Next Article in Journal
Hardware-in-the-Loop Simulation of Distributed Intelligent Energy Management System for Microgrids
Next Article in Special Issue
A Dynamic Model for the Normal Impact of Fly Ash Particle with a Planar Surface
Previous Article in Journal
Experimental Research and Control Strategy of Pumped Storage Units Dispatching in the Taiwan Power System Considering Transmission Line Limits
Previous Article in Special Issue
Evaluation of Structural Changes in the Coal Specimen Heating Process and UCG Model Experiments for Developing Efficient UCG Systems
Energies 2013, 6(7), 3245-3262; doi:10.3390/en6073245
Article

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

, * ,
 and
Received: 23 April 2013; in revised form: 25 June 2013 / Accepted: 27 June 2013 / Published: 3 July 2013
(This article belongs to the Special Issue Coal Combustion and Gasification)
Download PDF [1527 KB, uploaded 3 July 2013]
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 (dp) 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 dp−5/6 and therefore becomes larger for smaller particles. For instance, in the present work, the velocity vc 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.
Keywords: ash deposition; rebound characteristics; impaction experiments; normal restitution coefficient ash deposition; rebound characteristics; impaction experiments; normal restitution coefficient
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Export to BibTeX |
EndNote


MDPI and ACS Style

Dong, M.; Li, S.; Xie, J.; Han, J. Experimental Studies on the Normal Impact of Fly Ash Particles with Planar Surfaces. Energies 2013, 6, 3245-3262.

AMA Style

Dong M, Li S, Xie J, Han J. Experimental Studies on the Normal Impact of Fly Ash Particles with Planar Surfaces. Energies. 2013; 6(7):3245-3262.

Chicago/Turabian Style

Dong, Ming; Li, Sufen; Xie, Jun; Han, Jian. 2013. "Experimental Studies on the Normal Impact of Fly Ash Particles with Planar Surfaces." Energies 6, no. 7: 3245-3262.


Energies EISSN 1996-1073 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert