电力科技与环保2026，Vol.42Issue(1)：44-53,10.DOI:10.19944/j.eptep.1674-8069.2026.01.005
350 MW全燃准东煤锅炉钠迁移数值模拟研究
Numerical simulation study of sodium migration in 350 MW fully-fired Zhundong coal boiler
摘要
Abstract
[Objective]The high alkali metal content in Zhundong coal leads to severe fouling and corrosion on boiler heating surfaces,hindering its large-scale,efficient utilization.To reveal its migration and transformation patterns in large-scale pulverized coal boilers and provide a theoretical basis for optimizing anti-fouling operations,this study delves into the migration characteristics of alkali sodium.[Methods]A full-scale numerical model of a 350 MW tangentially fired boiler burning high-alkali coal was developed by coupling a sodium release and transformation model with a computational fluid dynamics(CFD)combustion model.This model was employed to simulate the formation,distribution,and transformation of the key fouling agents,NaCl and Na2SO4.[Results]The results indicate that NaCl and Na2SO4 exhibit distinct spatial distributions.Sodium is primarily released as NaCl during the initial stage of combustion,concentrating in the core combustion zone of the lower and middle furnace.Conversely,Na2SO4 is mainly formed from the transformation of sodium species in the upper furnace.Increasing the excess air ratio enhances the oxidizing atmosphere,accelerating the conversion of NaCl to Na2SO4,which decreases the mole fraction of NaCl in the flue gas from 1.57×10-5 to 6.61×10-6.However,this also intensifies char combustion and promotes further sodium release from the coal matrix,leading to an increase in the Na2SO4 mole fraction from 2.45×10-5 to 2.59×10-5.Consequently,the total emission rate of gaseous sodium rises from 0.020 45 kg/s to 0.020 94 kg/s.[Conclusion]When increasing the excess air coefficient to optimize combustion efficiency,a critical trade-off must be considered.The benefits must be balanced against the enhanced migration of alkali metals into the gas phase to avoid exacerbating the fouling and corrosion risks on downstream heating surfaces.关键词
准东煤/高碱煤/钠迁移/数值模拟/沾污Key words
Zhundong coal/high-alkali coal/sodium migration/numerical simulation/fouling分类
能源科技引用本文复制引用
张柏华,宋瀚文,林晓伟,周冠文,李元鲁..350 MW全燃准东煤锅炉钠迁移数值模拟研究[J].电力科技与环保,2026,42(1):44-53,10.基金项目
江苏省碳达峰碳中和科技创新专项资金项目(BE2023854) （BE2023854）
