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Domains of Flammability and Thermal Ignitability for Pulverized Coals and Other Dusts: Particle Size Dependences and Microscopic Residue Analyses.

Hertzberg-M; Cashdollar-KL; Ng-DL; Conti-RS
Paper in 19th Symp Int'l on Combustion Haifa Israel 1982 Aug; :1169-1180
New data presented for the particle size dependence of the domains of flammability and thermal ignitability for two bituminous coal dusts and for polyethylene powder showed that below some threshold or characteristic diameter, the behavior of all the dusts was independent of particle size and approached that of an equivalent premixed gas. Above the characteristic diameter, the lean limit of flammability and the minimum autoignition temperature increased with increasing particle size. For still larger particle sizes, a critical diameter was reached, above which the dusts were nonexplosive at ambient temperature. Both the characteristic diameter at which a size dependence first appears and the critical diameter above which the dust is nonexplosive increase monotonically with increasing volatility of the dust. The characteristic diameter and critical diameter also increase monotonically with increasing ambient temperature and with increasing oxygen content of the dispersing gas.
Publication Date
Document Type
OP; Conference/Symposia Proceeding;
Fiscal Year
NTIS Accession No.
NTIS Price
Identifying No.
OP 46-83
NIOSH Division
Source Name
Paper in 19th Symp. Int'l. on Combustion, Haifa, Israel, Aug. 8-13, 1982, PP. 1169-1180