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清华大学学报(自然科学版)  2019, Vol. 59 Issue (4): 326-330    DOI: 10.16511/j.cnki.qhdxxb.2019.21.001
  热能工程 本期目录 | 过刊浏览 | 高级检索 |
热电偶熔敷埋设法测量CFB锅炉壁温的实验研究
姚禹歌1,2, 吕俊复1,2, 张扬1,2, 陈书洁1,2, 张缦1,2, 杨海瑞1,2
1. 清华大学 能源与动力工程系, 热科学与动力工程教育部重点实验室, 北京 100084;
2. 清华大学 能源与动力工程系, 电力系统及发电设备控制和仿真国家重点实验室, 北京 100084
Experimental study of tube-wall temperature measurements in CFB boilers by embedding thermocouples using deposited metal
YAO Yuge1,2, LÜ Junfu1,2, ZHANG Yang1,2, CHEN Shujie1,2, ZHANG Man1,2, YANG Hairui1,2
1. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China;(;
2. State Key Laboratory of Control and Simulation of Power System and Generation Equipments, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China
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摘要 受热面管壁温度是反映锅炉安全的重要参数。在循环流化床(CFB)锅炉中,由于炉膛和流化床换热器中高浓度固体颗粒物对受热面的剧烈冲刷,故在壁温测量中,传统放置热电偶的方法不可用。该文提出了一种可以应用于CFB锅炉的受热面壁温测量的方法:热电偶熔敷埋设法,即将热电偶贴壁式放置在待测锅炉受热面壁面上,熔敷金属熔化后敷设在热电偶表面形成熔敷层。通过实验对于所述测温方法进行可行性验证,针对两种不同的熔敷金属形状,比较实际管壁温度和所提出方法的测量值,并给出了实际管壁温度的计算方法。结果表明:在不同工况下,两种熔敷金属形状的测量值与实际管壁温度的偏差分别在±3℃和±7℃之内,该方法可以应用于锅炉受热面壁温的测量。
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关键词 管壁温度热电偶熔敷金属循环流化床锅炉    
Abstract:Heating surface tube-wall temperatures are key parameters for boiler safety. The high solids concentration in circulating fluidized bed (CFB) boilers complicates installation of thermocouples in the furnace or the fluidized bed heat exchanger. This paper describes a method for embedding thermocouples using deposited metal to measure the tube-wall temperatures in CFB boilers. The method was evaluated experimentally with two deposition shapes with the heat transfer between the thermocouple and the tube-wall analyzed to calculate the actual tube-wall temperature without the deposited metal. The results show that the differences between the measured and actual temperatures of the tube-wall without the deposited metal for the two deposition shapes were about ±3℃ and ±7℃ for various working conditions. Thus, this method can be applied to measure tube-wall temperatures in CFB boilers.
Key wordstube-wall temperature    thermocouple    deposited metal    circulating fluidized bed boiler
收稿日期: 2018-09-12      出版日期: 2019-04-09
基金资助:“十三五”国家重点研发计划项目(2016YFB0600204)
通讯作者: 吕俊复,教授,E-mail:lvjf@tsinghua.edu.cn     E-mail: lvjf@tsinghua.edu.cn
引用本文:   
姚禹歌, 吕俊复, 张扬, 陈书洁, 张缦, 杨海瑞. 热电偶熔敷埋设法测量CFB锅炉壁温的实验研究[J]. 清华大学学报(自然科学版), 2019, 59(4): 326-330.
YAO Yuge, LÜ Junfu, ZHANG Yang, CHEN Shujie, ZHANG Man, YANG Hairui. Experimental study of tube-wall temperature measurements in CFB boilers by embedding thermocouples using deposited metal. Journal of Tsinghua University(Science and Technology), 2019, 59(4): 326-330.
链接本文:  
http://jst.tsinghuajournals.com/CN/10.16511/j.cnki.qhdxxb.2019.21.001  或          http://jst.tsinghuajournals.com/CN/Y2019/V59/I4/326
  图1 两种熔敷形状方案的示意图
  图2 实验系统示意图
  图3 实验系统实物图
  图4 实验管道出风口布置图(以方案 A为例)
  图5 测量点处的传热示意图
  图6 热电偶熔敷埋设法测量值与 实际光管壁温的对比
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