W火焰炉水冷壁管拉裂原因多物理场耦合数值模拟研究  

Numerical simulation study to the causes of water wall tube cracking in W-flame furnace based on multi-physics field coupling

作　　者：殷金桥 钱进[2] 邓传记 杨柳 罗义 YIN Jinqiao;QIAN Jin;DENG Chuanji;YANG Liu;LUO Yi(China Aerospace Science and Industry Corporation Tenth Research Institute Guizhou Aerospace Electric Co.,Ltd.,Guiyang 550025,China;College of Electrical Engineering,Guizhou University,Guiyang 550025,China;State Power Investment Group Guizhou Jinyuan Chayuan Power Generation Co.,Ltd.,Bijie 551700,Guizhou,China;School of Big Data and Computer Science,Guizhou Normal University,Guiyang 550025,China)

机构地区：[1]中国航天科工集团第十研究院贵州航天电器股份有限公司,贵阳550025 [2]贵州大学电气工程学院,贵阳550025 [3]国家电投集团贵州金元茶园发电有限责任公司,贵州毕节551700 [4]贵州师范大学大数据与计算机科学学院,贵阳550025

出　　处：《智能计算机与应用》2024年第10期114-119,共6页Intelligent Computer and Applications

基　　金：贵州省科技支撑计划项目(20202Y040);国家电投集团贵州金元茶园发电有限责任公司科技项目(CPCEC-ZCB-13-2022-16-11)。

摘　　要：自参与深度调峰以来,贵州省内某发电企业超临界W火焰直流炉水冷壁拉裂故障频发,使机组非计划停机数大幅增加。本文基于数值模拟的方法,建立前述锅炉易发生拉裂部位的局部管屏三维模型,开展多物理场耦合数值模拟研究,求解该模型的管屏在BMCR和40%BMCR两种工况下的最大温度、热应力及最大剪切应力分布和最大变形量,并对比分析模拟结果与现场情况,得出管屏第423管背火侧焊缝处易产生拉裂的原因主要是热应力集中在该部位导致纵向裂纹扩展到焊缝处,以及该部位水冷壁管垂直方向相反的剪切应力最大且对管材具有撕扯作用,在多次深调运行中累加致使焊缝处发生拉裂故障。形成的结论可为机组运行调整和预防性检修策略提供参考。Since participating in deep peak shaving,water wall cracking faults have occurred frequently in a supercritical W-flame DC boiler of a power generation enterprise in Guizhou,resulting in a significant increase in unplanned shutdowns of the units.This article is based on numerical simulation methods to establish a local three-dimensional model of the boiler screen that is prone to cracking.Multiple physical field coupling numerical simulation research is carried out to solve the maximum temperature,thermal stress,maximum shear stress distribution,and maximum deformation of the pipe screen in the BMCR and 40%BMCR working conditions of the model.The simulation results are compared and analyzed with the on-site situation.It is found that the main reason for cracking at the back fire side weld of the 423rd pipe screen is that thermal stress is concentrated in this area,causing longitudinal cracks to expand to the weld,and the maximum shear stress in the opposite vertical direction of the water-cooled wall pipe in this area,which has a tearing effect on the pipe material.In multiple deep adjustment operations,cracking failure at the weld seam is accumulated and caused.The conclusions can provide reference for unit operation adjustment and preventive maintenance strategies.

关 键 词：数值模拟 W火焰锅炉 水冷壁拉裂 热应力 剪切应力 

分 类 号：TM621.2[电气工程—电力系统及自动化]