中国电机工程学报2025，Vol.45Issue(19)：7622-7633,中插38,13.DOI:10.13334/j.0258-8013.pcsee.240880
燃煤锅炉低负荷下燃烧与汽水侧耦合模拟研究
Coupling Simulation Study on Combustion and Steam-water Side in a Coal-fired Boiler Under Low Load
摘要
Abstract
When coal-fired boiler units participate in deep peak shaving,the water wall temperature and the characteristics of the working fluid in the tube are crucial for the safe and stable operation of the boiler under low load.Therefore,this paper uses bidirectional iteration strategies based on Fluent and user-defined functions(UDFs)to conduct a coupled simulation of combustion and steam-water side in a 1 000 MW double tangential-fired boiler under low load.This study explores the influence of air distribution mode and coal mill combination mode on the heat flux,working fluid temperature,heat transfer coefficient,and water wall temperature.The results indicate that the simulated values of the oxygen content,carbon content in fly ash,water-wall temperature,and working fluid temperature are consistent with the on-site measurement,and the coupled simulation results are reliable.The carbon content in fly ash is the lowest with waist reduction and equal air distribution methods.With inverted tower air distribution,the outlet temperature of the working fluid in the tube is the highest,followed by the main tower and the waist contraction,while the equal is the lowest.The water wall temperature gradually increases along the height with equal and waist-reduced air distribution.In contrast,the temperature of the lower wall with inverted tower air distribution is higher,and the range of high-temperature zones is wider.When ABC or BCD mills are applied,the temperature distribution inside the furnace is relatively uniform,and the carbon content in fly ash is relatively low(ABC:1.03％,BCD:1.26％).Under the ABC mills,the temperature of the working fluid inside the tube increases the fastest and reaches the highest,while under the DEF mills,the temperature of the working fluid inside the pipe increases most slowly and reaches the lowest maxinum.The wall temperature of the DEF mills is significantly reduced compared to the combination of ABC mills and BCD mills.The studied results can provide practical guidance for low-load,efficient,safe,and stable operation of boilers.关键词
低负荷/耦合模拟/燃烧侧/汽水Key words
low load/coupled simulation/combustion/steam-water分类
能源科技引用本文复制引用
马启磊,彭志福,姚杨,马仑,陈曦,韩磊,方庆艳,陈刚..燃煤锅炉低负荷下燃烧与汽水侧耦合模拟研究[J].中国电机工程学报,2025,45(19):7622-7633,中插38,13.基金项目
国家重点研发计划项目(2022YFB4100402).National Key R&D Program of China(2022YFB4100402). （2022YFB4100402）
