批准号:DTJJ-2023-20249)资助的课题。

摘　　要：某火电厂DG-2070/17.5-Ⅱ4型锅炉近些年在运行时,水冷壁多处常常发生拉裂现象,为此,文章以深度调峰工况下锅炉水冷壁与包墙过热器交接处的典型爆管位置为研究对象,建立有限元分析模型,分析了不同升温速率和炉内最终温度对典型爆管位置的热应力和变形影响。结果表明:明显的温度过渡区域和应力集中点是管道损伤的主要区域;更高的炉内最终温度是导致T形口出现损伤的主要原因,升温速率对结构损伤的影响相对有限。根据上述研究结果,建议降低T形口处水冷壁弯管和包墙变径管处的不连续性并优化鳍片与管道的连接方式,以降低管道流致振动带来的影响,避免爆管发生。In recent years,frequent cracking has occurred in the water walls of DG-2070/17.5-II4 type boilers during operation in a thermal power plant.This study focuses on the typical tube burst positions at the junction between the boiler water wall and the enclosure wall superheater under deep peak shaving.The finite element analysis models are established to evaluate the effects of different heating rates and the final temperature inside the boiler on the thermal stress and deformation at these typical tube burst positions.The results indicate that obvious thermal transition zones and stress concentration points are the primary causes of tube damage.The higher final temperature inside the boiler is the main factor leading to damage at the T-junction,while the influence of the heating rate on structural damage is relatively limited.Based on the results of the above study,it is recommended that the discontinuities at the T-junction should be reduced and the connection method of fins and tubes should be optimized,thereby mitigating the impact of flow-induced vibration and preventing tube burst.

关 键 词：爆管 失效分析 流固热耦合 水冷壁 包墙过热器 鳍片 

分 类 号：TM621.2[电气工程—电力系统及自动化]