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Experimental Studies on the Normal Impact of Fly Ash Particles with Planar Surfaces

Author

Listed:
  • Ming Dong

    (School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China)

  • Sufen Li

    (School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China)

  • Jun Xie

    (School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China)

  • Jian Han

    (School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China)

Abstract

This paper presents the results of a comprehensive program of experiments in which fly ash particles were impacted under controlled conditions against a flat steel surface. The overall aim of these experiments was to gain an understanding of the ash deposition process in a pulverized coal boiler system. A continuous nitrogen flow carrying fly ash particles was used to examine the effect of particle incident velocity and particle diameter ( d p ) on the normal restitution coefficient, and of the particle diameter on the critical velocity. The effect of the incident normal velocity and particle diameter on the normal restitution coefficient was also examined. The results show that the normal restitution coefficient increases rapidly with increasing incident velocity when this incident velocity is less than the yield velocity, and rapidly decreases with increasing incident velocity when the incident velocity is greater than the yield velocity. The critical velocity, determined solely by the first-contact energy loss, is proportional to d p −5/6 and therefore becomes larger for smaller particles. For instance, in the present work, the velocity v c of a particle with diameter of 85 μm is 0.19 m/s, which increases to 0.42 m/s for particles with a diameter of 65 μm.

Suggested Citation

  • Ming Dong & Sufen Li & Jun Xie & Jian Han, 2013. "Experimental Studies on the Normal Impact of Fly Ash Particles with Planar Surfaces," Energies, MDPI, vol. 6(7), pages 1-18, July.
  • Handle: RePEc:gam:jeners:v:6:y:2013:i:7:p:3245-3262:d:26875
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    Citations

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    Cited by:

    1. Ali Cemal Benim & Cansu Deniz Canal & Yakup Erhan Boke, 2021. "A Validation Study for RANS Based Modelling of Swirling Pulverized Fuel Flames," Energies, MDPI, vol. 14(21), pages 1-33, November.
    2. Ming Dong & Jun Xie & Linying Bai & Sufen Li, 2014. "An Experimental Investigation on the Influence of Temperature on the Normal Impact of Fine Particles with a Plane Surface," Energies, MDPI, vol. 7(4), pages 1-16, March.
    3. Cai, Yongtie & Tay, Kunlin & Zheng, Zhimin & Yang, Wenming & Wang, Hui & Zeng, Guang & Li, Zhiwang & Keng Boon, Siah & Subbaiah, Prabakaran, 2018. "Modeling of ash formation and deposition processes in coal and biomass fired boilers: A comprehensive review," Applied Energy, Elsevier, vol. 230(C), pages 1447-1544.
    4. Yuanhao Shi & Qiang Li & Jie Wen & Fangshu Cui & Xiaoqiong Pang & Jianfang Jia & Jianchao Zeng & Jingcheng Wang, 2019. "Soot Blowing Optimization for Frequency in Economizers to Improve Boiler Performance in Coal-Fired Power Plant," Energies, MDPI, vol. 12(15), pages 1-19, July.
    5. Yuanhao Shi & Jie Wen & Fangshu Cui & Jingcheng Wang, 2019. "An Optimization Study on Soot-Blowing of Air Preheaters in Coal-Fired Power Plant Boilers," Energies, MDPI, vol. 12(5), pages 1-15, March.
    6. Jun Xie & Haodong Ma & Chenxi Li & Shaobai Li & Zhengren Zhu & Zheng Fu, 2021. "The Critical Capture Velocity of Coal Ash Particles Oblique Impact on a Stainless Steel Surface," Energies, MDPI, vol. 14(17), pages 1-17, August.
    7. Shuiguang Tong & Xiang Zhang & Zheming Tong & Yanling Wu & Ning Tang & Wei Zhong, 2019. "Online Ash Fouling Prediction for Boiler Heating Surfaces based on Wavelet Analysis and Support Vector Regression," Energies, MDPI, vol. 13(1), pages 1-20, December.

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