超临界锅炉水冷壁壁温预测耦合模型  

Coupled model for prediction of water wall tube temperature of supercritical boiler

作　　者：闫靖文 刘欣 黄书益 岳琳 李驰 李新颖 魏佳 付静 李文甲 王赫阳 YAN Jingwen;LIU Xin;HUANG Shuyi;YUE Lin;LI Chi;LI Xinying;WEI Jia;FU Jing;LI Wenjia;WANG Heyang(School of Mechanical Engineering,Tianjin University,Tianjin 300072,China;Yantai Longyuan Power Technology Co.,Ltd.,Yantai 264006,China;CHN Energy,Ledong Power Generation Co.,Ltd.,Ledong Li Autonomous County 572539,China)

机构地区：[1]天津大学机械工程学院,天津300072 [2]烟台龙源电力技术股份有限公司,山东烟台264006 [3]国家能源集团乐东发电有限公司,海南乐东黎族自治县572539

出　　处：《热力发电》2022年第1期100-108,共9页Thermal Power Generation

基　　金：国家自然科学基金青年科学基金项目(51906176)。

摘　　要：近年来可再生能源发电的迅速增长和低氮燃烧技术的广泛应用,加剧了燃煤锅炉水冷壁的超温和高温腐蚀趋势,导致爆管事故频发。预防水冷壁爆管需掌握不同锅炉运行参数下水冷壁的管壁温度分布,为此提出了一种锅炉烟气侧三维计算流体动力学模型与工质侧一维水动力模型耦合的传热计算模型,通过二模型间壁面热流密度和管内工质温度的数据交互,将烟气侧传热和管内工质温度对管壁温度的关键影响同时考虑在计算中,实现了水冷壁壁温分布的精确预测。采用此耦合模型对某超临界350 MW机组螺旋管圈水冷壁的工质温度与管壁温度分布特性进行数值模拟研究,水冷壁出口壁温预测结果与测量结果符合良好,验证了模型的准确性。With the quick increase of renewable energy power generation and extensive application of low NOx combustion technologies,the overheating and high temperature corrosion of water wall of coal-fired boilers dramatically aggravated,leading to frequent tube leak accidents.In order to prevent these accidents,it is critical to master the tube wall temperature distribution characteristics of the boiler with different operating parameters.For this reason,a coupled heat transfer model that integrates the three-dimensional CFD model of the gas side of boiler with the one-dimensional hydrodynamic model of the steam side was proposed.The coupled heat transfer calculation between the gas and steam sides of boiler was realized through the data exchange of wall heat flux and steam temperature between the two models.In this way,the crucial effects of gas side heat transfer and steam temperature on the tube temperature were both considered in the calculation,and thereby,realizing the accurate prediction of temperature distribution of water wall tubes.This coupled model was used to simulate the distributions of the steam and wall tube temperature of the spiral water wall of a 350 MW supercritical boiler.The predicted results of the tube temperatures at the outlet of the spiral wall were in good agreement with the measured values verifying the accuracy of the model,indicating the accuracy of the model.

关 键 词：水冷壁 管壁温度 耦合传热模型 超临界锅炉 

分 类 号：TK229.2[动力工程及工程热物理—动力机械及工程]