Scholarly record
RESEARCH ON THE CHARACTERIZATION OF DANGEROUS SUBSTANCES FROM A FLAMEWORK POINT BY DETERMINING THE SELF-IGNITION TEMPERATURE OF THE DUST ACCUMULATIONS
Abstract
Spontaneous combustion is a phenomenon that results from the heating of combustible organic powders by slow oxidation and which occurs through the air passage (created by an air depression) through the mass of dust. The oxidation phenomenon of combustible powders represents their reaction with atmospheric oxygen resulting in products of carbon dioxide, carbon oxide, water and other gases whose content depends on the temperature at which the oxidation takes place. During oxidation, the oxidation rate is a function of temperature and can increase twice by heating the coal with 10°C. The speed of temperature rise depends on the speed of heat dissipation. As the temperature increases, the rate of oxidation increases, which produces more heat and the process accelerates. The self-ignition of combustible dusts depends on their chemical composition, the properties of component substances, on the particle size and geometry of the material mass and, last but not least, on the temperature of the environment. Self-ignition is a complex process that takes place in three successive or simultaneous stages of development. These influence each other and are: self-heating, evaporation of humidity and self-ignition. The reason behind self-heating (or possibly self-ignition) is that the molecules on the surface of combustible dust particles are subjected to exothermic reactions with oxygen in the air transported in the free volume between particles, even at normal temperatures. Any amount of heat released will then cause an increase in temperature in the reactive-air dust system, thus accelerating the reaction of other dust molecules with oxygen.The purpose of this work is to describe / present the self-ignition behaviour of combustible dusts by volume by means of drying tests under constant temperature conditions.
Publication Impact Profile
- Captures
- Mendeley - Readers: 1
Publication details
References9
Center for Chemical Process Safety (CCPS), Guidelines for Safe handling of Powders and Bulk Solids, AIChE/CCPS, New York, 2005
Eckhoff, Rolff, Dust Explosions in the Process Industries, 3rd Ed. Gulf Professional Publishing, Houston, TX, 2003
Investigation Report: Combustible dust hazard study, Report no. 2006-H-1,2006
OSHA, Hazard Alert: Combustible Dust Explosion, 2014
OSHA, Hazard Communication Guidance for Combustible Dusts, 2009
SR EN 15188:2008 Determination of the spontaneous ignition behaviour of dust accumulations
Nucleu Project PN 19 21 01 03 Development of laboratory analysis methods for the characterization of hazardous substances involved in fire / explosion events in order to increase the capacity of technical expertise
https://www.grainger.com/know-how/safety/emergency-response/combustible-dust/kh-combustible-dust-hazards
https://www.aidic.it/cet/16/48/075.pdf
View or Download full articleAccess options
SWS access login
Login as SWS Scientific CommitteeLogin as SWS Scientific PartnerLogin as SWS AuthorAuthors and approved SWS contributors will read and export their own linked papers after identity matching by SWS profile, email and SGEM GlobalID.
For librarian assistance: [email protected]
Purchase Instant Access
- Article can be downloaded after successful payment.
- Article may be used according to SWS library access terms.
- Article cannot be redistributed.