热力发电2025，Vol.54Issue(12)：1-8,8.DOI:10.19666/j.rlfd.202506096
循环流化床锅炉变负荷特性研究
Investigation on load change characteristics of circulating fluidized bed boilers
摘要
Abstract
Improving the flexibility of coal-fired power generation units is of great significance for ensuring the reliable and stable operation of the power grid.The heat and mass transfer process in the CFB boiler furnace is investigated deeply.It is found that when the load changes,the air volume entering the furnace responds rapidly,driving the change of the particle suspension density in the dilute phase zone,thus triggers the rapid change of the convective heat transfer coefficient and the total heat flux.Different from pulverized coal-fired boilers,the average furnace temperature of the CFB boiler changes little with load.During the load change process,although the heat storage capacity is large,the thermal inertia is not fully manifested,and it does not have a negative impact on the load change rate.Therefore,the load adjustment process of the CFB boiler is based on the rapid response of the heat transfer coefficient under near constant temperature conditions,which is essentially different from the load-changing mechanism of the pulverized coal-fired boiler.In addition,a considerable amount of unburned carbon in the bed material can serve as a potential fuel supply source when the load increases.When the oxygen supply is increased,the combustion rate can be rapidly improved.Combined with the heat storage of bed materials and castable,the CFB boiler can be regarded as having a built-in"energy storage"function,providing long-term energy support for load adjustment.Measures such as reducing the average bed material size,decreasing the feeding coal size,and adding powdered-coal and circulating ash can further increase the load-changing rate of the CFB boiler.The test results on a 300 MW subcritical CFB boiler unit show that the load increasing and decreasing rate can reach 4%～9%Pe/min,approaching the load-changing capability of a gas turbine unit.The research demonstrates that the CFB boiler has the potential for rapid load change in principle and will play a more crucial role in the new power system dominated by renewable energy sources.关键词
循环流化床锅炉/快速变负荷/蓄热/对流传热/工程实践Key words
circulating fluidized bed boiler/fast load change/energy storage/convective heat transfer/engineering practice引用本文复制引用
NIE Hao,KE Xiwei,LIU Chengliang,HUANG Zhong,WEI Shaoqing,XU Chengxing,WANG Junfeng,LYU Junfu,YUE Guangxi..循环流化床锅炉变负荷特性研究[J].热力发电,2025,54(12):1-8,8.基金项目
"十四五"国家重点研发计划项目(2022YFB4100301)Key Research and Development Project of the National 14th Five-Year-Plan(2022YFB4100301) （2022YFB4100301）
