基于CFD的燃煤锅炉末级过热器壁温分布特性研究  

Study on Tube Metal Temperature Distribution Characteristics of Final Superheater of Coal-Fired Boiler Based on CFD

作　　者：朱笔文 司风琪[1] 董云山 ZHU Biwen;SI Fengqi;DONG Yunshan(Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education,Southeast University,Nanjing210096,China;School of Energy and Power,Jiangsu University of Science and Technology,Zhenjiang 212000,China)

机构地区：[1]东南大学能源热转换及其过程测控教育部重点实验室,江苏南京210096 [2]江苏科技大学能源与动力学院,江苏镇江212000

出　　处：《锅炉技术》2024年第4期13-20,共8页Boiler Technology

摘　　要：针对燃煤锅炉高温受热面易发生超温和爆管事故的问题,综合考虑炉内烟气侧与管内蒸汽侧对受热面管壁温度的影响,基于数值模拟的方法简化了炉内煤粉气流的燃烧过程并构建了炉内烟—汽耦合换热模型,实现了对末级过热器沿程壁温的快速计算。在此基础上,探究了不同工况下该级受热面壁温分布特点及壁温峰值位置变化规律等。结果表明:受管外烟气与管内蒸汽的耦合影响,末级过热器沿程壁温基本呈双峰分布;随着负荷上升,烟道内不同管屏的沿程壁温分布曲线差异变小,烟道两侧管屏壁温峰值位置出现不同程度的下移。In order to solve the problem that the high-temperature heating surface in a coal-fired boiler is prone to overtemperature and tube explosion accidents,the influence of the flue gas side and the steam side on the tube metal temperature of the heating surface are comprehensively considered.Based on the numerical simulation method,the combustion process of the pulverized coal flow in the furnace is simplified and the coupled gas and steam heat transfer model in the furnace is constructed,which realizes the rapid calculation of the tube metal temperature of the final superheater.On this basis,the characteristics of tube metal temperature distribution and the variation of peak metal temperature position under different working conditions are investigated.Results show that the metal temperature distribution of the final superheater along the way is basically bimodal due to the coupling of flue gas outside the tube and steam inside the tube.With the increase in load,the difference of the metal temperature distribution curves along the way of different pipe panels in the flue gas duct become smaller,and the peak positions of the metal temperature on both sides of the flue gas duct shift downard to different degrees.

关 键 词：燃煤锅炉 数值模拟 高温受热面 壁温计算 

分 类 号：TK224[动力工程及工程热物理—动力机械及工程]