300MW亚临界锅炉低负荷水动力特性研究  

Study on Hydrodynamic Characteristics of a 300MW Subcritical Boiler at Low-load

作　　者：孟强 王承亮 李洪涛 高鹏 王玉敬 吕为智 Meng Qiang;Wang Chengliang;Li Hongtao;Gao Peng;Wang Yujing;LüWeizhi(CHD Zouxian Power Plant,Zoucheng 273522,Shandong Province,China;CHD Technology Service Company,Jinan 250001,China;Shanghai Power Equipment Research Institute Co.,Ltd.,Shanghai 200240,China)

机构地区：[1]华电国际邹县发电厂,山东邹城273522 [2]华电国际技术服务公司,济南250001 [3]上海发电设备成套设计研究院有限责任公司,上海200240

出　　处：《发电设备》2021年第4期231-235,共5页Power Equipment

摘　　要：以某300 MW亚临界自然循环锅炉为研究对象,构建由流量回路、压力节点和连接管组成的流动网络系统,并根据质量、动量和能量守恒方程,建立水冷壁流量和壁温计算数学模型,对低负荷下的水动力特性进行研究。结果表明:20%和30%额定负荷下锅炉的循环倍率均大于界限循环倍率,不同负荷下各回路的流量分配呈现中间高、两头低的趋势,热负荷越大的回路其相应的质量流速越大,在正常低负荷运行工况下不会发生停滞现象,能够保证机组的水动力安全性。A 300 MW natural circulation boiler was taken as the research object to build the flow network system,which composed of flow loop,pressure node and connecting pipe.Based on the conservation equations of mass,momentum and energy,the mathematical model of water wall flow rate and wall temperature was established to study the hydrodynamic characteristics under low load.The results shown that,under 20%and 30%load conditions,the circulation ratio is larger than the limit circulation ratio.The mass flux distribution and circulation flow rate in the boiler water wall are distributed with higher in the middle and lower in the ends.The larger the heat load is,the larger the corresponding mass flow rate is,and the stagnation phenomenon will not occur under normal low load operation conditions,which can ensure the hydrodynamic safety of the unit.

关 键 词：亚临界机组 低负荷 水动力 循环倍率 

分 类 号：TK224.2[动力工程及工程热物理—动力机械及工程]