摘要
循环流化床(circulating fluidized bed,CFB)锅炉具有热惯性大、蓄热能力强的特点,可以实现近零出力的压火调峰。然而,目前业内对于大型CFB机组压火调峰相关试验研究较少,缺乏压火调峰期间关键参数变化和相关控制策略的研究。对此,以某350 MW超临界CFB锅炉为对象,完成了压火调峰试验,研究了机组压火期间重要参数变化规律,提出了锅炉给水流量和汽轮机综合阀位控制策略优化方案,旨在保障机组运行安全性的前提下最大化压火调峰时间。试验结果表明:优化后超临界CFB机组可以实现85 min机组负荷5~8 MW的压火调峰;试验期间锅炉全程维持干态运行,主、再热蒸汽温度从566.0、553.0℃下降至482.0、472.0℃,平均下降速率为0.99、0.95℃/min;锅炉平均床温从875.8℃下降至730.9℃,平均下降速率为1.70℃/min;试验过程中,高压缸排汽温度最高为380.0℃,调节级蒸汽温度高于内缸内壁温度,锅炉水冷壁及水冷中隔墙出口壁温偏差随压火时间逐渐减小,最高为97.5℃。研究结果证明了超临界CFB机组小时级压火调峰的可行性,可为同类型机组的工程实践提供参考。
Circulating fluidized bed(CFB)boilers are characterized by high thermal inertia and strong heat storage capacity,enabling banked fire and near-zero output peak shaving.However,there is limited experimental research on banked fire and peak regulation in large-scale CFB units,with a lack of studies on key parameter variations and control strategies during this process.In this study,a banked fire and peak regulation test was conducted on a supercritical 350 MW CFB boiler to investigate the evolution of critical parameters during shutdown and propose optimization strategies for boiler feedwater flow rate and integrated turbine valve position control. These optimizations aim to maximize the peak shaving duration while ensuring operational safety.Experimental results demonstrate that the optimized supercritical CFB unit achieved 85 minutes of shutdown peakregulation with a load of 5~8 MW. Throughout the test, the boiler maintained dry operation, while the main andreheat steam temperatures decreased from 566.0 ℃ and 553.0 ℃ to 482.0 ℃ and 472.0 ℃, with averagecooling rates of 0.99 ℃/min and 0.95 ℃/min, respectively. The average bed temperature declined from 875.8 ℃to 730.9 ℃ at a rate of 1.70 ℃/min. During the test, the maximum exhaust temperature of the high-pressurecylinder reached 380.0 ℃, with the steam temperature at the regulating stage exceeding that of the cylinder innerwall. The wall temperature deviation at the outlet of the boiler water-cooled walls and mid-partition wallsgradually decreased, peaking at 97.5 ℃. These findings confirm the feasibility of hour-level shutdown peakregulation in supercritical CFB units and provide a reference for engineering applications of similar units.
作者
佟博恒
李玉
马乐乐
许永伟
赵彬彬
杨军
杨雪婷
李金晶
程亮
黄中
吕俊复
TONG Boheng;LI Yu;MA Lele;XU Yongwei;ZHAO Binbin;YANG Jun;YANG Xueting;LI Jinjing;CHENG Liang;HUANG Zhong;LYU Junfu(North China Electric Power Research Institute Co.,Ltd.,Beijing 100045,China;Jijian Investment Shouyang Thermal Power Co.,Ltd.,Jinzhong 045400,China;Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China)
出处
《热力发电》
北大核心
2025年第7期82-90,共9页
Thermal Power Generation
基金
国家重点研发计划项目(2022YFB4100303-3)。
关键词
超临界
循环流化床锅炉
压火调峰
干态运行
床温
supercritical
circulating fluidized bed boiler
banked fire and peak regulation
dry operation
bed temperature
