摘要
水动力特性及流动不稳定性的准确计算和分析,对660MW超超临界CFB锅炉水冷壁的优化设计和安全运行具有重要意义。针对我国自主开发的660 MW超超临界CFB锅炉设计方案,将其水冷壁系统等效为由流量回路、压力节点和连接管组成的流动网络系统,根据质量守恒、能量守恒和动量守恒方程建立了水动力计算数学模型,在此基础上对其4个负荷下的水动力特性进行了计算分析。同时建立了适用于超超临界锅炉流动不稳定性计算分析的一维单通道通用数值计算模型,选取25%锅炉最大连续出力(boiler maximum continue rate,BMCR)负荷下的危险回路进行了流动不稳定性的计算分析。计算结果表明,超超临界CFB锅炉水冷壁系统的总压降低于煤粉炉的压降;水冷壁流量分配呈正响应特性,4个负荷下最大的流量偏差为20.98%;最大的出口工质温度偏差出现在后墙,为8.4℃;各负荷下的壁温均处于管子材料的允许温度范围之内,不会出现高温爆管的现象;水冷壁不会发生流动不稳定性,锅炉的运行是安全可靠的。
The accurate calculation and analysis of hydrodynamic characteristics and flow instability are of great significance for the optimal design and safe operation of the water-cooled wall of a 660 MW ultra-supercritical CFB boiler.Based on the flow network system method and the conservation equations of mass,energy and momentum,the mathematical model of thermal-hydraulic calculation was established and the thermal-hydraulic characteristics of 660 MW high-efficiency ultra-supercritical circulating fluidized bed boiler developed by China at four loads were calculated and analyzed with this model.At the same time,a onedimensional single-channel universal numerical calculation model for flow instability analysis of ultra-supercritical boilers was established and the calculation and analysis of flow instability for the dangerous circuit was carried out.The results show that the total system pressure of the water wall of the ultra-supercritical CFB boiler is lower than that of the traditional pulverized coal furnace;positive flow characteristics are observed in the water wall and the maximum flow deviation among the four loads is 20.98%;the maximum outlet fluid temperature deviation is 8.4℃,occurring on the rear wall;the metal temperature of the water wall at four loads are both permissible;the water wall will not flow instability and the operation of the boiler is safe and reliable.
作者
董乐
辛亚飞
李娟
杨冬
姜孝国
王刚
DONG Le;XIN Yafei;LI Juan;YANG Dong;JIANG Xiaoguo;WANG Gang(State Key Laboratory of Multiphase Flow in Power Engineering(Xi’an Jiaotong University),Xi’an 710049,Shaanxi Province,China;State Key Laboratory of Efficient and Clean Coal-fired Utility Boilers(Harbin Boiler Company Limited),Harbin 150046,Heilongjiang Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2020年第5期1545-1554,共10页
Proceedings of the CSEE
基金
国家重点研发计划项目(2016YFB0600201).
关键词
660
MW
超超临界
循环流化床
水动力特性
流动不稳定性
660MW
ultra-supercritical
circulating fluidized bed(CFB)
thermal-hydraulic
flow instability
作者简介
董乐(1994),男,硕士研究生,主要从事多相流流动及传热计算,锅炉水动力研究的工作,479160472@qq.com;通信作者:杨冬(1967),男,工学博士,教授,博士生导师,主要从事多相流与传热,超(超)临界锅炉水动力等方面的研究工作,dyang@mail.xjtu.edu.cn。
