Model for coal dust duct explosions

Journal Article · Fri Jan 01 00:00:00 EST 1982 · Combust. Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(82)90070-0· OSTI ID:5443050

Pickles, J H

A theoretical discussion is given of the propagation of a dust explosion in a linear duct or pipeline. The particular aim is to investigate the experimental observation that propagating explosions are much harder to initiate in small laboratory scale ducts than in, say, coal mine galleries. A model is proposed in which a turbulent mixing phenomenon first identified by G.I. Taylor gives, for large ducts, very high flame velocities, which in turn lead to large fluid velocities and further increases in flame velocity. In small ducts, the time scale of the turbulent mixing is less than the time needed for the burning of individual coal particles. The particle burning time becomes an additional constraint on the rate of flame propagation and the development of explosions is inhibited.

• OSTI ID: 5443050
• Journal Information: Combust. Flame; (United States), Vol. 44:1/3
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
DUSTS
EXPLOSIONS
MATHEMATICAL MODELS
BENCH-SCALE EXPERIMENTS
COAL
COAL MINES
COMBUSTION
DUCTS
FLAME PROPAGATION
FLAMES
PARTICLES
PIPES
TURBULENT FLOW
UNDERGROUND MINING
VELOCITY
CARBONACEOUS MATERIALS
CHEMICAL REACTIONS
ENERGY SOURCES
FLUID FLOW
FOSSIL FUELS
FUELS
MATERIALS
MINES
MINING
OXIDATION
THERMOCHEMICAL PROCESSES
UNDERGROUND FACILITIES
012000* - Coal
Lignite
& Peat- Mining