超临界锅炉螺旋水冷壁流量分配和壁温特性的研究  

Study of the Flow Rate Distribution and Wall Temperature Characteristics of the Spirally-coiled Tube Water Wall in a Supercritical Boiler

作　　者：王为术[1] 郭会军 上官闪闪 徐维晖[1] 

机构地区：[1]华北水利水电大学热能工程研究中心,河南郑州450011 [2]河北电力勘测设计研究院上海分院,河北石家庄050000

出　　处：《热能动力工程》2016年第1期59-65,132-133,共7页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金资助项目(51406026);河南省高校科技创新人才支持计划项目(2012HASTIT018)

摘　　要：基于流体管网计算理论,建立了由流量测量回路(以下简称流量回路)、压力测量节点和连接管构成的600MW超临界锅炉螺旋水冷壁流动网络系统。根据质量守恒、动量守恒和能量守恒定律,建立了600 MW超临界锅炉螺旋水冷壁流量和壁温计算的数学模型。采用拟牛顿法对流量回路和节点方程组求解,并开发计算程序,获得了不同负荷下螺旋水冷壁内流动压降、流量分配及壁温特性。结果表明:在100%BMCR(锅炉最大连续蒸发量)、75%BMCR及30%BMCR负荷下,热偏差和流量偏差较小,热偏差最大为5℃,流量偏差最大为7.47%;流动压降与设计值符合较好;水冷壁壁温随炉膛高度增加而升高,最高壁温为469.4℃,各负荷下管壁温度均处在管材强度的允许范围内。Based on the fluid piping network calculation theory,established was a 600 MW supercritical boiler spirally-coiled tube water wall flow network system composed of flow rate loops,pressure nodes and connection pipes. According to the law of mass,momentum and energy conservation,a mathematical model for calculating the flow rate and wall temperature of spirally-coiled tube water walls of 600 MW supercritical boilers. The quasi-Newton method was used to seek solutions to the flow rate loop and node equation group and a calculation program was developed to obtain the flow pressure drop,flow rate distribution and wall temperature characteristics inside a spirally-coiled tube water wall at various loads. It has been found that at a load of 100%,75% and 30% BMCR( boiler maximum continuous rating),both thermal and flow rate deviation are relatively small,the thermal deviation being maximally 5 ℃ and the flow rate deviation being maximally 7. 47%. The flow pressure drop is in relatively good agreement with the design value. The wall temperature of the water wall will increase with an increase of the height,the highest wall temperature being 469. 4 ℃. The tube wall temperatures at various loads are invariably below the allowable temperature for the tube material.

关 键 词：超临界锅炉 流动网络系统 螺旋水冷壁 流量分配 壁温 

分 类 号：TK223.31[动力工程及工程热物理—动力机械及工程]