广东电力2025，Vol.38Issue(12)：114-120,7.DOI:10.3969/j.issn.1007-290X.2025.12.011
660 MW燃煤锅炉低负荷稳燃特性数值模拟
Numerical Simulation of Low-load Combustion Stability Characteristics for 660 MW Coal-fired Boiler
摘要
Abstract
The low-load combustion stability of the coal-fired boilers is crucial to evaluate their flexible operation performance.To enhance the stable combustion characteristics under low-load conditions,this study focuses on a 660 MW tangential coal-fired boiler using numerical simulation methods to analyze the impact of different low-load levels and the number of operating coal mills on boiler combustion stability based on indicators such as the volume-averaged temperature in the main combustion zone,ignition distance,and combustion stability coefficient.And then it proposes the low-load stable combustion strategies.The findings indicate that the simulation values align well with experimental data,confirming the rationality of the adopted meshing and mathematical model.With the same number of operating coal mills,as the load decreases under low-load conditions,the ignition distance increases significantly,the averaged temperature of the volume gradually declines and the combustion stability coefficient decreases.At the same load level,as the number of operating coal mills decreases,the power distribution becomes more concentrated,the ignition distance shortens progressively,the volume averaged temperature rises and the combustion stability coefficient improves.When operating with four coal mills,the rate of decline in the combustion stability coefficient when reducing the load from 35％to 30％of rated capacity is approximately 3.16 times that of reducing from 100％to 35％of rated capacity,posing a risk of combustion instability.This aligns with the actual minimum stable combustion load of 35％for this boiler.At 30％of rated load,operating with three and two coal mills yields combustion stability coefficients of 0.797 and 0.839 respectively,both higher than the coefficient of 0.791 observed when operating with four coal mills at 35％of rated load.This demonstrates that reducing the number of operating coal mills allows the boiler to achieve a minimum stable combustion load of 30％of rated capacity.关键词
燃煤锅炉/低负荷/燃烧稳定性/数值模拟/磨煤机数量Key words
coal-fired boiler/low load/combustion stability/numerical simulation/numbers of coal mills分类
信息技术与安全科学引用本文复制引用
江少辉,潘洪鹏,黄浩,刘宇浓,方庆艳,陈刚..660 MW燃煤锅炉低负荷稳燃特性数值模拟[J].广东电力,2025,38(12):114-120,7.基金项目
国家重点研发计划项目(2022YFB4100402) （2022YFB4100402）
