固体燃料灰渣高温受热面黏附特性定量研究  

Quantitative Measurement of the Sticking Probability of Solid-Fuel-Generated Ash Particles at Elevated Temperature

作　　者：杨远平 黄骞 占宇钘 李水清[1] YANG Yuanping;HUANG Qian;ZHAN Yuxing;LI Shuiqing(Department of Energy and Power Engineering,Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Tsinghua University,Beijing 100084,China;School of Mechanical Engineering,Beijing Institute of Petrochemical Technology,Beijing 102617,China)

机构地区：[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]北京石油化工学院机械工程学院,北京102617

出　　处：《工程热物理学报》2023年第1期244-249,共6页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(No.51906122);国家自然科学基金委杰出青年项目(No.51725601)。

摘　　要：锅炉受热面积灰结渣严重影响锅炉清洁高效运行。本文采用一种基于多元扩散平焰燃烧器的灰渣颗粒高温黏附概率定量测量系统,研究不同温度下多种固体燃料(低阶煤掺烧高岭土、生物质、煤掺烧固废)灰渣颗粒的组分、热稳定性及熔融特性,获得了灰渣颗粒黏附概率随温度的变化关系。结果表明,高硅铝含量的准东煤掺烧高岭土渣和生物质渣黏附概率随颗粒温度的升高逐渐增大;高钙含量的煤掺烧污泥渣黏附概率在1150℃时发生跃升。此外,现有基于灰渣熔融液相比和黏度的黏附概率模型计算结果与实验结果偏差较大,难以对各类灰渣高温黏附特性进行准确评估和预测。本研究所提供的实验方法及测量结果可为进一步发展灰渣高温黏附概率模型提供基础。Ash deposition causes serious problems for the operation of solid fuel-fired boilers.In this paper,we measured the sticking probability of ash particles at elevated temperatures based on a diffusive flat-flame burner.The compositions,weight losses,melting behaviors and the sticking probabilities as functions of the temperature were investigated for ash particles from the combustion of various solid fuels(low-rank coal+kaoline,biomass,co-firing coal with sludge).It was shown that the slags produced by Zhundong coal with kaoline additives and biomass are rich in silicon and aluminum,and the sticking probabilities gradually increase with the temperature;By contrast,the slag produced by cofiring coal with sludge is rich in calcium,and a sharp increase of the sticking probability is observed when the temperature rises above 1150℃.In addition,existing model predictions of sticking probability,based on either melt fraction or viscosity,deviate greatly from the experimental results,and thus cannot be used for practical purposes.The experimental methods and measurement results in this study are beneficial for future work on ash sticking probability models at elevated temperatures.

关 键 词：积灰结渣 黏附概率 固体燃料 平焰燃烧器 熔融比例 

分 类 号：TK123[动力工程及工程热物理—工程热物理]