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Simulating growth of ash deposit in boiler heat exchanger tube based on CFD dynamic mesh technique

机译：基于CFD动态网格技术模拟锅炉换热器内灰渣的生长。

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摘要

Ash deposition on heat transfer surfaces is still a significant problem in existing conventional utility boilers. Understanding the formation of ash deposit is thereby very important, which is helpful to optimize the design and operation procedure of boilers. In this study, a dynamic numerical method based on the commercial software ANSYS FLUENT was developed to predict the growth of ash deposit on the deposition probe in a 300 kW slagging test furnace fired with Zhundong coal. Based on the CFD dynamic mesh technique, both shape variations and surface temperature variations of ash deposit with time were predicted. Time-dependent deposition behaviors on the deposition probe with different initial metal wall temperatures were presented. The simulation results (e.g. thickness, heat flux, surface temperature, and shape of ash deposit) are in good agreement with the experimental data. It shows that increased surface temperature of ash deposit can significantly increase ash deposition mass. It was also determined that the shape variation of ash deposit can obviously reduce the impact mass and deposition mass during ash deposition by the comparative studies. The developed simulation method is proved to be a useful tool to predict ash deposition behavior with more detailed information.
机译：灰分沉积在传热表面上仍然是现有常规公用锅炉中的重要问题。因此，了解灰烬沉积的形成非常重要，这有助于优化锅炉的设计和操作程序。在这项研究中，开发了一种基于商业软件ANSYS FLUENT的动态数值方法，以预测在准东煤燃烧的300 kW排渣试验炉中，沉积探针上灰分沉积的增长。基于CFD动态网格技术，可以预测灰烬沉积物的形状变化和表面温度随时间的变化。提出了具有不同初始金属壁温度的随时间变化的沉积行为。模拟结果（例如厚度，热通量，表面温度和灰烬沉积形状）与实验数据非常吻合。结果表明，提高灰分沉积的表面温度可以显着增加灰分沉积质量。通过比较研究还确定，灰渣沉积物的形状变化可以明显降低灰渣沉积过程中的冲击质量和沉积质量。事实证明，所开发的模拟方法是预测灰分沉积行为的有用工具，具有更详细的信息。

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  • 来源
    《Fuel》 |2020年第1期|116083.1-116083.16|共16页
  • 作者

    Zheng Zhimin; Yang Wenming; Yu Peng; Cai Yongtie; Zhou Hao; Boon Siah Keng; Subbaiah Prabakaran;

  • 作者单位

    Sembcorp NUS Corp Lab Block E1A 04-01 1 Engn Dr 2 Singapore 117576 Singapore|Natl Univ Singapore Dept Mech Engn Block EA 07-08 9 Engn Dr Singapore 117575 Singapore;

    Southern Univ Sci & Technol Dept Mech & Aerosp Engn Shenzhen 518055 Peoples R China;

    Zhejiang Univ Inst Thermal Power Engn State Key Lab Clean Energy Utilizat Hangzhou 310027 Zhejiang Peoples R China;

    Sembcorp Ind Ltd 30 Hill St 05-04 Singapore 179360 Singapore;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Ash deposition; CFD; Zhundong coal; Slagging; Dynamic mesh;

    机译：灰分沉积;差价合约准东煤;结渣;动态网格;

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