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The impact of ash pellet characteristics and pellet processing parameters on ash fusion behaviour

Daley, Patrick; Williams, Orla; Pang, Cheng Heng; Wu, Tao; Lester, Edward

Authors

Patrick Daley

Cheng Heng Pang

Tao Wu



Abstract

The Ash Fusion Test (AFT) is considered to be the most popular method of characterising the melt characteristics of solid fuel ash. This study shows how pellet preparation can make significant improvements to repeatability. Pelleting pressure, pellet particle size, pellet shape, and furnace ramp rate were investigated to establish the most repeatable representation of ash melting relevant to pulverised fuel combustion in a furnace in an oxidizing atmosphere up to 1600 °C. A 5 mm machine pressed pellet was found to produce the best results as it identified the earliest initial deformation temperature (IDT), gave the least error, and displayed the greatest visible change in pellet height to enable easy identification. Reducing maximum ash particle size to less than 72 µm and increasing the pressure of the pelleting process was also shown to produce a 120 ⁰C reduction in the IDT when compared with other methods. Reducing the ashing temperature and retaining volatiles lost during high temperature ashing were shown to have a negligible impact on IDT. The characteristic AFT curve was also used to quantify the extent of shrinkage and swelling during the test.

Citation

Daley, P., Williams, O., Pang, C. H., Wu, T., & Lester, E. (2019). The impact of ash pellet characteristics and pellet processing parameters on ash fusion behaviour. Fuel, 251, 779-788. https://doi.org/10.1016/j.fuel.2019.03.142

Journal Article Type Article
Acceptance Date Mar 27, 2019
Online Publication Date Apr 28, 2019
Publication Date Sep 1, 2019
Deposit Date Apr 12, 2019
Publicly Available Date Mar 28, 2024
Journal Fuel
Print ISSN 0016-2361
Electronic ISSN 1873-7153
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 251
Pages 779-788
DOI https://doi.org/10.1016/j.fuel.2019.03.142
Keywords Coal, Biomass, Advanced ash fusion test, Ash, Pellet preparation, Initial deformation
Public URL https://nottingham-repository.worktribe.com/output/1782084
Publisher URL https://www.sciencedirect.com/science/article/pii/S0016236119305265
Additional Information This article is maintained by: Elsevier; Article Title: The impact of ash pellet characteristics and pellet processing parameters on ash fusion behaviour; Journal Title: Fuel; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.fuel.2019.03.142; Content Type: article; Copyright: © 2019 The Authors. Published by Elsevier Ltd.