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

Ming Dong, Sufen Li, Jun Xie and Jian Han
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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

Energies, 2013, vol. 6, issue 7, 1-18

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 ?m is 0.19 m/s, which increases to 0.42 m/s for particles with a diameter of 65 ?m.

Keywords: ash deposition; rebound characteristics; impaction experiments; normal restitution coefficient (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2013
References: View complete reference list from CitEc
Citations: View citations in EconPapers (7)

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