超超临界二次再热尾部三烟道锅炉汽温动态特性及协同优化控制  

Dynamic Characteristics and Coordinate Control Optimization of Steam Temperatures for an Ultra-supercritical Double-reheat Boiler with Three Rear Ducts

作　　者：叶青 王朝阳[2] 易广宙 马召召 刘明[2] 严俊杰[2] YE Qing;WANG Chaoyang;YI Guangzhou;MA Zhaozhao;LIU Ming;YAN Junjie(CHN Energy Bengbu Power Generation Co.,Ltd.,Bengbu 233000,Anhui Province,China;State Key Laboratory of Multiphase Flow in Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China;Dongfang Boiler Co.,Ltd.,Chengdu 611731,China)

机构地区：[1]国能蚌埠发电有限公司,安徽蚌埠233000 [2]西安交通大学动力工程多相流国家重点实验室,西安710049 [3]东方电气集团东方锅炉股份有限公司,成都611731

出　　处：《动力工程学报》2023年第2期117-125,184,共10页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(52106026);中国博士后科学基金资助项目(2020M683475);华能国际电力股份有限公司科技资助项目(HNKJ21-H71)。

摘　　要：为提高660 MW超(超)临界二次再热尾部三烟道锅炉在变负荷过程中蒸汽温度的控制精度,保障锅炉瞬态运行安全,建立了锅炉动态模型,研究获得了尾部烟气挡板开度变化后锅炉主、再热蒸汽温度的动态特性,据此提出了主、再热蒸汽温度协同的挡板调温控制策略,并将其与锅炉动态模型耦合。然后研究了锅炉在50%~100%锅炉最大连续蒸发量(BMCR)范围内变负荷时,分别采用原始控制逻辑及考虑主、再热蒸汽温度协同控制逻辑后蒸汽温度的变化规律。结果表明:采用主、再热蒸汽温度协同控制逻辑后,控制精度明显改善,变负荷瞬态过程中的蒸汽温度波动幅度降低;升、降负荷过程中蒸汽温度累积偏差最大分别降低了40.9%和15.7%。To improve the steam temperature control accuracy of a 660 MW ultra-supercritical(supercritical) double-reheat boiler with three rear ducts and ensure its operation safety during the transient operation processes,based on dynamic model,the dynamic characteristics of the main and reheat steam temperatures of the boiler were studied and obtained after changing the opening of the baffles fixed in the rear flue gas ducts.Then an adjustment control strategy of the baffles with synergistic main and reheat steam temperatures was proposed and coupled with the boiler dynamic model.The control effects of the original logic and the synergistic logic considering the main and reheat steam temperatures on the steam temperatures were studied when the load changed in the range of 50%-100% boiler maximum continuous rating(BMCR).Results show that after adopting the logic considering the coordination of the main and reheat steam temperatures,the control accuracy is significantly improved,and the steam temperature fluctuation during the transient operation processes is reduced.The cumulative deviation of steam temperatures decreases by 40.9% and 15.7% respectively during the loading up and down processes.

关 键 词：二次再热 蒸汽温度 协同控制 尾部三烟道锅炉 动态特性 挡板调温 

分 类 号：TM621[电气工程—电力系统及自动化]