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The Critical Capture Velocity of Coal Ash Particles Oblique Impact on a Stainless Steel Surface

Author

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  • Jun Xie

    (School of Energy and Environment, Shenyang Aerospace University, Shenyang 110136, China)

  • Haodong Ma

    (School of Energy and Environment, Shenyang Aerospace University, Shenyang 110136, China)

  • Chenxi Li

    (School of Energy and Environment, Shenyang Aerospace University, Shenyang 110136, China)

  • Shaobai Li

    (School of Energy and Environment, Shenyang Aerospace University, Shenyang 110136, China)

  • Zhengren Zhu

    (School of Energy and Environment, Shenyang Aerospace University, Shenyang 110136, China)

  • Zheng Fu

    (SPIC Northeast Electric Power Development Company Limited, Shenyang 110181, China)

Abstract

In this paper, the rebound characteristics of coal ash particles impacting on a stainless steel surface are studied experimentally with the background of ash deposition on the heating surface of the boiler. The impact processes of coal ash particles with different incident angles were recorded by high-speed digital camera technology. The evolution of the normal restitution coefficient with incident normal velocity was obtained. Three different static contact theories are used to establish the equations of motion to predict the critical capture velocity of particles. The results show that the normal restitution coefficient first increases and then decreases with the increase of incident normal velocity. The critical capture velocity of particles under the three models was predicted. It is found that the prediction results of the Brach and Dunn (BD) model for the critical capture velocity are close to the experimental results. Taking the particle of size 23 μm as an example, the maximum critical capture velocity predicted by BD model is 1.0611 m/s at 0° incident angle. The minimum value is 0.7940 m/s when the incident angle is 45°.The critical capture velocity of particles decreases with the increase of incident angle and with the increase of particle diameter.

Suggested Citation

  • 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.
  • Handle: RePEc:gam:jeners:v:14:y:2021:i:17:p:5231-:d:620584
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    References listed on IDEAS

    as
    1. 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.
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