NDLI: Effect of Weathering of Coal and Organic Dusts on Their Spontaneous Ignition

Content Provider	Springer Nature Link
Author	Joshi, Kulbhushan Raghavan, V. Rangwala, Ali S.
Copyright Year	2012
Abstract	Weathering of coal and other cellulosic dusts occur due to the process of wetting and subsequent drying, or by subjecting them to a temperature higher than the ambient temperature for prolonged time periods. The first type of weathering occurs in a wetted storage. The second type of weathering occurs when a dust processing unit stores and maintains the dust deposit at an elevated temperature. As a result of weathering, the physical and thermal properties of the dust may change. Therefore, the weathered dust sample is expected to ignite at a different hot plate temperature as compared to that of a fresh sample, when tested in a standard test method (ASTM E 2021). In this study, three dust samples namely, wheat flour, Pittsburgh seam coal and powder river basin coal, are tested. These dust samples are subjected to one or both types of weathering. Thermogravimetric analysis and standard ignition tests are carried out with both fresh and weathered dust samples. Estimation of the activation energies and reactivity, and measurement of the minimum surface temperature for the onset of ignition have been carried out for all the cases. The implications of the observed results on industrial safety related to combustible dust layers are discussed.
Starting Page	843
Ending Page	856
Page Count	14
File Format	PDF
ISSN	00152684
Journal	Fire Technology
Volume Number	49
Issue Number	4
e-ISSN	15728099
Language	English
Publisher	Springer US
Publisher Date	2012-09-14
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Spontaneous ignition Weathering Coal Organic dust Activation energy Reactivity Civil Engineering Mechanics Characterization and Evaluation of Materials Physics
Content Type	Text
Resource Type	Article
Subject	Materials Science Safety, Risk, Reliability and Quality

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