超临界循环流化床锅炉水冷壁吸热偏差计算及深度调峰水动力特性  

Hydrodynamic Characteristics of Deep Peak Shaving and Calculation of Water Wall Thermal Deviation of Supercritical Circulating Fluidized Bed Boiler

作　　者：张西容 宋园园 周妍君 吕俊复[2] 黄中 杨冬[1] ZHANG Xirong;SONG Yuanyuan;ZHOU Yanjun;LYU Junfu;HUANG Zhong;YANG Dong(State Key Laboratory of Multiphase Flow in Power Engineering(Xi’an Jiaotong University),Xi’an 710049,Shaanxi Province,China;Key Laboratory of Thermal Science and Power Engineering of Ministry of Education(Tsinghua University),Haidian District,Beijing 100091,China)

机构地区：[1]动力工程多相流国家重点实验室(西安交通大学),陕西省西安市710049 [2]热科学与动力工程教育部重点实验室(清华大学),北京市海淀区100091

出　　处：《中国电机工程学报》2024年第15期6047-6056,I0017,共11页Proceedings of the CSEE

基　　金：国家重点研发计划项目(2022YFB4100303)。

摘　　要：超临界循环流化床锅炉在深度调峰过程中受热负荷及质量流速变化的影响容易出现管壁拉裂、超温爆管等安全问题,故有必要对锅炉深度调峰负荷时热偏差系数、水动力特性进行计算研究。该文根据超临界循环流化床锅炉水冷壁及水冷屏结构,建立水动力计算数学模型并运用实炉测量数据计算实炉热偏差系数,对310及110MW负荷实炉热偏差系数进行计算,并采用110MW负荷实炉热偏差系数对120及70MW(深度调峰负荷)的水动力进行计算,将120MW负荷时的出口汽温计算结果与实炉测量数据进行对比验证,对70MW深度调峰负荷水动力计算结果进行分析。结果表明:循环流化床锅炉高低负荷时热偏差系数分布规律不同,在相近负荷时炉膛热偏差系数呈现出一致性,并且锅炉在70MW深度调峰负荷时,锅炉能安全稳定运行。深度调峰负荷时循环流化床锅炉吸热偏差系数及水动力特性的计算研究,为现有火电机组进行灵活性深度调峰优化改造提供一定的理论基础。It is necessary to calculate the thermal deviation coefficient and hydrodynamic characteristics of supercritical circulating fluidized bed boilers during deep peak shaving load to address issues such as tube wall cracking and over-temperature tube bursting caused by fluctuations in load and mass flow rate.A mathematical model for hydrodynamic calculation is established based on the water wall and water platen structure of the boiler,and the real furnace thermal deviation coefficient is computed using measurement data.The thermal deviation coefficients are calculated for 310 and 110 MW loads,while the hydrodynamic calculation is performed at 120 and 70 MW deep peak shaving loads.The results of the output steam temperature calculation at 120 MW load are verified against the measurement data and the hydrodynamic calculation at the 70 MW deep peak shaving load is examined.The calculation demonstrates that the thermal deviation coefficients of circulating fluidized bed boilers vary depending on the load,but remain consistent at similar loads.The boiler operation is secure and stable at 70 MW deep peak shaving load.The numerical research on the thermal deviation coefficients and hydrodynamic characteristics of circulating fluidized bed boilers under deep peak shaving load provides theoretical support for the flexible deep peak shaving optimization transformation of existing thermal power units.

关 键 词：超临界循环流化床锅炉 热偏差系数 深度调峰 水动力特性 实炉数据 

分 类 号：TM621.2[电气工程—电力系统及自动化]