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Work-principle model for predicting toxic fumes of nonideal explosives.

Authors
Wieland-MS
Source
Propellants Explos Pyrotech 2004 Aug; 29(4):236-243
NIOSHTIC No.
20025499
Abstract
The work-principle from thermodynamics was used to formulate a model for predicting toxic fumes from mining explosives in underground chamber tests, where rapid turbulent combustion within the surrounding air noticeably changes the resulting concentrations. Two model constants were required to help characterize the reaction zone undergoing rapid chemical transformations in conjunction with heat transfer and work output: a stoichiometry mixing fraction and a reaction-quenching temperature. Rudimentary theory with an unsteady uniform concentration gradient was taken to characterize the combustion zone, yielding 75% for the mixing fraction. Four quenching temperature trends were resolved and compared to test results of ammonium nitrate compositions with different fuel-oil percentages (ANFO). The quenching temperature 2,345 K was the optimum choice for fitting the two major components of fume toxicity: carbon monoxide and total nitrogen oxides. The resulting two-constant model was used to generate comparisons for test results of ANFO compositions with additives. Although respectable fits were usually found, charge formulations that reacted weakly could not be resolved numerically. The work-principle model yields toxic concentrations for a range of charge formulations, making it a useful tool for investigating the potential hazard of released fumes and reducing the risk of unwanted incidents.
Keywords
Toxicity; Fumes; Explosives; Models; Mining-industry; Health-hazards; Toxic-gases; Toxic-vapors
Contact
NIOSH Pittsburgh Research Laboratory, P.O. Box 18070, Pittsburgh, PA 15236
CODEN
PEPYD5
CAS No.
630-08-0; 118-96-7; 10102-44-0; 10102-43-9; 10102-44-0; 6484-52-2
Publication Date
20040801
Document Type
Journal Article
Fiscal Year
2004
NTIS Accession No.
NTIS Price
Issue of Publication
4
ISSN
0721-3115
NIOSH Division
PRL
Source Name
Propellants Explosives Pyrotechnics
State
PA
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