Inhibition of coal dust--air flames

Technical Report · Sun Aug 01 04:00:00 EDT 1971

OSTI ID:5417262

Grumer, J; Bruszak, A E

Nine dust and gaseous inhibitors of propagating coal dust-air flames (lean, stoichiometric, and rich) were evaluated in a newly developed 15-cm-id, 3.6-meter long instrumented flame duct, under conditions such that wall quenching was virtually absent and the dust concentration was temporally and spacially uniform to within about +- 5 percent. Listed roughly in order of increasing efficiency, the inhibitors evaluated were rock dust (calcium carbonate), powdered oyster shells (calcium carbonate), Halon 1301 (trifluorobromomethane), Halon 1211 (difluorochlorobromethane), sodium chloride, Super-K (potassium chloride), regular-grade fire extinguishant powder (sodium bicarbonate), Purple-K (potassium bicarbonate), and Monnex (potassium bicarbonate combined with urea). Experiments were extended to clouds containing 1 and 2 volume-percent of methane. The inhibition of lean, stoichiometric, and rich methane-air flames without coal dust was also examined in a few instances; results agreed with those obtained for coal dust-air flames.

• Research Organization: Bureau of Mines, Washington, D.C. (USA)
• OSTI ID: 5417262
• Report Number(s): BM-RI-7552
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
016000* -- Coal
Lignite
& Peat-- Health & Safety
090110 -- Hydrocarbon Fuels-- Properties-- (1979-1989)
10 SYNTHETIC FUELS
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ALKANES
AMIDES
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CARBONATES
CARBONIC ACID DERIVATIVES
CHLORIDES
CHLORINE COMPOUNDS
COAL
COAL FINES
CRYOGENIC FLUIDS
DUSTS
ENERGY SOURCES
FLAMES
FLUIDS
FLUORINATED ALIPHATIC HYDROCARBONS
FOSSIL FUELS
FUELS
HALIDES
HALOGEN COMPOUNDS
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROCARBONS
INHIBITION
METHANE
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
POTASSIUM CHLORIDES
POTASSIUM COMPOUNDS
ROCK DUSTING
SODIUM CARBONATES
SODIUM CHLORIDES
SODIUM COMPOUNDS
UREA