700℃实炉验证试验平台过热试件热流密度测量及壁温分布研究  

Study on Heat Flux Measurement and Wall Temperature Distribution of Superheated Specimen in 700℃ Coal-Fired Power Generation Component Test Facility

作　　者：钟犁 肖平[3] 朱忠亮 李小敏 张兴豪 刘卫国 徐鸿[1] ZHONG Li;XIAO Ping;ZHU Zhongliang;LI Xiaomin;ZHANG Xinghao;LIU Weiguo;XU Hong(School of Energy Power and Mechanical Engineering,North China Electric Power University,Beijing 102209,China;Beijing Huaneng Yangtze Environmental Technology Research Institute Co.,Ltd.,Beijing 102209,China;Clean Energy Research Institute of China Huaneng Group,Beijing 102209,China;Nanjing Power Plant,Huaneng Power International Jiangsu Energy Development Co.,Ltd.,Nanjing 210035,China)

机构地区：[1]华北电力大学能源动力与机械工程学院,北京102209 [2]北京华能长江环保科技研究院有限公司,北京102209 [3]中国华能集团清洁能源技术研究院有限公司,北京102209 [4]华能国际电力江苏能源开发有限公司南京电厂,江苏南京210035

出　　处：《锅炉技术》2024年第3期1-9,共9页Boiler Technology

基　　金：国家重点研发计划(2018YFB0604401)。

摘　　要：随着锅炉主蒸汽参数的提高,炉内受热面壁温的监测对于安全运行日益重要,并且有利于根据壁温分布进行选材,降低造价。南京电厂700℃验证试验平台炉内过热试件分布着12个牌号的材料,掌握锅炉管壁温分布及其随负荷变化的规律,是准确分析材料验证情况的基础。采用火焰强度热流计对炉内热流密度的空间分布进行实际测量,结合受热面进出口蒸汽参数的实际测量结果,对炉内壁温分布进行计算,结果表明:过热试件不同方向的热流密度在15~180kW/m^(2)范围内,并呈现明显的规律性,其中收到来自前方的热流密度最大、下方的热流密度其次,并且屏底热流密度最高、炉顶位置热流密度最低,屏底水平管平均热流密度约为垂直管的1.3倍。根据热流密度空间分布测量结果计算的过热试件壁温沿着蒸汽流程方向快速增加,在屏底位置出现一个小的峰值,然后增速放缓、最后在靠近管屏出口处略有下降;而管壁和蒸汽温差呈现先增加后减少、并在屏底出现明显峰值的现象,最外侧管屏底最大温差达到约88℃,屏顶温差则降低到约25℃。锅炉负荷越高,热流密度越大,同时壁温沿程增长速率越高。炉内壁温测量元件与壁温计算结果的最大温度偏差小于2%,两者具有良好的一致性。根据壁温计算结果对过热试件进行选材,约有51.2%的锅炉管须采用镍基合金材料,相比全部采用镍基合金材料可大幅降低成本。With the increase of main steam parameters of boilers,monitoring the wall temperature distribution of heating surface in the furnace is becoming increasingly important for safe operation,and beneficial for material selection to reduce costs.In the 700℃ component test facility at Nanjing Power Plant there are 12 different materials distributed throughout its superheater,and understanding wall temperature distribution and its variation with load is the basis for accurately analyzing material validation results.The flame intensity heat flux meter is used to measure the spatial distribution of heat flux density inside the furnace,and combined with actual measurements of steam parameters at inlet and outlet of superheater,the wall temperature distribution is calculated.The results show that heat flux density in different directions ranges from 15 kW/m^(2)to 180 kW/m^(2),and indicate obvious regularity.The heat flux density from ahead direction is the maximum,followed by the heat flux density from below,while the density at the panel bottom is the highest and that at top position is the lowest,and the horizontal tube's average thermal flow density at the panel bottom is about l.3 times of that of vertical tube.Along steam flow direction,there is a rapid increase in superheater wall temperatures which peaks near panel bottom,then slowing down and finally decreasing slightly near the outlet.The tube wall-to-steam temperature difference shows a phenomenon of first increasing and then decreasing,and a significant peak at the panel bottom,and is the maximum value of 88℃ at the panel bottom,while drops to around 25℃ at the panel top.Higher boiler loads result in higher thermal flow densities as well as faster increases in wall temperatures.The maximum deviation between measurements and the calculations results is less than 2%which indicates good consistency.According to the calculation results,for the superheated specimen,about 51.2% of tubes require nickel-based alloys,which can significantly reduce cost compared to u

关 键 词：700℃验证试验平台 过热试件 高温材料 炉内壁温分布 热流密度 

分 类 号：TK224.1[动力工程及工程热物理—动力机械及工程]