基于频域法的超超临界锅炉水冷壁动态特性模型验证及计算分析  

Model Verification and Calculation Analysis of Dynamic Characteristics of Water Wall of Ultra-supercritical Boiler Based on Frequency Domain Method

作　　者：毕凌峰 杜晓成 张西容 李维腾 陈经荣 陈婷钰 杨冬[1] BI Lingfeng;DU Xiaocheng;ZHANG Xirong;LI Weiteng;CHEN Jingrong;CHEN Tingyu;YANG Dong(State Key Laboratory of Multiphase Flow in Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,西安710049

出　　处：《动力工程学报》2023年第12期1557-1566,共10页Journal of Chinese Society of Power Engineering

基　　金：国家重点研发计划资助项目(2022YFB4100303)。

摘　　要：为了研究超超临界锅炉水冷壁出口参数的动态特性,采用频域法建立了超临界压力下的水冷壁系统动态特性计算模型。通过试验验证,计算值与试验测量数据符合较好。对某电厂超超临界锅炉下炉膛水冷壁进行了计算,得到75%热耗率验收工况(THA)负荷下的动态响应特性,研究了热负荷、入口焓、入口质量流量、出口压力阶跃时的动态特性,同时分析了不同压力、入口焓、入口质量流量、热负荷和管段长度对各参数阶跃时出口工质参数动态响应的影响。结果表明:入口焓、入口质量流量和热负荷增大时,扰动造成的响应时间减小,入口压力、管段长度增大时,扰动造成的响应时间增加。In order to study the dynamic characteristics of the water wall outlet parameters of ultra-supercritical boiler,the calculation model of the dynamic characteristics of the water wall system under supercritical pressure was established by using the frequency domain method.The experimental results show that the calculated values are in good agreement with the measured data.The lower furnace water wall of an ultra-supercritical boiler was calculated,and the dynamic characteristics under 75%THA load were obtained.The dynamic characteristics at heat flux,inlet enthalpy,inlet mass flow rate and outlet pressure step were studied.The effects of heat flux,inlet enthalpy,inlet mass flow,and outlet pressure step on the outlet fluid parameters were analyzed separately.Results show that the response time due to disturbance decreases when the inlet enthalpy,inlet mass flow rate,and heat flux increases;the response time due to disturbance increases when the inlet pressure and pipe section length increase.

关 键 词：超超临界压力 水冷壁系统 动态特性 试验验证 计算分析 

分 类 号：TK229.2[动力工程及工程热物理—动力机械及工程]