煤炭转化2025，Vol.48Issue(5)：3-12,10.DOI:10.19726/j.cnki.ebcc.202505001
耦合太阳能储热的CFB机组长周期近零出力运行特性研究
Investigation on long-period near-zero load operation characteristics of CFB power plants coupled with thermal energy storage
摘要
Abstract
CFB banked-fire hot-standby technology is an extremely deep peaking technology that can achieve near-zero power output.However,due to the limitation of steam parameters during banked-fire operation,the safe operation time of steam turbine can be maintained only about 1 h-2 h.To address the above issues,a long-period banked-fire technology scheme for CFB power plants coupled with thermal storage has been proposed.During banked fire operation,high-parameter regenerative steam generated through solar-thermal integration synergistically maintains turbine operation with boiler primary steam,thereby breaking through the duration limitations of conventional CFB units in banked fire conditions.To explore operation characteristics of the above unit,a thermodynamic system model of the unit was established using the EBSILON,obtaining key operational parameters under main steam flow rates ranging from 20 t/h to 40 t/h.An exergy analysis model was established to reveal exergy destruction distribution patterns in CFB units under ultra-low load conditions,with quantitative evaluation of exergy performance indicators for critical components.Results demonstrate that the unit achieves a minimum output of 3.3 MW during banked fire operation,realizing near-zero external power output after deducting auxiliary power consumption.Exergy analysis reveals that both exergy destruction and exergy efficiency of key components exhibit increasing trends with rising main steam flow rates.The feedwater heater demonstrates superior exergy efficiency exceeding 93%,while the high-pressure(HP)turbine shows relatively low efficiency of approximately 50%.Component exergy destruction rates follow this descending order from high to low:condenser,steam turbine,molten salt-water heat exchanger,feedwater heater.关键词
循环流化床/灵活调峰/近零出力/火用分析/模拟Key words
circulating fluidized bed/deep peak regulation/near-zero output/exergy analysis/simulation分类
能源科技引用本文复制引用
韩佩兴,冯浩,钟旭东,郭俊菲,王兴,黄中,柯希玮..耦合太阳能储热的CFB机组长周期近零出力运行特性研究[J].煤炭转化,2025,48(5):3-12,10.基金项目
中国科协青年人才托举工程项目(2024-2026QNRC001). （2024-2026QNRC001）
